import { describe, expect, it } from 'vitest';
import { buildAsset } from '../../src/core/commands/assetCommands';
import { CommandStack } from '../../src/core/commands/CommandStack';
import { AddNodeCommand, ConnectCommand, DisconnectCommand, RemoveNodeCommand, SetNodeParamCommand } from '../../src/core/commands/graphCommands';
import { PlaceAssetCommand, SetOwnerCommand } from '../../src/core/commands/sceneObjectCommands';
import { AddVariableCommand, RemoveVariableCommand, RenameVariableCommand } from '../../src/core/commands/variableCommands';
import { type EntityHandle, GraphInterpreter, type NodeContext, allNodeDefs, portsCompatible } from '../../src/core/graph';
import type { BehaviorAsset } from '../../src/core/model/Asset';
import { createEmptyProject } from '../../src/core/model/Project';
import { deserializeProject, serializeProject } from '../../src/core/store/serialize';

function entity(name: string, x = 0): EntityHandle {
  return { id: name, name, x, y: 0, z: 0, props: {} };
}

function context(overrides: Partial<NodeContext> = {}): NodeContext & { logs: string[]; stopped: boolean } {
  const logs: string[] = [];
  const ctx = {
    self: entity('self'),
    owner: entity('owner'),
    variables: { speed: 100 },
    time: 0,
    dt: 0.5,
    logs,
    stopped: false,
    findByName: () => null,
    isKeyDown: () => false,
    log: (m: string) => logs.push(m),
    destroy: () => {},
    stop: () => { ctx.stopped = true; },
    ...overrides,
  };
  return ctx;
}

/** Builds "On key held → Move(owner, dx = speed × dt)" through commands, like the editor would. */
function buildMoverProject() {
  const project = createEmptyProject('p', 'P');
  const behavior = buildAsset('behavior', 'Mover', 'mover') as BehaviorAsset;
  project.assets.push(behavior);
  const stack = new CommandStack(project);
  stack.execute(new AddVariableCommand('mover', 'speed', 'number'));
  const held = new AddNodeCommand('mover', 'OnKeyHeld', 0, 0, { key: 'ArrowRight' });
  const owner = new AddNodeCommand('mover', 'Owner', 0, 100);
  const speed = new AddNodeCommand('mover', 'GetVariable', 0, 200, { variable: 'speed' });
  const mul = new AddNodeCommand('mover', 'Multiply', 200, 150);
  const move = new AddNodeCommand('mover', 'Move', 400, 0);
  for (const c of [held, owner, speed, mul, move]) stack.execute(c);
  stack.execute(new ConnectCommand('mover', { node: held.node.id, port: 'exec' }, { node: move.node.id, port: 'exec' }));
  stack.execute(new ConnectCommand('mover', { node: owner.node.id, port: 'object' }, { node: move.node.id, port: 'object' }));
  stack.execute(new ConnectCommand('mover', { node: speed.node.id, port: 'value' }, { node: mul.node.id, port: 'a' }));
  stack.execute(new ConnectCommand('mover', { node: held.node.id, port: 'dt' }, { node: mul.node.id, port: 'b' }));
  stack.execute(new ConnectCommand('mover', { node: mul.node.id, port: 'result' }, { node: move.node.id, port: 'dx' }));
  return { project, behavior, stack, nodes: { held, owner, speed, mul, move } };
}

describe('node registry', () => {
  it('registers the built-in node set with well-formed ports', () => {
    const defs = allNodeDefs();
    expect(defs.length).toBeGreaterThan(20);
    for (const def of defs) {
      const keys = [...def.inputs, ...def.outputs].map((p) => p.key);
      expect(new Set(def.inputs.map((p) => p.key)).size).toBe(def.inputs.length);
      expect(new Set(def.outputs.map((p) => p.key)).size).toBe(def.outputs.length);
      if (def.category === 'event') expect(def.inputs).toHaveLength(0);
      else expect(def.run).toBeTypeOf('function');
      expect(keys.every((k) => k.length > 0)).toBe(true);
    }
  });

  it('type-checks port connections', () => {
    expect(portsCompatible('exec', 'exec')).toBe(true);
    expect(portsCompatible('exec', 'number')).toBe(false);
    expect(portsCompatible('number', 'any')).toBe(true);
    expect(portsCompatible('any', 'boolean')).toBe(true);
    expect(portsCompatible('number', 'boolean')).toBe(false);
    expect(portsCompatible('object', 'object')).toBe(true);
  });
});

