import { assertEquals } from "@std/assert";
import { find, insert } from "utils/db.ts";
import { getCryptoString } from "utils/server.ts";

let testCounter = 0;

function getTestDbPath() {
  testCounter++;
  return `data/test_api_user_${testCounter}_${Date.now()}.db`;
}

function cleanup(dbPath: string) {
  try {
    Deno.removeSync(dbPath);
  } catch {
    // File may not exist
  }
}

function makeCtx(method: string, body?: object, cookie?: string) {
  const headers: Record<string, string> = { "Content-Type": "application/json" };
  if (cookie) headers["Cookie"] = cookie;
  const req = new Request("http://localhost", {
    method,
    headers,
    body: method === "GET" ? undefined : JSON.stringify(body || {}),
  });
  return { req };
}

async function seedUser(email: string, password: string) {
  const hashedPw = await getCryptoString(password, "MD5");
  const user = insert("User", {
    name: email.split("@")[0],
    email,
    password: hashedPw,
  });
  return user;
}

async function seedToken(userId: string | number) {
  const token = await getCryptoString("test-token-" + userId + Date.now(), "MD5");
  insert("Token", { token, user_id: userId });
  return token;
}

Deno.test("API user/register - successful registration", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/register.tsx");
    const ctx = makeCtx("POST", {
      email: "newuser@example.com",
      password: "password123",
    });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, true);
    assertEquals(body.data, true);

    const users = find("User", { email: "newuser@example.com" }, ["id"]);
    assertEquals(users.length, 1);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/register - missing email returns error", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/register.tsx");
    const ctx = makeCtx("POST", { password: "password123" });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/register - missing password returns error", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/register.tsx");
    const ctx = makeCtx("POST", { email: "test@example.com" });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/login - successful login", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    await seedUser("login@example.com", "mypassword");

    const { handler } = await import("../../routes/api/user/login.tsx");
    const ctx = makeCtx("POST", {
      email: "login@example.com",
      password: "mypassword",
    });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, true);
    assertEquals(body.data, true);

    const setCookie = res.headers.get("set-cookie");
    assertEquals(setCookie !== null, true);
    assertEquals(setCookie!.includes("pd-user-token="), true);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/login - wrong email returns error", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/login.tsx");
    const ctx = makeCtx("POST", {
      email: "nonexistent@example.com",
      password: "password",
    });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/login - missing fields returns error", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/login.tsx");
    const ctx = makeCtx("POST", { email: "test@example.com" });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/login GET - returns user info with valid token", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const user = await seedUser("getuser@example.com", "password");
    const userId = user[0]["id"] as string | number;
    const token = await seedToken(userId);

    const { handler } = await import("../../routes/api/user/login.tsx");
    const ctx = makeCtx("GET", undefined, `pd-user-token=${token}`);
    const res = await handler.GET!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, true);
    assertEquals(body.data.name, "getuser");
    assertEquals(body.data.email, "getuser@example.com");
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/login GET - returns error without token", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/login.tsx");
    const ctx = makeCtx("GET");
    const res = await handler.GET!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/logout - returns success and clears cookie", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/logout.tsx");
    const ctx = makeCtx("GET");
    const res = await handler.GET!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, true);

    const setCookie = res.headers.get("set-cookie");
    assertEquals(setCookie !== null, true);
    assertEquals(setCookie!.includes("pd-user-token="), true);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/reset - successful password reset", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const user = await seedUser("reset@example.com", "oldpassword");
    const userId = user[0]["id"] as string | number;
    const token = await seedToken(userId);

    const { handler } = await import("../../routes/api/user/reset.tsx");
    const ctx = makeCtx("POST", {
      old: "oldpassword",
      new: "newpassword",
    }, `pd-user-token=${token}`);
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, true);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/reset - wrong old password returns error", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const user = await seedUser("resetwrong@example.com", "oldpassword");
    const userId = user[0]["id"] as string | number;
    const token = await seedToken(userId);

    const { handler } = await import("../../routes/api/user/reset.tsx");
    const ctx = makeCtx("POST", {
      old: "wrongpassword",
      new: "newpassword",
    }, `pd-user-token=${token}`);
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});

Deno.test("API user/reset - without token returns error", async () => {
  const dbPath = getTestDbPath();
  Deno.env.set("POSTDOWN_DB_PATH", dbPath);
  try {
    const { handler } = await import("../../routes/api/user/reset.tsx");
    const ctx = makeCtx("POST", {
      old: "oldpassword",
      new: "newpassword",
    });
    const res = await handler.POST!(ctx as any);
    const body = await res.json();
    assertEquals(body.success, false);
  } finally {
    Deno.env.delete("POSTDOWN_DB_PATH");
    cleanup(dbPath);
  }
});