using CampusErrand.Data;
using CampusErrand.Models;
using CampusErrand.Models.Dtos;
using CampusErrand.Helpers;
using CampusErrand.Services;
using Microsoft.EntityFrameworkCore;

namespace CampusErrand.Endpoints;

public static class EarningEndpoints
{
    public static void MapEarningEndpoints(this WebApplication app)
    {
        // 获取收益概览（四种金额状态）
        app.MapGet("/api/earnings", async (HttpContext httpContext, AppDbContext db) =>
        {
            var userIdClaim = httpContext.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier);
            if (userIdClaim == null) return Results.Unauthorized();
            var userId = int.Parse(userIdClaim.Value);

            // 先执行冻结解冻逻辑
            await BusinessHelpers.UnfreezeEarnings(db);

            var earnings = await db.Earnings.Where(e => e.UserId == userId).ToListAsync();

            var overview = new EarningsOverviewResponse
            {
                FrozenAmount = earnings.Where(e => e.Status == EarningStatus.Frozen).Sum(e => e.NetEarning),
                AvailableAmount = earnings.Where(e => e.Status == EarningStatus.Available).Sum(e => e.NetEarning),
                WithdrawingAmount = earnings.Where(e => e.Status == EarningStatus.Withdrawing).Sum(e => e.NetEarning),
                WithdrawnAmount = earnings.Where(e => e.Status == EarningStatus.Withdrawn).Sum(e => e.NetEarning)
            };

            return Results.Ok(overview);
        }).RequireAuthorization();

        // 获取收益记录
        app.MapGet("/api/earnings/records", async (HttpContext httpContext, AppDbContext db) =>
        {
            var userIdClaim = httpContext.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier);
            if (userIdClaim == null) return Results.Unauthorized();
            var userId = int.Parse(userIdClaim.Value);

            var records = await db.Earnings
                .Where(e => e.UserId == userId)
                .Include(e => e.Order)
                .OrderByDescending(e => e.CreatedAt)
                .Select(e => new EarningRecordResponse
                {
                    Id = e.Id,
                    OrderId = e.OrderId,
                    OrderNo = e.Order != null ? e.Order.OrderNo : "",
                    OrderType = e.Order != null ? e.Order.OrderType.ToString() : "",
                    GoodsAmount = e.GoodsAmount,
                    Commission = e.Commission,
                    PlatformFee = e.PlatformFee,
                    NetEarning = e.NetEarning,
                    Status = e.Status.ToString(),
                    CompletedAt = e.Order != null ? e.Order.CompletedAt : null,
                    CreatedAt = e.CreatedAt
                })
                .ToListAsync();

            return Results.Ok(records);
        }).RequireAuthorization();

        // 获取提现记录
        app.MapGet("/api/earnings/withdrawals", async (HttpContext httpContext, AppDbContext db) =>
        {
            var userIdClaim = httpContext.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier);
            if (userIdClaim == null) return Results.Unauthorized();
            var userId = int.Parse(userIdClaim.Value);

            var withdrawals = await db.Withdrawals
                .Where(w => w.UserId == userId)
                .OrderByDescending(w => w.CreatedAt)
                .Select(w => new WithdrawalRecordResponse
                {
                    Id = w.Id,
                    Amount = w.Amount,
                    PaymentMethod = w.PaymentMethod.ToString(),
                    Status = w.Status.ToString(),
                    CreatedAt = w.CreatedAt
                })
                .ToListAsync();

            return Results.Ok(withdrawals);
        }).RequireAuthorization();

        // 申请提现
        app.MapPost("/api/earnings/withdraw", async (WithdrawRequest request, HttpContext httpContext, AppDbContext db) =>
        {
            var userIdClaim = httpContext.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier);
            if (userIdClaim == null) return Results.Unauthorized();
            var userId = int.Parse(userIdClaim.Value);

            // 金额校验：读取最低提现金额配置
            var minWithdrawalConfig = await db.SystemConfigs.FirstOrDefaultAsync(c => c.Key == "min_withdrawal");
            var minWithdrawal = 1.0m;
            if (minWithdrawalConfig != null && decimal.TryParse(minWithdrawalConfig.Value, out var configMinW))
                minWithdrawal = configMinW;

            if (request.Amount < minWithdrawal)
                return Results.BadRequest(new { code = 400, message = $"提现金额不能低于{minWithdrawal}元" });

