import assert from 'node:assert/strict';
import { readFile } from 'node:fs/promises';
import test from 'node:test';
import {
  BrowserProductClient,
  requireValue
} from '../src/transport.ts';

const fixtures = JSON.parse(
  await readFile(new URL('./fixtures/contract.json', import.meta.url), 'utf8')
);

test('transport derives routes, credentials, and encoded queries from the contract', async () => {
  const calls = [];
  const client = new BrowserProductClient(
    async (input, init) => {
      calls.push({ input: String(input), init });
      return jsonResponse(fixtures.browse_response);
    },
    'https://nuthatch.test/'
  );

  const response = requireValue(
    await client.browse({
      root: 'shared',
      prefix: '문서/a b',
      q: 'needle',
      continuation: 'next/token'
    })
  );
  assert.deepEqual(response, fixtures.browse_response);
  assert.equal(calls.length, 1);
  assert.equal(calls[0].init.credentials, 'same-origin');
  assert.equal(calls[0].init.method, 'GET');
  const url = new URL(calls[0].input);
  assert.equal(url.pathname, '/api/browse');
  assert.equal(url.searchParams.get('root'), 'shared');
  assert.equal(url.searchParams.get('prefix'), '문서/a b');
  assert.equal(url.searchParams.get('q'), 'needle');
  assert.equal(url.searchParams.get('continuation'), 'next/token');
});

test('binary upload preserves the Blob and required generated headers', async () => {
  const calls = [];
  const client = new BrowserProductClient(async (input, init) => {
    calls.push({ input: String(input), init });
    return jsonResponse(fixtures.upload_response);
  });
  const body = new Blob(['payload']);

  const response = requireValue(
    await client.upload({
      root: 'personal',
      path: 'folder/문서.txt',
      operationId: 'operation-1',
      declaredSize: body.size,
      contentSha256: 'a'.repeat(64),
      csrfToken: 'b'.repeat(43),
      body
    })
  );

  assert.deepEqual(response, fixtures.upload_response);
  assert.equal(calls.length, 1);
  assert.equal(calls[0].init.body, body);
  assert.equal(calls[0].init.headers.get('Content-Type'), 'application/octet-stream');
  assert.equal(calls[0].init.headers.get('X-Declared-Size'), '7');
  assert.equal(calls[0].init.headers.get('X-Content-SHA256'), 'a'.repeat(64));
  assert.equal(calls[0].init.headers.get('X-CSRF-Token'), 'b'.repeat(43));
  const url = new URL(calls[0].input, 'https://nuthatch.test');
  assert.equal(url.pathname, '/api/upload');
  assert.equal(url.searchParams.get('operation_id'), 'operation-1');
  assert.equal(url.searchParams.get('path'), 'folder/문서.txt');
});

test('download exposes its stream and declared response headers', async () => {
  const client = new BrowserProductClient(async () =>
    new Response(new Uint8Array([1, 2, 3]), {
      headers: {
        'Content-Disposition': 'attachment; filename="file.bin"',
        'X-Content-Type-Options': 'nosniff',
        'Content-Security-Policy': "default-src 'none'",
        'Content-Length': '3'
      }
    })
  );

  const download = requireValue(
    await client.download({ root: 'shared', path: 'file.bin' })
  );
  assert.deepEqual(
    new Uint8Array(await new Response(download.body).arrayBuffer()),
    new Uint8Array([1, 2, 3])
  );
  assert.equal(download.contentDisposition, 'attachment; filename="file.bin"');
  assert.equal(download.xContentTypeOptions, 'nosniff');
  assert.equal(download.contentSecurityPolicy, "default-src 'none'");
  assert.equal(download.contentLength, 3);
});

test('shared fixtures decode through every JSON transport method', async () => {
  const responses = [
    fixtures.session_response,
    fixtures.delete_response,
    fixtures.delete_plan_response,
    fixtures.delete_batch_response
  ];
  const client = new BrowserProductClient(async () =>
    jsonResponse(responses.shift())
  );

  assert.deepEqual(requireValue(await client.session({})), fixtures.session_response);
  assert.deepEqual(
    requireValue(await client.delete({ body: fixtures.delete_request })),
    fixtures.delete_response
  );
  assert.deepEqual(
    requireValue(
      await client.deletePlan({
        root: 'shared',
        path: 'folder/문서.txt',
        continuation: 'next-page'
      })
    ),
    fixtures.delete_plan_response
  );
  assert.deepEqual(
    requireValue(
      await client.deleteBatch({ body: fixtures.delete_batch_request })
    ),
    fixtures.delete_batch_response
  );
});

test('declared, undeclared, and network failures remain distinct without retries', async () => {
  const declaredClient = new BrowserProductClient(async () =>
    jsonResponse(
      {
        error: 'csrf_validation_failed',
        message: 'CSRF validation failed',
        details: null
      },
      403
    )
  );
  const declared = await declaredClient.delete({
    body: fixtures.delete_request
  });
  assert.equal(declared.ok, false);
  assert.equal(declared.failure.kind, 'http');
  assert.equal(declared.failure.error.error, 'csrf_validation_failed');

  const undeclaredClient = new BrowserProductClient(async () =>
    jsonResponse(
      { error: 'unknown_error', message: 'unknown', details: null },
      500
    )
  );
  const undeclared = await undeclaredClient.session({});
  assert.equal(undeclared.ok, false);
  assert.equal(undeclared.failure.kind, 'unexpected-http');

  let attempts = 0;
  const networkClient = new BrowserProductClient(async () => {
    attempts += 1;
    throw new Error('offline');
  });
  const network = await networkClient.browse({});
  assert.equal(network.ok, false);
  assert.equal(network.failure.kind, 'network');
  assert.equal(attempts, 1);
});

test('checked generated artifact contains no transport policy', async () => {
  const generated = await readFile(
    new URL('../src/generated/contract.ts', import.meta.url),
    'utf8'
  );
  assert.doesNotMatch(generated, /\bfetch\s*\(/);
  assert.doesNotMatch(generated, /\bcredentials\b/);
  assert.doesNotMatch(generated, /\bretry\b/i);
});

function jsonResponse(value, status = 200) {
  return new Response(JSON.stringify(value), {
    status,
    headers: { 'Content-Type': 'application/json' }
  });
}