<?php

namespace SilverStripe\Core\Tests\Manifest;

use Psr\SimpleCache\CacheInterface;
use SilverStripe\Control\Director;
use SilverStripe\Core\Manifest\ModuleLoader;
use SilverStripe\View\ThemeResourceLoader;
use SilverStripe\View\ThemeManifest;
use SilverStripe\Dev\SapphireTest;
use SilverStripe\Core\Manifest\ModuleManifest;

/**
 * Tests for the {@link TemplateLoader} class.
 */
class ThemeResourceLoaderTest extends SapphireTest
{
    /**
     * @var string
     */
    private $base;

    /**
     * @var ThemeManifest
     */
    private $manifest;

    /**
     * @var ThemeResourceLoader
     */
    private $loader;

    /**
     * Set up manifest before each test
     */
    protected function setUp()
    {
        parent::setUp();

        // Fake project root
        $this->base = dirname(__FILE__) . '/fixtures/templatemanifest';
        Director::config()->set('alternate_base_folder', $this->base);
        ModuleManifest::config()->set('module_priority', ['$project', '$other_modules']);
        ModuleManifest::config()->set('project', 'myproject');

        $moduleManifest = new ModuleManifest($this->base);
        $moduleManifest->init();
        $moduleManifest->sort();
        ModuleLoader::inst()->pushManifest($moduleManifest);

        // New ThemeManifest for that root
        $this->manifest = new ThemeManifest($this->base);
        $this->manifest->setProject('myproject');
        $this->manifest->init();
        // New Loader for that root
        $this->loader = new ThemeResourceLoader($this->base);
        $this->loader->addSet('$default', $this->manifest);

        // Ensure the cache is flushed between tests
        ThemeResourceLoader::flush();
    }

    protected function tearDown()
    {
        ModuleLoader::inst()->popManifest();
        parent::tearDown();
    }

    /**
     * Test that 'main' and 'Layout' templates are loaded from module
     */
    public function testFindTemplatesInModule()
    {
        $this->assertEquals(
            "$this->base/module/templates/Page.ss",
            $this->loader->findTemplate('Page', ['$default'])
        );

        $this->assertEquals(
            "$this->base/module/templates/Layout/Page.ss",
            $this->loader->findTemplate(['type' => 'Layout', 'Page'], ['$default'])
        );
    }

    public function testFindNestedThemeTemplates()
    {
        // Without including the theme this template cannot be found
        $this->assertEquals(null, $this->loader->findTemplate('NestedThemePage', ['$default']));

        // With a nested theme available then it is available
        $this->assertEquals(
            "{$this->base}/module/themes/subtheme/templates/NestedThemePage.ss",
            $this->loader->findTemplate(
                'NestedThemePage',
                [
                    'silverstripe/module:subtheme',
                    '$default'
                ]
            )
        );

        // Can also be found if excluding $default theme
        $this->assertEquals(
            "{$this->base}/module/themes/subtheme/templates/NestedThemePage.ss",
            $this->loader->findTemplate(
                'NestedThemePage',
                [
                    'silverstripe/module:subtheme',
                ]
            )
        );
    }

    public function testFindTemplateByType()
    {
        // Test that "type" is respected properly
        $this->assertEquals(
            "{$this->base}/module/templates/MyNamespace/Layout/MyClass.ss",
            $this->loader->findTemplate(
                [
                    [
                        'type' => 'Layout',
                        'MyNamespace/NonExistantTemplate'
                    ],
                    [
                        'type' => 'Layout',
                        'MyNamespace/MyClass'
                    ],
                    'MyNamespace/MyClass'
                ],
                [
                    'silverstripe/module:subtheme',
                    'theme',
                    '$default',
                ]
            )
        );

        // Non-typed template can be found even if looking for typed theme at a lower priority
        $this->assertEquals(
            "{$this->base}/module/templates/MyNamespace/MyClass.ss",
            $this->loader->findTemplate(
                [
                    [
                        'type' => 'Layout',
                        'MyNamespace/NonExistantTemplate'
                    ],
                    'MyNamespace/MyClass',
                    [
                        'type' => 'Layout',
                        'MyNamespace/MyClass'
                    ]
                ],
                [
                    'silverstripe/module',
                    'theme',
                    '$default',
                ]
            )
        );
    }

    public function testFindTemplatesByPath()
    {
        // Items given as full paths are returned directly
        $this->assertEquals(
            "$this->base/themes/theme/templates/Page.ss",
            $this->loader->findTemplate("$this->base/themes/theme/templates/Page.ss", ['theme'])
        );

        $this->assertEquals(
            "$this->base/themes/theme/templates/Page.ss",
            $this->loader->findTemplate(
                [
                    "$this->base/themes/theme/templates/Page.ss",
                    "Page"
                ],
                ['theme']
            )
        );

        // Ensure checks for file_exists
        $this->assertEquals(
            "$this->base/themes/theme/templates/Page.ss",
            $this->loader->findTemplate(
                [
                    "$this->base/themes/theme/templates/NotAPage.ss",
                    "$this->base/themes/theme/templates/Page.ss",
                ],
                ['theme']
            )
        );
    }

    /**
     * Test that 'main' and 'Layout' templates are loaded from set theme
     */
    public function testFindTemplatesInTheme()
    {
        $this->assertEquals(
            "$this->base/themes/theme/templates/Page.ss",
            $this->loader->findTemplate('Page', ['theme'])
        );

        $this->assertEquals(
            "$this->base/themes/theme/templates/Layout/Page.ss",
            $this->loader->findTemplate(['type' => 'Layout', 'Page'], ['theme'])
        );
    }

