using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Nodes;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Sozsoft.Mcp.Dtos;
using Sozsoft.Mcp.Services;
using Sozsoft.Platform;
using Sozsoft.Platform.DeveloperKit;
using Sozsoft.Platform.ListForms;
using Volo.Abp;
using Volo.Abp.Application.Dtos;

namespace Sozsoft.Mcp;

/// <summary>
/// Ekran ve bilesen gelistirme yuzeyi. Uretim Wizard ve Custom Components servislerinden
/// gecer: menu, yetki, dil anahtari, seed dosyasi ve bagimlilik kurallari ekrandaki yolla
/// aynidir, yetki kontrolu de o servislerin kendi politikalarindan gelir. Develop yetkisi
/// yalnizca MCP kapisidir, arkadaki yetkinin yerine gecmez.
/// </summary>
[Authorize(PlatformConsts.AppCodes.DeveloperKits.McpServers.Develop)]
public class McpDevelopAppService(
    IMcpServerConfigProvider serverConfigProvider,
    IMcpDevGuide devGuide,
    IMcpTableCreator tableCreator,
    IListFormWizardAppService wizardAppService,
    ICustomComponentAppService componentAppService)
    : McpAppService(serverConfigProvider), IMcpDevelopAppService
{
    private const string DefaultGuideDocument = "lowcode";

    /// <summary>Index cevabinda listelenen en derin baslik; daha derini bolum istenince gorunur.</summary>
    private const int IndexHeadingLevel = 3;

    /// <summary>Custom Components ekraninin tek sayfada dondurebildigi ust sinir.</summary>
    private const int ComponentPageSize = 1000;

    public async Task<McpDevGuideDto> GetDevGuideAsync(string? document, string? section)
    {
        await EnsureToolAllowedAsync(McpToolNames.GetDevGuide);

        if (string.IsNullOrWhiteSpace(section))
        {
            var headings = await devGuide.GetHeadingsAsync();
            if (headings.Count == 0)
            {
                throw new UserFriendlyException(L[McpErrorCodes.DevGuideUnavailable, McpDevGuide.ConfigurationKey]);
            }

            return new McpDevGuideDto
            {
                Sections = [.. headings
                    .Where(h => h.Level <= IndexHeadingLevel)
                    .Where(h => string.IsNullOrWhiteSpace(document) || string.Equals(h.Document, document, StringComparison.OrdinalIgnoreCase))
                    .Select(ToDto)]
            };
        }

        var result = await devGuide.GetSectionAsync(
            string.IsNullOrWhiteSpace(document) ? DefaultGuideDocument : document,
            section)
            ?? throw new UserFriendlyException(L[McpErrorCodes.DevGuideSectionNotFound, section]);

        return new McpDevGuideDto
        {
            Heading = ToDto(result.Heading),
            Content = result.Content,
            Sections = [.. result.Children.Select(ToDto)]
        };
    }

    /// <summary>
    /// Tablo tasarimcisiyla ayni yetkiyi ister: ham DDL liste yetkilerini asar, Develop yalnizca
    /// MCP kapisidir.
    /// </summary>
    public async Task<McpCreateTableResultDto> CreateTableAsync(McpCreateTableRequestDto input)
    {
        Check.NotNull(input, nameof(input));
        await EnsureToolAllowedAsync(McpToolNames.CreateTable);
        await AuthorizationService.CheckAsync(PlatformConsts.AppCodes.SqlQueryManagers.Default);

        var created = await tableCreator.CreateAsync(new McpTableDefinition(
            input.TableName,
            [.. (input.Columns ?? []).Select(column => new McpTableColumn(
                column.Name, column.Type, column.MaxLength, column.IsNullable, column.DefaultValue))],
            input.FullAudited,
            input.MultiTenant));

        return new McpCreateTableResultDto
        {
            TableName = created.TableName,
            Script = created.Script,
            SeedFilePath = created.SeedFilePath
        };
    }

    public async Task<List<WizardFileInfoDto>> GetWizardsAsync(string? search)
    {
        await EnsureToolAllowedAsync(McpToolNames.ListWizards);

        var files = await wizardAppService.GetFiles();
        if (string.IsNullOrWhiteSpace(search))
        {
            return files;
        }

        return [.. files.Where(file =>
            Contains(file.FileName, search) || Contains(file.WizardName, search) ||
            Contains(file.ListFormCode, search) || Contains(file.CustomComponentName, search))];
    }

    public async Task<McpWizardFileDto> GetWizardAsync(string fileName)
    {
        await EnsureToolAllowedAsync(McpToolNames.GetWizard);

        var seed = await wizardAppService.GetFile(fileName);

