package admin

import (
	"strconv"

	"github.com/go-playground/validator/v10"
	"github.com/gofiber/fiber/v2"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	orderService "github.com/break/junhong_cmp_fiber/internal/service/order"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
	"github.com/break/junhong_cmp_fiber/pkg/response"
)

// OrderHandler 后台订单处理器
type OrderHandler struct {
	service   *orderService.Service
	validator *validator.Validate
}

// NewOrderHandler 创建后台订单处理器
func NewOrderHandler(service *orderService.Service, validator *validator.Validate) *OrderHandler {
	return &OrderHandler{service: service, validator: validator}
}

// Create 创建后台订单
// POST /api/admin/orders
func (h *OrderHandler) Create(c *fiber.Ctx) error {
	var req dto.CreateAdminOrderRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

	// 验证请求参数（payment_method 必须为 wallet 或 offline）
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}

	ctx := c.UserContext()
	userType := middleware.GetUserTypeFromContext(ctx)
	shopID := middleware.GetShopIDFromContext(ctx)

	// 线下支付仅限平台用户
	if req.PaymentMethod == model.PaymentMethodOffline {
		if userType != constants.UserTypeSuperAdmin && userType != constants.UserTypePlatform {
			return errors.New(errors.CodeForbidden, "只有平台可以使用线下支付")
		}
	} else if req.PaymentMethod == model.PaymentMethodWallet {
		if userType != constants.UserTypeAgent && userType != constants.UserTypePlatform && userType != constants.UserTypeSuperAdmin {
			return errors.New(errors.CodeForbidden, "无权创建订单")
		}
	} else {
		// 防御性分支：DTO 验证已限制，此处兜底
		return errors.New(errors.CodeInvalidParam, "后台仅支持钱包支付和线下支付")
	}

	buyerType := ""
	buyerID := uint(0)
	if userType == constants.UserTypeAgent {
		buyerType = model.BuyerTypeAgent
		buyerID = shopID
	}

	order, err := h.service.CreateAdminOrder(ctx, &req, buyerType, buyerID)
	if err != nil {
		return err
	}

	return response.Success(c, order)
}

func (h *OrderHandler) Get(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return errors.New(errors.CodeInvalidParam, "无效的订单ID")
	}

	order, err := h.service.Get(c.UserContext(), uint(id))
	if err != nil {
		return err
	}

	return response.Success(c, order)
}

func (h *OrderHandler) List(c *fiber.Ctx) error {
	var req dto.OrderListRequest
	if err := c.QueryParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

	ctx := c.UserContext()
	userType := middleware.GetUserTypeFromContext(ctx)
	shopID := middleware.GetShopIDFromContext(ctx)

	var buyerType string
	var buyerID uint

	if userType == constants.UserTypeAgent {
		buyerType = model.BuyerTypeAgent
		buyerID = shopID
	} else {
		buyerType = ""
		buyerID = 0
	}

	orders, err := h.service.List(ctx, &req, buyerType, buyerID)
	if err != nil {
		return err
	}

	return response.Success(c, orders)
}

func (h *OrderHandler) Cancel(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return errors.New(errors.CodeInvalidParam, "无效的订单ID")
	}

	ctx := c.UserContext()
	userType := middleware.GetUserTypeFromContext(ctx)
	shopID := middleware.GetShopIDFromContext(ctx)

	if userType != constants.UserTypeAgent {
		return errors.New(errors.CodeForbidden, "只有代理账号可以取消订单")
	}

	if err := h.service.Cancel(ctx, uint(id), model.BuyerTypeAgent, shopID); err != nil {
		return err
	}

	return response.Success(c, nil)
}

// PurchaseCheck 代购订单预检接口
// 路由: POST /api/admin/orders/purchase-check
// 参数: order_type(订单类型), resource_id(资源ID), package_ids(套餐ID列表)
// 响应: 套餐总价、强充要求、实际支付金额等预检结果
func (h *OrderHandler) PurchaseCheck(c *fiber.Ctx) error {
	var req dto.PurchaseCheckRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

	result, err := h.service.GetPurchaseCheck(c.UserContext(), &req)
	if err != nil {
		return err
	}

	return response.Success(c, result)
}