// Editable design settings for the generated application documents.
//
// Same contract as lib/prompts.js: the defaults live here, an override is a row
// in the `design` table, and deleting the row restores the default.
//
// Three layouts ship today:
//
//   sidebar — the classic: neutral greys, tinted sidebar, DIN-5008 letter. The
//             accent is a single restrained colour; hierarchy comes from weight
//             and tracking. Right for almost every office application.
//
//   social  — a playful media-kit look (rounded cards, pills, hearts, a script
//             headline, a full-page tinted background). Right for creative,
//             social-media and design-adjacent roles — and deliberately loud.
//
//   sunny   — an editorial poster look: white page, oversized display headings
//             in a deep accent, pastel accent bars that alternate left/right, a
//             photo breaking out of a tinted hero band, a solid role badge and
//             level bars for the languages. Bold but tidy — right for marketing,
//             media and design roles that still want a readable, gridded page.
//
//   tupfen  — the quiet one with a wink: a white page, the name centred and set
//             large in plain ink, airy body text — and scattered coral dots in
//             the margins, some running off the page edge. The dots are the only
//             colour on the sheet; the résumé picks the motif back up as section
//             markers, bullets and five-dot language meters. Restrained enough
//             for any office, but nobody mistakes it for a template.
//
// The cover letter always follows the résumé's layout, so both documents arrive
// as one coherent set — that is the whole point of picking a design here.
//
// The palette stays closed (no free colour picker): every tone is one that still
// works when an HR department prints it in greyscale.

// Accent colours. In `sidebar` the accent is the *only* colour; in `social` and
// `sunny` the whole page palette (bands, cards, pills) is derived from it, so
// those layouts work in berry as well as in deep blue.
const AKZENTE = [
  { key: 'anthrazit', label: 'Anthrazit', rgb: [23, 23, 23] },
  { key: 'tiefblau', label: 'Tiefblau', rgb: [30, 58, 95] },
  { key: 'bordeaux', label: 'Bordeaux', rgb: [122, 31, 47] },
  { key: 'waldgruen', label: 'Waldgrün', rgb: [27, 67, 50] },
  { key: 'stahlblau', label: 'Stahlblau', rgb: [51, 65, 85] },
  { key: 'kupfer', label: 'Kupfer', rgb: [124, 62, 24] },
  { key: 'beere', label: 'Beere (Sunny)', rgb: [109, 24, 74] },
  // Deliberately deeper than the pastel dots of Tupfen's reference: in `sidebar`
  // the accent *is* the text colour, and a pale coral would be unreadable there.
  // Tupfen's dots are tinted up from this tone, which lands them back at pastel.
  { key: 'koralle', label: 'Koralle (Tupfen)', rgb: [222, 106, 106] },
  { key: 'pink', label: 'Pink (verspielt)', rgb: [232, 54, 143] },
  { key: 'violett', label: 'Violett (verspielt)', rgb: [147, 51, 187] },
];

const LAYOUTS = [
  { key: 'sidebar', label: 'Klassisch mit Sidebar (Standard)' },
  { key: 'social', label: 'Social Media (verspielt)' },
  { key: 'sunny', label: 'Sunny (plakativ, Farbbänder)' },
  { key: 'tupfen', label: 'Tupfen (dezent, verspielte Punkte)' },
];

const SIDEBAR_VARIANTEN = [
  { key: 'neutral', label: 'Neutral grau (Standard)' },
  { key: 'getoent', label: 'Im Akzent getönt' },
  { key: 'weiss', label: 'Weiß (ohne Band)' },
];

const FOTO_FORMEN = [
  { key: 'eckig', label: 'Eckig' },
  { key: 'rund', label: 'Rund' },
];

const SCHRIFT_STUFEN = [
  { key: '90', label: '90 % (kompakt)' },
  { key: '95', label: '95 %' },
  { key: '100', label: '100 % (Standard)' },
  { key: '105', label: '105 %' },
  { key: '110', label: '110 % (groß)' },
];

