package fqapi

import (
	"fanqie/internal/common"
	"fmt"
	"net/url"
)

var rankLogger = common.NewLogger("rank", "INFO", "")

// rankSDKHosts 免签名榜单接口的可用域名（依次容错）
var rankSDKHosts = []string{
	"https://novel.snssdk.com",
	"https://api.fanqiesdk.com",
	"https://api-lf.fanqiesdk.com",
}

const rankSDKUA = "com.ss.android.article.news/7.0.3 (Linux; U; Android 12; zh_CN; Pixel 6)"

// RankTypes 榜单类型
var RankTypes = map[int]string{
	10: "推荐榜",
	11: "完结榜",
	12: "热搜榜",
	13: "黑马榜",
	15: "爆更榜",
}

// HandleGetRank 处理获取榜单,榜单数据动态,短缓存 10 分钟
// sideType 见 RankTypes（无效值回退推荐榜）；page 从 1 起，每页 20 本
func HandleGetRank(sideType, page int) (string, error) {
	if _, ok := RankTypes[sideType]; !ok {
		sideType = 10
	}
	if page < 1 {
		page = 1
	}
	return withCache(fmt.Sprintf("rank_%d_%d", sideType, page), 600, func() (string, error) {
		return fetchRank(sideType, page)
	})
}

// fetchRank 免签名 SDK 接口获取榜单（无设备/签名依赖，多域名容错）
func fetchRank(sideType, page int) (string, error) {
	vals := url.Values{
		"aid":       {"13"},
		"type":      {"1"},
		"side_type": {fmt.Sprintf("%d", sideType)},
		"offset":    {fmt.Sprintf("%d", page-1)},
		"limit":     {"20"},
	}
	path := "/api/novel/channel/homepage/rank/rank_list/v2/?" + vals.Encode()

	var lastErr error
	client := common.NewHTTPClient()
	for _, host := range rankSDKHosts {
		resp, err := client.Get(host+path, map[string]string{
			"User-Agent": rankSDKUA,
			"Accept":     "application/json, text/plain, */*",
		})
		if err != nil {
			lastErr = err
			continue
		}
		respJSON, err := resp.JSON()
		if err != nil {
			lastErr = fmt.Errorf("响应解析失败: %w", err)
			continue
		}
		if code, ok := respJSON["code"].(float64); ok && code == 0 {
			return reencodeUnwrapped(resp.Text), nil
		}
		lastErr = fmt.Errorf("code=%.0f msg=%v", respJSON["code"], respJSON["message"])
	}
	rankLogger.Error(fmt.Sprintf("获取榜单失败: %v", lastErr))
	return BuildErrorResponse("获取榜单失败"), lastErr
}