package tenant

import (
	"context"
	"database/sql"
)

func (q *Queries) ListComments(ctx context.Context, postSlug string) ([]Comment, error) {
	rows, err := q.db.QueryContext(ctx, `SELECT id, user_id, post_slug, content, content_html, parent_id, created_at, updated_at
		FROM comments WHERE post_slug = ? ORDER BY created_at ASC`, postSlug)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var comments []Comment
	for rows.Next() {
		c, err := scanComment(rows)
		if err != nil {
			return nil, err
		}
		comments = append(comments, c)
	}
	return comments, rows.Err()
}

func (q *Queries) GetComment(ctx context.Context, id int64) (*Comment, error) {
	row := q.db.QueryRowContext(ctx, `SELECT id, user_id, post_slug, content, content_html, parent_id, created_at, updated_at
		FROM comments WHERE id = ?`, id)

	c, err := scanComment(row)
	if err == sql.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}
	return &c, nil
}

func (q *Queries) CreateComment(ctx context.Context, c *Comment) error {
	result, err := q.db.ExecContext(ctx, `INSERT INTO comments (user_id, post_slug, content, content_html, parent_id)
		VALUES (?, ?, ?, ?, ?)`,
		c.UserID, c.PostSlug, c.Content, nullStr(c.ContentHTML), c.ParentID)
	if err != nil {
		return err
	}
	c.ID, _ = result.LastInsertId()
	return nil
}

func (q *Queries) DeleteComment(ctx context.Context, id int64) error {
	_, err := q.db.ExecContext(ctx, `DELETE FROM comments WHERE id = ?`, id)
	return err
}

func scanComment(s scanner) (Comment, error) {
	var c Comment
	var contentHTML, createdAt, updatedAt sql.NullString

	err := s.Scan(&c.ID, &c.UserID, &c.PostSlug, &c.Content, &contentHTML, &c.ParentID, &createdAt, &updatedAt)
	if err != nil {
		return c, err
	}

	c.ContentHTML = contentHTML.String
	c.CreatedAt = parseTime(createdAt.String)
	c.UpdatedAt = parseTime(updatedAt.String)
	return c, nil
}