<?php
declare(strict_types=1);

namespace WPMultiCity\Tests;

use WPMultiCity\Router;

final class RouterTest extends TestCase
{
    public function test_register_attaches_wp_action_at_priority_9999(): void
    {
        Router::register();

        self::assertSame(
            9999,
            has_action('wp', [Router::class, 'route']),
            'Router::register() must hook wp action at priority 9999'
        );
    }

    public function test_register_attaches_query_vars_filter(): void
    {
        Router::register();

        self::assertNotFalse(
            has_filter('query_vars', [Router::class, 'add_town_query_var']),
            'Router::register() must hook query_vars filter'
        );
    }

    public function test_add_town_query_var_appends_town(): void
    {
        $vars = ['p', 'page_id'];
        $result = Router::add_town_query_var($vars);

        self::assertContains('town', $result);
    }

    public function test_route_skips_when_is_admin(): void
    {
        \Brain\Monkey\Functions\expect('get_terms')->never();
        \Brain\Monkey\Functions\when('is_admin')->justReturn(true);

        Router::route();

        self::assertArrayNotHasKey('wp_query', $GLOBALS);
    }

    public function test_route_skips_when_current_town_is_null(): void
    {
        \Brain\Monkey\Functions\expect('url_to_postid')->never();
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/something-not-a-city/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([10 => 'spb']);
        \Brain\Monkey\Functions\when('get_field')->justReturn(false);

        Router::route();

        self::assertArrayNotHasKey('wp_query', $GLOBALS);
    }

    public function test_route_skips_when_current_town_equals_main_town(): void
    {
        \Brain\Monkey\Functions\expect('url_to_postid')->never();
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/spb/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([10 => 'spb']);
        \Brain\Monkey\Functions\when('get_field')->alias(function ($name) {
            if ($name === 'main_town_slug') return 'spb';
            return false;
        });

        Router::route();

        self::assertArrayNotHasKey('wp_query', $GLOBALS);
    }

    public function test_route_skips_when_path_not_routable(): void
    {
        \Brain\Monkey\Functions\expect('url_to_postid')->never();
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/privacy/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);
        \Brain\Monkey\Functions\when('get_field')->alias(function ($name) {
            if ($name === 'main_town_slug') return 'spb';
            if ($name === 'page_no_rep') return [['link' => '/privacy/']];
            return false;
        });

        Router::route();

        self::assertArrayNotHasKey('wp_query', $GLOBALS);
    }

    public function test_route_uses_main_page_alt_term_meta_for_root_url(): void
    {
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);

        $term = new \WP_Term();
        $term->term_id = 11;
        $term->slug = 'tyumen';
        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);

        \Brain\Monkey\Functions\when('get_field')->alias(function ($name, $where = null) {
            if ($name === 'main_town_slug') return 'spb';
            if ($name === 'page_no_rep') return false;
            if ($name === 'main_page_alt' && $where === 'town_11') return 555;
            return false;
        });
        \Brain\Monkey\Functions\when('get_post')->justReturn((object) ['ID' => 555]);
        \Brain\Monkey\Functions\when('status_header')->justReturn(null);

        Router::route();

        self::assertInstanceOf(\WP_Query::class, $GLOBALS['wp_query']);
        self::assertSame(555, $GLOBALS['wp_query']->constructor_args['page_id']);
        self::assertSame('tyumen', $GLOBALS['wp_query']->constructor_args['town']);
        self::assertTrue($GLOBALS['wp_query']->is_front_page);
        self::assertTrue($GLOBALS['wp_query']->is_page);
    }

    public function test_route_falls_back_to_index_town_alt_option(): void
    {
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);

        $term = new \WP_Term();
        $term->term_id = 11;
        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);

        \Brain\Monkey\Functions\when('get_field')->alias(function ($name, $where = null) {
            if ($name === 'main_town_slug') return 'spb';
            if ($name === 'page_no_rep') return false;
            if ($name === 'main_page_alt') return 0;
            if ($name === 'index_town_alt') return 777;
            return false;
        });
        \Brain\Monkey\Functions\when('get_post')->justReturn((object) ['ID' => 777]);
        \Brain\Monkey\Functions\when('status_header')->justReturn(null);

        Router::route();

        self::assertSame(777, $GLOBALS['wp_query']->constructor_args['page_id']);
    }

    public function test_route_does_not_install_query_when_neither_main_nor_fallback_set(): void
    {
        \Brain\Monkey\Functions\expect('get_post')->never();
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);

        $term = new \WP_Term();
        $term->term_id = 11;
        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);

        \Brain\Monkey\Functions\when('get_field')->alias(function ($name) {
            if ($name === 'main_town_slug') return 'spb';
            return false;
        });

        Router::route();

        self::assertArrayNotHasKey('wp_query', $GLOBALS);
    }

    public function test_route_resolves_internal_page_via_url_to_postid(): void
    {
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/about/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);
        \Brain\Monkey\Functions\when('get_field')->alias(function ($name) {
            if ($name === 'main_town_slug') return 'spb';
            return false;
        });
        \Brain\Monkey\Functions\when('get_term_by')->justReturn(false);
        \Brain\Monkey\Functions\expect('url_to_postid')
            ->once()
            ->with('/about/')
            ->andReturn(42);
        \Brain\Monkey\Functions\when('get_post')->justReturn((object) ['ID' => 42]);
        \Brain\Monkey\Functions\when('status_header')->justReturn(null);

        Router::route();

        self::assertSame(42, $GLOBALS['wp_query']->constructor_args['page_id']);
        self::assertSame('tyumen', $GLOBALS['wp_query']->constructor_args['town']);
        self::assertTrue($GLOBALS['wp_query']->is_page);
    }

    public function test_route_applies_page_unic_swap_when_clone_exists(): void
    {
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/about/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);

        $term = new \WP_Term();
        $term->term_id = 11;
        $term->slug = 'tyumen';
        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);

        \Brain\Monkey\Functions\when('get_field')->alias(function ($name) {
            if ($name === 'main_town_slug') return 'spb';
            if ($name === 'page_unic') return [
                ['town' => 11, 'page_old' => 42, 'page_new' => 84],
            ];
            return false;
        });
        \Brain\Monkey\Functions\when('url_to_postid')->justReturn(42);
        \Brain\Monkey\Functions\when('get_post')->justReturn((object) ['ID' => 84]);
        \Brain\Monkey\Functions\when('status_header')->justReturn(null);

        Router::route();

        self::assertSame(84, $GLOBALS['wp_query']->constructor_args['page_id']);
    }

    public function test_route_does_not_install_query_when_url_to_postid_returns_zero(): void
    {
        \Brain\Monkey\Functions\expect('get_post')->never();
        \Brain\Monkey\Functions\when('is_admin')->justReturn(false);
        $_SERVER['REQUEST_URI'] = '/tyumen/unknown/';
        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);
        \Brain\Monkey\Functions\when('get_field')->alias(function ($name) {
            if ($name === 'main_town_slug') return 'spb';
            return false;
        });
        \Brain\Monkey\Functions\when('url_to_postid')->justReturn(0);

        Router::route();

        self::assertArrayNotHasKey('wp_query', $GLOBALS);
    }
}