<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

if ( ! function_exists( 'is_email' ) ) {
	function is_email( $v ): bool {
		return is_string( $v ) && (bool) filter_var( $v, FILTER_VALIDATE_EMAIL );
	}
}
if ( ! function_exists( 'wp_mail' ) ) {
	function wp_mail( $to, $subject, $body, $headers = '', $attachments = array() ): bool {
		$GLOBALS['_wpdo_mails'][] = compact( 'to', 'subject', 'body' );
		return true;
	}
}
if ( ! function_exists( 'sanitize_email' ) ) {
	function sanitize_email( $v ): string {
		return filter_var( (string) $v, FILTER_SANITIZE_EMAIL ) ?: '';
	}
}
if ( ! function_exists( '__' ) ) {
	function __( string $text, string $domain = 'default' ): string {
		return $text;
	}
}
if ( ! function_exists( 'home_url' ) ) {
	function home_url( string $path = '/' ): string {
		return 'https://example.test' . $path;
	}
}
if ( ! function_exists( 'admin_url' ) ) {
	function admin_url( string $path = '' ): string {
		return 'https://example.test/wp-admin/' . ltrim( $path, '/' );
	}
}

require_once dirname( __DIR__, 3 ) . '/includes/class-tmdo-logger.php';
require_once dirname( __DIR__, 3 ) . '/includes/notifications/class-tmdo-email-notifier.php';

/**
 * Unit tests for WPDO_Email_Notifier (v2.4.0 M10).
 */
class EmailNotifierTest extends TestCase {

	protected function setUp(): void {
		$GLOBALS['_wp_options'] = array();
		$GLOBALS['_wpdo_mails'] = array();
	}

	private function sample_summary( int $crit = 1 ): array {
		return array(
			'critical_count'    => $crit,
			'recommended_count' => 0,
			'ran_at'            => '2026-04-28 03:30:00',
			'tests'             => array(
				'wpdo_schema_drift' => array(
					'status'      => 'critical',
					'description' => 'Missing tables: wpdo_audit',
				),
				'wpdo_error_budget' => array(
					'status'      => 'good',
					'description' => 'OK',
				),
			),
		);
	}

	public function test_default_disabled(): void {
		$this->assertFalse( WPDO_Email_Notifier::is_enabled() );
	}

	public function test_recipient_falls_back_to_admin_email(): void {
		update_option( 'admin_email', 'admin@example.com', false );
		$this->assertSame( 'admin@example.com', WPDO_Email_Notifier::recipient() );

		update_option( 'wpdo_alert_email', 'alerts@example.com', false );
		$this->assertSame( 'alerts@example.com', WPDO_Email_Notifier::recipient() );
	}

	public function test_throttle_hours_clamps_to_range(): void {
		update_option( 'wpdo_alert_throttle_hours', 0, false );
		$this->assertSame( 1, WPDO_Email_Notifier::throttle_hours() );

		update_option( 'wpdo_alert_throttle_hours', 999, false );
		$this->assertSame( 168, WPDO_Email_Notifier::throttle_hours() );

		update_option( 'wpdo_alert_throttle_hours', 12, false );
		$this->assertSame( 12, WPDO_Email_Notifier::throttle_hours() );
	}

	public function test_maybe_send_skips_when_disabled(): void {
		$result = WPDO_Email_Notifier::maybe_send( $this->sample_summary() );
		$this->assertFalse( $result );
		$this->assertEmpty( $GLOBALS['_wpdo_mails'] );
	}

	public function test_maybe_send_sends_when_enabled(): void {
		update_option( 'wpdo_email_alerts_enabled', '1', false );
		update_option( 'wpdo_alert_email', 'ops@example.com', false );

		$result = WPDO_Email_Notifier::maybe_send( $this->sample_summary() );
		$this->assertTrue( $result );
		$this->assertCount( 1, $GLOBALS['_wpdo_mails'] );
		$mail = $GLOBALS['_wpdo_mails'][0];
		$this->assertSame( 'ops@example.com', $mail['to'] );
		$this->assertStringContainsString( 'wpdo_schema_drift', $mail['body'] );
		$this->assertStringContainsString( 'WPDO 警告', $mail['subject'] );
	}

	public function test_maybe_send_throttle_dedupes_same_fingerprint(): void {
		update_option( 'wpdo_email_alerts_enabled', '1', false );
		update_option( 'wpdo_alert_email', 'ops@example.com', false );
		$summary = $this->sample_summary();

		$first  = WPDO_Email_Notifier::maybe_send( $summary );
		$second = WPDO_Email_Notifier::maybe_send( $summary );
		$this->assertTrue( $first );
		$this->assertFalse( $second, '同 fingerprint 第 2 次應 throttle' );
		$this->assertCount( 1, $GLOBALS['_wpdo_mails'] );
	}

	public function test_maybe_send_skips_invalid_email(): void {
		update_option( 'wpdo_email_alerts_enabled', '1', false );
		update_option( 'wpdo_alert_email', 'not-an-email', false );

		$result = WPDO_Email_Notifier::maybe_send( $this->sample_summary() );
		$this->assertFalse( $result );
	}

	public function test_fingerprint_changes_with_critical_count(): void {
		update_option( 'wpdo_email_alerts_enabled', '1', false );
		update_option( 'wpdo_alert_email', 'ops@example.com', false );

		$first  = WPDO_Email_Notifier::maybe_send( $this->sample_summary( 1 ) );
		// Different critical_count → different fingerprint → not throttled.
		$second = WPDO_Email_Notifier::maybe_send( $this->sample_summary( 5 ) );
		$this->assertTrue( $first );
		$this->assertTrue( $second, '不同 critical_count 應視為不同警告' );
		$this->assertCount( 2, $GLOBALS['_wpdo_mails'] );
	}
}