import {
  escapeHtml as esc,
  localizeTemplate,
  resolveLocale,
  translateMessage,
  viewerCatalog,
} from './i18n.mjs';

export { esc };

export function renderDefinitions() {
  return `        <!-- Definitions -->
        <defs>
          <marker id="arrowhead" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
            <polygon points="0 0, 10 3.5, 0 7" class="m-default" />
          </marker>
          <marker id="arrowhead-emphasis" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
            <polygon points="0 0, 10 3.5, 0 7" class="m-emphasis" />
          </marker>
          <marker id="arrowhead-security" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
            <polygon points="0 0, 10 3.5, 0 7" class="m-security" />
          </marker>
          <marker id="arrowhead-dashed" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
            <polygon points="0 0, 10 3.5, 0 7" class="m-dashed" />
          </marker>
          <pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse">
            <path d="M 40 0 L 0 0 0 40" class="c-grid" stroke-width="0.5"/>
          </pattern>
        </defs>`;
}

const SIGIL_TONE = {
  frontend: 'frontend',
  start: 'frontend',
  backend: 'backend',
  active: 'backend',
  database: 'database',
  success: 'database',
  cloud: 'cloud',
  waiting: 'cloud',
  security: 'security',
  failure: 'security',
  messagebus: 'messagebus',
  external: 'external',
  neutral: 'external',
};

const SIGIL_SHAPE = {
  frontend: `<rect x="2" y="3" width="12" height="10" rx="2"/>
            <path d="M2 6.5h12"/>
            <circle cx="4.1" cy="4.8" r=".7" class="sigil-fill"/>
            <circle cx="6.3" cy="4.8" r=".7" class="sigil-fill"/>`,
  backend: `<path d="M6 3 3 8l3 5M10 3l3 5-3 5"/>`,
  database: `<ellipse cx="8" cy="4" rx="5" ry="2"/>
            <path d="M3 4v8c0 1.1 2.2 2 5 2s5-.9 5-2V4M3 8c0 1.1 2.2 2 5 2s5-.9 5-2"/>`,
  cloud: `<path d="M4.3 12.5h7.3a2.4 2.4 0 0 0 .2-4.8 4 4 0 0 0-7.5-1.3A3.1 3.1 0 0 0 4.3 12.5Z"/>`,
  security: `<path d="M8 2.2 13 4v3.5c0 3.1-1.8 5.4-5 6.5-3.2-1.1-5-3.4-5-6.5V4Z"/>
            <path d="m5.8 8 1.5 1.5 3-3"/>`,
  messagebus: `<path d="M2.5 4.5h11M2.5 8h11M2.5 11.5h11"/>
            <circle cx="5" cy="4.5" r="1" class="sigil-fill"/>
            <circle cx="10.5" cy="8" r="1" class="sigil-fill"/>
            <circle cx="7" cy="11.5" r="1" class="sigil-fill"/>`,
  external: `<rect x="2.5" y="5" width="8.5" height="8" rx="1.5"/>
            <path d="M8 2.5h5.5V8M13.5 2.5 7.5 8.5"/>`,
  start: `<circle cx="8" cy="8" r="5"/>
            <path d="m7 5.4 3.6 2.6L7 10.6Z" class="sigil-fill"/>`,
  active: `<path d="M2 8h3l1.5-3.5L9 12l1.6-4H14"/>`,
  waiting: `<path d="M4 2.5h8M4 13.5h8M5 3c0 2.8 2 3.2 3 5-1 1.8-3 2.2-3 5M11 3c0 2.8-2 3.2-3 5 1 1.8 3 2.2 3 5"/>`,
  success: `<circle cx="8" cy="8" r="5.3"/>
            <path d="m5.2 8 1.8 1.8 3.8-4"/>`,
  failure: `<circle cx="8" cy="8" r="5.3"/>
            <path d="m5.7 5.7 4.6 4.6m0-4.6-4.6 4.6"/>`,
  neutral: `<rect x="3" y="3" width="10" height="10" rx="2"/>
            <circle cx="8" cy="8" r="1.2" class="sigil-fill"/>`,
};

// A quiet, renderer-owned role stamp. It is authored SVG content rather than a
// viewer overlay, so it survives canonical export while adding no focus target,
// accessible name, layout box, or interaction state of its own.
export function renderSemanticSigil(kind, { x, y, size = 11 } = {}) {
  const normalized = Object.hasOwn(SIGIL_SHAPE, kind) ? kind : 'neutral';
  const tone = SIGIL_TONE[normalized] || 'external';
  const scale = size / 16;
  return `<g aria-hidden="true" data-semantic-sigil="${esc(normalized)}" class="semantic-sigil s-${tone}" transform="translate(${x} ${y}) scale(${scale})">
            ${SIGIL_SHAPE[normalized]}
          </g>`;
}

