package admin

import (
	"bytes"
	"strconv"
	"strings"
	"time"

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

	agentrechargeapp "github.com/break/junhong_cmp_fiber/internal/application/agentrecharge"
	systemconfigapp "github.com/break/junhong_cmp_fiber/internal/application/systemconfig"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	agentrechargequery "github.com/break/junhong_cmp_fiber/internal/query/agentrecharge"
	agentRechargeSvc "github.com/break/junhong_cmp_fiber/internal/service/agent_recharge"
	"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"
)

// AgentRechargeHandler 代理预充值 Handler
type AgentRechargeHandler struct {
	service   *agentRechargeSvc.Service
	online    *agentrechargeapp.OnlineCreationService
	status    *agentrechargequery.PaymentStatusQuery
	ocr       *agentrechargeapp.PaymentVoucherOCRService
	config    *systemconfigapp.UpdateService
	validator *validator.Validate
}

// SetOnlineCreationService 注入代理在线扫码充值用例。
func (h *AgentRechargeHandler) SetOnlineCreationService(service *agentrechargeapp.OnlineCreationService) {
	h.online = service
}

// SetPaymentStatusQuery 注入代理充值本地支付状态 Query。
func (h *AgentRechargeHandler) SetPaymentStatusQuery(query *agentrechargequery.PaymentStatusQuery) {
	h.status = query
}

// SetPaymentVoucherOCRService 注入付款凭证识别用例。
func (h *AgentRechargeHandler) SetPaymentVoucherOCRService(service *agentrechargeapp.PaymentVoucherOCRService) {
	h.ocr = service
}

// SetSystemConfigUpdateService 注入受控系统配置写服务，用于代理自充允许范围修改。
func (h *AgentRechargeHandler) SetSystemConfigUpdateService(service *systemconfigapp.UpdateService) {
	h.config = service
}

// NewAgentRechargeHandler 创建代理预充值 Handler
func NewAgentRechargeHandler(service *agentRechargeSvc.Service, validator *validator.Validate) *AgentRechargeHandler {
	return &AgentRechargeHandler{service: service, validator: validator}
}

// Create 创建代理充值订单
// POST /api/admin/agent-recharges
func (h *AgentRechargeHandler) Create(c *fiber.Ctx) error {
	var req dto.CreateAgentRechargeRequest
	decoder := sonic.ConfigStd.NewDecoder(bytes.NewReader(c.Body()))
	decoder.DisallowUnknownFields()
	if err := decoder.Decode(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}

	if req.PaymentMethod == constants.RechargeMethodWechat || req.PaymentMethod == constants.RechargeMethodAlipay {
		return h.createOnline(c, req)
	}
	if strings.TrimSpace(req.RequestID) != "" {
		return errors.New(errors.CodeInvalidParam, "线下充值不能传入在线请求标识")
	}
	result, err := h.service.Create(c.UserContext(), &req)
	if err != nil {
		return err
	}

	return response.Success(c, result)
}

func (h *AgentRechargeHandler) createOnline(c *fiber.Ctx, req dto.CreateAgentRechargeRequest) error {
	if h.online == nil {
		return errors.New(errors.CodeServiceUnavailable, "代理在线充值能力未配置")
	}
	if req.ShopID != nil || len(req.PaymentVoucherKey) > 0 || len(req.OtherVoucherKey) > 0 ||
		req.OfflinePaymentMethodID != 0 || strings.TrimSpace(req.ExternalTransactionNo) != "" || strings.TrimSpace(req.Remark) != "" {
		return errors.New(errors.CodeInvalidParam, "在线充值不能指定店铺、收款方式、交易流水号、支付凭证或运营备注")
	}
	result, err := h.online.Execute(c.UserContext(), agentrechargeapp.CreateOnlineCommand{
		AccountID: middleware.GetUserIDFromContext(c.UserContext()), UserType: middleware.GetUserTypeFromContext(c.UserContext()),
		CurrentShopID: middleware.GetShopIDFromContext(c.UserContext()), Amount: req.Amount,
		PaymentMethod: req.PaymentMethod, RequestID: req.RequestID, PayerClientIP: c.IP(),
	})
	if err != nil {
		return err
	}
	rechargeSource, rechargeSourceName := constants.GetAgentRechargeSource(result.Payment.PaymentMethod)
	return response.Success(c, &dto.AgentRechargeOnlineResponse{
		RechargeID: result.Recharge.ID, RechargeNo: result.Recharge.RechargeNo, PaymentNo: result.Payment.PaymentNo,
		PaymentMethod: result.Payment.PaymentMethod, Amount: result.Payment.Amount, QRContent: result.Payment.QRContent,
		RechargeSource: rechargeSource, RechargeSourceName: rechargeSourceName,
		Status: result.Recharge.Status, StatusName: constants.GetRechargeStatusName(result.Recharge.Status),
	})
}

// PaymentMethods 查询代理在线充值可用支付方式。
// GET /api/admin/agent-recharges/payment-methods
func (h *AgentRechargeHandler) PaymentMethods(c *fiber.Ctx) error {
	if h.online == nil {
		return errors.New(errors.CodeServiceUnavailable, "代理在线充值能力未配置")
	}
	result, err := h.online.AvailablePaymentMethods(c.UserContext(), middleware.GetUserTypeFromContext(c.UserContext()))
	if err != nil {
		return err
	}
	return response.Success(c, &dto.AgentRechargePaymentMethodsResponse{
		Methods: result.Methods, MinAmount: result.MinAmount, MaxAmount: result.MaxAmount,
	})
}

