using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Sozsoft.SqlQueryManager.Application.Contracts;
using Sozsoft.SqlQueryManager.Domain.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Volo.Abp.Application.Services;
using Volo.Abp.MultiTenancy;
using System.Text.RegularExpressions;
using Sozsoft.Platform.Enums;
using Sozsoft.Platform.Queries;

namespace Sozsoft.SqlQueryManager.Application;

/// <summary>
/// Executes T-SQL against configured data sources and exposes database metadata.
/// Does not persist SQL objects (queries, procedures, views, functions) to its own tables.
/// </summary>
[Authorize("App.SqlQueryManager")]
public class SqlObjectManagerAppService : ApplicationService, ISqlObjectManagerAppService
{
    private const string QueryExecutedSuccessfullyMessage = "Query executed successfully.";
    private const string QueryExecutedAndDeployedMessage = "Query executed and deployed successfully";

    private const string SqlIdentifierPattern = @"(?:\[[^\]]+\]|\""[^\""\r\n]+\""|[A-Za-z_][A-Za-z0-9_@$#]*)";
    private const string MultiPartSqlIdentifierPattern = SqlIdentifierPattern + @"(?:\s*\.\s*" + SqlIdentifierPattern + @"){0,2}";

    private static readonly Regex SqlObjectDefinitionRegex = new(
        @"^\s*(?:(?:--[^\r\n]*|/\*[\s\S]*?\*/)\s*)*(?<verb>CREATE|ALTER)\s+(?:OR\s+ALTER\s+)?(?<type>VIEW|PROC(?:EDURE)?|FUNCTION)\s+(?<name>" + MultiPartSqlIdentifierPattern + @")",
        RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.Compiled);

    private static readonly Regex SqlObjectDropRegex = new(
        @"^\s*(?:(?:--[^\r\n]*|/\*[\s\S]*?\*/)\s*)*DROP\s+(?<type>VIEW|PROC(?:EDURE)?|FUNCTION)\s+(?:IF\s+EXISTS\s+)?(?<names>" + MultiPartSqlIdentifierPattern + @"(?:\s*,\s*" + MultiPartSqlIdentifierPattern + @")*)",
        RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.Compiled);

    private static readonly Regex SqlObjectHeaderCanonicalizeRegex = new(
        @"^(?<prefix>\s*(?:(?:--[^\r\n]*\r?\n|/\*[\s\S]*?\*/)\s*)*)(?<verb>CREATE|ALTER)\s+(?<after>(?:OR\s+ALTER\s+)?(?:VIEW|PROC(?:EDURE)?|FUNCTION)\b)",
        RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.Compiled);

    private readonly ISqlExecutorService _sqlExecutorService;
    private readonly ISqlTemplateProvider _templateProvider;
    private readonly IDataSourceManager _dataSourceManager;
    private readonly ICurrentTenant _currentTenant;
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly IHostEnvironment _hostEnvironment;
    private readonly ILogger<SqlObjectManagerAppService> _logger;

    public SqlObjectManagerAppService(
        ISqlExecutorService sqlExecutorService,
        ISqlTemplateProvider templateProvider,
        IDataSourceManager dataSourceManager,
        ICurrentTenant currentTenant,
        IHttpContextAccessor httpContextAccessor,
        IHostEnvironment hostEnvironment,
        ILogger<SqlObjectManagerAppService> logger)
    {
        _sqlExecutorService = sqlExecutorService;
        _templateProvider = templateProvider;
        _dataSourceManager = dataSourceManager;
        _currentTenant = currentTenant;
        _httpContextAccessor = httpContextAccessor;
        _hostEnvironment = hostEnvironment;
        _logger = logger;
    }

    private string GetTenantFromHeader()
    {
        return _httpContextAccessor.HttpContext?
            .Request?
            .Headers["__tenant"]
            .FirstOrDefault();
    }

    private void ValidateTenantAccess()
    {
        var headerTenant = GetTenantFromHeader();
        var currentTenantName = _currentTenant.Name;

        if (_currentTenant.IsAvailable)
        {
            if (headerTenant != currentTenantName)
            {
                throw new Volo.Abp.UserFriendlyException($"Tenant mismatch. Header tenant '{headerTenant}' does not match current tenant '{currentTenantName}'.");
            }
        }
    }

    public async Task<SqlObjectExplorerDto> GetAllObjectsAsync(string dataSourceCode)
    {
        ValidateTenantAccess();
        var result = new SqlObjectExplorerDto();
        var dataSourceType = await GetDataSourceTypeAsync(dataSourceCode);

        result.Tables = await GetTablesAsync(dataSourceCode, dataSourceType);
        result.Views = await GetNativeObjectsAsync(dataSourceCode, dataSourceType, "V");
        result.StoredProcedures = await GetNativeObjectsAsync(dataSourceCode, dataSourceType, "P");
        result.Functions = await GetNativeObjectsAsync(dataSourceCode, dataSourceType, "FN", "IF", "TF");

        result.Templates = _templateProvider.GetAvailableQueryTemplates()
            .Select(t => new SqlTemplateDto
            {
                Type = t.Type,
                Name = t.Name,
                Description = t.Description,
                Template = _templateProvider.GetQueryTemplate(t.Type)
            })
            .ToList();

