// =====================================================================
// Theme configuration and dark/light toggle for Shaarli Pro.
// Keeps theme/mode preferences client-side without creating bookmarks.
// Used by the dark/light switch AND the theme picker (tools.html).
// =====================================================================
(function () {
    'use strict';

    const STORAGE_KEY = 'shaarit_themes_config';

    function readConfig() {
        try {
            const raw = localStorage.getItem(STORAGE_KEY);
            if (!raw) return null;
            const parsed = JSON.parse(raw);
            return (parsed && typeof parsed === 'object') ? parsed : null;
        } catch (e) {
            return null;
        }
    }

    function writeConfig(config) {
        try {
            localStorage.setItem(STORAGE_KEY, JSON.stringify(config));
            return true;
        } catch (e) {
            return false;
        }
    }

    // Merge partial updates into the persisted config and save to localStorage.
    function save(partial) {
        const base = readConfig() || {};
        const config = Object.assign(
            { version: 2, themes: [], default: 'DEFAULT', mode: 'dark' },
            base,
            partial || {}
        );
        const ok = writeConfig(config);
        return Promise.resolve({ ok, config });
    }

    // Reads the current persisted config from localStorage (no write).
    function load() {
        return Promise.resolve(readConfig());
    }

    // Kept for backward compatibility with older callers.
    function findCandidates() {
        return Promise.resolve([]);
    }

    window.ShaaritThemeConfig = { save, load, findCandidates };
})();

document.addEventListener('DOMContentLoaded', () => {
    'use strict';

    const themeCheckbox = document.getElementById('theme-toggle-checkbox');
    const themeIconLight = document.getElementById('theme-icon-light');
    const themeLabelSpan = document.querySelector('.theme-toggle-label span');
    const i18n = window.ShaarliProI18n || { t: function (k) { return k; } };

    function checkThemeRestrictions() {
        const themeId = localStorage.getItem('shaarit_theme_id') || 'DEFAULT';
        const darkOnlyThemes = ['LINEAR', 'SPOTIFY', 'NOTION', 'DISCORD', 'DRACULA', 'ONE_DARK_PRO', 'TOKYO_NIGHT', 'NORD', 'NIGHT_OWL', 'ANTHRACITE', 'CYBERPUNK', 'NAVY_ELEGANCE', 'EARTHY'];
        return darkOnlyThemes.indexOf(themeId) !== -1;
    }

    function updateTheme(theme) {
        // Enforce dark mode if the theme only supports dark
        if (checkThemeRestrictions()) {
            theme = 'dark';
        }

        document.documentElement.setAttribute('data-theme', theme);
        localStorage.setItem('theme', theme);

        if (themeCheckbox) {
            themeCheckbox.checked = theme === 'dark';
            // Disable the checkbox if restricted to dark mode
            themeCheckbox.disabled = checkThemeRestrictions();
            themeCheckbox.closest('.theme-switch').style.opacity = themeCheckbox.disabled ? '0.5' : '1';
        }
        if (themeIconLight) {
            themeIconLight.className = theme === 'dark' ? 'mdi mdi-weather-night' : 'mdi mdi-weather-sunny';
        }
        if (themeLabelSpan) {
            themeLabelSpan.textContent = theme === 'dark' ? i18n.t('Dark Mode') : i18n.t('Light Mode');
        }
    }

    async function syncModeToBookmark(mode) {
        try {
            if (!window.ShaaritThemeConfig) return;
            await window.ShaaritThemeConfig.save({ mode });
        } catch (e) {
            // eslint-disable-next-line no-console
            console.error('[shaarit] Failed to sync mode to bookmark', e);
        }
    }

    // Handle themeChanged event fired by tools.html
    window.addEventListener('themeChanged', () => {
        updateTheme(localStorage.getItem('theme') || 'dark');
    });

    // Init Theme
    const savedTheme = localStorage.getItem('theme') ||
        (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
    updateTheme(savedTheme);

    if (themeCheckbox) {
        themeCheckbox.addEventListener('change', () => {
            if (checkThemeRestrictions()) return; // Extra safety
            const next = themeCheckbox.checked ? 'dark' : 'light';
            updateTheme(next);
            // Sync mode to bookmark in background
            syncModeToBookmark(next);
        });
    }
});