<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Tests for WPDO_Feature_Flags — 7-state lifecycle state machine.
 */
class FeatureFlagsTest extends TestCase {

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

	// ── State retrieval ──────────────────────────────────────────────────────

	public function test_unregistered_module_returns_idle(): void {
		$this->assertSame( 'idle', WPDO_Feature_Flags::get( 'hot_unknown' ) );
	}

	public function test_get_returns_stored_state(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'backfill' );
		$this->assertSame( 'backfill', WPDO_Feature_Flags::get( 'hot_hp_listing' ) );
	}

	// ── set() ─────────────────────────────────────────────────────────────────

	public function test_set_valid_state_returns_true(): void {
		$result = WPDO_Feature_Flags::set( 'mod', 'cutover' );
		$this->assertTrue( $result );
		$this->assertSame( 'cutover', WPDO_Feature_Flags::get( 'mod' ) );
	}

	public function test_set_invalid_state_returns_false(): void {
		$result = WPDO_Feature_Flags::set( 'mod', 'invalid_state_xyz' );
		$this->assertFalse( $result );
	}

	// ── Query-active check ──────────────────────────────────────────────────

	public function test_is_query_active_true_when_cutover(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'cutover' );
		$this->assertTrue( WPDO_Feature_Flags::is_query_active( 'hot_hp_listing' ) );
	}

	public function test_is_query_active_true_when_complete(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'complete' );
		$this->assertTrue( WPDO_Feature_Flags::is_query_active( 'hot_hp_listing' ) );
	}

	public function test_is_query_active_false_when_backfill(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'backfill' );
		$this->assertFalse( WPDO_Feature_Flags::is_query_active( 'hot_hp_listing' ) );
	}

	// ── is_write_active ──────────────────────────────────────────────────────

	public function test_is_write_active_true_when_dual_write(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'dual_write' );
		$this->assertTrue( WPDO_Feature_Flags::is_write_active( 'hot_hp_listing' ) );
	}

	public function test_is_write_active_false_when_idle(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'idle' );
		$this->assertFalse( WPDO_Feature_Flags::is_write_active( 'hot_hp_listing' ) );
	}

	// ── is_read_custom ───────────────────────────────────────────────────────

	public function test_is_read_custom_true_when_cutover(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'cutover' );
		$this->assertTrue( WPDO_Feature_Flags::is_read_custom( 'hot_hp_listing' ) );
	}

	public function test_is_read_custom_false_when_backfill(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'backfill' );
		$this->assertFalse( WPDO_Feature_Flags::is_read_custom( 'hot_hp_listing' ) );
	}

	// ── all() ────────────────────────────────────────────────────────────────

	public function test_all_returns_array_of_states(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'cutover' );
		WPDO_Feature_Flags::set( 'hot_hp_vendor', 'idle' );

		$all = WPDO_Feature_Flags::all();

		$this->assertIsArray( $all );
		$this->assertSame( 'cutover', $all['hot_hp_listing'] );
		$this->assertSame( 'idle', $all['hot_hp_vendor'] );
	}

	// ── reset() ─────────────────────────────────────────────────────────────

	public function test_reset_returns_module_to_idle(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'complete' );
		WPDO_Feature_Flags::reset( 'hot_hp_listing' );
		$this->assertSame( 'idle', WPDO_Feature_Flags::get( 'hot_hp_listing' ) );
	}

	// ── is_complete ──────────────────────────────────────────────────────────

	public function test_is_complete_true_when_complete(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'complete' );
		$this->assertTrue( WPDO_Feature_Flags::is_complete( 'hot_hp_listing' ) );
	}

	public function test_is_complete_false_when_cutover(): void {
		WPDO_Feature_Flags::set( 'hot_hp_listing', 'cutover' );
		$this->assertFalse( WPDO_Feature_Flags::is_complete( 'hot_hp_listing' ) );
	}
}