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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license     https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Views\Helpers;

/**
 * @method \MvcCore\Ext\Views\Helpers\CssHelper GetInstance()
 */
class CssHelper extends Assets {

    protected static $instance = NULL;
    /**
     * Array with full class name and public method accepted as first param css code and returning minified code
     * @var callable
     */
    public static $MinifyCallable = ['\Minify_CSS', 'minify'];

    /**
     * Allowed media types for <link> tag
     * @var array
     */
    private static $_allowedMediaTypes = ['all','aural','braille','handheld','projection','print','screen','tty','tv',];

    /**
     * Array with all defined files to create specific link tags
     * @var $scriptsGroupContainer array
     */
    protected static $linksGroupContainer = [];

    /**
     * View Helper Method, returns current object instance.
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function Css ($groupName = self::GROUP_NAME_DEFAULT) {
        $this->actualGroupName = $groupName;
        $this->_getLinksGroupContainer($groupName);
        return $this;
    }

    /**
     * Check if style sheet is already presented in stylesheets group
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $doNotMinify
     * @return bool
     */
    public function Contains ($path = '', $media = 'all', $doNotMinify = FALSE) {
        $result = FALSE;
        $linksGroup = & $this->_getLinksGroupContainer($this->actualGroupName);
        foreach ($linksGroup as & $item) {
            if ($item->path == $path) {
                if ($item->media == $media && $item->doNotMinify == $doNotMinify) {
                    $result = TRUE;
                    break;
                }
            }
        }
        return $result;
    }

    /**
     * Remove style sheet if it is already presented in stylesheets group
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $doNotMinify
     * @return bool
     */
    public function Remove ($path = '', $media = 'all', $doNotMinify = FALSE) {
        $result = FALSE;
        $linksGroup = & $this->_getLinksGroupContainer($this->actualGroupName);
        foreach ($linksGroup as $index => & $item) {
            if ($item->path == $path) {
                if ($item->media == $media && $item->doNotMinify == $doNotMinify) {
                    $result = TRUE;
                    $ctrlActionKey = $this->getCtrlActionKey();
                    unset(self::$linksGroupContainer[$ctrlActionKey][$this->actualGroupName][$index]);
                    break;
                }
            }
        }
        return $result;
    }

    /**
     * Append style sheet after all group stylesheets for later render process with php tags executing in given file
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $doNotMinify
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function AppendRendered($path = '', $media = 'all', $doNotMinify = FALSE) {
        return $this->Append($path, $media, TRUE, $doNotMinify);
    }

    /**
     * Prepend style sheet before all group stylesheets for later render process with php tags executing in given file
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $renderPhpTags
     * @param  boolean $doNotMinify
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function PrependRendered($path = '', $media = 'all', $doNotMinify = FALSE) {
        return $this->Prepend($path, $media, TRUE, $doNotMinify);
    }

    /**
     * Add style sheet into given index of stylesheets group array for later render process with php tags executing in given file
     * @param  int   $index
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $renderPhpTags
     * @param  boolean $doNotMinify
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function OffsetSetRendered($index = 0, $path = '', $media = 'all', $doNotMinify = FALSE) {
        return $this->OffsetSet($index, $path, $media, TRUE, $doNotMinify);
    }

    /**
     * Append style sheet after all group stylesheets for later render process
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $renderPhpTags
     * @param  boolean $doNotMinify
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function Append($path = '', $media = 'all', $renderPhpTags = FALSE, $doNotMinify = FALSE) {
        $item = $this->_completeItem($path, $media, $renderPhpTags, $doNotMinify);
        $currentGroupRecords = & $this->_getLinksGroupContainer($this->actualGroupName);
        array_push($currentGroupRecords, $item);
        return $this;
    }

    /**
     * Prepend style sheet before all group stylesheets for later render process
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $renderPhpTags
     * @param  boolean $doNotMinify
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function Prepend($path = '', $media = 'all', $renderPhpTags = FALSE, $doNotMinify = FALSE) {
        $item = $this->_completeItem($path, $media, $renderPhpTags, $doNotMinify);
        $currentGroupRecords = & $this->_getLinksGroupContainer($this->actualGroupName);
        array_unshift($currentGroupRecords, $item);
        return $this;
    }

