/* ============================================================
   qft-variations-light.mjs — sketch 04.
   Lighter backgrounds, larger field scales (most bleed past the
   frame), per-edge hue GRADIENTS within each field, and
   noticeably THICKER strokes than previous sketches. Custom
   paperOverride RGB for the more unusual pale grounds.
   Output → output/qft/sketch04/
   ============================================================ */
import { writeFileSync, mkdirSync } from 'node:fs';
import { generateQFTScene } from '../src/qft/scene.js';
import { paramsFromSeed } from '../src/qft/params.js';
import { renderQFTSVG } from '../src/qft/renderer.js';

const BASE_SEED = 'FEYNMAN-7167';
const OUT_DIR = 'output/qft/sketch04';
const SIZE = 1800;
mkdirSync(OUT_DIR, { recursive: true });

const F = (hueStart, hueEnd, saturation, lightness, opacity) =>
  ({ hueStart, hueEnd, saturation, lightness, opacity });

// helper: build a paperOverride from one RGB and derive sensible glow stops
const paper = (flat, glowInDelta = [18, 16, 14], glowOutDelta = [-25, -22, -20]) => ({
  flat,
  glowIn:  [flat[0] + glowInDelta[0],  flat[1] + glowInDelta[1],  flat[2] + glowInDelta[2]],
  glowOut: [flat[0] + glowOutDelta[0], flat[1] + glowOutDelta[1], flat[2] + glowOutDelta[2]],
});

// dark header/vignette tones to read against light paper
const DARK_FEATURE = [60, 48, 36];
const DARK_VIGN    = [70, 55, 40];