describe('GraphInterpreter', () => {
  it('runs an event pulse and pulls data lazily (speed × dt moves the owner)', () => {
    const { behavior } = buildMoverProject();
    const interpreter = new GraphInterpreter(behavior.graph);
    const ctx = context({ variables: { speed: 100 } });
    const fired = interpreter.fire('OnKeyHeld', ctx, { dt: 0.5 }, (n) => n.params.key === 'ArrowRight');
    expect(fired).toBe(1);
    expect(ctx.owner!.x).toBe(50);
    expect(interpreter.fire('OnKeyHeld', ctx, { dt: 0.5 }, (n) => n.params.key === 'ArrowLeft')).toBe(0);
    expect(ctx.owner!.x).toBe(50);
  });

  it('uses inline values for unconnected inputs', () => {
    const project = createEmptyProject('p', 'P');
    const behavior = buildAsset('behavior', 'B', 'b') as BehaviorAsset;
    project.assets.push(behavior);
    const stack = new CommandStack(project);
    const start = new AddNodeCommand('b', 'OnStart', 0, 0);
    const self = new AddNodeCommand('b', 'Self', 0, 0);
    const move = new AddNodeCommand('b', 'Move', 0, 0, { dx: 7, dy: -3 });
    for (const c of [start, self, move]) stack.execute(c);
    stack.execute(new ConnectCommand('b', { node: start.node.id, port: 'exec' }, { node: move.node.id, port: 'exec' }));
    stack.execute(new ConnectCommand('b', { node: self.node.id, port: 'object' }, { node: move.node.id, port: 'object' }));
    const ctx = context();
    new GraphInterpreter(behavior.graph).fire('OnStart', ctx);
    expect(ctx.self.x).toBe(7);
    expect(ctx.self.y).toBe(-3);
  });

  it('follows Branch, writes variables and logs', () => {
    const project = createEmptyProject('p', 'P');
    const behavior = buildAsset('behavior', 'B', 'b') as BehaviorAsset;
    project.assets.push(behavior);
    const stack = new CommandStack(project);
    stack.execute(new AddVariableCommand('b', 'count', 'number'));
    const start = new AddNodeCommand('b', 'OnStart', 0, 0);
    const get = new AddNodeCommand('b', 'GetVariable', 0, 0, { variable: 'count' });
    const cmp = new AddNodeCommand('b', 'Compare', 0, 0, { op: '<', b: 3 });
    const branch = new AddNodeCommand('b', 'Branch', 0, 0);
    const add = new AddNodeCommand('b', 'Add', 0, 0, { b: 1 });
    const set = new AddNodeCommand('b', 'SetVariable', 0, 0, { variable: 'count' });
    const logThen = new AddNodeCommand('b', 'Log', 0, 0, { message: 'then' });
    const logElse = new AddNodeCommand('b', 'Log', 0, 0, { message: 'else' });
    for (const c of [start, get, cmp, branch, add, set, logThen, logElse]) stack.execute(c);
    const connect = (from: AddNodeCommand, fp: string, to: AddNodeCommand, tp: string) =>
      stack.execute(new ConnectCommand('b', { node: from.node.id, port: fp }, { node: to.node.id, port: tp }));
    connect(start, 'exec', branch, 'exec');
    connect(get, 'value', cmp, 'a');
    connect(cmp, 'result', branch, 'condition');
    connect(branch, 'then', set, 'exec');
    connect(get, 'value', add, 'a');
    connect(add, 'result', set, 'value');
    connect(set, 'exec', logThen, 'exec');
    connect(branch, 'else', logElse, 'exec');

    const interpreter = new GraphInterpreter(behavior.graph);
    const ctx = context({ variables: { count: 0 } });
    for (let i = 0; i < 5; i++) interpreter.fire('OnStart', ctx);
    expect(ctx.variables.count).toBe(3);
    expect(ctx.logs).toEqual(['then', 'then', 'then', 'else', 'else']);
  });

  it('reports traversed edges and nodes to the trace listener', () => {
    const { behavior, nodes } = buildMoverProject();
    const interpreter = new GraphInterpreter(behavior.graph);
    const edges: string[] = [];
    const visited: string[] = [];
    interpreter.trace = { onEdge: (id) => edges.push(id), onNode: (id) => visited.push(id) };
    interpreter.fire('OnKeyHeld', context(), { dt: 1 });
    expect(edges).toHaveLength(1);
    expect(visited).toContain(nodes.mul.node.id);
    expect(visited).toContain(nodes.move.node.id);
  });