    /**
     * Add style sheet into given index of group stylesheets array for later render process
     * @param  int   $index
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $renderPhpTags
     * @param  boolean $doNotMinify
     * @return \MvcCore\Ext\Views\Helpers\CssHelper
     */
    public function OffsetSet ($index = 0, $path = '', $media = 'all', $renderPhpTags = FALSE, $doNotMinify = FALSE) {
        $item = $this->_completeItem($path, $media, $renderPhpTags, $doNotMinify);
        $currentGroupRecords = & $this->_getLinksGroupContainer($this->actualGroupName);
        $newItems = [];
        $added = FALSE;
        foreach ($currentGroupRecords as $key => $groupItem) {
            if ($key == $index) {
                $newItems[] = $item;
                $added = TRUE;
            }
            $newItems[] = $groupItem;
        }
        if (!$added) $newItems[] = $item;
        self::$linksGroupContainer[$this->getCtrlActionKey()][$this->actualGroupName] = $newItems;
        return $this;
    }

    /**
     * Create data item to store for render process
     * @param  string  $path
     * @param  string  $media
     * @param  boolean $render
     * @param  boolean $doNotMinify
     * @return \stdClass
     */
    private function _completeItem ($path, $media, $render, $doNotMinify) {
        if (self::$fileChecking) {
            if (!$path) $this->exception('Path to *.css can\'t be an empty string.');
            if (!in_array($media, self::$_allowedMediaTypes, TRUE)) $this->exception('Media could be only values: ' . implode(', ', self::$_allowedMediaTypes) . '.');
            $duplication = $this->_isDuplicateStylesheet($path);
            if ($duplication) $this->warning("Style sheet '$path' is already added in css group: '$duplication'.");
        }
        return (object) [
            'path'          => $path,
            'media'         => $media,
            'render'        => $render,
            'doNotMinify'   => $doNotMinify,
        ];
    }

    /**
     * Is the linked style sheet duplicate?
     * @param  string $path
     * @return string
     */
    private function _isDuplicateStylesheet ($path) {
        $result = '';
        $currentRecords = self::$linksGroupContainer[$this->getCtrlActionKey()];
        foreach ($currentRecords as $groupName => $groupItems) {
            foreach ($groupItems as $item) {
                if ($item->path == $path) {
                    $result = $groupName;
                    break;
                }
            }
        }
        return $result;
    }

    /**
     * Render link elements as html code with links to original files or temporary rendered files.
     * @param int $indent
     * @return string
     */
    public function Render ($indent = 0) {
        $currentGroupRecords = & $this->_getLinksGroupContainer($this->actualGroupName);
        if (count($currentGroupRecords) === 0) return '';
        $minify = (bool)self::$globalOptions['cssMinify'];
        $joinTogether = (bool)self::$globalOptions['cssJoin'];
        if ($joinTogether) {
            $result = $this->_renderItemsTogether(
                $this->actualGroupName,
                $currentGroupRecords,
                $indent,
                $minify
            );
        } else {
            $result = $this->_renderItemsSeparated(
                $this->actualGroupName,
                $currentGroupRecords,
                $indent,
                $minify
            );
        }
        return $result;
    }

    /**
     * Get actually dispatched controller/action group name.
     * @param string $name
     * @return array
     */
    private function & _getLinksGroupContainer ($name = '') {
        $ctrlActionKey = $this->getCtrlActionKey();
        if (!isset(self::$linksGroupContainer[$ctrlActionKey])) {
            self::$linksGroupContainer[$ctrlActionKey] = [];
        }
        if (!isset(self::$linksGroupContainer[$ctrlActionKey][$name])) {
            self::$linksGroupContainer[$ctrlActionKey][$name] = [];
        }
        return self::$linksGroupContainer[$ctrlActionKey][$name];
    }

    /**
     * Minify style sheet string and return minified result.
     * @param string $css
     * @param string $path
     * @return string
     */
    private function _minify (& $css, $path) {
        $result = '';
        $errorMsg = "Unable to minify style sheet ('{$path}').";
        if (!is_callable(static::$MinifyCallable)) {
            $this->exception(
                "Configured callable object for CSS minification doesn't exist. "
                .'Use: https://github.com/mrclay/minify -> /min/lib/Minify/CSS.php'
            );
        }
        try {
            $result = call_user_func(static::$MinifyCallable, $css);
        } catch (\Exception $e) { // backward compatibility
            $this->exception($errorMsg);
        } catch (\Throwable $e) {
            $this->exception($errorMsg);
        }
        return $result;
    }

