using DiunaBI.Application.DTOModels.Common;
using DiunaBI.Domain.Entities;
using DiunaBI.Infrastructure.Data;
using DiunaBI.Infrastructure.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace DiunaBI.API.Controllers;

[Authorize]
[ApiController]
[Route("[controller]")]
public class JobsController : Controller
{
    private readonly AppDbContext _db;
    private readonly JobSchedulerService _jobScheduler;
    private readonly IConfiguration _configuration;
    private readonly ILogger<JobsController> _logger;

    public JobsController(
        AppDbContext db,
        JobSchedulerService jobScheduler,
        IConfiguration configuration,
        ILogger<JobsController> logger)
    {
        _db = db;
        _jobScheduler = jobScheduler;
        _configuration = configuration;
        _logger = logger;
    }

    [HttpGet]
    [Route("")]
    public async Task<IActionResult> GetAll(
        [FromQuery] int start = 0,
        [FromQuery] int limit = 50,
        [FromQuery] JobStatus? status = null,
        [FromQuery] JobType? jobType = null,
        [FromQuery] Guid? layerId = null)
    {
        try
        {
            var query = _db.QueueJobs.AsQueryable();

            if (status.HasValue)
            {
                query = query.Where(j => j.Status == status.Value);
            }

            if (jobType.HasValue)
            {
                query = query.Where(j => j.JobType == jobType.Value);
            }

            if (layerId.HasValue)
            {
                query = query.Where(j => j.LayerId == layerId.Value);
            }

            var totalCount = await query.CountAsync();

            var items = await query
                .OrderByDescending(j => j.CreatedAt)
                .Skip(start)
                .Take(limit)
                .AsNoTracking()
                .ToListAsync();

            var pagedResult = new PagedResult<QueueJob>
            {
                Items = items,
                TotalCount = totalCount,
                Page = (start / limit) + 1,
                PageSize = limit
            };

            _logger.LogDebug("GetAll: Retrieved {Count} of {TotalCount} jobs", items.Count, totalCount);

            return Ok(pagedResult);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "GetAll: Error retrieving jobs");
            return BadRequest(ex.ToString());
        }
    }

    [HttpGet]
    [Route("{id:guid}")]
    public async Task<IActionResult> Get(Guid id)
    {
        try
        {
            var job = await _db.QueueJobs
                .AsNoTracking()
                .FirstOrDefaultAsync(j => j.Id == id);

            if (job == null)
            {
                _logger.LogWarning("Get: Job {JobId} not found", id);
                return NotFound("Job not found");
            }

            _logger.LogDebug("Get: Retrieved job {JobId}", id);
            return Ok(job);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Get: Error retrieving job {JobId}", id);
            return BadRequest(ex.ToString());
        }
    }

    [HttpPost]
    [Route("schedule/{apiKey}")]
    [AllowAnonymous]
    public async Task<IActionResult> ScheduleJobs(string apiKey, [FromQuery] string? nameFilter = null)
    {
        if (apiKey != _configuration["apiKey"])
        {
            _logger.LogWarning("ScheduleJobs: Unauthorized request with apiKey {ApiKey}", apiKey);
            return Unauthorized();
        }

        try
        {
            var jobsCreated = await _jobScheduler.ScheduleAllJobsAsync(nameFilter);

            _logger.LogInformation("ScheduleJobs: Created {Count} jobs", jobsCreated);

            return Ok(new
            {
                success = true,
                jobsCreated,
                message = $"Successfully scheduled {jobsCreated} jobs"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "ScheduleJobs: Error scheduling jobs");
            return BadRequest(ex.ToString());
        }
    }

    [HttpPost]
    [Route("schedule/imports/{apiKey}")]
    [AllowAnonymous]
    public async Task<IActionResult> ScheduleImportJobs(string apiKey, [FromQuery] string? nameFilter = null)
    {
        if (apiKey != _configuration["apiKey"])
        {
            _logger.LogWarning("ScheduleImportJobs: Unauthorized request with apiKey {ApiKey}", apiKey);
            return Unauthorized();
        }

        try
        {
            var jobsCreated = await _jobScheduler.ScheduleImportJobsAsync(nameFilter);