        return result;
    }

    private async Task<DataSourceTypeEnum> GetDataSourceTypeAsync(string dataSourceCode)
    {
        var dataSource = await _dataSourceManager.GetDataSourceAsync(_currentTenant.IsAvailable, dataSourceCode);
        if (dataSource == null)
        {
            throw new Volo.Abp.UserFriendlyException($"Data source '{dataSourceCode}' was not found.");
        }

        return dataSource.DataSourceType;
    }

    private async Task<List<SqlNativeObjectDto>> GetNativeObjectsAsync(
        string dataSourceCode,
        DataSourceTypeEnum dataSourceType,
        params string[] objectTypes)
    {
        var query = dataSourceType == DataSourceTypeEnum.Postgresql
            ? BuildPostgreSqlNativeObjectsQuery(objectTypes)
            : BuildSqlServerNativeObjectsQuery(objectTypes);

        var result = await _sqlExecutorService.ExecuteQueryAsync(query, dataSourceCode);

        var objects = new List<SqlNativeObjectDto>();
        if (result.Success && result.Data != null)
        {
            foreach (var row in result.Data)
            {
                var dict = row as IDictionary<string, object>;
                if (dict != null)
                {
                    objects.Add(new SqlNativeObjectDto
                    {
                        SchemaName = GetDictionaryValue(dict, "SchemaName")?.ToString() ?? GetDefaultSchemaName(dataSourceType),
                        ObjectName = GetDictionaryValue(dict, "ObjectName")?.ToString() ?? "",
                        DataSourceType = dataSourceType.ToString()
                    });
                }
            }
        }

        return objects;
    }

    private static string BuildSqlServerNativeObjectsQuery(params string[] objectTypes)
    {
        var typeList = string.Join(",", objectTypes.Select(t => $"'{t}'"));
        return $@"
            SELECT 
                SCHEMA_NAME(o.schema_id) AS SchemaName,
                o.name AS ObjectName
            FROM 
                sys.objects o
            WHERE 
                o.type IN ({typeList})
                AND o.is_ms_shipped = 0
            ORDER BY 
                SCHEMA_NAME(o.schema_id), o.name";
    }

    private static string BuildPostgreSqlNativeObjectsQuery(params string[] objectTypes)
    {
        var wantsViews = objectTypes.Contains("V");
        var wantsProcedures = objectTypes.Contains("P");
        var wantsFunctions = objectTypes.Any(t => t is "FN" or "IF" or "TF");

        if (wantsViews)
        {
            return @"
                SELECT 
                    table_schema AS ""SchemaName"",
                    table_name AS ""ObjectName""
                FROM information_schema.views
                WHERE table_schema NOT IN ('pg_catalog', 'information_schema')
                ORDER BY table_schema, table_name";
        }

        var proKinds = new List<string>();
        if (wantsProcedures)
        {
            proKinds.Add("'p'");
        }

        if (wantsFunctions)
        {
            proKinds.Add("'f'");
        }

        return $@"
            SELECT 
                n.nspname AS ""SchemaName"",
                p.proname AS ""ObjectName""
            FROM pg_proc p
            INNER JOIN pg_namespace n ON n.oid = p.pronamespace
            WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
              AND p.prokind IN ({string.Join(",", proKinds)})
            ORDER BY n.nspname, p.proname";
    }

    private async Task<List<DatabaseTableDto>> GetTablesAsync(string dataSourceCode, DataSourceTypeEnum dataSourceType)
    {
        var query = dataSourceType == DataSourceTypeEnum.Postgresql
            ? @"
            SELECT 
                table_schema AS ""SchemaName"",
                table_name AS ""TableName""
            FROM information_schema.tables
            WHERE table_type = 'BASE TABLE'
              AND table_schema NOT IN ('pg_catalog', 'information_schema')
            ORDER BY table_schema, table_name"
            : @"
            SELECT 
                SCHEMA_NAME(t.schema_id) AS SchemaName,
                t.name AS TableName
            FROM 
                sys.tables t
            WHERE 
                t.is_ms_shipped = 0
            ORDER BY 
                SCHEMA_NAME(t.schema_id), t.name";

        var result = await _sqlExecutorService.ExecuteQueryAsync(query, dataSourceCode);

        var tables = new List<DatabaseTableDto>();
        if (result.Success && result.Data != null)
        {
            foreach (var row in result.Data)
            {
                var dict = row as IDictionary<string, object>;
                if (dict != null)
                {
                    tables.Add(new DatabaseTableDto
                    {
                        SchemaName = GetDictionaryValue(dict, "SchemaName")?.ToString() ?? GetDefaultSchemaName(dataSourceType),
                        TableName = GetDictionaryValue(dict, "TableName")?.ToString() ?? "",
                        DataSourceType = dataSourceType.ToString()
                    });
                }
            }
        }

        return tables;
    }

    public async Task<SqlQueryExecutionResultDto> ExecuteQueryAsync(ExecuteSqlQueryDto input)
    {
        ValidateTenantAccess();
        var isDeployed = false;