const variations = [
  {
    name: '01_warm-sunset-cream',
    label: 'Warm sunset · cream · huge cubic bleeding past frame',
    overrides: {
      substrate: 'cream',
      stroke: 2.6,
      cubicScale: 1.75,
      schlegelScale: 0.85,
      e8Count: 3, e8Scale: 0.22, e8OriginRadius: 0.55,
      fields: {
        cubic:    F(0.10, 0.02, 0.65, 0.40, 0.82),    // amber → red
        schlegel: F(0.13, 0.06, 0.45, 0.38, 0.65),    // gold → orange
        e8:       F(0.05, 0.13, 0.75, 0.42, 0.92),    // red → gold
        links:    F(0.95, 0.04, 0.85, 0.38, 0.96),    // pink → red bright
      },
    },
  },
  {
    name: '02_pale-verdigris-linen',
    label: 'Pale verdigris · linen ground · large scales',
    overrides: {
      paperOverride: paper([222, 210, 184]),
      vignOverride: DARK_VIGN,
      featureOverride: DARK_FEATURE,
      stroke: 2.4,
      cubicScale: 1.55,
      schlegelScale: 1.35,
      e8Count: 3, e8Scale: 0.24, e8OriginRadius: 0.48,
      fields: {
        cubic:    F(0.44, 0.50, 0.55, 0.34, 0.82),    // teal → cyan
        schlegel: F(0.06, 0.10, 0.55, 0.38, 0.66),    // copper accents
        e8:       F(0.35, 0.46, 0.60, 0.32, 0.90),    // sage → teal
        links:    F(0.04, 0.10, 0.80, 0.38, 0.95),
      },
    },
  },
  {
    name: '03_rose-peach',
    label: 'Rose pastel on peach paper · huge cubic',
    overrides: {
      paperOverride: paper([232, 200, 175]),
      vignOverride: [90, 50, 40],
      featureOverride: [110, 60, 50],
      stroke: 2.8,
      cubicScale: 1.65,
      schlegelScale: 0.75, schlegelOriginX: 0.20,
      e8Count: 2, e8Scale: 0.28, e8OriginRadius: 0.52,
      fields: {
        cubic:    F(0.92, 0.04, 0.55, 0.42, 0.82),
        schlegel: F(0.88, 0.94, 0.45, 0.40, 0.66),
        e8:       F(0.96, 0.06, 0.65, 0.42, 0.92),
        links:    F(0.90, 0.04, 0.85, 0.38, 0.96),
      },
    },
  },
  {
    name: '04_pale-sky-ivory',
    label: 'Pale sky · ivory · huge Schlegel tesseract',
    overrides: {
      paperOverride: paper([232, 222, 200]),
      vignOverride: [60, 50, 40],
      featureOverride: DARK_FEATURE,
      stroke: 2.4,
      cubicScale: 0.70,
      schlegelScale: 1.95,                              // massive — bleeds significantly
      e8Count: 3, e8Scale: 0.20, e8OriginRadius: 0.60,
      fields: {
        cubic:    F(0.58, 0.66, 0.55, 0.30, 0.80),    // blue → violet
        schlegel: F(0.62, 0.72, 0.55, 0.32, 0.66),    // indigo → violet
        e8:       F(0.55, 0.70, 0.65, 0.30, 0.92),
        links:    F(0.60, 0.80, 0.85, 0.32, 0.96),
      },
    },
  },
  {
    name: '05_mint-gold-pale',
    label: 'Mint & gold · pale-mint ground',
    overrides: {
      paperOverride: paper([210, 225, 208]),
      vignOverride: [30, 55, 35],
      featureOverride: [40, 70, 45],
      stroke: 2.6,
      cubicScale: 1.50,
      schlegelScale: 1.25,
      e8Count: 3, e8Scale: 0.26, e8OriginRadius: 0.48,
      fields: {
        cubic:    F(0.40, 0.50, 0.55, 0.30, 0.82),    // mint teal
        schlegel: F(0.10, 0.16, 0.60, 0.36, 0.66),    // gold
        e8:       F(0.13, 0.20, 0.80, 0.40, 0.92),
        links:    F(0.08, 0.14, 0.85, 0.40, 0.96),
      },
    },
  },
  {
    name: '06_bone-radial-gradient',
    label: 'Bone china · radial gradient (cool centre → warm edges)',
    overrides: {
      paperOverride: paper([234, 230, 222]),
      vignOverride: [70, 60, 50],
      featureOverride: DARK_FEATURE,
      stroke: 2.6, gradientMode: 'radial',
      cubicScale: 1.55, schlegelScale: 1.30,
      e8Count: 3, e8Scale: 0.22, e8OriginRadius: 0.55,
      fields: {
        cubic:    F(0.55, 0.06, 0.62, 0.36, 0.82),    // cyan centre → orange edges
        schlegel: F(0.58, 0.04, 0.50, 0.34, 0.70),
        e8:       F(0.55, 0.05, 0.72, 0.40, 0.92),
        links:    F(0.55, 0.05, 0.85, 0.40, 0.96),
      },
    },
  },
  {
    name: '07_pale-mauve-violet',
    label: 'Pale mauve fog · violet → pink gradients · thick',
    overrides: {
      paperOverride: paper([222, 205, 224]),
      vignOverride: [55, 35, 60],
      featureOverride: [75, 50, 90],
      stroke: 3.0,
      cubicScale: 1.85,                                 // bleeds heavily
      schlegelScale: 0.90,
      e8Count: 3, e8Scale: 0.22, e8OriginRadius: 0.50,
      fields: {
        cubic:    F(0.74, 0.92, 0.55, 0.34, 0.84),
        schlegel: F(0.78, 0.86, 0.50, 0.32, 0.68),
        e8:       F(0.82, 0.96, 0.65, 0.38, 0.92),
        links:    F(0.78, 0.95, 0.85, 0.36, 0.96),
      },
    },
  },
  {
    name: '08_faded-blueprint',
    label: 'Faded blueprint · pale cyan paper · huge Schlegel',
    overrides: {
      paperOverride: paper([186, 214, 228]),
      vignOverride: [40, 55, 70],
      featureOverride: [30, 50, 75],
      stroke: 2.8,
      cubicScale: 0.80,
      schlegelScale: 1.90,
      e8Count: 3, e8Scale: 0.22, e8OriginRadius: 0.55,
      fields: {
        cubic:    F(0.60, 0.66, 0.60, 0.22, 0.86),    // dark blue → navy
        schlegel: F(0.58, 0.62, 0.55, 0.20, 0.66),
        e8:       F(0.62, 0.72, 0.70, 0.28, 0.92),
        links:    F(0.58, 0.68, 0.85, 0.28, 0.96),
      },
    },
  },
  {
    name: '09_linen-sepia-large',
    label: 'Linen · warm sepia gradients · everything LARGE · thickest strokes',
    overrides: {
      paperOverride: paper([226, 210, 178]),
      vignOverride: [80, 55, 30],
      featureOverride: [85, 55, 30],
      stroke: 3.4,                                      // chunkiest of the set
      cubicScale: 1.65, schlegelScale: 1.55,
      e8Count: 3, e8Scale: 0.28, e8OriginRadius: 0.50,
      fields: {
        cubic:    F(0.06, 0.12, 0.55, 0.30, 0.86),
        schlegel: F(0.10, 0.03, 0.45, 0.28, 0.70),
        e8:       F(0.08, 0.16, 0.70, 0.36, 0.92),
        links:    F(0.02, 0.12, 0.85, 0.30, 0.96),
      },
    },
  },
  {
    name: '10_pearl-pastel-spectrum',
    label: 'Pearl · pastel rainbow (per-field hue families)',
    overrides: {
      paperOverride: paper([240, 235, 230]),
      vignOverride: [70, 65, 60],
      featureOverride: [80, 70, 60],
      stroke: 2.8,
      cubicScale: 1.50, schlegelScale: 1.40,
      e8Count: 3, e8Scale: 0.24, e8OriginRadius: 0.55,
      fields: {
        cubic:    F(0.55, 0.70, 0.50, 0.42, 0.80),    // cyan → violet pastel
        schlegel: F(0.08, 0.18, 0.45, 0.42, 0.62),    // gold → yellow pastel
        e8:       F(0.86, 0.04, 0.55, 0.42, 0.86),    // pink → red pastel
        links:    F(0.38, 0.55, 0.70, 0.40, 0.94),    // green → cyan pastel
      },
    },
  },
];

const base = paramsFromSeed(BASE_SEED);
for (const v of variations) {
  const params = { ...base, ...v.overrides };
  if (v.overrides.fields) params.fields = v.overrides.fields;
  const svg = renderQFTSVG(generateQFTScene(params), params, SIZE);
  const path = `${OUT_DIR}/${v.name}.svg`;
  writeFileSync(path, svg);
  console.log(`ok ${v.name} · ${v.label}`);
}
console.log(`\nrendered ${variations.length} variations → ${OUT_DIR}/`);