package storage

import (
	"context"
	"fmt"
	"io"
	"log/slog"
	"net/http"
	"time"
)

// DownloadAndStoreCover fetches the image at imageURL and stores it in the
// store under key. Errors are logged but not returned — this is best-effort.
// If the asset is already present the download is skipped.
func DownloadAndStoreCover(store Store, log *slog.Logger, key, imageURL string) {
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	// Skip if already stored.
	if _, _, ok, _ := store.GetBrowseAsset(ctx, key); ok {
		return
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, imageURL, nil)
	if err != nil {
		log.Warn("cover: build request failed", "key", key, "url", imageURL, "err", err)
		return
	}
	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; libnovel-scraper/1.0)")

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Warn("cover: fetch failed", "key", key, "url", imageURL, "err", fmt.Errorf("%w", err))
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		log.Warn("cover: non-200 response", "key", key, "url", imageURL, "status", resp.StatusCode)
		return
	}

	data, err := io.ReadAll(resp.Body)
	if err != nil {
		log.Warn("cover: read body failed", "key", key, "url", imageURL, "err", err)
		return
	}

	contentType := resp.Header.Get("Content-Type")
	if contentType == "" {
		contentType = "image/jpeg"
	}

	if err := store.SaveBrowseAsset(ctx, key, data, contentType); err != nil {
		log.Warn("cover: SaveBrowseAsset failed", "key", key, "err", err)
		return
	}
	log.Debug("cover: stored", "key", key, "bytes", len(data))
}