        // Split on GO batch separators (SQL Server SSMS convention — not valid T-SQL)
        var batches = Regex.Split(input.QueryText ?? string.Empty, @"^\s*GO\s*$", RegexOptions.Multiline | RegexOptions.IgnoreCase)
            .Select(b => b.Trim())
            .Where(b => !string.IsNullOrWhiteSpace(b))
            .ToList();

        if (batches.Count <= 1)
        {
            // Single batch — original path
            var result = await _sqlExecutorService.ExecuteQueryAsync(
                input.QueryText,
                input.DataSourceCode,
                input.Parameters);

            if (result.Success)
            {
                isDeployed = TrySyncSqlObjectScriptFile(input.QueryText);
            }

            return MapExecutionResult(result, isDeployed);
        }

        // Multiple batches — execute sequentially, return last meaningful result
        SqlExecutionResult lastResult = null;
        foreach (var batch in batches)
        {
            lastResult = await _sqlExecutorService.ExecuteQueryAsync(
                batch,
                input.DataSourceCode,
                input.Parameters);

            if (!lastResult.Success)
                return MapExecutionResult(lastResult);

            isDeployed |= TrySyncSqlObjectScriptFile(batch);
        }

        return MapExecutionResult(lastResult!, isDeployed);
    }

    public async Task<string> GetNativeObjectDefinitionAsync(string dataSourceCode, string schemaName, string objectName)
    {
        ValidateTenantAccess();
        var dataSourceType = await GetDataSourceTypeAsync(dataSourceCode);
        var result = await _sqlExecutorService.ExecuteQueryAsync(
            BuildNativeObjectDefinitionQuery(dataSourceType, schemaName, objectName),
            dataSourceCode);

        if (result.Success && result.Data != null)
        {
            var dataList = result.Data.ToList();
            if (dataList.Count > 0)
            {
                var row = dataList[0] as IDictionary<string, object>;
                if (row != null)
                {
                    var definition = GetDictionaryValue(row, "Definition")?.ToString() ?? string.Empty;
                    // Always open object script as CREATE OR ALTER in editor.
                    if (dataSourceType == DataSourceTypeEnum.Mssql)
                    {
                        definition = Regex.Replace(
                            definition,
                            @"^\s*(?:CREATE|ALTER)\s+(?:OR\s+ALTER\s+)?",
                            "CREATE OR ALTER ",
                            RegexOptions.IgnoreCase);
                    }
                    return definition;
                }
            }
        }

        return string.Empty;
    }

    private static string BuildNativeObjectDefinitionQuery(
        DataSourceTypeEnum dataSourceType,
        string schemaName,
        string objectName)
    {
        if (dataSourceType == DataSourceTypeEnum.Postgresql)
        {
            var schema = ToSqlLiteral(schemaName);
            var name = ToSqlLiteral(objectName);

            return $@"
                SELECT ""Definition""
                FROM (
                    SELECT pg_get_viewdef(c.oid, true) AS ""Definition""
                    FROM pg_class c
                    INNER JOIN pg_namespace n ON n.oid = c.relnamespace
                    WHERE n.nspname = {schema}
                      AND c.relname = {name}
                      AND c.relkind IN ('v', 'm')

                    UNION ALL

                    SELECT pg_get_functiondef(p.oid) AS ""Definition""
                    FROM pg_proc p
                    INNER JOIN pg_namespace n ON n.oid = p.pronamespace
                    WHERE n.nspname = {schema}
                      AND p.proname = {name}
                      AND p.prokind IN ('f', 'p')
                ) d
                LIMIT 1";
        }

        var fullObjectName = $"[{schemaName.Replace("]", "]]")}].[{objectName.Replace("]", "]]")}]";
        return $@"
            SELECT OBJECT_DEFINITION(OBJECT_ID({ToSqlLiteral(fullObjectName)})) AS Definition";
    }

    public async Task<List<DatabaseColumnDto>> GetTableColumnsAsync(string dataSourceCode, string schemaName, string tableName)
    {
        ValidateTenantAccess();
        var dataSourceType = await GetDataSourceTypeAsync(dataSourceCode);
        var query = dataSourceType == DataSourceTypeEnum.Postgresql
            ? $@"
            SELECT 
                column_name AS ""ColumnName"",
                COALESCE(NULLIF(udt_name, ''), data_type) AS ""DataType"",
                CASE WHEN is_nullable = 'YES' THEN TRUE ELSE FALSE END AS ""IsNullable"",
                character_maximum_length AS ""MaxLength""
            FROM information_schema.columns
            WHERE table_schema = {ToSqlLiteral(schemaName)}
              AND table_name = {ToSqlLiteral(tableName)}
            ORDER BY ordinal_position"
            : $@"
            SELECT 
                c.name AS ColumnName,
                TYPE_NAME(c.user_type_id) AS DataType,
                c.is_nullable AS IsNullable,
                c.max_length AS MaxLength
            FROM 
                sys.columns c
                INNER JOIN sys.tables t ON c.object_id = t.object_id
                INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
            WHERE 
                s.name = {ToSqlLiteral(schemaName)}
                AND t.name = {ToSqlLiteral(tableName)}
            ORDER BY 
                c.column_id";

        var result = await _sqlExecutorService.ExecuteQueryAsync(query, dataSourceCode);

        var columns = new List<DatabaseColumnDto>();
        if (result.Success && result.Data != null)
        {
            foreach (var row in result.Data)
            {
                var dict = row as IDictionary<string, object>;
                if (dict != null)
                {
                    columns.Add(new DatabaseColumnDto
                    {
                        ColumnName = GetDictionaryValue(dict, "ColumnName")?.ToString() ?? "",
                        DataType = GetDictionaryValue(dict, "DataType")?.ToString() ?? "",
                        IsNullable = ToBoolean(GetDictionaryValue(dict, "IsNullable")),
                        MaxLength = ToNullableInt(GetDictionaryValue(dict, "MaxLength"))
                    });
                }
            }
        }

