package main

import (
	"context"
	"errors"
	"log"
	"log/slog"
	"os"
	"os/exec"
	"path"
	"searchix/internal/config"
	"searchix/internal/importer"
	"searchix/internal/search"
	"slices"
	"strings"
	"time"
)

const timeout = 30 * time.Minute

func main() {
	if _, found := os.LookupEnv("DEBUG"); found {
		slog.SetLogLoggerLevel(slog.LevelDebug)
	}
	cfg, err := config.GetConfig()
	if err != nil {
		log.Fatal(err)
	}

	enabledSources := slices.DeleteFunc(cfg.Sources, func(s importer.Source) bool {
		return !s.Enable
	})

	if len(enabledSources) == 0 {
		slog.Info("No sources enabled")

		return
	}

	indexer, err := search.NewIndexer(cfg.DataPath)
	if err != nil {
		log.Fatalf("Failed to create indexer: %v", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()

	var imp importer.Importer
	var hadErrors bool
	for _, source := range enabledSources {
		logger := slog.With("name", source.Name, "importer", source.Type.String())
		logger.Debug("starting importer")

		switch source.Type {
		case importer.ChannelNixpkgs:
			imp = importer.NewNixpkgsChannelImporter(source, cfg.DataPath, logger)
		case importer.Channel:
			imp = importer.NewChannelImporter(source, cfg.DataPath, logger)
		default:
			log.Printf("unsupported importer type %s", source.Type.String())

			continue
		}

		updated, err := imp.FetchIfNeeded(ctx)

		if err != nil {
			var exerr *exec.ExitError
			if errors.As(err, &exerr) {
				lines := strings.Split(strings.TrimSpace(string(exerr.Stderr)), "\n")
				for _, line := range lines {
					logger.Warn("importer fetch failed", "stderr", line, "status", exerr.ExitCode())
				}
			} else {
				logger.Warn("importer fetch failed", "error", err)
			}
			hadErrors = true

			continue
		}
		logger.Info("importer fetch succeeded", "updated", updated)

		if updated {
			hadWarnings, err := imp.Import(ctx, indexer)

			if err != nil {
				msg := err.Error()
				for _, line := range strings.Split(strings.TrimSpace(msg), "\n") {
					logger.Error("importer init failed", "error", line)
				}

				continue
			}
			if hadWarnings {
				logger.Warn("importer succeeded, but with warnings/errors")
			} else {
				logger.Info("importer succeeded")
			}
		}
	}

	err = indexer.Close()
	if err != nil {
		slog.Error("error closing indexer", "error", err)
	}

	if hadErrors {
		os.RemoveAll(path.Join(cfg.DataPath, "index.bleve"))
		defer os.Exit(1)
	}
}