// Appearance settings: per-status bar colours, row/bar sizing, font sizes.
// Persisted in localStorage; applied via CSS variables + per-item inline styles.

export interface Appearance {
  /** Colour per task_status (hex #rrggbb). Unknown statuses fall back to defaultColor. */
  colors: Record<string, string>;
  /** Colour for bars flagged as a date-collision (overrides the status colour). */
  collisionColor: string;
  /** Fallback colour for statuses without an explicit entry. */
  defaultColor: string;
  /** Height of a board row (container), in pixels. */
  rowHeightPx: number;
  /** Bar height as a percentage of the row height. */
  barHeightPct: number;
  /** Font size of the text inside bars, in pixels. */
  barFontPx: number;
  /** Font size of the address/code column (first column), in pixels. */
  labelFontPx: number;
}

const LS_KEY = 'mapdash.appearance.v1';

/** Sensible out-of-the-box colours for the known statuses (lifecycle order). */
export const DEFAULT_STATUS_COLORS: Record<string, string> = {
  'РК. Новая': '#4f46e5',
  'РК. Предварительное бронирование': '#4f46e5',
  'РК. Макет РИМ согласован': '#4f46e5',
  'РК. Размещено': '#4f46e5',
  'РК. Ожидает монтаж': '#4f46e5',
  'РК. Ожидает демонтаж': '#4f46e5',
  'РК. Ожидает перемонтаж': '#4f46e5',
  'РК. Архив': '#4f46e5',
};

/** Display name for a status: strip the systemic "РК. " prefix. */
export function statusLabel(status: string): string {
  return status.replace(/^РК\.\s+/, '');
}

export function defaultAppearance(): Appearance {
  return {
    colors: { ...DEFAULT_STATUS_COLORS },
    collisionColor: '#e8590c',
    defaultColor: '#4f46e5',
    rowHeightPx: 30,
    barHeightPct: 62,
    barFontPx: 11,
    labelFontPx: 12,
  };
}

export function loadAppearance(): Appearance {
  const base = defaultAppearance();
  try {
    const raw = localStorage.getItem(LS_KEY);
    if (!raw) return base;
    const saved = JSON.parse(raw) as Partial<Appearance>;
    return {
      ...base,
      ...saved,
      colors: { ...base.colors, ...(saved.colors ?? {}) },
    };
  } catch {
    return base;
  }
}

export function saveAppearance(a: Appearance): void {
  try {
    localStorage.setItem(LS_KEY, JSON.stringify(a));
  } catch {
    /* storage unavailable — settings simply won't persist */
  }
}

export function barHeightPx(a: Appearance): number {
  return Math.max(1, Math.round((a.rowHeightPx * a.barHeightPct) / 100));
}

/** Symmetric top/bottom gap that centres the bar and yields rowHeightPx total. */
export function marginVertical(a: Appearance): number {
  return Math.max(0, Math.round((a.rowHeightPx - barHeightPx(a)) / 2));
}

export function colorForStatus(a: Appearance, status: string): string {
  return a.colors[status] || a.defaultColor;
}

/** Push size/font settings into CSS custom properties on :root. */
export function applyCssVars(a: Appearance): void {
  const root = document.documentElement.style;
  root.setProperty('--row-h', a.rowHeightPx + 'px');
  root.setProperty('--bar-h', barHeightPx(a) + 'px');
  root.setProperty('--bar-font', a.barFontPx + 'px');
  root.setProperty('--label-font', a.labelFontPx + 'px');
}

// ---- settings menu UI ----------------------------------------------------

function numberRow(labelText: string, value: number, min: number, max: number, onInput: (v: number) => void): HTMLElement {
  const row = document.createElement('label');
  row.className = 'decor-row';
  const span = document.createElement('span');
  span.textContent = labelText;
  const input = document.createElement('input');
  input.type = 'number';
  input.min = String(min);
  input.max = String(max);
  input.value = String(value);
  input.addEventListener('input', () => {
    const v = parseInt(input.value, 10);
    if (!Number.isNaN(v)) onInput(Math.max(min, Math.min(max, v)));
  });
  row.appendChild(span);
  row.appendChild(input);
  return row;
}

function colorRow(labelText: string, value: string, onInput: (v: string) => void): HTMLElement {
  const row = document.createElement('label');
  row.className = 'decor-row';
  const span = document.createElement('span');
  span.textContent = labelText;
  const input = document.createElement('input');
  input.type = 'color';
  input.value = value;
  input.addEventListener('input', () => onInput(input.value));
  row.appendChild(span);
  row.appendChild(input);
  return row;
}

