/**
 * Document templates: `createBlankDocument()` (Datei › Neu, and what a first
 * start opens) and `createSeedDocument()` (Datei › Muster).
 *
 * The pre-filled document ("roter Faden" of the study), in the v2 canvas model:
 * one sheet ("Analyse") carrying three table objects and a chart object, plus a
 * second empty sheet to try things out.
 *
 * Note on the brief: the acceptance list mentions "Übersicht!B2 = 6070" as the
 * yearly Nord revenue, but the given Nord row is 1200 + 1450 + 1600 + 1720 =
 * 5970. The explicit table wins -- the exact number is deterministic and the
 * propagation behaviour it demonstrates is unchanged.
 */

import { parseA1 } from '../engine';
import type { ChartObject, DocumentState, TableObject } from '../store/types';
import { defaultTableView } from '../store/types';

let uid = 0;
const nextId = (p: string) => `${p}-seed-${(uid++).toString(36)}`;

function makeTable(
  name: string,
  x: number,
  y: number,
  rows: number,
  cols: number,
  entries: Array<[string, string | number]>,
  colWidths: Record<number, number> = {},
  viewOverride: Partial<TableObject['view']> = {},
): TableObject {
  const cells: Record<string, string> = {};
  for (const [a1, value] of entries) {
    const { col, row } = parseA1(a1);
    cells[`${col},${row}`] = String(value);
  }
  return {
    kind: 'table',
    id: nextId('tbl'),
    name,
    x,
    y,
    rows,
    cols,
    colWidths,
    cells,
    view: { ...defaultTableView(), ...viewOverride },
  };
}

export function createSeedDocument(): DocumentState {
  const umsatz = makeTable('Umsatz', 40, 40, 20, 8, [
    ['A1', 'Region'], ['B1', 'Q1'], ['C1', 'Q2'], ['D1', 'Q3'], ['E1', 'Q4'],
    ['A2', 'Nord'], ['B2', 1200], ['C2', 1450], ['D2', 1600], ['E2', 1720],
    ['A3', 'Süd'], ['B3', 980], ['C3', 1100], ['D3', 1250], ['E3', 1310],
    ['A4', 'Ost'], ['B4', 1550], ['C4', 1480], ['D4', 1620], ['E4', 1700],
    ['A5', 'West'], ['B5', 1340], ['C5', 1390], ['D5', 1500], ['E5', 1580],
    ['A6', 'Zentral'], ['B6', 1105], ['C6', 1205], ['D6', 1298], ['E6', 1402],
    ['A8', 'Summe'],
    ['B8', '=SUM(B2:B6)'], ['C8', '=SUM(C2:C6)'], ['D8', '=SUM(D2:D6)'], ['E8', '=SUM(E2:E6)'],
    ['A9', 'Mittelwert'],
    ['B9', '=AVG(B2:B6)'], ['C9', '=AVG(C2:C6)'], ['D9', '=AVG(D2:D6)'], ['E9', '=AVG(E2:E6)'],
    ['A10', 'Minimum'],
    ['B10', '=MIN(B2:B6)'], ['C10', '=MIN(C2:C6)'], ['D10', '=MIN(D2:D6)'], ['E10', '=MIN(E2:E6)'],
    ['A11', 'Maximum'],
    ['B11', '=MAX(B2:B6)'], ['C11', '=MAX(C2:C6)'], ['D11', '=MAX(D2:D6)'], ['E11', '=MAX(E2:E6)'],
    ['A12', 'Anzahl'],
    ['B12', '=COUNT(B2:B6)'], ['C12', '=COUNT(C2:C6)'], ['D12', '=COUNT(D2:D6)'], ['E12', '=COUNT(E2:E6)'],
    ['G2', 'Jahr Nord'], ['H2', '=SUM(B2:E2)'],
    ['G3', 'Schnitt/Q'], ['H3', '=SUM(B2:E2)/4'],
    ['G4', 'Delta Q4-Q1'], ['H4', '=E2-B2'],
  ], { 0: 92, 6: 96 }, { mode: 'fixed', width: 545, height: 360, frozenRows: 1, frozenCols: 1 });

