// SPDX-FileCopyrightText: 2025 Romain Maneschi <romain@gitroot.dev>
//
// SPDX-License-Identifier: EUPL-1.2

package repository

import (
	"context"
	_ "embed"
	"fmt"
	"testing"

	"github.com/go-git/go-git/v6/plumbing"
	"gitroot.dev/server/configuration"
	"gitroot.dev/server/user"
)

//go:embed test_ressources/standard_README.md
var test_standard_README []byte

//go:embed test_ressources/standard_README_mod.md
var test_standard_README_mod []byte

//go:embed test_ressources/standard_README_diff.md
var test_standard_README_diff string

func TestGetDiff(t *testing.T) {
	dataDir := t.TempDir()
	conf := configuration.NewConfiguration(dataDir)
	userManager, _ := user.NewManager(conf)
	m := NewManager(conf, userManager)
	err := m.CreateUserRepo(context.TODO(), RepoConf{Name: "getDiff", DefaultBranch: "main"}, []user.SimpleUser{}, []byte(""))
	if err != nil {
		t.Fatal(err)
	}
	repo, err := m.Open(context.TODO(), "getDiff")
	if err != nil {
		t.Fatal(err)
	}
	repoWriter, err := repo.WillWrite(plumbing.HEAD)
	if err != nil {
		t.Fatal(err)
	}
	makeCommitForDiff(repoWriter, 1, test_standard_README, t, userManager)
	h := makeCommitForDiff(repoWriter, 1, test_standard_README_mod, t, userManager)

	res, err := repoWriter.GetDiff(h, "README.md", "README.md")
	if err != nil {
		t.Fatal(err)
	}

	if res != test_standard_README_diff {
		t.Errorf("have\n---\n%s\n---\nwant\n---\n%s\n---\n", res, test_standard_README_diff)
	}
}

func makeCommitForDiff(repo *GitRootRepositoryWrite, nb int, content []byte, t *testing.T, u *user.Manager) plumbing.Hash {
	if err := repo.Write("README.md", content); err != nil {
		t.Fatal(err)
	}
	h, err := repo.CommitAll(fmt.Sprintf("commit%d", nb), u.RootCommiter())
	if err != nil {
		t.Fatal(err)
	}
	return h
}