// Circular two-arrows "reset" glyph (Feather refresh-cw).
const RESET_ICON =
  '<svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M23 4v6h-6"/><path d="M1 20v-6h6"/><path d="M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15"/></svg>';

/**
 * A status colour row: clean status name, a grey reset glyph that restores this
 * status's default colour, then the colour picker.
 */
function statusColorRow(status: string, value: string, defColor: string, onInput: (v: string) => void): HTMLElement {
  const row = document.createElement('div');
  row.className = 'decor-row';
  const span = document.createElement('span');
  span.textContent = statusLabel(status);
  const wrap = document.createElement('div');
  wrap.className = 'decor-color-wrap';
  const reset = document.createElement('button');
  reset.type = 'button';
  reset.className = 'decor-color-reset';
  reset.title = 'Сбросить цвет статуса';
  reset.setAttribute('aria-label', 'Сбросить цвет статуса');
  reset.innerHTML = RESET_ICON;
  const input = document.createElement('input');
  input.type = 'color';
  input.value = value;
  input.addEventListener('input', () => onInput(input.value));
  reset.addEventListener('click', (e) => {
    e.preventDefault();
    e.stopPropagation();
    input.value = defColor;
    onInput(defColor);
  });
  wrap.appendChild(reset);
  wrap.appendChild(input);
  row.appendChild(span);
  row.appendChild(wrap);
  return row;
}

function section(title: string): HTMLElement {
  const s = document.createElement('div');
  s.className = 'decor-section';
  const h = document.createElement('div');
  h.className = 'decor-section-title';
  h.textContent = title;
  s.appendChild(h);
  return s;
}

/**
 * (Re)build the appearance menu contents into `panel`.
 * `statuses` — union of statuses to expose colour pickers for.
 * `onChange` — called after every edit (already persisted).
 */
export function buildAppearanceMenu(
  panel: HTMLElement,
  statuses: string[],
  a: Appearance,
  onChange: () => void,
): void {
  panel.innerHTML = '';

  // 1) Colours
  const colours = section('Цвета баров');
  const known = Object.keys(DEFAULT_STATUS_COLORS);
  const all = Array.from(new Set([...known, ...statuses]));
  for (const st of all) {
    colours.appendChild(
      statusColorRow(st, colorForStatus(a, st), DEFAULT_STATUS_COLORS[st] || a.defaultColor, (v) => {
        a.colors[st] = v;
        saveAppearance(a);
        onChange();
      }),
    );
  }
  colours.appendChild(
    colorRow('Коллизия', a.collisionColor, (v) => {
      a.collisionColor = v;
      saveAppearance(a);
      onChange();
    }),
  );
  panel.appendChild(colours);

  // 2) Sizes
  const sizes = section('Размеры строк и баров');
  sizes.appendChild(
    numberRow('Высота строки, px', a.rowHeightPx, 8, 120, (v) => {
      a.rowHeightPx = v;
      saveAppearance(a);
      onChange();
    }),
  );
  sizes.appendChild(
    numberRow('Высота бара, % от строки', a.barHeightPct, 10, 100, (v) => {
      a.barHeightPct = v;
      saveAppearance(a);
      onChange();
    }),
  );
  panel.appendChild(sizes);

  // 3) Fonts
  const fonts = section('Размер шрифта');
  fonts.appendChild(
    numberRow('В барах, px', a.barFontPx, 6, 32, (v) => {
      a.barFontPx = v;
      saveAppearance(a);
      onChange();
    }),
  );
  fonts.appendChild(
    numberRow('В колонке адресов, px', a.labelFontPx, 6, 32, (v) => {
      a.labelFontPx = v;
      saveAppearance(a);
      onChange();
    }),
  );
  panel.appendChild(fonts);

  // Reset
  const reset = document.createElement('button');
  reset.type = 'button';
  reset.className = 'decor-reset';
  reset.textContent = 'Сбросить к значениям по умолчанию';
  reset.addEventListener('click', () => {
    const d = defaultAppearance();
    Object.assign(a, d);
    a.colors = { ...d.colors };
    saveAppearance(a);
    buildAppearanceMenu(panel, statuses, a, onChange);
    onChange();
  });
  panel.appendChild(reset);
}