import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";

import {
  CHART_SIZE,
  HOUSE_NUMBERS,
  HOUSE_POLYGONS,
  pointInPolygon,
  polygonArea,
} from "../src/lib/north-indian-chart-geometry.ts";
import {
  parseReportChartBlock,
  planetDisplayLabel,
  stripReportChartBlocks,
  toNorthIndianChart,
  type ReportChartBlock,
} from "../src/lib/report-chart-block.ts";

const fixture = JSON.parse(
  readFileSync(new URL("./fixtures/report-chart-blocks-golden.json", import.meta.url), "utf8"),
) as {
  sourceCommand: string;
  blocks: ReportChartBlock[];
};

function wrapMarkdown(blocks: readonly ReportChartBlock[]): string {
  return blocks.map((block) => [
    `#### ${block.title}`,
    "",
    `<svg viewBox="0 0 420 480"></svg>`,
    "",
    "```jyotish-chart",
    JSON.stringify(block),
    "```",
    "",
  ].join("\n")).join("\n");
}

test("golden fixture records the engine command that produced it", () => {
  assert.match(fixture.sourceCommand, /test_report_chart_block|build_professional_report_reference_packet|render_pl9_markdown/);
});

test("all 22 golden blocks parse", () => {
  assert.equal(fixture.blocks.length, 22);
  for (const raw of fixture.blocks) {
    const parsed = parseReportChartBlock(JSON.stringify(raw));
    assert.ok(parsed, `block ${raw.id} should parse`);
  }
});

test("D1 whole-sign houses start at the ascendant and wrap at 12", () => {
  const d1 = fixture.blocks.find((block) => block.id === "D1");
  assert.ok(d1);
  const chart = toNorthIndianChart(d1);
  assert.equal(chart.houses[0]?.sign, d1.ascendant.sign);
  const signs = [
    "Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo",
    "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces",
  ] as const;
  const ascIndex = signs.indexOf(d1.ascendant.sign);
  assert.equal(chart.houses[11]?.sign, signs[(ascIndex + 11) % 12]);
});

test("retrograde labels include 逆 after the planet letter", () => {
  const sample = fixture.blocks.flatMap((block) => block.planets).find((planet) => planet.retrograde);
  assert.ok(sample, "golden chart should contain at least one retrograde planet");
  const label = planetDisplayLabel(sample.name, sample.degree, true);
  assert.match(label, /逆 \d+°$/);
});

test("malicious title is not drawn; parse still succeeds", () => {
  const d1 = fixture.blocks.find((block) => block.id === "D1");
  assert.ok(d1);
  const poisoned = parseReportChartBlock(JSON.stringify({
    ...d1,
    title: '<img onerror="alert(1)" src=x>',
  }));
  assert.ok(poisoned);
  const chart = toNorthIndianChart(poisoned);
  const serialized = JSON.stringify(chart);
  assert.doesNotMatch(serialized, /<img/);
  assert.doesNotMatch(serialized, /onerror/);
});

test("invalid payloads return null", () => {
  assert.equal(parseReportChartBlock("{"), null);
  assert.equal(parseReportChartBlock(JSON.stringify({ ...fixture.blocks[0], extra: true })), null);
  assert.equal(parseReportChartBlock(JSON.stringify({ ...fixture.blocks[0], ascendant: { ...fixture.blocks[0].ascendant, degree: 31 } })), null);
  assert.equal(parseReportChartBlock(JSON.stringify({
    ...fixture.blocks[0],
    planets: [{ name: "Uranus", sign: "Aries", degree: 1, retrograde: false }],
  })), null);
});

test("stripReportChartBlocks removes fences and keeps engine SVGs", () => {
  const markdown = wrapMarkdown(fixture.blocks);
  const stripped = stripReportChartBlocks(markdown);
  assert.doesNotMatch(stripped, /```jyotish-chart/);
  assert.equal((stripped.match(/<svg/g) ?? []).length, (markdown.match(/<svg/g) ?? []).length);
});

test("house polygons fill the square without overlapping interiors", () => {
  const total = HOUSE_NUMBERS.reduce((sum, houseNumber) => sum + polygonArea(HOUSE_POLYGONS[houseNumber]), 0);
  assert.ok(Math.abs(total - CHART_SIZE * CHART_SIZE) < 1e-6, `area ${total}`);
  const step = 5;
  for (let x = step; x < CHART_SIZE; x += step) {
    for (let y = step; y < CHART_SIZE; y += step) {
      const hits = HOUSE_NUMBERS.filter((houseNumber) => pointInPolygon({ x, y }, HOUSE_POLYGONS[houseNumber]));
      assert.ok(hits.length <= 1, `point ${x},${y} in ${hits.join(",")}`);
    }
  }
});