package git

import (
	"errors"
	"fmt"
	"regexp"
	"strings"

	"cnb.cool/looc/git-cnb/cmd"
)

var GlobalFlags []string

func gitCmd(args ...string) *cmd.Cmd {
	c := cmd.New("git")
	for _, v := range GlobalFlags {
		c.WithArg(v)
	}
	for _, a := range args {
		c.WithArg(a)
	}

	return c
}

func isGitDir() error {
	dirCmd := gitCmd("rev-parse", "-q", "--git-dir")
	dirCmd.Stderr = nil
	_, err := dirCmd.Output()
	if err != nil {
		return fmt.Errorf("Not a git repository (or any of the parent directories): .git")
	}
	return nil
}

func Remote() (string, error) {
	err := isGitDir()
	if err != nil {
		return "", err
	}
	remoteCmd := gitCmd("remote", "-v")
	remoteCmd.Stderr = nil
	output, _ := remoteCmd.Output()
	lines := outputLines(output)
	if len(lines) == 0 {
		return "", errors.New("have no remote url")
	}
	re := regexp.MustCompile(`\s+`)
	return re.Split(lines[0], -1)[1], nil
}

func outputLines(output string) []string {
	output = strings.TrimSuffix(output, "\n")
	if output == "" {
		return []string{}
	}
	return strings.Split(output, "\n")
}