<?php

declare(strict_types=1);

namespace Core;

class Validator
{
    protected array $errors = [];

    public function required(string $field, mixed $value, string $message = ''): self
    {
        if ($value === null || trim((string) $value) === '') {
            $this->errors[$field][] = $message ?: "{$field} is required.";
        }

        return $this;
    }

    public function maxLength(string $field, mixed $value, int $max, string $message = ''): self
    {
        if (strlen((string) $value) > $max) {
            $this->errors[$field][] = $message ?: "{$field} must be {$max} characters or fewer.";
        }

        return $this;
    }

    public function numeric(string $field, mixed $value, string $message = ''): self
    {
        if (!is_numeric($value)) {
            $this->errors[$field][] = $message ?: "{$field} must be numeric.";
        }

        return $this;
    }

    public function email(string $field, mixed $value, string $message = ''): self
    {
        if ((string) $value !== '' && filter_var($value, FILTER_VALIDATE_EMAIL) === false) {
            $this->errors[$field][] = $message ?: "{$field} must be a valid email address.";
        }

        return $this;
    }

    public function date(string $field, mixed $value, string $format = 'Y-m-d', string $message = ''): self
    {
        $str = (string) $value;

        if ($str === '') {
            return $this;
        }

        $parsed = \DateTimeImmutable::createFromFormat($format, $str);

        if ($parsed === false || $parsed->format($format) !== $str) {
            $this->errors[$field][] = $message ?: "{$field} must be a valid date ({$format}).";
        }

        return $this;
    }

    public function minLength(string $field, mixed $value, int $min, string $message = ''): self
    {
        if (strlen((string) $value) < $min) {
            $this->errors[$field][] = $message ?: "{$field} must be at least {$min} characters.";
        }

        return $this;
    }

    public function min(string $field, mixed $value, int|float $min, string $message = ''): self
    {
        if (!is_numeric($value) || (float) $value < $min) {
            $this->errors[$field][] = $message ?: "{$field} must be at least {$min}.";
        }

        return $this;
    }

    public function max(string $field, mixed $value, int|float $max, string $message = ''): self
    {
        if (!is_numeric($value) || (float) $value > $max) {
            $this->errors[$field][] = $message ?: "{$field} must be no more than {$max}.";
        }

        return $this;
    }

    public function in(string $field, mixed $value, array $allowed, string $message = ''): self
    {
        if (!in_array($value, $allowed, true)) {
            $this->errors[$field][] = $message ?: "{$field} must be one of: " . implode(', ', $allowed) . '.';
        }

        return $this;
    }

    public function passes(): bool
    {
        return empty($this->errors);
    }

    public function fails(): bool
    {
        return !$this->passes();
    }

    public function errors(): array
    {
        return $this->errors;
    }
}