// Defaults per layout: the playful layout is pink and round by default, because
// anthracite-and-square would defeat the point of choosing it. Any of these can
// still be overridden individually.
const LAYOUT_DEFAULTS = {
  sidebar: { akzent: 'anthrazit', foto_form: 'eckig' },
  social: { akzent: 'pink', foto_form: 'rund' },
  // Sunny is built around the berry/pastel pairing of its reference; the photo
  // sits in a square frame that breaks out of the hero band, so square it is.
  sunny: { akzent: 'beere', foto_form: 'eckig' },
  // Tupfen scatters coral dots; a round portrait is simply the largest of them,
  // so it falls in with the motif instead of fighting it.
  tupfen: { akzent: 'koralle', foto_form: 'rund' },
};

const DEFAULTS = {
  layout: 'sidebar',
  akzent: 'anthrazit',
  sidebar: 'neutral',
  foto_anzeigen: '1',
  foto_form: 'eckig',
  schrift: '100',
};

const FELDER = [
  { key: 'layout', label: 'Layout', optionen: LAYOUTS },
  { key: 'akzent', label: 'Akzentfarbe', optionen: AKZENTE },
  { key: 'sidebar', label: 'Sidebar-Hintergrund', optionen: SIDEBAR_VARIANTEN, nurLayout: 'sidebar' },
  { key: 'foto_form', label: 'Form des Bewerberfotos', optionen: FOTO_FORMEN },
  { key: 'schrift', label: 'Schriftgröße', optionen: SCHRIFT_STUFEN },
];

const NEUTRAL_SIDEBAR = [242, 243, 245];

// Mix a colour towards white. amount = 0 -> white, 1 -> the colour itself.
function tint(rgb, amount) {
  return rgb.map((c) => Math.round(c * amount + 255 * (1 - amount)));
}
// Mix a colour towards black.
function shade(rgb, amount) {
  return rgb.map((c) => Math.round(c * amount));
}

function findOption(list, key, fallbackKey) {
  return list.find((o) => o.key === key) || list.find((o) => o.key === fallbackKey);
}

// A checkbox paired with a hidden fallback submits *both* values, which Express
// hands over as an array — the last entry is the effective one.
function one(v) {
  return Array.isArray(v) ? v[v.length - 1] : v;
}

// Fold the stored overrides onto the defaults, dropping unknown keys/values so a
// stale row, a hand-crafted query string or a checkbox pair can never produce an
// invalid theme. Fields not explicitly set fall back to the *layout's* default,
// which is why switching to "social" turns pink without touching anything else.
function settings(overrides = {}) {
  const layoutRaw = one(overrides.layout);
  const layout = LAYOUTS.some((l) => l.key === layoutRaw) ? String(layoutRaw) : DEFAULTS.layout;

  const out = { ...DEFAULTS, ...(LAYOUT_DEFAULTS[layout] || {}), layout };

  for (const f of FELDER) {
    if (f.key === 'layout') continue;
    const v = one(overrides[f.key]);
    if (v && f.optionen.some((o) => o.key === String(v))) out[f.key] = String(v);
  }
  const foto = one(overrides.foto_anzeigen);
  if (foto === '0' || foto === '1') out.foto_anzeigen = foto;
  return out;
}

// Build the concrete theme the renderer draws with. Everything the PDF code
// needs to know about the user's choices is in here — the renderer itself has
// no idea these are configurable.
function resolve(overrides = {}) {
  const s = settings(overrides);
  const accent = findOption(AKZENTE, s.akzent, 'anthrazit').rgb;

  let sidebarBg;
  if (s.sidebar === 'weiss') sidebarBg = [255, 255, 255];
  else if (s.sidebar === 'getoent') sidebarBg = tint(accent, 0.08);
  else sidebarBg = NEUTRAL_SIDEBAR;

