// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Ported from
// https://github.com/golang/go/blob/master/src/net/http/responsewrite_test.go

import { TextProtoReader } from "../textproto/mod.ts";
import {
  assert,
  assertEquals,
  assertMatch,
  assertStrContains,
  assertThrowsAsync,
} from "../testing/asserts.ts";
import { Response, ServerRequest, Server, serve } from "./server.ts";
import { BufReader, BufWriter } from "../io/bufio.ts";
import { delay } from "../async/delay.ts";
import { encode, decode } from "../encoding/utf8.ts";
import { mockConn } from "./_mock_conn.ts";

const { Buffer, test } = Deno;

interface ResponseTest {
  response: Response;
  raw: string;
}

const responseTests: ResponseTest[] = [
  // Default response
  {
    response: {},
    raw: "HTTP/1.1 200 OK\r\n" + "content-length: 0" + "\r\n\r\n",
  },
  // Empty body with status
  {
    response: {
      status: 404,
    },
    raw: "HTTP/1.1 404 Not Found\r\n" + "content-length: 0" + "\r\n\r\n",
  },
  // HTTP/1.1, chunked coding; empty trailer; close
  {
    response: {
      status: 200,
      body: new Buffer(new TextEncoder().encode("abcdef")),
    },

    raw:
      "HTTP/1.1 200 OK\r\n" +
      "transfer-encoding: chunked\r\n\r\n" +
      "6\r\nabcdef\r\n0\r\n\r\n",
  },
];

test("responseWrite", async function (): Promise<void> {
  for (const testCase of responseTests) {
    const buf = new Buffer();
    const bufw = new BufWriter(buf);
    const request = new ServerRequest();
    request.w = bufw;

    request.conn = mockConn();

    await request.respond(testCase.response);
    assertEquals(new TextDecoder().decode(buf.bytes()), testCase.raw);
    await request.done;
  }
});

test("requestContentLength", function (): void {
  // Has content length
  {
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("content-length", "5");
    const buf = new Buffer(encode("Hello"));
    req.r = new BufReader(buf);
    assertEquals(req.contentLength, 5);
  }
  // No content length
  {
    const shortText = "Hello";
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("transfer-encoding", "chunked");
    let chunksData = "";
    let chunkOffset = 0;
    const maxChunkSize = 70;
    while (chunkOffset < shortText.length) {
      const chunkSize = Math.min(maxChunkSize, shortText.length - chunkOffset);
      chunksData += `${chunkSize.toString(16)}\r\n${shortText.substr(
        chunkOffset,
        chunkSize
      )}\r\n`;
      chunkOffset += chunkSize;
    }
    chunksData += "0\r\n\r\n";
    const buf = new Buffer(encode(chunksData));
    req.r = new BufReader(buf);
    assertEquals(req.contentLength, null);
  }
});

interface TotalReader extends Deno.Reader {
  total: number;
}
function totalReader(r: Deno.Reader): TotalReader {
  let _total = 0;
  async function read(p: Uint8Array): Promise<number | null> {
    const result = await r.read(p);
    if (typeof result === "number") {
      _total += result;
    }
    return result;
  }
  return {
    read,
    get total(): number {
      return _total;
    },
  };
}
test("requestBodyWithContentLength", async function (): Promise<void> {
  {
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("content-length", "5");
    const buf = new Buffer(encode("Hello"));
    req.r = new BufReader(buf);
    const body = decode(await Deno.readAll(req.body));
    assertEquals(body, "Hello");
  }

