import assert from "node:assert/strict"
import { readFile } from "node:fs/promises"
import test from "node:test"
import ts from "typescript"
import vm from "node:vm"

function createElement(tagName) {
  return {
    tagName,
    children: [],
    dataset: {},
    style: {},
    attributes: {},
    listeners: {},
    parentNode: null,
    contentWindow: {},
    setAttribute(name, value) {
      this.attributes[name] = String(value)
    },
    appendChild(child) {
      child.parentNode = this
      this.children.push(child)
      return child
    },
    removeChild(child) {
      this.children = this.children.filter((item) => item !== child)
      child.parentNode = null
      return child
    },
    addEventListener(type, handler) {
      this.listeners[type] = handler
    },
    click() {
      this.listeners.click?.()
    },
  }
}

async function loadSdk(config) {
  const source = await readFile(new URL("./agent-desk-sdk.ts", import.meta.url), "utf8")
  const compiled = ts.transpileModule(source, {
    compilerOptions: {
      target: ts.ScriptTarget.ES2017,
      module: ts.ModuleKind.ESNext,
      importsNotUsedAsValues: ts.ImportsNotUsedAsValues.Remove,
    },
    fileName: "agent-desk-sdk.ts",
  })
  const body = createElement("body")
  const sandbox = {
    URL,
    console,
    fetch: async (url) => ({
      json: async () =>
        String(url).endsWith("/api/config")
          ? {
              success: true,
              data: {
                language: "en-US",
              },
            }
          : {
              success: true,
              data: {
                themeColor: "#2563eb",
              },
            },
    }),
    document: {
      body,
      currentScript: {
        src: "https://chat.example/sdk/agent-desk-sdk.min.js",
      },
      createElement,
      createElementNS: (_namespace, tagName) => createElement(tagName),
    },
    window: {
      AgentDeskConfig: config,
      location: {
        origin: "https://host.example",
      },
      addEventListener() {},
      removeEventListener() {},
      clearTimeout() {},
      setTimeout(handler, delay) {
        if (!delay || delay < 1000) {
          handler()
        }
        return 1
      },
    },
  }
  sandbox.window.window = sandbox.window
  sandbox.window.document = sandbox.document
  sandbox.window.fetch = sandbox.fetch
  sandbox.window.console = console
  sandbox.window.URL = URL
  sandbox.window.setTimeout = sandbox.window.setTimeout
  sandbox.window.clearTimeout = sandbox.window.clearTimeout

  const compiledCode = compiled.outputText.replace(/\nexport\s*\{\};?\s*$/, "")
  vm.runInNewContext(compiledCode, sandbox)
  await Promise.resolve()
  await Promise.resolve()
  return sandbox
}

async function flushPromises(count = 30) {
  for (let i = 0; i < count; i += 1) {
    await Promise.resolve()
  }
}

test("getChatUrl resolves a fresh userToken for each call", async () => {
  let calls = 0
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    getUserToken: async () => `token_${++calls}`,
  })

  assert.equal(typeof sandbox.window.AgentDeskWidget.getChatUrl, "function")

  const first = await sandbox.window.AgentDeskWidget.getChatUrl()
  const second = await sandbox.window.AgentDeskWidget.getChatUrl()

  assert.equal(new URL(first).pathname, "/support/chat/")
  assert.equal(new URL(second).pathname, "/support/chat/")
  assert.equal(new URL(first).searchParams.get("userToken"), "token_1")
  assert.equal(new URL(second).searchParams.get("userToken"), "token_2")
  assert.equal(new URL(first).searchParams.get("parentOrigin"), "https://host.example")
  assert.equal(calls, 2)
})

test("getChatUrl forwards a signed externalId with its timestamp", async () => {
  const seen = []
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    externalId: "u_10001",
    externalName: "Ivan",
    signExternalId: async (externalId) => {
      seen.push(externalId)
      return { signature: `sig_${seen.length}`, issuedAt: 1700000000 + seen.length }
    },
  })

  const first = await sandbox.window.AgentDeskWidget.getChatUrl()
  const second = await sandbox.window.AgentDeskWidget.getChatUrl()

