// ── Tab switching ──────────────────────────────────
function initCourseTabs() {
    var tabs = document.querySelectorAll('.action-tab');
    tabs.forEach(function(tab) {
        tab.addEventListener('click', function() {
            tabs.forEach(function(t) {
                t.classList.remove('is-active');
                t.setAttribute('aria-selected', 'false');
            });
            tab.classList.add('is-active');
            tab.setAttribute('aria-selected', 'true');

            document.querySelectorAll('.action-pane').forEach(function(pane) {
                pane.hidden = true;
                pane.classList.remove('is-active');
            });

            var targetId = 'tab-pane-' + tab.dataset.tab;
            var pane = document.getElementById(targetId);
            if (pane) {
                pane.hidden = false;
                pane.classList.add('is-active');
            }
        });
    });
}

// ── Live filter ────────────────────────────────────
function initCourseLiveFilter() {
    var input = document.getElementById('course-filter-input');
    if (!input) return;

    input.addEventListener('input', function() {
        var q = input.value.toLowerCase().trim();
        var rows = document.querySelectorAll('.course-row');
        var visible = 0;

        rows.forEach(function(row) {
            var name = row.dataset.courseName || '';
            var city = row.dataset.courseCity || '';
            var match = !q || name.includes(q) || city.includes(q);

            row.hidden = !match;

            // Keep the expanded content sibling in sync
            var next = row.nextElementSibling;
            if (next && next.classList.contains('expanded-content')) {
                next.hidden = !match;
            }

            if (match) visible++;
        });

        var visibleEl = document.getElementById('visible-count');
        if (visibleEl) visibleEl.textContent = visible;
    });
}

// ── Count display ──────────────────────────────────
function initCourseCounts() {
    var grid = document.querySelector('.course-grid');
    var total = grid ? parseInt(grid.dataset.totalCount || '0', 10) : 0;
    var rows = document.querySelectorAll('.course-row');
    var visible = 0;
    rows.forEach(function(r) { if (!r.hidden) visible++; });

    var totalEl = document.getElementById('total-count');
    var visibleEl = document.getElementById('visible-count');
    if (totalEl) totalEl.textContent = total;
    if (visibleEl) visibleEl.textContent = visible || total;
}

// ── Course row expand/collapse ─────────────────────
function toggleCourseLayouts(courseId) {
    var row = document.querySelector('.course-row[data-course-id="' + courseId + '"]');
    var content = document.getElementById('course-layouts-' + courseId);
    if (!row || !content) return;

    var isOpen = content.classList.contains('is-open');

    if (isOpen) {
        content.classList.remove('is-open');
        row.classList.remove('row-open');
    } else {
        content.classList.add('is-open');
        row.classList.add('row-open');

        // Lazy-load layouts on first expand
        var cell = content.querySelector('.expanded-cell');
        if (cell && cell.dataset.loaded !== 'true') {
            cell.dataset.loaded = 'true';
            htmx.ajax('GET', '/partials/course-layouts/' + courseId, { target: cell, swap: 'innerHTML' });
        }
    }
}

// ── Mobile course card toggle ──────────────────────
var openMobileCourseId = null;

function toggleMobileCourseLayouts(courseId) {
    var card = document.getElementById('m-course-' + courseId);
    if (!card) return;

    var isOpen = card.classList.contains('is-open');

    // Close previously open card
    if (openMobileCourseId !== null && openMobileCourseId !== courseId) {
        var prevCard = document.getElementById('m-course-' + openMobileCourseId);
        if (prevCard) {
            prevCard.classList.remove('is-open');
            prevCard.setAttribute('aria-expanded', 'false');
        }
        openMobileCourseId = null;
    }

    if (isOpen) {
        card.classList.remove('is-open');
        card.setAttribute('aria-expanded', 'false');
        openMobileCourseId = null;
        return;
    }

    card.classList.add('is-open');
    card.setAttribute('aria-expanded', 'true');
    openMobileCourseId = courseId;

    // Lazy-load layouts on first expand
    var container = document.getElementById('m-layouts-container-' + courseId);
    if (container && container.dataset.loaded !== 'true') {
        htmx.ajax('GET', '/partials/course-layouts/' + courseId, { target: '#m-layouts-container-' + courseId, swap: 'innerHTML' });
        container.dataset.loaded = 'true';
    }
}

// ── Inactive layouts toggle ────────────────────────
function toggleInactiveLayouts(btn) {
    var body = btn.nextElementSibling;
    if (!body) return;

    var isOpen = btn.classList.contains('is-open');
    btn.classList.toggle('is-open', !isOpen);
    btn.setAttribute('aria-expanded', String(!isOpen));
    body.hidden = isOpen;
}

// ── Scrape courses ─────────────────────────────────
async function scrapeCourses() {
    var btn = document.getElementById('scrape-courses-btn');
    if (btn) {
        btn.disabled = true;
        btn.textContent = 'Scraping...';
    }

    try {
        var response = await fetch('/api/scrape-courses', { method: 'POST' });
        var data = await response.json();

        if (data.success) {
            alert(data.message);
            htmx.trigger(document.body, 'refresh');
        } else {
            alert('Failed to scrape courses');
        }
    } catch (error) {
        console.error('Error scraping courses:', error);
        alert('Error scraping courses');
    } finally {
        if (btn) {
            btn.disabled = false;
            btn.textContent = 'Scrape Courses';
        }
    }
}