        // Model dosyayi Claude Code'un depoda gordugu bicimde gorur; deploy_wizard ayni bicimi
        // geri kabul eder.
        using var document = JsonDocument.Parse(seed.ToSeedJson());

        return new McpWizardFileDto { FileName = fileName, Seed = document.RootElement.Clone() };
    }

    public async Task<WizardFileInfoDto?> DeployWizardAsync(McpWizardDeployRequestDto input)
    {
        Check.NotNull(input, nameof(input));
        await EnsureToolAllowedAsync(McpToolNames.DeployWizard);

        var wizard = ParseWizard(input.Wizard);
        wizard.EditFileName = string.IsNullOrWhiteSpace(input.ReplaceFileName) ? null : input.ReplaceFileName.Trim();

        await wizardAppService.Create(wizard);

        var files = await wizardAppService.GetFiles();

        return files.FirstOrDefault(file => string.Equals(file.WizardName, wizard.WizardName?.Trim(), StringComparison.OrdinalIgnoreCase));
    }

    public async Task<WizardDeleteResultDto> DeleteWizardAsync(string fileName)
    {
        await EnsureToolAllowedAsync(McpToolNames.DeleteWizard);

        return await wizardAppService.DeleteFile(fileName);
    }

    public async Task<List<McpComponentSummaryDto>> GetComponentsAsync(string? search)
    {
        await EnsureToolAllowedAsync(McpToolNames.ListComponents);

        var components = await GetAllComponentsAsync();

        return [.. components
            .Where(component => string.IsNullOrWhiteSpace(search)
                             || Contains(component.Name, search)
                             || Contains(component.RoutePath, search)
                             || Contains(component.Description, search))
            .Select(component => new McpComponentSummaryDto
            {
                Id = component.Id,
                Name = component.Name,
                RoutePath = component.RoutePath,
                Description = component.Description,
                IsActive = component.IsActive,
                IsVisualDesigner = IsVisualDesignerDocument(component.Props)
            })];
    }

    public async Task<CustomComponentDto?> GetComponentAsync(string name)
    {
        await EnsureToolAllowedAsync(McpToolNames.GetComponent);

        return await FindComponentAsync(name);
    }

    public async Task<CustomComponentDto> SaveComponentAsync(McpComponentSaveRequestDto input)
    {
        Check.NotNull(input, nameof(input));
        await EnsureToolAllowedAsync(McpToolNames.SaveComponent);

        if (string.IsNullOrWhiteSpace(input.Name))
        {
            throw new UserFriendlyException(L[McpErrorCodes.ComponentNameRequired]);
        }

        var existing = await FindComponentAsync(input.Name);
        var props = input.Props ?? existing?.Props;

        // Tasarimci belgesinde kod belgeden uretilir; buraya yazilan kod tasarimcidaki ilk
        // kayitta sessizce ezilirdi. Belge MCP'de uretilemedigi icin bu bilesenler tasarimcida kalir.
        if (IsVisualDesignerDocument(props))
        {
            throw new UserFriendlyException(L[McpErrorCodes.VisualDesignerComponent, input.Name]);
        }

        if (existing is null)
        {
            if (string.IsNullOrWhiteSpace(input.Code))
            {
                throw new UserFriendlyException(L[McpErrorCodes.ComponentCodeRequired]);
            }

            return await componentAppService.CreateAsync(new CreateUpdateCustomComponentDto
            {
                Name = input.Name.Trim(),
                Code = input.Code,
                RoutePath = input.RoutePath,
                Description = input.Description,
                Props = props,
                Dependencies = input.Dependencies,
                IsActive = input.IsActive ?? true
            });
        }

