// @ts-nocheck
import { file, gc, serve, ServeOptions } from "bun";
import { afterAll, afterEach, describe, expect, it, test } from "bun:test";
import { readFileSync } from "fs";

var port = 4021;

{
  const BodyMixin = [
    Request.prototype.arrayBuffer,
    Request.prototype.blob,
    Request.prototype.text,
    Request.prototype.json,
  ];
  const useRequestObjectValues = [true, false];

  for (let RequestPrototypeMixin of BodyMixin) {
    for (let useRequestObject of useRequestObjectValues) {
      describe(`Request.prototoype.${RequestPrototypeMixin.name}() ${
        useRequestObject ? "fetch(req)" : "fetch(url)"
      }`, () => {
        const inputFixture = [
          [JSON.stringify("Hello World"), JSON.stringify("Hello World")],
          [
            JSON.stringify("Hello World 123"),
            Buffer.from(JSON.stringify("Hello World 123")).buffer,
          ],
          [
            JSON.stringify("Hello World 456"),
            Buffer.from(JSON.stringify("Hello World 456")),
          ],
          [
            JSON.stringify(
              "EXTREMELY LONG VERY LONG STRING WOW SO LONG YOU WONT BELIEVE IT! ".repeat(
                100,
              ),
            ),
            Buffer.from(
              JSON.stringify(
                "EXTREMELY LONG VERY LONG STRING WOW SO LONG YOU WONT BELIEVE IT! ".repeat(
                  100,
                ),
              ),
            ),
          ],
          [
            JSON.stringify(
              "EXTREMELY LONG 🔥 UTF16 🔥 VERY LONG STRING WOW SO LONG YOU WONT BELIEVE IT! ".repeat(
                100,
              ),
            ),
            Buffer.from(
              JSON.stringify(
                "EXTREMELY LONG 🔥 UTF16 🔥 VERY LONG STRING WOW SO LONG YOU WONT BELIEVE IT! ".repeat(
                  100,
                ),
              ),
            ),
          ],
        ];

        for (const [name, input] of inputFixture) {
          test(`${name.slice(
            0,
            Math.min(name.length ?? name.byteLength, 64),
          )}`, async () => {
            await runInServer(
              {
                async fetch(req) {
                  var result = await RequestPrototypeMixin.call(req);
                  if (RequestPrototypeMixin === Request.prototype.json) {
                    result = JSON.stringify(result);
                  }
                  if (typeof result === "string") {
                    expect(result.length).toBe(name.length);
                    expect(result).toBe(name);
                  } else if (result && result instanceof Blob) {
                    expect(result.size).toBe(
                      new TextEncoder().encode(name).byteLength,
                    );
                    expect(await result.text()).toBe(name);
                  } else {
                    expect(result.byteLength).toBe(
                      Buffer.from(input).byteLength,
                    );
                    expect(Bun.SHA1.hash(result, "base64")).toBe(
                      Bun.SHA1.hash(input, "base64"),
                    );
                  }
                  return new Response(result, {
                    headers: req.headers,
                  });
                },
              },
              async (url) => {
                var response;

                // once, then batch of 5

                if (useRequestObject) {
                  response = await fetch(
                    new Request({
                      body: input,
                      method: "POST",
                      url: url,
                      headers: {
                        "content-type": "text/plain",
                      },
                    }),
                  );
                } else {
                  response = await fetch(url, {
                    body: input,
                    method: "POST",
                    headers: {
                      "content-type": "text/plain",
                    },
                  });
                }

                expect(response.status).toBe(200);
                expect(response.headers.get("content-length")).toBe(
                  String(Buffer.from(input).byteLength),
                );
                expect(response.headers.get("content-type")).toBe("text/plain");
                expect(await response.text()).toBe(name);

                var promises = new Array(5);
                for (let i = 0; i < 5; i++) {
                  if (useRequestObject) {
                    promises[i] = await fetch(
                      new Request({
                        body: input,
                        method: "POST",
                        url: url,
                        headers: {
                          "content-type": "text/plain",
                          "x-counter": i,
                        },
                      }),
                    );
                  } else {
                    promises[i] = await fetch(url, {
                      body: input,
                      method: "POST",
                      headers: {
                        "content-type": "text/plain",
                        "x-counter": i,
                      },
                    });
                  }
                }

                const results = await Promise.all(promises);
                for (let i = 0; i < 5; i++) {
                  const response = results[i];
                  expect(response.status).toBe(200);
                  expect(response.headers.get("content-length")).toBe(
                    String(Buffer.from(input).byteLength),
                  );
                  expect(response.headers.get("content-type")).toBe(
                    "text/plain",
                  );
                  expect(response.headers.get("x-counter")).toBe(String(i));
                  expect(await response.text()).toBe(name);
                }
              },
            );
          });
        }
      });
    }
  }
}

