// 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 importStatusBar = document.getElementById('dash-import-status-bar');
const importStatus = document.getElementById('dash-import-status');
const importEta = document.getElementById('dash-import-eta');
const importResultBar = document.getElementById('dash-import-result-bar');
const importResult = document.getElementById('dash-import-result');
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 selectAllBtn = document.getElementById('dash-select-all-btn');
const importSelectedBtn = document.getElementById('dash-import-selected-btn');
const deleteAllBtn = document.getElementById('dash-delete-all-btn');

let importInProgress = false;
let importStartTime = null;
let importTotal = 0;
let importEtaInterval = null;
let importPollInterval = null;

function showImportProgress(msg, total) {
    importTotal = total || 0;
    importStartTime = Date.now();
    importStatus.textContent = msg;
    importEta.textContent = '';
    importStatusBar.style.display = 'flex';
    importResultBar.style.display = 'none';
    clearInterval(importEtaInterval);
    if (importTotal > 0) {
        importEtaInterval = setInterval(() => {
            const elapsed = (Date.now() - importStartTime) / 1000;
            const estTotal = importTotal * 3;
            const remaining = Math.max(0, Math.round(estTotal - elapsed));
            importEta.textContent = remaining > 0 ? `~${remaining}s remaining` : '';
        }, 1000);
    }
}

function showImportResult(msg) {
    clearInterval(importEtaInterval);
    clearInterval(importPollInterval);
    importPollInterval = null;
    importStatusBar.style.display = 'none';
    importResult.textContent = msg;
    importResultBar.style.display = 'block';
    setTimeout(() => { importResultBar.style.display = 'none'; }, 10000);
}

function fetchJson(url, options) {
    return fetch(url, options).then(response => response.json().then(data => {
        if (!response.ok) {
            const details = data.errors && data.errors.length ? data.errors.join('; ') : null;
            throw new Error(data.message || details || data.status || `HTTP ${response.status}`);
        }
        return data;
    }));
}

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

function selectedPaths() {
    return Array.from(fileListBody.querySelectorAll('[data-select-path]:checked'))
        .map(checkbox => checkbox.dataset.selectPath);
}

function updateSelectionControls() {
    const checkboxes = Array.from(fileListBody.querySelectorAll('[data-select-path]'));
    const selectedCount = selectedPaths().length;
    importSelectedBtn.disabled = importInProgress || selectedCount === 0;
    selectAllBtn.disabled = checkboxes.length === 0;
    selectAllBtn.textContent = checkboxes.length > 0 && selectedCount === checkboxes.length
        ? 'Clear selection'
        : 'Select all';
    importSelectedBtn.innerHTML = selectedCount
        ? `<i class="fas fa-download me-1"></i>Import selected (${selectedCount})`
        : '<i class="fas fa-download me-1"></i>Import selected';
}

function setImportBusy(busy) {
    importInProgress = busy;
    importBtn.disabled = busy;
    fileListBody.querySelectorAll('[data-import-path]').forEach(button => {
        button.disabled = busy;
    });
    updateSelectionControls();
}

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.className = 'dash-row';

        const selection = document.createElement('td');
        selection.className = 'dash-col-check';
        const checkbox = document.createElement('input');
        checkbox.type = 'checkbox';
        checkbox.className = 'form-check-input';
        checkbox.dataset.selectPath = file.path;
        checkbox.setAttribute('aria-label', `Select ${file.path}`);
        selection.appendChild(checkbox);
        row.appendChild(selection);

        const pathCell = createCell(file.path);
        pathCell.className = 'dash-col-file';
        row.appendChild(pathCell);

        const sizeCell = createCell(YarisUI.formatBytes(file.size));
        sizeCell.className = 'dash-col-size';
        row.appendChild(sizeCell);

        const dateCell = createCell(new Date(file.modified_at * 1000).toLocaleString());
        dateCell.className = 'dash-col-date';
        row.appendChild(dateCell);

        const actionsTd = document.createElement('td');
        actionsTd.className = 'dash-actions-td';
        const actionsDiv = document.createElement('div');
        actionsDiv.className = 'data-list-actions';

        const importButton = document.createElement('button');
        importButton.type = 'button';
        importButton.className = 'btn btn-sm btn-outline-primary btn-icon-mobile';
        importButton.dataset.importPath = file.path;
        importButton.innerHTML = '<i class="fas fa-download"></i><span class="btn-label"> Import</span>';
        actionsDiv.appendChild(importButton);