        return await componentAppService.UpdateAsync(existing.Id, new CreateUpdateCustomComponentDto
        {
            Name = existing.Name,
            Code = string.IsNullOrWhiteSpace(input.Code) ? existing.Code : input.Code,
            RoutePath = input.RoutePath ?? existing.RoutePath,
            Description = input.Description ?? existing.Description,
            Props = props,
            Dependencies = input.Dependencies ?? existing.Dependencies,
            IsActive = input.IsActive ?? existing.IsActive
        });
    }

    public async Task DeleteComponentAsync(string name)
    {
        await EnsureToolAllowedAsync(McpToolNames.DeleteComponent);

        var component = await FindComponentAsync(name)
                        ?? throw new UserFriendlyException(L[McpErrorCodes.ComponentNotFound, name]);

        await componentAppService.DeleteAsync(component.Id);
    }

    /// <summary>
    /// Wizard'i seed dosyasi biciminden (<c>{"Wizard": {...}}</c>) ya da duz cevaplardan okur.
    /// Iki bicim de dosyanin okuma kuralindan gecer; boylece Menu/Language bloklari ve
    /// WizardCode/ModuleId adlari dosyadakiyle ayni anlama gelir.
    /// </summary>
    private ListFormWizardDto ParseWizard(string? json)
    {
        JsonObject? root;
        try
        {
            root = string.IsNullOrWhiteSpace(json) ? null : JsonNode.Parse(json) as JsonObject;
        }
        catch (JsonException)
        {
            root = null;
        }

        if (root is null)
        {
            throw new UserFriendlyException(L[McpErrorCodes.InvalidWizard]);
        }

        var seedJson = root.ContainsKey(nameof(WizardSeedFileDto.Wizard))
            ? root.ToJsonString()
            : new JsonObject { [nameof(WizardSeedFileDto.Wizard)] = root }.ToJsonString();

        try
        {
            return WizardSeedFileDto.FromSeedJson(seedJson)?.Wizard
                   ?? throw new UserFriendlyException(L[McpErrorCodes.InvalidWizard]);
        }
        catch (JsonException)
        {
            throw new UserFriendlyException(L[McpErrorCodes.InvalidWizard]);
        }
    }

    private async Task<IReadOnlyList<CustomComponentDto>> GetAllComponentsAsync()
    {
        var page = await componentAppService.GetListAsync(new PagedAndSortedResultRequestDto
        {
            MaxResultCount = ComponentPageSize,
            Sorting = nameof(CustomComponentDto.Name)
        });

        return page.Items;
    }

    private async Task<CustomComponentDto?> FindComponentAsync(string? name)
    {
        if (string.IsNullOrWhiteSpace(name))
        {
            return null;
        }

        var components = await GetAllComponentsAsync();

        return components.FirstOrDefault(component => string.Equals(component.Name, name.Trim(), StringComparison.OrdinalIgnoreCase));
    }

    /// <summary>
    /// Props icinde tasarimci belgesi varsa ve kip acikca <c>code</c> degilse kod belgeden
    /// uretilir; tasarimcinin varsayilan kipi <c>visual</c>'dir.
    /// </summary>
    private static bool IsVisualDesignerDocument(string? props)
    {
        if (string.IsNullOrWhiteSpace(props))
        {
            return false;
        }

        try
        {
            using var document = JsonDocument.Parse(props);
            if (document.RootElement.ValueKind != JsonValueKind.Object ||
                !document.RootElement.TryGetProperty("visualDesigner", out var designer) ||
                designer.ValueKind != JsonValueKind.Object)
            {
                return false;
            }

            return !designer.TryGetProperty("sourceMode", out var mode) ||
                   mode.ValueKind != JsonValueKind.String ||
                   !string.Equals(mode.GetString(), "code", StringComparison.Ordinal);
        }
        catch (JsonException)
        {
            return false;
        }
    }

    private static bool Contains(string? value, string search)
        => value?.Contains(search.Trim(), StringComparison.OrdinalIgnoreCase) == true;

    private static McpDevGuideHeadingDto ToDto(McpDevGuideHeading heading) => new()
    {
        Document = heading.Document,
        Id = heading.Id,
        Title = heading.Title,
        Level = heading.Level
    };
}