package backup

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

// ComposeExecutor runs docker compose commands.
type ComposeExecutor struct {
	ProjectPath string
	ComposeFile string
}

// NewComposeExecutor creates an executor for a project.
func NewComposeExecutor(projectPath, composeFile string) *ComposeExecutor {
	return &ComposeExecutor{
		ProjectPath: projectPath,
		ComposeFile: composeFile,
	}
}

// Stop runs `docker compose -f <file> stop`.
func (e *ComposeExecutor) Stop(ctx context.Context) error {
	args := []string{"compose", "-f", e.ComposeFile, "stop"}
	cmd := exec.CommandContext(ctx, "docker", args...)
	cmd.Dir = e.ProjectPath
	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("docker compose stop: %w\n%s", err, string(out))
	}
	return nil
}

// Start runs `docker compose -f <file> up -d`.
func (e *ComposeExecutor) Start(ctx context.Context) error {
	args := []string{"compose", "-f", e.ComposeFile, "up", "-d"}
	cmd := exec.CommandContext(ctx, "docker", args...)
	cmd.Dir = e.ProjectPath
	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("docker compose up -d: %w\n%s", err, string(out))
	}
	return nil
}

// IsDockerAvailable checks whether docker is on PATH.
func IsDockerAvailable() bool {
	_, err := exec.LookPath("docker")
	return err == nil
}