var existingServer;
async function runInServer(
  opts: ServeOptions,
  cb: (url: string) => void | Promise<void>,
) {
  var server;
  const handler = {
    ...opts,
    port: port++,
    fetch(req) {
      try {
        return opts.fetch(req);
      } catch (e) {
        console.error(e.message);
        console.log(e.stack);
        throw e;
      }
    },
    error(err) {
      console.log(err.message);
      console.log(err.stack);
      throw err;
    },
  };

  if (!existingServer) {
    existingServer = server = Bun.serve(handler);
  } else {
    server = existingServer;
    server.reload(handler);
  }

  try {
    await cb(`http://${server.hostname}:${server.port}`);
  } catch (e) {
    throw e;
  } finally {
  }
}

afterAll(() => {
  existingServer && existingServer.close();
  existingServer = null;
});

function fillRepeating(dstBuffer, start, end) {
  let len = dstBuffer.length,
    sLen = end - start,
    p = sLen;
  while (p < len) {
    if (p + sLen > len) sLen = len - p;
    dstBuffer.copyWithin(p, start, sLen);
    p += sLen;
    sLen <<= 1;
  }
}

function gc() {
  Bun.gc(true);
}

describe("reader", function () {
  try {
    // - empty
    // - 1 byte
    // - less than the InlineBlob limit
    // - multiple chunks
    // - backpressure
    for (let inputLength of [
      0,
      1,
      2,
      12,
      95,
      1024,
      1024 * 1024,
      1024 * 1024 * 2,
    ]) {
      var bytes = new Uint8Array(inputLength);
      {
        const chunk = Math.min(bytes.length, 256);
        for (var i = 0; i < chunk; i++) {
          bytes[i] = 255 - i;
        }
      }

      if (bytes.length > 255) fillRepeating(bytes, 0, bytes.length);

      for (const huge_ of [
        bytes,
        bytes.buffer,
        new DataView(bytes.buffer),
        new Int8Array(bytes),
        new Blob([bytes]),

        new Uint16Array(bytes),
        new Uint32Array(bytes),
        new Float64Array(bytes),

        new Int16Array(bytes),
        new Int32Array(bytes),
        new Float32Array(bytes),

        // make sure we handle subarray() as expected when reading
        // typed arrays from native code
        new Int16Array(bytes).subarray(1),
        new Int16Array(bytes).subarray(0, new Int16Array(bytes).byteLength - 1),
        new Int32Array(bytes).subarray(1),
        new Int32Array(bytes).subarray(0, new Int32Array(bytes).byteLength - 1),
        new Float32Array(bytes).subarray(1),
        new Float32Array(bytes).subarray(
          0,
          new Float32Array(bytes).byteLength - 1,
        ),
        new Int16Array(bytes).subarray(0, 1),
        new Int32Array(bytes).subarray(0, 1),
        new Float32Array(bytes).subarray(0, 1),
      ]) {
        gc();
        const thisArray = huge_;
        it(`works with ${thisArray.constructor.name}(${
          thisArray.byteLength ?? thisArray.size
        }:${inputLength}) via req.body.getReader() in chunks`, async () => {
          var huge = thisArray;
          var called = false;
          gc();

          const expectedHash =
            huge instanceof Blob
              ? Bun.SHA1.hash(
                  new Uint8Array(await huge.arrayBuffer()),
                  "base64",
                )
              : Bun.SHA1.hash(huge, "base64");
          const expectedSize =
            huge instanceof Blob ? huge.size : huge.byteLength;

          const out = await runInServer(
            {
              async fetch(req) {
                try {
                  expect(req.headers.get("x-custom")).toBe("hello");
                  expect(req.headers.get("content-type")).toBe("text/plain");
                  expect(req.headers.get("user-agent")).toBe(
                    navigator.userAgent,
                  );

                  gc();
                  expect(req.headers.get("x-custom")).toBe("hello");
                  expect(req.headers.get("content-type")).toBe("text/plain");
                  expect(req.headers.get("user-agent")).toBe(
                    navigator.userAgent,
                  );