export function renderCards(cards) {
  const list = Array.isArray(cards) ? cards : [];
  return `    <!-- Info Cards -->
    <div class="cards">
${list.map((card) => `      <div class="card">
        <div class="card-header">
          <div class="card-dot ${esc(card.dot)}"></div>
          <h3>${esc(card.title)}</h3>
        </div>
        <ul>
${card.items.map((item) => `          <li>&bull; ${esc(item)}</li>`).join('\n')}
        </ul>
      </div>`).join('\n\n')}
    </div>`;
}

const SVG_SLOT_RE = /      <!-- ARCHIFY:SVG_SLOT_START -->[\s\S]*?      <!-- ARCHIFY:SVG_SLOT_END -->/;
const CARDS_SLOT_RE = /    <!-- ARCHIFY:CARDS_SLOT_START -->[\s\S]*?    <!-- ARCHIFY:CARDS_SLOT_END -->/;
const SUBTITLE_SLOT_RE = /^([ \t]*)<p class="subtitle">\[Subtitle description\]<\/p>[ \t]*(\r?\n)?/m;
const GUIDED_VIEWS_PLACEHOLDER = '<!-- ARCHIFY:GUIDED_VIEWS_DATA -->';
const SOURCE_EVIDENCE_PLACEHOLDER = '    <!-- ARCHIFY:SOURCE_EVIDENCE_DATA -->';
const I18N_PLACEHOLDER = '    <!-- ARCHIFY:I18N_DATA -->';

function serializeScriptJson(value) {
  return JSON.stringify(value)
    .replaceAll('<', '\\u003c')
    .replaceAll('>', '\\u003e')
    .replaceAll('&', '\\u0026');
}

const TEMPLATE_PLACEHOLDERS = [
  '<html lang="en" data-theme="dark" data-preset="[VISUAL PRESET]">',
  '<title>[PROJECT NAME] Architecture Diagram</title>',
  '<h1>[PROJECT NAME] Architecture</h1>',
  GUIDED_VIEWS_PLACEHOLDER,
];

export function applyTemplate(template, {
  title,
  subtitle,
  svg,
  cards,
  locale,
  visualPreset = 'classic',
  guidedViews = [],
  sourceEvidence = null,
}) {
  if (!SVG_SLOT_RE.test(template)) {
    throw new Error('applyTemplate: template missing ARCHIFY:SVG_SLOT sentinel');
  }
  if (!CARDS_SLOT_RE.test(template)) {
    throw new Error('applyTemplate: template missing ARCHIFY:CARDS_SLOT sentinel');
  }
  if (!SUBTITLE_SLOT_RE.test(template)) {
    throw new Error('applyTemplate: template missing subtitle placeholder');
  }
  for (const ph of TEMPLATE_PLACEHOLDERS) {
    if (!template.includes(ph)) {
      throw new Error(`applyTemplate: template missing placeholder ${JSON.stringify(ph)}`);
    }
  }
  // Keep existing custom templates compatible when evidence is not requested.
  // Silently dropping verified evidence would be misleading, so the new slot
  // becomes mandatory only for the opt-in evidence path.
  if (sourceEvidence && !template.includes(SOURCE_EVIDENCE_PLACEHOLDER)) {
    throw new Error(`applyTemplate: repository evidence requires placeholder ${JSON.stringify(SOURCE_EVIDENCE_PLACEHOLDER)}`);
  }
  // Function replacers: a literal `$&`, `$'`, `$\`` or `$$` in titles, labels,
  // or rendered SVG must not be interpreted as a replacement pattern.
  const guidedViewsJson = serializeScriptJson(guidedViews);
  const sourceEvidenceJson = serializeScriptJson(sourceEvidence);
  const resolvedLocale = resolveLocale(locale);
  const i18nJson = serializeScriptJson({ locale: resolvedLocale, messages: viewerCatalog(resolvedLocale) });
  const renderedSubtitle = typeof subtitle === 'string' && subtitle.trim()
    ? `<p class="subtitle">${esc(subtitle)}</p>`
    : '';
  const i18nData = `    <script id="archify-i18n-data" type="application/json">${i18nJson}</script>`;
  const localizedTemplate = localizeTemplate(template, resolvedLocale);
  const templateWithI18n = localizedTemplate.includes(I18N_PLACEHOLDER)
    ? localizedTemplate.replace(I18N_PLACEHOLDER, () => i18nData)
    : localizedTemplate.replace(GUIDED_VIEWS_PLACEHOLDER, () => `${i18nData}\n    ${GUIDED_VIEWS_PLACEHOLDER}`);
  return templateWithI18n
    .replace(TEMPLATE_PLACEHOLDERS[0], () => `<html lang="${esc(resolvedLocale)}" data-theme="dark" data-preset="${esc(visualPreset)}">`)
    .replace(TEMPLATE_PLACEHOLDERS[1], () => `<title>${esc(translateMessage(resolvedLocale, 'page.title', { title }))}</title>`)
    .replace(TEMPLATE_PLACEHOLDERS[2], () => `<h1>${esc(title)}</h1>`)
    .replace(SUBTITLE_SLOT_RE, (_match, indent, newline = '') => renderedSubtitle
      ? `${indent}${renderedSubtitle}${newline}`
      : '')
    .replace(SVG_SLOT_RE, () => svg)
    .replace(CARDS_SLOT_RE, () => cards)
    .replace(GUIDED_VIEWS_PLACEHOLDER, () => `<script id="archify-guided-views-data" type="application/json">${guidedViewsJson}</script>`)
    .replace(SOURCE_EVIDENCE_PLACEHOLDER, () => sourceEvidence
      ? `    <script id="archify-source-evidence-data" type="application/json">${sourceEvidenceJson}</script>`
      : '');
}

