"use strict"

const chai = require("chai")
const assert = chai.assert
const nock = require("nock") // HTTP mocking
const sinon = require("sinon")

// Used for debugging.
const util = require("util")
util.inspect.defaultOptions = { depth: 1 }

// Mocking data.
const { mockReq, mockRes, mockNext } = require("./mocks/express-mocks")

// Libraries under test
const RateLimits = require("../../src/middleware/route-ratelimit")
let rateLimits = new RateLimits()
let rateLimitMiddleware = rateLimits.routeRateLimit

const controlRoute = require("../../src/routes/v3/full-node/control")
const jwtAuth = require("../../src/middleware/jwt-auth")

let req, res, next
let originalEnvVars // Used during transition from integration to unit tests.

// JWT token used in tests.
const jwt = `eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjVkYWRlM2Y1NzM5ZTZjMGZmMDM0YjlhMSIsImlhdCI6MTU3MTY3NzQ1MCwiZXhwIjoxNTc0MjY5NDUwfQ.SSz7F7ETyBB3eoNG2VKCzPOhddtB-vrtmEoj7PxicrQ`

describe("#route-ratelimits & jwt-auth", () => {
  let sandbox

  before(() => {
    // Save existing environment variables.
    originalEnvVars = {
      BITCOINCOM_BASEURL: process.env.BITCOINCOM_BASEURL,
      RPC_BASEURL: process.env.RPC_BASEURL,
      RPC_USERNAME: process.env.RPC_USERNAME,
      RPC_PASSWORD: process.env.RPC_PASSWORD
    }

    if (!process.env.JWT_AUTH_SERVER)
      process.env.JWT_AUTH_SERVER = `http://fakeurl.com/`
  })

  // Setup the mocks before each test.
  beforeEach(() => {
    // Mock the req and res objects used by Express routes.
    req = Object.assign({}, mockReq)
    res = Object.assign({}, mockRes)
    next = mockNext

    // Explicitly reset the parmas and body.
    req.params = {}
    req.body = {}
    req.query = {}

    sandbox = sinon.createSandbox()
  })

  afterEach(() => {
    sandbox.restore()
  })

  after(() => {
    rateLimits.closeRedis()
  })

  describe("#jwt-auth.js", () => {
    describe("#getTokenFromHeaders", () => {
      it(`should populate the req.locals object correctly`, () => {
        // Initialize req.locals
        req.locals = {
          proLimit: false,
          apiLevel: 0
        }

        const header = `Token ${jwt}`
        req.headers.authorization = header

        jwtAuth.getTokenFromHeaders(req, res, next)

        // console.log(`req.locals: ${JSON.stringify(req.locals, null, 2)}`)

        assert.property(req.locals, "proLimit")
        assert.property(req.locals, "apiLevel")
        assert.property(req.locals, "jwtToken")
        assert.equal(req.locals.jwtToken, jwt)
      })
    })
  })

  describe("#routeRateLimit", () => {
    rateLimitMiddleware = new RateLimits()
    let routeRateLimit = rateLimitMiddleware.routeRateLimit
    const getInfo = controlRoute.testableComponents.getInfo

    it("should pass through rate-limit middleware", async () => {
      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.method = "GET"

      // Call the route twice to trigger the rate handling.
      await routeRateLimit(req, res, next)
      await routeRateLimit(req, res, next)

      // next() will be called if rate-limit is not triggered
      assert.equal(next.called, true)
    })

    it("should trigger rate-limit handler if rate limits exceeds 5 request per minute", async () => {
      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.method = "GET"

      for (let i = 0; i < 5; i++) {
        next.reset() // reset the stubbed next() function.

        await routeRateLimit(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        false,
        `next should not be called if rate limit was triggered.`
      )
    })

    it("should NOT trigger rate-limit for free-tier at 5 RPM", async () => {
      // Clear the require cache before running this test.
      // delete require.cache[
      //   require.resolve("../../src/middleware/route-ratelimit")
      // ]
      // rateLimitMiddleware = require("../../src/middleware/route-ratelimit")
      rateLimitMiddleware = new RateLimits()
      routeRateLimit = rateLimitMiddleware.routeRateLimit

