// SPDX-License-Identifier: LicenseRef-ConusAI-Template-1.0
// Observability of the server processes (spec §9.5, plan item AT4.2): errors, traces and logs
// configured from the deployment contract, carrying the request's trace id, with secrets and tokens
// taken out before anything leaves the process, and a plain no-op with a clear log line when the
// deployment has no DSN. The SDK is the real @conusai-sdk/observe-node; only the network is a
// recording `fetch`.

import {
  createRedactor,
  FILTERED,
  loadAppEnv,
  observabilityConfig,
  observabilityLine,
  secretsOf,
  startObservability,
} from "@app/config"
import { ids, withRequest } from "@conusai-sdk/observe-node"
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest"

const TRACE_ID = "4bf92f3577b34da6a3ce929d0e0e4736"
const TRACEPARENT = `00-${TRACE_ID}-00f067aa0ba902b7-01`
const SECRET = "s3cr3t-session-key-0123456789abcdef"
const TOKEN = "dt_0123456789abcdef0123456789abcdef"

const base: Record<string, string> = {
  NODE_ENV: "test",
  CONUSAI_FAKE_PLATFORM: "1",
  CONUSAI_API_URL: "http://127.0.0.1:4010/api",
  CONUSAI_API_TOKEN: TOKEN,
  CONUSAI_PROJECT_ID: "42",
  CONUSAI_ORG_ID: "9",
  POSTGRES_URL: "postgresql://app_app:hunter2hunter2@db:5432/app",
  POSTGRES_READER_URL: "postgresql://app_reader:another-long-pass@db:5432/app",
  AUTH_SESSION_SECRET: SECRET,
}

const appEnv = (extra: Record<string, string> = {}, service: "web" | "worker" = "web") =>
  loadAppEnv(service, { ...base, ...extra })

describe("the observability settings", () => {
  it("reads release, environment and service name from the deployment contract", () => {
    const env = appEnv({
      CONUSAI_DSN: "https://pub@errors.example.test/42",
      CONUSAI_RELEASE: "2026.10.1",
      CONUSAI_ENVIRONMENT: "preview",
      OTEL_SERVICE_NAME: "acme-review",
      OTEL_EXPORTER_OTLP_ENDPOINT: "https://otel.example.test",
    })
    expect(observabilityConfig("web", env.deployment, env.production)).toMatchObject({
      errors: true,
      otlp: true,
      release: "2026.10.1",
      environment: "preview",
      serviceName: "acme-review",
    })
  })

  it("falls back to OTEL_SERVICE_VERSION, then to `dev`, and names the run mode when the platform names no environment", () => {
    const platformRelease = appEnv({ OTEL_SERVICE_VERSION: "abc1234" })
    expect(observabilityConfig("worker", platformRelease.deployment, false)).toMatchObject({
      release: "abc1234",
      environment: "development",
      serviceName: "app-worker",
    })
    expect(observabilityConfig("web", appEnv().deployment, true)).toMatchObject({
      release: "dev",
      environment: "production",
    })
  })

  it("says in one line what a process without a DSN will not send", () => {
    const env = appEnv()
    const line = observabilityLine(observabilityConfig("web", env.deployment, false))
    expect(line).toContain("errors off (CONUSAI_DSN is not set)")
    expect(line).toContain("logs and traces off (OTEL_EXPORTER_OTLP_ENDPOINT is not set)")
  })
})

describe("redaction", () => {
  const redact = createRedactor(secretsOf({ ...base }))

  it.each([
    ["MONGODB_URL", "mongodb://app:encoded%2Fpassword-long@db:27017/app", "encoded/password-long"],
    ["CONVEX_ADMIN_KEY", "opaque-convex-administrator-value", "opaque-convex-administrator-value"],
    ["CONVEX_SELF_HOSTED_ADMIN_KEY", "opaque-self-hosted-convex-admin-value", "opaque-self-hosted-convex-admin-value"],
  ])("removes %s credentials from profile driver errors", (name, value, credential) => {
    const profileRedactor = createRedactor(secretsOf({ [name]: value }))
    expect(profileRedactor.text(`driver rejected ${credential}`)).toBe(`driver rejected ${FILTERED}`)
    expect(profileRedactor.deep({ exception: { value: `driver rejected ${credential}` } })).toEqual({
      exception: { value: `driver rejected ${FILTERED}` },
    })
  })

  it("takes the process's own secret values out of any string, wherever they appear", () => {
    expect(redact.text(`session ${SECRET} and token ${TOKEN}`)).toBe(`session ${FILTERED} and token ${FILTERED}`)
    // A connection string's password goes on its own, too, as the driver quotes it in an error.
    expect(redact.text("password authentication failed: hunter2hunter2")).toBe(
      `password authentication failed: ${FILTERED}`,
    )
  })

