<?php
class ThemeHelper {
    /**
     * @todo instead of hardcoding the themes, we should get them from the themes directory and extract the text and background colors from the css file
     * Ideally we don't need to be hardcoding any values here, but it's a quick fix to get the themes working with the current codebase
     */
    private const THEME_BLACK = 'black';
    private const THEME_WHITE = 'white';
    private const THEME_GRAY = 'gray';
    private const THEME_AZURE = 'azure';
    private const COLOR_BLACK = '#1c1c1c';
    private const COLOR_WHITE = '#f2f2f2';

    private const TOP_NAV_THEMES = [self::THEME_BLACK, self::THEME_WHITE];
    private const SIDEBAR_THEMES = [self::THEME_GRAY, self::THEME_AZURE];

    private const DARK_THEMES = [self::THEME_BLACK, self::THEME_GRAY];
    private const LIGHT_THEMES = [self::THEME_WHITE, self::THEME_AZURE];

    private const FGCOLORS = [
        self::THEME_BLACK => self::COLOR_BLACK,
        self::THEME_WHITE => self::COLOR_BLACK,
        self::THEME_GRAY => self::COLOR_WHITE,
        self::THEME_AZURE => self::COLOR_WHITE
    ];

    private const INIT_ERROR = 'ThemeHelper not initialized. Call initWithCurrentThemeSetting() first.';

    private string $themeName;
    private bool $topNavTheme;
    private bool $sidebarTheme;
    private bool $darkTheme;
    private bool $lightTheme;
    private string $themeHtmlClass;
    private string $fgcolor;

    /**
     * Constructor for ThemeHelper
     * 
     * @param string|null $theme The theme name (optional)
     */
    public function __construct(?string $theme = null) {
        if ($theme === null) {
            throw new \RuntimeException(self::INIT_ERROR);
        }
        $this->initWithCurrentThemeSetting($theme);
    }

    /**
     * Initialize theme properties
     * 
     * @param string $theme The theme name
     * @return void
     */
    public function initWithCurrentThemeSetting(string $theme): void {
        $this->themeName = strtok($theme, '-');

        $this->topNavTheme = in_array($this->themeName, self::TOP_NAV_THEMES);
        $this->sidebarTheme = in_array($this->themeName, self::SIDEBAR_THEMES);
        $this->darkTheme = in_array($this->themeName, self::DARK_THEMES);
        $this->lightTheme = in_array($this->themeName, self::LIGHT_THEMES);

        $this->themeHtmlClass = "Theme--{$this->themeName}";
        if ($this->sidebarTheme) {
            $this->themeHtmlClass .= " Theme--sidebar";
        }

        $this->fgcolor = self::FGCOLORS[$this->themeName] ?? self::COLOR_BLACK;
    }

    public function getThemeName(): string {
        return $this->themeName;
    }

    public function isTopNavTheme(): bool {
        return $this->topNavTheme;
    }

    public function isSidebarTheme(): bool {
        return $this->sidebarTheme;
    }

    public function isDarkTheme(): bool {
        return $this->darkTheme;
    }

    public function isLightTheme(): bool {
        return $this->lightTheme;
    }

    public function getThemeHtmlClass(): string {
        return $this->themeHtmlClass;
    }

    public function getFgColor(): string {
        return $this->fgcolor;
    }

    public function updateDockerLogColor(string $docroot): void {
        exec("sed -ri 's/^\.logLine\{color:#......;/.logLine{color:{$this->fgcolor};/' $docroot/plugins/dynamix.docker.manager/log.htm >/dev/null &");
    }

    /**
     * Get all available theme names from the themes directory
     * 
     * @param string $docroot The document root path
     * @return array Array of theme names
     */
    public static function getThemesFromFileSystem(string $docroot): array {
        $themes = [];
        $themeFiles = glob("$docroot/webGui/styles/themes/*.css");

        foreach ($themeFiles as $themeFile) {
            $themeName = basename($themeFile, '.css');
            $themes[] = $themeName;
        }

        return $themes;
    }
}