// SelfRechargePaymentMethods 查询代理自充实际可用支付方式。
// GET /api/admin/agent-self-recharge-payment-methods
// 响应只含交集结果，不含允许范围、商户身份或凭证。
func (h *AgentRechargeHandler) SelfRechargePaymentMethods(c *fiber.Ctx) error {
	return h.PaymentMethods(c)
}

// UpdateSelfRechargePaymentMethods 修改代理在线自充允许范围。
// PUT /api/admin/agent-self-recharge-payment-methods
// 复用受控系统配置写服务，获得超级管理员限定、咨询锁串行与前后值审计。
func (h *AgentRechargeHandler) UpdateSelfRechargePaymentMethods(c *fiber.Ctx) error {
	var req dto.AgentSelfRechargePaymentMethodsUpdateRequest
	decoder := sonic.ConfigStd.NewDecoder(bytes.NewReader(c.Body()))
	decoder.DisallowUnknownFields()
	if err := decoder.Decode(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}
	if h.config == nil {
		return errors.New(errors.CodeServiceUnavailable, "代理自充允许范围维护能力未配置")
	}
	item, err := h.config.Execute(c.UserContext(), constants.SystemConfigAgentSelfRechargeAllowedMethods,
		dto.UpdateSystemConfigRequest{Value: req.AllowedMethods})
	if err != nil {
		return err
	}
	updatedAt := ""
	if item.UpdatedAt != nil {
		updatedAt = item.UpdatedAt.UTC().Format(time.RFC3339)
	}
	return response.Success(c, &dto.AgentSelfRechargePaymentMethodsUpdateResponse{
		AllowedMethods: item.Value, AllowedMethodsName: constants.GetAgentSelfRechargeAllowedMethodsName(item.Value),
		UpdatedAt: updatedAt,
	})
}

// PaymentVoucherOCR 识别付款凭证，只返回交易流水号预填值。
// POST /api/admin/agent-recharges/payment-voucher-ocr
// 识别失败返回明确失败，不影响提交人人工填写交易流水号后创建申请。
func (h *AgentRechargeHandler) PaymentVoucherOCR(c *fiber.Ctx) error {
	var req dto.AgentRechargePaymentVoucherOCRRequest
	decoder := sonic.ConfigStd.NewDecoder(bytes.NewReader(c.Body()))
	decoder.DisallowUnknownFields()
	if err := decoder.Decode(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}
	if h.ocr == nil {
		return errors.New(errors.CodeServiceUnavailable, "付款凭证识别能力未配置")
	}
	result, err := h.ocr.Recognize(c.UserContext(), req.PaymentVoucherKey)
	if err != nil {
		return err
	}
	return response.Success(c, &dto.AgentRechargePaymentVoucherOCRResponse{
		ExternalTransactionNo: result.ExternalTransactionNo,
	})
}

// List 查询代理充值订单列表
// GET /api/admin/agent-recharges
func (h *AgentRechargeHandler) List(c *fiber.Ctx) error {
	var req dto.AgentRechargeListRequest
	if err := c.QueryParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}

	list, total, err := h.service.List(c.UserContext(), &req)
	if err != nil {
		return err
	}

	return response.SuccessWithPagination(c, list, total, req.Page, req.PageSize)
}

// Get 查询代理充值订单详情
// GET /api/admin/agent-recharges/:id
func (h *AgentRechargeHandler) Get(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
	}

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

	return response.Success(c, result)
}

// TriggerApproval 主动补发历史线下代理充值审批。
// POST /api/admin/agent-recharges/:id/trigger-approval
func (h *AgentRechargeHandler) TriggerApproval(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil || id == 0 {
		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
	}
	result, err := h.service.TriggerApproval(c.UserContext(), uint(id))
	if err != nil {
		return err
	}
	return response.Success(c, result)
}

// PaymentStatus 查询代理充值本地支付与到账状态。
// GET /api/admin/agent-recharges/:id/payment-status
func (h *AgentRechargeHandler) PaymentStatus(c *fiber.Ctx) error {
	if h.status == nil {
		return errors.New(errors.CodeServiceUnavailable, "代理充值支付状态查询未配置")
	}
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil || id == 0 {
		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
	}
	result, err := h.status.Get(c.UserContext(), uint(id))
	if err != nil {
		return err
	}
	return response.Success(c, result)
}

// Reject 驳回代理充值订单
// POST /api/admin/agent-recharges/:id/reject
func (h *AgentRechargeHandler) Reject(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
	}

	var req dto.AgentRechargeRejectRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}

	if err := h.service.Reject(c.UserContext(), uint(id), req.RejectionReason); err != nil {
		return err
	}

	return response.Success(c, nil)
}

// OfflinePay 确认线下充值
// POST /api/admin/agent-recharges/:id/offline-pay
func (h *AgentRechargeHandler) OfflinePay(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
	}

	var req dto.AgentOfflinePayRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

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

	return response.Success(c, result)
}