<?php

declare(strict_types=1);

namespace WPBootstrap\Tests\Unit\Template;

use PHPUnit\Framework\TestCase;
use Brain\Monkey;
use Brain\Monkey\Functions;
use WPBootstrap\Template\NavWalker;

class NavWalkerTest extends TestCase
{
    private NavWalker $walker;

    protected function setUp(): void
    {
        parent::setUp();
        Monkey\setUp();

        // Default: no page or category is active.
        Functions\when('is_page')->justReturn(false);
        Functions\when('is_category')->justReturn(false);

        $this->walker = new NavWalker();
    }

    protected function tearDown(): void
    {
        Monkey\tearDown();
        parent::tearDown();
    }

    // ── Tree structure ──────────────────────────────────────────

    public function testBuildTreeWithEmptyArray(): void
    {
        $this->assertSame([], $this->walker->buildTree([]));
    }

    public function testBuildTreeWithSingleItem(): void
    {
        $items = [$this->makeItem(10, 'Home', '/')];
        $tree  = $this->walker->buildTree($items);

        $this->assertCount(1, $tree);
        $this->assertSame('Home', $tree[0]['title']);
        $this->assertSame('/', $tree[0]['url']);
    }

    public function testBuildTreeFlatItemsAllTopLevel(): void
    {
        $items = [
            $this->makeItem(1, 'A', '/a'),
            $this->makeItem(2, 'B', '/b'),
            $this->makeItem(3, 'C', '/c'),
        ];

        $tree = $this->walker->buildTree($items);

        $this->assertCount(3, $tree);
        foreach ($tree as $node) {
            $this->assertEmpty($node['children']);
        }
    }

    public function testBuildTreeWithChildren(): void
    {
        $items = [
            $this->makeItem(10, 'Home', '/'),
            $this->makeItem(20, 'About', '/about'),
            $this->makeItem(30, 'Team', '/about/team', parent: 20),
            $this->makeItem(40, 'Jobs', '/about/jobs', parent: 20),
        ];

        $tree = $this->walker->buildTree($items);

        $this->assertCount(2, $tree);
        $this->assertSame('About', $tree[1]['title']);
        $this->assertCount(2, $tree[1]['children']);
        $this->assertSame('Team', $tree[1]['children'][0]['title']);
        $this->assertSame('Jobs', $tree[1]['children'][1]['title']);
    }

    public function testBuildTreeWithMultipleParents(): void
    {
        $items = [
            $this->makeItem(1, 'A', '/a'),
            $this->makeItem(2, 'B', '/b'),
            $this->makeItem(3, 'A1', '/a/1', parent: 1),
            $this->makeItem(4, 'B1', '/b/1', parent: 2),
        ];

        $tree = $this->walker->buildTree($items);

        $this->assertCount(2, $tree);
        $this->assertCount(1, $tree[0]['children']);
        $this->assertCount(1, $tree[1]['children']);
        $this->assertSame('A1', $tree[0]['children'][0]['title']);
        $this->assertSame('B1', $tree[1]['children'][0]['title']);
    }

    public function testBuildTreeOrphansAreDropped(): void
    {
        $items = [
            $this->makeItem(1, 'Root', '/'),
            $this->makeItem(2, 'Orphan', '/orphan', parent: 999),
        ];

        $tree = $this->walker->buildTree($items);

        $this->assertCount(1, $tree);
        $this->assertSame('Root', $tree[0]['title']);
    }

    public function testBuildTreeNodeStructure(): void
    {
        $items = [$this->makeItem(42, 'Page', '/page', target: '_blank', classes: ['menu-item', 'custom'])];
        $tree  = $this->walker->buildTree($items);

        $node = $tree[0];
        $this->assertSame(42, $node['id']);
        $this->assertSame('Page', $node['title']);
        $this->assertSame('/page', $node['url']);
        $this->assertSame('_blank', $node['target']);
        $this->assertSame('menu-item custom', $node['classes']);
        $this->assertIsBool($node['active']);
        $this->assertIsArray($node['children']);
    }

    public function testBuildTreeClassesJoined(): void
    {
        $items = [$this->makeItem(1, 'X', '/x', classes: ['nav-item', '', 'menu-item'])];
        $tree  = $this->walker->buildTree($items);

        // Empty strings are filtered out by array_filter.
        $this->assertSame('nav-item menu-item', $tree[0]['classes']);
    }

    public function testBuildTreeIndexIsReset(): void
    {
        $items = [
            $this->makeItem(50, 'A', '/a'),
            $this->makeItem(100, 'B', '/b'),
        ];

        $tree = $this->walker->buildTree($items);

        // array_values resets keys to 0-indexed.
        $this->assertArrayHasKey(0, $tree);
        $this->assertArrayHasKey(1, $tree);
        $this->assertArrayNotHasKey(50, $tree);
    }

    // ── Active detection ────────────────────────────────────────

    public function testBuildTreeSetsActiveViaCurrentMenuItem(): void
    {
        $items = [$this->makeItem(1, 'Active', '/active', classes: ['current-menu-item'])];
        $tree  = $this->walker->buildTree($items);

        $this->assertTrue($tree[0]['active']);
    }

    public function testBuildTreeSetsActiveViaAncestor(): void
    {
        $items = [$this->makeItem(1, 'Parent', '/parent', classes: ['current-menu-ancestor'])];
        $tree  = $this->walker->buildTree($items);

        $this->assertTrue($tree[0]['active']);
    }

    public function testBuildTreeSetsActiveViaIsPage(): void
    {
        Functions\when('is_page')->alias(fn(int $id): bool => $id === 42);

        $items = [$this->makeItem(1, 'Contact', '/contact', object: 'page', objectId: 42)];
        $tree  = $this->walker->buildTree($items);

        $this->assertTrue($tree[0]['active']);
    }

    public function testBuildTreeSetsActiveViaIsCategory(): void
    {
        Functions\when('is_category')->alias(fn(int $id): bool => $id === 7);

        $items = [$this->makeItem(1, 'News', '/news', object: 'category', objectId: 7)];
        $tree  = $this->walker->buildTree($items);

        $this->assertTrue($tree[0]['active']);
    }

    public function testBuildTreeNotActive(): void
    {
        $items = [$this->makeItem(1, 'Inactive', '/inactive')];
        $tree  = $this->walker->buildTree($items);

        $this->assertFalse($tree[0]['active']);
    }

    // ── Helper ──────────────────────────────────────────────────

    private function makeItem(
        int $id,
        string $title,
        string $url,
        int $parent = 0,
        string $target = '',
        array $classes = [],
        string $object = 'page',
        int $objectId = 0,
    ): object {
        return (object) [
            'ID'               => $id,
            'title'            => $title,
            'url'              => $url,
            'target'           => $target,
            'classes'          => $classes,
            'menu_item_parent' => $parent,
            'object'           => $object,
            'object_id'        => $objectId ?: $id,
        ];
    }
}