// 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

const { Buffer } = Deno;
import { test, runIfMain } from "../testing/mod.ts";
import { assertEquals } from "../testing/asserts.ts";
import { Response, ServerRequest, writeResponse } from "./server.ts";
import { BufReader, BufWriter } from "../io/bufio.ts";
import { StringReader } from "../io/readers.ts";

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

const enc = new TextEncoder();
const dec = new TextDecoder();

type Handler = () => void;

const responseTests: ResponseTest[] = [
  // Default response
  {
    response: {},
    raw: "HTTP/1.1 200 OK\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(async function responseWrite(): 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 = {
      localAddr: "",
      remoteAddr: "",
      rid: -1,
      closeRead: (): void => {},
      closeWrite: (): void => {},
      read: async (): Promise<Deno.ReadResult> => {
        return { eof: true, nread: 0 };
      },
      write: async (): Promise<number> => {
        return -1;
      },
      close: (): void => {}
    };

    await request.respond(testCase.response);
    assertEquals(buf.toString(), testCase.raw);
    await request.done;
  }
});

test(async function requestBodyWithContentLength(): Promise<void> {
  {
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("content-length", "5");
    const buf = new Buffer(enc.encode("Hello"));
    req.r = new BufReader(buf);
    const body = dec.decode(await 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(enc.encode(longText));
    req.r = new BufReader(buf);
    const body = dec.decode(await req.body());
    assertEquals(body, longText);
  }
});

test(async function requestBodyWithTransferEncoding(): 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(enc.encode(chunksData));
    req.r = new BufReader(buf);
    const body = dec.decode(await 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(enc.encode(chunksData));
    req.r = new BufReader(buf);
    const body = dec.decode(await req.body());
    assertEquals(body, longText);
  }
});

test(async function requestBodyStreamWithContentLength(): Promise<void> {
  {
    const shortText = "Hello";
    const req = new ServerRequest();
    req.headers = new Headers();
    req.headers.set("content-length", "" + shortText.length);
    const buf = new Buffer(enc.encode(shortText));
    req.r = new BufReader(buf);
    const it = await req.bodyStream();
    let offset = 0;
    for await (const chunk of it) {
      const s = dec.decode(chunk);
      assertEquals(shortText.substr(offset, s.length), s);
      offset += s.length;
    }
  }

  // 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(enc.encode(longText));
    req.r = new BufReader(buf);
    const it = await req.bodyStream();
    let offset = 0;
    for await (const chunk of it) {
      const s = dec.decode(chunk);
      assertEquals(longText.substr(offset, s.length), s);
      offset += s.length;
    }
  }
});

test(async function requestBodyStreamWithTransferEncoding(): 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(enc.encode(chunksData));
    req.r = new BufReader(buf);
    const it = await req.bodyStream();
    let offset = 0;
    for await (const chunk of it) {
      const s = dec.decode(chunk);
      assertEquals(shortText.substr(offset, s.length), s);
      offset += s.length;
    }
  }

  // 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(enc.encode(chunksData));
    req.r = new BufReader(buf);
    const it = await req.bodyStream();
    let offset = 0;
    for await (const chunk of it) {
      const s = dec.decode(chunk);
      assertEquals(longText.substr(offset, s.length), s);
      offset += s.length;
    }
  }
});

test(async function writeUint8ArrayResponse(): Promise<void> {
  const shortText = "Hello";

  const body = new TextEncoder().encode(shortText);
  const res: Response = { body };

  const buf = new Deno.Buffer();
  await writeResponse(buf, res);

  const decoder = new TextDecoder("utf-8");
  const reader = new BufReader(buf);

  let line: Uint8Array;
  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), "HTTP/1.1 200 OK");

  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), `content-length: ${shortText.length}`);

  line = (await reader.readLine())[0];
  assertEquals(line.byteLength, 0);

  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), shortText);

  line = (await reader.readLine())[0];
  assertEquals(line.byteLength, 0);
});

test(async function writeStringReaderResponse(): Promise<void> {
  const shortText = "Hello";

  const body = new StringReader(shortText);
  const res: Response = { body };

  const buf = new Deno.Buffer();
  await writeResponse(buf, res);

  const decoder = new TextDecoder("utf-8");
  const reader = new BufReader(buf);

  let line: Uint8Array;
  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), "HTTP/1.1 200 OK");

  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), "transfer-encoding: chunked");

  line = (await reader.readLine())[0];
  assertEquals(line.byteLength, 0);

  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), shortText.length.toString());

  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), shortText);

  line = (await reader.readLine())[0];
  assertEquals(decoder.decode(line), "0");
});

runIfMain(import.meta);