  assert.equal(new URL(first).searchParams.get("externalId"), "u_10001")
  assert.equal(new URL(first).searchParams.get("externalIdSignature"), "sig_1")
  assert.equal(new URL(first).searchParams.get("externalIdSignedAt"), "1700000001")
  assert.equal(new URL(second).searchParams.get("externalIdSignature"), "sig_2")
  assert.equal(new URL(second).searchParams.get("externalIdSignedAt"), "1700000002")
  assert.deepEqual(seen, ["u_10001", "u_10001"])
})

test("no signer means no identity parameters", async () => {
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    externalId: "u_10001",
  })

  const url = await sandbox.window.AgentDeskWidget.getChatUrl()

  assert.equal(new URL(url).searchParams.get("externalId"), "u_10001")
  assert.equal(new URL(url).searchParams.has("externalIdSignature"), false)
  assert.equal(new URL(url).searchParams.has("externalIdSignedAt"), false)
})

test("signer without an externalId is not called", async () => {
  let calls = 0
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    signExternalId: async () => {
      calls += 1
      return { signature: "sig", issuedAt: 1700000000 }
    },
  })

  const url = await sandbox.window.AgentDeskWidget.getChatUrl()

  assert.equal(calls, 0)
  assert.equal(new URL(url).searchParams.has("externalIdSignature"), false)
})

// A signature expires, so reopening on a long-lived host page must hand the frame
// a fresh one instead of leaving the stale pair in its URL.
test("reopening reloads the frame when a fresh signature was issued", async () => {
  let issued = 0
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    externalId: "u_10001",
    signExternalId: async () => {
      issued += 1
      return { signature: `sig_${issued}`, issuedAt: 1700000000 + issued }
    },
  })
  await flushPromises()

  const widget = sandbox.window.AgentDeskWidget
  await widget.open()
  const frame = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "frame"
  )
  assert.ok(frame, "expected the launcher click to create the frame")
  const firstSrc = frame.src
  assert.ok(firstSrc.includes("externalIdSignature=sig_1"), `frame src = ${firstSrc}`)

  widget.close()
  await widget.open()

  const reloaded = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "frame"
  )
  assert.ok(reloaded.src.includes("externalIdSignature=sig_2"), `frame src after reopen = ${reloaded.src}`)
  assert.notEqual(reloaded.src, firstSrc)
})

test("launcher click creates chat iframe with a freshly resolved userToken", async () => {
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    getUserToken: async () => "click_token",
  })
  await flushPromises()
  const launcher = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "launcher"
  )

  assert.ok(launcher)
  assert.equal(launcher.children.at(-1)?.textContent, "Support")

  launcher.click()
  await flushPromises()

  const frame = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "frame"
  )

  assert.ok(frame)
  assert.equal(new URL(frame.src).pathname, "/support/chat/")
  assert.equal(new URL(frame.src).searchParams.get("userToken"), "click_token")
})

test("requireUserToken rejects opening when getUserToken is missing or empty", async () => {
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    requireUserToken: true,
    getUserToken: async () => "   ",
  })
  await flushPromises()

  await assert.rejects(
    () => sandbox.window.AgentDeskWidget.open(),
    /Support user token is required/
  )
  const frame = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "frame"
  )
  assert.equal(frame, undefined)
})

test("ru-RU language configures Russian launcher and default title", async () => {
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
    language: "ru-RU",
  })
  await flushPromises()
  const launcher = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "launcher"
  )
  assert.ok(launcher)
  assert.equal(launcher.attributes["aria-label"], "Поддержка")
  assert.equal(launcher.children.at(-1)?.textContent, "Чат")
})

test("chat iframe layout uses dynamic viewport height for iOS browser chrome", async () => {
  const sandbox = await loadSdk({
    channelId: "ch_1",
    baseUrl: "https://api.example",
  })
  await flushPromises()
  const launcher = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "launcher"
  )

  launcher.click()
  await flushPromises()

  const frame = sandbox.document.body.children.find(
    (child) => child.dataset.agentDeskWidget === "frame"
  )

  assert.ok(frame)
  assert.match(frame.style.height, /100dvh/)
  assert.match(frame.style.maxWidth, /100vw/)
  assert.equal(frame.style.borderRadius, "16px")
})