                  var reader = req.body.getReader();
                  called = true;
                  var buffers = [];
                  while (true) {
                    var { done, value } = await reader.read();
                    if (done) break;
                    buffers.push(value);
                  }
                  const out = new Blob(buffers);
                  gc();
                  expect(out.size).toBe(expectedSize);
                  expect(Bun.SHA1.hash(await out.arrayBuffer(), "base64")).toBe(
                    expectedHash,
                  );
                  expect(req.headers.get("x-custom")).toBe("hello");
                  expect(req.headers.get("content-type")).toBe("text/plain");
                  expect(req.headers.get("user-agent")).toBe(
                    navigator.userAgent,
                  );
                  gc();
                  return new Response(out, {
                    headers: req.headers,
                  });
                } catch (e) {
                  console.error(e);
                  throw e;
                }
              },
            },
            async (url) => {
              gc();
              const response = await fetch(url, {
                body: huge,
                method: "POST",
                headers: {
                  "content-type": "text/plain",
                  "x-custom": "hello",
                  "x-typed-array": thisArray.constructor.name,
                },
              });
              huge = undefined;
              expect(response.status).toBe(200);
              const response_body = new Uint8Array(
                await response.arrayBuffer(),
              );

              expect(response_body.byteLength).toBe(expectedSize);
              expect(Bun.SHA1.hash(response_body, "base64")).toBe(expectedHash);

              gc();
              expect(response.headers.get("content-type")).toBe("text/plain");
              gc();
            },
          );
          expect(called).toBe(true);
          gc();
          return out;
        });

        for (let isDirectStream of [true, false]) {
          const positions = ["begin", "end"];
          const inner = (thisArray) => {
            for (let position of positions) {
              it(`streaming back ${thisArray.constructor.name}(${
                thisArray.byteLength ?? thisArray.size
              }:${inputLength}) starting request.body.getReader() at ${position}`, async () => {
                var huge = thisArray;
                var called = false;
                gc();

                const expectedHash =
                  huge instanceof Blob
                    ? Bun.SHA1.hash(
                        new Uint8Array(await huge.arrayBuffer()),
                        "base64",
                      )
                    : Bun.SHA1.hash(huge, "base64");
                const expectedSize =
                  huge instanceof Blob ? huge.size : huge.byteLength;

                const out = await runInServer(
                  {
                    async fetch(req) {
                      try {
                        var reader;

                        if (position === "begin") {
                          reader = req.body.getReader();
                        }

                        if (position === "end") {
                          await 1;
                          reader = req.body.getReader();
                        }

                        expect(req.headers.get("x-custom")).toBe("hello");
                        expect(req.headers.get("content-type")).toBe(
                          "text/plain",
                        );
                        expect(req.headers.get("user-agent")).toBe(
                          navigator.userAgent,
                        );

                        gc();
                        expect(req.headers.get("x-custom")).toBe("hello");
                        expect(req.headers.get("content-type")).toBe(
                          "text/plain",
                        );
                        expect(req.headers.get("user-agent")).toBe(
                          navigator.userAgent,
                        );

                        const direct = {
                          type: "direct",
                          async pull(controller) {
                            while (true) {
                              const { done, value } = await reader.read();
                              if (done) {
                                called = true;
                                controller.end();

                                return;
                              }
                              controller.write(value);
                            }
                          },
                        };

                        const web = {
                          async pull(controller) {
                            while (true) {
                              const { done, value } = await reader.read();
                              if (done) {
                                called = true;
                                controller.close();
                                return;
                              }
                              controller.enqueue(value);
                            }
                          },
                        };

                        return new Response(
                          new ReadableStream(isDirectStream ? direct : web),
                          {
                            headers: req.headers,
                          },
                        );
                      } catch (e) {
                        console.error(e);
                        throw e;
                      }
                    },
                  },
                  async (url) => {
                    gc();
                    const response = await fetch(url, {
                      body: huge,
                      method: "POST",
                      headers: {
                        "content-type": "text/plain",
                        "x-custom": "hello",
                        "x-typed-array": thisArray.constructor.name,
                      },
                    });
                    huge = undefined;
                    expect(response.status).toBe(200);
                    const response_body = new Uint8Array(
                      await response.arrayBuffer(),
                    );

                    expect(response_body.byteLength).toBe(expectedSize);
                    expect(Bun.SHA1.hash(response_body, "base64")).toBe(
                      expectedHash,
                    );

                    gc();
                    if (!response.headers.has("content-type")) {
                      console.error(
                        Object.fromEntries(response.headers.entries()),
                      );
                    }

                    expect(response.headers.get("content-type")).toBe(
                      "text/plain",
                    );
                    gc();
                  },
                );
                expect(called).toBe(true);
                gc();
                return out;
              });
            }
          };

          if (isDirectStream) {
            describe(" direct stream", () => inner(thisArray));
          } else {
            describe("default stream", () => inner(thisArray));
          }
        }
      }
    }
  } catch (e) {
    console.error(e);
    throw e;
  }
});