package gitutil

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

	"gitocean/internal/model"
	"gitocean/internal/validate"
)

func Run(dir string, args ...string) error {
	cmd := exec.Command("git", args...)
	if dir != "" {
		cmd.Dir = dir
	}
	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("git %s failed: %s", strings.Join(args, " "), strings.TrimSpace(string(out)))
	}
	return nil
}

func InitBare(path string) error {
	if err := Run("", "init", "--bare", path); err != nil {
		return err
	}
	return Run("", "--git-dir", path, "symbolic-ref", "HEAD", "refs/heads/main")
}

func BranchExists(repoPath, branch string) bool {
	if !validate.Branch(branch) {
		return false
	}
	cmd := exec.Command("git", "--git-dir", repoPath, "rev-parse", "--verify", "refs/heads/"+branch)
	return cmd.Run() == nil
}

func Refs(repoPath, prefix string) ([]model.RefInfo, error) {
	cmd := exec.Command("git", "--git-dir", repoPath, "for-each-ref", "--format=%(refname:short)%00%(objectname)%00%(committerdate:iso8601)%00%(subject)", prefix)
	out, err := cmd.CombinedOutput()
	if err != nil {
		return nil, fmt.Errorf("git refs failed: %s", strings.TrimSpace(string(out)))
	}
	var refs []model.RefInfo
	for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
		if line == "" {
			continue
		}
		parts := strings.SplitN(line, "\x00", 4)
		if len(parts) < 4 {
			continue
		}
		date, _ := time.Parse("2006-01-02 15:04:05 -0700", parts[2])
		refs = append(refs, model.RefInfo{Name: parts[0], Commit: parts[1], Date: date, Message: parts[3]})
	}
	return refs, nil
}