package rss

import (
	"context"
	"log/slog"
	"net/url"
	"time"

	"github.com/mmcdole/gofeed"
	"go.dev.pztrn.name/rsser/fixers"
)

// Parse parses RSS feeds and produce output in outputs.
func (r *RSS) Parse() {
	for _, feed := range r.cfg.RSS.Feeds {
		ctx, cancelFunc := context.WithTimeout(
			context.Background(),
			time.Second*time.Duration(r.cfg.RSS.HTTPClient.RequestTimeoutSeconds),
		)
		//revive:disable:defer
		defer cancelFunc()

		parser := gofeed.NewParser()

		parsedFeedData, err := parser.ParseURLWithContext(feed.URL, ctx)
		if err != nil {
			slog.Error("Failed to parse feed!", "name", feed.Name, "error", err.Error())

			return
		}

		feedURL, _ := url.Parse(feed.URL)

		for _, item := range parsedFeedData.Items {
			slog.Info(
				"Processing feed item...",
				"domain", feedURL.Host,
				"guid", item.GUID,
			)

			itemWasProcessed, err := r.checkItemWasProcessed(feedURL.Host, item.GUID)
			if err != nil {
				slog.Error(
					"Failed to check item processing status!",
					"domain", feedURL.Host,
					"guid", item.GUID,
					"error", err.Error(),
				)

				return
			}

			if itemWasProcessed {
				slog.Info(
					"Feed item already processed, skipping.",
					"domain", feedURL.Host,
					"guid", item.GUID,
				)

				continue
			}

			title, fixedDescription := fixers.Fix(feedURL.Host, item)

			for _, output := range r.outputs {
				if feed.Output == output.Name() {
					if err := output.Do(feed.Destination, feed.Name, item.Link, title, fixedDescription); err != nil {
						slog.Error(
							"Failed to process feed item with outputter!",
							"feed", feed.Name,
							"guid", item.GUID,
							"error", err.Error(),
						)

						return
					}

					break
				}
			}

			if err := r.addProcessedItem(feedURL.Host, item.GUID); err != nil {
				slog.Error(
					"Failed to save item processing status!",
					"domain", feedURL.Host,
					"guid", item.GUID,
					"error", err.Error(),
				)

				return
			}
		}
	}
}