/**
 * One table covering every built-in node that has a `run`: adding a node without a case here
 * fails `covers every built-in node`. The run-less event nodes are listed in `EVENT_NODES`.
 */
import { describe, expect, it } from 'vitest';
import { BUILT_IN_NODES } from '../../src/core/graph/nodes';
import {
  createEmptyGraph,
  type DeclaredPort,
  NO_BEHAVIORS,
  type NodeContext,
  requireNodeDef,
  resolveDef,
  type RunResult,
  type Value,
} from '../../src/core/graph';
import type { PropertyBag } from '../../src/core/model/Properties';
import { fakeContext, type FakeContext, fakeEntity, fakeHandle, NO_POINTER, runDef } from '../helpers';

interface Case {
  /** What the case demonstrates – becomes the failure message. */
  name: string;
  inputs?: Record<string, Value>;
  params?: PropertyBag;
  context?: Partial<NodeContext>;
  /** Ports the node declares for itself – for the types whose ports are variables it names. */
  ports?: DeclaredPort[];
  /** Expected data outputs, compared exactly. */
  outputs?: Record<string, Value>;
  /** Exec outputs the node would have grown in a graph – only for types whose ports are derived. */
  derivedOutputs?: string[];
  /** Expected exec continuation; `null` asserts the flow ends here. */
  next?: string | string[] | null;
  /** Expected loop request; `null` asserts the node does not loop. */
  repeat?: RunResult['repeat'] | null;
  /** Expected nested-behavior call; `null` asserts the node calls nothing. */
  call?: RunResult['call'] | null;
  /** Assertions on what the node did to the context or to the handles it was given. */
  after?(ctx: FakeContext): void;
}

const run = (type: string, c: Case): { result: RunResult; ctx: FakeContext } => {
  const ctx = fakeContext(c.context);
  const node = { id: 'n', type, x: 0, y: 0, params: c.params ?? {}, ports: c.ports };
  const registered = c.ports ? resolveDef(node, createEmptyGraph(), NO_BEHAVIORS)! : requireNodeDef(type);
  const grown = (c.derivedOutputs ?? []).map((key) => ({ key, label: key, type: 'exec' as const }));
  const def = grown.length > 0 ? { ...registered, outputs: [...registered.outputs, ...grown] } : registered;
  return { result: def.run!(ctx, c.inputs ?? {}, c.params ?? {}, def), ctx };
};

const at = (name: string, x: number, y: number) => ({ ...fakeEntity(name), x, y });
const painted = fakeHandle({ width: 100, text: '' });

const pointer = (overrides: Partial<NodeContext['pointer']>): Partial<NodeContext> => ({
  pointer: { ...NO_POINTER, ...overrides },
});

const CASES: Record<string, Case[]> = {
  // flow

  Branch: [
    { name: 'true takes then', inputs: { condition: true }, next: 'then' },
    { name: 'false takes else', inputs: { condition: false }, next: 'else' },
    { name: 'a non-empty string is true', inputs: { condition: 'yes' }, next: 'then' },
    { name: '"false" as text is false', inputs: { condition: 'false' }, next: 'else' },
  ],
  Sequence: [
    { name: 'on its own it has the one output, and follows it', next: ['a'] },
    { name: 'runs every output it has grown, in order', derivedOutputs: ['b', 'c'], next: ['a', 'b', 'c'] },
  ],
  BehaviorEnd: [
    {
      name: 'hands its inputs back out, which is where the caller reads the result',
      inputs: { hit: true, damage: 7 },
      outputs: { hit: true, damage: 7 },
      next: null,
    },
  ],
  RunBehavior: [
    {
      name: 'asks for the named behavior to run, passing its inputs on',
      inputs: { power: 3 },
      params: { behavior: 'b1' },
      call: { behaviorId: 'b1', inputs: { power: 3 } },
      next: 'exec',
    },
    {
      name: 'without a behavior chosen it still continues, calling nothing that exists',
      call: { behaviorId: '', inputs: {} },
      next: 'exec',
    },
  ],
  Repeat: [
    {
      name: 'asks for as many body rounds as it was given, then continues at done',
      inputs: { times: 3 },
      repeat: { port: 'body', index: 'index', times: 3 },
      next: 'done',
    },
    {
      name: 'a fractional count is cut and a negative one runs nothing',
      inputs: { times: -2.7 },
      repeat: { port: 'body', index: 'index', times: 0 },
    },
  ],

