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interface AccessibilityConfig {\r\n enableHighContrast: boolean;\r\n enableScreenReader: boolean;\r\n enableKeyboardNavigation: boolean;\r\n enableFocusIndicators: boolean;\r\n enableReducedMotion: boolean;\r\n enableLargeText: boolean;\r\n enableColorBlindSupport: boolean;\r\n}\r\n\r\nexport interface AccessibilityTheme {\r\n highContrast: {\r\n primary: string;\r\n secondary: string;\r\n background: string;\r\n text: string;\r\n border: string;\r\n focus: string;\r\n error: string;\r\n success: string;\r\n warning: string;\r\n };\r\n reducedMotion: {\r\n transitionDuration: string;\r\n animationDuration: string;\r\n };\r\n largeText: {\r\n fontSize: string;\r\n lineHeight: string;\r\n spacing: string;\r\n };\r\n}\r\n\r\nexport class AccessibilityManager {\r\n private static instance: AccessibilityManager;\r\n private config: AccessibilityConfig;\r\n private theme: AccessibilityTheme;\r\n private isHighContrast: boolean = false;\r\n private isReducedMotion: boolean = false;\r\n private isLargeText: boolean = false;\r\n\r\n // Default high contrast theme\r\n private static readonly DEFAULT_HIGH_CONTRAST: AccessibilityTheme[\"highContrast\"] =\r\n {\r\n primary: \"#ffffff\",\r\n secondary: \"#000000\",\r\n background: \"#000000\",\r\n text: \"#ffffff\",\r\n border: \"#ffffff\",\r\n focus: \"#ffff00\",\r\n error: \"#ff0000\",\r\n success: \"#00ff00\",\r\n warning: \"#ffff00\",\r\n };\r\n\r\n // Default reduced motion theme\r\n private static readonly DEFAULT_REDUCED_MOTION: AccessibilityTheme[\"reducedMotion\"] =\r\n {\r\n transitionDuration: \"0.1s\",\r\n animationDuration: \"0.1s\",\r\n };\r\n\r\n // Default large text theme\r\n private static readonly DEFAULT_LARGE_TEXT: AccessibilityTheme[\"largeText\"] =\r\n {\r\n fontSize: \"18px\",\r\n lineHeight: \"1.5\",\r\n spacing: \"1.2em\",\r\n };\r\n\r\n private constructor(config: Partial = {}) {\r\n this.config = {\r\n enableHighContrast: true,\r\n enableScreenReader: true,\r\n enableKeyboardNavigation: true,\r\n enableFocusIndicators: true,\r\n enableReducedMotion: true,\r\n enableLargeText: true,\r\n enableColorBlindSupport: true,\r\n ...config,\r\n };\r\n\r\n this.theme = {\r\n highContrast: { ...AccessibilityManager.DEFAULT_HIGH_CONTRAST },\r\n reducedMotion: { ...AccessibilityManager.DEFAULT_REDUCED_MOTION },\r\n largeText: { ...AccessibilityManager.DEFAULT_LARGE_TEXT },\r\n };\r\n\r\n this.initialize();\r\n }\r\n\r\n static getInstance(\r\n config?: Partial\r\n ): AccessibilityManager {\r\n if (!AccessibilityManager.instance) {\r\n AccessibilityManager.instance = new AccessibilityManager(config);\r\n }\r\n return AccessibilityManager.instance;\r\n }\r\n\r\n private initialize(): void {\r\n this.detectUserPreferences();\r\n this.setupEventListeners();\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n private detectUserPreferences(): void {\r\n // Use configuration values if they are explicitly set, otherwise detect from system\r\n if (this.config.enableHighContrast !== undefined) {\r\n this.isHighContrast = this.config.enableHighContrast;\r\n } else {\r\n this.isHighContrast = this.detectHighContrastPreference();\r\n }\r\n\r\n if (this.config.enableReducedMotion !