package handler

import (
	"net/http"
	"strconv"

	"bj_power_wms/ent/user"
	"bj_power_wms/internal/svc"
)

// eventLogListHandler GET /api/event/logs 操作日志分页查询
// 筛选：eventType(事件类型) operator(操作人) entityType(对象类型) from/to(unix 秒)
// 可见性：admin 可看全部并可按操作人筛选；普通用户强制只看自己的日志（忽略 operator 参数）。
// operatorName：操作人中文名（users.real_name，按 operator 批量映射，历史数据同样生效）。
func eventLogListHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return requirePerm(ctx, "eventlog:manage", func(w http.ResponseWriter, r *http.Request) {
		q := r.URL.Query()
		page, _ := strconv.Atoi(q.Get("page"))
		pageSize, _ := strconv.Atoi(q.Get("pageSize"))
		from, _ := strconv.ParseInt(q.Get("from"), 10, 64)
		to, _ := strconv.ParseInt(q.Get("to"), 10, 64)

		isAdmin := roleFromRequest(r) == "admin"
		operator := q.Get("operator")
		if !isAdmin {
			// 普通用户仅能查看自己的操作日志
			operator = r.Header.Get("X-Username")
		}

		list, total, err := ctx.EventLog.Query(ctx0(),
			q.Get("eventType"), operator, q.Get("entityType"),
			from, to, page, pageSize)
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}

		// 批量映射操作人中文名（real_name），缺档/系统写入显示原用户名
		ops := make([]string, 0, len(list))
		for _, e := range list {
			ops = append(ops, e.Operator)
		}
		nameMap := realNameMapOf(ctx, ops)
		rows := make([]map[string]any, 0, len(list))
		for _, e := range list {
			name := nameMap[e.Operator]
			if name == "" {
				name = e.Operator
			}
			rows = append(rows, map[string]any{
				"id":           e.ID,
				"eventType":    e.EventType,
				"description":  e.Description,
				"entityType":   e.EntityType,
				"entityId":     e.EntityID,
				"operator":     e.Operator,
				"operatorName": name,
				"payload":      e.Payload,
				"createdAt":    e.CreatedAt,
			})
		}
		ok(w, map[string]any{"list": rows, "total": total, "isAdmin": isAdmin})
	})
}

// realNameMapOf 批量取操作人中文名
func realNameMapOf(ctx *svc.ServiceContext, operators []string) map[string]string {
	set := make([]string, 0, len(operators))
	seen := map[string]bool{}
	for _, op := range operators {
		if op != "" && !seen[op] {
			seen[op] = true
			set = append(set, op)
		}
	}
	out := map[string]string{}
	if len(set) == 0 {
		return out
	}
	us, err := ctx.EntClient.User.Query().Where(user.UsernameIn(set...)).All(ctx0())
	if err != nil {
		return out
	}
	for _, u := range us {
		if u.RealName != "" {
			out[u.Username] = u.RealName
		}
	}
	return out
}