// SPDX-License-Identifier: LicenseRef-ConusAI-Template-1.0
// What a route loader reads (F10). `pageContext` and `permissionsIn` are kept per request, because React's
// `cache` memoizes nothing outside server components, and `modulePageData` is the one module route's
// loader: signed out is a redirect, every refusal is a real status, and a module's data passes through.

import { AppError } from "@conusai-kit/core"
import { isNotFound, isRedirect } from "@tanstack/react-router"
import { beforeEach, describe, expect, it, vi } from "vitest"

const mocks = vi.hoisted(() => ({
  requestContext: vi.fn(),
  callByName: vi.fn(),
  setResponseHeader: vi.fn<(name: string, value: string) => void>(),
  load: vi.fn(),
  call: vi.fn(),
}))

vi.mock("@tanstack/react-start/server", () => ({
  getRequest: () => {
    throw new Error("the tests pass their request")
  },
  setResponseStatus: vi.fn(),
  setResponseHeader: mocks.setResponseHeader,
}))
vi.mock("../apps/web/src/server/request", () => ({ requestContext: mocks.requestContext }))
vi.mock("../apps/web/src/server/app", () => ({
  webRuntime: () => ({
    observe: { config: { errors: false } },
    selfServiceOrganizations: "members",
    registry: {
      modules: [{ id: "notes" }, { id: "unpaged" }],
      nav: [{ module: "notes", scope: "project", href: "notes", label: "workspace.projects" }],
    },
    env: { deployment: {} },
  }),
}))
vi.mock("../apps/web/src/server/tenancy-calls", () => ({ mayCreateOrganization: () => false }))
vi.mock("../apps/web/src/server/platform-theme", () => ({
  organizationThemeStyle: async () => undefined,
  organizationIdentity: async () => ({}),
}))
vi.mock("@conusai-kit/host/http", () => ({ csrfSessionId: () => "session", csrfToken: () => "token" }))
vi.mock("@app/modules/pages", () => ({ modulePages: { notes: async () => ({ load: mocks.load }) } }))

const { modulePageData, pageContext, permissionsIn, projectLayoutData, shellData } = await import(
  "../apps/web/src/server/page"
)

const person = { actor: { kind: "user" } }
const signedIn = () =>
  mocks.requestContext.mockResolvedValue({
    caller: { call: mocks.call, callByName: mocks.callByName },
    container: {},
    principal: person,
    user: { email: "ada@example.test", displayName: "Ada", locale: "en" },
  })
const signedOut = () =>
  mocks.requestContext.mockResolvedValue({
    caller: { call: mocks.call, callByName: mocks.callByName },
    container: {},
    principal: null,
  })
const request = (): Request => new Request("http://app.test/a/b/c/notes", { headers: { "x-path": "/a/b/c/notes" } })
const params = { org: "a", workspace: "b", project: "c", module: "notes" }
const refusal = (status: number): AppError =>
  new AppError({ type: "/problems/refused", code: "refused", title: "Refused", status })

beforeEach(() => {
  vi.clearAllMocks()
  mocks.callByName.mockResolvedValue({ permissions: ["notes.note.read"], revision: "r1" })
  mocks.call.mockResolvedValue({})
  mocks.load.mockResolvedValue({ kind: "list", title: "Notes" })
})

describe("the page context", () => {
  it("is built once per request, and again for the next one", async () => {
    signedIn()
    const first = request()
    await Promise.all([pageContext(first), pageContext(first)])
    expect(mocks.requestContext).toHaveBeenCalledOnce()
    await pageContext(request())
    expect(mocks.requestContext).toHaveBeenCalledTimes(2)
  })

  it("reads the permissions of a scope once per request", async () => {
    signedIn()
    const current = request()
    await Promise.all([permissionsIn({ org: "a" }, current), permissionsIn({ org: "a" }, current)])
    expect(mocks.callByName).toHaveBeenCalledOnce()
    await permissionsIn({ org: "a", workspace: "b" }, current)
    expect(mocks.callByName).toHaveBeenCalledTimes(2)
  })
})

