using Distribution.Features.Stock;
using Distribution.Features.DriverComplianceConfig;
using Distribution.Features.DriverProfile;
using Distribution.Infra.UoW;
using Distribution.Models;

namespace Distribution.Features.Ride;

public class RideService(
    IRideRepository rideRepo,
    IDriverProfileRepository driverRepo,
    IDriverComplianceConfigRepository complianceRepo,
    StockMover mover,
    IUnitOfWork uow)
{
    public async Task<PagedResponse<RideResponse>> GetAllAsync(RideStatus? status, Guid? driverProfileId, Guid? vehicleId, int page, int pageSize)
    {
        var total = await rideRepo.GetCountAsync(status, driverProfileId, vehicleId);
        var items = await rideRepo.GetAllAsync(status, driverProfileId, vehicleId, page, pageSize);
        return new PagedResponse<RideResponse>(page, pageSize, total, items.Select(ToResponse).ToList());
    }

    public async Task<RideResponse?> GetByIdAsync(Guid id)
    {
        var ride = await rideRepo.GetByIdAsync(id);
        return ride is null ? null : ToResponse(ride);
    }

    public async Task<RideResponse> CreateAsync(CreateRideRequest request, CancellationToken ct = default)
    {
        if (await rideRepo.HasOpenRideForVehicleAsync(request.VehicleId))
            throw new InvalidOperationException("Vehicle already has an open ride");

        await CheckDriverComplianceAsync(request.DriverProfileId);

        var ride = new DeliveryRun
        {
            FK_VehicleId = request.VehicleId,
            FK_DriverProfileId = request.DriverProfileId,
            Status = RideStatus.Open,
            Meterstart = request.Meterstart,
            StartedAt = DateTime.Now
        };

        await uow.BeginAsync(ct);
        try
        {
            await rideRepo.AddAsync(ride);
            await uow.CommitAsync(ct);
        }
        catch { await uow.RollbackAsync(ct); throw; }

        var saved = await rideRepo.GetByIdAsync(ride.Id);
        return ToResponse(saved!);
    }

    public async Task<RideResponse> AssignDriverAsync(Guid rideId, Guid driverProfileId, CancellationToken ct = default)
    {
        var ride = await rideRepo.GetByIdAsync(rideId)
            ?? throw new KeyNotFoundException("Ride not found");

        if (ride.Status != RideStatus.Open)
            throw new InvalidOperationException("Driver can only be changed while the ride is Open");

        var driver = await driverRepo.GetByIdAsync(driverProfileId);
        if (driver is null || !driver.IsActive)
            throw new InvalidOperationException("Driver profile not found or inactive");

        ride.FK_DriverProfileId = driverProfileId;

        await uow.BeginAsync(ct);
        try { rideRepo.Update(ride); await uow.CommitAsync(ct); }
        catch { await uow.RollbackAsync(ct); throw; }

        var saved = await rideRepo.GetByIdAsync(rideId);
        return ToResponse(saved!);
    }

    public async Task<RideResponse> CloseAsync(Guid rideId, CloseRideRequest request, Guid userId, CancellationToken ct = default)
    {
        var ride = await rideRepo.GetByIdAsync(rideId)
            ?? throw new KeyNotFoundException("Ride not found");

        if (ride.Status != RideStatus.Open)
            throw new InvalidOperationException($"Cannot close a ride in {ride.Status} status");

        if (request.Meterend < ride.Meterstart)
            throw new InvalidOperationException($"Meter end ({request.Meterend}) cannot be less than meter start ({ride.Meterstart})");

        ride.Status = RideStatus.Closed;
        ride.ClosedAt = DateTime.Now;
        ride.Meterend = request.Meterend;

        // Whatever wasn't delivered goes back to the warehouse it was loaded from.
        await uow.BeginAsync(ct);
        try
        {
            await mover.UnloadVehicleAsync(ride.FK_VehicleId, ride.Id, userId, "RideClosed");
            rideRepo.Update(ride);
            await uow.CommitAsync(ct);
        }
        catch { await uow.RollbackAsync(ct); throw; }

        return ToResponse(ride);
    }

    public async Task<RideResponse> CancelAsync(Guid rideId, CancelRideRequest request, Guid userId, CancellationToken ct = default)
    {
        var ride = await rideRepo.GetByIdAsync(rideId)
            ?? throw new KeyNotFoundException("Ride not found");

        if (ride.Status != RideStatus.Open)
            throw new InvalidOperationException($"Cannot cancel a ride in {ride.Status} status");

        ride.Status = RideStatus.Cancelled;
        ride.CancelTypeCode = request.TypeCode;
        ride.CancelReason = request.Reason;

        await uow.BeginAsync(ct);
        try
        {
            await mover.UnloadVehicleAsync(ride.FK_VehicleId, ride.Id, userId, "RideCancelled");
            rideRepo.Update(ride);
            await uow.CommitAsync(ct);
        }
        catch { await uow.RollbackAsync(ct); throw; }

        return ToResponse(ride);
    }

    private async Task CheckDriverComplianceAsync(Guid driverProfileId)
    {
        var driver = await driverRepo.GetByIdAsync(driverProfileId)
            ?? throw new InvalidOperationException("Driver profile not found");

        if (!driver.IsActive)
            throw new InvalidOperationException("Driver profile is inactive");

        var config = await complianceRepo.GetAsync();
        if (config is null) return;

        var today = DateTime.Now.Date;

        if (config.EnforceLicenseExpiry && driver.LicenseExpiry.Date <= today)
            throw new InvalidOperationException("Driver license has expired");

        if (config.EnforceMedicalClearance && driver.MedicalClearanceExpiry.Date <= today)
            throw new InvalidOperationException("Driver medical clearance has expired");
    }

    private static RideResponse ToResponse(DeliveryRun r) =>
        new(r.Id, r.Status,
            r.FK_VehicleId, r.Vehicle?.NumberPlate ?? string.Empty,
            r.FK_DriverProfileId, r.DriverProfile?.User?.FullName ?? string.Empty,
            r.Meterstart, r.Meterend,
            r.StartedAt, r.ClosedAt, r.CancelTypeCode, r.CancelReason, r.CreatedAt);
}