  const kosten = makeTable('Kosten', 40, 700, 12, 8, [
    ['A1', 'Region'], ['B1', 'Q1'], ['C1', 'Q2'], ['D1', 'Q3'], ['E1', 'Q4'],
    ['A2', 'Nord'], ['B2', 800], ['C2', 820], ['D2', 900], ['E2', 880],
    ['A3', 'Süd'], ['B3', 700], ['C3', 690], ['D3', 710], ['E3', 720],
    ['A4', 'Ost'], ['B4', 900], ['C4', 910], ['D4', 950], ['E4', 980],
    ['A5', 'West'], ['B5', 760], ['C5', 770], ['D5', 780], ['E5', 790],
    ['A6', 'Zentral'], ['B6', 640], ['C6', 650], ['D6', 660], ['E6', 670],
  ], { 0: 92 });

  const regions = ['Nord', 'Süd', 'Ost', 'West', 'Zentral'];
  const overview: Array<[string, string | number]> = [
    ['A1', 'Region'], ['B1', 'Umsatz Jahr'], ['C1', 'Kosten Jahr'],
    ['D1', 'Deckungsbeitrag'], ['E1', 'Marge %'],
  ];
  regions.forEach((region, i) => {
    const r = i + 2;
    overview.push(
      [`A${r}`, region],
      [`B${r}`, `=SUM(Umsatz!B${r}:E${r})`],
      [`C${r}`, `=SUM(Kosten!B${r}:E${r})`],
      [`D${r}`, `=B${r}-C${r}`],
      [`E${r}`, `=D${r}/B${r}*100`],
    );
  });
  overview.push(
    ['A8', 'Gesamt'],
    ['B8', '=SUM(B2:B6)'], ['C8', '=SUM(C2:C6)'],
    ['D8', '=SUM(D2:D6)'], ['E8', '=AVG(E2:E6)'],
  );
  const uebersicht = makeTable('Übersicht', 1000, 40, 12, 6, overview, {
    0: 84, 3: 118,
  });

  const chart: ChartObject = {
    kind: 'chart',
    id: nextId('cht'),
    name: 'Umsatz je Region',
    x: 1000,
    y: 460,
    width: 560,
    height: 340,
    view: 'bar',
    sourceTableId: umsatz.id,
  };

  const analyse = {
    id: nextId('sheet'),
    name: 'Analyse',
    objects: [umsatz, kosten, uebersicht, chart],
  };
  // second sheet demos the per-sheet backdrop colour + hidden grid
  const blatt2 = {
    id: nextId('sheet'),
    name: 'Blatt 2',
    objects: [],
    background: '#f4f1ff',
    showGrid: false,
  };

  return {
    version: 2,
    sheets: [analyse, blatt2],
    activeSheetId: analyse.id,
    activeObjectId: umsatz.id,
    selection: { tableId: umsatz.id, anchor: { col: 0, row: 0 }, focus: { col: 0, row: 0 } },
    locale: 'de-DE',
    csvDelimiter: ',',
    customFunctions: [],
    namedRanges: [
      // demos "🏷 Namen": =Umsatz_Q1 anywhere resolves to Umsatz!B2:B6, even
      // from a different sheet, without a table qualifier.
      { id: nextId('nr'), name: 'Umsatz_Q1', tableId: umsatz.id, start: { col: 1, row: 1 }, end: { col: 1, row: 5 } },
    ],
    macros: [],
  };
}

/** An empty document: one sheet with one empty table, ready to type into. */
export function createBlankDocument(): DocumentState {
  const table = makeTable('Tabelle 1', 40, 40, 12, 6, []);
  const sheet = { id: nextId('sheet'), name: 'Blatt 1', objects: [table] };
  return {
    version: 2,
    sheets: [sheet],
    activeSheetId: sheet.id,
    activeObjectId: table.id,
    selection: { tableId: table.id, anchor: { col: 0, row: 0 }, focus: { col: 0, row: 0 } },
    locale: 'de-DE',
    csvDelimiter: ',',
    customFunctions: [],
    namedRanges: [],
    macros: [],
  };
}