describe("the shell's loader data", () => {
  it("is plain values with its labels translated, and nothing a browser must not hold", async () => {
    vi.stubEnv("CONUSAI_PUBLIC_URL", "https://app.example.test")
    signedIn()
    const shell = await shellData(request())
    expect(JSON.parse(JSON.stringify(shell))).toEqual(shell)
    expect(shell.signedIn).toBe(true)
    expect(shell.labels.signIn.length).toBeGreaterThan(0)
    expect(shell.brand.style).toBeTypeOf("object")
    expect(shell.publicUrl).toBe("https://app.example.test")
    expect(JSON.stringify(shell)).not.toContain("ada@example.test")
  })
})

describe("the module route's loader", () => {
  const thrown = (run: Promise<unknown>): Promise<unknown> =>
    run.then(
      () => "resolved",
      (error: unknown) => error,
    )

  it("sends a signed-out visitor to sign in, before reading anything", async () => {
    signedOut()
    expect(isRedirect(await thrown(modulePageData(params, request())))).toBe(true)
    expect(mocks.call).not.toHaveBeenCalled()
    expect(mocks.load).not.toHaveBeenCalled()
  })

  it.each([
    ["no registered module", { ...params, module: "nothing" }],
    ["a registered module with no page", { ...params, module: "unpaged" }],
    ["a name every object has", { ...params, module: "constructor" }],
  ])("answers 404 for %s", async (_name, wanted) => {
    signedIn()
    expect(isNotFound(await thrown(modulePageData(wanted, request())))).toBe(true)
    expect(mocks.load).not.toHaveBeenCalled()
  })

  it.each([
    [404, undefined],
    [403, { forbidden: true }],
  ])("turns the module's own %i into that page", async (status, data) => {
    signedIn()
    mocks.load.mockRejectedValue(refusal(status))
    const error = (await thrown(modulePageData(params, request()))) as { data?: unknown }
    expect(isNotFound(error)).toBe(true)
    expect(error.data).toEqual(data)
    expect(mocks.setResponseHeader).toHaveBeenCalledWith("x-conusai-page-status", String(status))
  })

  it("leaves a fault to the error boundary", async () => {
    signedIn()
    const fault = new Error("database down")
    mocks.load.mockRejectedValue(fault)
    expect(await thrown(modulePageData(params, request()))).toBe(fault)
  })

  it("runs the module's loader with the slugs and the rest of the path", async () => {
    signedIn()
    const page = await modulePageData({ ...params, _splat: "note-1/" }, request())
    expect(mocks.load.mock.calls[0]?.[0]).toMatchObject({
      slugs: { org: "a", workspace: "b", project: "c" },
      segments: ["note-1"],
    })
    expect(page).toMatchObject({
      module: "notes",
      title: "Projects · Example App",
      segments: ["note-1"],
      data: { kind: "list", title: "Notes" },
    })
  })
})

describe("the project route's loader", () => {
  const slugs = { org: "a", workspace: "b", project: "c" }
  const refused = (run: Promise<unknown>): Promise<unknown> => run.catch((error: unknown) => error)

  it("sends a signed-out visitor to sign in, before it reads anything", async () => {
    signedOut()
    expect(isRedirect(await refused(projectLayoutData(slugs, request())))).toBe(true)
    expect(mocks.call).not.toHaveBeenCalled()
  })

  it("answers 404 for a project of another tenant", async () => {
    signedIn()
    mocks.call.mockRejectedValue(refusal(404))
    expect(isNotFound(await refused(projectLayoutData(slugs, request())))).toBe(true)
    expect(mocks.setResponseHeader).toHaveBeenCalledWith("x-conusai-page-status", "404")
  })

  it("returns the project's scope and the person's permissions there, the seed of useCan", async () => {
    signedIn()
    expect(await projectLayoutData(slugs, request())).toMatchObject({
      scope: slugs,
      seed: expect.objectContaining({ permissions: ["notes.note.read"] }),
      project: { id: slugs.project },
    })
  })
})