    /**
     * Render data items as one <link> html tag or all another <link> html tags after with files which is not possible to minify.
     * @param string  $actualGroupName
     * @param array   $items
     * @param int    $indent
     * @param boolean $minify
     * @return string
     */
    private function _renderItemsTogether ($actualGroupName = '', $items = [], $indent = 0, $minify = FALSE) {
        // some configurations is not possible to render together and minimized
        list($itemsToRenderMinimized, $itemsToRenderSeparately) = $this->filterItemsForNotPossibleMinifiedAndPossibleMinifiedItems($items);

        $indentStr = $this->getIndentString($indent);
        $resultItems = [];
        if (self::$fileRendering) $resultItems[] = '<!-- css group begin: ' . $actualGroupName . ' -->';

        // process array with groups, which are not possible to minimize
        foreach ($itemsToRenderSeparately as & $itemsToRender) {
            $resultItems[] = $this->_renderItemsTogetherAsGroup($itemsToRender, $minify);
        }

        // process array with groups to minimize
        foreach ($itemsToRenderMinimized as & $itemsToRender) {
            $resultItems[] = $this->_renderItemsTogetherAsGroup($itemsToRender, $minify);
        }

        if (self::$fileRendering) $resultItems[] = '<!-- css group end: ' . $actualGroupName . ' -->';

        return $indentStr . implode(PHP_EOL . $indentStr, $resultItems);
    }

    /**
     * Render all items in group together, when application is compiled, do not check source files and changes.
     * @param array   $itemsToRender
     * @param boolean $minify
     * @return string
     */
    private function _renderItemsTogetherAsGroup ($itemsToRender = [], $minify = FALSE) {
        // complete tmp filename by source filenames and source files modification times
        $filesGroupInfo = [];
        foreach ($itemsToRender as $item) {
            if (self::$fileChecking) {
                $fullPath = $this->getAppRoot() . $item->path;
                if (!file_exists($fullPath)) {
                    $this->exception("File not found in CSS view rendering process ('$fullPath').");
                }
                $filesGroupInfo[] = $item->path . '?_' . self::getFileImprint($fullPath);
            } else {
                $filesGroupInfo[] = $item->path;
            }
        }
        $tmpFileFullPath = $this->getTmpFileFullPathByPartFilesInfo($filesGroupInfo, $minify, 'css');

        // check, if the rendered, together completed and minimized file is in tmp cache already
        if (self::$fileRendering) {
            if (!file_exists($tmpFileFullPath)) {
                // load all items and join them together
                $resultContent = '';
                foreach ($itemsToRender as & $item) {
                    $srcFileFullPath = $this->getAppRoot() . $item->path;
                    if ($item->render) {
                        $fileContent = $this->_renderFile($srcFileFullPath);
                    } else if ($minify) {
                        $fileContent = file_get_contents($srcFileFullPath);
                    }
                    $fileContent = $this->_convertStylesheetPathsFromRelatives2TmpAbsolutes(
                        $fileContent, $item->path
                    );
                    if ($minify) $fileContent = $this->_minify($fileContent, $item->path);
                    $resultContent .= PHP_EOL . "/* " . $item->path . " */" . PHP_EOL . $fileContent . PHP_EOL;
                }
                // save completed tmp file
                $this->saveFileContent($tmpFileFullPath, $resultContent);
                $this->log("Css files group rendered ('$tmpFileFullPath').", 'debug');
            }
        }

        // complete <link> tag with tmp file path in $tmpFileFullPath variable
        $firstItem = array_merge((array) $itemsToRender[0], []);
        $pathToTmp = substr($tmpFileFullPath, strlen($this->getAppRoot()));
        $firstItem['href'] = $this->CssJsFileUrl($pathToTmp);
        return $this->_renderItemSeparated((object) $firstItem);
    }

    /**
     * Render css file by absolute path as php file and return rendered result as string
     * @param string $absolutePath
     * @return string
     */
    private function _renderFile ($absolutePath) {
        ob_start();
        try {
            include($absolutePath);
        } catch (\Exception $e) { // backward compatibility
            $this->exceptionHandler($e);
        } catch (\Throwable $e) {
            $this->exceptionHandler($e);
        }
        return ob_get_clean();
    }