  // variables

  // Reading needs the interpreter, which asks `read` at the moment: see variable-node.test.ts.
  Variables: [
    {
      name: 'writes the variables switched to Set, each keeping its declared type',
      ports: [
        { key: 'speed', kind: 'number', write: true },
        { key: 'lives', kind: 'number' },
      ],
      inputs: { speed: '250', lives: 9 },
      context: { variables: { speed: 100, lives: 3 } },
      next: 'exec',
      after: (ctx) => expect(ctx.variables).toEqual({ speed: 250, lives: 3 }),
    },
    {
      name: 'without a variable it writes nothing',
      next: 'exec',
      after: (ctx) => expect(ctx.variables).toEqual({ speed: 100 }),
    },
  ],
  Properties: [
    {
      name: 'writes the properties switched to Set, each keeping the type it already had',
      ports: [
        { key: 'width', kind: 'number', write: true },
        { key: 'text', kind: 'text', write: true },
        { key: 'height', kind: 'number' },
      ],
      inputs: { object: painted, width: '250', text: 7 },
      next: 'exec',
      after: () => expect(painted.props).toEqual({ width: 250, text: '7' }),
    },
    {
      name: 'no object is a no-op',
      ports: [{ key: 'width', kind: 'number', write: true }],
      inputs: { object: null, width: 5 },
      next: 'exec',
    },
  ],

  // references and properties

  Self: [{ name: 'outputs the behavior object', outputs: { object: fakeContext().self } }],
  Owner: [
    { name: 'outputs the object the behavior is parented to', outputs: { object: fakeContext().owner } },
  ],
  Parent: [
    { name: 'no object has no parent', inputs: { object: null }, outputs: { parent: null } },
    {
      name: 'a top-level object has no parent',
      inputs: { object: fakeHandle({}) },
      outputs: { parent: null },
    },
  ],
  ObjectByName: [
    {
      name: 'asks the context for the name',
      inputs: { name: 'Player' },
      context: { findByName: (name) => (name === 'Player' ? fakeEntity('Player') : null) },
      outputs: { object: fakeEntity('Player') },
    },
    { name: 'an unknown name is null', inputs: { name: 'Ghost' }, outputs: { object: null } },
  ],
  NameOf: [
    { name: 'reads the name', inputs: { object: fakeEntity('Coin') }, outputs: { name: 'Coin' } },
    { name: 'no object is the empty name', inputs: { object: null }, outputs: { name: '' } },
  ],
  IsAsset: [
    {
      name: 'matches the asset id',
      inputs: { object: fakeEntity('Coin', 0, 'coin') },
      params: { asset: 'coin' },
      outputs: { result: true },
    },
    {
      name: 'no asset chosen never matches',
      inputs: { object: fakeEntity('Coin', 0, 'coin') },
      outputs: { result: false },
    },
  ],
  IsEnabled: [
    { name: 'on by default', inputs: { object: fakeHandle({}) }, outputs: { result: true, own: true } },
    {
      name: 'own switch off',
      inputs: { object: fakeHandle({ enabled: false }) },
      outputs: { result: false, own: false },
    },
    {
      name: 'own switch on but a parent is off – "own" still reports the own switch',
      inputs: { object: fakeHandle({ enabled: true }, fakeHandle({ enabled: false })) },
      outputs: { result: false, own: true },
    },
    { name: 'no object is off', inputs: { object: null }, outputs: { result: false, own: false } },
  ],
  GetPosition: [
    {
      name: 'local and world position of a top-level object are the same',
      inputs: { object: at('A', 10, 20) },
      outputs: { x: 10, y: 20, worldX: 10, worldY: 20 },
    },
    {
      name: 'a child reports its local position and the summed world position',
      inputs: { object: { ...at('child', 10, 20), parent: at('parent', 100, 200) } },
      outputs: { x: 10, y: 20, worldX: 110, worldY: 220 },
    },
    {
      name: 'no object is the origin',
      inputs: { object: null },
      outputs: { x: 0, y: 0, worldX: 0, worldY: 0 },
    },
  ],

