package web

import (
	"errors"
	"net/http"

	"gitea.kazu634.com/kazu634/tver/internal/store"
)

type episodeActionView struct {
	ID, Genre, Status, StatusText string
}

func statusText(status string) string {
	switch status {
	case "queued":
		return "待機中"
	case "running":
		return "ダウンロード中"
	case "succeeded":
		return "完了"
	case "failed":
		return "失敗"
	case "canceled":
		return "取り消し"
	default:
		return ""
	}
}

func (s *server) enqueue(w http.ResponseWriter, r *http.Request) {
	genre, id, ok := episodeForm(w, r)
	if !ok {
		return
	}
	ep, found := s.cachedEpisode(genre, id)
	if !found {
		http.Error(w, "新着キャッシュにエピソードがありません。新着を再表示してください", http.StatusNotFound)
		return
	}
	job, _, err := s.jobs.Enqueue(r.Context(), storeEpisode(ep), "manual")
	if err != nil {
		s.logger.Printf("待ち行列への登録に失敗: %v", err)
		http.Error(w, "待ち行列に登録できませんでした", http.StatusInternalServerError)
		return
	}
	s.episodeActionResponse(w, r, episodeActionView{ID: id, Genre: genre, Status: job.Status, StatusText: statusText(job.Status)})
}

func (s *server) retryEpisode(w http.ResponseWriter, r *http.Request) {
	genre, id, ok := episodeForm(w, r)
	if !ok {
		return
	}
	if _, found := s.cachedEpisode(genre, id); !found {
		http.Error(w, "新着キャッシュにエピソードがありません。新着を再表示してください", http.StatusNotFound)
		return
	}
	if err := s.jobs.RetryEpisode(r.Context(), id); err != nil {
		if errors.Is(err, store.ErrInvalidTransition) {
			http.Error(w, "再試行できる状態ではありません", http.StatusConflict)
		} else {
			s.logger.Printf("ジョブの再試行に失敗: %v", err)
			http.Error(w, "再試行できませんでした", http.StatusInternalServerError)
		}
		return
	}
	s.episodeActionResponse(w, r, episodeActionView{ID: id, Genre: genre, Status: "queued", StatusText: statusText("queued")})
}

func episodeForm(w http.ResponseWriter, r *http.Request) (string, string, bool) {
	if err := r.ParseForm(); err != nil {
		http.Error(w, "フォームを読み取れませんでした", http.StatusBadRequest)
		return "", "", false
	}
	genre, id := r.Form.Get("genre"), r.Form.Get("episode_id")
	if (genre != "drama" && genre != "variety") || id == "" {
		http.Error(w, "ジャンルまたはエピソード ID が不正です", http.StatusBadRequest)
		return "", "", false
	}
	return genre, id, true
}

func (s *server) episodeActionResponse(w http.ResponseWriter, r *http.Request, view episodeActionView) {
	if r.Header.Get("HX-Request") != "true" {
		http.Redirect(w, r, "/?genre="+view.Genre, http.StatusSeeOther)
		return
	}
	s.render(w, "episode_action", view)
}