// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

package rewrite // import "miniflux.app/v2/internal/reader/rewrite"

import (
	"log/slog"
	"regexp"

	"miniflux.app/v2/internal/model"
)

var customReplaceRuleRegex = regexp.MustCompile(`rewrite\("([^"]+)"\|"([^"]+)"\)`)

func RewriteEntryURL(feed *model.Feed, entry *model.Entry) string {
	var rewrittenURL = entry.URL
	if feed.UrlRewriteRules != "" {
		parts := customReplaceRuleRegex.FindStringSubmatch(feed.UrlRewriteRules)

		if len(parts) >= 3 {
			re, err := regexp.Compile(parts[1])
			if err != nil {
				slog.Error("Failed on regexp compilation",
					slog.String("url_rewrite_rules", feed.UrlRewriteRules),
					slog.Any("error", err),
				)
				return rewrittenURL
			}
			rewrittenURL = re.ReplaceAllString(entry.URL, parts[2])
			slog.Debug("Rewriting entry URL",
				slog.String("original_entry_url", entry.URL),
				slog.String("rewritten_entry_url", rewrittenURL),
				slog.Int64("feed_id", feed.ID),
				slog.String("feed_url", feed.FeedURL),
			)
		} else {
			slog.Debug("Cannot find search and replace terms for replace rule",
				slog.String("original_entry_url", entry.URL),
				slog.String("rewritten_entry_url", rewrittenURL),
				slog.Int64("feed_id", feed.ID),
				slog.String("feed_url", feed.FeedURL),
				slog.String("url_rewrite_rules", feed.UrlRewriteRules),
			)
		}
	}

	return rewrittenURL
}