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

namespace Sozsoft.Mcp;

/// <summary>
/// Veri yazma yuzeyi. Yazma her zaman bir ListForm ekraninin insert/update/delete
/// sozlesmesinden gecer; ekran yetkisi, tenant filtresi ve seed senkronizasyonu oradaki
/// yoldan aynen uygulanir.
/// </summary>
[Authorize(PlatformConsts.AppCodes.DeveloperKits.McpServers.Invoke)]
public class McpDataAppService(
    IMcpServerConfigProvider serverConfigProvider,
    IListFormDataAppService listFormDataAppService,
    IMcpListFormAccessFilter accessFilter,
    IMcpDevRequestTimesheetRecorder timesheetRecorder,
    IModuleDocAppService moduleDocAppService)
    : McpAppService(serverConfigProvider), IMcpDataAppService
{
    private const string DevRequestStatusField = "Status";
    private const string DevRequestTestingStatus = "Testing";

    public async Task<McpWriteResultDto> InsertRowAsync(McpRowRequestDto input)
    {
        var request = await BuildRequestAsync(input, McpToolNames.InsertRow, AuthorizationTypeEnum.Create, requireKeys: false, requireValues: true);
        var key = await listFormDataAppService.PostInsertAsync(request);
        await timesheetRecorder.RecordAsync(McpTimesheetTexts.InsertRow, input.ListFormCode);

        return new McpWriteResultDto { Key = ((object?)key)?.ToString() };
    }

    public async Task<McpWriteResultDto> UpdateRowAsync(McpRowRequestDto input)
    {
        var request = await BuildRequestAsync(input, McpToolNames.UpdateRow, AuthorizationTypeEnum.Update, requireKeys: true, requireValues: true);
        await EnsureModuleDocsBeforeTestingAsync(input);
        var affected = await listFormDataAppService.PostUpdateAsync(request);
        await timesheetRecorder.RecordAsync(McpTimesheetTexts.UpdateRow, input.ListFormCode, string.Join(", ", input.Values.Keys));

        return new McpWriteResultDto { AffectedRows = affected };
    }

    public async Task<McpWriteResultDto> DeleteRowAsync(McpRowRequestDto input)
    {
        var request = await BuildRequestAsync(input, McpToolNames.DeleteRow, AuthorizationTypeEnum.Delete, requireKeys: true, requireValues: false);
        var affected = await listFormDataAppService.PostDeleteAsync(request);
        await timesheetRecorder.RecordAsync(McpTimesheetTexts.DeleteRow, input.ListFormCode);

        return new McpWriteResultDto { AffectedRows = affected };
    }

    /// <summary>
    /// Gelistirme talebi Testing'e alinirken talebin urettigi wizard'larin modul dokumani bolumleri
    /// tamam olmalidir (lowcode §0.13): bolum var ve doldurulmamis (<c>module-doc:todo</c>) alt bolum yok.
    /// Talebi Testing'e alan tek yol <c>update_row</c> oldugu icin kural burada uygulanir. Wizard
    /// okuma yetkisi olmayan kullanici wizard uretemeyecegi icin kontrol ona uygulanmaz.
    /// </summary>
    private async Task EnsureModuleDocsBeforeTestingAsync(McpRowRequestDto input)
    {
        if (!string.Equals(input.ListFormCode, PlatformConsts.AppCodes.DevRequests, StringComparison.OrdinalIgnoreCase))
            return;

        var status = input.Values?.FirstOrDefault(v => string.Equals(v.Key, DevRequestStatusField, StringComparison.OrdinalIgnoreCase)).Value?.ToString();
        if (!string.Equals(status, DevRequestTestingStatus, StringComparison.OrdinalIgnoreCase))
            return;

        if (!await AuthorizationService.IsGrantedAsync(PlatformConsts.AppCodes.Listforms.Wizard))
            return;

        foreach (var key in input.Keys ?? [])
        {
            if (!Guid.TryParse(key?.ToString(), out var devRequestId))
                continue;

            var incomplete = await moduleDocAppService.GetIncompleteForDevRequestAsync(devRequestId);
            if (incomplete.Count == 0)
                continue;

            var detail = string.Join("; ", incomplete.Select(doc => $"{doc.Path} ({string.Join(", ", doc.MissingSections)})"));

            throw new UserFriendlyException(L[McpErrorCodes.DevRequestModuleDocsIncomplete, detail]);
        }
    }

    /// <summary>
    /// Istegi ekranin bekledigi bicime cevirir. <c>Data</c> JSON metni olarak verilir; ayni
    /// bicim ekranin kopyalama yolunda da kullanilir.
    /// </summary>
    private async Task<DataRequestDto> BuildRequestAsync(
        McpRowRequestDto input,
        string toolName,
        AuthorizationTypeEnum operation,
        bool requireKeys,
        bool requireValues)
    {
        Check.NotNull(input, nameof(input));

        await EnsureToolAllowedAsync(toolName);

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

        // Ekranin kendi kontrolu reddi adsiz bir hatayla bildirir; yetki burada adiyla istenir ki
        // istemci hangi yetkinin eksik oldugunu gorsun.
        var permission = await accessFilter.GetPermissionNameAsync(input.ListFormCode, operation);
        if (permission is not null)
        {
            await AuthorizationService.CheckAsync(permission);
        }

        if (requireValues && (input.Values is null || input.Values.Count == 0))
        {
            throw new UserFriendlyException(L[McpErrorCodes.ValuesRequired]);
        }

        if (requireKeys && (input.Keys is null || input.Keys.Count == 0))
        {
            throw new UserFriendlyException(L[McpErrorCodes.KeysRequired]);
        }

        return new DataRequestDto
        {
            ListFormCode = input.ListFormCode,
            Data = JsonSerializer.Serialize(input.Values ?? new Dictionary<string, object?>()),
            Keys = [.. (input.Keys ?? []).Select(key => key!)]
        };
    }
}