// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package indexer

import (
	"context"

	issues_model "code.gitea.io/gitea/models/issues"
	repo_model "code.gitea.io/gitea/models/repo"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/git"
	code_indexer "code.gitea.io/gitea/modules/indexer/code"
	issue_indexer "code.gitea.io/gitea/modules/indexer/issues"
	stats_indexer "code.gitea.io/gitea/modules/indexer/stats"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/notification/base"
	"code.gitea.io/gitea/modules/repository"
	"code.gitea.io/gitea/modules/setting"
)

type indexerNotifier struct {
	base.NullNotifier
}

var _ base.Notifier = &indexerNotifier{}

// NewNotifier create a new indexerNotifier notifier
func NewNotifier() base.Notifier {
	return &indexerNotifier{}
}

func (r *indexerNotifier) NotifyCreateIssueComment(ctx context.Context, doer *user_model.User, repo *repo_model.Repository,
	issue *issues_model.Issue, comment *issues_model.Comment, mentions []*user_model.User,
) {
	if comment.Type == issues_model.CommentTypeComment {
		if issue.Comments == nil {
			if err := issue.LoadDiscussComments(ctx); err != nil {
				log.Error("LoadDiscussComments failed: %v", err)
				return
			}
		} else {
			issue.Comments = append(issue.Comments, comment)
		}

		issue_indexer.UpdateIssueIndexer(issue)
	}
}

func (r *indexerNotifier) NotifyNewIssue(ctx context.Context, issue *issues_model.Issue, mentions []*user_model.User) {
	issue_indexer.UpdateIssueIndexer(issue)
}

func (r *indexerNotifier) NotifyNewPullRequest(ctx context.Context, pr *issues_model.PullRequest, mentions []*user_model.User) {
	issue_indexer.UpdateIssueIndexer(pr.Issue)
}

func (r *indexerNotifier) NotifyUpdateComment(ctx context.Context, doer *user_model.User, c *issues_model.Comment, oldContent string) {
	if c.Type == issues_model.CommentTypeComment {
		var found bool
		if c.Issue.Comments != nil {
			for i := 0; i < len(c.Issue.Comments); i++ {
				if c.Issue.Comments[i].ID == c.ID {
					c.Issue.Comments[i] = c
					found = true
					break
				}
			}
		}

		if !found {
			if err := c.Issue.LoadDiscussComments(ctx); err != nil {
				log.Error("LoadDiscussComments failed: %v", err)
				return
			}
		}

		issue_indexer.UpdateIssueIndexer(c.Issue)
	}
}

func (r *indexerNotifier) NotifyDeleteComment(ctx context.Context, doer *user_model.User, comment *issues_model.Comment) {
	if comment.Type == issues_model.CommentTypeComment {
		if err := comment.LoadIssue(ctx); err != nil {
			log.Error("LoadIssue: %v", err)
			return
		}

		var found bool
		if comment.Issue.Comments != nil {
			for i := 0; i < len(comment.Issue.Comments); i++ {
				if comment.Issue.Comments[i].ID == comment.ID {
					comment.Issue.Comments = append(comment.Issue.Comments[:i], comment.Issue.Comments[i+1:]...)
					found = true
					break
				}
			}
		}

		if !found {
			if err := comment.Issue.LoadDiscussComments(ctx); err != nil {
				log.Error("LoadDiscussComments failed: %v", err)
				return
			}
		}
		// reload comments to delete the old comment
		issue_indexer.UpdateIssueIndexer(comment.Issue)
	}
}

func (r *indexerNotifier) NotifyDeleteRepository(ctx context.Context, doer *user_model.User, repo *repo_model.Repository) {
	issue_indexer.DeleteRepoIssueIndexer(ctx, repo)
	if setting.Indexer.RepoIndexerEnabled {
		code_indexer.UpdateRepoIndexer(repo)
	}
}

func (r *indexerNotifier) NotifyMigrateRepository(ctx context.Context, doer, u *user_model.User, repo *repo_model.Repository) {
	issue_indexer.UpdateRepoIndexer(ctx, repo)
	if setting.Indexer.RepoIndexerEnabled && !repo.IsEmpty {
		code_indexer.UpdateRepoIndexer(repo)
	}
	if err := stats_indexer.UpdateRepoIndexer(repo); err != nil {
		log.Error("stats_indexer.UpdateRepoIndexer(%d) failed: %v", repo.ID, err)
	}
}

func (r *indexerNotifier) NotifyPushCommits(ctx context.Context, pusher *user_model.User, repo *repo_model.Repository, opts *repository.PushUpdateOptions, commits *repository.PushCommits) {
	if setting.Indexer.RepoIndexerEnabled && opts.RefFullName == git.BranchPrefix+repo.DefaultBranch {
		code_indexer.UpdateRepoIndexer(repo)
	}
	if err := stats_indexer.UpdateRepoIndexer(repo); err != nil {
		log.Error("stats_indexer.UpdateRepoIndexer(%d) failed: %v", repo.ID, err)
	}
}

func (r *indexerNotifier) NotifySyncPushCommits(ctx context.Context, pusher *user_model.User, repo *repo_model.Repository, opts *repository.PushUpdateOptions, commits *repository.PushCommits) {
	// opts.RefFullName may occasionally be set to just the branch name, like 'master', without
	// the preceding 'refs/heads/` text, hence we match for both with and without the branch
	// prefix
	// e.g.
	// remote: Enumerating objects: 1544, done.
	// remote: Counting objects: 100% (1154/1154), done.
	// remote: Compressing objects: 100% (155/155), done.
	// remote: Total 1544 (delta 1022), reused 1078 (delta 996), pack-reused 390
	// Receiving objects: 100% (1544/1544), 2.16 MiB | 13.15 MiB/s, done.
	// Resolving deltas: 100% (1092/1092), completed with 439 local objects.
	// From https://github.com/go-gitea/gitea
	//    698188530..cf1a7b08e  main          -> origin/main
	if setting.Indexer.RepoIndexerEnabled && (opts.RefFullName == git.BranchPrefix+repo.DefaultBranch || opts.RefFullName == repo.DefaultBranch) {
		code_indexer.UpdateRepoIndexer(repo)
	}
	if err := stats_indexer.UpdateRepoIndexer(repo); err != nil {
		log.Error("stats_indexer.UpdateRepoIndexer(%d) failed: %v", repo.ID, err)
	}
}

func (r *indexerNotifier) NotifyIssueChangeContent(ctx context.Context, doer *user_model.User, issue *issues_model.Issue, oldContent string) {
	issue_indexer.UpdateIssueIndexer(issue)
}

func (r *indexerNotifier) NotifyIssueChangeTitle(ctx context.Context, doer *user_model.User, issue *issues_model.Issue, oldTitle string) {
	issue_indexer.UpdateIssueIndexer(issue)
}

func (r *indexerNotifier) NotifyIssueChangeRef(ctx context.Context, doer *user_model.User, issue *issues_model.Issue, oldRef string) {
	issue_indexer.UpdateIssueIndexer(issue)
}