package gitcmd

import (
	"strconv"
	"strings"
)

func (r *Repository) ListCommitsByPath(ref, path string, limit int) ([]Commit, error) {
	if empty, err := r.IsEmpty(); err != nil {
		return nil, err
	} else if empty {
		return []Commit{}, nil
	}
	if ref == "" {
		ref = "HEAD"
	}

	cmd := NewCommand("log", "--follow").
		Add("--format=%H%x1f%h%x1f%s%x1f%an%x1f%ae%x1f%aI%x1f%P").
		WithDir(r.Path)
	if limit > 0 {
		cmd.Add("-n", strconv.Itoa(limit))
	}
	cmd.AddDynamicArguments(ref)
	cmd.AddDashesAndList(path)

	out, _, err := cmd.RunStdString(r.ctx)
	if err != nil {
		return nil, err
	}

	var commits []Commit
	for _, line := range strings.Split(strings.TrimSpace(out), "\n") {
		if line == "" {
			continue
		}
		commits = append(commits, *parseCommitLine(line))
	}
	return commits, nil
}