using AgriculturalPlatform.Api.Data;
using AgriculturalPlatform.Api.Dtos;
using AgriculturalPlatform.Api.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace AgriculturalPlatform.Api.Controllers;

[ApiController]
[Route("api/products")]
[Authorize]
public class ProductsController(AppDbContext db) : ControllerBase
{
    /// <summary>品种列表（可选品类/关键字）</summary>
    [HttpGet]
    public async Task<ActionResult> List(string? category, string? keyword)
    {
        var query = db.Products.AsQueryable();
        if (!string.IsNullOrWhiteSpace(category))
            query = query.Where(p => p.Category == category);
        if (!string.IsNullOrWhiteSpace(keyword))
            query = query.Where(p => p.Name.Contains(keyword) || p.Category.Contains(keyword));
        var items = await query.OrderBy(p => p.Category).ThenBy(p => p.Name).ToListAsync();
        return Ok(items.ToDtos());
    }

    /// <summary>品类列表（筛选用）</summary>
    [HttpGet("categories")]
    public async Task<ActionResult> Categories()
    {
        var items = await db.Products.Select(p => p.Category).Distinct().OrderBy(c => c).ToListAsync();
        return Ok(items);
    }

    [HttpPost]
    public async Task<ActionResult<ProductDto>> Create(ProductSaveRequest req)
    {
        if (await db.Products.AnyAsync(p => p.Name == req.Name))
            return BadRequest(new { message = "品种名称已存在" });
        var product = new Product
        {
            Name = req.Name, Category = req.Category, Unit = req.Unit,
            Spec = req.Spec, Price = req.Price
        };
        if (Enum.TryParse<ProductStatus>(req.Status, out var status)) product.Status = status;
        db.Products.Add(product);
        await db.SaveChangesAsync();
        return Ok(product.ToDto());
    }

    [HttpPut("{id:int}")]
    public async Task<ActionResult<ProductDto>> Update(int id, ProductSaveRequest req)
    {
        var product = await db.Products.FindAsync(id);
        if (product is null) return NotFound();
        if (req.Name != product.Name && await db.Products.AnyAsync(p => p.Name == req.Name))
            return BadRequest(new { message = "品种名称已存在" });

        product.Name = req.Name; product.Category = req.Category; product.Unit = req.Unit;
        product.Spec = req.Spec; product.Price = req.Price;
        if (Enum.TryParse<ProductStatus>(req.Status, out var status)) product.Status = status;
        await db.SaveChangesAsync();
        return Ok(product.ToDto());
    }

    [HttpDelete("{id:int}")]
    public async Task<IActionResult> Delete(int id)
    {
        var product = await db.Products.FindAsync(id);
        if (product is null) return NotFound();
        if (await db.PurchaseOrders.AnyAsync(p => p.ProductId == id))
            return BadRequest(new { message = "该品种已有收购记录，无法删除" });
        db.Products.Remove(product);
        await db.SaveChangesAsync();
        return Ok(new { message = "删除成功" });
    }
}