  // Résumé palettes, one per layout. Every key exists in every palette so the
  // renderer can read `t.rc.<x>` without knowing which layout it is drawing.
  const RC = {
    sidebar: {
      ink: [33, 33, 33],
      sub: [92, 96, 100],
      hair: [208, 210, 214],
      accent,
      pageBg: null,       // no page tint in the classic layout
      cardBg: [255, 255, 255],
      cardBorder: [208, 210, 214],
      deko: [208, 210, 214],   // the classic layout draws no sparkles; kept for shape parity
      dekoHell: [230, 232, 235],
      band: tint(accent, 0.14),
      pillBg: tint(accent, 0.12),
      pillInk: accent,
      sidebarBg,
      track: [199, 202, 208],
      onSide: [38, 40, 44],
      onSideSub: [96, 100, 106],
    },
    // The playful layout derives its whole palette from the accent: a tinted
    // page, near-white cards with a soft border, pill chips, and a warm dark ink
    // that is the accent shaded down rather than plain black.
    social: {
      ink: shade(accent, 0.35),
      sub: tint(shade(accent, 0.55), 0.75),
      hair: tint(accent, 0.30),
      accent,
      pageBg: tint(accent, 0.10),
      cardBg: [255, 255, 255],
      cardBorder: tint(accent, 0.28),
      // Sparkles/blob sit on the tinted page, so they need more punch than the
      // card border or they simply vanish.
      deko: tint(accent, 0.45),
      dekoHell: tint(accent, 0.22),
      band: tint(accent, 0.22),
      pillBg: tint(accent, 0.18),
      pillInk: shade(accent, 0.6),
      sidebarBg,          // unused in this layout, kept so the shape stays stable
      track: tint(accent, 0.45),
      onSide: shade(accent, 0.35),
      onSideSub: tint(shade(accent, 0.55), 0.75),
    },
    // Sunny keeps the page white and puts the colour into solid blocks: pastel
    // bands and rails on one side, the full-strength accent in the display
    // headings and the role badge. Only two tones, used at maximum contrast.
    sunny: {
      ink: [40, 36, 42],
      sub: [124, 118, 126],
      hair: tint(accent, 0.22),
      accent,
      pageBg: null,       // white page — the colour lives in the bands
      cardBg: [255, 255, 255],
      cardBorder: tint(accent, 0.22),
      deko: tint(accent, 0.30),
      dekoHell: tint(accent, 0.16),
      band: tint(accent, 0.24),      // the pastel hero band and section bars
      pillBg: accent,                // solid badge…
      pillInk: [255, 255, 255],      // …with the text knocked out white
      sidebarBg,          // unused
      track: tint(accent, 0.16),     // rail behind a language level bar
      onSide: [40, 36, 42],
      onSideSub: [124, 118, 126],
    },
    // Tupfen is a monochrome page that happens to have confetti on it. The text
    // is ink on white throughout — the accent never touches a paragraph, only
    // the dots: the scattered ones in the margins, the section markers, the
    // bullets, the language meters. The hairline stays a *neutral* grey rather
    // than a tinted one, or the restraint collapses and the page turns pink.
    tupfen: {
      ink: [26, 26, 28],
      sub: [112, 114, 120],
      hair: [226, 228, 232],
      accent,
      pageBg: null,                  // white page — the dots are the whole design
      cardBg: [255, 255, 255],
      cardBorder: [226, 228, 232],
      deko: tint(accent, 0.62),      // the dots' base tone
      dekoHell: tint(accent, 0.34),  // …and the paler ones behind them, for depth
      band: tint(accent, 0.14),
      pillBg: tint(accent, 0.12),
      pillInk: shade(accent, 0.72),
      sidebarBg,          // unused
      track: tint(accent, 0.20),     // an unfilled dot of a language meter
      onSide: [26, 26, 28],
      onSideSub: [112, 114, 120],
    },
  };
  const rc = RC[s.layout] || RC.sidebar;

