package git

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

	"gmgauthier.com/grokkit/internal/logger"
)

func Run(args []string) (string, error) {
	cmdStr := "git " + strings.Join(args, " ")
	logger.Debug("executing git command", "command", cmdStr, "args", args)

	out, err := exec.Command("git", args...).Output()
	if err != nil {
		logger.Error("git command failed",
			"command", cmdStr,
			"error", err)
		return "", fmt.Errorf("git command failed: %w", err)
	}

	outputLen := len(out)
	logger.Debug("git command completed",
		"command", cmdStr,
		"output_length", outputLen)

	return string(out), nil
}

func IsRepo() bool {
	logger.Debug("checking if directory is a git repository")
	_, err := exec.Command("git", "rev-parse", "--is-inside-work-tree").Output()
	isRepo := err == nil
	logger.Debug("git repository check completed", "is_repo", isRepo)
	return isRepo
}

func LatestTag() (string, error) {
	out, err := Run([]string{"describe", "--tags", "--abbrev=0"})
	if err != nil {
		return "", err
	}
	return strings.TrimSpace(out), nil
}

// PreviousTag returns the tag immediately before the given one.
func PreviousTag(current string) (string, error) {
	out, err := Run([]string{"describe", "--tags", "--abbrev=0", current + "^"})
	if err != nil {
		return "", err
	}
	return strings.TrimSpace(out), nil
}

// LogSince returns formatted commit log since the given ref (exactly matches the todo spec).
func LogSince(since string) (string, error) {
	args := []string{"log", "--pretty=format:%s%n%b%n---", since + "..HEAD"}
	return Run(args)
}