/**
 * UI rendering and DOM manipulation
 */

// WebGPU/Model control getters
function getModelSelect() {
    return document.getElementById('model-select');
}

function getLoadModelBtn() {
    return document.getElementById('load-model-btn');
}

function getLoadingProgress() {
    return document.getElementById('loading-progress');
}

function getProgressFill() {
    return document.getElementById('progress-fill');
}

function getProgressText() {
    return document.getElementById('progress-text');
}

function getModelStatus() {
    return document.getElementById('model-status');
}

function getWebGPUStatus() {
    return document.getElementById('webgpu-status');
}

function getModelSection() {
    return document.getElementById('model-section');
}

function getReloadModelBtn() {
    return document.getElementById('reload-model-btn');
}

function getClearCacheBtn() {
    return document.getElementById('clear-cache-btn');
}

function getCacheInfo() {
    return document.getElementById('cache-info');
}

/**
 * Populate model selector with available models
 * @param {Array} models - Array of model configurations
 */
export function populateModelSelector(models) {
    const modelSelect = getModelSelect();
    if (!modelSelect) return;

    modelSelect.innerHTML = '';
    models.forEach(model => {
        const option = document.createElement('option');
        option.value = model.id;
        const noteText = model.note ? ` - ${model.note}` : '';
        option.textContent = `${model.label} (${model.size}${noteText})`;
        modelSelect.appendChild(option);
    });
}

/**
 * Show/hide model section based on inference mode
 * @param {boolean} show - Whether to show the model section
 */
export function toggleModelSection(show) {
    const modelSection = getModelSection();
    if (modelSection) {
        if (show) {
            modelSection.classList.remove('hidden');
        } else {
            modelSection.classList.add('hidden');
        }
    }
}

/**
 * Update loading progress
 * @param {number} percent - Progress percentage (0-100), or -1 for indeterminate
 */
export function updateLoadingProgress(percent) {
    const progressFill = getProgressFill();
    const progressBar = getLoadingProgress();

    // Handle indeterminate state (percent < 0)
    if (progressBar) {
        if (percent < 0) {
            progressBar.classList.add('indeterminate');
        } else {
            progressBar.classList.remove('indeterminate');
        }
    }

    if (progressFill) {
        progressFill.style.width = percent < 0 ? '30%' : `${percent}%`;
    }
}

/**
 * Show/hide loading progress
 * @param {boolean} show - Whether to show the progress bar
 */
export function showLoadingProgress(show) {
    const loadingProgress = getLoadingProgress();
    if (loadingProgress) {
        loadingProgress.style.display = show ? 'block' : 'none';
    }
}

/**
 * Show/hide the model input wrapper (dropdown + load button)
 * @param {boolean} show - Whether to show the input wrapper
 */
export function showModelInputWrapper(show) {
    const wrapper = document.querySelector('.model-input-wrapper');
    if (wrapper) {
        wrapper.style.display = show ? 'flex' : 'none';
    }
}

/**
 * Update model status display
 * @param {string} message - Status message
 * @param {string} type - Status type ('success', 'error', 'loading', or '')
 */
export function updateModelStatus(message, type = '') {
    const modelStatus = getModelStatus();
    if (modelStatus) {
        modelStatus.textContent = message;
        modelStatus.className = 'model-status';
        if (type) {
            modelStatus.classList.add(type);
        }
        modelStatus.style.display = message ? 'block' : 'none';
    }
}

/**
 * Update WebGPU status display
 * @param {string} message - Status message
 * @param {boolean} available - Whether WebGPU is available
 */
export function updateWebGPUStatus(message, available) {
    const webgpuStatus = getWebGPUStatus();
    if (webgpuStatus) {
        webgpuStatus.textContent = message;
        webgpuStatus.className = 'webgpu-status';
        if (available) {
            webgpuStatus.classList.add('available');
        } else {
            webgpuStatus.classList.add('unavailable');
        }
    }
}

/**
 * Enable/disable model loading button
 * @param {boolean} enabled - Whether to enable the button
 */
export function setLoadModelButtonEnabled(enabled) {
    const loadModelBtn = getLoadModelBtn();
    if (loadModelBtn) {
        loadModelBtn.disabled = !enabled;
    }
}

/**
 * Get selected model ID
 * @returns {string|null}
 */
export function getSelectedModelId() {
    const modelSelect = getModelSelect();
    return modelSelect ? modelSelect.value : null;
}

/**
 * Update button states based on model load status
 * @param {boolean} modelLoaded - Whether the model is loaded
 */
export function updateButtonStates(modelLoaded) {
    const tooltipText = modelLoaded ? '' : 'Load a model first';

    // Update live caption button
    const liveCaptionBtn = document.getElementById('start-live-caption-btn');
    if (liveCaptionBtn) {
        liveCaptionBtn.disabled = !modelLoaded;
        liveCaptionBtn.title = tooltipText;
        // Update button text based on model state
        if (!modelLoaded) {
            liveCaptionBtn.textContent = 'Load Model Below';
        } else {
            liveCaptionBtn.textContent = 'Start';
        }
    }
}

/**
 * Set up event listeners (simplified - only for model loading)
 * @param {Function} onSend - Not used (kept for compatibility)
 * @param {Function} onLoadModel - Callback for load model button
 * @param {Function} onReloadModel - Callback for reload model button
 */
export function setupEventListeners(onSend, onLoadModel, onReloadModel) {
    // Load model button
    const loadModelBtn = getLoadModelBtn();
    if (loadModelBtn && onLoadModel) {
        loadModelBtn.addEventListener('click', onLoadModel);
    }

    // Reload model button
    const reloadModelBtn = getReloadModelBtn();
    if (reloadModelBtn && onReloadModel) {
        reloadModelBtn.addEventListener('click', onReloadModel);
    }
}

/**
 * Update cache info display
 * @param {number} usedBytes - Bytes used by cache
 */
export function updateCacheInfo(usedBytes) {
    const cacheInfoEl = getCacheInfo();
    const clearCacheBtn = getClearCacheBtn();

    if (!cacheInfoEl) return;

    if (usedBytes > 0) {
        const usedMB = usedBytes / 1024 / 1024;
        if (usedMB >= 1000) {
            cacheInfoEl.textContent = `${(usedMB / 1024).toFixed(1)} GB cached`;
        } else if (usedMB >= 1) {
            cacheInfoEl.textContent = `${usedMB.toFixed(0)} MB cached`;
        } else {
            cacheInfoEl.textContent = 'No models cached';
        }
        if (clearCacheBtn) {
            clearCacheBtn.disabled = usedMB < 1;
        }
    } else {
        cacheInfoEl.textContent = 'No models cached';
        if (clearCacheBtn) {
            clearCacheBtn.disabled = true;
        }
    }
}

/**
 * Set up clear cache button handler
 * @param {Function} onClearCache - Callback for clear cache button
 */
export function setupClearCacheHandler(onClearCache) {
    const clearCacheBtn = getClearCacheBtn();
    if (clearCacheBtn && onClearCache) {
        clearCacheBtn.addEventListener('click', onClearCache);
    }
}

/**
 * Set clear cache button text
 * @param {string} text - Button text
 */
export function setClearCacheButtonText(text) {
    const clearCacheBtn = getClearCacheBtn();
    if (clearCacheBtn) {
        clearCacheBtn.textContent = text;
    }
}