// Front-end for PDQ / vendor pages.
//
// Globals provided by the page via <script> before this file:
//   PDQ.actor      'ICG' or vendor slug
//   PDQ.audience   'ICG' or 'vendor'
//   PDQ.vendors    [{slug, name}, ...]   (ICG view only; vendor view: just its own)
//   PDQ.pollMs     ms between auto-refresh

(function () {
  if (typeof window.PDQ === 'undefined') window.PDQ = {};
  const PDQ = window.PDQ;

  const $ = (sel, root = document) => root.querySelector(sel);
  const $$ = (sel, root = document) => Array.from(root.querySelectorAll(sel));

  // Adds actor/vendor params to AJAX calls so the server can identify us.
  function authParams() {
    if (PDQ.audience === 'ICG') return { actor: 'ICG' };
    return { v: PDQ.actor };
  }

  function postForm(url, data) {
    const body = new URLSearchParams({ ...authParams(), ...data });
    return fetch(url, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body,
    });
  }

  function get(url, params = {}) {
    const u = new URL(url, window.location.href);
    Object.entries({ ...authParams(), ...params })
      .forEach(([k, v]) => u.searchParams.set(k, v));
    return fetch(u.toString());
  }

  // -------- jobs table --------

  function reloadTable() {
    return get('bin/jobs_table.php')
      .then(r => r.text())
      .then(html => {
        $('#jobs-table').innerHTML = html;
        wireTable();
        stampSyncTime();
      });
  }

  function stampSyncTime() {
    const d = new Date();
    const el = $('#sync-time');
    if (!el) return;
    el.textContent = 'Last sync: ' + d.toLocaleTimeString();
  }

  function wireTable() {
    $$('#jobs-table .btn[data-action]').forEach(btn => {
      btn.addEventListener('click', onAction);
    });
    $$('#jobs-table .editable').forEach(el => {
      el.addEventListener('dblclick', beginEdit);
      el.addEventListener('keydown', e => {
        if (e.key === 'Enter') { e.preventDefault(); beginEdit.call(el, e); }
      });
    });
  }

  function onAction(e) {
    const btn = e.currentTarget;
    const row = btn.closest('tr');
    const jobId = row.dataset.jobId;
    const action = btn.dataset.action;
    if (action === 'partial_ship') return onPartialShip(btn, row, jobId);

    btn.disabled = true;
    postForm('bin/jobs_update.php', { job_id: jobId, action })
      .then(r => r.text().then(t => ({ ok: r.ok, body: t })))
      .then(res => {
        if (!res.ok || res.body.trim() !== 'Success') {
          alert('Update failed: ' + res.body);
        }
        return reloadTable();
      })
      .catch(err => alert('Network error: ' + err.message));
  }

  function onPartialShip(btn, row, jobId) {
    const currentQty = parseInt(btn.dataset.qty, 10);
    const raw = window.prompt(
      'How many are shipping now?' + (currentQty ? ' (out of ' + currentQty + ')' : '')
    );
    if (raw === null) return;
    const partial = parseInt(String(raw).trim(), 10);
    if (!Number.isInteger(partial) || partial <= 0) {
      alert('Enter a whole number greater than zero.');
      return;
    }
    if (currentQty && partial >= currentQty) {
      alert('Partial quantity must be less than ' + currentQty + '. Use Mark Shipped to ship the whole job.');
      return;
    }
    btn.disabled = true;
    postForm('bin/jobs_partial_ship.php', { job_id: jobId, partial_qty: partial })
      .then(r => r.text().then(t => ({ ok: r.ok, body: t })))
      .then(res => {
        if (!res.ok || res.body.trim() !== 'Success') {
          alert('Partial ship failed: ' + res.body);
        }
        return reloadTable();
      })
      .catch(err => alert('Network error: ' + err.message));
  }

  function beginEdit(e) {
    const span = this;
    if (span.querySelector('input')) return;
    const col = span.dataset.column;
    const original = (span.dataset.raw !== undefined) ? span.dataset.raw : span.textContent.trim();
    const initial = original === '—' ? '' : original;

