3 columns

import type { Section } from '../types';
import { Component } from './Component';
import { schema } from './schema';
import { meta } from './meta';
import { writeCopy } from './writeCopy';

export const layoutContainer: Section = { meta, schema, Component, writeCopy };

import { Children, Fragment, isValidElement, type ReactNode } from 'react';
import type { SectionProps } from '../types';
import { LayoutDropHint } from '@/components/site/LayoutDropHint';
import {
  layoutBlockColClasses,
  resolveLayoutBlockMode,
  CONTAINER_GAP_CLASS,
  CONTAINER_ALIGN_CLASS,
  CONTAINER_JUSTIFY_CLASS,
  CONTAINER_PHONE_ROW_CLASS,
  CONTAINER_PHONE_ROW_GAP,
  parseContainerPhone,
  layoutBlockClasses,
  type LayoutBlockMode,
} from '@/lib/patterns/blocks';
import { cn } from '@/lib/utils';

/**
 * Structural template only (no gap) — the node's own `gap` field is the single source of
 * the gap class (`CONTAINER_GAP_CLASS`), so this never reaches for `layoutBlockClasses`'s
 * built-in per-mode gap.
 */
/** A cluster inside a cover or centered band centres its row, as the band centres everything else. */
const CLUSTER_BAND_JUSTIFY =
  '[.site-compose-cover-card_&]:justify-center [.site-compose-cover-plain_&]:justify-center [.site-compose-centered_&]:justify-center';

/** A grid cell lets its column or card fill the row height, so cells share one height. */
const GRID_CELL_FILL = '[&>.site-nested-block]:flex [&>.site-nested-block]:flex-col';

/**
 * Zigzag alternation: a row (a `.site-nested-block` direct child, typically a nested
 * `split` layout-container) already lays its own two columns side by side from
 * `@cq-md/site:` up. Every even row keeps that same left-to-right DOM order but swaps
 * which side each column renders on, via `order` on the row's own two children —
 * the same order-first/order-last vocabulary `about/Component.tsx` uses for its
 * copy/media flip, just reached through the row wrapper instead of set on the leaf.
 */
const ZIGZAG_ROW_FLIP = cn(
  '[&>.site-nested-block:nth-child(even)>.site-layout-container>.site-nested-block:first-child]:@cq-md/site:order-last',
  '[&>.site-nested-block:nth-child(even)>.site-layout-container>.site-nested-block:last-child]:@cq-md/site:order-first',
);

function containerStructureClass(mode: LayoutBlockMode): string {
  if (mode === 'stack' || mode === 'zigzag') return 'flex flex-col';
  // A cluster is an inline wrapped row (chips, pills): it hugs content and
  // wraps at any width instead of collapsing to a one-column grid.
  if (mode === 'cluster') return 'flex flex-wrap';
  return cn('grid', layoutBlockColClasses(mode));
}

/** Count direct slot peers; unwraps renderer Fragments (Children.toArray does not). */
function slotChildCount(slotContent: ReactNode): number {
  if (slotContent == null || typeof slotContent === 'boolean') return 0;
  if (Array.isArray(slotContent)) {
    return slotContent.reduce<number>((n, child) => n + slotChildCount(child), 0);
  }
  if (isValidElement(slotContent) && slotContent.type === Fragment) {
    return slotChildCount(
      (slotContent.props as { children?: ReactNode }).children,
    );
  }
  return Children.count(slotContent);
}

export function Component({
  slotContent,
  layout,
  childSpans,
  gap,
  align,
  justify,
  copy,
  builderInsert,
}: SectionProps) {
  const childCount = slotChildCount(slotContent);
  const mode = resolveLayoutBlockMode(layout, childCount);
  // Explicit spans are the truth: the children carry their own col-span-N, so the
  // container drops the preset template for the raw 12-column grid.
  const spanned = Boolean(childSpans && childSpans.length > 0);
  // A node without a gap keeps the shipped defaults (the raw grid's gutter, the
  // preset template's per-mode gap), so sites built before the field render as before.
  const gapClass = gap ? CONTAINER_GAP_CLASS[gap] : undefined;
  // A cluster (chips, pills, a CTA pair) centres its items on the cross axis and takes its
  // justification from the band, so a cover or centered band centres the row.
  const effectiveAlign = align ?? (mode === 'cluster' ? 'center' : 'stretch');
  const alignClass = CONTAINER_ALIGN_CLASS[effectiveAlign];
  const justifyClass = justify
    ? CONTAINER_JUSTIFY_CLASS[justify]
    : mode === 'cluster'
      ? CLUSTER_BAND_JUSTIFY
      : undefined;
  // Closed copy slot, distinct from the `align` node field above (that one is cross-axis
  // items-*; this one is a content-centring toggle authors set per instance). A stack
  // centres on the cross axis same as items-center would; a cluster/grid centres its
  // tracks on the main axis instead. Either way the container's own text centres and
  // hands `--heading-align` to a nested block-heading, matching the band-level rule in
  // layout-section/Component.tsx (`text-start [--heading-align:start]` on a stack band).
  const contentCentered = (copy?.align ?? '').trim().toLowerCase() === 'center';
  const isStackLike = mode === 'stack' || mode === 'zigzag';
  const centerClass = contentCentered
    ? cn('text-center', '[--heading-align:center]', isStackLike ? 'items-center' : 'justify-center')
    : undefined;

