package lanegit

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

type Runner interface {
	Run(ctx context.Context, workdir string, env map[string]string, name string, args ...string) (string, error)
}

type ExecRunner struct{}

func (ExecRunner) Run(ctx context.Context, workdir string, env map[string]string, name string, args ...string) (string, error) {
	cmd := exec.CommandContext(ctx, name, args...)
	if strings.TrimSpace(workdir) != "" {
		cmd.Dir = workdir
	}
	cmd.Env = os.Environ()
	for key, value := range env {
		cmd.Env = append(cmd.Env, key+"="+value)
	}
	out, err := cmd.CombinedOutput()
	return strings.TrimSpace(string(out)), err
}

func Run(ctx context.Context, runner Runner, worktree string, env map[string]string, args ...string) (string, error) {
	out, err := runner.Run(ctx, worktree, env, "git", args...)
	if err == nil {
		return out, nil
	}
	out = strings.TrimSpace(out)
	if out == "" {
		return "", fmt.Errorf("git %s: %w", strings.Join(args, " "), err)
	}
	return "", fmt.Errorf("git %s: %s: %w", strings.Join(args, " "), out, err)
}

func IsExitCode(err error, code int) bool {
	var exitErr *exec.ExitError
	return errors.As(err, &exitErr) && exitErr.ExitCode() == code
}