import assert from "node:assert/strict";
import test from "node:test";
import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { spawnSync } from "node:child_process";
import { compileCapabilityResourceSource, compileCapabilitySource } from "../src/capability-language/parser.js";
import { generateReactBindings } from "../src/bindings/react.js";
import { reactPlatformTypes } from "../src/bindings/react-platform.js";

const source = { repository: "https://example.test/fields.git", commit: "a".repeat(40) };
test("React bindings preserve read-only, writable and nested reference contracts", async (t) => {
  const iface = compileCapabilityResourceSource(
    `interface Fields id "fields" revision "fields@1" {
    value title id "title" : string { get id "title:get"; set id "title:set"; watch start id "watch" stop id "stop"; }
    value summary id "summary" : string { get id "summary:get"; }
  }`,
    { source },
  );
  assert.ok(iface.ok && iface.resource.kind === "interface");
  if (!iface.ok || iface.resource.kind !== "interface") throw new Error("interface failed");
  const pkg = compileCapabilityResourceSource(
    `import interface Fields; package P id "p" revision "p@1" {
    function props id "props" : unit -> record {fields: interface-ref<Fields>; caption: string;};
  }`,
    { source, environment: { interfaces: new Map([["Fields", iface.resource.revision]]) } },
  );
  assert.ok(pkg.ok && pkg.resource.kind === "package");
  if (!pkg.ok || pkg.resource.kind !== "package") throw new Error("package failed");
  const schema = {
    format: "quixos-bindings",
    version: 1,
    interfaces: [iface.resource.revision],
    packages: [pkg.resource.revision],
  } as const;
  const generated = generateReactBindings(
    { ...schema, interfaces: [...schema.interfaces], packages: [...schema.packages] },
    "p@1",
    ["props"],
  );
  assert.match(generated, /"title": WritableField<string>/);
  assert.match(generated, /"summary": ReadableField<string>/);
  assert.throws(
    () => generateReactBindings({ ...schema, interfaces: [], packages: [...schema.packages] }, "p@1", ["props"]),
    /Missing React reference/,
  );
  const root = await fs.mkdtemp(path.join(os.tmpdir(), "qx-react-types-"));
  t.after(() => fs.rm(root, { recursive: true, force: true }));
  await fs.writeFile(path.join(root, "react-props.gen.ts"), generated);
  await fs.writeFile(
    path.join(root, "platform.d.ts"),
    reactPlatformTypes +
      '\ndeclare module "react" {export type ReactNode = unknown; export type CSSProperties = {}; export function createElement(...args: unknown[]): unknown;}\n',
  );
  await fs.writeFile(
    path.join(root, "consumer.ts"),
    `import {useLiveField, type ReadableField, type WritableField} from "@quixos/web-studio-react-runtime";
import type {ReactResults} from "./react-props.gen.js";
declare const props: ReactResults["props"];
const [title, setTitle] = useLiveField(props.fields.fields.title);
setTitle("new");
// @ts-expect-error wrong setter value
setTitle(123);
// @ts-expect-error read-only hook has no setter
const [summary, setSummary] = useLiveField(props.fields.fields.summary);
const [manual, write] = useLiveField(props.fields.fields.summary, {write: async (value: string) => {}});
write("new");
const readonly: ReadableField<string> = props.fields.fields.title;
// @ts-expect-error read-only does not satisfy writable
const writable: WritableField<string> = props.fields.fields.summary;
declare const narrow: WritableField<"only">;
// @ts-expect-error writable references are invariant
const widened: WritableField<string> = narrow;
// @ts-expect-error callbacks must accept the field's type
useLiveField(props.fields.fields.summary, {write: async (value: number) => {}});
`,
  );
  const result = spawnSync(
    process.execPath,
    [
      path.resolve("node_modules/typescript/bin/tsc"),
      "--strict",
      "--noEmit",
      "--skipLibCheck",
      "--target",
      "ES2022",
      path.join(root, "platform.d.ts"),
      path.join(root, "consumer.ts"),
    ],
    { encoding: "utf8", cwd: root },
  );
  assert.equal(result.status, 0, result.stdout + result.stderr);
  await fs.writeFile(
    path.join(root, "react-props.gen.ts"),
    generateReactBindings(
      { ...schema, interfaces: [...schema.interfaces], packages: [...schema.packages] },
      "p@1",
      ["props"],
      [{ module: "./component.js", propsExport: "props" }],
    ),
  );
  const checkComponent = () =>
    spawnSync(
      process.execPath,
      [
        path.resolve("node_modules/typescript/bin/tsc"),
        "--strict",
        "--noEmit",
        "--skipLibCheck",
        "--target",
        "ES2022",
        path.join(root, "platform.d.ts"),
        path.join(root, "react-props.gen.ts"),
        path.join(root, "component.ts"),
      ],
      { encoding: "utf8", cwd: root },
    );
  await fs.writeFile(
    path.join(root, "component.ts"),
    'import type {ReactResults} from "./react-props.gen.js"; export default function Component(props: {camino: ReactResults["props"]}) {return null;}',
  );
  const matching = checkComponent();
  assert.equal(matching.status, 0, matching.stdout + matching.stderr);
  await fs.writeFile(
    path.join(root, "component.ts"),
    'import type {WritableField} from "@quixos/web-studio-react-runtime"; export default function Component(props: {camino: {fields: {fields: {summary: WritableField<string>}}}}) {return null;}',
  );
  const incompatible = checkComponent();
  assert.notEqual(incompatible.status, 0, "component cannot strengthen a read-only prop into a writable field");
  assert.match(incompatible.stdout + incompatible.stderr, /writable|WritableField/);
});

