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/farmers")]
[Authorize]
public class FarmersController(AppDbContext db) : ControllerBase
{
    /// <summary>农户列表（分页/关键字/地区筛选）</summary>
    [HttpGet]
    public async Task<ActionResult<PagedResult<FarmerDto>>> List(
        string? status, string? province, string? county, string? township, string? village,
        [FromQuery] int page = 1, [FromQuery] int pageSize = 20, [FromQuery] string? keyword = null)
    {
        var query = db.Farmers.AsQueryable();
        if (!string.IsNullOrWhiteSpace(status) && Enum.TryParse<FarmerStatus>(status, out var fs))
            query = query.Where(f => f.Status == fs);
        if (!string.IsNullOrWhiteSpace(province))
            query = query.Where(f => f.Province == province);
        if (!string.IsNullOrWhiteSpace(county))
            query = query.Where(f => f.County == county);
        if (!string.IsNullOrWhiteSpace(township))
            query = query.Where(f => f.Township == township);
        if (!string.IsNullOrWhiteSpace(village))
            query = query.Where(f => f.Village == village);
        if (!string.IsNullOrWhiteSpace(keyword))
            query = query.Where(f => f.Name.Contains(keyword)
                || f.Phone.Contains(keyword)
                || f.IdCard.Contains(keyword)
                || f.Village.Contains(keyword)
                || f.Province.Contains(keyword)
                || f.County.Contains(keyword)
                || f.Township.Contains(keyword)
                || f.GroupName.Contains(keyword));

        var total = await query.CountAsync();
        var items = await query.OrderByDescending(f => f.Id)
            .Skip((page - 1) * pageSize).Take(pageSize)
            .ToListAsync();
        return Ok(new PagedResult<FarmerDto>(items.ToDtos(), total));
    }

    /// <summary>全部农户（下拉选择用）</summary>
    [HttpGet("all")]
    public async Task<ActionResult> All(string? keyword, int limit = 50)
    {
        var query = db.Farmers.Where(f => f.Status == FarmerStatus.Active).AsQueryable();
        if (!string.IsNullOrWhiteSpace(keyword))
            query = query.Where(f => f.Name.Contains(keyword) || f.Phone.Contains(keyword) || f.IdCard.Contains(keyword));
        var items = await query.OrderByDescending(f => f.Id).Take(limit)
            .Select(f => new { f.Id, f.Name, f.Phone, f.Province, f.County, f.Township, f.Village, f.GroupName, f.IdCard }).ToListAsync();
        return Ok(items);
    }

    /// <summary>农户详情（含交易统计）</summary>
    [HttpGet("{id:int}")]
    public async Task<ActionResult> Get(int id)
    {
        var farmer = await db.Farmers.FindAsync(id);
        if (farmer is null) return NotFound();

        var totalAmount = await db.PurchaseOrders
            .Where(p => p.FarmerId == id && p.Status == PurchaseStatus.Completed)
            .SumAsync(p => (decimal?)p.Amount) ?? 0;
        var orderCount = await db.PurchaseOrders
            .CountAsync(p => p.FarmerId == id && p.Status == PurchaseStatus.Completed);
        var paidAmount = await db.PaymentRecords
            .Where(p => p.FarmerId == id && p.Status == PayStatus.Success)
            .SumAsync(p => (decimal?)p.Amount) ?? 0;

        var dto = farmer.ToDto();
        return Ok(new { farmer = dto, totalAmount, orderCount, paidAmount });
    }

    /// <summary>新增农户</summary>
    [HttpPost]
    public async Task<ActionResult<FarmerDto>> Create(FarmerSaveRequest req)
    {
        if (await db.Farmers.AnyAsync(f => f.IdCard == req.IdCard))
            return BadRequest(new { message = "该身份证号已存在" });
        if (!Enum.TryParse<FarmerStatus>(req.Status, out var status)) status = FarmerStatus.Active;

        var farmer = new Farmer
        {
            Name = req.Name, IdCard = req.IdCard, Gender = req.Gender, FarmerType = req.FarmerType,
            Phone = req.Phone,
            Province = req.Province, County = req.County, Township = req.Township,
            Village = req.Village, GroupName = req.GroupName,
            Address = req.Address,
            BankName = req.BankName, BankAccount = req.BankAccount,
            IdCardFrontUrl = req.IdCardFrontUrl, IdCardBackUrl = req.IdCardBackUrl,
            AvatarUrl = req.AvatarUrl,
            CreditScore = req.CreditScore, Status = status, Notes = req.Notes
        };
        db.Farmers.Add(farmer);
        await db.SaveChangesAsync();
        return Ok(farmer.ToDto());
    }

    /// <summary>修改农户</summary>
    [HttpPut("{id:int}")]
    public async Task<ActionResult<FarmerDto>> Update(int id, FarmerSaveRequest req)
    {
        var farmer = await db.Farmers.FindAsync(id);
        if (farmer is null) return NotFound();
        if (req.IdCard != farmer.IdCard && await db.Farmers.AnyAsync(f => f.IdCard == req.IdCard))
            return BadRequest(new { message = "该身份证号已存在" });

        farmer.Name = req.Name; farmer.IdCard = req.IdCard; farmer.Gender = req.Gender;
        farmer.FarmerType = req.FarmerType;
        farmer.Phone = req.Phone;
        farmer.Province = req.Province; farmer.County = req.County;
        farmer.Township = req.Township; farmer.Village = req.Village;
        farmer.GroupName = req.GroupName;
        farmer.Address = req.Address;
        farmer.BankName = req.BankName; farmer.BankAccount = req.BankAccount;
        farmer.IdCardFrontUrl = req.IdCardFrontUrl; farmer.IdCardBackUrl = req.IdCardBackUrl;
        farmer.AvatarUrl = req.AvatarUrl;
        farmer.CreditScore = req.CreditScore; farmer.Notes = req.Notes;
        if (Enum.TryParse<FarmerStatus>(req.Status, out var status)) farmer.Status = status;
        farmer.UpdatedAt = DateTime.Now;
        await db.SaveChangesAsync();
        return Ok(farmer.ToDto());
    }

    /// <summary>删除农户（存在收购记录时禁止删除，仅冻结）</summary>
    [HttpDelete("{id:int}")]
    public async Task<IActionResult> Delete(int id)
    {
        var farmer = await db.Farmers.FindAsync(id);
        if (farmer is null) return NotFound();
        if (await db.PurchaseOrders.AnyAsync(p => p.FarmerId == id))
        {
            farmer.Status = FarmerStatus.Frozen;
            await db.SaveChangesAsync();
            return Ok(new { message = "该农户已有收购记录，已将其状态置为冻结" });
        }
        db.Farmers.Remove(farmer);
        await db.SaveChangesAsync();
        return Ok(new { message = "删除成功" });
    }
}