package history

import (
	"fmt"
	"log"
	"time"

	"github.com/bouncepaw/mycorrhiza/util"
	"github.com/go-git/go-git/v5"
	// "github.com/go-git/go-git/v5/plumbing"
	"github.com/go-git/go-git/v5/plumbing/object"
)

/*
// 10 should be enough
const ShortHashLength = 10

type EditType int

const (
	TypeRename EditType = iota
	TypeDelete
	TypeEditText
	TypeEditBinary
)

type Revision struct {
	ShortHash [ShortHashLength]byte
	Type      EditType
}*/

var WikiRepo *git.Repository
var Worktree *git.Worktree

func Start(wikiDir string) {
	ry, err := git.PlainOpen(wikiDir)
	if err != nil {
		log.Fatal(err)
	}
	WikiRepo = ry
	Worktree, err = WikiRepo.Worktree()
	if err != nil {
		log.Fatal(err)
	}
	log.Println("Wiki repository found")
}

type HistoryOp struct {
	Errs      []error
	userMsg   string
	signature *object.Signature
	isDone    bool
}

// WithFiles stages all passed `paths`. Paths can be rooted or not.
func (hop *HistoryOp) WithFiles(paths ...string) *HistoryOp {
	for _, path := range paths {
		if _, err := Worktree.Add(util.ShorterPath(path)); err != nil {
			log.Println(err)
			hop.Errs = append(hop.Errs, err)
		}
	}
	return hop
}

// WithUserMsg sets what user message will be used for the future commit. If it == "", a default one be used. If user messages are not supported for this one type of history operation, this user message will be dropped. If user messages exceeds one line, it is stripped down.
func (hop *HistoryOp) WithUserMsg(userMsg string) *HistoryOp {
	// Isn't it too imperative?
	var firstLine string
	for _, ch := range userMsg {
		if ch == '\r' || ch == '\n' {
			break
		}
		firstLine += string(ch)
	}
	hop.userMsg = userMsg
	return hop
}

// WithSignature sets a signature for the future commit. You need to pass a username only, the rest is upon us (including email and time).
func (hop *HistoryOp) WithSignature(username string) *HistoryOp {
	hop.signature = &object.Signature{
		Name: username,
		// A fake email, why not
		Email: username + "@mycorrhiza",
		When:  time.Now(),
	}
	return hop
}

// Apply applies history operation by doing the commit. You can't apply the same operation more than once.
func (hop *HistoryOp) Apply() *HistoryOp {
	if !hop.isDone {
		opts := &git.CommitOptions{
			All:    false,
			Author: hop.signature,
		}
		err := opts.Validate(WikiRepo)
		if err != nil {
			hop.Errs = append(hop.Errs, err)
		}
		// TODO: work on this section:
		_, err = Worktree.Commit(hop.userMsg, opts)
		if err != nil {
			hop.Errs = append(hop.Errs, err)
		}
	}
	return hop
}

func CommitTest() {
	(&HistoryOp{}).
		WithUserMsg("This is a test commit").
		WithSignature("wikimind").
		Apply()
	log.Println("Made a test commit")
}

func StatusTable() (html string) {
	status, err := Worktree.Status()
	if err != nil {
		log.Fatal(err)
	}
	for path, stat := range status {
		html += fmt.Sprintf(`
	<tr>
		<td>%s</td>
		<td>%v</td>
	</tr>`, path, stat)
	}
	return `<table><tbody>` + html + `</tbody></table>`
}

func CommitsTable() (html string) {
	commitIter, err := WikiRepo.CommitObjects()
	if err != nil {
		log.Fatal(err)
	}
	err = commitIter.ForEach(func(commit *object.Commit) error {
		html += fmt.Sprintf(`
	<tr>
		<td>%v</td>
		<td>%v</td>
		<td>%s</td>
	</tr>`, commit.Hash, commit.Author, commit.Message)
		return nil
	})
	return `<table><tbody>` + html + `</tbody></table>`
}