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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Eco; |
| 6 | |
| 7 | use Eco\Contracts\ErrorCodeContract; |
| 8 | use Eco\Enums\ErrorCode; |
| 9 | |
| 10 | /** |
| 11 | * Represents an error carried by a failed {@see Result}. |
| 12 | * |
| 13 | * Immutable by design — every property is read-only and set only once |
| 14 | * at construction time. Use the semantic factory methods instead of |
| 15 | * calling the constructor directly. |
| 16 | * |
| 17 | * The $code property accepts any {@see ErrorCodeContract} implementation, |
| 18 | * so you can bring your own domain-specific enum: |
| 19 | * |
| 20 | * ```php |
| 21 | * enum AppErrorCode: string implements ErrorCodeContract |
| 22 | * { |
| 23 | * case UNAUTHORIZED = 'UNAUTHORIZED'; |
| 24 | * case INSUFFICIENT_BALANCE = 'INSUFFICIENT_BALANCE'; |
| 25 | * |
| 26 | * public function value(): string { return $this->value; } |
| 27 | * } |
| 28 | * |
| 29 | * // Then use it directly: |
| 30 | * Error::make(AppErrorCode::UNAUTHORIZED, 'Access denied.') |
| 31 | * Error::make(AppErrorCode::INSUFFICIENT_BALANCE, 'Not enough credits.', 'balance') |
| 32 | * ``` |
| 33 | */ |
| 34 | final class Error |
| 35 | { |
| 36 | /** |
| 37 | * @param ErrorCodeContract $code Machine-readable identifier. |
| 38 | * Use {@see ErrorCode} for built-in codes or |
| 39 | * your own enum implementing {@see ErrorCodeContract}. |
| 40 | * @param string $message Human-readable description of what went wrong. |
| 41 | * @param string $field The input field that caused the error, if applicable. |
| 42 | * Useful for mapping validation errors back to form fields. |
| 43 | */ |
| 44 | public function __construct( |
| 45 | public readonly ErrorCodeContract $code, |
| 46 | public readonly string $message, |
| 47 | public readonly string $field = '', |
| 48 | ) {} |
| 49 | |
| 50 | /** |
| 51 | * Creates an error with any code implementing {@see ErrorCodeContract}. |
| 52 | * |
| 53 | * This is the universal factory — use it for domain-specific codes |
| 54 | * that go beyond the built-in {@see ErrorCode} cases. |
| 55 | * |
| 56 | * ```php |
| 57 | * Error::make(AppErrorCode::UNAUTHORIZED, 'Access denied.') |
| 58 | * Error::make(AppErrorCode::INSUFFICIENT_BALANCE, 'Not enough credits.', 'balance') |
| 59 | * ``` |
| 60 | */ |
| 61 | public static function make(ErrorCodeContract $code, string $message, string $field = ''): self |
| 62 | { |
| 63 | return new self($code, $message, $field); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Creates a generic, unclassified error. |
| 68 | * Prefer {@see make()} with a specific code when the error type is known. |
| 69 | */ |
| 70 | public static function generic(string $message): self |
| 71 | { |
| 72 | return new self(ErrorCode::GENERIC, $message); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Creates a validation error tied to a specific input field. |
| 77 | * |
| 78 | * Use when user-provided data does not meet format or constraint rules |
| 79 | * (e.g. empty required field, invalid e-mail, value out of range). |
| 80 | * |
| 81 | * ```php |
| 82 | * Error::validation('email', 'Must be a valid e-mail address.') |
| 83 | * Error::validation('age', 'Must be at least 18.') |
| 84 | * ``` |
| 85 | */ |
| 86 | public static function validation(string $field, string $message): self |
| 87 | { |
| 88 | return new self(ErrorCode::VALIDATION, $message, $field); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Returns a structured array representation of this error. |
| 93 | * |
| 94 | * Empty values are filtered out so the output stays clean for JSON responses. |
| 95 | * |
| 96 | * ```php |
| 97 | * ['code' => 'VALIDATION_ERROR', 'message' => '...', 'field' => 'email'] |
| 98 | * ``` |
| 99 | */ |
| 100 | public function toArray(): array |
| 101 | { |
| 102 | return array_filter([ |
| 103 | 'code' => $this->code->value(), |
| 104 | 'message' => $this->message, |
| 105 | 'field' => $this->field ?: null, |
| 106 | ]); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Returns a human-readable string representation. |
| 111 | * Prefixes the message with the field name when present. |
| 112 | * |
| 113 | * Example output: |
| 114 | * - `[email] Must be a valid e-mail address. (VALIDATION_ERROR)` |
| 115 | * - `Access denied. (UNAUTHORIZED)` |
| 116 | */ |
| 117 | public function __toString(): string |
| 118 | { |
| 119 | $prefix = $this->field ? "[{$this->field}] " : ''; |
| 120 | |
| 121 | return "{$prefix}{$this->message} ({$this->code->value()})"; |
| 122 | } |
| 123 | } |