  // literals and math

  Number: [
    { name: 'outputs its setting', params: { value: 7.5 }, outputs: { value: 7.5 } },
    { name: 'unset is 0', outputs: { value: 0 } },
  ],
  Boolean: [
    { name: 'outputs its setting', params: { value: true }, outputs: { value: true } },
    { name: 'unset is false', outputs: { value: false } },
  ],
  String: [
    { name: 'outputs its setting', params: { value: 'hello' }, outputs: { value: 'hello' } },
    { name: 'unset is empty', outputs: { value: '' } },
  ],
  Add: [
    { name: 'adds', inputs: { a: 2, b: 3 }, outputs: { result: 5 } },
    { name: 'numeric text is coerced', inputs: { a: '2', b: 3 }, outputs: { result: 5 } },
  ],
  Subtract: [{ name: 'subtracts', inputs: { a: 2, b: 3 }, outputs: { result: -1 } }],
  Multiply: [{ name: 'multiplies', inputs: { a: 2, b: 3 }, outputs: { result: 6 } }],
  Divide: [
    { name: 'divides', inputs: { a: 6, b: 4 }, outputs: { result: 1.5 } },
    { name: 'division by zero is 0, not Infinity', inputs: { a: 6, b: 0 }, outputs: { result: 0 } },
  ],
  Min: [{ name: 'the smaller one', inputs: { a: 2, b: -3 }, outputs: { result: -3 } }],
  Max: [{ name: 'the larger one', inputs: { a: 2, b: -3 }, outputs: { result: 2 } }],
  Abs: [{ name: 'drops the sign', inputs: { value: -4 }, outputs: { result: 4 } }],
  Sqrt: [
    { name: 'square root', inputs: { value: 9 }, outputs: { result: 3 } },
    { name: 'negative input is 0, not NaN', inputs: { value: -9 }, outputs: { result: 0 } },
  ],
  Clamp: [
    {
      name: 'inside the range passes through',
      inputs: { value: 0.4, min: 0, max: 1 },
      outputs: { result: 0.4 },
    },
    { name: 'above the range', inputs: { value: 5, min: 0, max: 1 }, outputs: { result: 1 } },
    { name: 'below the range', inputs: { value: -5, min: 0, max: 1 }, outputs: { result: 0 } },
  ],
  Floor: [
    { name: 'rounds down', inputs: { value: 2.9 }, outputs: { result: 2 } },
    { name: 'rounds down for negatives too', inputs: { value: -2.1 }, outputs: { result: -3 } },
  ],
  Ceil: [
    { name: 'rounds up', inputs: { value: 2.1 }, outputs: { result: 3 } },
    { name: 'a whole number stays put', inputs: { value: 3 }, outputs: { result: 3 } },
  ],
  Round: [
    { name: 'rounds to nearest', inputs: { value: 2.4 }, outputs: { result: 2 } },
    { name: 'half rounds up', inputs: { value: 2.5 }, outputs: { result: 3 } },
    { name: 'negative half rounds towards zero', inputs: { value: -2.5 }, outputs: { result: -2 } },
  ],
  Modulo: [
    { name: 'remainder', inputs: { a: 125, b: 60 }, outputs: { result: 5 } },
    { name: 'modulo zero is 0, not NaN', inputs: { a: 125, b: 0 }, outputs: { result: 0 } },
  ],
  Random: [
    // The spread is checked in "Random stays inside [min, max)" below.
    { name: 'an empty range always yields min', inputs: { min: 3, max: 3 }, outputs: { result: 3 } },
  ],
  Time: [
    {
      name: 'reports the clock and the frame length from the context',
      context: { time: 12.5, dt: 0.016 },
      outputs: { time: 12.5, dt: 0.016 },
    },
  ],

