using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using Erp.Platform.DynamicData;
using Erp.Platform.Entities;
using Erp.Platform.Enums;
using Erp.Platform.ListForms;
using Erp.Platform.Localization;
using Microsoft.Extensions.Localization;
using Microsoft.Extensions.Primitives;
using Volo.Abp.ObjectMapping;
using Volo.Abp.Settings;
using Volo.Abp.Users;

namespace Erp.Platform.Queries;

public interface IQueryManager
{
    Task<T> GenerateAndRunQueryAsync<T>(
        string listFormCode,
        OperationEnum op,
        dynamic inputParams = null,
        object[] keys = null,
        Dictionary<string, StringValues> queryParameters = null);

    string GenerateQuery(
        ListForm listForm,
        Dictionary<string, object> parameters,
        OperationEnum op,
        DataSourceTypeEnum dataSourceType,
        object[] keys = null);
}

public class QueryManager : PlatformDomainService, IQueryManager
{
    private readonly IStringLocalizer<PlatformResource> localizer;
    private readonly IListFormManager listFormManager;
    private readonly IListFormFieldManager listFormFieldManager;
    private readonly IDefaultValueManager defaultValueManager;
    private readonly IDataSourceManager dataSourceManager;
    private readonly IDynamicDataManager dynamicDataManager;

    public QueryManager(
        ISettingProvider settingProvider,
        IStringLocalizer<PlatformResource> localizer,
        ICurrentUser currentUser,
        IObjectMapper objectMapper,
        IListFormAuthorizationManager authManager,
        IListFormManager listFormManager,
        IListFormFieldManager listFormFieldManager,
        IDefaultValueManager defaultValueManager,
        IDataSourceManager dataSourceManager,
        IDynamicDataManager dynamicDataManager)
        : base(settingProvider, localizer, currentUser, objectMapper, authManager)
    {
        this.localizer = localizer;
        this.listFormManager = listFormManager;
        this.listFormFieldManager = listFormFieldManager;
        this.defaultValueManager = defaultValueManager;
        this.dataSourceManager = dataSourceManager;
        this.dynamicDataManager = dynamicDataManager;
    }

    public async Task<T> GenerateAndRunQueryAsync<T>(
        string listFormCode,
        OperationEnum op,
        dynamic inputParams = null,
        object[] keys = null,
        Dictionary<string, StringValues> queryParameters = null) //TODO SEND QUERY PARAMS
    {
        // kullaniciya ait ListForm verisini al
        var listForm = await listFormManager.GetUserListForm(listFormCode);

        // kullaniciya ait ListFormField verisini al
        var listFormFields = await listFormFieldManager.GetUserListFormFields(listFormCode);

        var parameters = await listFormManager.GetParametersAsync(listForm, listFormFields, inputParams, op, keys, queryParameters);
        // if (parameters == null || parameters.Count == 0)
        // {
        //     throw new UserFriendlyException(localizer[AppErrorCodes.ParameterNotValid]);
        // }

        var (dynamicDataRepository, connectionString, dataSourceType) = await dynamicDataManager.GetAsync(listForm.IsTenant, listForm.DataSourceCode);

        var sql = GenerateQuery(listForm, parameters, op, dataSourceType, keys);

        // Sorguyu calistir
        if (!string.IsNullOrEmpty(sql))
        {
            // TODO: Log
            if (op == OperationEnum.Insert)
            {
                return await dynamicDataRepository.ExecuteScalarAsync<T>(sql, connectionString, parameters);
            }
            else if (op == OperationEnum.Update || op == OperationEnum.Delete)
            {
                return (T)(object)await dynamicDataRepository.ExecuteAsync(sql, connectionString, parameters);
            }
        }

        return default;
    }

    public string GenerateQuery(
        ListForm listForm,
        Dictionary<string, object> parameters,
        OperationEnum op,
        DataSourceTypeEnum dataSourceType,
        object[] keys = null)
    {
        var command = op switch
        {
            OperationEnum.Insert => listForm.InsertCommand,
            OperationEnum.Update => listForm.UpdateCommand,
            OperationEnum.Delete => listForm.DeleteCommand,
            _ => "",
        };

        // Sorguyu generate et
        var sql = string.Empty;
        // oncelik Command alanindadir, dolu ise silme islemi buradaki sorguya yonlendirilir
        if (!string.IsNullOrEmpty(command))
        {
            sql = command;
        }
        else
        {
            var fieldString = string.Join(',', parameters.Keys.Select(a => $"\"{a}\"").ToList());
            var fieldParams = string.Join(',', parameters.Keys.Select(a => $"@{a}"));

            if (op == OperationEnum.Insert)
            {
                sql = dataSourceType switch
                {
                    DataSourceTypeEnum.Mssql => $"INSERT INTO \"{listForm.SelectCommand}\" ({fieldString}) OUTPUT Inserted.{listForm.KeyFieldName} VALUES ({fieldParams})",
                    DataSourceTypeEnum.Postgresql => $"INSERT INTO \"{listForm.SelectCommand}\" ({fieldString}) VALUES ({fieldParams}) RETURNING \"{listForm.KeyFieldName}\"",
                    _ => string.Empty,
                };
            }
            else if (op == OperationEnum.Update)
            {
                var where = dataSourceType switch
                {
                    DataSourceTypeEnum.Mssql => $"\"{listForm.KeyFieldName}\" IN (@{listForm.KeyFieldName})",
                    DataSourceTypeEnum.Postgresql => $"\"{listForm.KeyFieldName}\" = ANY(@{listForm.KeyFieldName})",
                    _ => string.Empty,
                };
                var updateFields = parameters.Select(a => $"\"{a.Key}\" = @{a.Key}").ToList();
                var val = QueryHelper.GetFormattedValue(listForm.KeyFieldDbSourceType, keys);
                parameters.Add(
                    listForm.KeyFieldName,
                    val.GetType().IsArray ? val : new object[] { val });
                sql = $"UPDATE \"{listForm.SelectCommand}\" SET {string.Join(',', updateFields)} WHERE {where}";
            }
            else if (op == OperationEnum.Delete)
            {
                // todo: softdelete
                string where = string.Empty;
                if (parameters.Any())
                {
                    where = string.Join(" AND ", parameters.Select(a => $"\"{a.Key}\" IN (@{a.Key})").ToList());
                }
                else
                {
                    var val = QueryHelper.GetFormattedValue(listForm.KeyFieldDbSourceType, keys);
                    parameters.Add(
                        listForm.KeyFieldName,
                        val.GetType().IsArray ? val : new object[] { val });

                    where = dataSourceType switch
                    {
                        DataSourceTypeEnum.Mssql => $"\"{listForm.KeyFieldName}\" IN (@{listForm.KeyFieldName})",
                        DataSourceTypeEnum.Postgresql => $"\"{listForm.KeyFieldName}\" = ANY(@{listForm.KeyFieldName})",
                        _ => "1 = 0",
                    };
                }
                sql = $"DELETE FROM \"{listForm.SelectCommand}\" WHERE {where}";
                Console.WriteLine(sql);
            }
        }

        return sql;
    }
}