  it.each([
    ["a bearer credential", "sent Authorization: Bearer abcdef0123456789xyz", "abcdef0123456789xyz"],
    ["a credential in a URL", "connect postgresql://user:p4ssw0rd-long@db:5432/app", "p4ssw0rd-long"],
    ["a JSON web token", "id eyJhbGciOiJSUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.c2lnbmF0dXJl", "eyJzdWIi"],
    ["an organization API key", "key cak_ab12cd34_0123456789abcdefghij", "0123456789abcdefghij"],
    ["an invitation link", "GET /invitations/acme/Zm9vYmFyYmF6cXV4MTIzNDU2Nzg5MA", "Zm9vYmFyYmF6cXV4MTIzNDU2Nzg5MA"],
    [
      "an invitation link inside a return_to query",
      "GET /auth/sign-in?return_to=%2Finvitations%2Facme%2FZm9vYmFyYmF6cXV4MTIzNDU2Nzg5MA",
      "Zm9vYmFyYmF6cXV4MTIzNDU2Nzg5MA",
    ],
    ["an authorization code in a query", "GET /auth/callback?code=abc123&state=xyz789", "abc123"],
    ["an e-mail address", "invited ada@example.test", "ada@example.test"],
  ])("removes %s", (_name, text, secret) => {
    const cleaned = redact.text(text)
    expect(cleaned).not.toContain(secret)
    expect(cleaned.length).toBeGreaterThan(0)
  })

  it("keeps what is not a secret: the organization in an invitation link, the path, the words", () => {
    expect(redact.text("GET /invitations/acme/Zm9vYmFyYmF6cXV4MTIzNDU2Nzg5MA failed")).toContain("/invitations/acme/")
    expect(redact.text("procedure notes.note.create failed")).toBe("procedure notes.note.create failed")
  })

  it("filters a value under a key that names a secret, at any depth, and strings inside arrays", () => {
    const cleaned = redact.deep({
      headers: { authorization: "Bearer x", "x-csrf-token": "t", accept: "text/html" },
      nested: { api_key: "k", session: { id: "s" }, list: [{ password: "p" }, "mail bob@example.test"] },
      count: 3,
    })
    expect(cleaned).toEqual({
      headers: { authorization: FILTERED, "x-csrf-token": FILTERED, accept: "text/html" },
      nested: { api_key: FILTERED, session: FILTERED, list: [{ password: FILTERED }, "mail [email]"] },
      count: 3,
    })
  })

  it("survives a value that points at itself", () => {
    const loop: Record<string, unknown> = { name: "loop" }
    loop.self = loop
    expect(redact.deep(loop)).toEqual({ name: "loop", self: FILTERED })
  })

  it("scrubs an error event but leaves the ids that join it to its request", () => {
    const event = redact.event({
      message: `failed for ${SECRET}`,
      request: { url: "https://app.example.test/auth/callback?code=abc&state=def", headers: { cookie: "s=1" } },
      contexts: {
        trace: { trace_id: TRACE_ID, span_id: "00f067aa0ba902b7" },
        conusai: { session_id: "8f6a1c0e-2b8d-4a43-9d6e-5d1f6c2b7a90", request_id: "req-1" },
        runtime: { token: "x" },
      },
      exception: { values: [{ type: "Error", value: "bad Bearer abcdef0123456789xyz" }] },
    })
    expect(JSON.stringify(event)).not.toContain(SECRET)
    expect(event.request?.url).toBe(`https://app.example.test/auth/callback?code=${FILTERED}&state=${FILTERED}`)
    expect(event.request?.headers?.cookie).toBe(FILTERED)
    expect(event.exception?.values?.[0]?.value).toBe(`bad Bearer ${FILTERED}`)
    expect(event.contexts?.trace).toEqual({ trace_id: TRACE_ID, span_id: "00f067aa0ba902b7" })
    expect(event.contexts?.conusai).toMatchObject({ request_id: "req-1" })
    expect(event.contexts?.runtime).toEqual({ token: FILTERED })
  })
})

describe("startObservability", () => {
  const handlers = new Map<string, unknown[]>()
  beforeEach(() => {
    // Record the process handlers the SDK installs instead of installing them in the test worker.
    vi.spyOn(process, "on").mockImplementation(((event: string, fn: unknown) => {
      handlers.set(event, [...(handlers.get(event) ?? []), fn])
      return process
    }) as never)
    vi.spyOn(process, "off").mockImplementation((() => process) as never)
  })
  afterEach(() => {
    handlers.clear()
    vi.restoreAllMocks()
  })

  it("is a no-op with one clear log line when the deployment has no DSN", async () => {
    const lines: string[] = []
    const observe = startObservability(appEnv(), { env: base, out: (line) => lines.push(line) })
    expect(observe.errors).toBeUndefined()
    expect(observe.otlp).toBeUndefined()
    observe.captureException(new Error("nobody listens"))
    await observe.shutdown()
    expect(lines).toHaveLength(1)
    expect(JSON.parse(lines[0] as string)).toMatchObject({
      level: "info",
      service: "app-web",
      message: expect.stringContaining("errors off (CONUSAI_DSN is not set)"),
    })
    expect(handlers.size).toBe(0)
  })