        return columns;
    }

    [HttpGet("api/app/sql-object-manager/table-create-script")]
    public async Task<string> GetTableCreateScriptAsync(string dataSourceCode, string schemaName, string tableName)
    {
        ValidateTenantAccess();
        var dataSourceType = await GetDataSourceTypeAsync(dataSourceCode);

        var result = await _sqlExecutorService.ExecuteQueryAsync(
            BuildTableCreateScriptQuery(dataSourceType, schemaName, tableName),
            dataSourceCode);

        if (!result.Success || result.Data == null)
        {
            return string.Empty;
        }

        var row = result.Data.FirstOrDefault() as IDictionary<string, object>;
        return GetDictionaryValue(row, "Script")?.ToString() ?? string.Empty;
    }

    private static string BuildTableCreateScriptQuery(
        DataSourceTypeEnum dataSourceType,
        string schemaName,
        string tableName)
    {
        if (dataSourceType == DataSourceTypeEnum.Postgresql)
        {
            return BuildPostgreSqlTableCreateScriptQuery(schemaName, tableName);
        }

        return BuildSqlServerTableCreateScriptQuery(schemaName, tableName);
    }

    private static string BuildSqlServerTableCreateScriptQuery(string schemaName, string tableName)
    {
        var fullName = $"[{schemaName.Replace("]", "]]")}].[{tableName.Replace("]", "]]")}]";
        var escapedFullName = ToSqlLiteral(fullName);

        return $@"
DECLARE @ObjectId INT = OBJECT_ID({escapedFullName});

IF @ObjectId IS NULL
BEGIN
    SELECT CAST('' AS NVARCHAR(MAX)) AS Script;
    RETURN;
END;

;WITH cols AS
(
    SELECT
        c.column_id,
        '        ' + QUOTENAME(c.name) + ' ' +
        CASE
            WHEN t.name IN ('varchar', 'char', 'varbinary', 'binary') THEN
                t.name + '(' + CASE WHEN c.max_length = -1 THEN 'MAX' ELSE CAST(c.max_length AS VARCHAR(10)) END + ')'
            WHEN t.name IN ('nvarchar', 'nchar') THEN
                t.name + '(' + CASE WHEN c.max_length = -1 THEN 'MAX' ELSE CAST(c.max_length / 2 AS VARCHAR(10)) END + ')'
            WHEN t.name IN ('decimal', 'numeric') THEN
                t.name + '(' + CAST(c.precision AS VARCHAR(10)) + ',' + CAST(c.scale AS VARCHAR(10)) + ')'
            WHEN t.name IN ('datetime2', 'datetimeoffset', 'time') THEN
                t.name + '(' + CAST(c.scale AS VARCHAR(10)) + ')'
            ELSE t.name
        END +
        CASE
            WHEN ic.object_id IS NOT NULL
                THEN ' IDENTITY(' + CAST(ic.seed_value AS VARCHAR(30)) + ',' + CAST(ic.increment_value AS VARCHAR(30)) + ')'
            ELSE ''
        END +
        CASE WHEN c.is_nullable = 1 THEN ' NULL' ELSE ' NOT NULL' END +
        ISNULL(' DEFAULT ' + dc.definition, '') AS line
    FROM sys.columns c
    INNER JOIN sys.types t ON c.user_type_id = t.user_type_id
    LEFT JOIN sys.identity_columns ic ON c.object_id = ic.object_id AND c.column_id = ic.column_id
    LEFT JOIN sys.default_constraints dc ON c.default_object_id = dc.object_id
    WHERE c.object_id = @ObjectId
),
pk AS
(
    SELECT
        '        CONSTRAINT ' + QUOTENAME(k.name) + ' PRIMARY KEY ' +
        CASE WHEN i.type = 1 THEN 'CLUSTERED' ELSE 'NONCLUSTERED' END +
        CHAR(13) + CHAR(10) + '    (' + CHAR(13) + CHAR(10) +
        (
            SELECT '        ' + QUOTENAME(c.name) + CASE WHEN ic.is_descending_key = 1 THEN ' DESC' ELSE ' ASC' END + CHAR(13) + CHAR(10)
            FROM sys.index_columns ic
            INNER JOIN sys.columns c ON ic.object_id = c.object_id AND ic.column_id = c.column_id
            WHERE ic.object_id = i.object_id
              AND ic.index_id = i.index_id
              AND ic.is_included_column = 0
            ORDER BY ic.key_ordinal
            FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') +
        '    )' AS line
    FROM sys.key_constraints k
    INNER JOIN sys.indexes i ON k.parent_object_id = i.object_id AND k.unique_index_id = i.index_id
    WHERE k.parent_object_id = @ObjectId
      AND k.type = 'PK'
)
SELECT
    'IF OBJECT_ID(N''{fullName.Replace("'", "''")}'', ''U'') IS NULL' + CHAR(13) + CHAR(10) +
    'BEGIN' + CHAR(13) + CHAR(10) +
    '    CREATE TABLE {fullName}' + CHAR(13) + CHAR(10) +
    '    (' + CHAR(13) + CHAR(10) +
    STUFF(
        (
            SELECT ',' + CHAR(13) + CHAR(10) + line
            FROM cols
            ORDER BY column_id
            FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)')
    ,1,3,'') +
    ISNULL(
        (
            SELECT ',' + CHAR(13) + CHAR(10) + line
            FROM pk
        ),
        ''
    ) + CHAR(13) + CHAR(10) + '    )' + CHAR(13) + CHAR(10) + 'END' + CHAR(13) + CHAR(10) + 'GO' AS Script;";
    }

