package usecase

import (
	"context"
	"fmt"
	"strings"

	app "haixun-backend/internal/library/errors"
	"haixun-backend/internal/library/errors/code"
	libthreads "haixun-backend/internal/library/threadsapi"
	domusecase "haixun-backend/internal/model/threads_account/domain/usecase"
)

func (u *threadsAccountUseCase) RunAPISmokeTest(
	ctx context.Context,
	tenantID, ownerUID, accountID string,
) ([]domusecase.APISmokeTestItem, error) {
	account, err := u.assertOwned(ctx, tenantID, ownerUID, accountID)
	if err != nil {
		return nil, err
	}
	token, err := u.ResolveAccountAPIAccessToken(ctx, tenantID, ownerUID, accountID)
	if err != nil {
		return nil, err
	}
	client := libthreads.NewClient(token)
	if !client.Enabled() {
		return nil, app.For(code.ThreadsAccount).InputMissingRequired("Threads API token 無效")
	}

	var out []domusecase.APISmokeTestItem
	add := func(scope, name, status, message string, count int) {
		out = append(out, domusecase.APISmokeTestItem{
			Scope: scope, Name: name, Status: status, Message: message, Count: count,
		})
	}
	run := func(scope, name string, fn func() (int, string, error)) {
		count, detail, err := fn()
		if err != nil {
			msg := err.Error()
			if libthreads.IsPermissionError(err) {
				msg += "（請確認 Meta App 已授權此 scope，且帳號在測試人員名單）"
			}
			add(scope, name, "error", msg, 0)
			return
		}
		if detail != "" {
			add(scope, name, "ok", detail, count)
			return
		}
		add(scope, name, "ok", fmt.Sprintf("成功（%d 筆）", count), count)
	}

	profile, profileErr := libthreads.GetMeProfile(ctx, token)
	userID := strings.TrimSpace(account.ThreadsUserID)
	username := strings.TrimSpace(account.Username)
	if profileErr == nil && profile != nil {
		if userID == "" {
			userID = profile.ID.String()
		}
		if username == "" {
			username = profile.Username
		}
	}

	run("threads_basic", "GET /me 個人資料", func() (int, string, error) {
		if profileErr != nil {
			return 0, "", profileErr
		}
		return 1, "user_id=" + profile.ID.String() + " @" + profile.Username, nil
	})

	if userID == "" {
		add("threads_basic", "GET /{user-id}/threads 貼文列表", "error", "缺少 threads_user_id，請重新 OAuth", 0)
	} else {
		var sampleMediaID string
		run("threads_basic", "GET /{user-id}/threads 貼文列表", func() (int, string, error) {
			items, err := client.UserThreads(ctx, userID, 5)
			if err != nil {
				return 0, "", err
			}
			if len(items) > 0 {
				sampleMediaID = items[0].ID
			}
			return len(items), "", nil
		})
		if sampleMediaID != "" {
			run("threads_manage_insights", "GET /{media-id}/insights 貼文互動", func() (int, string, error) {
				stats, err := client.GetMediaStats(ctx, sampleMediaID)
				if err != nil {
					return 0, "", err
				}
				return 1, fmt.Sprintf("likes=%d replies=%d views=%d", stats.LikeCount, stats.ReplyCount, stats.Views), nil
			})
			run("threads_read_replies", "GET /{media-id}/replies 留言列表", func() (int, string, error) {
				items, err := client.MediaReplies(ctx, sampleMediaID, 5)
				if err != nil {
					return 0, "", err
				}
				return len(items), "", nil
			})
		} else {
			add("threads_manage_insights", "GET /{media-id}/insights 貼文互動", "skip", "帳號尚無貼文，略過", 0)
			add("threads_read_replies", "GET /{media-id}/replies 留言列表", "skip", "帳號尚無貼文，略過", 0)
		}
	}

	run("threads_keyword_search", "GET /keyword_search 關鍵字搜尋", func() (int, string, error) {
		items, err := client.KeywordSearch(ctx, libthreads.KeywordSearchOptions{
			Query: "threads", Limit: 5, SearchType: "TOP",
		})
		if err != nil {
			return 0, "", err
		}
		return len(items), "", nil
	})

	if username != "" {
		run("threads_profile_discovery", "GET /profile_lookup 帳號查詢", func() (int, string, error) {
			res, err := client.ProfileLookup(ctx, username)
			if err != nil {
				return 0, "", err
			}
			return 1, "@" + res.Username + " name=" + res.Name, nil
		})
	} else {
		add("threads_profile_discovery", "GET /profile_lookup 帳號查詢", "skip", "缺少 username，略過", 0)
	}

	if userID != "" {
		run("threads_manage_mentions", "GET /{user-id}/mentions 提及", func() (int, string, error) {
			items, err := client.UserMentions(ctx, userID, 5)
			if err != nil {
				return 0, "", err
			}
			return len(items), "", nil
		})
		run("threads_manage_insights", "GET /{user-id}/threads_insights 洞察", func() (int, string, error) {
			items, err := client.UserInsights(ctx, userID, nil)
			if err != nil {
				return 0, "", err
			}
			return len(items), fmt.Sprintf("%d 項指標", len(items)), nil
		})
	} else {
		add("threads_manage_mentions", "GET /{user-id}/mentions 提及", "skip", "缺少 threads_user_id", 0)
		add("threads_manage_insights", "GET /{user-id}/threads_insights 洞察", "skip", "缺少 threads_user_id", 0)
	}

	run("threads_location_tagging", "GET /location_search 地點搜尋", func() (int, string, error) {
		items, err := client.LocationSearch(ctx, "Taipei", 5)
		if err != nil {
			return 0, "", err
		}
		return len(items), "", nil
	})

	add("threads_content_publish", "POST 發文 / 回覆", "manual",
		"請用產品 API：POST /personas/:id/copy-drafts/:draftId/publish 或 outreach-drafts/publish", 0)
	add("threads_delete", "DELETE /{media-id} 刪文", "manual",
		"會真的刪除貼文，請在 Threads 後台或自行呼叫 DeleteMedia 測試", 0)
	add("threads_manage_replies", "POST 隱藏留言", "manual",
		"會改變留言狀態，請用 HideReply(reply_id) 手動測試", 0)
	add("threads_share_to_instagram", "POST 同步到 IG", "manual",
		"需已連結 IG 且會真的 crosspost，請用 ShareToInstagram(media_id) 手動測試", 0)

	return out, nil
}