  // A kept row (a header bar) is one spread row at every width, whatever the mode stacks to.
  const keepRow = parseContainerPhone(copy?.phone) === 'row';

  if (!slotContent && !builderInsert) return null;
  const showChrome = Boolean(builderInsert);

  return (
    <div
      data-section="layout-container"
      data-layout={mode}
      data-gap={gap ?? undefined}
      data-align={effectiveAlign}
      data-phone={keepRow ? 'row' : undefined}
      className={cn(
        'site-layout-container mx-auto w-full max-w-[var(--site-container-max,64rem)]',
        showChrome && 'min-h-[4rem] rounded-lg border border-dashed border-border/60 p-4',
        slotContent && keepRow
          ? cn(CONTAINER_PHONE_ROW_CLASS, gapClass ?? CONTAINER_PHONE_ROW_GAP, centerClass)
          : slotContent
          ? cn(
              spanned
                // One real track below md: a 12-track grid at phone width owes
                // eleven inter-column gaps, and a gutter-sized gap alone can
                // exceed the container, collapsing every track to 0 and
                // pushing a full-row item past the viewport (the clipped Cart).
                ? cn('grid grid-cols-1 @cq-md/site:grid-cols-12', gapClass ?? 'gap-gutter')
                : gapClass
                  ? cn(containerStructureClass(mode), gapClass)
                  : layoutBlockClasses(mode),
              // A rail's cells stay blocks, so a sticky column keeps its own height and can pin.
              !['stack', 'zigzag', 'cluster', 'rail'].includes(mode) && GRID_CELL_FILL,
              mode === 'zigzag' && ZIGZAG_ROW_FLIP,
              alignClass,
              justifyClass,
              centerClass,
            )
          : undefined,
      )}
    >
      {slotContent ? (
        slotContent
      ) : (
        <LayoutDropHint label="Add column or component" />
      )}
    </div>
  );
}

import type { SectionCopySchemaField } from '../types';

export const schema: SectionCopySchemaField[] = [
  {
    key: 'align',
    label: 'Content',
    type: 'text',
    placeholder: '',
    maxLength: 8,
    advanced: true,
    group: 'Structure',
    helpText:
      'Center centers everything inside this container, including any headings inside it. Default aligns content to the start.',
    options: [
      { value: '', label: 'Default' },
      { value: 'center', label: 'Center' },
    ],
  },
  {
    key: 'phone',
    label: 'On a phone',
    type: 'text',
    placeholder: '',
    maxLength: 8,
    advanced: true,
    group: 'Structure',
    helpText:
      'Keep one row holds the items side by side on every screen, first item at its own size and the last aligned to the end. Default stacks them on a phone.',
    options: [
      { value: '', label: 'Default' },
      { value: 'row', label: 'Keep one row' },
    ],
  },
];

import type { SectionMeta } from '../types';

export const meta: SectionMeta = {
  id: 'layout-container',
  displayName: 'Container',
  family: 'structure',
  tags: ['structure', 'layout', 'container'],
  layouts: [
    { id: 'stack', label: 'Stack' },
    { id: 'split', label: 'Split' },
    { id: 'split-40-60', label: 'Split 40/60' },
    { id: 'split-60-40', label: 'Split 60/40' },
    { id: 'grid-2', label: '2 columns' },
    { id: 'grid-3', label: '3 columns' },
    { id: 'grid-4', label: '4 columns' },
    { id: 'zigzag', label: 'Zigzag' },
    { id: 'cluster', label: 'Cluster' },
    { id: 'rail', label: 'Rail' },
  ],
};

import type { BrandContext } from '@/lib/brandContext';

export function writeCopy(_ctx: BrandContext) {
  return {};
}