package api

import (
	"database/sql"
	"fmt"
	"net/http"
	"strconv"
	"strings"
)

type CreatorsAPI struct {
	db *sql.DB
}

func CreatorsHandler(db *sql.DB) http.Handler {
	api := &CreatorsAPI{db: db}
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		p := strings.TrimPrefix(r.URL.Path, "/api/creators")
		if r.Method == http.MethodGet && p == "" {
			api.list(w, r)
			return
		}
		w.WriteHeader(http.StatusNotFound)
	})
}

func (a *CreatorsAPI) list(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query().Get("q")
	limitStr := r.URL.Query().Get("limit")
	limit := 2000
	if limitStr != "" {
		if n, err := strconv.Atoi(limitStr); err == nil && n > 0 && n <= 10000 {
			limit = n
		}
	}
	// 查询 admin_user 表的 id 和 real_name
	sqlStr := "SELECT id, COALESCE(real_name, '') AS name FROM `admin_user` WHERE delete_time = 0"
	args := []interface{}{}
	if q != "" {
		sqlStr += " AND (CAST(id AS CHAR) LIKE ? OR real_name LIKE ?)"
		like := "%" + q + "%"
		args = append(args, like, like)
	}
	sqlStr += " ORDER BY id ASC LIMIT ?"
	args = append(args, limit)
	rows, err := a.db.Query(sqlStr, args...)
	if err != nil {
		fail(w, r, http.StatusInternalServerError, err.Error())
		return
	}
	defer rows.Close()
	out := []map[string]interface{}{}
	for rows.Next() {
		var id sql.NullInt64
		var name sql.NullString
		if err := rows.Scan(&id, &name); err != nil {
			continue
		}
		if !id.Valid {
			continue
		}
		n := strings.TrimSpace(name.String)
		if n == "" {
			n = strconv.FormatInt(id.Int64, 10)
		}
		display := fmt.Sprintf("%s（%d）", n, id.Int64)
		out = append(out, map[string]interface{}{"id": id.Int64, "name": display})
	}
	ok(w, r, out)
}