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| 1 | +(function() { |
| 2 | + const THEME_KEY = 'fipguide-theme'; |
| 3 | + const DARK_THEME = 'dark'; |
| 4 | + const LIGHT_THEME = 'light'; |
| 5 | + const AUTO_THEME = 'auto'; |
| 6 | + |
| 7 | + function getSavedTheme() { |
| 8 | + return localStorage.getItem(THEME_KEY) || AUTO_THEME; |
| 9 | + } |
| 10 | + |
| 11 | + function saveTheme(theme) { |
| 12 | + localStorage.setItem(THEME_KEY, theme); |
| 13 | + } |
| 14 | + |
| 15 | + function getSystemTheme() { |
| 16 | + return window.matchMedia('(prefers-color-scheme: dark)').matches ? DARK_THEME : LIGHT_THEME; |
| 17 | + } |
| 18 | + |
| 19 | + function getEffectiveTheme(theme) { |
| 20 | + return theme === AUTO_THEME ? getSystemTheme() : theme; |
| 21 | + } |
| 22 | + |
| 23 | + function applyTheme(theme) { |
| 24 | + const effectiveTheme = getEffectiveTheme(theme); |
| 25 | + if (effectiveTheme === DARK_THEME) { |
| 26 | + document.documentElement.setAttribute('data-theme', DARK_THEME); |
| 27 | + } else { |
| 28 | + document.documentElement.removeAttribute('data-theme'); |
| 29 | + } |
| 30 | + } |
| 31 | + |
| 32 | + function toggleTheme() { |
| 33 | + const currentTheme = getSavedTheme(); |
| 34 | + let newTheme; |
| 35 | + |
| 36 | + if (currentTheme === LIGHT_THEME) { |
| 37 | + newTheme = DARK_THEME; |
| 38 | + } else if (currentTheme === DARK_THEME) { |
| 39 | + newTheme = AUTO_THEME; |
| 40 | + } else { |
| 41 | + newTheme = LIGHT_THEME; |
| 42 | + } |
| 43 | + |
| 44 | + saveTheme(newTheme); |
| 45 | + applyTheme(newTheme); |
| 46 | + updateToggleButtons(newTheme); |
| 47 | + } |
| 48 | + |
| 49 | + function updateToggleButtons(theme) { |
| 50 | + const toggleButtons = document.querySelectorAll('.a-theme-toggle'); |
| 51 | + |
| 52 | + toggleButtons.forEach(button => { |
| 53 | + let icon; |
| 54 | + let label; |
| 55 | + if (theme === AUTO_THEME) { |
| 56 | + icon = 'brightness_auto'; |
| 57 | + label = button.dataset.switchToLight; |
| 58 | + } else if (theme === LIGHT_THEME) { |
| 59 | + icon = 'light_mode'; |
| 60 | + label = button.dataset.switchToDark; |
| 61 | + } else if (theme === DARK_THEME) { |
| 62 | + icon = 'dark_mode'; |
| 63 | + label = button.dataset.switchToAuto; |
| 64 | + } |
| 65 | + |
| 66 | + const iconElement = button.querySelector('.material-symbols-rounded'); |
| 67 | + if(iconElement) { |
| 68 | + iconElement.textContent = icon; |
| 69 | + } |
| 70 | + button.setAttribute('title', label); |
| 71 | + button.setAttribute('aria-label', label); |
| 72 | + }); |
| 73 | + } |
| 74 | + |
| 75 | + function initializeButtons() { |
| 76 | + const savedTheme = getSavedTheme(); |
| 77 | + updateToggleButtons(savedTheme); |
| 78 | + |
| 79 | + const toggleButtons = document.querySelectorAll('.a-theme-toggle'); |
| 80 | + toggleButtons.forEach(button => { |
| 81 | + button.addEventListener('click', toggleTheme); |
| 82 | + }); |
| 83 | + |
| 84 | + window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => { |
| 85 | + if (getSavedTheme() === AUTO_THEME) { |
| 86 | + applyTheme(AUTO_THEME); |
| 87 | + } |
| 88 | + }); |
| 89 | + } |
| 90 | + |
| 91 | + applyTheme(getSavedTheme()); |
| 92 | + |
| 93 | + if (document.readyState === 'loading') { |
| 94 | + document.addEventListener('DOMContentLoaded', initializeButtons); |
| 95 | + } else { |
| 96 | + initializeButtons(); |
| 97 | + } |
| 98 | +})(); |
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