package syw

import (
	"strings"
	"time"
)

// Commit represents a git commit.
type Commit struct {
	Repo *Repository

	Hash    string
	Parents []string

	CommitterName  string
	CommitterEmail string
	CommitDate     time.Time

	AuthorName  string
	AuthorEmail string
	AuthorDate  time.Time

	Message string
}

// ParentHash returns a ref name usable to reach the commit's parent.
func (c *Commit) ParentHash() string {
	return c.Hash + "^"
}

// ShortMessage returns the first line of the commit message.
func (c *Commit) ShortMessage() string {
	short, _, _ := strings.Cut(c.Message, "\n")
	return short
}

// RestOfMessage returns all but the first line of the commit message.
//
// It will trim any newline prefixes however, so be aware that
// c.ShortMessage + "\n" + c.RestOfMessage may not produce the original
// commit message. For that use c.Message.
func (c *Commit) RestOfMessage() string {
	_, rest, _ := strings.Cut(c.Message, "\n")
	return strings.TrimPrefix(rest, "\n")
}