"""WhatsApp demo-number wiring (WHATSAPP_DEMO_TO).

The demo round trip (webhook POST -> ticket -> auto-reply -> mock-log) surfaces
the expected sender/recipient number. That number is **never committed**: it
lives only in the deploy host's .env and reaches the app through the
``WHATSAPP_DEMO_TO`` setting (same fail-closed env pattern as the webhook
secret). ``build_demo_webhook_payload()`` builds the demo payload from the
setting so mock-log and the auto-reply show the configured number; with the
setting unset it raises instead of fabricating a sender.

Anchors:
* ``settings.WHATSAPP_DEMO_TO`` defaults to ``""`` and no tracked file assigns
  it a value (real numbers stay out of git history).
* ``build_demo_webhook_payload`` uses the configured number as the message
  ``from`` and fails closed when unset.
* A full round trip with the secret + demo number logs the number and surfaces
  it in ``/api/whatsapp/mock-log``; the auto-reply targets the same number.
* Webhook stays 403 without the secret and mock-log stays 401 without auth.
"""

from __future__ import annotations

import re
import subprocess
from pathlib import Path

import pytest

pytestmark = pytest.mark.asyncio

from app.core.config import settings  # noqa: E402

# Clearly-fake test number — never use a real contact number in source.
_FAKE_DEMO_TO = "+233559999999"


async def _login(client, email="wahab@denya.com", password="denya123") -> str:
    resp = await client.post(
        "/api/auth/login",
        json={"email": email, "password": password},
    )
    assert resp.status_code == 200, resp.text
    return resp.json()["access_token"]


def _auth(token: str) -> dict:
    return {"Authorization": f"Bearer {token}"}


async def _capture_reply(monkeypatch, calls: list):
    """Swap the Meta client for a recorder; returns the fake."""
    from app.routers import whatsapp as whatsapp_router
    from app.schemas.whatsapp import WhatsAppReplyResponse

    async def _fake_reply(to_phone: str, text: str):
        calls.append((to_phone, text))
        return WhatsAppReplyResponse(success=True, message="sent")

    monkeypatch.setattr(whatsapp_router, "send_whatsapp_reply", _fake_reply)
    return whatsapp_router


# ── Config plumbing ───────────────────────────────────────────────────
def test_demo_number_defaults_empty_and_never_committed():
    """WHATSAPP_DEMO_TO must default empty; no tracked file may set a value.

    Real WhatsApp numbers are deploy-host .env secrets — a committed value
    (even in tests or .env.example) would leak into git history.
    """
    assert settings.WHATSAPP_DEMO_TO == ""

    root = Path.cwd()
    listed = subprocess.run(
        ["git", "ls-files", "-z"], cwd=root, capture_output=True, text=True
    )
    assert listed.returncode == 0, "git ls-files failed inside the test repo"
    tracked = [p for p in listed.stdout.split("\0") if p]

    assignment = re.compile(r"^WHATSAPP_DEMO_TO[ \t]*=[ \t]*(\S*)$")
    offenders = []
    for rel in tracked:
        path = root / rel
        if path.suffix.lower() in {".png", ".jpg", ".jpeg", ".db", ".pyc", ".ico", ".woff", ".woff2", ".gz"}:
            continue  # binaries cannot carry a text assignment
        try:
            text = path.read_text(encoding="utf-8", errors="ignore")
        except OSError:
            continue
        for lineno, line in enumerate(text.splitlines(), start=1):
            match = assignment.match(line)
            if match and match.group(1):
                offenders.append(f"{rel}:{lineno}: WHATSAPP_DEMO_TO={match.group(1)!r}")
    assert not offenders, (
        "WHATSAPP_DEMO_TO must stay unset in tracked files (set it in the "
        f"deploy host .env only); found: {offenders}"
    )


# ── Demo payload builder ─────────────────────────────────────────────
def test_demo_payload_builder_fails_closed_when_unset(monkeypatch):
    """Without WHATSAPP_DEMO_TO the builder raises rather than fabricating."""
    from app.routers.whatsapp import build_demo_webhook_payload

    monkeypatch.setattr(settings, "WHATSAPP_DEMO_TO", "")
    with pytest.raises(RuntimeError, match="WHATSAPP_DEMO_TO"):
        build_demo_webhook_payload()


def test_demo_payload_builder_uses_configured_number(monkeypatch):
    """The demo payload's message ``from`` is the configured demo number."""
    from app.routers.whatsapp import build_demo_webhook_payload

    monkeypatch.setattr(settings, "WHATSAPP_DEMO_TO", _FAKE_DEMO_TO)
    payload = build_demo_webhook_payload(text="Leaking tap", wa_message_id="wamid.demo.42")
    entry = payload["entry"][0]["changes"][0]
    assert entry["message"]["from"] == _FAKE_DEMO_TO
    assert entry["message"]["id"] == "wamid.demo.42"
    assert entry["message"]["text"]["text"] == "Leaking tap"


# ── Demo round trip ──────────────────────────────────────────────────
async def test_demo_round_trip_surfaces_number_in_mock_log(client, monkeypatch):
    """Webhook demo payload -> ticket + log; mock-log shows the demo number."""
    from app.routers.whatsapp import build_demo_webhook_payload

    replies: list[tuple[str, str]] = []
    await _capture_reply(monkeypatch, replies)

    monkeypatch.setattr(settings, "WHATSAPP_WEBHOOK_SECRET", "test-webhook-secret")
    monkeypatch.setattr(settings, "WHATSAPP_DEMO_TO", _FAKE_DEMO_TO)

    resp = await client.post(
        "/api/whatsapp/webhook",
        json=build_demo_webhook_payload(text="Demo leak"),
        headers={"X-Webhook-Secret": "test-webhook-secret"},
    )
    assert resp.status_code == 200, resp.text
    data = resp.json()
    assert data["status"] == "processed"
    assert data["ticket_number"].startswith("PAV-")

    # Auto-reply went back to the demo number.
    assert replies and replies[0][0] == _FAKE_DEMO_TO, replies

    token = await _login(client)
    log = await client.get("/api/whatsapp/mock-log", headers=_auth(token))
    assert log.status_code == 200, log.text
    entries = log.json()
    assert any(e["from_number"] == _FAKE_DEMO_TO for e in entries)
    assert any(e["ticket_number"] == data["ticket_number"] for e in entries)


async def test_webhook_still_403_without_secret_even_with_demo_number(client, monkeypatch):
    """The webhook secret gate is independent of the demo number."""
    monkeypatch.setattr(settings, "WHATSAPP_WEBHOOK_SECRET", "test-webhook-secret")
    monkeypatch.setattr(settings, "WHATSAPP_DEMO_TO", _FAKE_DEMO_TO)
    resp = await client.post("/api/whatsapp/webhook", json={"object": "whatsapp_business_account"})
    assert resp.status_code == 403


async def test_mock_log_still_401_gated(client):
    """mock-log stays authenticated-only (no token -> 401)."""
    resp = await client.get("/api/whatsapp/mock-log")
    assert resp.status_code == 401, resp.text