  // text and comparison

  ToText: [
    { name: 'formats with decimals', inputs: { value: 12.345, decimals: 1 }, outputs: { text: '12.3' } },
    { name: 'text passes through unformatted', inputs: { value: 'x', decimals: 2 }, outputs: { text: 'x' } },
    { name: 'decimals are clamped to 0…10', inputs: { value: 1, decimals: -5 }, outputs: { text: '1' } },
  ],
  ToNumber: [
    { name: 'reads a text as a number', inputs: { value: '42' }, outputs: { result: 42 } },
    { name: 'a word is 0', inputs: { value: 'twelve' }, outputs: { result: 0 } },
  ],
  Substring: [
    {
      name: 'takes count characters from start',
      inputs: { text: 'abcdef', start: 2, count: 3 },
      outputs: { text: 'cde' },
    },
    {
      name: 'a negative count reaches to the end',
      inputs: { text: 'abcdef', start: 4, count: -1 },
      outputs: { text: 'ef' },
    },
    {
      name: 'asking past the end gives what is there',
      inputs: { text: 'ab', start: 1, count: 10 },
      outputs: { text: 'b' },
    },
  ],
  // lists

  List: [
    { name: 'hands out the list it was given', params: { value: [1, 2, 3] }, outputs: { value: [1, 2, 3] } },
    { name: 'an unset list is empty, not missing', outputs: { value: [] } },
  ],
  Fill: [
    { name: 'repeats one value', inputs: { value: 0, count: 4 }, outputs: { result: [0, 0, 0, 0] } },
    { name: 'a negative count gives nothing', inputs: { value: 1, count: -3 }, outputs: { result: [] } },
  ],
  Count: [
    { name: 'counts the items', inputs: { list: ['a', 'b'] }, outputs: { count: 2 } },
    { name: 'a lone value counts as one', inputs: { list: 7 }, outputs: { count: 1 } },
  ],
  ItemAt: [
    { name: 'reads by index, counting from 0', inputs: { list: [4, 5, 6], index: 1 }, outputs: { item: 5 } },
    { name: 'past the end is 0, not a crash', inputs: { list: [4], index: 9 }, outputs: { item: 0 } },
  ],
  SetItem: [
    {
      name: 'replaces one item',
      inputs: { list: [1, 2, 3], index: 1, value: 9 },
      outputs: { result: [1, 9, 3] },
    },
    {
      name: 'leaves the list it was given untouched – a graph may hold it elsewhere',
      inputs: { list: Object.freeze([1, 2, 3]), index: 0, value: 9 },
      outputs: { result: [9, 2, 3] },
    },
    {
      name: 'an index outside the list changes nothing',
      inputs: { list: [1, 2], index: 5, value: 9 },
      outputs: { result: [1, 2] },
    },
  ],
  SubList: [
    {
      name: 'takes count items from start',
      inputs: { list: [1, 2, 3, 4], start: 1, count: 2 },
      outputs: { result: [2, 3] },
    },
    {
      name: 'asking past the end gives what is there',
      inputs: { list: [1, 2], start: 1, count: 9 },
      outputs: { result: [2] },
    },
  ],
  Concat: [
    { name: 'one list after the other', inputs: { a: [1], b: [2, 3] }, outputs: { result: [1, 2, 3] } },
    { name: 'a lone value joins as one item', inputs: { a: [1], b: 2 }, outputs: { result: [1, 2] } },
  ],
  PackStruct: [
    {
      name: 'bundles its declared inputs into one value',
      inputs: { x: 2, tags: ['a', 'b'] },
      outputs: { value: { x: 2, tags: ['a', 'b'] } },
    },
    { name: 'a node with no fields yet packs nothing', outputs: { value: {} } },
    {
      name: 'an entity cannot be stored in a bundle, so it packs as its name',
      inputs: { who: fakeEntity('Player') },
      outputs: { value: { who: 'Player' } },
    },
  ],
  ExpandStruct: [
    {
      name: 'reads the fields back out, one output each',
      inputs: { value: { x: 2, tags: ['a'] } },
      outputs: { x: 2, tags: ['a'] },
    },
    { name: 'a value that is not a bundle has no fields', inputs: { value: 7 }, outputs: {} },
  ],
  IndexOf: [
    { name: 'finds where a value sits', inputs: { list: [7, 8, 9], value: 8 }, outputs: { index: 1 } },
    { name: 'a value that is not in there is -1', inputs: { list: [7], value: 8 }, outputs: { index: -1 } },
  ],

