// Dashcam page: scan for a USB dashcam, then trigger importing its videos.
// Uses plain fetch() (not socket.io / yaris.js) since this is a one-shot
// request/response flow, not a live data stream, and yaris.js assumes DOM
// elements (#map, #speedGraph) that don't exist on this page.

const deviceStatus = document.getElementById('dash-device-status');
const importStatus = document.getElementById('dash-import-status');
const scanBtn = document.getElementById('dash-scan-btn');
const importBtn = document.getElementById('dash-import-btn');
const fileSummary = document.getElementById('dash-file-summary');
const fileListBody = document.querySelector('#dashcam-file-list [data-data-list-body]');
const filesRefreshBtn = document.getElementById('dash-files-refresh-btn');
const deleteAllBtn = document.getElementById('dash-delete-all-btn');

function fetchJson(url, options) {
    return fetch(url, options).then(response => response.json().then(data => {
        if (!response.ok) {
            throw new Error(data.message || data.status || `HTTP ${response.status}`);
        }
        return data;
    }));
}

function formatBytes(bytes) {
    if (bytes === 0) {
        return '0 B';
    }
    const units = ['B', 'KB', 'MB', 'GB', 'TB'];
    const unit = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)), units.length - 1);
    return `${(bytes / (1024 ** unit)).toFixed(unit === 0 ? 0 : 1)} ${units[unit]}`;
}

function createCell(text) {
    const cell = document.createElement('td');
    cell.textContent = text;
    return cell;
}

function renderDashcamFiles(summary) {
    fileListBody.replaceChildren();
    if (summary.status !== 'ok') {
        fileSummary.textContent = summary.message || `Unable to list files: ${summary.status}`;
        deleteAllBtn.disabled = true;
        return;
    }

    const files = summary.files || [];

    files.forEach(file => {
        const row = document.createElement('tr');
        row.dataset.path = file.path;
        row.dataset.size = file.size;
        row.dataset.modified = file.modified_at;
        row.appendChild(createCell(file.path));
        row.appendChild(createCell(formatBytes(file.size)));
        row.appendChild(createCell(new Date(file.modified_at * 1000).toLocaleString()));

        const actions = document.createElement('td');
        actions.className = 'data-list-actions';
        const deleteButton = document.createElement('button');
        deleteButton.type = 'button';
        deleteButton.className = 'btn btn-sm btn-outline-danger';
        deleteButton.dataset.deletePath = file.path;
        deleteButton.dataset.confirm = `Permanently delete "${file.path}" from the dashcam?`;
        deleteButton.innerHTML = '<i class="fas fa-trash me-1"></i>Delete';
        actions.appendChild(deleteButton);
        row.appendChild(actions);
        fileListBody.appendChild(row);
    });

    fileSummary.textContent = `${files.length} video(s), ${formatBytes(summary.total_size || 0)} total`;
    if (summary.errors && summary.errors.length) {
        fileSummary.textContent += ` (${summary.errors.length} file error(s))`;
    }
    deleteAllBtn.disabled = files.length === 0;
}

function refreshDashcamFiles() {
    fileSummary.textContent = 'Scanning...';
    filesRefreshBtn.disabled = true;
    return fetchJson('/api/dash/files')
        .then(renderDashcamFiles)
        .catch(err => {
            fileListBody.replaceChildren();
            fileSummary.textContent = `Unable to list dashcam files: ${err.message}`;
            deleteAllBtn.disabled = true;
        })
        .finally(() => {
            filesRefreshBtn.disabled = false;
        });
}

function deleteDashcamFile(path) {
    return fetchJson('/api/dash/file', {
        method: 'DELETE',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ path }),
    }).then(result => {
        fileSummary.textContent = `Deleted ${result.deleted_count} video(s). Refreshing...`;
        return refreshDashcamFiles();
    }).catch(err => {
        fileSummary.textContent = `Delete failed: ${err.message}`;
    });
}

function describeDevice(device) {
    const label = device.label ? ` "${device.label}"` : '';
    return `${device.path}${label} (${device.size}, ${device.fstype || 'unknown fs'})`;
}

function scanForDashcam() {
    deviceStatus.textContent = 'Scanning...';
    importBtn.disabled = true;

