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

import { booleanShapePathData, booleanShapePathResult } from "../src/ui/pages/CanvasWorkspace/canvas/booleanShapePath.ts";
import { booleanShapeGroupToPathNode, createBooleanShapeGroupNode, createBooleanShapeResultNode, parseBooleanShapeOptions, patchShapeStyleNode, updateBooleanShapeOperation } from "../src/ui/pages/CanvasWorkspace/canvas/shapeNode.ts";

const first = shapeNode("first", 0, 0, 100, 100);
const second = shapeNode("second", 50, 0, 100, 100);
const operands = [first, second].map((node) => ({
  id: node.id,
  title: node.title,
  x: node.x,
  y: node.y,
  width: node.width,
  height: node.height,
  content: node.content,
  fillColor: node.fillColor,
  strokeColor: node.strokeColor,
  strokeWidth: node.strokeWidth,
  strokeStyle: node.strokeStyle,
  opacity: node.opacity
}));

test("creates real result paths for every boolean operation", () => {
  const union = booleanShapePathData(operands, "union", 150, 100);
  const subtract = booleanShapePathData(operands, "subtract", 150, 100);
  const intersect = booleanShapePathData(operands, "intersect", 150, 100);
  const exclude = booleanShapePathData(operands, "exclude", 150, 100);

  assert.deepEqual(pathBounds(union), { left: 0, top: 0, right: 1, bottom: 1 });
  assertBounds(pathBounds(subtract), { left: 0, top: 0, right: 1 / 3, bottom: 1 });
  assertBounds(pathBounds(intersect), { left: 1 / 3, top: 0, right: 2 / 3, bottom: 1 });
  assert.deepEqual(pathBounds(exclude), { left: 0, top: 0, right: 1, bottom: 1 });
  assert.equal(commandCount(union, 1), 1);
  assert.equal(commandCount(subtract, 1), 1);
  assert.equal(commandCount(intersect, 1), 1);
  assert.equal(commandCount(exclude, 1), 2);
});

test("stores the computed result path on a boolean group", () => {
  const group = createBooleanShapeGroupNode({
    id: "boolean-1",
    title: "UNION",
    operation: "union",
    nodes: [first, second]
  });
  const options = parseBooleanShapeOptions(group.content);

  assert.ok(Array.isArray(options.pathData));
  assert.equal(options.pathData[0], 1);
  assert.equal(options.width, 150);
  assert.equal(options.height, 100);
  assert.equal(group.fillColor, first.fillColor);
  assert.equal(group.strokeColor, first.strokeColor);
});

test("creates boolean operations as ordinary editable path nodes", () => {
  const result = createBooleanShapeResultNode({ id: "result-1", title: "UNION", operation: "union", nodes: [first, second] });
  const options = JSON.parse(result.content);

  assert.equal(result.layerRole, "shape");
  assert.equal(options.kind, "path");
  assert.ok(Array.isArray(options.pathData));
  assert.equal(result.fillColor, first.fillColor);
  assert.equal(result.strokeColor, first.strokeColor);
});

test("keeps each operand stroke style on the boundary it contributes", () => {
  const black = { ...first, strokeColor: "#111111", strokeWidth: 3, strokeStyle: "solid" };
  const purple = { ...second, strokeColor: "#7C3AED", strokeWidth: 5, strokeStyle: "dashed" };
  const styledOperands = [black, purple].map((node) => ({
    id: node.id,
    title: node.title,
    x: node.x,
    y: node.y,
    width: node.width,
    height: node.height,
    content: node.content,
    fillColor: node.fillColor,
    strokeColor: node.strokeColor,
    strokeWidth: node.strokeWidth,
    strokeStyle: node.strokeStyle,
    opacity: node.opacity
  }));
  const computed = booleanShapePathResult(styledOperands, "union", 150, 100);
  const result = createBooleanShapeResultNode({ id: "result-styled", title: "UNION", operation: "union", nodes: [black, purple] });
  const options = JSON.parse(result.content);

  assert.deepEqual(new Set(computed.strokeSegments.map((segment) => segment.strokeColor)), new Set(["#111111", "#7C3AED"]));
  assert.deepEqual(new Set(options.strokeSegments.map((segment) => segment.strokeColor)), new Set(["#111111", "#7C3AED"]));
  assert.ok(options.strokeSegments.some((segment) => segment.strokeColor === "#111111" && segment.strokeWidth === 3 && segment.strokeStyle === "solid"));
  assert.ok(options.strokeSegments.some((segment) => segment.strokeColor === "#7C3AED" && segment.strokeWidth === 5 && segment.strokeStyle === "dashed"));
});

test("lets the single-shape toolbar intentionally update all boolean result strokes", () => {
  const black = { ...first, strokeColor: "#111111", strokeWidth: 3 };
  const purple = { ...second, strokeColor: "#7C3AED", strokeWidth: 5 };
  const result = createBooleanShapeResultNode({ id: "result-patched", title: "UNION", operation: "union", nodes: [black, purple] });
  const patched = patchShapeStyleNode(result, { strokeColor: "#22C55E", strokeWidth: 8 });
  const options = JSON.parse(patched.content);