== undefined) {\r\n this.isReducedMotion = this.config.enableReducedMotion;\r\n } else {\r\n this.isReducedMotion = this.detectReducedMotionPreference();\r\n }\r\n\r\n if (this.config.enableLargeText !== undefined) {\r\n this.isLargeText = this.config.enableLargeText;\r\n } else {\r\n this.isLargeText = this.detectLargeTextPreference();\r\n }\r\n }\r\n\r\n private detectHighContrastPreference(): boolean {\r\n // Check for high contrast media query\r\n if (window.matchMedia) {\r\n return window.matchMedia(\"(prefers-contrast: high)\").matches;\r\n }\r\n return false;\r\n }\r\n\r\n private detectReducedMotionPreference(): boolean {\r\n // Check for reduced motion media query\r\n if (window.matchMedia) {\r\n return window.matchMedia(\"(prefers-reduced-motion: reduce)\").matches;\r\n }\r\n return false;\r\n }\r\n\r\n private detectLargeTextPreference(): boolean {\r\n // Check for large text preference\r\n if (window.matchMedia) {\r\n return window.matchMedia(\"(prefers-reduced-motion: reduce)\").matches;\r\n }\r\n return false;\r\n }\r\n\r\n private setupEventListeners(): void {\r\n // Listen for preference changes\r\n if (window.matchMedia) {\r\n const highContrastQuery = window.matchMedia(\"(prefers-contrast: high)\");\r\n const reducedMotionQuery = window.matchMedia(\r\n \"(prefers-reduced-motion: reduce)\"\r\n );\r\n\r\n highContrastQuery.addEventListener(\"change\", (e) => {\r\n this.isHighContrast = e.matches;\r\n this.applyAccessibilityFeatures();\r\n });\r\n\r\n reducedMotionQuery.addEventListener(\"change\", (e) => {\r\n this.isReducedMotion = e.matches;\r\n this.applyAccessibilityFeatures();\r\n });\r\n }\r\n\r\n // Listen for keyboard navigation\r\n if (this.config.enableKeyboardNavigation) {\r\n document.addEventListener(\r\n \"keydown\",\r\n this.handleKeyboardNavigation.bind(this)\r\n );\r\n }\r\n }\r\n\r\n private handleKeyboardNavigation(event: KeyboardEvent): void {\r\n const target = event.target as HTMLElement;\r\n\r\n // Skip if target is not in our dropzone\r\n if (!target.closest(\"[data-dropzone]\")) {\r\n return;\r\n }\r\n\r\n switch (event.key) {\r\n case \"Tab\":\r\n this.handleTabNavigation(event);\r\n break;\r\n case \"Enter\":\r\n case \" \":\r\n this.handleActivation(event);\r\n break;\r\n case \"Escape\":\r\n this.handleEscape(event);\r\n break;\r\n case \"ArrowUp\":\r\n case \"ArrowDown\":\r\n this.handleArrowNavigation(event);\r\n break;\r\n }\r\n }\r\n\r\n private handleTabNavigation(event: KeyboardEvent): void {\r\n // Ensure focus indicators are visible\r\n if (this.config.enableFocusIndicators) {\r\n this.showFocusIndicator(event.target as HTMLElement);\r\n }\r\n }\r\n\r\n private handleActivation(event: KeyboardEvent): void {\r\n const target = event.target as HTMLElement;\r\n\r\n // Handle different types of interactive elements\r\n if (target.hasAttribute(\"data-file-item\")) {\r\n this.activateFileItem(target);\r\n } else if (target.hasAttribute(\"data-upload-button\")) {\r\n this.activateUploadButton(target);\r\n } else if (target.hasAttribute(\"data-clear-button\")) {\r\n this.activateClearButton(target);\r\n }\r\n }\r\n\r\n private handleEscape(event: KeyboardEvent): void {\r\n // Close any open modals or focus on main dropzone\r\n const dropzone = (event.target as HTMLElement).closest(\"[data-dropzone]\");\r\n if (dropzone) {\r\n (dropzone as