// ==UserScript==
// @name         UBW Requisition Filler
// @namespace    unit4.ubw.requisitions
// @version      1.0
// @description  Fill a UBW purchase requisition's line items from a supplier cart CSV. Fills only; never saves or submits.
// @match        https://ubw.unit4cloud.com/*
// @run-at       document-idle
// @grant        GM_registerMenuCommand
// @grant        unsafeWindow
// ==/UserScript==
//
// Install, usage and CSV format: see README.md. The comments below are the design notes: why the
// script does things the way it does, for anyone maintaining it.

(function () {
  'use strict';

  // Any @grant puts us in Tampermonkey's sandbox, whose window lacks the page's Ext; reach the real
  // page window (and its event constructors) via unsafeWindow. Falls back to window in the console.
  const win = (typeof unsafeWindow !== 'undefined') ? unsafeWindow : window;

  const DEFAULTS = {
    productCode: '',
    requestName: 'Order ' + new Date().toISOString().slice(0, 10),
  };

  // ---- Small async helpers ------------------------------------------------------------------
  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

  // "Server is done" = no outstanding Ext Ajax. Don't watch for .x-mask nodes; UBW keeps permanent ones.
  async function waitIdle(timeout = 20000) {
    const t0 = Date.now();
    await sleep(120);
    while (Date.now() - t0 < timeout) {
      if (!win.Ext.Ajax.isLoading()) {
        await sleep(120);
        if (!win.Ext.Ajax.isLoading()) return true;
      }
      await sleep(100);
    }
    return false;
  }

  const visByName = (name, label) =>
    win.Ext.ComponentQuery.query('[name="' + name + '"]').filter(
      (c) => c.isVisible && c.isVisible() && (label === undefined || c.fieldLabel === label)
    )[0];

  const detailsGrid = () => win.Ext.ComponentQuery.query('abw_requisitions_detailsgridview')[0];

  // Fire the full press/release sequence, not a bare .click(): ExtJS copies the header supplier onto
  // a new "Add product" row on mousedown, so a lone click adds the row with Supplier left blank.
  const clickButton = (btn) => {
    if (!btn) return false;
    const el = btn.el.dom.querySelector('a,span') || btn.el.dom;
    // Page-world event constructors, to match the DOM they are dispatched onto.
    const opts = { bubbles: true, cancelable: true, view: win, button: 0 };
    const fire = (Ctor, type) => { try { el.dispatchEvent(new win[Ctor](type, opts)); } catch (e) {} };
    fire('PointerEvent', 'pointerover');
    fire('MouseEvent', 'mouseover');
    fire('PointerEvent', 'pointerdown');
    fire('MouseEvent', 'mousedown');
    fire('PointerEvent', 'pointerup');
    fire('MouseEvent', 'mouseup');
    el.click();
    return true;
  };

  const actionButton = (text) =>
    win.Ext.ComponentQuery.query('u4_actionbutton').find((b) => b.text === text);

  // Resolve a remote-lookup field to an exact code. setValue sets only the display, not the record,
  // so run the field's own query and select the exact match, firing the 'select' that commits it.
  async function resolveCombo(field, code) {
    if (!field) return { ok: false, err: 'field not found' };
    field.focus();
    if (typeof field.doQuery === 'function') {
      field.doQuery(String(code), true, true);
      await waitIdle();
      await sleep(250);
      let match = null;
      field.getStore().each((r) => {
        if (String(r.get(field.valueField)) === String(code)) {
          match = r;
          return false;
        }
      });
      if (!match) return { ok: false, err: 'no exact match for ' + code, count: field.getStore().getCount() };
      field.select(match);
      try { field.fireEvent('select', field, [match]); } catch (e) {}
      await waitIdle();
      await sleep(200);
      if (field.isExpanded) field.collapse();
    } else {
      field.setValue(String(code));
      await waitIdle();
    }
    return { ok: field.isValid ? field.isValid() : true, value: field.getValue && field.getValue() };
  }

  // ---- Form operations ----------------------------------------------------------------------
  // Supplier and budget live in the Header (set by hand); each line inherits the supplier from it.
  // The script fills only the request name and the line grid.
  function setRequestName(cfg) {
    const nameF = win.Ext.ComponentQuery.query('[name="requisitionName"]')[0];
    if (nameF && cfg.requestName) nameF.setValue(cfg.requestName);
  }

  async function addLine(cfg, line, log) {
    const grid = detailsGrid();
    const store = grid.getStore();
    const ce = grid.editingPlugin;
    const before = store.getCount();

    if (!clickButton(actionButton('Add product'))) throw new Error('Add product button not found');
    await waitIdle();
    await sleep(400);
    const rec = store.getAt(store.getCount() - 1);
    if (store.getCount() !== before + 1) return { ok: false, err: 'row not added' };

    if (!ce.editing) {
      const col = grid.getColumnManager().getColumns().filter((c) => c.dataIndex === 'article')[0];
      ce.startEdit(rec, col);
      await sleep(300);
    }