    /**
     * Converts all relative paths in all css rules to absolute paths with \MvcCore Url structures
     * @param mixed $fullPathContent css file full path
     * @param mixed $href css file href value
     * @return string
     *
     */
    private function _convertStylesheetPathsFromRelatives2TmpAbsolutes (& $fullPathContent, $href) {
        $lastHrefSlashPos = mb_strrpos($href, '/');
        if ($lastHrefSlashPos === FALSE) return $fullPathContent;
        $stylesheetDirectoryRelative = mb_substr($href, 0, $lastHrefSlashPos + 1);

        // process content for all double dots
        $position = 0;
        while ($position < mb_strlen($fullPathContent)) {
            $doubleDotsPos = mb_strpos($fullPathContent, '../', $position);
            if ($doubleDotsPos === FALSE) break;

            // make sure that double dot string is in `url('')` or `url("")` block

            // try to find first occurrence of `url("` backwards
            $lastUrlBeginStrPos = mb_strrpos(mb_substr($fullPathContent, 0, $doubleDotsPos), 'url(');
            if ($lastUrlBeginStrPos === FALSE) {
                $position = $doubleDotsPos + 3;
                continue;
            }

            // then check if between that are only [\./ ]
            $beginOfUrlBlockChars = mb_substr($fullPathContent, $lastUrlBeginStrPos + 4, $doubleDotsPos - ($lastUrlBeginStrPos + 4));
            $beginOfUrlBlockChars = preg_replace("#[\./ \"'_\-]#", "", $beginOfUrlBlockChars);
            if (mb_strlen($beginOfUrlBlockChars) > 0) {
                $position = $lastUrlBeginStrPos + 4;
                continue;
            }

            // try to find first occurrence of `")`
            $firstUrlEndStrPos = mb_strpos($fullPathContent, ')', $doubleDotsPos);
            if ($firstUrlEndStrPos === FALSE) {
                $position = $doubleDotsPos + 3;
                continue;
            }

            // then check of between that are only [a-zA-Z\./ ]
            $endOfUrlBlockChars = mb_substr($fullPathContent, $doubleDotsPos + 3, $firstUrlEndStrPos - ($doubleDotsPos + 3));
            $endOfUrlBlockChars = preg_replace("#[a-zA-Z\./ \"'_\-\?\&\#]#", "", $endOfUrlBlockChars);
            if (mb_strlen($endOfUrlBlockChars) > 0) {
                $position = $firstUrlEndStrPos + 1;
                continue;
            }

            // if it is not the Url block, shift the position and continue

            // replace relative path to absolute path
            $lastUrlBeginStrPos += 4;
            $urlSubStr = mb_substr($fullPathContent, $lastUrlBeginStrPos, $firstUrlEndStrPos - $lastUrlBeginStrPos);

            // get double or single quotes or no quotes
            $firstStr = mb_substr($urlSubStr, 0, 1);
            $lastStr = mb_substr($urlSubStr, mb_strlen($urlSubStr) - 1, 1);
            if ($firstStr === '"' && $lastStr === '"') {
                $urlSubStr = mb_substr($urlSubStr, 1, mb_strlen($urlSubStr) - 2);
                $quote = '"';
            } else if ($firstStr === "'" && $lastStr === "'") {
                $urlSubStr = mb_substr($urlSubStr, 1, mb_strlen($urlSubStr) - 2);
                $quote = "'";
            } else {
                $quote = '"';
            }

            // translate relative to web absolute path
            $trimmedUrlSubStr = ltrim($urlSubStr, './');
            $trimmedPartLength = mb_strlen($urlSubStr) - mb_strlen($trimmedUrlSubStr);
            $trimmedPart = trim(mb_substr($urlSubStr, 0, $trimmedPartLength), '/');
            $subjectRestPath = trim(mb_substr($urlSubStr, $trimmedPartLength), '/');

            $urlFullBasePath = str_replace('\\', '/', realpath($this->getAppRoot() . $stylesheetDirectoryRelative . $trimmedPart));
            $urlFullPath = $urlFullBasePath . '/' . $subjectRestPath;

