using LogisticsApp.Server.Data;
using LogisticsApp.Server.DTOs;
using LogisticsApp.Server.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace LogisticsApp.Server.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class OrdersController : ControllerBase
    {
        private readonly ApplicationDbContext _context;

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

        // GET: api/orders
        [Authorize]
        [HttpGet]
        public async Task<ActionResult<ApiResponse<PagedResult<Order>>>> GetOrders([FromQuery] OrderFilters filters)
        {
            try
            {
                var query = _context.Orders.AsQueryable();

  
                if (!string.IsNullOrEmpty(filters.ClientName))
                {
                    query = query.Where(o => o.ClientName.ToLower().Contains(filters.ClientName.ToLower()));
                }

                if (filters.MinCost.HasValue)
                {
                    query = query.Where(o => o.OrderCost >= filters.MinCost.Value);
                }

                if (filters.MaxCost.HasValue)
                {
                    query = query.Where(o => o.OrderCost <= filters.MaxCost.Value);
                }

                if (filters.OrderDate.HasValue)
                {
                    query = query.Where(o => o.OrderDate.Date == filters.OrderDate.Value.Date);
                }

                if (!string.IsNullOrEmpty(filters.Status))
                {
                    query = query.Where(o => o.Status == filters.Status);
                }

                var totalCount = await query.CountAsync();

            
                var orders = await query
                    .OrderByDescending(o => o.OrderDate)
                    .Skip((filters.Page - 1) * filters.PageSize)
                    .Take(filters.PageSize)
                    .ToListAsync();

                var result = new PagedResult<Order>
                {
                    Items = orders,
                    TotalCount = totalCount,
                    Page = filters.Page,
                    PageSize = filters.PageSize,
                    TotalPages = (int)Math.Ceiling(totalCount / (double)filters.PageSize)
                };

                return Ok(new ApiResponse<PagedResult<Order>>(true, "Orders retrieved successfully", result));
            }
            catch (Exception ex)
            {
                return StatusCode(500, new ApiResponse<string>(false, $"Internal server error: {ex.Message}"));
            }
        }

        // GET: api/orders/5
        [Authorize]
        [HttpGet("{id}")]
        public async Task<ActionResult<ApiResponse<Order>>> GetOrder(int id)
        {
            var order = await _context.Orders.FindAsync(id);

            if (order == null)
            {
                return NotFound(new ApiResponse<string>(false, "Order not found"));
            }

            return Ok(new ApiResponse<Order>(true, "Order retrieved successfully", order));
        }

        // PUT: api/orders/5
        [Authorize]
        [HttpPut("{id}")]
        public async Task<ActionResult<ApiResponse<Order>>> PutOrder(int id, Order order)
        {
            if (id != order.Id)
            {
                return BadRequest(new ApiResponse<string>(false, "ID mismatch"));
            }

          
            var validStatuses = new[] { "pending", "in_progress", "completed", "cancelled" };
            if (!validStatuses.Contains(order.Status))
            {
                return BadRequest(new ApiResponse<string>(false, "Invalid status"));
            }

           
            if (order.OrderCost <= 0)
            {
                return BadRequest(new ApiResponse<string>(false, "Order cost must be positive"));
            }

          
            _context.Entry(order).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!OrderExists(id))
                {
                    return NotFound(new ApiResponse<string>(false, "Order not found"));
                }
                else
                {
                    throw;
                }
            }

            return Ok(new ApiResponse<Order>(true, "Order updated successfully", order));
        }

        // POST: api/orders
        [Authorize]
        [HttpPost]
        public async Task<ActionResult<ApiResponse<Order>>> PostOrder(Order order)
        {

            if (string.IsNullOrEmpty(order.ClientName) || order.ClientName.Length > 200)
            {
                return BadRequest(new ApiResponse<string>(false, "Client name is required and must be less than 200 characters"));
            }

            if (order.OrderCost <= 0)
            {
                return BadRequest(new ApiResponse<string>(false, "Order cost must be positive"));
            }

            if (string.IsNullOrEmpty(order.Address) || order.Address.Length > 500)
            {
                return BadRequest(new ApiResponse<string>(false, "Address is required and must be less than 500 characters"));
            }

            var validStatuses = new[] { "pending", "in_progress", "completed", "cancelled" };
            if (!validStatuses.Contains(order.Status))
            {
                return BadRequest(new ApiResponse<string>(false, "Invalid status"));
            }

            _context.Orders.Add(order);
            await _context.SaveChangesAsync();

            return CreatedAtAction("GetOrder", new { id = order.Id },
                new ApiResponse<Order>(true, "Order created successfully", order));
        }

        // DELETE: api/orders/5
        [Authorize]
        [HttpDelete("{id}")]
        public async Task<ActionResult<ApiResponse<Order>>> DeleteOrder(int id)
        {
            try
            {
                var order = await _context.Orders.FindAsync(id);
                if (order == null)
                {
                    return NotFound(new ApiResponse<string>(false, "Order not found"));
                }

                _context.Orders.Remove(order);
                await _context.SaveChangesAsync();

                return Ok(new ApiResponse<string>(true, "Order deleted successfully"));
            }
            catch (Exception ex)
            {
                return StatusCode(500, new ApiResponse<string>(false, $"Internal server error: {ex.Message}"));
            }
        }

        private bool OrderExists(int id)
        {
            return _context.Orders.Any(e => e.Id == id);
        }
    }
}