    private static string BuildPostgreSqlTableCreateScriptQuery(string schemaName, string tableName)
    {
        return $@"
WITH cols AS (
    SELECT
        c.ordinal_position,
        '    ' || quote_ident(c.column_name) || ' ' ||
        CASE
            WHEN c.data_type = 'character varying' THEN 'varchar(' || c.character_maximum_length || ')'
            WHEN c.data_type = 'character' THEN 'char(' || c.character_maximum_length || ')'
            WHEN c.data_type = 'numeric' AND c.numeric_precision IS NOT NULL THEN 'numeric(' || c.numeric_precision || ',' || c.numeric_scale || ')'
            WHEN c.data_type = 'USER-DEFINED' THEN c.udt_name
            ELSE c.data_type
        END ||
        CASE WHEN c.is_nullable = 'NO' THEN ' NOT NULL' ELSE '' END ||
        COALESCE(' DEFAULT ' || c.column_default, '') AS line
    FROM information_schema.columns c
    WHERE c.table_schema = {ToSqlLiteral(schemaName)}
      AND c.table_name = {ToSqlLiteral(tableName)}
),
pk AS (
    SELECT
        '    CONSTRAINT ' || quote_ident(tc.constraint_name) || ' PRIMARY KEY (' ||
        string_agg(quote_ident(kcu.column_name), ', ' ORDER BY kcu.ordinal_position) || ')' AS line
    FROM information_schema.table_constraints tc
    JOIN information_schema.key_column_usage kcu
      ON tc.constraint_name = kcu.constraint_name
     AND tc.table_schema = kcu.table_schema
     AND tc.table_name = kcu.table_name
    WHERE tc.constraint_type = 'PRIMARY KEY'
      AND tc.table_schema = {ToSqlLiteral(schemaName)}
      AND tc.table_name = {ToSqlLiteral(tableName)}
    GROUP BY tc.constraint_name
)
SELECT
    'CREATE TABLE IF NOT EXISTS ' || quote_ident({ToSqlLiteral(schemaName)}) || '.' || quote_ident({ToSqlLiteral(tableName)}) || E'\n(\n' ||
    string_agg(line, E',\n' ORDER BY sort_order) ||
    E'\n);' AS ""Script""
FROM (
    SELECT ordinal_position AS sort_order, line FROM cols
    UNION ALL
    SELECT 100000 AS sort_order, line FROM pk
) s;";
    }

    private static object GetDictionaryValue(IDictionary<string, object> row, string key)
    {
        if (row == null)
        {
            return null;
        }

        if (row.TryGetValue(key, out var value))
        {
            return value;
        }

        var match = row.FirstOrDefault(x => string.Equals(x.Key, key, StringComparison.OrdinalIgnoreCase));
        return string.IsNullOrEmpty(match.Key) ? null : match.Value;
    }

    private static string GetDefaultSchemaName(DataSourceTypeEnum dataSourceType)
    {
        return dataSourceType == DataSourceTypeEnum.Postgresql ? "public" : "dbo";
    }

    private static string ToSqlLiteral(string value)
    {
        return $"'{(value ?? string.Empty).Replace("'", "''")}'";
    }

    private static bool ToBoolean(object value)
    {
        return value switch
        {
            bool boolValue => boolValue,
            short shortValue => shortValue != 0,
            int intValue => intValue != 0,
            long longValue => longValue != 0,
            _ => bool.TryParse(value?.ToString(), out var parsed) && parsed
        };
    }

    private static int? ToNullableInt(object value)
    {
        if (value == null)
        {
            return null;
        }

        return int.TryParse(value.ToString(), out var parsed) ? parsed : null;
    }

    private SqlQueryExecutionResultDto MapExecutionResult(SqlExecutionResult result, bool isDeployed = false)
    {
        return new SqlQueryExecutionResultDto
        {
            Success = result.Success,
            Message = result.Success
                ? (isDeployed ? QueryExecutedAndDeployedMessage : QueryExecutedSuccessfullyMessage)
                : result.Message,
            Data = result.Data,
            RowsAffected = result.RowsAffected,
            ExecutionTimeMs = result.ExecutionTimeMs,
            Metadata = result.Metadata
        };
    }

    public Task SaveTableScriptAsync(SaveTableScriptDto input)
    {
        // Security: reject any path traversal attempts
        if (string.IsNullOrWhiteSpace(input?.FileName) ||
            input.FileName.Contains('/') ||
            input.FileName.Contains('\\') ||
            input.FileName.Contains(".."))
        {
            throw new Volo.Abp.UserFriendlyException("Invalid file name.");
        }

        try
        {
            var outputPath = ResolveSqlDataOutputPath();
            Directory.CreateDirectory(outputPath);

            var safeFileName = string.Concat(input.FileName.Trim().Split(Path.GetInvalidFileNameChars()));
            var filePath = Path.Combine(outputPath, $"{safeFileName}.sql");
            File.WriteAllText(filePath, input.SqlScript);

