<?php

namespace classes;

use Exception;
use mysqli;

class db
{
    public mysqli $conn;
    private string $host;
    private string $user;
    private string $password;
    private string $database;

    public function __construct(array $config)
    {
        $this->host = $config['host'];
        $this->user = $config['user'];
        $this->password = $config['password'];
        $this->database = $config['database'];
    }

    public function connect(): void
    {
        global $response;
        try {
            $this->conn = new mysqli($this->host, $this->user, $this->password, $this->database);
        } catch (Exception $e) {
            $response->internal_server_error($e->getMessage());
        }
    }

    public function escape_string(string $string): string
    {
        return $this->conn->real_escape_string($string);
    }

    public function close(): void
    {
        $this->conn->close();
    }

    public function get(string $table, int $id)
    {
        $sql = "SELECT * FROM $table WHERE id = $id";
        $result = $this->query($sql);
        return $this->fetch_assoc($result);
    }

    public function query(string $sql): \mysqli_result|bool
    {
        // If the connection is not established, connect
        return $this->conn->query($sql);
    }

    public function fetch_assoc($result)
    {
        return $result->fetch_assoc();
    }

    public function list_objects(string $table): array
    {
        $sql = "SELECT * FROM $table";
        $result = $this->query($sql);
        return $this->fetch_all($result);
    }

    public function fetch_all($result)
    {
        return $result->fetch_all(MYSQLI_ASSOC);
    }

    public function list_objects_paginated(string $table, int $page, int $limit): array
    {
        $offset = ($page - 1) * $limit;
        $sql = "SELECT * FROM $table LIMIT $limit OFFSET $offset";
        $result = $this->query($sql);
        return $this->fetch_all($result);
    }

    public function count_objects(string $table): int
    {
        $sql = "SELECT COUNT(*) FROM $table";
        $result = $this->query($sql);
        return $result->fetch_row()[0];
    }

    public function add_object(string $table, array $data): void
    {
        $columns = implode(', ', array_keys($data));
        $values = implode("', '", array_values($data));
        $sql = "INSERT INTO $table ($columns) VALUES ('$values')";
        $this->query($sql);
    }

    public function insert_id(): int
    {
        return $this->conn->insert_id;
    }

    public function conn(): mysqli
    {
        return $this->conn;
    }

    public function prepare(string $sql): false|\mysqli_stmt
    {
        return $this->conn->prepare($sql);
    }

    public function num_rows(\mysqli_result|bool $result): int|string
    {
        return $result->num_rows;
    }
}