/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

package handler

import (
	"fmt"
	"os/exec"
	"strings"
	"text/template"

	"github.com/mattn/go-shellwords"
	"go.uber.org/zap"
)

func runTemplate(t *template.Template, env *TemplateEnv) (string, error) {
	var buf strings.Builder

	err := t.Execute(&buf, env)
	if err != nil {
		return "", fmt.Errorf("unable to parse exec template: %w", err)
	}

	return buf.String(), nil
}

func mkCmd(cmdline string) (*exec.Cmd, error) {
	args, err := shellwords.Parse(cmdline)
	if err != nil {
		return nil, fmt.Errorf("unable to parse exec line: %w", err)
	}

	if len(args) < 1 {
		return nil, fmt.Errorf("exec line evaluated as empty")
	}

	return exec.Command(args[0], args[1:]...), nil
}

func execRuleCmd(c *exec.Cmd, l *zap.Logger) {
	err := c.Run()
	if err != nil {
		l.Named("exec").Warn(
			"watch exec failed",
			zap.String("cmd", c.String()),
			zap.String("error", err.Error()),
		)
	}
}