            _logger.LogInformation("SQL seed file saved: {FilePath}", filePath);
        }
        catch (Exception ex)
        {
            // File save failure does not block the deploy
            _logger.LogError(ex, "Failed to save SQL seed file: {Message}", ex.Message);
        }

        return Task.CompletedTask;
    }

    private bool TrySyncSqlObjectScriptFile(string sqlScript)
    {
        if (string.IsNullOrWhiteSpace(sqlScript))
            return false;

        if (TrySaveSqlObjectScript(sqlScript))
            return true;

        return TryDeleteSqlObjectScripts(sqlScript);
    }

    private bool TrySaveSqlObjectScript(string sqlScript)
    {
        var match = SqlObjectDefinitionRegex.Match(sqlScript);
        if (!match.Success)
            return false;

        var objectType = NormalizeObjectType(match.Groups["type"].Value);
        var (schemaName, objectName) = ParseSchemaAndObjectName(match.Groups["name"].Value);

        if (string.IsNullOrWhiteSpace(objectName))
            return false;

        var fileName = BuildSqlObjectScriptFileName(objectType, schemaName, objectName);
        var canonicalScript = CanonicalizeSqlObjectScriptForSeed(sqlScript);
        SaveSqlDataFile(fileName, canonicalScript);
        return true;
    }

    private bool TryDeleteSqlObjectScripts(string sqlScript)
    {
        var match = SqlObjectDropRegex.Match(sqlScript);
        if (!match.Success)
            return false;

        var objectType = NormalizeObjectType(match.Groups["type"].Value);
        var rawNames = match.Groups["names"].Value
            .Split(',')
            .Select(x => x.Trim())
            .Where(x => !string.IsNullOrWhiteSpace(x))
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .ToList();

        foreach (var rawName in rawNames)
        {
            var (schemaName, objectName) = ParseSchemaAndObjectName(rawName);
            if (string.IsNullOrWhiteSpace(objectName))
                continue;

            var fileName = BuildSqlObjectScriptFileName(objectType, schemaName, objectName);
            DeleteSqlDataFile(fileName);
        }

        return rawNames.Count > 0;
    }

    private void SaveSqlDataFile(string fileName, string content)
    {
        try
        {
            var outputPath = ResolveSqlDataOutputPath();
            Directory.CreateDirectory(outputPath);

            var safeFileName = string.Concat(fileName.Split(Path.GetInvalidFileNameChars()));
            if (string.IsNullOrWhiteSpace(safeFileName))
                return;

            var filePath = Path.Combine(outputPath, $"{safeFileName}.sql");
            File.WriteAllText(filePath, content ?? string.Empty);
            _logger.LogInformation("SQL object script saved: {FilePath}", filePath);
        }
        catch (Exception ex)
        {
            // File save failure does not block query execution
            _logger.LogError(ex, "Failed to save SQL object script: {Message}", ex.Message);
        }
    }

    private void DeleteSqlDataFile(string fileName)
    {
        try
        {
            var outputPath = ResolveSqlDataOutputPath();
            if (!Directory.Exists(outputPath))
                return;

            var safeFileName = string.Concat(fileName.Split(Path.GetInvalidFileNameChars()));
            if (string.IsNullOrWhiteSpace(safeFileName))
                return;

            var filePath = Path.Combine(outputPath, $"{safeFileName}.sql");
            if (!File.Exists(filePath))
                return;

            File.Delete(filePath);
            _logger.LogInformation("SQL object script deleted: {FilePath}", filePath);
        }
        catch (Exception ex)
        {
            // File delete failure does not block query execution
            _logger.LogError(ex, "Failed to delete SQL object script: {Message}", ex.Message);
        }
    }

    private static string BuildSqlObjectScriptFileName(string objectType, string schemaName, string objectName)
    {
        return objectName;
    }

    private static string CanonicalizeSqlObjectScriptForSeed(string sqlScript)
    {
        if (string.IsNullOrWhiteSpace(sqlScript))
            return string.Empty;

        var canonical = SqlObjectHeaderCanonicalizeRegex.Replace(sqlScript, match =>
        {
            var prefix = match.Groups["prefix"].Value;
            var after = match.Groups["after"].Value;
            after = Regex.Replace(after, @"^OR\s+ALTER\s+", string.Empty, RegexOptions.IgnoreCase);
            return $"{prefix}CREATE OR ALTER {after}";
        }, 1);

        return canonical;
    }

    private static string NormalizeObjectType(string rawType)
    {
        if (string.Equals(rawType, "PROC", StringComparison.OrdinalIgnoreCase) ||
            string.Equals(rawType, "PROCEDURE", StringComparison.OrdinalIgnoreCase))
        {
            return "procedure";
        }

        if (string.Equals(rawType, "FUNCTION", StringComparison.OrdinalIgnoreCase))
        {
            return "function";
        }

        return "view";
    }

    private static (string SchemaName, string ObjectName) ParseSchemaAndObjectName(string fullName)
    {
        var parts = SplitSqlMultipartIdentifier(fullName)
            .Select(UnquoteSqlIdentifier)
            .Where(p => !string.IsNullOrWhiteSpace(p))
            .ToList();

        if (parts.Count == 0)
            return ("dbo", string.Empty);

        if (parts.Count == 1)
            return ("dbo", parts[0]);

        return (parts[^2], parts[^1]);
    }

    private static List<string> SplitSqlMultipartIdentifier(string value)
    {
        var parts = new List<string>();
        if (string.IsNullOrWhiteSpace(value))
            return parts;

