<?php
/**
 * @author Daniel J. Summers <daniel@bitbadger.solutions>
 * @license MIT
 */

declare(strict_types=1);

namespace BitBadger\PDODocument\Query;

use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};

/**
 * Queries for counting documents
 */
class Count
{
    /**
     * Query to count all documents in a table
     *
     * @param string $tableName The name of the table in which documents should be counted
     * @return string The query to count all documents in a table
     */
    public static function all(string $tableName): string
    {
        return "SELECT COUNT(*) FROM $tableName";
    }

    /**
     * Query to count matching documents using a text comparison on JSON fields
     *
     * @param string $tableName The name of the table in which documents should be counted
     * @param Field[] $fields The field comparison to match
     * @param FieldMatch|null $match How to join multiple conditions (optional; defaults to All)
     * @return string The query to count documents using a field comparison
     * @throws DocumentException If the database mode has not been set
     */
    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
    {
        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $match);
    }

    /**
     * Query to count matching documents using a JSON containment query (PostgreSQL only)
     *
     * @param string $tableName The name of the table in which documents should be counted
     * @return string The query to count documents using a JSON containment query
     * @throws DocumentException If the database mode is not PostgreSQL
     */
    public static function byContains(string $tableName): string
    {
        return self::all($tableName) . ' WHERE ' . Query::whereDataContains();
    }

    /**
     * Query to count matching documents using a JSON Path match (PostgreSQL only)
     *
     * @param string $tableName The name of the table in which documents should be counted
     * @return string The query to count documents using a JSON Path match
     * @throws DocumentException If the database mode is not PostgreSQL
     */
    public static function byJsonPath(string $tableName): string
    {
        return self::all($tableName) . ' WHERE ' . Query::whereJsonPathMatches();
    }
}