  it('stops a runaway flow instead of hanging', () => {
    const project = createEmptyProject('p', 'P');
    const behavior = buildAsset('behavior', 'B', 'b') as BehaviorAsset;
    project.assets.push(behavior);
    const stack = new CommandStack(project);
    const start = new AddNodeCommand('b', 'OnStart', 0, 0);
    const a = new AddNodeCommand('b', 'Sequence', 0, 0);
    const b = new AddNodeCommand('b', 'Sequence', 0, 0);
    for (const c of [start, a, b]) stack.execute(c);
    stack.execute(new ConnectCommand('b', { node: start.node.id, port: 'exec' }, { node: a.node.id, port: 'exec' }));
    stack.execute(new ConnectCommand('b', { node: a.node.id, port: 'a' }, { node: b.node.id, port: 'exec' }));
    stack.execute(new ConnectCommand('b', { node: b.node.id, port: 'a' }, { node: a.node.id, port: 'exec' }));
    expect(() => new GraphInterpreter(behavior.graph).fire('OnStart', context())).toThrow(/step limit/);
  });
});

describe('graph commands', () => {
  it('rejects incompatible, self and duplicate connections', () => {
    const { stack, nodes } = buildMoverProject();
    expect(() => stack.execute(new ConnectCommand('mover', { node: nodes.held.node.id, port: 'exec' }, { node: nodes.mul.node.id, port: 'a' }))).toThrow(/Cannot connect/);
    expect(() => stack.execute(new ConnectCommand('mover', { node: nodes.mul.node.id, port: 'result' }, { node: nodes.mul.node.id, port: 'a' }))).toThrow(/itself/);
    expect(() => stack.execute(new ConnectCommand('mover', { node: nodes.held.node.id, port: 'exec' }, { node: nodes.move.node.id, port: 'exec' }))).toThrow(/Already/);
    expect(() => stack.execute(new ConnectCommand('mover', { node: nodes.held.node.id, port: 'nope' }, { node: nodes.move.node.id, port: 'exec' }))).toThrow(/Port/);
  });

  it('replaces the edge of a data input and restores it on undo', () => {
    const { behavior, stack, nodes } = buildMoverProject();
    const literal = new AddNodeCommand('mover', 'Number', 0, 0, { value: 9 });
    stack.execute(literal);
    const before = behavior.graph.edges.length;
    stack.execute(new ConnectCommand('mover', { node: literal.node.id, port: 'value' }, { node: nodes.move.node.id, port: 'dx' }));
    expect(behavior.graph.edges.length).toBe(before); // one replaced, one added
    expect(behavior.graph.edges.find((e) => e.to.node === nodes.move.node.id && e.to.port === 'dx')!.from.node).toBe(literal.node.id);
    stack.undo();
    expect(behavior.graph.edges.find((e) => e.to.node === nodes.move.node.id && e.to.port === 'dx')!.from.node).toBe(nodes.mul.node.id);
  });

  it('removing a node drops its edges; undo restores both', () => {
    const { behavior, stack, nodes } = buildMoverProject();
    const edgesBefore = behavior.graph.edges.length;
    stack.execute(new RemoveNodeCommand('mover', nodes.mul.node.id));
    expect(behavior.graph.nodes.some((n) => n.id === nodes.mul.node.id)).toBe(false);
    expect(behavior.graph.edges.length).toBe(edgesBefore - 3);
    stack.undo();
    expect(behavior.graph.nodes.some((n) => n.id === nodes.mul.node.id)).toBe(true);
    expect(behavior.graph.edges.length).toBe(edgesBefore);
    stack.execute(new DisconnectCommand('mover', behavior.graph.edges[0]!.id));
    expect(behavior.graph.edges.length).toBe(edgesBefore - 1);
    stack.undo();
    expect(behavior.graph.edges.length).toBe(edgesBefore);
  });

  it('coerces declared params and keeps inline input values', () => {
    const { behavior, stack, nodes } = buildMoverProject();
    stack.execute(new SetNodeParamCommand('mover', nodes.held.node.id, 'key', 'ArrowLeft'));
    stack.execute(new SetNodeParamCommand('mover', nodes.move.node.id, 'dy', 4));
    const held = behavior.graph.nodes.find((n) => n.id === nodes.held.node.id)!;
    const move = behavior.graph.nodes.find((n) => n.id === nodes.move.node.id)!;
    expect(held.params.key).toBe('ArrowLeft');
    expect(move.params.dy).toBe(4);
    stack.undo();
    expect(move.params.dy).toBeUndefined();
  });
});

