<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Tests for WPDO_Zone_Classifier — zone suggestion engine.
 *
 * Tests private static methods via PHP Reflection.
 */
class ZoneClassifierTest extends TestCase {

	/**
	 * Invoke a private static method on WPDO_Zone_Classifier via reflection.
	 */
	private function invoke_private( string $method, array $args ): mixed {
		$ref = new ReflectionClass( WPDO_Zone_Classifier::class );
		$m   = $ref->getMethod( $method );
		$m->setAccessible( true );
		return $m->invokeArgs( null, $args );
	}

	// ── is_wp_internal() ─────────────────────────────────────────────────────

	public function test_is_wp_internal_returns_true_for_edit_lock(): void {
		$result = $this->invoke_private( 'is_wp_internal', [ '_edit_lock' ] );
		$this->assertTrue( $result );
	}

	public function test_is_wp_internal_returns_true_for_thumbnail_id(): void {
		$result = $this->invoke_private( 'is_wp_internal', [ '_thumbnail_id' ] );
		$this->assertTrue( $result );
	}

	public function test_is_wp_internal_returns_false_for_hp_price(): void {
		$result = $this->invoke_private( 'is_wp_internal', [ 'hp_price' ] );
		$this->assertFalse( $result );
	}

	public function test_is_wp_internal_returns_false_for_custom_key(): void {
		$result = $this->invoke_private( 'is_wp_internal', [ 'my_custom_meta' ] );
		$this->assertFalse( $result );
	}

	// ── score_zones() — hot ──────────────────────────────────────────────────

	public function test_score_zones_hot_for_numeric_short_values(): void {
		$signals = $this->make_signals( [
			'avg_length'      => 10,
			'numeric_ratio'   => 0.9,
			'distinct_values' => 5,
		] );

		$scores = $this->invoke_private( 'score_zones', [ $signals ] );

		// Hot should outrank cold and archive.
		$this->assertGreaterThan( $scores['cold'],    $scores['hot'] );
		$this->assertGreaterThan( $scores['archive'], $scores['hot'] );
	}

	// ── score_zones() — warm ─────────────────────────────────────────────────

	public function test_score_zones_warm_for_transient_prefix(): void {
		$signals = $this->make_signals( [ 'prefix' => 'transient' ] );

		$scores = $this->invoke_private( 'score_zones', [ $signals ] );

		$this->assertGreaterThanOrEqual( 0.8, $scores['warm'] );
	}

	// ── score_zones() — cold ─────────────────────────────────────────────────

	public function test_score_zones_cold_for_long_json_values(): void {
		$signals = $this->make_signals( [
			'avg_length' => 300,
			'is_json'    => true,
		] );

		$scores = $this->invoke_private( 'score_zones', [ $signals ] );

		$this->assertGreaterThan( $scores['hot'],     $scores['cold'] );
		$this->assertGreaterThan( $scores['archive'], $scores['cold'] );
	}

	// ── score_zones() — archive ──────────────────────────────────────────────

	public function test_score_zones_archive_for_high_trash_ratio(): void {
		$signals = $this->make_signals( [ 'trash_ratio' => 0.7 ] );

		$scores = $this->invoke_private( 'score_zones', [ $signals ] );

		$this->assertGreaterThanOrEqual( 0.6, $scores['archive'] );
	}

	// ── score_zones() — default ───────────────────────────────────────────────

	public function test_score_zones_defaults_cold_when_no_signals(): void {
		$signals = $this->make_signals( [] );

		$scores = $this->invoke_private( 'score_zones', [ $signals ] );

		// With avg_length=0, numeric_ratio=0, etc., hot gets 0.3 (avg_length<50 is true for 0).
		// Cold must have at least a non-zero score (either from scoring or the fallback).
		$max = max( $scores );
		$this->assertGreaterThan( 0.0, $max );
		$this->assertGreaterThan( 0.0, $scores['cold'] + $scores['hot'] ); // At least one has a score.
	}

	// ── build_reasons() ──────────────────────────────────────────────────────

	public function test_build_reasons_hot_includes_numeric_message(): void {
		$signals = $this->make_signals( [
			'avg_length'      => 10,
			'numeric_ratio'   => 0.9,
			'distinct_values' => 5,
		] );

		$reasons = $this->invoke_private( 'build_reasons', [ $signals, 'hot' ] );

		$combined = implode( ' ', $reasons );
		$this->assertStringContainsStringIgnoringCase( 'numeric', $combined );
	}

	// ── Helpers ───────────────────────────────────────────────────────────────

	/**
	 * Build a signals array with defaults, overriding specific keys.
	 */
	private function make_signals( array $overrides ): array {
		return array_merge( [
			'meta_key'        => 'test_key',
			'row_count'       => 100,
			'avg_length'      => 0,
			'max_length'      => 0,
			'distinct_values' => 0,
			'numeric_ratio'   => 0.0,
			'trash_ratio'     => 0.0,
			'is_serialized'   => false,
			'is_json'         => false,
			'prefix'          => '',
		], $overrides );
	}
}