// ── Scrape layouts for a course ────────────────────
async function scrapeLayouts(courseId, btn) {
    if (btn) btn.classList.add('spinning');

    try {
        var response = await fetch('/api/scrape-layouts/' + courseId, { method: 'POST' });
        var data = await response.json();

        if (response.status === 409) {
            alert(data.message || 'Scrape already in progress for this course. Please wait.');
        } else if (data.success) {
            // Reload expanded layout content if currently open
            var content = document.getElementById('course-layouts-' + courseId);
            if (content && content.classList.contains('is-open')) {
                var cell = content.querySelector('.expanded-cell');
                if (cell) {
                    cell.dataset.loaded = 'true';
                    htmx.ajax('GET', '/partials/course-layouts/' + courseId, { target: cell, swap: 'innerHTML' });
                }
            }
            alert(data.message);
        } else {
            alert('Failed to scrape layouts');
        }
    } catch (error) {
        console.error('Error scraping layouts:', error);
        alert('Error scraping layouts');
    } finally {
        if (btn) btn.classList.remove('spinning');
    }
}

// ── Tjing search ───────────────────────────────────
async function searchTjing() {
    var input = document.getElementById('tjing-search-input');
    var btn = document.getElementById('tjing-search-btn');
    var container = document.getElementById('tjing-results');
    if (!input || !container) return;

    var q = input.value.trim();
    if (!q) return;

    btn.disabled = true;

    // Clear previous results safely
    while (container.firstChild) {
        container.removeChild(container.firstChild);
    }

    try {
        var response = await fetch('/api/tjing/search?q=' + encodeURIComponent(q));
        var data;
        try {
            data = await response.json();
        } catch (e) {
            var errP = document.createElement('p');
            errP.className = 'tjing-error';
            errP.textContent = 'Invalid response from server.';
            container.appendChild(errP);
            return;
        }

        if (!response.ok || data.error) {
            var errP2 = document.createElement('p');
            errP2.className = 'tjing-error';
            errP2.textContent = 'Error: ' + (data.error || 'Search failed');
            container.appendChild(errP2);
            return;
        }

        var results = data.results || [];
        if (results.length === 0) {
            var noResults = document.createElement('p');
            noResults.className = 'tjing-error';
            noResults.textContent = 'No courses found on Tjing.';
            container.appendChild(noResults);
            return;
        }

        results.forEach(function(course) {
            var item = document.createElement('div');
            item.className = 'tjing-result';

            var info = document.createElement('div');
            info.className = 'tjing-result-info';

            var nameSpan = document.createElement('span');
            nameSpan.className = 'tjing-result-name';
            nameSpan.textContent = course.name || '';

            var addrSpan = document.createElement('span');
            addrSpan.className = 'tjing-result-address';
            addrSpan.textContent = course.address || '';

            info.appendChild(nameSpan);
            info.appendChild(addrSpan);

            var importBtn = document.createElement('button');
            importBtn.className = 'btn-pill';
            importBtn.textContent = 'Import';
            (function(id, b) {
                b.addEventListener('click', function() { importFromTjing(id, b); });
            })(course.id, importBtn);

            item.appendChild(info);
            item.appendChild(importBtn);
            container.appendChild(item);
        });
    } catch (error) {
        console.error('Error searching Tjing:', error);
        var errFallback = document.createElement('p');
        errFallback.className = 'tjing-error';
        errFallback.textContent = 'Failed to search Tjing.';
        container.appendChild(errFallback);
    } finally {
        btn.disabled = false;
    }
}

// ── Tjing import ───────────────────────────────────
async function importFromTjing(tjingId, btn) {
    btn.disabled = true;
    btn.textContent = 'Importing…';

    try {
        var response = await fetch('/api/tjing/import/' + encodeURIComponent(tjingId), { method: 'POST' });
        var data;
        try {
            data = await response.json();
        } catch (e) {
            btn.textContent = 'Error';
            btn.disabled = false;
            return;
        }

        if (!response.ok || data.error) {
            btn.textContent = 'Error: ' + (data.error || 'Import failed');
            btn.disabled = false;
            return;
        }

        btn.textContent = 'Imported ✓';
        // Trigger table reload
        htmx.trigger(document.body, 'refresh');
    } catch (error) {
        console.error('Error importing from Tjing:', error);
        btn.textContent = 'Failed';
        btn.disabled = false;
    }
}

// ── Init ───────────────────────────────────────────
function initAll() {
    initCourseTabs();
    initCourseLiveFilter();
    initCourseCounts();
}

document.addEventListener('DOMContentLoaded', initAll);

document.addEventListener('htmx:afterSwap', function(evt) {
    if (evt.detail && evt.detail.target && evt.detail.target.id === 'course-table-region') {
        initCourseLiveFilter();
        initCourseCounts();
    }
});