package coinledger

import (
	"database/sql"
	"errors"
	"fmt"
	"strconv"
	"strings"

	"hyapp-admin-server/internal/appctx"
	"hyapp-admin-server/internal/integration/walletclient"
	"hyapp-admin-server/internal/middleware"
	"hyapp-admin-server/internal/modules/shared"
	"hyapp-admin-server/internal/response"

	"github.com/gin-gonic/gin"
)

type Handler struct {
	service *Service
	audit   shared.OperationLogger
}

func New(userDB *sql.DB, walletDB *sql.DB, adminDB *sql.DB, walletClient walletclient.Client, audit shared.OperationLogger) *Handler {
	return &Handler{service: NewService(userDB, walletDB, adminDB, walletClient), audit: audit}
}

func (h *Handler) ListCoinLedger(c *gin.Context) {
	query, ok := parseListQuery(c)
	if !ok {
		return
	}
	items, total, err := h.service.ListCoinLedger(c.Request.Context(), appctx.FromContext(c.Request.Context()), query)
	if err != nil {
		response.ServerError(c, "获取金币流水失败")
		return
	}
	response.OK(c, response.Page{Items: items, Page: query.Page, PageSize: query.PageSize, Total: total})
}

func (h *Handler) ListCoinAdjustments(c *gin.Context) {
	query, ok := parseListQuery(c)
	if !ok {
		return
	}
	items, total, err := h.service.ListCoinAdjustments(c.Request.Context(), appctx.FromContext(c.Request.Context()), query)
	if err != nil {
		response.ServerError(c, "获取金币增减列表失败")
		return
	}
	response.OK(c, response.Page{Items: items, Page: query.Page, PageSize: query.PageSize, Total: total})
}

func (h *Handler) LookupCoinAdjustmentTarget(c *gin.Context) {
	user, err := h.service.LookupCoinAdjustmentTarget(c.Request.Context(), appctx.FromContext(c.Request.Context()), firstQuery(c, "user_id", "userId", "keyword"))
	if err != nil {
		if errors.Is(err, errCoinAdjustmentTargetNotFound) {
			response.BadRequest(c, "用户不存在")
			return
		}
		response.ServerError(c, "查询用户失败")
		return
	}
	response.OK(c, user)
}

func (h *Handler) CreateCoinAdjustment(c *gin.Context) {
	var req coinAdjustmentRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "金币增减参数不正确")
		return
	}
	result, err := h.service.CreateCoinAdjustment(
		c.Request.Context(),
		appctx.FromContext(c.Request.Context()),
		int64(shared.ActorFromContext(c).UserID),
		middleware.CurrentRequestID(c),
		req,
	)
	if err != nil {
		if errors.Is(err, errCoinAdjustmentTargetNotFound) {
			response.BadRequest(c, "用户不存在")
			return
		}
		response.BadRequest(c, err.Error())
		return
	}
	shared.OperationLogWithResourceID(c, h.audit, "coin-adjustment-create", "wallet_entries", result.TransactionID, "success",
		fmt.Sprintf("target_user_id=%v amount=%d transaction_id=%s reason=%q", req.TargetUserID, req.Amount, result.TransactionID, strings.TrimSpace(req.Reason)))
	response.Created(c, result)
}

func parseListQuery(c *gin.Context) (listQuery, bool) {
	options := shared.ListOptions(c)
	startAtMS, ok := optionalInt64(c, "start_at_ms", "startAtMs")
	if !ok {
		response.BadRequest(c, "开始时间不正确")
		return listQuery{}, false
	}
	endAtMS, ok := optionalInt64(c, "end_at_ms", "endAtMs")
	if !ok {
		response.BadRequest(c, "结束时间不正确")
		return listQuery{}, false
	}
	if startAtMS > 0 && endAtMS > 0 && startAtMS >= endAtMS {
		response.BadRequest(c, "时间区间不正确")
		return listQuery{}, false
	}
	return normalizeListQuery(listQuery{
		Page:        options.Page,
		PageSize:    options.PageSize,
		UserKeyword: strings.TrimSpace(firstQuery(c, "user_keyword", "userKeyword", "user_id", "userId", "keyword")),
		StartAtMS:   startAtMS,
		EndAtMS:     endAtMS,
	}), true
}

func optionalInt64(c *gin.Context, keys ...string) (int64, bool) {
	value := strings.TrimSpace(firstQuery(c, keys...))
	if value == "" {
		return 0, true
	}
	parsed, err := strconv.ParseInt(value, 10, 64)
	if err != nil || parsed < 0 {
		return 0, false
	}
	return parsed, true
}

func firstQuery(c *gin.Context, keys ...string) string {
	for _, key := range keys {
		if value := c.Query(key); value != "" {
			return value
		}
	}
	return ""
}