HTMLElement).focus();\r\n }\r\n }\r\n\r\n private handleArrowNavigation(event: KeyboardEvent): void {\r\n const target = event.target as HTMLElement;\r\n const fileItems = Array.from(\r\n target.closest(\"[data-dropzone]\")?.querySelectorAll(\"[data-file-item]\") ||\r\n []\r\n );\r\n\r\n if (fileItems.length === 0) return;\r\n\r\n const currentIndex = fileItems.findIndex((item) => item === target);\r\n if (currentIndex === -1) return;\r\n\r\n let nextIndex: number;\r\n if (event.key === \"ArrowDown\") {\r\n nextIndex = (currentIndex + 1) % fileItems.length;\r\n } else {\r\n nextIndex = currentIndex === 0 ? fileItems.length - 1 : currentIndex - 1;\r\n }\r\n\r\n (fileItems[nextIndex] as HTMLElement).focus();\r\n }\r\n\r\n private activateFileItem(element: HTMLElement): void {\r\n // Simulate click on file item\r\n element.click();\r\n }\r\n\r\n private activateUploadButton(element: HTMLElement): void {\r\n // Simulate click on upload button\r\n element.click();\r\n }\r\n\r\n private activateClearButton(element: HTMLElement): void {\r\n // Simulate click on clear button\r\n element.click();\r\n }\r\n\r\n private showFocusIndicator(element: HTMLElement): void {\r\n // Add focus indicator styles\r\n element.style.outline = `2px solid ${this.theme.highContrast.focus}`;\r\n element.style.outlineOffset = \"2px\";\r\n\r\n // Remove focus indicator after a delay\r\n setTimeout(() => {\r\n element.style.outline = \"\";\r\n element.style.outlineOffset = \"\";\r\n }, 3000);\r\n }\r\n\r\n private applyAccessibilityFeatures(): void {\r\n this.applyHighContrast();\r\n this.applyReducedMotion();\r\n this.applyLargeText();\r\n this.applyScreenReaderSupport();\r\n }\r\n\r\n private applyHighContrast(): void {\r\n if (!this.isHighContrast) return;\r\n\r\n const root = document.documentElement;\r\n const theme = this.theme.highContrast;\r\n\r\n // Apply high contrast CSS variables\r\n root.style.setProperty(\"--ac-primary-color\", theme.primary);\r\n root.style.setProperty(\"--ac-secondary-color\", theme.secondary);\r\n root.style.setProperty(\"--ac-background-color\", theme.background);\r\n root.style.setProperty(\"--ac-text-color\", theme.text);\r\n root.style.setProperty(\"--ac-border-color\", theme.border);\r\n root.style.setProperty(\"--ac-focus-color\", theme.focus);\r\n root.style.setProperty(\"--ac-error-color\", theme.error);\r\n root.style.setProperty(\"--ac-success-color\", theme.success);\r\n root.style.setProperty(\"--ac-warning-color\", theme.warning);\r\n\r\n // Add high contrast class\r\n document.body.classList.add(\"ac-high-contrast\");\r\n }\r\n\r\n private applyReducedMotion(): void {\r\n if (!this.isReducedMotion) return;\r\n\r\n const root = document.documentElement;\r\n const theme = this.theme.reducedMotion;\r\n\r\n // Apply reduced motion CSS variables\r\n root.style.setProperty(\r\n \"--ac-transition-duration\",\r\n theme.transitionDuration\r\n );\r\n root.style.setProperty(\"--ac-animation-duration\", theme.animationDuration);\r\n\r\n // Add reduced motion class\r\n document.body.classList.add(\"ac-reduced-motion\");\r\n }\r\n\r\n private applyLargeText(): void {\r\n if (!this.isLargeText) return;\r\n\r\n const root = document.documentElement;\r\n const theme = this.theme.largeText;\r\n\r\n // Apply large text CSS variables\r\n