    const input = document.createElement('input');
    input.type = 'text';
    input.className = 'inline-edit';
    input.value = initial;
    span.innerHTML = '';
    span.appendChild(input);
    input.focus();
    input.select();

    let done = false;
    const commit = (save) => {
      if (done) return;
      done = true;
      const val = input.value;
      if (!save || val === initial) {
        renderValue(span, original, col);
        return;
      }
      span.classList.add('saving');
      const row = span.closest('tr');
      postForm('bin/jobs_update.php', {
        job_id: row.dataset.jobId,
        column: col,
        value: val,
      })
        .then(r => r.text().then(t => ({ ok: r.ok, body: t })))
        .then(res => {
          span.classList.remove('saving');
          if (!res.ok || res.body.trim() !== 'Success') {
            span.classList.add('error');
            alert('Save failed: ' + res.body);
            renderValue(span, original, col);
          } else {
            return reloadTable();
          }
        })
        .catch(err => {
          span.classList.remove('saving');
          span.classList.add('error');
          alert('Network error: ' + err.message);
          renderValue(span, original, col);
        });
    };

    input.addEventListener('blur', () => commit(true));
    input.addEventListener('keydown', ev => {
      if (ev.key === 'Enter')   { ev.preventDefault(); input.blur(); }
      if (ev.key === 'Escape')  { ev.preventDefault(); commit(false); }
    });
  }

  function renderValue(span, val, col) {
    if (col === 'due_date') span.dataset.raw = val;
    span.textContent = (val === '' || val === null) ? '—' : val;
  }

  // -------- messages --------

  function reloadAllThreads() {
    return Promise.all($$('.thread').map(reloadThread));
  }

  function reloadThread(thread) {
    const slug = thread.dataset.vendor;
    const list = thread.querySelector('.thread-list');
    const since = list.dataset.maxId || 0;
    return get('bin/messages_list.php', { vendor: slug, since })
      .then(r => r.text().then(html => ({
        html,
        maxId: r.headers.get('X-Max-Id') || since,
      })))
      .then(({ html, maxId }) => {
        if (html.trim()) {
          if (since === '0' || since === 0) list.innerHTML = '';
          list.insertAdjacentHTML('beforeend', html);
          list.scrollTop = list.scrollHeight;
        }
        list.dataset.maxId = maxId;
        const empty = list.querySelector('.msg-empty');
        if (empty && list.querySelector('.msg')) empty.remove();
      });
  }

  function wireCompose() {
    $$('.thread').forEach(thread => {
      const form = thread.querySelector('.thread-compose');
      if (!form) return;
      form.addEventListener('submit', e => {
        e.preventDefault();
        const input = form.querySelector('input[name=body]');
        const body = input.value.trim();
        if (!body) return;
        const slug = thread.dataset.vendor;
        input.disabled = true;
        postForm('bin/messages_post.php', { vendor: slug, body })
          .then(r => r.text().then(t => ({ ok: r.ok, body: t, maxId: r.headers.get('X-Msg-Id') })))
          .then(res => {
            input.disabled = false;
            if (!res.ok) { alert('Post failed: ' + res.body); return; }
            input.value = '';
            input.focus();
            const list = thread.querySelector('.thread-list');
            const empty = list.querySelector('.msg-empty');
            if (empty) empty.remove();
            list.insertAdjacentHTML('beforeend', res.body);
            list.dataset.maxId = res.maxId || list.dataset.maxId;
            list.scrollTop = list.scrollHeight;
          })
          .catch(err => {
            input.disabled = false;
            alert('Network error: ' + err.message);
          });
      });
    });
  }

  // -------- add job (ICG only) --------

  // While this is non-null, polling skips auto-reload so the in-progress
  // compose form isn't ripped out from under the user.
  let composeRowId = null;

  function wireAddJob() {
    const btn = $('#add-job');
    if (!btn) return;
    btn.addEventListener('click', () => {
      const select = $('#add-job-vendor');
      const vendor = select ? select.value : 'bill';
      postForm('bin/jobs_add.php', { vendor, ajax: '1' })
        .then(r => r.text().then(t => ({ ok: r.ok, body: t })))
        .then(res => {
          const newId = parseInt((res.body || '').trim(), 10);
          if (!res.ok || !Number.isInteger(newId) || newId <= 0) {
            alert('Add failed: ' + res.body);
            return;
          }
          return reloadTable().then(() => {
            const row = $('#jobs-table tr[data-job-id="' + newId + '"]');
            if (row) composeRow(row);
          });
        })
        .catch(err => alert('Network error: ' + err.message));
    });
  }

