<?php

namespace App\Models;

use PDOException;

abstract class Model
{
    protected \PDO $pdo;
    protected string $table;
    protected array $fillable = [];
    protected array $hidden = [];
    protected array $casts = [];

    public function __construct(\PDO $pdo)
    {
        $this->pdo = $pdo;
    }

    public function find(int $id): ?array
    {
        $stmt = $this->pdo->prepare("SELECT * FROM {$this->table} WHERE id = :id");
        $stmt->execute(['id' => $id]);
        return $stmt->fetch(\PDO::FETCH_ASSOC) ?: null;
    }

    public function findAll(array $conditions = []): array
    {
        $whereClause = $this->buildWhereClause($conditions);
        $sql = "SELECT * FROM {$this->table} {$whereClause['sql']}";
        $stmt = $this->pdo->prepare($sql);
        $stmt->execute($whereClause['params']);
        return $stmt->fetchAll(\PDO::FETCH_ASSOC);
    }

    public function create(array $data): ?int
    {
        $filteredData = array_intersect_key($data, array_flip($this->fillable));
        $columns = array_keys($filteredData);
        $placeholders = array_map(fn($col) => ":$col", $columns);
        $sql = "INSERT INTO {$this->table} (" . implode(', ', $columns) . ") VALUES (" . implode(', ', $placeholders) . ")";
        $stmt = $this->pdo->prepare($sql);
        $stmt->execute($filteredData);
        return (int) $this->pdo->lastInsertId();
    }

    public function update(int $id, array $data): bool
    {
        $filteredData = array_intersect_key($data, array_flip($this->fillable));
        if (empty($filteredData)) {
            return false;
        }

        $setClause = array_map(fn($col) => "$col = :$col", array_keys($filteredData));
        $sql = "UPDATE {$this->table} SET " . implode(', ', $setClause) . " WHERE id = :id";
        $filteredData['id'] = $id;

        $stmt = $this->pdo->prepare($sql);
        return $stmt->execute($filteredData);
    }

    public function delete(int $id): bool
    {
        $stmt = $this->pdo->prepare("DELETE FROM {$this->table} WHERE id = :id");
        return $stmt->execute(['id' => $id]);
    }

    public function count(array $conditions = []): int
    {
        $whereClause = $this->buildWhereClause($conditions);
        $sql = "SELECT COUNT(*) FROM {$this->table} {$whereClause['sql']}";
        $stmt = $this->pdo->prepare($sql);
        $stmt->execute($whereClause['params']);
        return (int) $stmt->fetchColumn();
    }

    protected function buildWhereClause(array $conditions): array
    {
        if (empty($conditions)) {
            return ['sql' => '', 'params' => []];
        }

        $parts = [];
        $params = [];

        foreach ($conditions as $column => $value) {
            if (is_array($value)) {
                $parts[] = "$column IN (" . implode(', ', array_map(fn($k) => ":$column$k", array_keys($value))) . ")";
                foreach ($value as $k => $v) {
                    $params["$column$k"] = $v;
                }
            } else {
                $parts[] = "$column = :$column";
                $params[$column] = $value;
            }
        }

        return [
            'sql' => 'WHERE ' . implode(' AND ', $parts),
            'params' => $params
        ];
    }

    public function getTable(): string
    {
        return $this->table;
    }
}