        var buffer = new System.Text.StringBuilder();
        var inBracket = false;
        var inDoubleQuote = false;

        foreach (var ch in value)
        {
            if (ch == '[' && !inDoubleQuote)
            {
                inBracket = true;
                buffer.Append(ch);
                continue;
            }

            if (ch == ']' && inBracket)
            {
                inBracket = false;
                buffer.Append(ch);
                continue;
            }

            if (ch == '"' && !inBracket)
            {
                inDoubleQuote = !inDoubleQuote;
                buffer.Append(ch);
                continue;
            }

            if (ch == '.' && !inBracket && !inDoubleQuote)
            {
                var token = buffer.ToString().Trim();
                if (!string.IsNullOrWhiteSpace(token))
                    parts.Add(token);

                buffer.Clear();
                continue;
            }

            buffer.Append(ch);
        }

        var lastToken = buffer.ToString().Trim();
        if (!string.IsNullOrWhiteSpace(lastToken))
            parts.Add(lastToken);

        return parts;
    }

    private static string UnquoteSqlIdentifier(string value)
    {
        if (string.IsNullOrWhiteSpace(value))
            return string.Empty;

        value = value.Trim();
        if (value.Length >= 2 && value[0] == '[' && value[^1] == ']')
            return value.Substring(1, value.Length - 2);

        if (value.Length >= 2 && value[0] == '"' && value[^1] == '"')
            return value.Substring(1, value.Length - 2);

        return value;
    }

    [HttpPost("api/app/sql-object-manager/delete-sql-data-files")]
    public Task DeleteSqlDataFilesAsync(DeleteSqlDataFilesDto input)
    {
        if (input?.FileNames == null || input.FileNames.Count == 0)
            return Task.CompletedTask;

        try
        {
            var outputPath = ResolveSqlDataOutputPath();
            if (!Directory.Exists(outputPath))
                return Task.CompletedTask;

            foreach (var rawName in input.FileNames.Distinct())
            {
                if (string.IsNullOrWhiteSpace(rawName))
                    continue;

                // Security: reject any path traversal attempts
                if (rawName.Contains('/') || rawName.Contains('\\') || rawName.Contains(".."))
                    continue;

                var safeFileName = string.Concat(rawName.Trim().Split(Path.GetInvalidFileNameChars()));
                if (string.IsNullOrWhiteSpace(safeFileName))
                    continue;

                var filePath = Path.Combine(outputPath, $"{safeFileName}.sql");
                if (!File.Exists(filePath))
                    continue;

                File.Delete(filePath);
                _logger.LogInformation("SQL seed file deleted: {FilePath}", filePath);
            }
        }
        catch (Exception ex)
        {
            // File delete failure does not block drop operation
            _logger.LogError(ex, "Failed to delete SQL seed file(s): {Message}", ex.Message);
        }

        return Task.CompletedTask;
    }

    [HttpGet("api/app/sql-object-manager/sql-data-files")]
    public Task<List<SqlDataFileDto>> GetSqlDataFilesAsync(
        [FromQuery] string dataDirectoryName = "SqlData",
        [FromQuery] string relativePath = "")
    {
        ValidateTenantAccess();

        try
        {
            var rootPath = ResolveSqlDataOutputPath(dataDirectoryName);
            var outputPath = ResolveSqlDataChildPath(rootPath, relativePath);
            if (!Directory.Exists(outputPath))
                return Task.FromResult(new List<SqlDataFileDto>());

            var directories = Directory.GetDirectories(outputPath, "*", SearchOption.TopDirectoryOnly)
                .Where(d => string.Equals(Path.GetFileName(d), "HostData", StringComparison.OrdinalIgnoreCase))
                .Select(d => new SqlDataFileDto
                {
                    FileName = Path.GetFileName(d)!,
                    Name = Path.GetFileName(d)!,
                    RelativePath = BuildSqlDataRelativePath(relativePath, Path.GetFileName(d)!),
                    IsDirectory = true,
                    CreatedAt = Directory.GetCreationTime(d)
                });

            var files = Directory.GetFiles(outputPath, "*.sql", SearchOption.TopDirectoryOnly)
                .Select(f => new SqlDataFileDto
                {
                    FileName = Path.GetFileName(f)!,
                    Name = Path.GetFileName(f)!,
                    RelativePath = BuildSqlDataRelativePath(relativePath, Path.GetFileName(f)!),
                    IsDirectory = false,
                    CreatedAt = File.GetCreationTime(f)
                })
                .Where(x => !string.IsNullOrWhiteSpace(x.Name));

            var entries = directories
                .Concat(files)
                .OrderByDescending(x => x.IsDirectory)
                .ThenBy(x => x.Name, StringComparer.OrdinalIgnoreCase)
                .ToList();

            return Task.FromResult(entries);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to list SQL seed files: {Message}", ex.Message);
            return Task.FromResult(new List<SqlDataFileDto>());
        }
    }

