// Copyright 2026 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package issues

import (
	"context"

	"code.gitea.io/gitea/models/db"
)

// FileCommitComments holds commit comments for a single file,
// split by side (left = old, right = new) with int keys matching DiffLine indices.
type FileCommitComments struct {
	Left  map[int][]*Comment
	Right map[int][]*Comment
}

// CommitCommentsForDiff maps file paths to their commit comments.
type CommitCommentsForDiff map[string]*FileCommitComments

// FindCommitCommentsByCommitSHA returns all comments for a given commit in a repo.
func FindCommitCommentsByCommitSHA(ctx context.Context, repoID int64, commitSHA string) ([]*Comment, error) {
	comments := make([]*Comment, 0)
	if err := db.GetEngine(ctx).
		Where("repo_id = ? AND commit_sha = ? AND type = ?", repoID, commitSHA, CommentTypeCommitComment).
		OrderBy("created_unix ASC").
		Find(&comments); err != nil {
		return nil, err
	}

	if err := CommentList(comments).LoadPosters(ctx); err != nil {
		return nil, err
	}

	return comments, nil
}

// FindCommitCommentsForDiff returns comments grouped by path and side for rendering in a diff view.
func FindCommitCommentsForDiff(ctx context.Context, repoID int64, commitSHA string) (CommitCommentsForDiff, error) {
	comments, err := FindCommitCommentsByCommitSHA(ctx, repoID, commitSHA)
	if err != nil {
		return nil, err
	}

	result := make(CommitCommentsForDiff)
	for _, c := range comments {
		fcc, ok := result[c.TreePath]
		if !ok {
			fcc = &FileCommitComments{
				Left:  make(map[int][]*Comment),
				Right: make(map[int][]*Comment),
			}
			result[c.TreePath] = fcc
		}
		if c.Line < 0 {
			idx := int(-c.Line)
			fcc.Left[idx] = append(fcc.Left[idx], c)
		} else {
			idx := int(c.Line)
			fcc.Right[idx] = append(fcc.Right[idx], c)
		}
	}
	return result, nil
}

// CreateCommitComment creates a Comment with type CommitComment.
func CreateCommitComment(ctx context.Context, comment *Comment) error {
	comment.Type = CommentTypeCommitComment
	_, err := db.GetEngine(ctx).Insert(comment)
	return err
}

// DeleteCommitComment deletes a commit comment by ID, verifying it belongs to the given repo.
func DeleteCommitComment(ctx context.Context, repoID, commentID int64) error {
	_, err := db.GetEngine(ctx).
		Where("id = ? AND repo_id = ? AND type = ?", commentID, repoID, CommentTypeCommitComment).
		Delete(&Comment{})
	return err
}

// GetCommitCommentByID returns a commit comment by ID, verifying it belongs to the given repo.
func GetCommitCommentByID(ctx context.Context, repoID, commentID int64) (*Comment, error) {
	c := &Comment{}
	has, err := db.GetEngine(ctx).
		Where("id = ? AND repo_id = ? AND type = ?", commentID, repoID, CommentTypeCommitComment).
		Get(c)
	if err != nil {
		return nil, err
	}
	if !has {
		return nil, db.ErrNotExist{Resource: "CommitComment", ID: commentID}
	}
	return c, nil
}