import { beforeAll, afterAll, describe, expect, it } from "vitest";
import Fastify from "fastify";
import Redis from "ioredis";

process.env.REDIS_REST_TOKEN = "test-token";
process.env.INTERNAL_REDIS_URL = process.env.INTERNAL_REDIS_URL || "redis://127.0.0.1:6379";

const redis = new Redis(process.env.INTERNAL_REDIS_URL, {
  lazyConnect: true,
  maxRetriesPerRequest: 1,
  commandTimeout: 2000,
});

const BLOCKED_COMMANDS = new Set([
  "flushall", "config", "shutdown", "save", "bgsave", "client", "monitor",
  "debug", "cluster", "replicaof", "slaveof", "replconf", "pfdebug",
]);

const ALLOWED_COMMANDS = new Set([
  "get", "set", "del", "exists", "expire", "ttl", "incr", "decr",
  "mget", "mset", "hget", "hset", "hdel", "hgetall",
  "lpush", "rpush", "lpop", "rpop", "lrange",
  "sadd", "srem", "smembers",
  "zadd", "zrem", "zrange",
  "ping",
  "scan", "keys", "flushdb", "setex", "psetex", "getdel", "getex",
  "zcard", "zscore", "zrevrange",
  "xadd", "xread",
  "setnx", "getset", "append", "strlen", "incrby", "decrby",
  "expireat", "pexpire", "pttl", "persist",
  "rename", "type", "lindex", "llen", "lrem", "ltrim",
  "hexists", "hincrby", "hkeys", "hvals", "hlen", "hmget", "hmset",
  "sismember", "scard", "sdiff", "sinter", "sunion",
  "zrank", "zcount", "zremrangebyrank", "zremrangebyscore",
  "srandmember", "spop",
]);

function formatResult(raw) {
  if (raw === null || raw === undefined) return null;
  if (typeof raw === "bigint") return Number(raw);
  if (Buffer.isBuffer(raw)) return raw.toString("utf-8");
  if (Array.isArray(raw)) return raw.map(formatResult);
  return raw;
}

async function executeCommand(raw) {
  if (!Array.isArray(raw) || raw.length === 0) return { error: "Invalid command format" };
  const cmd = String(raw[0]).toLowerCase();
  const args = raw.slice(1).map(String);
  if (BLOCKED_COMMANDS.has(cmd)) return { error: `Command '${cmd.toUpperCase()}' is blocked` };
  if (!ALLOWED_COMMANDS.has(cmd)) return { error: `Unsupported command: ${cmd.toUpperCase()}` };
  try {
    const result = await redis.call(cmd, ...args);
    return { result: formatResult(result) };
  } catch (err) {
    return { error: err.message };
  }
}

function isAuthed(request) {
  const header = request.headers.authorization;
  if (!header) return false;
  const m = header.match(/^Bearer\s+(.+)$/i);
  return m ? m[1] === process.env.REDIS_REST_TOKEN : false;
}

function buildApp() {
  const app = Fastify({ bodyLimit: 1024 * 1024 });

  app.get("/health", async () => {
    try {
      await redis.ping();
      return { status: "ok", redis: "connected" };
    } catch {
      return { status: "error", redis: "disconnected" };
    }
  });

  app.get("/", async () => ({ service: "hf-redis-rest", status: "running" }));

  app.get("/:command/*", async (request, reply) => {
    if (!isAuthed(request)) return reply.code(401).send({ error: "Unauthorized" });
    const parts = request.url.slice(1).split("/").filter(Boolean);
    return executeCommand(parts);
  });

  app.post("/pipeline", async (request, reply) => {
    if (!isAuthed(request)) return reply.code(401).send({ error: "Unauthorized" });
    if (!Array.isArray(request.body)) return reply.code(400).send({ error: "Request body must be an array of commands" });
    const results = [];
    for (const cmd of request.body) results.push(await executeCommand(cmd));
    return results;
  });

  app.post("/", async (request, reply) => {
    if (!isAuthed(request)) return reply.code(401).send({ error: "Unauthorized" });
    if (!request.body) return { service: "hf-redis-rest", status: "running" };
    if (!Array.isArray(request.body)) return reply.code(400).send({ error: "Request body must be a JSON array" });
    return executeCommand(request.body);
  });

