/* ── dashboard app JS ──────────────────────────────────────────────── */

document.addEventListener('DOMContentLoaded', () => {
  // Confirm delete buttons
  document.querySelectorAll('[data-confirm]').forEach(el => {
    el.addEventListener('click', (e) => {
      if (!confirm(el.dataset.confirm || 'Are you sure?')) {
        e.preventDefault();
      }
    });
  });

  // ── person form: assemble ISO datetime on submit ──────────────────
  const form = document.getElementById('person-form');
  if (form) {
    form.addEventListener('submit', (e) => {
      const date = document.getElementById('birth_date').value;
      const time = document.getElementById('birth_time').value;
      const tz = document.getElementById('tz').value;
      if (!date || !time || !tz) {
        e.preventDefault();
        alert('Birth date, time, and timezone are required.');
        return;
      }
      // Build ISO string with timezone offset
      const offset = getTzOffsetMinutes(tz, date, time);
      const sign = offset >= 0 ? '+' : '-';
      const abs = Math.abs(offset);
      const oh = String(Math.floor(abs / 60)).padStart(2, '0');
      const om = String(abs % 60).padStart(2, '0');
      const iso = `${date}T${time}${sign}${oh}:${om}`;
      // Add a hidden field with the assembled datetime
      let hidden = document.getElementById('birth_datetime_assembled');
      if (!hidden) {
        hidden = document.createElement('input');
        hidden.type = 'hidden';
        hidden.id = 'birth_datetime_assembled';
        hidden.name = 'birth_datetime';
        form.appendChild(hidden);
      }
      hidden.value = iso;
    });
  }

  // ── UTC offset display ─────────────────────────────────────────────
  const tzSelect = document.getElementById('tz');
  const dateInput = document.getElementById('birth_date');
  const timeInput = document.getElementById('birth_time');
  const offsetDisplay = document.getElementById('utc-offset-display');

  function updateOffsetDisplay() {
    const tz = tzSelect.value;
    const date = dateInput.value;
    const time = timeInput.value;
    if (!tz || !date || !time) {
      offsetDisplay.textContent = '';
      return;
    }
    const offset = getTzOffsetMinutes(tz, date, time);
    const sign = offset >= 0 ? '+' : '-';
    const abs = Math.abs(offset);
    const oh = String(Math.floor(abs / 60)).padStart(2, '0');
    const om = String(abs % 60).padStart(2, '0');
    const tzAbbr = getTzAbbreviation(tz, date);
    offsetDisplay.textContent = `UTC${sign}${oh}:${om} (${tzAbbr})`;
    offsetDisplay.style.color = '#3fb950';
  }

  if (tzSelect && dateInput && timeInput) {
    tzSelect.addEventListener('change', updateOffsetDisplay);
    dateInput.addEventListener('input', updateOffsetDisplay);
    timeInput.addEventListener('input', updateOffsetDisplay);
    // Initial display if values are pre-filled
    updateOffsetDisplay();
  }

  // ── GeoNames autocomplete for birthplace ───────────────────────────
  const bpInput = document.getElementById('birthplace');
  const bpResults = document.getElementById('birthplace-results');
  const bpStatus = document.getElementById('birthplace-status');
  let debounceTimer = null;
  let activeIndex = -1;

  if (bpInput && bpResults) {
    bpInput.addEventListener('input', () => {
      clearTimeout(debounceTimer);
      const q = bpInput.value.trim();
      if (q.length < 2) {
        bpResults.style.display = 'none';
        bpStatus.textContent = '';
        return;
      }
      bpStatus.textContent = 'Searching...';
      debounceTimer = setTimeout(() => searchGeoNames(q), 300);
    });

    bpInput.addEventListener('keydown', (e) => {
      const items = bpResults.querySelectorAll('.autocomplete-item');
      if (!items.length) return;
      if (e.key === 'ArrowDown') {
        e.preventDefault();
        activeIndex = Math.min(activeIndex + 1, items.length - 1);
        updateActive(items);
      } else if (e.key === 'ArrowUp') {
        e.preventDefault();
        activeIndex = Math.max(activeIndex - 1, 0);
        updateActive(items);
      } else if (e.key === 'Enter') {
        e.preventDefault();
        if (activeIndex >= 0 && items[activeIndex]) {
          items[activeIndex].click();
        }
      } else if (e.key === 'Escape') {
        bpResults.style.display = 'none';
        activeIndex = -1;
      }
    });