            // 金额校验：小数点后最多 2 位
            if (request.Amount != Math.Round(request.Amount, 2))
                return Results.BadRequest(new { code = 400, message = "请输入正确的提现金额" });

            // 收款方式默认微信零钱
            var paymentMethod = PaymentMethod.WeChat;
            if (!string.IsNullOrEmpty(request.PaymentMethod))
                Enum.TryParse<PaymentMethod>(request.PaymentMethod, true, out paymentMethod);

            // 先执行冻结解冻逻辑
            await BusinessHelpers.UnfreezeEarnings(db);

            // 计算可提现余额
            var availableAmount = await db.Earnings
                .Where(e => e.UserId == userId && e.Status == EarningStatus.Available)
                .SumAsync(e => e.NetEarning);

            if (request.Amount > availableAmount)
                return Results.BadRequest(new { code = 400, message = "超出可提现范围" });

            // 创建提现记录
            var withdrawal = new Withdrawal
            {
                UserId = userId,
                Amount = request.Amount,
                PaymentMethod = paymentMethod,
                QrCodeImage = request.QrCodeImage,
                Status = WithdrawalStatus.Pending,
                CreatedAt = DateTime.UtcNow
            };
            db.Withdrawals.Add(withdrawal);

            // 将对应金额的收益标记为提现中（按创建时间先进先出）
            var remainingAmount = request.Amount;
            var availableEarnings = await db.Earnings
                .Where(e => e.UserId == userId && e.Status == EarningStatus.Available)
                .OrderBy(e => e.CreatedAt)
                .ToListAsync();

            foreach (var earning in availableEarnings)
            {
                if (remainingAmount <= 0) break;

                if (earning.NetEarning <= remainingAmount)
                {
                    earning.Status = EarningStatus.Withdrawing;
                    remainingAmount -= earning.NetEarning;
                }
                else
                {
                    // 需要拆分收益记录：部分提现
                    earning.Status = EarningStatus.Withdrawing;
                    var originalNet = earning.NetEarning;
                    earning.NetEarning = remainingAmount;

                    // 创建剩余部分的新收益记录
                    var remainingEarning = new Earning
                    {
                        UserId = earning.UserId,
                        OrderId = earning.OrderId,
                        GoodsAmount = earning.GoodsAmount,
                        Commission = earning.Commission,
                        PlatformFee = 0,
                        NetEarning = originalNet - remainingAmount,
                        Status = EarningStatus.Available,
                        FrozenUntil = earning.FrozenUntil,
                        CreatedAt = earning.CreatedAt
                    };
                    db.Earnings.Add(remainingEarning);
                    remainingAmount = 0;
                }
            }

            await db.SaveChangesAsync();

            return Results.Created($"/api/earnings/withdrawals/{withdrawal.Id}", new WithdrawalRecordResponse
            {
                Id = withdrawal.Id,
                Amount = withdrawal.Amount,
                PaymentMethod = withdrawal.PaymentMethod.ToString(),
                Status = withdrawal.Status.ToString(),
                CreatedAt = withdrawal.CreatedAt
            });
        }).RequireAuthorization();

        // 管理端获取提现列表
        app.MapGet("/api/admin/withdrawals", async (string? status, AppDbContext db) =>
        {
            var query = db.Withdrawals
                .Include(w => w.User)
                .AsQueryable();

            if (!string.IsNullOrEmpty(status) && Enum.TryParse<WithdrawalStatus>(status, out var s))
                query = query.Where(w => w.Status == s);

            var list = await query
                .OrderByDescending(w => w.CreatedAt)
                .Select(w => new
                {
                    w.Id,
                    w.UserId,
                    UserNickname = w.User!.Nickname ?? ("用户" + w.UserId),
                    w.Amount,
                    PaymentMethod = w.PaymentMethod.ToString(),
                    w.QrCodeImage,
                    Status = w.Status.ToString(),
                    w.CreatedAt,
                    w.ProcessedAt
                })
                .ToListAsync();

            return Results.Ok(list);
        }).RequireAuthorization("AdminOnly");