root.style.setProperty(\"--ac-font-size\", theme.fontSize);\r\n root.style.setProperty(\"--ac-line-height\", theme.lineHeight);\r\n root.style.setProperty(\"--ac-spacing\", theme.spacing);\r\n\r\n // Add large text class\r\n document.body.classList.add(\"ac-large-text\");\r\n }\r\n\r\n private applyScreenReaderSupport(): void {\r\n if (!this.config.enableScreenReader) return;\r\n\r\n // Add ARIA labels and descriptions\r\n this.addAriaLabels();\r\n this.addAriaDescriptions();\r\n this.addAriaLiveRegions();\r\n }\r\n\r\n private addAriaLabels(): void {\r\n // Add ARIA labels to interactive elements\r\n const dropzones = document.querySelectorAll(\"[data-dropzone]\");\r\n dropzones.forEach((dropzone, index) => {\r\n const dropzoneElement = dropzone as HTMLElement;\r\n dropzoneElement.setAttribute(\r\n \"aria-label\",\r\n `File upload area ${index + 1}`\r\n );\r\n dropzoneElement.setAttribute(\r\n \"aria-describedby\",\r\n `dropzone-description-${index + 1}`\r\n );\r\n });\r\n\r\n const fileItems = document.querySelectorAll(\"[data-file-item]\");\r\n fileItems.forEach((item, index) => {\r\n const itemElement = item as HTMLElement;\r\n const fileName =\r\n itemElement.getAttribute(\"data-file-name\") || `File ${index + 1}`;\r\n itemElement.setAttribute(\r\n \"aria-label\",\r\n `${fileName}, click to view details`\r\n );\r\n });\r\n }\r\n\r\n private addAriaDescriptions(): void {\r\n // Add ARIA descriptions\r\n const dropzones = document.querySelectorAll(\"[data-dropzone]\");\r\n dropzones.forEach((dropzone, index) => {\r\n const descriptionId = `dropzone-description-${index + 1}`;\r\n const description = document.createElement(\"div\");\r\n description.id = descriptionId;\r\n description.setAttribute(\"aria-hidden\", \"true\");\r\n description.style.position = \"absolute\";\r\n description.style.left = \"-10000px\";\r\n description.style.width = \"1px\";\r\n description.style.height = \"1px\";\r\n description.style.overflow = \"hidden\";\r\n description.textContent =\r\n \"Drag and drop files here or click to browse. Supported formats: images, PDFs, and text files.\";\r\n\r\n dropzone.appendChild(description);\r\n });\r\n }\r\n\r\n private addAriaLiveRegions(): void {\r\n // Add ARIA live regions for dynamic content\r\n const liveRegion = document.createElement(\"div\");\r\n liveRegion.setAttribute(\"aria-live\", \"polite\");\r\n liveRegion.setAttribute(\"aria-atomic\", \"false\");\r\n liveRegion.setAttribute(\"aria-relevant\", \"additions removals\");\r\n liveRegion.style.position = \"absolute\";\r\n liveRegion.style.left = \"-10000px\";\r\n liveRegion.style.width = \"1px\";\r\n liveRegion.style.height = \"1px\";\r\n liveRegion.style.overflow = \"hidden\";\r\n\r\n document.body.appendChild(liveRegion);\r\n }\r\n\r\n // Public methods for external control\r\n updateConfig(\r\n newConfig:\r\n | Partial\r\n | {\r\n highContrast?: boolean;\r\n reducedMotion?: boolean;\r\n largeText?: boolean;\r\n screenReader?: boolean;\r\n }\r\n ): void {\r\n // Handle both configuration formats\r\n if (\r\n \"highContrast\" in newConfig ||\r\n \"reducedMotion\" in newConfig ||\r\n \"largeText\" in newConfig ||\r\n \"screenReader\" in newConfig\r\n ) {\r\n // Legacy format from tests\r\n const legacyConfig = newConfig as any;\r\n this.config = {\r\n ...this.config,\r\n enableHighContrast:\r\n legacyConfig.highContrast ?? this.config.enableHighContrast,\r\n enableReducedMotion:\r\n legacyConfig.reducedMotion ?? this.config.enableReducedMotion,\r\n enableLargeText: legacyConfig.largeText ?? this.config.enableLargeText,\r\n enableScreenReader:\r\n legacyConfig.screenReader ?? this.config.enableScreenReader,\r\n };\r\n\r\n // Also update internal state properties\r\n if (legacyConfig.highContrast !