  FindText: [
    {
      name: 'finds where the search first appears',
      inputs: { text: '..#.#', search: '#' },
      outputs: { index: 2 },
    },
    {
      name: 'text that does not appear is -1',
      inputs: { text: '....', search: '#' },
      outputs: { index: -1 },
    },
  ],
  Join: [
    { name: 'sticks values together as text', inputs: { a: 'Coins: ', b: 3 }, outputs: { text: 'Coins: 3' } },
    {
      name: 'an object joins as its name',
      inputs: { a: '', b: fakeEntity('Coin') },
      outputs: { text: 'Coin' },
    },
  ],
  Equals: [
    { name: 'equal text', inputs: { a: 'a', b: 'a' }, outputs: { result: true } },
    { name: 'a number equals its text form', inputs: { a: 3, b: '3' }, outputs: { result: true } },
    { name: 'objects compare by identity, not by name', inputs: eqNamesakes(), outputs: { result: false } },
  ],
  Compare: [
    { name: 'less than', inputs: { a: 1, b: 2 }, params: { op: '<' }, outputs: { result: true } },
    { name: 'greater or equal', inputs: { a: 2, b: 2 }, params: { op: '>=' }, outputs: { result: true } },
    { name: 'not equal', inputs: { a: 2, b: 2 }, params: { op: '!=' }, outputs: { result: false } },
    {
      name: 'no operator chosen falls back to the default "<"',
      inputs: { a: 1, b: 2 },
      outputs: { result: true },
    },
  ],
  And: [
    { name: 'both true', inputs: { a: true, b: true }, outputs: { result: true } },
    { name: 'one false', inputs: { a: true, b: false }, outputs: { result: false } },
    { name: 'an unconnected input reads as false', inputs: { a: true }, outputs: { result: false } },
  ],
  Or: [
    { name: 'one true is enough', inputs: { a: false, b: true }, outputs: { result: true } },
    { name: 'both false', inputs: { a: false, b: false }, outputs: { result: false } },
  ],
  Not: [
    { name: 'inverts', inputs: { value: true }, outputs: { result: false } },
    { name: 'inverts the other way', inputs: { value: false }, outputs: { result: true } },
    { name: '"0" as text counts as false', inputs: { value: '0' }, outputs: { result: true } },
  ],

  // vectors and input

  Length: [
    { name: '3-4-5 triangle', inputs: { x: 3, y: 4 }, outputs: { result: 5 } },
    { name: 'the zero vector has length 0', inputs: { x: 0, y: 0 }, outputs: { result: 0 } },
  ],
  Normalize: [
    {
      name: 'scales to length 1 and reports the old length',
      inputs: { x: 0, y: -4 },
      outputs: { x: 0, y: -1, length: 4 },
    },
    {
      name: 'the zero vector stays zero instead of becoming NaN',
      inputs: { x: 0, y: 0 },
      outputs: { x: 0, y: 0, length: 0 },
    },
  ],
  Distance: [
    {
      name: 'distance between two objects',
      inputs: { a: at('a', 0, 0), b: at('b', 3, 4) },
      outputs: { result: 5 },
    },
    { name: 'a missing object is distance 0', inputs: { a: at('a', 0, 0), b: null }, outputs: { result: 0 } },
  ],
  AxisInput: [
    {
      name: 'one key gives a unit vector',
      context: { isKeyDown: (key) => key === 'ArrowRight' },
      outputs: { x: 1, y: 0, active: true },
    },
    {
      name: 'diagonals are normalized, so they are not faster',
      context: { isKeyDown: (key) => key === 'ArrowRight' || key === 'ArrowDown' },
      // Not Math.SQRT1_2: the node divides by Math.hypot(1, 1), which lands one ulp lower.
      outputs: { x: 1 / Math.hypot(1, 1), y: 1 / Math.hypot(1, 1), active: true },
    },
    {
      name: 'opposite keys cancel out',
      context: { isKeyDown: (key) => key === 'ArrowLeft' || key === 'ArrowRight' },
      outputs: { x: 0, y: 0, active: false },
    },
    { name: 'nothing held is inactive', outputs: { x: 0, y: 0, active: false } },
  ],
  KeyIsDown: [
    {
      name: 'asks the context for the chosen key',
      params: { key: 'a' },
      context: { isKeyDown: (k) => k === 'a' },
      outputs: { down: true },
    },
    {
      name: 'another key is not down',
      params: { key: 'b' },
      context: { isKeyDown: (k) => k === 'a' },
      outputs: { down: false },
    },
    { name: 'no key chosen is never down', context: { isKeyDown: () => true }, outputs: { down: true } },
  ],
  MousePosition: [
    {
      name: 'reports the pointer in world units',
      context: pointer({ x: 40, y: -20, inside: true }),
      outputs: { x: 40, y: -20, inside: true },
    },
    {
      name: 'outside the camera frame the position is still reported, but "in view" is false',
      context: pointer({ x: 5, y: 5, inside: false }),
      outputs: { x: 5, y: 5, inside: false },
    },
  ],
  MouseButton: [
    {
      name: 'the frame the button goes down',
      context: pointer({ down: true, pressed: true }),
      outputs: { down: true, pressed: true, released: false },
    },
    {
      name: 'a later frame while it is still held',
      context: pointer({ down: true }),
      outputs: { down: true, pressed: false, released: false },
    },
    {
      name: 'the frame it goes up',
      context: pointer({ released: true }),
      outputs: { down: false, pressed: false, released: true },
    },
  ],
  IsHovered: [
    {
      name: 'the pointer is over the object',
      inputs: { object: fakeEntity('Button') },
      context: { ...pointer({ inside: true }), hitTest: () => true },
      outputs: { result: true },
    },
    {
      name: 'a hit outside the camera frame does not count',
      inputs: { object: fakeEntity('Button') },
      context: { ...pointer({ inside: false }), hitTest: () => true },
      outputs: { result: false },
    },
    {
      name: 'no object is never hovered',
      inputs: { object: null },
      context: { ...pointer({ inside: true }), hitTest: () => true },
      outputs: { result: false },
    },
  ],
  IsTouching: [
    {
      name: 'asks the context',
      inputs: { a: fakeEntity('a'), b: fakeEntity('b') },
      context: { isTouching: () => true },
      outputs: { result: true },
    },
    {
      name: 'a missing object never touches',
      inputs: { a: fakeEntity('a'), b: null },
      context: { isTouching: () => true },
      outputs: { result: false },
    },
  ],