describe('variables', () => {
  it('adds, renames (including graph references and overrides) and removes variables', () => {
    const { project, behavior, stack, nodes } = buildMoverProject();
    const scene = buildAsset('scene', 'S', 's');
    project.assets.push(scene);
    const place = new PlaceAssetCommand('s', 'mover', { x: 0, y: 0 });
    stack.execute(place);
    const object = (scene as { objects: { id: string; overrides: Record<string, unknown> }[] }).objects[0]!;
    object.overrides.speed = 5;

    stack.execute(new RenameVariableCommand('mover', 'speed', 'velocity'));
    expect(behavior.variables[0]!.key).toBe('velocity');
    expect(behavior.props).toEqual({ velocity: 0 });
    expect(object.overrides).toEqual({ velocity: 5 });
    expect(behavior.graph.nodes.find((n) => n.id === nodes.speed.node.id)!.params.variable).toBe('velocity');
    stack.undo();
    expect(behavior.variables[0]!.key).toBe('speed');
    expect(object.overrides).toEqual({ speed: 5 });

    expect(() => stack.execute(new AddVariableCommand('mover', 'speed', 'number'))).toThrow(/already/);
    expect(() => stack.execute(new AddVariableCommand('mover', '1bad', 'number'))).toThrow(/names/);

    stack.execute(new RemoveVariableCommand('mover', 'speed'));
    expect(behavior.variables).toHaveLength(0);
    expect(object.overrides).toEqual({});
    stack.undo();
    expect(behavior.variables).toHaveLength(1);
    expect(object.overrides).toEqual({ speed: 5 });
  });

  it('owner references are validated and cleared when the owner disappears', () => {
    const project = createEmptyProject('p', 'P');
    const scene = buildAsset('scene', 'S', 's');
    const sprite = buildAsset('sprite', 'Box', 'box');
    const behavior = buildAsset('behavior', 'B', 'b');
    project.assets.push(scene, sprite, behavior);
    const stack = new CommandStack(project);
    const placeBox = new PlaceAssetCommand('s', 'box', { x: 0, y: 0 });
    const placeB = new PlaceAssetCommand('s', 'b', { x: 0, y: 0 });
    stack.execute(placeBox);
    stack.execute(placeB);
    expect(() => stack.execute(new SetOwnerCommand('s', placeB.objectId, placeB.objectId))).toThrow(/itself/);
    stack.execute(new SetOwnerCommand('s', placeB.objectId, placeBox.objectId));
    const objects = () => (project.assets[0] as { objects: { id: string; ownerId: string }[] }).objects;
    expect(objects()[1]!.ownerId).toBe(placeBox.objectId);
    // Round trip keeps the owner; a dangling owner is dropped by the loader.
    const loaded = deserializeProject(serializeProject(project));
    expect((loaded.assets[0] as { objects: { ownerId: string }[] }).objects[1]!.ownerId).toBe(placeBox.objectId);
    const raw = serializeProject(project) as { assets: { objects?: { ownerId: string }[] }[] };
    raw.assets[0]!.objects![1]!.ownerId = 'ghost';
    expect((deserializeProject(raw).assets[0] as { objects: { ownerId: string }[] }).objects[1]!.ownerId).toBe('');
  });
});

describe('behavior serialization', () => {
  it('round-trips variables and graph, dropping unknown node types and dangling edges', () => {
    const { project, behavior } = buildMoverProject();
    const loaded = deserializeProject(serializeProject(project)).assets.find((a) => a.id === 'mover') as BehaviorAsset;
    expect(loaded.variables).toEqual(behavior.variables);
    expect(loaded.graph).toEqual(behavior.graph);
    expect(loaded.props).toEqual({ speed: 0 });

    const raw = serializeProject(project) as { assets: { graph?: { nodes: unknown[]; edges: unknown[] } }[] };
    raw.assets[0]!.graph!.nodes.push({ id: 'zzz', type: 'DoesNotExist', x: 0, y: 0, params: {} });
    raw.assets[0]!.graph!.edges.push({ id: 'e-bad', from: { node: 'zzz', port: 'exec' }, to: { node: behavior.graph.nodes[0]!.id, port: 'exec' } });
    const cleaned = deserializeProject(raw).assets[0] as BehaviorAsset;
    expect(cleaned.graph.nodes.length).toBe(behavior.graph.nodes.length);
    expect(cleaned.graph.edges.length).toBe(behavior.graph.edges.length);
  });
});