    // Close dropdown on outside click
    document.addEventListener('click', (e) => {
      if (!bpInput.contains(e.target) && !bpResults.contains(e.target)) {
        bpResults.style.display = 'none';
      }
    });
  }

  function updateActive(items) {
    items.forEach((item, i) => {
      item.classList.toggle('active', i === activeIndex);
    });
  }

  async function searchGeoNames(q) {
    try {
      const resp = await fetch(`/api/geonames/search?q=${encodeURIComponent(q)}`);
      const results = await resp.json();
      if (!results.length) {
        bpStatus.textContent = 'No results found.';
        bpResults.style.display = 'none';
        return;
      }
      bpStatus.textContent = '';
      activeIndex = -1;
      bpResults.innerHTML = '';
      results.forEach((r, i) => {
        const div = document.createElement('div');
        div.className = 'autocomplete-item';
        const parts = [r.name, r.admin1, r.country].filter(Boolean);
        const main = parts[0];
        const sub = parts.slice(1).join(', ');
        const elev = r.elevation ? ` ${r.elevation}m` : '';
        div.innerHTML = `
          <span class="ac-main">${esc(main)}</span>
          <span class="ac-sub"> — ${esc(sub)}${esc(elev)}</span>
          <span class="ac-coords">${r.lat.toFixed(2)}, ${r.lng.toFixed(2)}</span>
        `;
        div.addEventListener('click', () => selectPlace(r));
        bpResults.appendChild(div);
      });
      bpResults.style.display = 'block';
    } catch (err) {
      bpStatus.textContent = 'Search failed.';
      bpResults.style.display = 'none';
    }
  }

  function selectPlace(r) {
    bpInput.value = [r.name, r.admin1, r.country].filter(Boolean).join(', ');
    document.getElementById('latitude').value = r.lat;
    document.getElementById('longitude').value = r.lng;
    if (r.elevation) {
      document.getElementById('elevation').value = r.elevation;
    }
    if (r.timezone) {
      const tzSel = document.getElementById('tz');
      // Check if the timezone exists in our select
      let found = false;
      for (const opt of tzSel.options) {
        if (opt.value === r.timezone) {
          tzSel.value = r.timezone;
          found = true;
          break;
        }
      }
      if (!found) {
        // Add it as a new option
        const opt = document.createElement('option');
        opt.value = r.timezone;
        opt.textContent = `${r.timezone} (auto-detected)`;
        tzSel.appendChild(opt);
        tzSel.value = r.timezone;
      }
      updateOffsetDisplay();
    }
    bpResults.style.display = 'none';
    bpStatus.textContent = `✓ ${r.timezone ? 'Timezone auto-filled' : 'Coordinates filled'}`;
    bpStatus.style.color = '#3fb950';
  }

  // ── helpers ─────────────────────────────────────────────────────────

  function getTzOffsetMinutes(tz, date, time) {
    try {
      const dt = new Date(`${date}T${time}:00`);
      // Use Intl to get the offset for the specific timezone
      const formatter = new Intl.DateTimeFormat('en-US', {
        timeZone: tz,
        year: 'numeric', month: '2-digit', day: '2-digit',
        hour: '2-digit', minute: '2-digit', second: '2-digit',
        hour12: false,
      });
      const parts = formatter.formatToParts(dt);
      const p = {};
      parts.forEach(part => { p[part.type] = part.value; });
      const local = new Date(`${p.year}-${p.month}-${p.day}T${p.hour}:${p.second}:00`);
      return Math.round((local - dt) / 60000);
    } catch (e) {
      return 0;
    }
  }

  function getTzAbbreviation(tz, date) {
    try {
      const dt = new Date(`${date}T12:00:00`);
      const formatter = new Intl.DateTimeFormat('en-US', {
        timeZone: tz,
        timeZoneName: 'short',
      });
      const parts = formatter.formatToParts(dt);
      const tzPart = parts.find(p => p.type === 'timeZoneName');
      return tzPart ? tzPart.value : tz;
    } catch (e) {
      return tz;
    }
  }

  function esc(str) {
    const d = document.createElement('div');
    d.textContent = str;
    return d.innerHTML;
  }
});