  // actions

  Move: [
    {
      name: 'moves by (dx, dy) × scale × dt',
      inputs: { object: at('m', 0, 0), dx: 1, dy: 0, scale: 100, dt: 0.5 },
      next: 'exec',
      outputs: { blockedX: false, blockedY: false },
    },
    {
      name: 'no object is a no-op that still continues the flow',
      inputs: { object: null, dx: 1, dy: 1 },
      next: 'exec',
      outputs: { blockedX: false, blockedY: false },
    },
  ],
  SetPosition: [
    {
      name: 'places the object and continues',
      inputs: { object: at('p', 0, 0), x: 30, y: -40 },
      next: 'exec',
    },
    { name: 'no object is a no-op', inputs: { object: null, x: 1, y: 1 }, next: 'exec' },
  ],
  Spawn: [
    {
      name: 'no asset chosen logs a hint and continues with no object',
      next: 'exec',
      outputs: { object: null },
      after: (ctx) => expect(ctx.logs).toEqual(['Spawn: no asset selected']),
    },
  ],
  Destroy: [
    {
      name: 'no object is a no-op that still continues the flow',
      inputs: { object: null },
      next: 'exec',
    },
  ],
  Log: [
    {
      name: 'logs its message and continues',
      inputs: { message: 'hi' },
      next: 'exec',
      after: (ctx) => expect(ctx.logs).toEqual(['hi']),
    },
    {
      name: 'an object logs as its name',
      inputs: { message: fakeEntity('Coin') },
      next: 'exec',
      after: (ctx) => expect(ctx.logs).toEqual(['Coin']),
    },
  ],
  StopGame: [{ name: 'ends play and the flow', next: null, after: (ctx) => expect(ctx.stopped).toBe(true) }],
  RestartGame: [{ name: 'ends the flow – the world restarts before the next tick', next: null }],
};

/** Two distinct handles that share a name – `Equals` must still tell them apart. */
function eqNamesakes(): Record<string, Value> {
  return { a: fakeEntity('Coin'), b: fakeEntity('Coin') };
}