  // Larger than internal buf
  {
    const longText = "1234\n".repeat(1000);
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("Content-Length", "5000");
    const buf = new Buffer(encode(longText));
    req.r = new BufReader(buf);
    const body = decode(await Deno.readAll(req.body));
    assertEquals(body, longText);
  }
  // Handler ignored to consume body
});
test("ServerRequest.finalize() should consume unread body / content-length", async () => {
  const text = "deno.land";
  const req = new ServerRequest();
  req.headers = new Headers();
  req.headers.set("content-length", "" + text.length);
  const tr = totalReader(new Buffer(encode(text)));
  req.r = new BufReader(tr);
  req.w = new BufWriter(new Buffer());
  await req.respond({ status: 200, body: "ok" });
  assertEquals(tr.total, 0);
  await req.finalize();
  assertEquals(tr.total, text.length);
});
test("ServerRequest.finalize() should consume unread body / chunked, trailers", async () => {
  const text = [
    "5",
    "Hello",
    "4",
    "Deno",
    "0",
    "",
    "deno: land",
    "node: js",
    "",
    "",
  ].join("\r\n");
  const req = new ServerRequest();
  req.headers = new Headers();
  req.headers.set("transfer-encoding", "chunked");
  req.headers.set("trailer", "deno,node");
  const body = encode(text);
  const tr = totalReader(new Buffer(body));
  req.r = new BufReader(tr);
  req.w = new BufWriter(new Buffer());
  await req.respond({ status: 200, body: "ok" });
  assertEquals(tr.total, 0);
  assertEquals(req.headers.has("trailer"), true);
  assertEquals(req.headers.has("deno"), false);
  assertEquals(req.headers.has("node"), false);
  await req.finalize();
  assertEquals(tr.total, body.byteLength);
  assertEquals(req.headers.has("trailer"), false);
  assertEquals(req.headers.get("deno"), "land");
  assertEquals(req.headers.get("node"), "js");
});
test("requestBodyWithTransferEncoding", async function (): Promise<void> {
  {
    const shortText = "Hello";
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("transfer-encoding", "chunked");
    let chunksData = "";
    let chunkOffset = 0;
    const maxChunkSize = 70;
    while (chunkOffset < shortText.length) {
      const chunkSize = Math.min(maxChunkSize, shortText.length - chunkOffset);
      chunksData += `${chunkSize.toString(16)}\r\n${shortText.substr(
        chunkOffset,
        chunkSize
      )}\r\n`;
      chunkOffset += chunkSize;
    }
    chunksData += "0\r\n\r\n";
    const buf = new Buffer(encode(chunksData));
    req.r = new BufReader(buf);
    const body = decode(await Deno.readAll(req.body));
    assertEquals(body, shortText);
  }

  // Larger than internal buf
  {
    const longText = "1234\n".repeat(1000);
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("transfer-encoding", "chunked");
    let chunksData = "";
    let chunkOffset = 0;
    const maxChunkSize = 70;
    while (chunkOffset < longText.length) {
      const chunkSize = Math.min(maxChunkSize, longText.length - chunkOffset);
      chunksData += `${chunkSize.toString(16)}\r\n${longText.substr(
        chunkOffset,
        chunkSize
      )}\r\n`;
      chunkOffset += chunkSize;
    }
    chunksData += "0\r\n\r\n";
    const buf = new Buffer(encode(chunksData));
    req.r = new BufReader(buf);
    const body = decode(await Deno.readAll(req.body));
    assertEquals(body, longText);
  }
});

test("requestBodyReaderWithContentLength", async function (): Promise<void> {
  {
    const shortText = "Hello";
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("content-length", "" + shortText.length);
    const buf = new Buffer(encode(shortText));
    req.r = new BufReader(buf);
    const readBuf = new Uint8Array(6);
    let offset = 0;
    while (offset < shortText.length) {
      const nread = await req.body.read(readBuf);
      assert(nread !== null);
      const s = decode(readBuf.subarray(0, nread as number));
      assertEquals(shortText.substr(offset, nread as number), s);
      offset += nread as number;
    }
    const nread = await req.body.read(readBuf);
    assertEquals(nread, null);
  }