    /**
     * Test that 'main' and 'Layout' templates are loaded from project without a set theme
     */
    public function testFindTemplatesInApplication()
    {
        // TODO: replace with one that doesn't create temporary files (so bad)
        $templates = array(
            $this->base . '/myproject/templates/Page.ss',
            $this->base . '/myproject/templates/Layout/Page.ss'
        );
        $this->createTestTemplates($templates);

        $this->assertEquals(
            "$this->base/myproject/templates/Page.ss",
            $this->loader->findTemplate('Page', ['$default'])
        );

        $this->assertEquals(
            "$this->base/myproject/templates/Layout/Page.ss",
            $this->loader->findTemplate(['type' => 'Layout', 'Page'], ['$default'])
        );

        $this->removeTestTemplates($templates);
    }

    /**
     * Test that 'main' template is found in theme and 'Layout' is found in module
     */
    public function testFindTemplatesMainThemeLayoutModule()
    {
        $this->assertEquals(
            "$this->base/themes/theme/templates/CustomThemePage.ss",
            $this->loader->findTemplate('CustomThemePage', ['theme', '$default'])
        );

        $this->assertEquals(
            "$this->base/module/templates/Layout/CustomThemePage.ss",
            $this->loader->findTemplate(['type' => 'Layout', 'CustomThemePage'], ['theme', '$default'])
        );
    }

    public function testFindThemedCSS()
    {
        $this->assertEquals(
            "myproject/css/project.css",
            $this->loader->findThemedCSS('project', ['$default', 'theme'])
        );
        $this->assertEquals(
            "themes/theme/css/project.css",
            $this->loader->findThemedCSS('project', ['theme', '$default'])
        );
        $this->assertEmpty(
            $this->loader->findThemedCSS('nofile', ['theme', '$default'])
        );
        $this->assertEquals(
            'module/css/content.css',
            $this->loader->findThemedCSS('content', ['/module', 'theme'])
        );
        $this->assertEquals(
            'module/css/content.css',
            $this->loader->findThemedCSS('content', ['/module', 'theme', '$default'])
        );
        $this->assertEquals(
            'module/css/content.css',
            $this->loader->findThemedCSS('content', ['$default', '/module', 'theme'])
        );
    }

    public function testFindThemedJavascript()
    {
        $this->assertEquals(
            "myproject/javascript/project.js",
            $this->loader->findThemedJavascript('project', ['$default', 'theme'])
        );
        $this->assertEquals(
            "themes/theme/javascript/project.js",
            $this->loader->findThemedJavascript('project', ['theme', '$default'])
        );
        $this->assertEmpty(
            $this->loader->findThemedJavascript('nofile', ['theme', '$default'])
        );
        $this->assertEquals(
            'module/javascript/content.js',
            $this->loader->findThemedJavascript('content', ['/module', 'theme'])
        );
        $this->assertEquals(
            'module/javascript/content.js',
            $this->loader->findThemedJavascript('content', ['/module', 'theme', '$default'])
        );
        $this->assertEquals(
            'module/javascript/content.js',
            $this->loader->findThemedJavascript('content', ['$default', '/module', 'theme'])
        );
    }

    protected function createTestTemplates($templates)
    {
        foreach ($templates as $template) {
            file_put_contents($template, '');
        }
    }

    protected function removeTestTemplates($templates)
    {
        foreach ($templates as $template) {
            unlink($template);
        }
    }

    public function providerTestGetPath()
    {
        return [
            // Legacy theme
            [
                'theme',
                'themes/theme',
            ],
            // Module themes
            [
                'silverstripe/vendormodule:vendortheme',
                'vendor/silverstripe/vendormodule/themes/vendortheme',
            ],
            [
                'module:subtheme',
                'module/themes/subtheme',
            ],
            // Module absolute paths
            [
                'silverstripe/vendormodule:/themes/vendortheme',
                'vendor/silverstripe/vendormodule/themes/vendortheme',
            ],
            [
                'module:/themes/subtheme',
                'module/themes/subtheme',
            ],
            // Module root directory
            [
                'silverstripe/vendormodule:/',
                'vendor/silverstripe/vendormodule',
            ],
            [
                'silverstripe/vendormodule:',
                'vendor/silverstripe/vendormodule',
            ],
            [
                'silverstripe/vendormodule',
                'vendor/silverstripe/vendormodule',
            ],
            [
                'module:',
                'module',
            ],
            // Absolute paths
            [
                '/vendor/silverstripe/vendormodule/themes/vendortheme',
                'vendor/silverstripe/vendormodule/themes/vendortheme',
            ],
            [
                '/module/themes/subtheme',
                'module/themes/subtheme'
            ]
        ];
    }

    /**
     * @dataProvider providerTestGetPath
     * @param string $name Theme identifier
     * @param string $path Path to theme
     */
    public function testGetPath($name, $path)
    {
        $this->assertEquals($path, $this->loader->getPath($name));
    }

    public function testFindTemplateWithCacheMiss()
    {
        $mockCache = $this->createMock(CacheInterface::class);
        $mockCache->expects($this->once())->method('has')->willReturn(false);
        $mockCache->expects($this->never())->method('get');
        $mockCache->expects($this->once())->method('set');

        $loader = new ThemeResourceLoader();
        $loader->setCache($mockCache);
        $loader->findTemplate('Page', ['$default']);
    }

    public function testFindTemplateWithCacheHit()
    {
        $mockCache = $this->createMock(CacheInterface::class);
        $mockCache->expects($this->once())->method('has')->willReturn(true);
        $mockCache->expects($this->never())->method('set');
        $mockCache->expects($this->once())->method('get')->willReturn('mock_template.ss');

        $loader = new ThemeResourceLoader();
        $loader->setCache($mockCache);
        $this->assertSame('mock_template.ss', $loader->findTemplate('Page', ['$default']));
    }
}