        // 管理端审核提现（通过/拒绝）
        app.MapPut("/api/admin/withdrawals/{id}", async (int id, AdminWithdrawalRequest request, AppDbContext db, WxPayService wxPay) =>
        {
            var withdrawal = await db.Withdrawals.FindAsync(id);
            if (withdrawal == null)
                return Results.NotFound(new { code = 404, message = "提现记录不存在" });

            if (withdrawal.Status != WithdrawalStatus.Pending && withdrawal.Status != WithdrawalStatus.Processing)
                return Results.BadRequest(new { code = 400, message = "该提现记录已处理完毕" });

            if (request.Action == "approve")
            {
                // 先调用微信商家转账到零钱
                var user = await db.Users.FindAsync(withdrawal.UserId);
                if (user == null || string.IsNullOrEmpty(user.OpenId))
                    return Results.BadRequest(new { code = 400, message = "用户信息异常，无法转账" });

                var amountFen = (int)(withdrawal.Amount * 100);
                var batchNo = $"W{withdrawal.Id}_{DateTime.UtcNow:yyyyMMddHHmmss}";
                var detailNo = $"D{withdrawal.Id}_{DateTime.UtcNow:yyyyMMddHHmmss}";
                var (transferSuccess, transferError) = await wxPay.TransferToWallet(batchNo, detailNo, user.OpenId, amountFen, "跑腿提现到账");

                if (!transferSuccess)
                {
                    Console.WriteLine($"[提现] 转账失败: {transferError}");
                    return Results.BadRequest(new { code = 400, message = $"转账失败，请稍后重试", detail = transferError });
                }

                withdrawal.Status = WithdrawalStatus.Completed;
                withdrawal.ProcessedAt = DateTime.UtcNow;

                // 将对应收益标记为已提现
                var earnings = await db.Earnings
                    .Where(e => e.UserId == withdrawal.UserId && e.Status == EarningStatus.Withdrawing)
                    .OrderBy(e => e.CreatedAt)
                    .ToListAsync();

                var remaining = withdrawal.Amount;
                foreach (var earning in earnings)
                {
                    if (remaining <= 0) break;
                    if (earning.NetEarning <= remaining)
                    {
                        earning.Status = EarningStatus.Withdrawn;
                        remaining -= earning.NetEarning;
                    }
                    else
                    {
                        earning.Status = EarningStatus.Withdrawn;
                        remaining = 0;
                    }
                }
            }
            else if (request.Action == "reject")
            {
                withdrawal.Status = WithdrawalStatus.Pending;
                withdrawal.ProcessedAt = DateTime.UtcNow;

                // 将对应收益退回待提现状态
                var earnings = await db.Earnings
                    .Where(e => e.UserId == withdrawal.UserId && e.Status == EarningStatus.Withdrawing)
                    .OrderBy(e => e.CreatedAt)
                    .ToListAsync();

                var remaining = withdrawal.Amount;
                foreach (var earning in earnings)
                {
                    if (remaining <= 0) break;
                    if (earning.NetEarning <= remaining)
                    {
                        earning.Status = EarningStatus.Available;
                        remaining -= earning.NetEarning;
                    }
                    else
                    {
                        earning.Status = EarningStatus.Available;
                        remaining = 0;
                    }
                }

                // 拒绝后将提现记录状态设为特殊标记（复用 Pending 但已有 ProcessedAt）
                // 实际上拒绝后应该删除或标记，这里直接删除提现记录
                db.Withdrawals.Remove(withdrawal);
            }
            else if (request.Action == "processing")
            {
                withdrawal.Status = WithdrawalStatus.Processing;
            }
            else
            {
                return Results.BadRequest(new { code = 400, message = "无效操作，可选: approve, reject, processing" });
            }

            await db.SaveChangesAsync();
            return Results.Ok(new { message = "操作成功" });
        }).RequireAuthorization("AdminOnly");

        // 获取佣金规则
        app.MapGet("/api/admin/commission-rules", async (AppDbContext db) =>
        {
            var rules = await db.CommissionRules
                .OrderBy(r => r.MinAmount)
                .ToListAsync();
            return Results.Ok(rules);
        }).RequireAuthorization("AdminOnly");

        // 更新佣金规则
        app.MapPut("/api/admin/commission-rules", async (List<CommissionRule> rules, AppDbContext db) =>
        {
            // 清除旧规则
            var existing = await db.CommissionRules.ToListAsync();
            db.CommissionRules.RemoveRange(existing);

            // 添加新规则
            foreach (var rule in rules)
            {
                db.CommissionRules.Add(new CommissionRule
                {
                    MinAmount = rule.MinAmount,
                    MaxAmount = rule.MaxAmount,
                    RateType = rule.RateType,
                    Rate = rule.Rate
                });
            }

            await db.SaveChangesAsync();
            return Results.Ok(await db.CommissionRules.OrderBy(r => r.MinAmount).ToListAsync());
        }).RequireAuthorization("AdminOnly");
    }
}