/**
 * Settings Panel Module
 * Handles user settings UI and persistence
 */

const Settings = {
    // Current settings state
    current: {},

    // DOM elements
    elements: {},

    /**
     * Initialize the settings module
     */
    init() {
        this.cacheElements();
        this.bindEvents();
    },

    /**
     * Cache DOM element references
     */
    cacheElements() {
        this.elements = {
            panel: document.getElementById('settings-panel'),
            overlay: document.getElementById('overlay'),
            btnSettings: document.getElementById('btn-settings'),
            btnClose: document.getElementById('btn-close-settings'),
            btnSave: document.getElementById('btn-save-settings'),
            btnReset: document.getElementById('btn-reset-settings'),

            // Text settings
            fontFamily: document.getElementById('font-family'),
            fontSize: document.getElementById('font-size'),
            fontSizeValue: document.getElementById('font-size-value'),
            fontWeight: document.getElementById('font-weight'),
            textColor: document.getElementById('text-color'),
            textAlign: document.getElementById('text-align'),

            // Background settings
            backgroundColor: document.getElementById('background-color'),
            backgroundOpacity: document.getElementById('background-opacity'),
            opacityValue: document.getElementById('opacity-value'),
            borderRadius: document.getElementById('border-radius'),
            radiusValue: document.getElementById('radius-value'),
            padding: document.getElementById('padding'),
            paddingValue: document.getElementById('padding-value'),

            // Behavior settings
            maxWords: document.getElementById('max-words'),
            maxWordsValue: document.getElementById('max-words-value'),

            // Caption display
            captionContainer: document.getElementById('caption-container'),
        };
    },

    /**
     * Bind event listeners
     */
    bindEvents() {
        // Panel open/close
        this.elements.btnSettings.addEventListener('click', () => this.openPanel());
        this.elements.btnClose.addEventListener('click', () => this.closePanel());
        this.elements.overlay.addEventListener('click', () => this.closePanel());

        // Save/Reset
        this.elements.btnSave.addEventListener('click', () => this.saveSettings());
        this.elements.btnReset.addEventListener('click', () => this.resetSettings());

        // Live preview on input change
        const inputs = [
            'fontFamily', 'fontSize', 'fontWeight', 'textColor', 'textAlign',
            'backgroundColor', 'backgroundOpacity', 'borderRadius', 'padding',
            'maxWords'
        ];

        inputs.forEach(name => {
            const element = this.elements[name];
            if (element) {
                element.addEventListener('input', () => this.updatePreview());
            }
        });

        // Update value displays for range inputs
        this.elements.fontSize.addEventListener('input', (e) => {
            this.elements.fontSizeValue.textContent = e.target.value;
        });
        this.elements.backgroundOpacity.addEventListener('input', (e) => {
            this.elements.opacityValue.textContent = e.target.value;
        });
        this.elements.borderRadius.addEventListener('input', (e) => {
            this.elements.radiusValue.textContent = e.target.value;
        });
        this.elements.padding.addEventListener('input', (e) => {
            this.elements.paddingValue.textContent = e.target.value;
        });
        this.elements.maxWords.addEventListener('input', (e) => {
            this.elements.maxWordsValue.textContent = e.target.value;
        });
    },

    /**
     * Open settings panel
     */
    openPanel() {
        this.elements.panel.classList.remove('hidden');
        this.elements.overlay.classList.remove('hidden');
    },

    /**
     * Close settings panel
     */
    closePanel() {
        this.elements.panel.classList.add('hidden');
        this.elements.overlay.classList.add('hidden');
    },

    /**
     * Apply settings to the UI
     */
    applySettings(settings) {
        this.current = settings;

        // Update form values
        this.elements.fontFamily.value = settings.font_family;
        this.elements.fontSize.value = settings.font_size;
        this.elements.fontSizeValue.textContent = settings.font_size;
        this.elements.fontWeight.value = settings.font_weight;
        this.elements.textColor.value = settings.text_color;
        this.elements.textAlign.value = settings.text_align;

        this.elements.backgroundColor.value = settings.background_color;
        this.elements.backgroundOpacity.value = Math.round(settings.background_opacity * 100);
        this.elements.opacityValue.textContent = Math.round(settings.background_opacity * 100);
        this.elements.borderRadius.value = settings.border_radius;
        this.elements.radiusValue.textContent = settings.border_radius;
        this.elements.padding.value = settings.padding;
        this.elements.paddingValue.textContent = settings.padding;

        this.elements.maxWords.value = settings.max_words || 30;
        this.elements.maxWordsValue.textContent = settings.max_words || 30;

        // Apply to caption container
        this.updatePreview();
    },

    /**
     * Update live preview of caption styling
     */
    updatePreview() {
        const container = this.elements.captionContainer;
        const opacity = this.elements.backgroundOpacity.value / 100;

        // Parse background color and apply opacity
        const bgColor = this.elements.backgroundColor.value;
        const r = parseInt(bgColor.slice(1, 3), 16);
        const g = parseInt(bgColor.slice(3, 5), 16);
        const b = parseInt(bgColor.slice(5, 7), 16);

        container.style.fontFamily = this.elements.fontFamily.value;
        container.style.fontSize = `${this.elements.fontSize.value}px`;
        container.style.fontWeight = this.elements.fontWeight.value;
        container.style.color = this.elements.textColor.value;
        container.style.textAlign = this.elements.textAlign.value;
        container.style.backgroundColor = `rgba(${r}, ${g}, ${b}, ${opacity})`;
        container.style.borderRadius = `${this.elements.borderRadius.value}px`;
        container.style.padding = `${this.elements.padding.value}px`;

        // Store max words for caption management
        this.current.max_words = parseInt(this.elements.maxWords.value);
    },

    /**
     * Get current form values as settings object
     */
    getFormValues() {
        return {
            font_family: this.elements.fontFamily.value,
            font_size: parseInt(this.elements.fontSize.value),
            font_weight: this.elements.fontWeight.value,
            text_color: this.elements.textColor.value,
            text_align: this.elements.textAlign.value,
            background_color: this.elements.backgroundColor.value,
            background_opacity: this.elements.backgroundOpacity.value / 100,
            border_radius: parseInt(this.elements.borderRadius.value),
            padding: parseInt(this.elements.padding.value),
            max_words: parseInt(this.elements.maxWords.value),
        };
    },

    /**
     * Save settings to server
     */
    async saveSettings() {
        const settings = this.getFormValues();

        try {
            const response = await fetch('/api/settings', {
                method: 'PUT',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(settings),
            });

            if (response.ok) {
                this.current = await response.json();
                this.closePanel();
                console.log('Settings saved');
            } else {
                console.error('Failed to save settings');
            }
        } catch (error) {
            console.error('Error saving settings:', error);
        }
    },

    /**
     * Reset settings to defaults
     */
    async resetSettings() {
        if (!confirm('Reset all settings to defaults?')) {
            return;
        }

        try {
            const response = await fetch('/api/settings/reset', {
                method: 'POST',
            });

            if (response.ok) {
                const settings = await response.json();
                this.applySettings(settings);
                console.log('Settings reset to defaults');
            } else {
                console.error('Failed to reset settings');
            }
        } catch (error) {
            console.error('Error resetting settings:', error);
        }
    },

    /**
     * Fetch settings from server
     */
    async fetchSettings() {
        try {
            const response = await fetch('/api/settings');
            if (response.ok) {
                const settings = await response.json();
                this.applySettings(settings);
            }
        } catch (error) {
            console.error('Error fetching settings:', error);
        }
    }
};