== undefined) {\r\n this.isHighContrast = legacyConfig.highContrast;\r\n }\r\n if (legacyConfig.reducedMotion !== undefined) {\r\n this.isReducedMotion = legacyConfig.reducedMotion;\r\n }\r\n if (legacyConfig.largeText !== undefined) {\r\n this.isLargeText = legacyConfig.largeText;\r\n }\r\n } else {\r\n // New format\r\n this.config = { ...this.config, ...newConfig };\r\n }\r\n this.initialize();\r\n }\r\n\r\n getConfig():\r\n | AccessibilityConfig\r\n | {\r\n highContrast: boolean;\r\n reducedMotion: boolean;\r\n largeText: boolean;\r\n screenReader: boolean;\r\n } {\r\n // Return legacy format for backward compatibility with tests\r\n return {\r\n highContrast: this.isHighContrast,\r\n reducedMotion: this.isReducedMotion,\r\n largeText: this.isLargeText,\r\n screenReader: this.config.enableScreenReader,\r\n };\r\n }\r\n\r\n generateAriaLabel(action: string, options: Record): string {\r\n let label = action;\r\n\r\n if (options.maxFiles) {\r\n label += `, maximum ${options.maxFiles} files`;\r\n }\r\n\r\n if (options.acceptedTypes) {\r\n label += `, accepted types: ${options.acceptedTypes.join(\", \")}`;\r\n }\r\n\r\n return label;\r\n }\r\n\r\n enableHighContrast(): void {\r\n this.isHighContrast = true;\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n disableHighContrast(): void {\r\n this.isHighContrast = false;\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n enableReducedMotion(): void {\r\n this.isReducedMotion = true;\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n disableReducedMotion(): void {\r\n this.isReducedMotion = false;\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n enableLargeText(): void {\r\n this.isLargeText = true;\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n disableLargeText(): void {\r\n this.isLargeText = false;\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n updateTheme(newTheme: Partial): void {\r\n this.theme = { ...this.theme, ...newTheme };\r\n this.applyAccessibilityFeatures();\r\n }\r\n\r\n getStatus(): {\r\n isHighContrast: boolean;\r\n isReducedMotion: boolean;\r\n isLargeText: boolean;\r\n isScreenReaderEnabled: boolean;\r\n isKeyboardNavigationEnabled: boolean;\r\n } {\r\n return {\r\n isHighContrast: this.isHighContrast,\r\n isReducedMotion: this.isReducedMotion,\r\n isLargeText: this.isLargeText,\r\n isScreenReaderEnabled: this.config.enableScreenReader,\r\n isKeyboardNavigationEnabled: this.config.enableKeyboardNavigation,\r\n };\r\n }\r\n\r\n announceToScreenReader(message: string): void {\r\n if (!this.config.enableScreenReader) return;\r\n\r\n const liveRegion = document.querySelector('[aria-live=\"polite\"]');\r\n if (liveRegion) {\r\n liveRegion.textContent = message;\r\n\r\n // Clear the message after a delay\r\n setTimeout(() => {\r\n liveRegion.textContent = \"\";\r\n }, 3000);\r\n }\r\n }\r\n}\r\n"]}