import os
import uuid
import csv
import io

import pytest
from fastapi.testclient import TestClient

# Ensure required env vars for app import/config
os.environ.setdefault("SECRET_KEY", "x" * 32)
os.environ.setdefault("DATABASE_URL", "sqlite:////tmp/delphi_test.sqlite")

from app.main import app  # noqa: E402
from app.auth.security import get_current_user  # noqa: E402


@pytest.fixture(scope="module")
def client():
    # Override auth to bypass JWT for these tests
    class _User:
        def __init__(self):
            self.id = "test"
            self.username = "tester"
            self.is_admin = True
            self.is_active = True

    app.dependency_overrides[get_current_user] = lambda: _User()

    try:
        yield TestClient(app)
    finally:
        app.dependency_overrides.pop(get_current_user, None)


@pytest.fixture(scope="module")
def phone_book_data(client: TestClient):
    gid1 = f"PBGRP1-{uuid.uuid4().hex[:6]}"
    gid2 = f"PBGRP2-{uuid.uuid4().hex[:6]}"

    def _create_customer(cid: str, last: str, first: str, group: str):
        payload = {
            "id": cid,
            "last": last,
            "first": first,
            "group": group,
            "email": f"{cid.lower()}@example.com",
        }
        resp = client.post("/api/customers/", json=payload)
        assert resp.status_code == 200, resp.text

    def _add_phone(cid: str, location: str, number: str):
        resp = client.post(f"/api/customers/{cid}/phones", json={"location": location, "phone": number})
        assert resp.status_code == 200, resp.text

    # Create entries for letters A, B and non-alpha '#'
    cid_a1 = f"PB-{uuid.uuid4().hex[:6]}-A1"
    cid_a2 = f"PB-{uuid.uuid4().hex[:6]}-A2"
    cid_b1 = f"PB-{uuid.uuid4().hex[:6]}-B1"
    cid_hash = f"PB-{uuid.uuid4().hex[:6]}-H"

    _create_customer(cid_a1, last="Alpha", first="Alice", group=gid1)
    _add_phone(cid_a1, "Office", "111-111-1111")
    _add_phone(cid_a1, "Mobile", "111-111-2222")

    _create_customer(cid_a2, last="Able", first="Andy", group=gid1)
    _add_phone(cid_a2, "Office", "222-222-2222")

    _create_customer(cid_b1, last="Beta", first="Bob", group=gid2)
    _add_phone(cid_b1, "Home", "333-333-3333")

    _create_customer(cid_hash, last="123Company", first="NA", group=gid1)
    _add_phone(cid_hash, "Main", "444-444-4444")

    try:
        yield {
            "gid1": gid1,
            "gid2": gid2,
            "ids": [cid_a1, cid_a2, cid_b1, cid_hash],
        }
    finally:
        # Cleanup
        for cid in [cid_a1, cid_a2, cid_b1, cid_hash]:
            client.delete(f"/api/customers/{cid}")


def _parse_csv(text: str):
    reader = csv.reader(io.StringIO(text))
    rows = list(reader)
    return rows[0], rows[1:]


def test_phone_book_csv_letter_column_when_grouped_by_letter(client: TestClient, phone_book_data):
    # Only include our test group gid1 to avoid interference
    gid = phone_book_data["gid1"]
    resp = client.get(
        "/api/customers/phone-book",
        params={
            "format": "csv",
            "mode": "numbers",
            "grouping": "letter",
            "groups": gid,
        },
    )
    assert resp.status_code == 200
    assert "text/csv" in resp.headers.get("content-type", "")
    header, rows = _parse_csv(resp.text)
    assert "Letter" in header
    # Ensure letters include 'A' and '#'
    letters = {r[header.index("Letter")] for r in rows}
    assert "A" in letters and "#" in letters


def test_phone_book_html_sections_by_letter_with_page_break(client: TestClient, phone_book_data):
    gid = phone_book_data["gid1"]
    resp = client.get(
        "/api/customers/phone-book",
        params={
            "format": "html",
            "mode": "numbers",
            "grouping": "letter",
            "page_break": "1",
            "groups": gid,
        },
    )
    assert resp.status_code == 200
    html = resp.text
    # Snapshot-style checks: section headers and page-break class
    assert "Letter: A" in html
    assert "Letter: #" in html
    assert "class=\"section-title\"" in html
    assert "page-break" in html  # later sections should have page-break class


def test_phone_book_html_group_then_letter_sections(client: TestClient, phone_book_data):
    gid1 = phone_book_data["gid1"]
    gid2 = phone_book_data["gid2"]
    # Include both groups to verify group and nested letter sections
    resp = client.get(
        "/api/customers/phone-book",
        params=[
            ("format", "html"),
            ("mode", "addresses"),
            ("grouping", "group_letter"),
            ("groups", gid1),
            ("groups", gid2),
        ],
    )
    assert resp.status_code == 200
    html = resp.text
    assert f"Group: {gid1}" in html
    assert f"Group: {gid2}" in html
    assert "Letter: A" in html or "Letter: #" in html


def test_phone_book_csv_no_letter_for_grouping_none(client: TestClient, phone_book_data):
    gid = phone_book_data["gid1"]
    resp = client.get(
        "/api/customers/phone-book",
        params={
            "format": "csv",
            "mode": "numbers",
            "grouping": "none",
            "groups": gid,
        },
    )
    assert resp.status_code == 200
    header, rows = _parse_csv(resp.text)
    assert "Letter" not in header
    # Basic sanity: names and phones are present
    assert any("Alpha" in ",".join(row) or "Able" in ",".join(row) for row in rows)


def test_phone_book_respects_group_filter(client: TestClient, phone_book_data):
    gid2 = phone_book_data["gid2"]
    resp = client.get(
        "/api/customers/phone-book",
        params={
            "format": "csv",
            "mode": "numbers",
            "grouping": "letter",
            "groups": gid2,
        },
    )
    assert resp.status_code == 200
    header, rows = _parse_csv(resp.text)
    # Only Beta/Bob (gid2) should be present
    all_text = "\n".join([",".join(r) for r in rows])
    assert "Beta" in all_text or "Bob" in all_text
    # Ensure gid1 names are not present
    assert "Alpha" not in all_text and "Able" not in all_text