  return app;
}

describe("hf-redis-rest", () => {
  let app;

  beforeAll(async () => {
    await redis.connect();
    await redis.flushdb();
    app = buildApp();
    await app.ready();
  });

  afterAll(async () => {
    await app.close();
    await redis.quit();
  });

  it("serves service info at root", async () => {
    const res = await app.inject({ method: "GET", url: "/" });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual({ service: "hf-redis-rest", status: "running" });
  });

  it("serves health without auth", async () => {
    const res = await app.inject({ method: "GET", url: "/health" });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual({ status: "ok", redis: "connected" });
  });

  it("rejects missing token", async () => {
    const res = await app.inject({ method: "POST", url: "/", headers: { "content-type": "application/json" }, payload: ["PING"] });
    expect(res.statusCode).toBe(401);
    expect(res.json()).toEqual({ error: "Unauthorized" });
  });

  it("rejects wrong token", async () => {
    const res = await app.inject({
      method: "POST",
      url: "/",
      headers: { authorization: "Bearer nope", "content-type": "application/json" },
      payload: ["PING"],
    });
    expect(res.statusCode).toBe(401);
  });

  it("supports PING, SET, GET, DEL", async () => {
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["PING"] })).json()).toEqual({ result: "PONG" });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["SET", "hello", "world"] })).json()).toEqual({ result: "OK" });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["GET", "hello"] })).json()).toEqual({ result: "world" });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["DEL", "hello"] })).json()).toEqual({ result: 1 });
  });

  it("supports expiration and ttl", async () => {
    await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["SET", "tmp", "v"] });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["EXPIRE", "tmp", "60"] })).json()).toEqual({ result: 1 });
    const ttl = (await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["TTL", "tmp"] })).json();
    expect(ttl.result).toBeGreaterThanOrEqual(0);
    await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["DEL", "tmp", "counter"] });
  });

  it("supports hashes, lists, sets, and sorted sets", async () => {
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["HSET", "h", "field", "value"] })).json()).toEqual({ result: 1 });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["HGET", "h", "field"] })).json()).toEqual({ result: "value" });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["LPUSH", "l", "one", "two"] })).json()).toEqual({ result: 2 });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["LRANGE", "l", "0", "-1"] })).json()).toEqual({ result: ["two", "one"] });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["SADD", "s", "a", "b"] })).json()).toEqual({ result: 2 });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["SMEMBERS", "s"] })).json()).toEqual({ result: ["a", "b"] });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["ZADD", "z", "1", "x", "2", "y"] })).json()).toEqual({ result: 2 });
    expect((await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["ZRANGE", "z", "0", "-1"] })).json()).toEqual({ result: ["x", "y"] });
  });

  it("supports pipeline", async () => {
    const res = await app.inject({
      method: "POST",
      url: "/pipeline",
      headers: { authorization: "Bearer test-token", "content-type": "application/json" },
      payload: [["SET", "p", "1"], ["GET", "p"]],
    });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual([{ result: "OK" }, { result: "1" }]);
  });

  it("supports path-style commands", async () => {
    await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["SET", "pathkey", "value"] });
    const res = await app.inject({ method: "GET", url: "/get/pathkey", headers: { authorization: "Bearer test-token" } });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual({ result: "value" });
  });

  it("blocks dangerous commands", async () => {
    const res = await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["FLUSHALL"] });
    expect(res.json()).toEqual({ error: "Command 'FLUSHALL' is blocked" });
  });

  it("rejects unsupported commands", async () => {
    const res = await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: ["NOPE"] });
    expect(res.json()).toEqual({ error: "Unsupported command: NOPE" });
  });

  it("rejects invalid body shapes", async () => {
    const res = await app.inject({ method: "POST", url: "/", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: { a: 1 } });
    expect(res.statusCode).toBe(400);
  });

  it("returns error for invalid pipeline body", async () => {
    const res = await app.inject({ method: "POST", url: "/pipeline", headers: { authorization: "Bearer test-token", "content-type": "application/json" }, payload: { a: 1 } });
    expect(res.statusCode).toBe(400);
  });
});