  // Larger than given buf
  {
    const longText = "1234\n".repeat(1000);
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("Content-Length", "5000");
    const buf = new Buffer(encode(longText));
    req.r = new BufReader(buf);
    const readBuf = new Uint8Array(1000);
    let offset = 0;
    while (offset < longText.length) {
      const nread = await req.body.read(readBuf);
      assert(nread !== null);
      const s = decode(readBuf.subarray(0, nread as number));
      assertEquals(longText.substr(offset, nread as number), s);
      offset += nread as number;
    }
    const nread = await req.body.read(readBuf);
    assertEquals(nread, null);
  }
});

test("requestBodyReaderWithTransferEncoding", async function (): Promise<void> {
  {
    const shortText = "Hello";
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("transfer-encoding", "chunked");
    let chunksData = "";
    let chunkOffset = 0;
    const maxChunkSize = 70;
    while (chunkOffset < shortText.length) {
      const chunkSize = Math.min(maxChunkSize, shortText.length - chunkOffset);
      chunksData += `${chunkSize.toString(16)}\r\n${shortText.substr(
        chunkOffset,
        chunkSize
      )}\r\n`;
      chunkOffset += chunkSize;
    }
    chunksData += "0\r\n\r\n";
    const buf = new Buffer(encode(chunksData));
    req.r = new BufReader(buf);
    const readBuf = new Uint8Array(6);
    let offset = 0;
    while (offset < shortText.length) {
      const nread = await req.body.read(readBuf);
      assert(nread !== null);
      const s = decode(readBuf.subarray(0, nread as number));
      assertEquals(shortText.substr(offset, nread as number), s);
      offset += nread as number;
    }
    const nread = await req.body.read(readBuf);
    assertEquals(nread, null);
  }

  // Larger than internal buf
  {
    const longText = "1234\n".repeat(1000);
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("transfer-encoding", "chunked");
    let chunksData = "";
    let chunkOffset = 0;
    const maxChunkSize = 70;
    while (chunkOffset < longText.length) {
      const chunkSize = Math.min(maxChunkSize, longText.length - chunkOffset);
      chunksData += `${chunkSize.toString(16)}\r\n${longText.substr(
        chunkOffset,
        chunkSize
      )}\r\n`;
      chunkOffset += chunkSize;
    }
    chunksData += "0\r\n\r\n";
    const buf = new Buffer(encode(chunksData));
    req.r = new BufReader(buf);
    const readBuf = new Uint8Array(1000);
    let offset = 0;
    while (offset < longText.length) {
      const nread = await req.body.read(readBuf);
      assert(nread !== null);
      const s = decode(readBuf.subarray(0, nread as number));
      assertEquals(longText.substr(offset, nread as number), s);
      offset += nread as number;
    }
    const nread = await req.body.read(readBuf);
    assertEquals(nread, null);
  }
});

test({
  name: "destroyed connection",
  // FIXME(bartlomieju): hangs on windows, cause can't do `Deno.kill`
  ignore: true,
  fn: async (): Promise<void> => {
    // Runs a simple server as another process
    const p = Deno.run({
      cmd: [Deno.execPath(), "--allow-net", "http/testdata/simple_server.ts"],
      stdout: "piped",
    });

    let serverIsRunning = true;
    const statusPromise = p
      .status()
      .then((): void => {
        serverIsRunning = false;
      })
      .catch((_): void => {}); // Ignores the error when closing the process.

    try {
      const r = new TextProtoReader(new BufReader(p.stdout!));
      const s = await r.readLine();
      assert(s !== null && s.includes("server listening"));
      await delay(100);
      // Reqeusts to the server and immediately closes the connection
      const conn = await Deno.connect({ port: 4502 });
      await conn.write(new TextEncoder().encode("GET / HTTP/1.0\n\n"));
      conn.close();
      // Waits for the server to handle the above (broken) request
      await delay(100);
      assert(serverIsRunning);
    } finally {
      // Stops the sever and allows `p.status()` promise to resolve
      Deno.kill(p.pid, Deno.Signal.SIGKILL);
      await statusPromise;
      p.stdout!.close();
      p.close();
    }
  },
});

test({
  name: "serveTLS",
  // FIXME(bartlomieju): hangs on windows, cause can't do `Deno.kill`
  ignore: true,
  fn: async (): Promise<void> => {
    // Runs a simple server as another process
    const p = Deno.run({
      cmd: [
        Deno.execPath(),
        "--allow-net",
        "--allow-read",
        "http/testdata/simple_https_server.ts",
      ],
      stdout: "piped",
    });

    let serverIsRunning = true;
    const statusPromise = p
      .status()
      .then((): void => {
        serverIsRunning = false;
      })
      .catch((_): void => {}); // Ignores the error when closing the process.

