"""Tests for the digest scheduler and email HTML generation."""
import os
import pytest
from unittest.mock import patch, MagicMock
from flask import Flask
from werkzeug.security import generate_password_hash
from tinydb import Query

from utils.digest_scheduler import send_digests
from utils.email_sender import send_digest_email
from db.db import users_db, pending_confirmations_db, child_db, task_db, reward_db
from tests.conftest import TEST_SECRET_KEY

SCHED_USER_ID = "sched_test_user"
SCHED_EMAIL = "schedtest@example.com"
SCHED_CHILD_ID = "sched_child_id"
SCHED_TASK_ID = "sched_task_id"
SCHED_REWARD_ID = "sched_reward_id"


def seed_scheduler_data(
    verified=True,
    email_digest_enabled=True,
    timezone="UTC",
    has_pending=True,
):
    users_db.remove(Query().id == SCHED_USER_ID)
    child_db.remove(Query().id == SCHED_CHILD_ID)
    task_db.remove(Query().id == SCHED_TASK_ID)
    reward_db.remove(Query().id == SCHED_REWARD_ID)
    pending_confirmations_db.remove(Query().user_id == SCHED_USER_ID)

    users_db.insert({
        "id": SCHED_USER_ID,
        "first_name": "Sched",
        "last_name": "Tester",
        "email": SCHED_EMAIL,
        "password": generate_password_hash("schedpass"),
        "verified": verified,
        "role": "user",
        "image_id": None,
        "marked_for_deletion": False,
        "marked_for_deletion_at": None,
        "timezone": timezone,
        "email_digest_enabled": email_digest_enabled,
    })
    child_db.insert({
        "id": SCHED_CHILD_ID,
        "user_id": SCHED_USER_ID,
        "name": "Sched Child",
        "age": 8,
        "points": 50,
        "tasks": [SCHED_TASK_ID],
        "rewards": [SCHED_REWARD_ID],
        "image_id": None,
    })
    task_db.insert({
        "id": SCHED_TASK_ID,
        "user_id": SCHED_USER_ID,
        "name": "Clean Room",
        "points": 10,
        "type": "chore",
        "image_id": None,
    })
    reward_db.insert({
        "id": SCHED_REWARD_ID,
        "user_id": SCHED_USER_ID,
        "name": "Movie Night",
        "cost": 20,
        "image_id": None,
    })
    if has_pending:
        pending_confirmations_db.insert({
            "id": "sched_pending_id",
            "user_id": SCHED_USER_ID,
            "child_id": SCHED_CHILD_ID,
            "entity_id": SCHED_TASK_ID,
            "entity_type": "chore",
            "status": "pending",
            "approved_at": None,
        })


def cleanup_scheduler_data():
    users_db.remove(Query().id == SCHED_USER_ID)
    child_db.remove(Query().id == SCHED_CHILD_ID)
    task_db.remove(Query().id == SCHED_TASK_ID)
    reward_db.remove(Query().id == SCHED_REWARD_ID)
    pending_confirmations_db.remove(Query().user_id == SCHED_USER_ID)


@pytest.fixture
def app():
    flask_app = Flask(__name__)
    flask_app.config['TESTING'] = True
    flask_app.config['SECRET_KEY'] = TEST_SECRET_KEY
    flask_app.config['FRONTEND_URL'] = 'http://localhost:5173'
    flask_app.config['MAIL_DEFAULT_SENDER'] = 'no-reply@reward-app.local'
    return flask_app


class TestSendDigests:
    def setup_method(self):
        cleanup_scheduler_data()

    def teardown_method(self):
        cleanup_scheduler_data()

    def test_sends_digest_to_eligible_user_at_9pm(self, app):
        """Identifies verified, digest-enabled users whose local time is 9 pm and sends digest."""
        seed_scheduler_data()
        with patch('utils.digest_scheduler._get_local_hour', return_value=21), \
             patch('utils.email_sender.Mail') as mock_mail:
            send_digests(app)
        assert mock_mail.return_value.send.called

    def test_skips_user_with_no_pending_items(self, app):
        """Digest is not sent if there are no pending items."""
        seed_scheduler_data(has_pending=False)
        with patch('utils.digest_scheduler._get_local_hour', return_value=21), \
             patch('utils.email_sender.Mail') as mock_mail:
            send_digests(app)
        assert not mock_mail.return_value.send.called

    def test_skips_unverified_user(self, app):
        """Digest is not sent to unverified users."""
        seed_scheduler_data(verified=False)
        with patch('utils.digest_scheduler._get_local_hour', return_value=21), \
             patch('utils.email_sender.Mail') as mock_mail:
            send_digests(app)
        assert not mock_mail.return_value.send.called