            _logger.LogInformation("ScheduleImportJobs: Created {Count} import jobs", jobsCreated);

            return Ok(new
            {
                success = true,
                jobsCreated,
                message = $"Successfully scheduled {jobsCreated} import jobs"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "ScheduleImportJobs: Error scheduling import jobs");
            return BadRequest(ex.ToString());
        }
    }

    [HttpPost]
    [Route("schedule/processes/{apiKey}")]
    [AllowAnonymous]
    public async Task<IActionResult> ScheduleProcessJobs(string apiKey)
    {
        if (apiKey != _configuration["apiKey"])
        {
            _logger.LogWarning("ScheduleProcessJobs: Unauthorized request with apiKey {ApiKey}", apiKey);
            return Unauthorized();
        }

        try
        {
            var jobsCreated = await _jobScheduler.ScheduleProcessJobsAsync();

            _logger.LogInformation("ScheduleProcessJobs: Created {Count} process jobs", jobsCreated);

            return Ok(new
            {
                success = true,
                jobsCreated,
                message = $"Successfully scheduled {jobsCreated} process jobs"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "ScheduleProcessJobs: Error scheduling process jobs");
            return BadRequest(ex.ToString());
        }
    }

    [HttpPost]
    [Route("{id:guid}/retry")]
    public async Task<IActionResult> RetryJob(Guid id)
    {
        try
        {
            var job = await _db.QueueJobs.FirstOrDefaultAsync(j => j.Id == id);

            if (job == null)
            {
                _logger.LogWarning("RetryJob: Job {JobId} not found", id);
                return NotFound("Job not found");
            }

            if (job.Status != JobStatus.Failed)
            {
                _logger.LogWarning("RetryJob: Job {JobId} is not in Failed status (current: {Status})", id, job.Status);
                return BadRequest($"Job is not in Failed status (current: {job.Status})");
            }

            job.Status = JobStatus.Pending;
            job.RetryCount = 0;
            job.LastError = null;
            job.ModifiedAtUtc = DateTime.UtcNow;

            await _db.SaveChangesAsync();

            _logger.LogInformation("RetryJob: Job {JobId} reset to Pending status", id);

            return Ok(new
            {
                success = true,
                message = "Job reset to Pending status and will be retried"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "RetryJob: Error retrying job {JobId}", id);
            return BadRequest(ex.ToString());
        }
    }

    [HttpDelete]
    [Route("{id:guid}")]
    public async Task<IActionResult> CancelJob(Guid id)
    {
        try
        {
            var job = await _db.QueueJobs.FirstOrDefaultAsync(j => j.Id == id);

            if (job == null)
            {
                _logger.LogWarning("CancelJob: Job {JobId} not found", id);
                return NotFound("Job not found");
            }

            if (job.Status == JobStatus.Running)
            {
                _logger.LogWarning("CancelJob: Cannot cancel running job {JobId}", id);
                return BadRequest("Cannot cancel a job that is currently running");
            }

            if (job.Status == JobStatus.Completed)
            {
                _logger.LogWarning("CancelJob: Cannot cancel completed job {JobId}", id);
                return BadRequest("Cannot cancel a completed job");
            }

            job.Status = JobStatus.Failed;
            job.LastError = "Cancelled by user";
            job.ModifiedAtUtc = DateTime.UtcNow;

            await _db.SaveChangesAsync();

            _logger.LogInformation("CancelJob: Job {JobId} cancelled", id);

            return Ok(new
            {
                success = true,
                message = "Job cancelled successfully"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "CancelJob: Error cancelling job {JobId}", id);
            return BadRequest(ex.ToString());
        }
    }

    [HttpGet]
    [Route("stats")]
    public async Task<IActionResult> GetStats()
    {
        try
        {
            var stats = new
            {
                pending = await _db.QueueJobs.CountAsync(j => j.Status == JobStatus.Pending),
                running = await _db.QueueJobs.CountAsync(j => j.Status == JobStatus.Running),
                completed = await _db.QueueJobs.CountAsync(j => j.Status == JobStatus.Completed),
                failed = await _db.QueueJobs.CountAsync(j => j.Status == JobStatus.Failed),
                retrying = await _db.QueueJobs.CountAsync(j => j.Status == JobStatus.Retrying),
                total = await _db.QueueJobs.CountAsync()
            };

            _logger.LogDebug("GetStats: Retrieved job statistics");

            return Ok(stats);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "GetStats: Error retrieving job statistics");
            return BadRequest(ex.ToString());
        }
    }
}