// CJK and other wide/fullwidth glyphs render at roughly twice the advance
// width of ASCII in the monospace stacks the template uses. Keep halfwidth
// forms (notably U+FF61–U+FF9F Katakana) out of this set. The explicit ranges
// also cover vertical punctuation and supplementary East Asian scripts that
// literal glyph ranges made difficult to audit.
// Code points that take two columns of advance width: East Asian Wide and
// Fullwidth per UAX #11, tracking Unicode 17.0. That takes in the BMP symbols
// carrying emoji presentation (U+2705, U+2B50, U+26A1, U+231B, ...), which
// render at the same square advance as the supplementary-plane emoji already
// listed here, and Hangul Jamo Extended-A. Two boundary calls worth naming:
// Unicode 16.0 reclassified the trigrams (U+2630-U+2637) and the monogram /
// digram symbols (U+268A-U+268F) from Neutral to Wide, so both are in; and
// Hangul Jamo Extended-A stops at U+A97C, its last assigned jamo, because
// U+A97D-U+A97F are unassigned, and unassigned code points outside the CJK
// ranges UAX #11 names default to Neutral rather than Wide. Spelled out as
// ranges because V8 has no \p{East_Asian_Width=W} property escape.
const FULLWIDTH_RE = /[\u1100-\u115F\u231A-\u231B\u2329-\u232A\u23E9-\u23EC\u23F0\u23F3\u25FD-\u25FE\u2614-\u2615\u2630-\u2637\u2648-\u2653\u267F\u268A-\u268F\u2693\u26A1\u26AA-\u26AB\u26BD-\u26BE\u26C4-\u26C5\u26CE\u26D4\u26EA\u26F2-\u26F3\u26F5\u26FA\u26FD\u2705\u270A-\u270B\u2728\u274C\u274E\u2753-\u2755\u2757\u2795-\u2797\u27B0\u27BF\u2B1B-\u2B1C\u2B50\u2B55\u2E80-\uA4CF\uA960-\uA97C\uAC00-\uD7A3\uF900-\uFAFF\uFE10-\uFE19\uFE30-\uFE6F\uFF01-\uFF60\uFFE0-\uFFE6\u{16FE0}-\u{18DFF}\u{1AFF0}-\u{1AFFF}\u{1B000}-\u{1B2FF}\u{1F000}-\u{1FAFF}\u{20000}-\u{3FFFD}]/u;

// A variation selector (U+FE00-U+FE0F) carries no advance of its own: it
// re-presents the character before it. VS15 (U+FE0E) asks for text
// presentation, which renders narrow; VS16 (U+FE0F) asks for emoji
// presentation, which renders at the square emoji advance. So a base plus a
// selector is measured from the selector, not from the base -- otherwise
// widening the emoji-presentation bases above turns U+2B50 U+FE0F from two
// units into three while the glyph on screen stays one square, and leaves
// U+2708 U+FE0F at two only because its base happens to be narrow.
//
// A selector following a base that cannot take emoji presentation is
// malformed input; measuring it wide is the safe direction here, since
// over-measuring pads a box while under-measuring spills the label out of it.
const VARIATION_SELECTOR_FIRST = 0xfe00;
const VARIATION_SELECTOR_LAST = 0xfe0f;
const VARIATION_SELECTOR_TEXT = 0xfe0e;
const VARIATION_SELECTOR_EMOJI = 0xfe0f;

export function textUnits(text) {
  const chars = Array.from(String(text ?? ''));
  let units = 0;
  for (let i = 0; i < chars.length; i += 1) {
    const codePoint = chars[i].codePointAt(0);
    if (codePoint >= VARIATION_SELECTOR_FIRST && codePoint <= VARIATION_SELECTOR_LAST) continue;
    const next = i + 1 < chars.length ? chars[i + 1].codePointAt(0) : -1;
    if (next === VARIATION_SELECTOR_EMOJI) units += 2;
    else if (next === VARIATION_SELECTOR_TEXT) units += 1;
    else units += FULLWIDTH_RE.test(chars[i]) ? 2 : 1;
  }
  return units;
}