            // complete style sheet new path
            $webPath = mb_substr($urlFullPath, mb_strlen($this->getAppRoot()));
            $webPath = $this->CssJsFileUrl($webPath);

            // replace the URL part
            $fullPathContent = mb_substr($fullPathContent, 0, $lastUrlBeginStrPos)
                . $quote . $webPath . $quote
                . mb_substr($fullPathContent, $firstUrlEndStrPos);

            // shift the position property
            $position = $lastUrlBeginStrPos + mb_strlen($webPath) + 3;
        }

        return str_replace('__RELATIVE_BASE_PATH__', '../..', $fullPathContent);
    }

    /**
     * Render css file by path as php file and store result in tmp directory and return new href value
     * @param \stdClass $item
     * @param boolean  $minify
     * @return string
     */
    private function _renderFileToTmpAndGetNewHref ($item, $minify = FALSE) {
        $path = $item->path;
        $tmpFileName = '/rendered_css_' . self::$systemConfigHash . '_' . trim(str_replace('/', '_', $path), "_");
        $srcFileFullPath = $this->getAppRoot() . $path;
        $tmpFileFullPath = $this->getTmpDir() . $tmpFileName;
        if (self::$fileRendering) {
            if (file_exists($srcFileFullPath)) {
                $srcFileModDate = filemtime($srcFileFullPath);
            } else {
                $srcFileModDate = 1;
            }
            if (file_exists($tmpFileFullPath)) {
                $tmpFileModDate = filemtime($tmpFileFullPath);
            } else {
                $tmpFileModDate = 0;
            }
            if ($srcFileModDate !== FALSE && $tmpFileModDate !== FALSE) {
                if ($srcFileModDate > $tmpFileModDate) {
                    if ($item->render) {
                        $fileContent = $this->_renderFile($srcFileFullPath);
                    } else if ($minify) {
                        $fileContent = file_get_contents($srcFileFullPath);
                    }
                    $fileContent = $this->_convertStylesheetPathsFromRelatives2TmpAbsolutes($fileContent, $path);
                    if ($minify) $fileContent = $this->_minify($fileContent, $item->path);
                    $this->saveFileContent($tmpFileFullPath, $fileContent);
                    $this->log("Css file rendered ('$tmpFileFullPath').", 'debug');
                }
            }
        }
        $tmpPath = substr($tmpFileFullPath, strlen($this->getAppRoot()));
        return $tmpPath;
    }

    /**
     * Create HTML link element from data item
     * @param  \stdClass $item
     * @return string
     */
    private function _renderItemSeparated (\stdClass $item) {
        $result = '<link rel="stylesheet"';
        if ($item->media !== 'all') $result .= ' media="' . $item->media . '"';
        if (!$item->render && self::$fileChecking) {
            $fullPath = $this->getAppRoot() . $item->path;
            if (!file_exists($fullPath)) {
                $this->log("File not found in CSS view rendering process ('$fullPath').", 'error');
            }
        }
        $result .= ' href="' . $item->href . '" />';
        return $result;
    }

    /**
     * Render data items as separated <link> html tags
     * @param string  $actualGroupName
     * @param array   $items
     * @param int     $indent
     * @param boolean $minify
     * @return string
     */
    private function _renderItemsSeparated ($actualGroupName = '', $items = [], $indent = 0, $minify = FALSE) {
        $indentStr = $this->getIndentString($indent);
        $resultItems = [];
        if (self::$fileRendering) $resultItems[] = '<!-- css group begin: ' . $actualGroupName . ' -->';
        $appCompilation = \MvcCore\Application::GetInstance()->GetCompiled();
        foreach ($items as $item) {
            if ($item->render || ($minify && !$item->doNotMinify)) {
                $item->href = $this->CssJsFileUrl($this->_renderFileToTmpAndGetNewHref($item, $minify));
            } else {
                $item->href = $this->CssJsFileUrl($item->path);
            }
            if (!$appCompilation) {
                $item->href = $this->addFileModificationImprintToHrefUrl($item->href, $item->path);
            }
            $resultItems[] = $this->_renderItemSeparated($item);
        }
        if (self::$fileRendering) $resultItems[] = '<!-- css group end: ' . $actualGroupName . ' -->';
        return $indentStr . implode(PHP_EOL . $indentStr, $resultItems);
    }
}