using AVSCartonShipmentVerifier.DTOs;
using AVSCartonShipmentVerifier.Repositories;
using AVSCartonShipmentVerifier.Services;
using Microsoft.AspNetCore.Mvc;

namespace AVSCartonShipmentVerifier.Controllers;

[Route("api/verification")]
public sealed class VerificationController(
    IShipmentVerificationService shipmentVerificationService,
    IScanHistoryStore scanHistoryStore,
    ICartonVerificationRepository cartonVerificationRepository,
    IMovementAnalyticsService movementAnalyticsService,
    ILogger<VerificationController> logger) : Controller
{
    private readonly IShipmentVerificationService _shipmentVerificationService = shipmentVerificationService;
    private readonly IScanHistoryStore _scanHistoryStore = scanHistoryStore;
    private readonly ICartonVerificationRepository _cartonVerificationRepository = cartonVerificationRepository;
    private readonly IMovementAnalyticsService _movementAnalyticsService = movementAnalyticsService;
    private readonly ILogger<VerificationController> _logger = logger;

    [HttpPost("scan")]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Scan([FromBody] QrScanRequestDto request, CancellationToken cancellationToken)
    {
        if (request is null)
        {
            return BadRequest(new { message = "Request payload is required." });
        }

        try
        {
            var verificationResult = await _shipmentVerificationService.VerifyQrAsync(
                request.QrValue,
                request.EntryMethod ?? "Scanner",
                cancellationToken);

            var availableCartons = await TryGetAvailableCartonCountAsync(cancellationToken);

            return Ok(new
            {
                result = verificationResult,
                recentSuccessfulScans = await _scanHistoryStore.GetLastFiveSuccessfulScansAsync(cancellationToken),
                recentRejectedScans = await _scanHistoryStore.GetLastFiveRejectedScansAsync(cancellationToken),
                availableCartons
            });
        }
        catch (OperationCanceledException)
        {
            return StatusCode(StatusCodes.Status499ClientClosedRequest);
        }
        catch (Exception exception)
        {
            _logger.LogError(exception, "Unexpected error while verifying QR scan.");

            return StatusCode(StatusCodes.Status500InternalServerError, new
            {
                message = "An unexpected error occurred during verification."
            });
        }
    }

    [HttpGet("dashboard-summary")]
    public async Task<IActionResult> GetDashboardSummary(CancellationToken cancellationToken)
    {
        var count = await TryGetAvailableCartonCountAsync(cancellationToken);
        if (count is null)
        {
            return StatusCode(StatusCodes.Status503ServiceUnavailable, new { message = "Unable to load available cartons count." });
        }

        return Ok(new { availableCartons = count.Value });
    }

    [HttpGet("available-cartons")]
    public async Task<IActionResult> GetAvailableCartons(CancellationToken cancellationToken)
    {
        var count = await TryGetAvailableCartonCountAsync(cancellationToken);
        if (count is null)
        {
            return StatusCode(StatusCodes.Status503ServiceUnavailable, new { message = "Unable to load available cartons count." });
        }

        return Ok(new { availableCartons = count.Value });
    }

    [HttpGet("movement-analytics")]
    public async Task<IActionResult> GetMovementAnalytics(
        [FromQuery] DateOnly? from,
        [FromQuery] DateOnly? to,
        CancellationToken cancellationToken)
    {
        var today = DateOnly.FromDateTime(DateTime.Now);
        var toDate = to ?? today;
        var fromDate = from ?? toDate.AddDays(-6);

        try
        {
            var analytics = await _movementAnalyticsService.GetAnalyticsAsync(fromDate, toDate, cancellationToken);
            return Ok(analytics);
        }
        catch (Exception exception)
        {
            _logger.LogError(exception, "Unexpected error while loading movement analytics.");
            return StatusCode(StatusCodes.Status500InternalServerError, new { message = "Unable to load movement analytics." });
        }
    }

    /// <summary>
    /// Returns all successful or all rejected scan records from SQLite (not limited to five).
    /// </summary>
    [HttpGet("history")]
    public async Task<IActionResult> GetFullHistory([FromQuery] string category = "successful", CancellationToken cancellationToken = default)
    {
        var normalized = category.Trim().ToLowerInvariant();
        try
        {
            if (normalized == "successful")
            {
                var records = await _scanHistoryStore.GetAllSuccessfulScansAsync(cancellationToken);
                return Ok(new { category = "successful", records });
            }

            if (normalized == "rejected")
            {
                var records = await _scanHistoryStore.GetAllRejectedScansAsync(cancellationToken);
                return Ok(new { category = "rejected", records });
            }

            return BadRequest(new { message = "Invalid category. Use 'successful' or 'rejected'." });
        }
        catch (Exception exception)
        {
            _logger.LogError(exception, "Unexpected error while loading scan history.");
            return StatusCode(StatusCodes.Status500InternalServerError, new { message = "Unable to load scan history." });
        }
    }

    private async Task<int?> TryGetAvailableCartonCountAsync(CancellationToken cancellationToken)
    {
        try
        {
            return await _cartonVerificationRepository.GetAvailableCartonCountAsync(cancellationToken);
        }
        catch (Exception exception)
        {
            _logger.LogWarning(exception, "Failed to load available cartons count from verification database.");
            return null;
        }
    }
}