using AutoMapper;
using GreenHome.Application;
using Microsoft.EntityFrameworkCore;

namespace GreenHome.Infrastructure;

public sealed class ChecklistService : IChecklistService
{
    private readonly GreenHomeDbContext _context;
    private readonly IMapper _mapper;

    public ChecklistService(GreenHomeDbContext context, IMapper mapper)
    {
        _context = context;
        _mapper = mapper;
    }

    public async Task<ChecklistDto?> GetActiveChecklistByDeviceIdAsync(int deviceId, CancellationToken cancellationToken)
    {
        var checklist = await _context.Checklists
            .Include(c => c.Device)
            .Include(c => c.CreatedByUser)
            .Include(c => c.Items.OrderBy(i => i.Order))
            .AsNoTracking()
            .FirstOrDefaultAsync(c => c.DeviceId == deviceId && c.IsActive, cancellationToken);

        return checklist != null ? _mapper.Map<ChecklistDto>(checklist) : null;
    }

    public async Task<List<ChecklistDto>> GetChecklistsByDeviceIdAsync(int deviceId, CancellationToken cancellationToken)
    {
        var checklists = await _context.Checklists
            .Include(c => c.Device)
            .Include(c => c.CreatedByUser)
            .Include(c => c.Items.OrderBy(i => i.Order))
            .AsNoTracking()
            .Where(c => c.DeviceId == deviceId)
            .OrderByDescending(c => c.IsActive)
            .ThenByDescending(c => c.CreatedAt)
            .ToListAsync(cancellationToken);

        return _mapper.Map<List<ChecklistDto>>(checklists);
    }

    public async Task<ChecklistDto?> GetChecklistByIdAsync(int id, CancellationToken cancellationToken)
    {
        var checklist = await _context.Checklists
            .Include(c => c.Device)
            .Include(c => c.CreatedByUser)
            .Include(c => c.Items.OrderBy(i => i.Order))
            .AsNoTracking()
            .FirstOrDefaultAsync(c => c.Id == id, cancellationToken);

        return checklist != null ? _mapper.Map<ChecklistDto>(checklist) : null;
    }

    public async Task<int> CreateChecklistAsync(CreateChecklistRequest request, CancellationToken cancellationToken)
    {
        // Deactivate existing active checklist for this device
        var existingActiveChecklist = await _context.Checklists
            .FirstOrDefaultAsync(c => c.DeviceId == request.DeviceId && c.IsActive, cancellationToken);

        if (existingActiveChecklist != null)
        {
            existingActiveChecklist.IsActive = false;
        }

        // Create new checklist
        var checklist = new Domain.Checklist
        {
            DeviceId = request.DeviceId,
            CreatedByUserId = request.CreatedByUserId,
            Title = request.Title,
            Description = request.Description,
            IsActive = true,
            CreatedAt = DateTime.UtcNow
        };

        // Add items
        foreach (var itemRequest in request.Items)
        {
            var item = new Domain.ChecklistItem
            {
                Title = itemRequest.Title,
                Description = itemRequest.Description,
                Order = itemRequest.Order,
                IsRequired = itemRequest.IsRequired
            };
            checklist.Items.Add(item);
        }

        _context.Checklists.Add(checklist);
        await _context.SaveChangesAsync(cancellationToken);

        return checklist.Id;
    }

    public async Task<List<ChecklistCompletionDto>> GetCompletionsByChecklistIdAsync(
        int checklistId,
        CancellationToken cancellationToken)
    {
        var completions = await _context.ChecklistCompletions
            .Include(cc => cc.Checklist)
            .Include(cc => cc.CompletedByUser)
            .Include(cc => cc.ItemCompletions)
                .ThenInclude(ic => ic.ChecklistItem)
            .AsNoTracking()
            .Where(cc => cc.ChecklistId == checklistId)
            .OrderByDescending(cc => cc.CompletedAt)
            .ToListAsync(cancellationToken);

        return _mapper.Map<List<ChecklistCompletionDto>>(completions);
    }

    public async Task<int> CompleteChecklistAsync(CompleteChecklistRequest request, CancellationToken cancellationToken)
    {
        var checklist = await _context.Checklists
            .Include(c => c.Items)
            .FirstOrDefaultAsync(c => c.Id == request.ChecklistId, cancellationToken);

        if (checklist == null)
        {
            throw new InvalidOperationException($"چک‌لیست با شناسه {request.ChecklistId} یافت نشد");
        }

        var completion = new Domain.ChecklistCompletion
        {
            ChecklistId = request.ChecklistId,
            CompletedByUserId = request.CompletedByUserId,
            PersianDate = request.PersianDate,
            Notes = request.Notes,
            CompletedAt = DateTime.UtcNow
        };

        foreach (var itemCompletion in request.ItemCompletions)
        {
            var item = new Domain.ChecklistItemCompletion
            {
                ChecklistItemId = itemCompletion.ChecklistItemId,
                IsChecked = itemCompletion.IsChecked,
                Note = itemCompletion.Note
            };
            completion.ItemCompletions.Add(item);
        }

        _context.ChecklistCompletions.Add(completion);
        await _context.SaveChangesAsync(cancellationToken);

        return completion.Id;
    }
}