  assert.deepEqual(new Set(options.strokeSegments.map((segment) => segment.strokeColor)), new Set(["#22C55E"]));
  assert.deepEqual(new Set(options.strokeSegments.map((segment) => segment.strokeWidth)), new Set([8]));
});

test("keeps curved operands as curved result paths", () => {
  const ellipse = {
    ...operands[0],
    content: JSON.stringify({ kind: "ellipse" })
  };
  const rectangle = {
    ...operands[1],
    x: 40,
    y: 20,
    width: 40,
    height: 60
  };
  const result = booleanShapePathData([ellipse, rectangle], "subtract", 100, 100);

  assert.ok(result.includes(5));
  assert.equal(result.at(-1), 11);
});

test("recomputes the result path when the boolean operation changes", () => {
  const union = createBooleanShapeGroupNode({ id: "boolean-2", title: "UNION", operation: "union", nodes: [first, second] });
  const subtract = parseBooleanShapeOptions(updateBooleanShapeOperation(union, "subtract").content);

  assertBounds(pathBounds(subtract.pathData), { left: 0, top: 0, right: 1 / 3, bottom: 1 });
});

test("flattens legacy boolean groups into ordinary path nodes", () => {
  const group = createBooleanShapeGroupNode({ id: "boolean-3", title: "UNION", operation: "union", nodes: [first, second] });
  const result = booleanShapeGroupToPathNode(group);

  assert.equal(result.layerRole, "shape");
  assert.equal(JSON.parse(result.content).kind, "path");
});

test("renders and exports only the computed boolean result path", async () => {
  const previewSource = await readFile(new URL("../src/ui/pages/CanvasWorkspace/canvas/ShapeNodePreview/index.tsx", import.meta.url), "utf8");
  const exportSource = await readFile(new URL("../src/ui/pages/CanvasWorkspace/canvas/nodeExport.ts", import.meta.url), "utf8");
  const booleanPreview = previewSource.slice(previewSource.indexOf("function BooleanShapePreview"), previewSource.indexOf("export function shapeLinePathFromNode"));

  assert.match(booleanPreview, /normalizedPathDataToSvg\(pathData, width, height\)/);
  assert.match(booleanPreview, /fillRule="evenodd"/);
  assert.match(previewSource, /options\.strokeSegments/);
  assert.doesNotMatch(booleanPreview, /<mask|<rect/);
  assert.match(exportSource, /function booleanShapeSvgFragment/);
  assert.match(exportSource, /fill-rule="evenodd"/);
  assert.match(exportSource, /strokeSegments/);
});

test("selects a boolean result as one shape with the single-shape toolbar", async () => {
  const workspaceSource = await readFile(new URL("../src/ui/pages/CanvasWorkspace/index.tsx", import.meta.url), "utf8");

  assert.match(workspaceSource, /createBooleanShapeResultNode\(/);
  assert.match(workspaceSource, /selectOnlyNode\(resultNode\.id\)/);
  assert.match(workspaceSource, /selectedShapeNode && selectedShapeBounds[\s\S]*?<ShapeStyleToolbar/);
});

function shapeNode(id, x, y, width, height) {
  return {
    id,
    type: "frame",
    title: id,
    x,
    y,
    width,
    height,
    content: JSON.stringify({ kind: "rectangle", cornerRadius: 0 }),
    tone: "shape",
    status: "draft",
    layerRole: "shape",
    fillColor: "#ff0000",
    strokeColor: "#111827",
    strokeWidth: 0,
    strokeStyle: "solid",
    opacity: 1
  };
}

function commandCount(pathData, command) {
  let count = 0;
  walkPathData(pathData, (name) => {
    if (name === command) count += 1;
  });
  return count;
}

function assertBounds(actual, expected) {
  for (const key of ["left", "top", "right", "bottom"]) assert.ok(Math.abs(actual[key] - expected[key]) < 0.00001, `${key}: expected ${expected[key]}, received ${actual[key]}`);
}

function pathBounds(pathData) {
  const points = [];
  walkPathData(pathData, (_name, coordinates) => {
    for (let index = 0; index < coordinates.length; index += 2) points.push({ x: coordinates[index], y: coordinates[index + 1] });
  });
  return {
    left: Math.min(...points.map((point) => point.x)),
    top: Math.min(...points.map((point) => point.y)),
    right: Math.max(...points.map((point) => point.x)),
    bottom: Math.max(...points.map((point) => point.y))
  };
}

function walkPathData(pathData, visit) {
  for (let index = 0; index < pathData.length; ) {
    const name = pathData[index++];
    const coordinateCount = name === 1 || name === 2 ? 2 : name === 5 ? 6 : name === 7 ? 4 : name === 11 ? 0 : -1;
    assert.notEqual(coordinateCount, -1);
    const coordinates = pathData.slice(index, index + coordinateCount);
    visit(name, coordinates);
    index += coordinateCount;
  }
}