        const deleteButton = document.createElement('button');
        deleteButton.type = 'button';
        deleteButton.className = 'btn btn-sm btn-outline-danger btn-icon-mobile';
        deleteButton.dataset.deletePath = file.path;
        deleteButton.dataset.confirm = `Permanently delete "${file.path}" from the dashcam?`;
        deleteButton.innerHTML = '<i class="fas fa-trash"></i><span class="btn-label"> Delete</span>';
        actionsDiv.appendChild(deleteButton);
        actionsTd.appendChild(actionsDiv);
        row.appendChild(actionsTd);
        fileListBody.appendChild(row);
    });

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

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;
            updateSelectionControls();
        })
        .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 describeImportResult(job) {
    let text = `Copied ${job.copied}, skipped ${job.skipped} (already imported).`;
    if (job.errors && job.errors.length) {
        text += ` Errors: ${job.errors.join('; ')}`;
    }
    return text;
}

function pollImportStatus() {
    fetch('/api/dash/import/status')
        .then(r => r.json())
        .then(job => {
            if (!job || job.status === 'none' || job.status === 'running') return;
            clearInterval(importPollInterval);
            importPollInterval = null;
            setImportBusy(false);
            if (job.status === 'ok') {
                showImportResult(describeImportResult(job));
                refreshDashcamFiles();
            } else {
                showImportResult(job.message || `Import failed: ${job.status}`);
            }
        })
        .catch(() => {}); // ignore transient network errors while polling
}

function startImport(paths) {
    const label = paths ? `Importing ${paths.length} video(s)…` : 'Importing all videos… this can take a while.';
    showImportProgress(label, paths ? paths.length : 0);
    setImportBusy(true);

    const body = paths ? JSON.stringify({ paths }) : undefined;
    fetch('/api/dash/import', {
        method: 'POST',
        headers: body ? { 'Content-Type': 'application/json' } : {},
        body,
    })
        .then(r => r.json())
        .then(data => {
            if (data.status === 'busy') {
                showImportResult(data.message || 'Import already in progress.');
                setImportBusy(false);
                return;
            }
            if (data.status !== 'started') {
                showImportResult(data.message || `Import error: ${data.status}`);
                setImportBusy(false);
                return;
            }
            clearInterval(importPollInterval);
            importPollInterval = setInterval(pollImportStatus, 3000);
        })
        .catch(err => {
            showImportResult(`Import request failed: ${err}`);
            setImportBusy(false);
        });
}

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;
        });
}

scanBtn.addEventListener('click', scanForDashcam);
importBtn.addEventListener('click', () => startImport(null));
filesRefreshBtn.addEventListener('click', refreshDashcamFiles);
fileListBody.addEventListener('click', event => {
    const importButton = event.target.closest('[data-import-path]');
    if (importButton) {
        startImport([importButton.dataset.importPath]);
        return;
    }

    const deleteButton = event.target.closest('[data-delete-path]');
    if (deleteButton) {
        deleteButton.disabled = true;
        deleteDashcamFile(deleteButton.dataset.deletePath).finally(() => {
            deleteButton.disabled = false;
        });
    }
});
fileListBody.addEventListener('change', event => {
    if (event.target.matches('[data-select-path]')) {
        updateSelectionControls();
    }
});
importSelectedBtn.addEventListener('click', () => {
    const paths = selectedPaths();
    if (paths.length) {
        startImport(paths);
    }
});
selectAllBtn.addEventListener('click', () => {
    const checkboxes = Array.from(fileListBody.querySelectorAll('[data-select-path]'));
    const shouldSelect = checkboxes.some(checkbox => !checkbox.checked);
    checkboxes.forEach(checkbox => {
        checkbox.checked = shouldSelect;
    });
    updateSelectionControls();
});
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;
        });
});

// Check if an import is already running when page loads (e.g. after refresh mid-import)
fetch('/api/dash/import/status')
    .then(r => r.json())
    .then(job => {
        if (job && job.status === 'running') {
            showImportProgress('Import in progress…', 0);
            setImportBusy(true);
            importPollInterval = setInterval(pollImportStatus, 3000);
        }
    })
    .catch(() => {});

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

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