  // Open every editable cell of `rowEl` as an <input> simultaneously so the
  // user can Tab between them. Each input's initial value is captured; on
  // exit (Escape, Enter past the last cell, or focus leaving the row) only
  // the changed fields are saved in parallel, then the table reloads once.
  function composeRow(rowEl) {
    const jobId = parseInt(rowEl.dataset.jobId, 10);
    composeRowId = jobId;

    const cells = Array.from(rowEl.querySelectorAll('.editable'));
    const inputs = cells.map(span => {
      const col = span.dataset.column;
      const raw = span.dataset.raw !== undefined ? span.dataset.raw : span.textContent.trim();
      const initial = raw === '—' ? '' : raw;
      const input = document.createElement('input');
      input.type = 'text';
      input.className = 'inline-edit';
      input.value = initial;
      input.dataset.column = col;
      input.dataset.initial = initial;
      // The span owns tabindex=0 so it can be entered from the keyboard, but
      // while it hosts a live input we want Tab to jump straight to the input.
      span.setAttribute('tabindex', '-1');
      span.innerHTML = '';
      span.appendChild(input);
      return input;
    });

    inputs.forEach((input, i) => {
      input.addEventListener('keydown', e => {
        if (e.key === 'Escape') {
          e.preventDefault();
          finishCompose(rowEl, /*save=*/false);
        } else if (e.key === 'Enter') {
          e.preventDefault();
          if (i + 1 < inputs.length) {
            inputs[i + 1].focus();
            inputs[i + 1].select();
          } else {
            finishCompose(rowEl, true);
          }
        }
      });
    });

    // Detect focus genuinely leaving the row (not just hopping between its inputs).
    rowEl.addEventListener('focusout', () => {
      setTimeout(() => {
        if (composeRowId === jobId && !rowEl.contains(document.activeElement)) {
          finishCompose(rowEl, true);
        }
      }, 50);
    });

    if (inputs[0]) { inputs[0].focus(); inputs[0].select(); }
  }

  function finishCompose(rowEl, save) {
    if (composeRowId === null) return;
    const jobId = composeRowId;
    composeRowId = null;

    const inputs = Array.from(rowEl.querySelectorAll('input.inline-edit'));
    const dirty = save ? inputs.filter(i => i.value !== i.dataset.initial) : [];

    // Serialize the saves so they queue against the SQLite writer lock
    // politely instead of all racing at once.
    const failed = [];
    const runNext = (i) => {
      if (i >= dirty.length) return Promise.resolve();
      const input = dirty[i];
      return postForm('bin/jobs_update.php', {
        job_id: jobId,
        column: input.dataset.column,
        value: input.value,
      })
        .then(r => r.text().then(t => {
          if (!r.ok || t.trim() !== 'Success') {
            failed.push(input.dataset.column + ': ' + t);
          }
        }))
        .then(() => runNext(i + 1));
    };

    runNext(0)
      .then(() => {
        if (failed.length) alert('Some saves failed:\n' + failed.join('\n'));
        return reloadTable();
      })
      .catch(err => {
        alert('Network error: ' + err.message);
        reloadTable();
      });
  }

  // -------- polling --------

  function isUserBusy() {
    const a = document.activeElement;
    if (!a) return false;
    const tag = a.tagName;
    return tag === 'INPUT' || tag === 'TEXTAREA' || a.isContentEditable;
  }

  function tick() {
    if (isUserBusy()) return;
    reloadTable();
    reloadAllThreads();
  }

  document.addEventListener('DOMContentLoaded', () => {
    wireAddJob();
    wireCompose();
    reloadTable();
    reloadAllThreads();
    const interval = PDQ.pollMs || 60000;
    setInterval(tick, interval);
  });
})();