test("class factories specialize return types and reject instance implementations or mismatched inputs", () => {
  const factory = compileCapabilityResourceSource(
    'interface Factory<object T> id "factory" revision "factory@1" {static operation create id "create" : unit -> ref<T> {call id "call";}}',
    { source },
  );
  assert.ok(factory.ok && factory.resource.kind === "interface");
  if (!factory.ok || factory.resource.kind !== "interface") throw new Error("factory failed");
  const factoryRevision = factory.resource.revision;
  const compile = (declaration: string) => {
    const pkg = compileCapabilityResourceSource(
      `external atom Note id "note"; package P id "p" revision "p@1" {${declaration}}`,
      { source },
    );
    assert.ok(pkg.ok && pkg.resource.kind === "package", JSON.stringify(pkg.diagnostics));
    if (!pkg.ok || pkg.resource.kind !== "package") throw new Error("package failed");
    return compileCapabilitySource(
      `workspace W id "w" revision "w@1" commit "${source.commit}" {
      atom Note id "note"; import interface Factory; import package P;
      conform Note as Factory<atom Note> id "factory-conformance" {bind create.call to package P.make;}
    }`,
      "workspace.qx",
      { interfaces: new Map([["Factory", factoryRevision]]), packages: new Map([["P", pkg.resource.revision]]) },
    );
  };
  const good = compile('function make id "make" : unit -> atom-ref<Note>;');
  assert.ok(good.ok, JSON.stringify(good.diagnostics));
  assert.equal(good.workspace.interfaceImports[0].members[0].operations[0].scope, "class");
  const wrongInput = compile('function make id "make" : string -> atom-ref<Note>;');
  assert.equal(wrongInput.ok, false);
  const wrongReceiver = compile('operation make id "make" : unit -> atom-ref<Note> mode call receiver atom Note;');
  assert.equal(wrongReceiver.ok, false);
  assert.match(JSON.stringify(wrongReceiver.diagnostics), /free function/);
});

test("state-field shorthand binds exactly the declared accessors, never invents writes", () => {
  const iface = compileCapabilityResourceSource(
    'interface Reader id "reader" revision "reader@1" {value title id "title" : string {get id "get"; watch start id "watch" stop id "stop";}}',
    { source },
  );
  assert.ok(iface.ok && iface.resource.kind === "interface");
  if (!iface.ok || iface.resource.kind !== "interface") throw new Error("interface failed");
  const result = compileCapabilitySource(
    `workspace W id "w" revision "w@1" commit "${source.commit}" {
    atom Note id "note"; import interface Reader;
    conform Note as Reader id "reader-conformance" {private state Title id "title-slot" on Note : string policy crdt(string) default ""; bind title to state Title;}
  }`,
    "workspace.qx",
    { interfaces: new Map([["Reader", iface.resource.revision]]) },
  );
  assert.ok(result.ok, JSON.stringify(result.diagnostics));
  assert.deepEqual(
    result.workspace.conformances[0].operationBindings.map((binding) => binding.operationId),
    ["get", "watch", "stop"],
  );
});