    try {
      const r = new TextProtoReader(new BufReader(p.stdout!));
      const s = await r.readLine();
      assert(
        s !== null && s.includes("server listening"),
        "server must be started"
      );
      // Requests to the server and immediately closes the connection
      const conn = await Deno.connectTls({
        hostname: "localhost",
        port: 4503,
        certFile: "http/testdata/tls/RootCA.pem",
      });
      await Deno.writeAll(
        conn,
        new TextEncoder().encode("GET / HTTP/1.0\r\n\r\n")
      );
      const res = new Uint8Array(100);
      const nread = await conn.read(res);
      assert(nread !== null);
      conn.close();
      const resStr = new TextDecoder().decode(res.subarray(0, nread));
      assert(resStr.includes("Hello HTTPS"));
      assert(serverIsRunning);
    } finally {
      // Stops the sever and allows `p.status()` promise to resolve
      Deno.kill(p.pid, Deno.Signal.SIGKILL);
      await statusPromise;
      p.stdout!.close();
      p.close();
    }
  },
});

test("close server while iterating", async (): Promise<void> => {
  const server = serve(":8123");
  const nextWhileClosing = server[Symbol.asyncIterator]().next();
  server.close();
  assertEquals(await nextWhileClosing, { value: undefined, done: true });

  const nextAfterClosing = server[Symbol.asyncIterator]().next();
  assertEquals(await nextAfterClosing, { value: undefined, done: true });
});

test({
  name: "[http] close server while connection is open",
  async fn(): Promise<void> {
    async function iteratorReq(server: Server): Promise<void> {
      for await (const req of server) {
        await req.respond({ body: new TextEncoder().encode(req.url) });
      }
    }

    const server = serve(":8123");
    const p = iteratorReq(server);
    const conn = await Deno.connect({ hostname: "127.0.0.1", port: 8123 });
    await Deno.writeAll(
      conn,
      new TextEncoder().encode("GET /hello HTTP/1.1\r\n\r\n")
    );
    const res = new Uint8Array(100);
    const nread = await conn.read(res);
    assert(nread !== null);
    const resStr = new TextDecoder().decode(res.subarray(0, nread));
    assertStrContains(resStr, "/hello");
    server.close();
    await p;
    // Client connection should still be open, verify that
    // it's visible in resource table.
    const resources = Deno.resources();
    assertEquals(resources[conn.rid], "tcpStream");
    conn.close();
  },
});

test({
  name: "respond error closes connection",
  async fn(): Promise<void> {
    const serverRoutine = async (): Promise<void> => {
      const server = serve(":8124");
      // @ts-ignore
      for await (const req of server) {
        await assertThrowsAsync(async () => {
          await req.respond({
            status: 12345,
            body: new TextEncoder().encode("Hello World"),
          });
        }, Deno.errors.InvalidData);
        // The connection should be destroyed
        assert(!(req.conn.rid in Deno.resources()));
        server.close();
      }
    };
    const p = serverRoutine();
    const conn = await Deno.connect({
      hostname: "127.0.0.1",
      port: 8124,
    });
    await Deno.writeAll(
      conn,
      new TextEncoder().encode("GET / HTTP/1.1\r\n\r\n")
    );
    conn.close();
    await p;
  },
});

test({
  name: "[http] request error gets 400 response",
  async fn(): Promise<void> {
    const server = serve(":8124");
    const entry = server[Symbol.asyncIterator]().next();
    const conn = await Deno.connect({
      hostname: "127.0.0.1",
      port: 8124,
    });
    await Deno.writeAll(
      conn,
      encode("GET / HTTP/1.1\r\nmalformedHeader\r\n\r\n\r\n\r\n")
    );
    const responseString = decode(await Deno.readAll(conn));
    assertMatch(
      responseString,
      /^HTTP\/1\.1 400 Bad Request\r\ncontent-length: \d+\r\n\r\n.*\r\n\r\n$/ms
    );
    conn.close();
    server.close();
    assert((await entry).done);
  },
});