// Package hook runs post-sync hook scripts.
package hook

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"strconv"

	"s3watch/internal/syncer"
)

// Runner executes a configured hook script after changes.
type Runner struct {
	path string
	dir  string
}

// NewRunner creates a hook runner for an executable script path.
func NewRunner(path string, dir string) Runner {
	return Runner{path: path, dir: dir}
}

// Run executes the hook and passes change counts through environment variables.
func (r Runner) Run(ctx context.Context, result syncer.Result) error {
	if r.path == "" {
		return nil
	}

	cmd := exec.CommandContext(ctx, r.path)
	cmd.Dir = r.dir
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	cmd.Env = append(os.Environ(),
		"S3WATCH_CHANGED="+strconv.FormatBool(result.Changed()),
		"S3WATCH_DOWNLOADED="+strconv.Itoa(result.Downloaded),
		"S3WATCH_UPLOADED="+strconv.Itoa(result.Uploaded),
		"S3WATCH_UPDATED="+strconv.Itoa(result.Updated),
		"S3WATCH_DELETED="+strconv.Itoa(result.Deleted),
		"S3WATCH_UNCHANGED="+strconv.Itoa(result.Unchanged),
	)

	if err := cmd.Run(); err != nil {
		return fmt.Errorf("executing %q: %w", r.path, err)
	}
	return nil
}