      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.method = "GET"

      req.locals.proLimit = true
      req.locals.apiLevel = 0

      for (let i = 0; i < 5; i++) {
        next.reset() // reset the stubbed next() function.

        await routeRateLimit(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      //console.log(`req.locals after test: ${util.inspect(req.locals)}`)

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        true,
        `next should be called if rate limit was not triggered.`
      )
    })

    it("should trigger rate-limit for free tier 10 RPM", async () => {
      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.method = "GET"

      req.locals.proLimit = true
      req.locals.apiLevel = 0

      for (let i = 0; i < 12; i++) {
        next.reset() // reset the stubbed next() function.

        await routeRateLimit(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        false,
        `next should not be called if rate limit was triggered.`
      )
    })

    it("should NOT trigger rate-limit handler for pro-tier at 25 RPM", async () => {
      // Clear the require cache before running this test.
      // delete require.cache[
      //   require.resolve("../../src/middleware/route-ratelimit")
      // ]
      // rateLimitMiddleware = require("../../src/middleware/route-ratelimit")
      rateLimitMiddleware = new RateLimits()
      routeRateLimit = rateLimitMiddleware.routeRateLimit

      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.method = "GET"

      req.locals.proLimit = true
      req.locals.apiLevel = 10

      for (let i = 0; i < 25; i++) {
        next.reset() // reset the stubbed next() function.

        await routeRateLimit(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      //console.log(`req.locals after test: ${util.inspect(req.locals)}`)

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        true,
        `next should be called if rate limit was not triggered.`
      )
    })

    it("rate-limiting should still kick in at a higher RPM for pro-tier", async () => {
      // Clear the require cache before running this test.
      // delete require.cache[
      //   require.resolve("../../src/middleware/route-ratelimit")
      // ]
      // rateLimitMiddleware = require("../../src/middleware/route-ratelimit")
      rateLimitMiddleware = new RateLimits()
      routeRateLimit = rateLimitMiddleware.routeRateLimit

      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.method = "GET"

      req.locals.proLimit = true
      req.locals.apiLevel = 10

      for (let i = 0; i < 150; i++) {
        next.reset() // reset the stubbed next() function.

        await routeRateLimit(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      //console.log(`req.locals after test: ${util.inspect(req.locals)}`)

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        false,
        `next should NOT be called if rate limit was triggered.`
      )
    })
  })

  describe("#getResource", () => {
    it("should decode a blockchain request", () => {
      const url =
        "/blockchain/getTxOut/62a3ea958a463a372bc0caf2c374a7f60be9c624be63a0db8db78f05809df6d8/0?include_mempool=true"

      const result = rateLimits.getResource(url)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.equal(result, "blockchain")
    })
  })

  describe("#calcPoints", () => {
    it("should return 30 points for anonymous user", () => {
      const result = rateLimits.calcPoints()
      // console.log(`result: ${result}`)

      assert.equal(result, 30)
    })

    it("should return 10 points for free tier requesting full node access", () => {
      const jwtInfo = {
        apiLevel: 10,
        resource: "blockchain",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 10)
    })

    it("should return 10 points for free tier requesting indexer access", () => {
      const jwtInfo = {
        apiLevel: 10,
        resource: "blockbook",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 10)
    })

    it("should return 10 points for free tier requesting SLPDB access", () => {
      const jwtInfo = {
        apiLevel: 10,
        resource: "slp",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 10)
    })

    it("should return 1 point for full node tier requesting full node access", () => {
      const jwtInfo = {
        apiLevel: 20,
        resource: "blockchain",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 1)
    })

    it("should return 10 points for full-node tier requesting indexer access", () => {
      const jwtInfo = {
        apiLevel: 20,
        resource: "blockbook",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 10)
    })

    it("should return 10 points for full node tier requesting SLPDB access", () => {
      const jwtInfo = {
        apiLevel: 20,
        resource: "slp",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 10)
    })

