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.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.Write)]
public class McpDataAppService(
    IMcpServerConfigProvider serverConfigProvider,
    IListFormDataAppService listFormDataAppService)
    : McpAppService(serverConfigProvider), IMcpDataAppService
{
    public async Task<McpWriteResultDto> InsertRowAsync(McpRowRequestDto input)
    {
        var request = await BuildRequestAsync(input, McpToolNames.InsertRow, requireKeys: false, requireValues: true);
        var key = await listFormDataAppService.PostInsertAsync(request);

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

    public async Task<McpWriteResultDto> UpdateRowAsync(McpRowRequestDto input)
    {
        var request = await BuildRequestAsync(input, McpToolNames.UpdateRow, requireKeys: true, requireValues: true);
        var affected = await listFormDataAppService.PostUpdateAsync(request);

        return new McpWriteResultDto { AffectedRows = affected };
    }

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

        return new McpWriteResultDto { AffectedRows = affected };
    }

    /// <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,
        bool requireKeys,
        bool requireValues)
    {
        Check.NotNull(input, nameof(input));

        // AllowWrite kapaliysa yazma araclari McpToolPolicy tarafindan zaten reddedilir;
        // burada ayri bir kontrol yok.
        await EnsureToolAllowedAsync(toolName);

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

        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!)]
        };
    }
}