  it("sends an error with the request's trace and request ids, and no secret", async () => {
    const sent: Array<{ url: string; body: string }> = []
    const recording = (async (url: string | URL | Request, init?: RequestInit) => {
      const body = init?.body
      const text = typeof body === "string" ? body : Buffer.from(body as Uint8Array).toString("utf8")
      sent.push({ url: String(url), body: text })
      return new Response("{}", { status: 200 })
    }) as typeof fetch
    const observe = startObservability(
      appEnv({ CONUSAI_DSN: "https://pub123@errors.example.test/42", CONUSAI_RELEASE: "r-1" }),
      { env: base, out: () => undefined, fetch: recording },
    )
    expect(observe.errors).toBeDefined()

    withRequest(new Headers({ traceparent: TRACEPARENT, "x-request-id": "req-77" }), () => {
      observe.captureException(new Error(`db down at postgresql://app_app:hunter2hunter2@db:5432/app with ${TOKEN}`), {
        procedure: "notes.note.create",
      })
    })
    await observe.errors?.flush(2_000)

    const [request] = sent
    expect(request?.url).toContain("https://errors.example.test/api/42/envelope/")
    expect(request?.body).toContain(TRACE_ID)
    expect(request?.body).toContain("req-77")
    expect(request?.body).toContain('"release":"r-1"')
    expect(request?.body).not.toContain("hunter2hunter2")
    expect(request?.body).not.toContain(TOKEN)
    expect(request?.body).toContain(FILTERED)
    await observe.errors?.close()
  })

  it("sends a log line over OTLP with the request's trace id, redacted, and prints it as a JSON line", async () => {
    const posts: Array<{ url: string; body: string }> = []
    const lines: string[] = []
    const recording = (async (url: string | URL | Request, init?: RequestInit) => {
      posts.push({ url: String(url), body: String(init?.body) })
      return new Response("{}", { status: 200 })
    }) as typeof fetch
    const observe = startObservability(
      appEnv({ OTEL_EXPORTER_OTLP_ENDPOINT: "http://127.0.0.1:4010/otel", OTEL_SERVICE_NAME: "acme-review" }),
      { env: base, out: (line) => lines.push(line), fetch: recording },
    )
    expect(observe.otlp?.enabled).toBe(true)

    withRequest(new Headers({ traceparent: TRACEPARENT, "x-request-id": "req-78" }), () => {
      expect(ids().trace_id).toBe(TRACE_ID)
      observe.log.warn(`token ${TOKEN} refused`, { "conusai.org_slug": "acme", password: "p" })
    })
    await observe.otlp?.flush(2_000)

    const logs = posts.filter((post) => post.url.endsWith("/otel/v1/logs"))
    expect(logs.length).toBeGreaterThan(0)
    const body = logs.map((post) => post.body).join("\n")
    expect(body).toContain(TRACE_ID)
    expect(body).toContain("acme-review")
    expect(body).not.toContain(TOKEN)
    expect(body).not.toContain('"p"')

    const printed = lines
      .map((line) => JSON.parse(line) as Record<string, string>)
      .find((line) => line.level === "warn")
    expect(printed).toMatchObject({ trace_id: TRACE_ID, request_id: "req-78", "conusai.org_slug": "acme" })
    expect(JSON.stringify(printed)).not.toContain(TOKEN)
    expect(printed?.password).toBe(FILTERED)
    await observe.shutdown()
  })

  it("runs a function as a span under the request's trace and returns what it returns", async () => {
    const posts: string[] = []
    const recording = (async (url: string | URL | Request, init?: RequestInit) => {
      if (String(url).endsWith("/otel/v1/traces")) posts.push(String(init?.body))
      return new Response("{}", { status: 200 })
    }) as typeof fetch
    const observe = startObservability(appEnv({ OTEL_EXPORTER_OTLP_ENDPOINT: "http://127.0.0.1:4010/otel" }), {
      env: base,
      out: () => undefined,
      fetch: recording,
    })
    const answer = withRequest(new Headers({ traceparent: TRACEPARENT }), () =>
      observe.span("procedure notes.note.create", { "conusai.org_slug": "acme" }, () => 42),
    )
    expect(answer).toBe(42)
    await observe.otlp?.flush(2_000)
    const body = posts.join("\n")
    expect(body).toContain("procedure notes.note.create")
    expect(body).toContain(TRACE_ID)
    expect(body).toContain("conusai.org_slug")
    await observe.shutdown()
  })

  it("runs a function as itself when traces are off", () => {
    const observe = startObservability(appEnv(), { env: base, out: () => undefined })
    expect(observe.span("anything", {}, () => "plain")).toBe("plain")
  })
})