    it("should return 1 point for indexer tier requesting full node access", () => {
      const jwtInfo = {
        apiLevel: 30,
        resource: "blockchain",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 1)
    })

    it("should return 1 points for indexer tier requesting indexer access", () => {
      const jwtInfo = {
        apiLevel: 30,
        resource: "blockbook",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 1)
    })

    it("should return 10 points for indexer tier requesting SLPDB access", () => {
      const jwtInfo = {
        apiLevel: 30,
        resource: "slp",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 10)
    })

    it("should return 1 point for SLP tier requesting full node access", () => {
      const jwtInfo = {
        apiLevel: 40,
        resource: "blockchain",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 1)
    })

    it("should return 1 points for SLP tier requesting indexer access", () => {
      const jwtInfo = {
        apiLevel: 40,
        resource: "blockbook",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 1)
    })

    it("should return 1 points for SLP tier requesting SLPDB access", () => {
      const jwtInfo = {
        apiLevel: 40,
        resource: "slp",
        id: "5e3a0415eb29a962da2708b4"
      }

      const result = rateLimits.calcPoints(jwtInfo)
      assert.equal(result, 1)
    })
  })

  describe("#rateLimitByResource", () => {
    it("should pass through rate-limit middleware", async () => {
      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.url = req.path
      req.method = "GET"

      // Call the route twice to trigger the rate handling.
      await rateLimits.rateLimitByResource(req, res, next)
      await rateLimits.rateLimitByResource(req, res, next)

      // next() will be called if rate-limit is not triggered
      assert.equal(next.called, true)
    })

    it("should trigger rate-limit handler if rate limits exceeds 5 request per minute", async () => {
      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.url = req.path
      req.method = "GET"

      for (let i = 0; i < 5; i++) {
        next.reset() // reset the stubbed next() function.

        await rateLimits.rateLimitByResource(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        false,
        `next should not be called if rate limit was triggered.`
      )
    })

    it("should NOT trigger rate-limit for free-tier at 5 RPM", async () => {
      // Create a new instance of the rate limit so we start with zeroed tracking.
      rateLimits = new RateLimits()

      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.url = req.path
      req.method = "GET"

      req.locals.jwtToken = "some-token"

      const jwtInfo = {
        apiLevel: 10,
        id: "5e3a0415eb29a962da2708b4"
      }

      // Mock the call to the jwt library.
      sandbox.stub(rateLimits.jwt, "verify").returns(jwtInfo)

      for (let i = 0; i < 5; i++) {
        next.reset() // reset the stubbed next() function.

        await rateLimits.rateLimitByResource(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      //console.log(`req.locals after test: ${util.inspect(req.locals)}`)

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        true,
        `next should be called if rate limit was not triggered.`
      )
    })

    it("should trigger rate-limit for free tier after 10 RPM", async () => {
      // Create a new instance of the rate limit so we start with zeroed tracking.
      rateLimits = new RateLimits()

      req.baseUrl = "/v3"
      req.path = "/control/getNetworkInfo"
      req.url = req.path
      req.method = "GET"

      req.locals.jwtToken = "some-token"

      const jwtInfo = {
        apiLevel: 10,
        id: "5e3a0415eb29a962da2708b4"
      }

      // Mock the call to the jwt library.
      sandbox.stub(rateLimits.jwt, "verify").returns(jwtInfo)

      for (let i = 0; i < 12; i++) {
        next.reset() // reset the stubbed next() function.

        await rateLimits.rateLimitByResource(req, res, next)
        //console.log(`next() called: ${next.called}`)
      }

      // Note: next() will be called unless the rate-limit kicks in.
      assert.equal(
        next.called,
        false,
        `next should not be called if rate limit was triggered.`
      )
    })
  })
})

// Generates a Basic authorization header.
function generateAuthHeader(pass) {
  // https://en.wikipedia.org/wiki/Basic_access_authentication
  const username = "BITBOX"
  const combined = `${username}:${pass}`

  var base64Credential = Buffer.from(combined).toString("base64")
  var readyCredential = `Basic ${base64Credential}`

  return readyCredential
}