package models

import (
	"fmt"

	"github.com/jesseduffield/lazygit/pkg/utils"
)

// Special commit hash for empty tree object
const EmptyTreeCommitHash = "4b825dc642cb6eb9a060e54bf8d69288fbee4904"

// Commit : A git commit
type Commit struct {
	Sha           string
	Name          string
	Status        string // one of "unpushed", "pushed", "merged", "rebasing" or "selected"
	Action        string // one of "", "pick", "edit", "squash", "reword", "drop", "fixup"
	Tags          []string
	ExtraInfo     string // something like 'HEAD -> master, tag: v0.15.2'
	AuthorName    string // something like 'Jesse Duffield'
	AuthorEmail   string // something like 'jessedduffield@gmail.com'
	UnixTimestamp int64

	// SHAs of parent commits (will be multiple if it's a merge commit)
	Parents []string
}

func (c *Commit) ShortSha() string {
	return utils.ShortSha(c.Sha)
}

func (c *Commit) FullRefName() string {
	return c.Sha
}

func (c *Commit) RefName() string {
	return c.Sha
}

func (c *Commit) ParentRefName() string {
	if c.IsFirstCommit() {
		return EmptyTreeCommitHash
	}
	return c.RefName() + "^"
}

func (c *Commit) IsFirstCommit() bool {
	return len(c.Parents) == 0
}

func (c *Commit) ID() string {
	return c.RefName()
}

func (c *Commit) Description() string {
	return fmt.Sprintf("%s %s", c.Sha[:7], c.Name)
}

func (c *Commit) IsMerge() bool {
	return len(c.Parents) > 1
}

// returns true if this commit is not actually in the git log but instead
// is from a TODO file for an interactive rebase.
func (c *Commit) IsTODO() bool {
	return c.Action != ""
}

func IsHeadCommit(commits []*Commit, index int) bool {
	return !commits[index].IsTODO() && (index == 0 || commits[index-1].IsTODO())
}