/**
 * @fileoverview Theme Service for Rantii
 * @author retoor <retoor@molodetz.nl>
 * @description Manages application themes and visual appearance
 * @keywords theme, dark mode, light mode, appearance, styling
 */

const THEMES = {
    dark: {
        name: 'Dark',
        class: 'theme-dark'
    },
    light: {
        name: 'Light',
        class: 'theme-light'
    },
    black: {
        name: 'Black',
        class: 'theme-black'
    },
    white: {
        name: 'White',
        class: 'theme-white'
    },
    ocean: {
        name: 'Ocean',
        class: 'theme-ocean'
    },
    forest: {
        name: 'Forest',
        class: 'theme-forest'
    },
    sunset: {
        name: 'Sunset',
        class: 'theme-sunset'
    }
};

class ThemeService {
    constructor(storageService) {
        this.storage = storageService;
        this.currentTheme = 'dark';
        this.onThemeChange = null;
    }

    init() {
        const savedTheme = this.storage.getTheme();
        if (savedTheme && THEMES[savedTheme]) {
            this.applyTheme(savedTheme);
        } else {
            this.applyTheme(this.detectPreferredTheme());
        }
        this.listenToSystemPreference();
    }

    detectPreferredTheme() {
        if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
            return 'dark';
        }
        return 'light';
    }

    listenToSystemPreference() {
        if (window.matchMedia) {
            window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', (e) => {
                if (!this.storage.has('theme')) {
                    this.applyTheme(e.matches ? 'dark' : 'light');
                }
            });
        }
    }

    applyTheme(themeName) {
        const theme = THEMES[themeName];
        if (!theme) {
            return false;
        }

        Object.values(THEMES).forEach(t => {
            document.documentElement.classList.remove(t.class);
            document.body.classList.remove(t.class);
        });

        document.documentElement.classList.add(theme.class);
        document.body.classList.add(theme.class);
        this.currentTheme = themeName;
        this.storage.setTheme(themeName);

        const metaThemeColor = document.querySelector('meta[name="theme-color"]');
        if (metaThemeColor) {
            const colors = {
                dark: '#1a1a2e',
                light: '#f5f5f7',
                black: '#000000',
                white: '#ffffff',
                ocean: '#0a1929',
                forest: '#0d1f0d',
                sunset: '#1f1410'
            };
            metaThemeColor.setAttribute('content', colors[themeName] || '#1a1a2e');
        }

        if (this.onThemeChange) {
            this.onThemeChange(themeName, theme);
        }

        window.dispatchEvent(new CustomEvent('rantii:theme-change', {
            detail: { theme: themeName, themeData: theme }
        }));

        return true;
    }

    setTheme(themeName) {
        return this.applyTheme(themeName);
    }

    getTheme() {
        return this.currentTheme;
    }

    getThemeData() {
        return THEMES[this.currentTheme];
    }

    getAvailableThemes() {
        return Object.entries(THEMES).map(([key, value]) => ({
            id: key,
            name: value.name
        }));
    }

    toggle() {
        const currentIndex = Object.keys(THEMES).indexOf(this.currentTheme);
        const nextIndex = (currentIndex + 1) % Object.keys(THEMES).length;
        const nextTheme = Object.keys(THEMES)[nextIndex];
        return this.applyTheme(nextTheme);
    }

    toggleDarkLight() {
        if (this.currentTheme === 'dark' || this.currentTheme === 'black') {
            return this.applyTheme('light');
        }
        return this.applyTheme('dark');
    }

    setThemeChangeCallback(callback) {
        this.onThemeChange = callback;
    }

    isDark() {
        return ['dark', 'black', 'ocean', 'forest', 'sunset'].includes(this.currentTheme);
    }
}

export { ThemeService, THEMES };