using Data.SeaHavenIndustries;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Interfaces;

namespace SeaHaven.DataServices.Implementation
{
    public class DispatchDataService : IDispatchDataService
    {
        private readonly ApplicationDbContext _context;

        public DispatchDataService(ApplicationDbContext context)
        {
            _context = context;
        }

        public async Task<Dispatch?> GetByIdAsync(int id)
        {
            return await _context.Dispatches.FindAsync(id);
        }

        public async Task<Dispatch?> GetByIdWithDetailsAsync(int id)
        {
            return await _context.Dispatches
                .Include(d => d.Vendor)
                .FirstOrDefaultAsync(d => d.Id == id);
        }

        public async Task<IEnumerable<Dispatch>> GetAllAsync()
        {
            return await _context.Dispatches.ToListAsync();
        }

        public async Task<IEnumerable<Dispatch>> GetByVendorIdAsync(int vendorId)
        {
            return await _context.Dispatches
                .Where(d => d.VendorId == vendorId)
                .ToListAsync();
        }

        public async Task<IEnumerable<Dispatch>> GetByStatusAsync(string status)
        {
            return await _context.Dispatches
                .Where(d => d.Status == status)
                .ToListAsync();
        }

        public async Task<(IEnumerable<Dispatch> Items, int TotalCount)> GetPagedAsync(
            int page, 
            int pageSize, 
            string? search = null, 
            string? status = null)
        {
            var query = _context.Dispatches.AsQueryable();

            if (!string.IsNullOrWhiteSpace(search))
            {
                query = query.Where(d => d.DispatchNumber!.Contains(search));
            }

            if (!string.IsNullOrWhiteSpace(status))
            {
                query = query.Where(d => d.Status == status);
            }

            var totalCount = await query.CountAsync();
            var items = await query
                .OrderByDescending(d => d.CreatedDate)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync();

            return (items, totalCount);
        }

        public async Task<Dispatch> AddAsync(Dispatch dispatch)
        {
            dispatch.CreatedDate = DateTime.Now;
            await _context.Dispatches.AddAsync(dispatch);
            await _context.SaveChangesAsync();
            return dispatch;
        }

        public async Task UpdateAsync(Dispatch dispatch)
        {
            dispatch.LastModificationTime = DateTime.Now;
            _context.Dispatches.Update(dispatch);
            await _context.SaveChangesAsync();
        }

        public async Task DeleteAsync(int id)
        {
            var entity = await GetByIdAsync(id);
            if (entity != null)
            {
                _context.Dispatches.Remove(entity);
                await _context.SaveChangesAsync();
            }
        }

        public async Task<bool> ExistsAsync(int id)
        {
            return await _context.Dispatches.AnyAsync(d => d.Id == id);
        }

        public async Task<string> GenerateNextDispatchNumberAsync()
        {
            return await Task.FromResult($"DISP-{DateTime.Now:yyyyMMdd}-{new Random().Next(1000, 9999)}");
        }

        public async Task<int> CountAsync()
        {
            return await _context.Dispatches.CountAsync();
        }
    }
}