/**
 * Nodes without a `run`: only observable through a running world, since the BehaviorSystem
 * seeds their outputs. The value names the test that drives each one.
 */
const EVENT_NODES: Record<string, string> = {
  BehaviorStart: 'nested-behavior.test.ts',
  OnStart: 'graph.test.ts',
  OnUpdate: 'graph.test.ts',
  OnKeyDown: 'behavior-events.test.ts',
  OnKeyUp: 'behavior-events.test.ts',
  OnKeyHeld: 'behavior-events.test.ts',
  OnTimer: 'behavior-events.test.ts',
  OnCollisionEnter: 'collider.test.ts',
  OnCollisionStay: 'behavior-events.test.ts',
  OnCollisionExit: 'collider.test.ts',
  OnClick: 'nodes.test.ts',
};

describe('node catalog', () => {
  it('covers every built-in node', () => {
    const uncovered = BUILT_IN_NODES.filter((def) =>
      def.run ? !CASES[def.type] : !EVENT_NODES[def.type],
    ).map((def) => def.type);
    expect(uncovered).toEqual([]);
  });

  it('lists exactly the run-less nodes as events', () => {
    const runless = BUILT_IN_NODES.filter((def) => !def.run).map((def) => def.type);
    expect(Object.keys(EVENT_NODES).sort()).toEqual(runless.sort());
  });

  it('declares well-formed ports and settings', () => {
    for (const def of BUILT_IN_NODES) {
      const keys = [...def.inputs, ...def.outputs].map((p) => p.key);
      expect(def.label, `${def.type} has a label`).not.toBe('');
      expect(def.description, `${def.type} has a description`).not.toBe('');
      // Keys are unique per side, but may repeat across sides (Normalize reads and writes x/y).
      expect(new Set(def.inputs.map((p) => p.key)).size, `${def.type} input keys unique`).toBe(
        def.inputs.length,
      );
      expect(new Set(def.outputs.map((p) => p.key)).size, `${def.type} output keys unique`).toBe(
        def.outputs.length,
      );
      expect(
        keys.every((k) => k !== ''),
        `${def.type} has no empty port key`,
      ).toBe(true);
      for (const param of def.params) {
        expect(param.default, `${def.type}.${param.key} has a default`).toBeDefined();
      }
    }
  });
});

for (const [type, cases] of Object.entries(CASES)) {
  describe(type, () => {
    for (const c of cases) {
      it(c.name, () => {
        const { result, ctx } = run(type, c);
        if (c.outputs) expect(result.outputs ?? {}).toEqual(c.outputs);
        if (c.next !== undefined) expect(result.next ?? null).toEqual(c.next);
        if (c.repeat !== undefined) expect(result.repeat ?? null).toEqual(c.repeat);
        if (c.call !== undefined) expect(result.call ?? null).toEqual(c.call);
        c.after?.(ctx);
      });
    }
  });
}

describe('action nodes write through to the object they are given', () => {
  it('Move applies dx/dy × scale × dt', () => {
    const target = at('m', 0, 0);
    runDef('Move', fakeContext(), { object: target, dx: 1, dy: -2, scale: 100, dt: 0.5 }, {});
    expect({ x: target.x, y: target.y }).toEqual({ x: 50, y: -100 });
  });

  it('SetPosition places the object absolutely', () => {
    const target = at('p', 10, 10);
    runDef('SetPosition', fakeContext(), { object: target, x: 30, y: -40 }, {});
    expect({ x: target.x, y: target.y }).toEqual({ x: 30, y: -40 });
  });

  it('Destroy hands the object to the context', () => {
    const removed: string[] = [];
    const ctx = fakeContext({ destroy: (target) => removed.push(target.name) });
    runDef('Destroy', ctx, { object: fakeEntity('Coin') }, {});
    expect(removed).toEqual(['Coin']);
  });

  it('RestartGame asks the context for a restart', () => {
    let restarted = false;
    const ctx = fakeContext({
      restart: () => {
        restarted = true;
      },
    });
    runDef('RestartGame', ctx, {}, {});
    expect(restarted).toBe(true);
  });

  it('Random stays inside [min, max) over many draws', () => {
    const ctx = fakeContext();
    const draws = Array.from(
      { length: 200 },
      () => runDef('Random', ctx, { min: 5, max: 10 }, {}).outputs!.result as number,
    );
    expect(draws.every((n) => n >= 5 && n < 10)).toBe(true);
    // Not a constant: a generator stuck on one value would pass the range check above.
    expect(new Set(draws).size).toBeGreaterThan(1);
  });
});