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

namespace SeaHaven.DataServices.Implementation
{
    public class FollowUpDataService : IFollowUpDataService
    {
        private readonly ApplicationDbContext _context;

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

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

        public async Task<FollowUps?> GetByIdWithDetailsAsync(int id)
        {
            return await _context.FollowUps
                .Include(x => x.Employee)
                .Include(x => x.Account)
                .Include(x => x.Location)
                // Removed .Include(x => x.WorkOrder) due to schema mismatch - WorkOrder has columns not in DB
                .FirstOrDefaultAsync(f => f.Id == id);
        }

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

        public async Task<IEnumerable<FollowUps>> GetByWorkOrderIdAsync(int workOrderId)
        {
            return await _context.FollowUps
                .Where(f => f.WorkOrderId == workOrderId)
                .ToListAsync();
        }

        public async Task<IEnumerable<FollowUps>> GetByUserIdAsync(string userId)
        {
            return await _context.FollowUps
                .Where(f => f.createdby == userId)
                .ToListAsync();
        }

        public async Task<(IEnumerable<FollowUps> Items, int TotalCount)> GetPagedAsync(
            int page,
            int pageSize,
            string? search = null,
            string? status = null)
        {
            search ??= "";
            status = string.IsNullOrWhiteSpace(status) ? "Open" : status;

            var query = _context.FollowUps
                .Include(x => x.Employee)
                .Include(x => x.Account)
                .Include(x => x.Location)
                // Removed .Include(x => x.WorkOrder) due to schema mismatch - WorkOrder has columns not in DB
                .Where(x => x.Status == status);

            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.ToLower();
                query = query.Where(x =>
                    (x.Reason ?? "").ToLower().Contains(s) ||
                    (x.Account != null && (x.Account.Name ?? "").ToLower().Contains(s)) ||
                    (x.Employee != null &&
                        (((x.Employee.FirstName ?? "") + " " + (x.Employee.LastName ?? ""))
                            .ToLower().Contains(s))
                    )
                );
            }

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

            return (items, totalCount);
        }

        public async Task<FollowUps> AddAsync(FollowUps followUp)
        {
            followUp.CreatedDate = DateTime.UtcNow;
            await _context.FollowUps.AddAsync(followUp);
            await _context.SaveChangesAsync();
            return followUp;
        }

        public async Task UpdateAsync(FollowUps followUp)
        {
            followUp.LastModificationTime = DateTime.UtcNow;
            _context.FollowUps.Update(followUp);
            await _context.SaveChangesAsync();
        }

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

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

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

        public async Task<List<FollowUps>> GetListPagedAsync(
            int page,
            int pageSize,
            string? search,
            string? status,
            CancellationToken cancellationToken)
        {
            search ??= "";
            status = string.IsNullOrWhiteSpace(status) ? "Open" : status;

            var query = _context.FollowUps
                .Include(x => x.Employee)
                .Include(x => x.Account)
                .Include(x => x.Location)
                .AsNoTracking()
                .Where(x => x.Status == status);

            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.ToLower();
                query = query.Where(x =>
                    (x.Reason ?? "").ToLower().Contains(s) ||
                    (x.Account != null && (x.Account.Name ?? "").ToLower().Contains(s)) ||
                    (x.Employee != null &&
                        (((x.Employee.FirstName ?? "") + " " + (x.Employee.LastName ?? ""))
                            .ToLower().Contains(s))
                    )
                );
            }

            return await query
                .OrderByDescending(f => f.Id)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync(cancellationToken);
        }

        public async Task<int> GetListTotalAsync(string? search, string? status, CancellationToken cancellationToken)
        {
            search ??= "";
            status = string.IsNullOrWhiteSpace(status) ? "Open" : status;

            var query = _context.FollowUps
                .AsNoTracking()
                .Where(x => x.Status == status);

            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.ToLower();
                query = query.Where(x =>
                    (x.Reason ?? "").ToLower().Contains(s) ||
                    (x.Account != null && (x.Account.Name ?? "").ToLower().Contains(s)) ||
                    (x.Employee != null &&
                        (((x.Employee.FirstName ?? "") + " " + (x.Employee.LastName ?? ""))
                            .ToLower().Contains(s))
                    )
                );
            }

            return await query.CountAsync(cancellationToken);
        }

        public async Task<FollowUps?> GetDetailByIdAsync(int id, CancellationToken cancellationToken)
        {
            return await _context.FollowUps
                .Include(x => x.Employee)
                .Include(x => x.Account)
                .Include(x => x.Location)
                .AsNoTracking()
                .FirstOrDefaultAsync(f => f.Id == id, cancellationToken);
        }

        public async Task<FollowUps?> GetByIdForUpdateAsync(int id, CancellationToken cancellationToken)
        {
            return await _context.FollowUps.FindAsync(new object[] { id }, cancellationToken);
        }

        public async Task<string> GetUserNameAsync(string? userId, CancellationToken cancellationToken)
        {
            if (string.IsNullOrEmpty(userId))
                return "";

            var u = await _context.Users
                .AsNoTracking()
                .Where(x => x.Id == userId)
                .Select(x => new { x.FirstName, x.LastName, x.UserName })
                .FirstOrDefaultAsync(cancellationToken);

            if (u == null)
                return "";

            var n = ((u.FirstName ?? "") + " " + (u.LastName ?? "")).Trim();
            return string.IsNullOrWhiteSpace(n) ? (u.UserName ?? "") : n;
        }

        public async Task<FollowUps> AddAsync(FollowUps followUp, CancellationToken cancellationToken)
        {
            followUp.CreatedDate = DateTime.UtcNow;
            await _context.FollowUps.AddAsync(followUp, cancellationToken);
            await _context.SaveChangesAsync(cancellationToken);
            return followUp;
        }

        public async Task UpdateAsync(FollowUps followUp, CancellationToken cancellationToken)
        {
            followUp.LastModificationTime = DateTime.UtcNow;
            _context.FollowUps.Update(followUp);
            await _context.SaveChangesAsync(cancellationToken);
        }

        public async Task<bool> SetStatusAsync(int id, string status, CancellationToken cancellationToken)
        {
            var entity = await _context.FollowUps.FindAsync(new object[] { id }, cancellationToken);
            if (entity == null)
                return false;

            entity.Status = status;
            entity.LastModificationTime = DateTime.UtcNow;
            await _context.SaveChangesAsync(cancellationToken);
            return true;
        }

        public async Task<bool> RemoveByIdAsync(int id, CancellationToken cancellationToken)
        {
            var entity = await _context.FollowUps.FindAsync(new object[] { id }, cancellationToken);
            if (entity == null)
                return false;

            _context.FollowUps.Remove(entity);
            await _context.SaveChangesAsync(cancellationToken);
            return true;
        }
    }
}