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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package repository

import (
	"context"
	"crypto/md5"
	"fmt"
	"image/png"
	"io"
	"strconv"
	"strings"

	"code.gitea.io/gitea/models/db"
	repo_model "code.gitea.io/gitea/models/repo"
	"code.gitea.io/gitea/modules/avatar"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/storage"
)

// UploadAvatar saves custom avatar for repository.
// FIXME: split uploads to different subdirs in case we have massive number of repos.
func UploadAvatar(repo *repo_model.Repository, data []byte) error {
	m, err := avatar.Prepare(data)
	if err != nil {
		return err
	}

	newAvatar := fmt.Sprintf("%d-%x", repo.ID, md5.Sum(data))
	if repo.Avatar == newAvatar { // upload the same picture
		return nil
	}

	ctx, committer, err := db.TxContext(db.DefaultContext)
	if err != nil {
		return err
	}
	defer committer.Close()

	oldAvatarPath := repo.CustomAvatarRelativePath()

	// Users can upload the same image to other repo - prefix it with ID
	// Then repo will be removed - only it avatar file will be removed
	repo.Avatar = newAvatar
	if err := repo_model.UpdateRepositoryCols(ctx, repo, "avatar"); err != nil {
		return fmt.Errorf("UploadAvatar: Update repository avatar: %w", err)
	}

	if err := storage.SaveFrom(storage.RepoAvatars, repo.CustomAvatarRelativePath(), func(w io.Writer) error {
		if err := png.Encode(w, *m); err != nil {
			log.Error("Encode: %v", err)
		}
		return err
	}); err != nil {
		return fmt.Errorf("UploadAvatar %s failed: Failed to remove old repo avatar %s: %w", repo.RepoPath(), newAvatar, err)
	}

	if len(oldAvatarPath) > 0 {
		if err := storage.RepoAvatars.Delete(oldAvatarPath); err != nil {
			return fmt.Errorf("UploadAvatar: Failed to remove old repo avatar %s: %w", oldAvatarPath, err)
		}
	}

	return committer.Commit()
}

// DeleteAvatar deletes the repos's custom avatar.
func DeleteAvatar(repo *repo_model.Repository) error {
	// Avatar not exists
	if len(repo.Avatar) == 0 {
		return nil
	}

	avatarPath := repo.CustomAvatarRelativePath()
	log.Trace("DeleteAvatar[%d]: %s", repo.ID, avatarPath)

	ctx, committer, err := db.TxContext(db.DefaultContext)
	if err != nil {
		return err
	}
	defer committer.Close()

	repo.Avatar = ""
	if err := repo_model.UpdateRepositoryCols(ctx, repo, "avatar"); err != nil {
		return fmt.Errorf("DeleteAvatar: Update repository avatar: %w", err)
	}

	if err := storage.RepoAvatars.Delete(avatarPath); err != nil {
		return fmt.Errorf("DeleteAvatar: Failed to remove %s: %w", avatarPath, err)
	}

	return committer.Commit()
}

// RemoveRandomAvatars removes the randomly generated avatars that were created for repositories
func RemoveRandomAvatars(ctx context.Context) error {
	return db.Iterate(ctx, nil, func(ctx context.Context, repository *repo_model.Repository) error {
		select {
		case <-ctx.Done():
			return db.ErrCancelledf("before random avatars removed for %s", repository.FullName())
		default:
		}
		stringifiedID := strconv.FormatInt(repository.ID, 10)
		if repository.Avatar == stringifiedID {
			return DeleteAvatar(repository)
		}
		return nil
	})
}

// generateAvatar generates the avatar from a template repository
func generateAvatar(ctx context.Context, templateRepo, generateRepo *repo_model.Repository) error {
	generateRepo.Avatar = strings.Replace(templateRepo.Avatar, strconv.FormatInt(templateRepo.ID, 10), strconv.FormatInt(generateRepo.ID, 10), 1)
	if _, err := storage.Copy(storage.RepoAvatars, generateRepo.CustomAvatarRelativePath(), storage.RepoAvatars, templateRepo.CustomAvatarRelativePath()); err != nil {
		return err
	}

	return repo_model.UpdateRepositoryCols(ctx, generateRepo, "avatar")
}