    // The product code populates the default account/tax/sub-project. Use this line's own code if
    // the CSV gave one, otherwise the panel default.
    const productCode = line.productCode || cfg.productCode;
    const artR = await resolveCombo(visByName('article'), productCode);
    if (!artR.ok) return { ok: false, err: 'product code ' + productCode + ': ' + artR.err };
    await sleep(200);

    visByName('articleDescription').setValue(line.description);
    visByName('quantity').setValue(line.qty);
    visByName('unitPrice').setValue(line.price);
    await sleep(150);
    ce.completeEdit();
    await waitIdle();
    await sleep(400);

    if (!rec.get('supplierId')) log('  WARNING: supplier blank on this line');

    // Set the line amount so the on-screen total is right for review; the server recomputes
    // amounts, tax and the header total authoritatively on Save/Send.
    rec.beginEdit();
    rec.set('amount', line.qty * line.price);
    rec.set('currencyAmount', line.qty * line.price);
    rec.set('amountSet', true);
    rec.endEdit();
    try { grid.setTotalAmount(); } catch (e) {}

    return {
      ok: true,
      valid: rec.isValid && rec.isValid(),
      supplier: rec.get('supplierId'),
      account: rec.get('account'),
      amount: rec.get('amount'),
    };
  }

  async function fillOrder(cfg, lines, log) {
    if (!detailsGrid()) {
      log('ERROR: no requisition form on screen. Open Purchasing > Purchase request first.');
      return;
    }
    setRequestName(cfg);
    log('adding ' + lines.length + ' lines... (Header supplier/budget must already be set)');
    let total = 0;
    for (let i = 0; i < lines.length; i++) {
      const r = await addLine(cfg, lines[i], log);
      if (!r.ok) {
        log('ABORT at line ' + (i + 1) + ': ' + r.err);
        return;
      }
      total += lines[i].qty * lines[i].price;
      log('line ' + (i + 1) + '/' + lines.length + ' ' + lines[i].description.slice(0, 40) +
          ' -> ' + (r.valid ? 'valid' : 'INVALID'));
    }
    log('DONE. ' + lines.length + ' lines, computed total GBP ' + total.toFixed(2) + '.');
    log('Review every line, then Save as draft / Send for approval yourself.');
  }

  // ---- CSV parsing --------------------------------------------------------------------------
  // Minimal RFC-4180-ish parser: handles quoted fields, commas inside quotes and "" escapes.
  function parseCSV(text) {
    const rows = [];
    let row = [], field = '', inQuotes = false;
    for (let i = 0; i < text.length; i++) {
      const c = text[i];
      if (inQuotes) {
        if (c === '"') {
          if (text[i + 1] === '"') { field += '"'; i++; }
          else inQuotes = false;
        } else field += c;
      } else if (c === '"') inQuotes = true;
      else if (c === ',') { row.push(field); field = ''; }
      else if (c === '\r') { /* skip */ }
      else if (c === '\n') { row.push(field); rows.push(row); row = []; field = ''; }
      else field += c;
    }
    if (field.length || row.length) { row.push(field); rows.push(row); }
    return rows;
  }

  function linesFromCSV(text) {
    const rows = parseCSV(text).filter((r) => r.some((c) => c && c.trim() !== ''));
    if (!rows.length) throw new Error('empty CSV');
    const header = rows[0].map((h) => h.trim().toLowerCase());
    const col = (name) => header.indexOf(name);
    const iItem = col('item number'), iQty = col('quantity'),
          iDesc = col('description'), iPrice = col('unit price'), iProd = col('product');
    if (iItem < 0 || iQty < 0 || iDesc < 0 || iPrice < 0) {
      throw new Error('CSV must have columns: Item Number, Quantity, Description, Unit Price');
    }
    const money = (s) => parseFloat(String(s).replace(/[^0-9.\-]/g, ''));
    const lines = [];
    for (let r = 1; r < rows.length; r++) {
      const item = (rows[r][iItem] || '').trim();
      const qty = parseFloat(rows[r][iQty]);
      const price = money(rows[r][iPrice]);
      if (!item || !qty || isNaN(qty) || isNaN(price)) continue; // skip blanks / footer text
      lines.push({
        // Optional per-line product code; blank falls back to the panel default in addLine.
        productCode: iProd >= 0 ? (rows[r][iProd] || '').trim() : '',
        description: item + ' - ' + (rows[r][iDesc] || '').trim(),
        qty: qty,
        price: price,
      });
    }
    return lines;
  }

