package apply

import (
	"fmt"
	"os"
	"path/filepath"

	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	"novit.nc/direktil/pkg/config"
)

// Files writes the files from the given config
func Files(cfg *config.Config, prefix string, filters ...string) error {
	accept := func(n string) bool { return true }

	if len(filters) > 0 {
		accept = func(n string) bool {
			for _, filter := range filters {
				if matched, err := filepath.Match(filter, n); err != nil {
					log.Error().Err(err).Str("filter", filter).Msg("bad filter, ignored")
				} else if matched {
					return true
				}
			}
			return false
		}
	}

	failed := 0

	for _, file := range cfg.Files {
		if !accept(file.Path) {
			continue
		}

		filePath := filepath.Join(prefix, file.Path)

		mode := file.Mode
		if mode == 0 {
			mode = 0644
		}

		log := log.With().Str("file", filePath).Str("mode", fmt.Sprintf("%04o", mode)).Logger()

		content := []byte(file.Content)

		err := writeFile(
			log,
			filePath,
			content,
			mode,
			0755,
			cfg,
		)

		if err != nil {
			failed++
			continue
		}
	}

	if failed != 0 {
		err := fmt.Errorf("%d writes failed", failed)
		log.Error().Err(err).Send()
		return err
	}
	return nil
}

func writeFile(log zerolog.Logger, path string, content []byte, fileMode, dirMode os.FileMode, cfg *config.Config) (err error) {
	if err = os.MkdirAll(filepath.Dir(path), dirMode); err != nil {
		log.Error().Err(err).Msg("failed to create parent dir")
		return
	}

	log.Info().Msgf("writing %d bytes", len(content))
	if err = os.WriteFile(path, content, fileMode); err != nil {
		log.Error().Err(err).Msg("write failed")
		return
	}

	return
}