    [HttpGet("api/app/sql-object-manager/sql-data-file-content")]
    public async Task<string> GetSqlDataFileContentAsync(
        [FromQuery] string dataDirectoryName = "SqlData",
        [FromQuery] string relativePath = "")
    {
        ValidateTenantAccess();

        var rootPath = ResolveSqlDataOutputPath(dataDirectoryName);
        var filePath = ResolveSqlDataChildPath(rootPath, relativePath);

        if (!File.Exists(filePath))
            throw new Volo.Abp.UserFriendlyException("SQL seed file was not found.");

        if (!string.Equals(Path.GetExtension(filePath), ".sql", StringComparison.OrdinalIgnoreCase))
            throw new Volo.Abp.UserFriendlyException("Only .sql files can be previewed.");

        return await File.ReadAllTextAsync(filePath);
    }

    [HttpPost("api/app/sql-object-manager/move-sql-data-file")]
    public Task MoveSqlDataFileAsync(MoveSqlDataFileDto input)
    {
        ValidateTenantAccess();

        if (input == null)
            throw new Volo.Abp.UserFriendlyException("Invalid move request.");

        var rootPath = ResolveSqlDataOutputPath(input.DataDirectoryName);
        var sourcePath = ResolveSqlDataChildPath(rootPath, input.SourceRelativePath);
        var targetPath = ResolveSqlDataChildPath(rootPath, input.TargetRelativePath);

        if (!File.Exists(sourcePath))
            throw new Volo.Abp.UserFriendlyException("Source file was not found.");

        if (!string.Equals(Path.GetExtension(sourcePath), ".sql", StringComparison.OrdinalIgnoreCase) ||
            !string.Equals(Path.GetExtension(targetPath), ".sql", StringComparison.OrdinalIgnoreCase))
        {
            throw new Volo.Abp.UserFriendlyException("Only .sql files can be moved.");
        }

        Directory.CreateDirectory(Path.GetDirectoryName(targetPath)!);

        if (File.Exists(targetPath))
            throw new Volo.Abp.UserFriendlyException("A file with the same name already exists in the target folder.");

        File.Move(sourcePath, targetPath);
        _logger.LogInformation("SQL seed file moved from {SourcePath} to {TargetPath}", sourcePath, targetPath);

        return Task.CompletedTask;
    }

    private string ResolveSqlDataOutputPath()
    {
        return ResolveSqlDataOutputPath("SqlData");
    }

    private string ResolveSqlDataOutputPath(string dataDirectoryName)
    {
        const string dbMigratorName = "Sozsoft.Platform.DbMigrator";
        var safeDirectoryName = NormalizeSqlDataDirectoryName(dataDirectoryName);
        var dir = new DirectoryInfo(_hostEnvironment.ContentRootPath);

        while (dir != null)
        {
            var candidate = Path.Combine(dir.FullName, "src", dbMigratorName, "Seeds");
            if (Directory.Exists(candidate))
                return Path.Combine(candidate, safeDirectoryName);

            candidate = Path.Combine(dir.FullName, dbMigratorName, "Seeds");
            if (Directory.Exists(candidate))
                return Path.Combine(candidate, safeDirectoryName);

            dir = dir.Parent;
        }

        return Path.Combine(_hostEnvironment.ContentRootPath, "Seeds", safeDirectoryName);
    }

    private static string NormalizeSqlDataDirectoryName(string dataDirectoryName)
    {
        return string.Equals(dataDirectoryName, "PostgresData", StringComparison.OrdinalIgnoreCase)
            ? "PostgresData"
            : "SqlData";
    }

    private static string ResolveSqlDataChildPath(string rootPath, string relativePath)
    {
        var normalized = NormalizeSqlDataRelativePath(relativePath);
        var fullPath = Path.GetFullPath(Path.Combine(rootPath, normalized));
        var fullRoot = Path.GetFullPath(rootPath);
        var fullRootWithSeparator = fullRoot.EndsWith(Path.DirectorySeparatorChar)
            ? fullRoot
            : fullRoot + Path.DirectorySeparatorChar;

        if (!string.Equals(fullPath, fullRoot, StringComparison.OrdinalIgnoreCase) &&
            !fullPath.StartsWith(fullRootWithSeparator, StringComparison.OrdinalIgnoreCase))
        {
            throw new Volo.Abp.UserFriendlyException("Invalid path.");
        }

        return fullPath;
    }

    private static string NormalizeSqlDataRelativePath(string relativePath)
    {
        if (string.IsNullOrWhiteSpace(relativePath))
            return string.Empty;

        var normalized = relativePath.Replace('\\', '/').Trim('/');
        var parts = normalized.Split('/', StringSplitOptions.RemoveEmptyEntries);

        if (parts.Length == 0)
            return string.Empty;

        if (parts.Any(p => p == "." || p == ".." || p.IndexOfAny(Path.GetInvalidFileNameChars()) >= 0))
            throw new Volo.Abp.UserFriendlyException("Invalid path.");

        var isRootFile = parts.Length == 1 && parts[0].EndsWith(".sql", StringComparison.OrdinalIgnoreCase);
        var isHostDataFolder = parts.Length == 1 && string.Equals(parts[0], "HostData", StringComparison.OrdinalIgnoreCase);
        var isHostDataFile = parts.Length == 2 &&
            string.Equals(parts[0], "HostData", StringComparison.OrdinalIgnoreCase) &&
            parts[1].EndsWith(".sql", StringComparison.OrdinalIgnoreCase);

        if (!isRootFile && !isHostDataFolder && !isHostDataFile)
            throw new Volo.Abp.UserFriendlyException("Invalid path.");

        return Path.Combine(parts);
    }

    private static string BuildSqlDataRelativePath(string parentRelativePath, string name)
    {
        if (string.IsNullOrWhiteSpace(parentRelativePath))
            return name;

        return $"{parentRelativePath.Trim('/', '\\')}/{name}";
    }
}