package service

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"
	"time"

	"model-asynch/model/entity"

	"github.com/gogf/gf/v2/frame/g"
)

// triggerSuccessCallback 任务成功后的回调钩子：
// - 使用 GET 请求
// - 回调地址为 callbackUrl + "/" + bizName
// - query 参数：task_id/state/oss_file/file_type
// 注意：回调失败不影响任务主流程，只记录日志。
func triggerSuccessCallback(ctx context.Context, t *entity.AsynchTask) {
	if t == nil {
		return
	}
	callbackURL := strings.TrimSpace(t.CallbackURL)
	bizName := strings.TrimSpace(t.BizName)
	if callbackURL == "" || bizName == "" {
		return
	}

	u, err := url.Parse(callbackURL)
	if err != nil {
		g.Log().Warningf(ctx, "[callback] invalid callbackUrl=%s err=%v", callbackURL, err)
		return
	}
	// 必须是可发起 HTTP 请求的绝对地址
	if u.Scheme == "" || u.Host == "" {
		g.Log().Warningf(ctx, "[callback] callbackUrl must be absolute http(s) url, got=%s", callbackURL)
		return
	}

	// path 末尾拼接 bizName
	bizSeg := url.PathEscape(bizName)
	if strings.HasSuffix(u.Path, "/") || u.Path == "" {
		u.Path = strings.TrimRight(u.Path, "/") + "/" + bizSeg
	} else {
		u.Path = u.Path + "/" + bizSeg
	}

	q := u.Query()
	q.Set("task_id", t.TaskID)
	q.Set("state", fmt.Sprintf("%d", t.State))
	q.Set("oss_file", t.OssFile)
	q.Set("file_type", t.FileType)
	u.RawQuery = q.Encode()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
	if err != nil {
		g.Log().Warningf(ctx, "[callback] build request failed url=%s err=%v", u.String(), err)
		return
	}
	// 透传必要头部（如 Authorization / X-User-Info）
	for k, v := range forwardHeaders(ctx) {
		if v != "" {
			req.Header.Set(k, v)
		}
	}

	client := &http.Client{Timeout: 5 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		g.Log().Warningf(ctx, "[callback] request failed url=%s err=%v", u.String(), err)
		return
	}
	defer resp.Body.Close()
	b, _ := io.ReadAll(resp.Body)
	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		msg := string(b)
		if len(msg) > 2000 {
			msg = msg[:2000]
		}
		g.Log().Warningf(ctx, "[callback] non-2xx url=%s code=%d body=%s", u.String(), resp.StatusCode, msg)
		return
	}
	g.Log().Infof(ctx, "[callback] success url=%s code=%d", u.String(), resp.StatusCode)
}