  // The cover letter always mirrors the résumé, so the two documents read as one
  // set — a playful CV never arrives with a stiff monochrome letter.
  const LC = {
    sidebar: {
      ink: [26, 26, 26],
      muted: [92, 96, 100],
      hair: [206, 208, 212],
      accent,
      pageBg: null,
      cardBg: [255, 255, 255],
      cardBorder: [206, 208, 212],
      deko: [206, 208, 212],
      dekoHell: [230, 232, 235],
      band: rc.band,
      pillBg: tint(accent, 0.12),
      pillInk: accent,
    },
    social: {
      ink: rc.ink,
      muted: rc.sub,
      hair: rc.hair,
      accent,
      pageBg: rc.pageBg,
      cardBg: rc.cardBg,
      cardBorder: rc.cardBorder,
      deko: rc.deko,
      dekoHell: rc.dekoHell,
      band: rc.band,
      pillBg: rc.pillBg,
      pillInk: rc.pillInk,
    },
    sunny: {
      ink: rc.ink,
      muted: rc.sub,
      hair: rc.hair,
      accent,
      pageBg: rc.pageBg,
      cardBg: rc.cardBg,
      cardBorder: rc.cardBorder,
      deko: rc.deko,
      dekoHell: rc.dekoHell,
      band: rc.band,
      // The letter's role badge sits on the pastel head band, so a solid accent
      // slug reads too loud next to the résumé's poster. A white pill with the
      // accent knocked out keeps the motif but softens it — the letter is the
      // quiet twin, not a second poster.
      pillBg: rc.cardBg,
      pillInk: accent,
    },
    // Tupfen's letter is not the quieter twin of anything — the résumé is already
    // quiet. Both sheets are the same white page with the same confetti, so the
    // letter simply takes the résumé's tones unchanged.
    tupfen: {
      ink: rc.ink,
      muted: rc.sub,
      hair: rc.hair,
      accent,
      pageBg: rc.pageBg,
      cardBg: rc.cardBg,
      cardBorder: rc.cardBorder,
      deko: rc.deko,
      dekoHell: rc.dekoHell,
      band: rc.band,
      pillBg: rc.pillBg,
      pillInk: rc.pillInk,
    },
  };
  const lc = LC[s.layout] || LC.sidebar;

  // Which typefaces the renderer registers and draws with. The playful layout
  // adds a script face for its "Hallo, ich bin" line; Sunny lives off Poppins
  // Bold alone (its whole hierarchy is size, not style); the classic one stays
  // on Lato and embeds nothing extra. Tupfen takes Poppins too — the reference's
  // geometric grotesk, whose round, wide letterforms rhyme with the dots.
  const FONTS = {
    sidebar: { sans: 'Lato', script: null },
    social: { sans: 'Poppins', script: 'Pacifico' },
    sunny: { sans: 'Poppins', script: null },
    tupfen: { sans: 'Poppins', script: null },
  };

  return {
    layout: s.layout,
    fonts: FONTS[s.layout] || FONTS.sidebar,
    rc,
    lc,
    foto: {
      anzeigen: s.foto_anzeigen !== '0',
      rund: s.foto_form === 'rund',
    },
    // Starting scale for the one-page fit. The auto-scaler may still shrink
    // below this when there is a lot of content — it never grows past it.
    scale: (Number(s.schrift) || 100) / 100,
  };
}

// Field list for the Vorlagen UI, with the current selection marked. Fields that
// only apply to one layout carry `nurLayout` so the form can hide them.
function list(overrides = {}) {
  const s = settings(overrides);
  return FELDER.map((f) => ({
    key: f.key,
    label: f.label,
    aktuell: s[f.key],
    nurLayout: f.nurLayout || null,
    optionen: f.optionen.map((o) => ({ key: o.key, label: o.label, gewaehlt: o.key === s[f.key] })),
  }));
}

// True when the user deviates from what the chosen layout would ship with.
function isAngepasst(overrides = {}) {
  const s = settings(overrides);
  const basis = { ...DEFAULTS, ...(LAYOUT_DEFAULTS[s.layout] || {}), layout: s.layout };
  return s.layout !== DEFAULTS.layout || Object.keys(basis).some((k) => s[k] !== basis[k]);
}

module.exports = {
  DEFAULTS, LAYOUT_DEFAULTS, AKZENTE, LAYOUTS, FELDER,
  settings, resolve, list, isAngepasst,
  defaultTheme: () => resolve({}),
};