using System.ComponentModel.DataAnnotations;

using Cleanuparr.Api.Features.QueueCleaner.Contracts.Requests;
using Cleanuparr.Infrastructure.Models;
using Cleanuparr.Infrastructure.Services.Interfaces;
using Cleanuparr.Infrastructure.Utilities;
using Cleanuparr.Persistence;
using Cleanuparr.Persistence.Models.Configuration;
using Cleanuparr.Persistence.Models.Configuration.QueueCleaner;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

namespace Cleanuparr.Api.Features.QueueCleaner.Controllers;

[ApiController]
[Route("api/configuration")]
public sealed class QueueCleanerConfigController : ControllerBase
{
    private readonly ILogger<QueueCleanerConfigController> _logger;
    private readonly DataContext _dataContext;
    private readonly IJobManagementService _jobManagementService;

    public QueueCleanerConfigController(
        ILogger<QueueCleanerConfigController> logger,
        DataContext dataContext,
        IJobManagementService jobManagementService)
    {
        _logger = logger;
        _dataContext = dataContext;
        _jobManagementService = jobManagementService;
    }

    [HttpGet("queue_cleaner")]
    public async Task<IActionResult> GetQueueCleanerConfig()
    {
        await DataContext.Lock.WaitAsync();
        try
        {
            var config = await _dataContext.QueueCleanerConfigs
                .AsNoTracking()
                .FirstAsync();
            return Ok(config);
        }
        finally
        {
            DataContext.Lock.Release();
        }
    }

    [HttpPut("queue_cleaner")]
    public async Task<IActionResult> UpdateQueueCleanerConfig([FromBody] UpdateQueueCleanerConfigRequest newConfigDto)
    {
        await DataContext.Lock.WaitAsync();
        try
        {
            if (!string.IsNullOrEmpty(newConfigDto.CronExpression))
            {
                CronValidationHelper.ValidateCronExpression(newConfigDto.CronExpression);
            }

            var oldConfig = await _dataContext.QueueCleanerConfigs
                .FirstAsync();

            oldConfig.Enabled = newConfigDto.Enabled;
            oldConfig.CronExpression = newConfigDto.CronExpression;
            oldConfig.UseAdvancedScheduling = newConfigDto.UseAdvancedScheduling;
            oldConfig.FailedImport = newConfigDto.FailedImport;
            oldConfig.DownloadingMetadataMaxStrikes = newConfigDto.DownloadingMetadataMaxStrikes;
            oldConfig.IgnoredDownloads = newConfigDto.IgnoredDownloads;
            
            oldConfig.Validate();

            await _dataContext.SaveChangesAsync();

            await UpdateJobSchedule(oldConfig, JobType.QueueCleaner);

            return Ok(new { Message = "QueueCleaner configuration updated successfully" });
        }
        catch (ValidationException ex)
        {
            return BadRequest(ex.Message);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to save QueueCleaner configuration");
            throw;
        }
        finally
        {
            DataContext.Lock.Release();
        }
    }

    private async Task UpdateJobSchedule(IJobConfig config, JobType jobType)
    {
        if (config.Enabled)
        {
            if (!string.IsNullOrEmpty(config.CronExpression))
            {
                _logger.LogInformation("{name} is enabled, updating job schedule with cron expression: {CronExpression}",
                    jobType.ToString(), config.CronExpression);

                await _jobManagementService.StartJob(jobType, null, config.CronExpression);
            }
            else
            {
                _logger.LogWarning("{name} is enabled, but no cron expression was found in the configuration", jobType.ToString());
            }

            return;
        }

        _logger.LogInformation("{name} is disabled, stopping the job", jobType.ToString());
        await _jobManagementService.StopJob(jobType);
    }
}