    def test_skips_user_with_digest_disabled(self, app):
        """Digest is not sent to users who have email_digest_enabled == False."""
        seed_scheduler_data(email_digest_enabled=False)
        with patch('utils.digest_scheduler._get_local_hour', return_value=21), \
             patch('utils.email_sender.Mail') as mock_mail:
            send_digests(app)
        assert not mock_mail.return_value.send.called

    def test_skips_user_not_at_9pm(self, app):
        """Digest is not sent when the user's local time is not 21."""
        seed_scheduler_data()
        with patch('utils.digest_scheduler._get_local_hour', return_value=10), \
             patch('utils.email_sender.Mail') as mock_mail:
            send_digests(app)
        assert not mock_mail.return_value.send.called

    def test_reads_timezone_and_falls_back_to_utc(self, app):
        """_get_local_hour uses User.timezone; None falls back to UTC."""
        from utils.digest_scheduler import _get_local_hour
        from datetime import datetime, timezone as tz

        utc_hour = datetime.now(tz.utc).hour
        assert _get_local_hour(None) == utc_hour
        # A real timezone that differs from UTC (New York is UTC-4 or UTC-5)
        result = _get_local_hour("America/New_York")
        assert 0 <= result <= 23

    def test_skips_when_db_env_is_e2e(self, app):
        """Digest scheduler does nothing in the e2e test environment."""
        seed_scheduler_data()
        original = os.environ.get('DB_ENV')
        try:
            os.environ['DB_ENV'] = 'e2e'
            with patch('utils.email_sender.Mail') as mock_mail:
                send_digests(app)
            assert not mock_mail.return_value.send.called
        finally:
            if original is not None:
                os.environ['DB_ENV'] = original
            else:
                os.environ.pop('DB_ENV', None)


class TestDigestEmailHtml:
    """Tests for the HTML content of send_digest_email."""

    @pytest.fixture
    def app_ctx(self, app):
        with app.app_context():
            yield

    def _build_items(self):
        return [
            {
                'child_name': 'Alice',
                'entity_name': 'Clean Room',
                'entity_type': 'chore',
                'view_url': 'http://localhost:5173/parent/child1?scrollTo=task1&entityType=chore',
                'approve_url': 'http://localhost:5173/api/digest-action/approve_tok',
                'deny_url': 'http://localhost:5173/api/digest-action/deny_tok',
                'child_id': 'child1',
                'entity_id': 'task1',
            },
            {
                'child_name': 'Alice',
                'entity_name': 'Movie Night',
                'entity_type': 'reward',
                'view_url': 'http://localhost:5173/parent/child1?scrollTo=reward1&entityType=reward',
                'approve_url': 'http://localhost:5173/api/digest-action/approve_tok2',
                'deny_url': 'http://localhost:5173/api/digest-action/deny_tok2',
                'child_id': 'child1',
                'entity_id': 'reward1',
            },
        ]

    def test_email_contains_child_section(self, app_ctx):
        """Email HTML contains a section for each child."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        assert 'Alice' in msg.html

    def test_email_contains_item_names(self, app_ctx):
        """Email HTML lists each pending item's name."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        assert 'Clean Room' in msg.html
        assert 'Movie Night' in msg.html

    def test_email_contains_approve_and_deny_links(self, app_ctx):
        """Email HTML contains Approve and Deny links for each item."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        assert 'approve_tok' in msg.html
        assert 'deny_tok' in msg.html
        assert 'Approve' in msg.html
        assert 'Deny' in msg.html

    def test_email_contains_view_links(self, app_ctx):
        """Email HTML contains a View link for each item."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        assert 'View' in msg.html
        assert 'scrollTo=task1' in msg.html

    def test_email_contains_unsubscribe_link(self, app_ctx):
        """Email HTML footer contains the unsubscribe link."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        assert 'unsub_tok' in msg.html
        assert 'Unsubscribe' in msg.html

    def test_approve_link_styled_green(self, app_ctx):
        """Approve links use green color styling."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        # Find the Approve link and verify green color is adjacent
        assert '#22c55e' in msg.html  # green used for Approve

    def test_deny_link_styled_red(self, app_ctx):
        """Deny links use red color styling."""
        with patch('utils.email_sender.Mail') as mock_mail:
            send_digest_email(SCHED_EMAIL, self._build_items(), 'unsub_tok')
        msg = mock_mail.return_value.send.call_args[0][0]
        assert '#ef4444' in msg.html  # red used for Deny