    fetch('/api/dash/devices')
        .then(response => response.json())
        .then(data => {
            const devices = data.devices || [];
            if (devices.length === 0) {
                deviceStatus.textContent = 'No USB dashcam/storage device detected. Plug it in and scan again.';
                return;
            }
            deviceStatus.textContent = 'Detected: ' + devices.map(describeDevice).join(', ');
            importBtn.disabled = false;
        })
        .catch(err => {
            deviceStatus.textContent = 'Error while scanning: ' + err;
        });
}

function importDashcam() {
    importStatus.textContent = 'Importing... this can take a while for large videos.';
    importBtn.disabled = true;

    fetch('/api/dash/import', { method: 'POST' })
        .then(response => response.json())
        .then(summary => {
            if (summary.status !== 'ok') {
                importStatus.textContent = summary.message || ('Import failed: ' + summary.status);
                return;
            }
            let text = `Found ${summary.found} video(s), copied ${summary.copied}, skipped ${summary.skipped} (already imported).`;
            if (summary.errors && summary.errors.length > 0) {
                text += ` Errors: ${summary.errors.join('; ')}`;
            }
            importStatus.textContent = text;
            refreshDashcamFiles();
        })
        .catch(err => {
            importStatus.textContent = 'Error while importing: ' + err;
        })
        .finally(() => {
            importBtn.disabled = false;
        });
}

scanBtn.addEventListener('click', scanForDashcam);
importBtn.addEventListener('click', importDashcam);
filesRefreshBtn.addEventListener('click', refreshDashcamFiles);
fileListBody.addEventListener('click', event => {
    const deleteButton = event.target.closest('[data-delete-path]');
    if (deleteButton) {
        deleteButton.disabled = true;
        deleteDashcamFile(deleteButton.dataset.deletePath).finally(() => {
            deleteButton.disabled = false;
        });
    }
});
deleteAllBtn.addEventListener('click', () => {
    if (!window.confirm(deleteAllBtn.dataset.confirm)) {
        return;
    }
    deleteAllBtn.disabled = true;
    fetchJson('/api/dash/files', { method: 'DELETE' })
        .then(result => {
            fileSummary.textContent = `Deleted ${result.deleted_count} video(s). Refreshing...`;
            return refreshDashcamFiles();
        })
        .catch(err => {
            fileSummary.textContent = `Delete all failed: ${err.message}`;
            deleteAllBtn.disabled = false;
        });
});

// Auto-scan once when the page loads.
scanForDashcam();
refreshDashcamFiles();

// --- Remote server upload status/toggle ---

const uploadStatusEl = document.getElementById('upload-status');
const dashcamToggle = document.getElementById('dashcam-upload-toggle');

function describeUploadStatus(status) {
    if (!status.configured) {
        return 'Remote server not configured on this device (see db/upload_creds.env).';
    }
    let text = `Pending trip-log rows to upload: ${status.pending_tracking_rows}.`;
    if (status.last_success_at) {
        text += ` Last successful upload: ${status.last_success_at}`;
        if (status.last_network_path) {
            text += ` (via ${status.last_network_path === 'cellular' ? 'cellular fallback' : 'WiFi/Ethernet'})`;
        }
        text += '.';
    }
    if (status.cellular_fallback_configured) {
        text += ' Cellular (SIM868) fallback is enabled for trip logs if WiFi/Ethernet is unreachable.';
    }
    if (status.last_error) {
        text += ` Last error: ${status.last_error}.`;
    }
    return text;
}

function refreshUploadStatus() {
    fetch('/api/upload/status')
        .then(response => response.json())
        .then(status => {
            uploadStatusEl.textContent = describeUploadStatus(status);
            dashcamToggle.checked = status.dashcam_upload_enabled;
            dashcamToggle.disabled = !status.configured;
        })
        .catch(err => {
            uploadStatusEl.textContent = 'Error while checking upload status: ' + err;
        });
}

dashcamToggle.addEventListener('change', () => {
    fetch('/api/upload/dashcam_toggle', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ enabled: dashcamToggle.checked }),
    })
        .then(response => response.json())
        .then(status => {
            uploadStatusEl.textContent = describeUploadStatus(status);
            dashcamToggle.checked = status.dashcam_upload_enabled;
        })
        .catch(err => {
            uploadStatusEl.textContent = 'Error while updating toggle: ' + err;
        });
});

refreshUploadStatus();
setInterval(refreshUploadStatus, 15000);