  // ---- Control panel UI ---------------------------------------------------------------------
  function buildPanel() {
    if (document.getElementById('ubw-filler-panel')) return;
    const wrap = document.createElement('div');
    wrap.id = 'ubw-filler-panel';
    wrap.style.cssText =
      'position:fixed;top:70px;right:16px;z-index:100000;width:300px;background:#fff;' +
      'border:1px solid #b7bcc2;border-radius:6px;box-shadow:0 4px 14px rgba(0,0,0,.18);' +
      'font:12px/1.4 Arial,sans-serif;color:#222;';
    const field = (label, id, value) =>
      '<label style="display:block;margin:6px 0 2px;font-weight:bold">' + label + '</label>' +
      '<input id="' + id + '" value="' + (value || '') + '" ' +
      'style="width:100%;box-sizing:border-box;padding:4px;border:1px solid #ccc;border-radius:3px">';
    wrap.innerHTML =
      '<div style="background:#f2f4f6;padding:8px 10px;font-weight:bold;border-bottom:1px solid #e0e0e0">' +
      'UBW Requisition Filler' +
      '<span id="ubw-close" style="float:right;cursor:pointer;color:#888">×</span></div>' +
      '<div style="padding:10px">' +
      field('Request name', 'ubw-name', DEFAULTS.requestName) +
      field('Default product code', 'ubw-prod', DEFAULTS.productCode) +
      '<label style="display:block;margin:6px 0 2px;font-weight:bold">Cart CSV</label>' +
      '<input type="file" id="ubw-file" accept=".csv,text/csv" style="width:100%">' +
      '<button id="ubw-fill" style="margin-top:10px;width:100%;padding:7px;border:0;border-radius:3px;' +
      'background:#1f6fbf;color:#fff;font-weight:bold;cursor:pointer">Fill requisition</button>' +
      '<div id="ubw-log" style="margin-top:8px;max-height:180px;overflow:auto;white-space:pre-wrap;' +
      'font:11px/1.35 monospace;color:#333;background:#f7f7f7;border:1px solid #eee;border-radius:3px;padding:6px">' +
      'Ready. Set the Header supplier/budget by hand, then pick a CSV and Fill.</div>' +
      '<div style="margin-top:6px;color:#a33;font-size:11px">Set the Header (supplier, budget) first. This does not Save or Submit.</div>' +
      '</div>';
    document.body.appendChild(wrap);

    const logEl = wrap.querySelector('#ubw-log');
    const log = (m) => { logEl.textContent += '\n' + m; logEl.scrollTop = logEl.scrollHeight; };

    wrap.querySelector('#ubw-close').onclick = () => wrap.remove();
    wrap.querySelector('#ubw-fill').onclick = () => {
      const fileInput = wrap.querySelector('#ubw-file');
      const cfg = {
        requestName: wrap.querySelector('#ubw-name').value.trim(),
        productCode: wrap.querySelector('#ubw-prod').value.trim(),
      };
      if (!fileInput.files.length) { log('Pick a CSV file first.'); return; }
      const reader = new FileReader();
      reader.onload = () => {
        let lines;
        try { lines = linesFromCSV(reader.result); }
        catch (e) { log('CSV error: ' + e.message); return; }
        logEl.textContent = 'Parsed ' + lines.length + ' lines from CSV.';
        wrap.querySelector('#ubw-fill').disabled = true;
        fillOrder(cfg, lines, log).finally(() => { wrap.querySelector('#ubw-fill').disabled = false; });
      };
      reader.readAsText(fileInput.files[0]);
    };
  }

  // UBW is a SPA, so the script boots once. A Tampermonkey menu command opens the panel on demand
  // (so you can navigate to Purchase request first). buildPanel() no-ops if shown, rebuilds after close.
  const showPanel = () => {
    if (win.Ext && win.Ext.ComponentQuery) buildPanel();
    else alert('UBW is still loading its UI. Wait a moment, then try again.');
  };
  if (typeof GM_registerMenuCommand === 'function') {
    GM_registerMenuCommand('Show UBW Requisition Filler', showPanel);
  } else {
    // Fallback (e.g. pasted into the DevTools console, where GM_* is unavailable): show at once.
    const boot = setInterval(() => {
      if (win.Ext && win.Ext.ComponentQuery) { clearInterval(boot); buildPanel(); }
    }, 800);
  }
})();