from __future__ import annotations

import time

import pytest

from yuxi.channels.adapters.twitch.pairing import (
    PairingStore,
    check_pairing_policy,
    format_pairing_notification,
    strip_pairing_prefix,
)


class TestStripPairingPrefix:
    def test_strips_twitch_prefix(self):
        assert strip_pairing_prefix("twitch:user123") == "user123"

    def test_strips_user_prefix(self):
        assert strip_pairing_prefix("user:user123") == "user123"

    def test_preserves_without_prefix(self):
        assert strip_pairing_prefix("user123") == "user123"

    def test_strips_case_insensitive(self):
        assert strip_pairing_prefix("TWITCH:user123") == "user123"
        assert strip_pairing_prefix("User:user123") == "user123"

    def test_empty_string(self):
        assert strip_pairing_prefix("") == ""


class TestPairingStore:
    def test_initial_state(self):
        store = PairingStore()
        assert len(store) == 0
        assert store.pending_count == 0

    def test_is_approved_false_initially(self):
        store = PairingStore()
        assert store.is_approved("user1") is False

    def test_add_pending_and_approve(self):
        store = PairingStore()
        store.add_pending("user1", "UserOne", "#chan")
        assert store.pending_count == 1
        result = store.approve("user1")
        assert result is True
        assert store.is_approved("user1") is True
        assert store.pending_count == 0

    def test_approve_triggers_callback(self):
        callback_data = {"called": False}

        def cb(user_name, channel):
            callback_data["called"] = True
            callback_data["user_name"] = user_name
            callback_data["channel"] = channel

        store = PairingStore()
        store.set_on_approve(cb, "#main_channel")
        store.add_pending("user1", "UserOne", "#chan")
        store.approve("user1", "UserOne")
        assert callback_data["called"] is True
        assert callback_data["user_name"] == "UserOne"
        assert callback_data["channel"] == "#main_channel"

    def test_approve_callback_exception_suppressed(self):
        def cb(user_name, channel):
            raise RuntimeError("test error")

        store = PairingStore()
        store.set_on_approve(cb)
        store.add_pending("user1", "UserOne", "#chan")
        result = store.approve("user1")
        assert result is True

    def test_approve_without_pending(self):
        store = PairingStore()
        result = store.approve("user1")
        assert result is True
        assert store.is_approved("user1") is True

    def test_reject_removes_pending(self):
        store = PairingStore()
        store.add_pending("user1", "UserOne", "#chan")
        result = store.reject("user1")
        assert result is True
        assert store.pending_count == 0

    def test_reject_nonexistent(self):
        store = PairingStore()
        result = store.reject("nonexistent")
        assert result is False

    def test_remove_approval(self):
        store = PairingStore()
        store.approve("user1")
        assert store.is_approved("user1") is True
        result = store.remove_approval("user1")
        assert result is True
        assert store.is_approved("user1") is False

    def test_remove_approval_nonexistent(self):
        store = PairingStore()
        result = store.remove_approval("nonexistent")
        assert result is False

    def test_get_approved_users(self):
        store = PairingStore()
        store.approve("user1")
        store.approve("user2")
        approved = store.get_approved_users()
        assert "user1" in approved
        assert "user2" in approved

    def test_get_pending_users(self):
        store = PairingStore()
        store.add_pending("user1", "U1", "#ch")
        store.add_pending("user2", "U2", "#ch")
        pending = store.get_pending_users()
        assert "user1" in pending
        assert "user2" in pending

    def test_is_pending(self):
        store = PairingStore()
        store.add_pending("user1", "U1", "#ch")
        assert store.is_pending("user1") is True
        assert store.is_pending("user2") is False

    def test_approved_expiry(self):
        store = PairingStore()
        store.APPROVED_TTL = 0.1
        store.approve("user1")
        assert store.is_approved("user1") is True
        time.sleep(0.15)
        assert store.is_approved("user1") is False

    def test_length_after_expiry(self):
        store = PairingStore()
        store.APPROVED_TTL = 0.05
        store.approve("user1")
        assert len(store) == 1
        time.sleep(0.1)
        _ = store.is_approved("user1")
        assert len(store) == 0

    def test_normalize_with_prefix(self):
        store = PairingStore()
        store.approve("twitch:user1")
        assert store.is_approved("user1") is True
        assert store.is_approved("twitch:user1") is True

    def test_max_approved_eviction(self):
        store = PairingStore()
        store.MAX_APPROVED = 3
        for i in range(5):
            store.approve(f"user{i}")
        assert len(store) <= 3

    def test_pending_expiry(self):
        store = PairingStore()
        store.PENDING_TTL = 0.05
        store.add_pending("user1", "U1", "#ch")
        assert store.pending_count == 1
        time.sleep(0.1)
        store.get_pending_users()
        assert store.pending_count == 0

    def test_approved_move_to_end(self):
        store = PairingStore()
        store.MAX_APPROVED = 2
        store.approve("user1")
        time.sleep(0.01)
        store.approve("user2")
        time.sleep(0.01)
        assert store.is_approved("user1") is True
        store.approve("user3")
        approved = store.get_approved_users()
        assert "user1" in approved
        assert "user2" not in approved


class TestCheckPairingPolicy:
    def test_approved_user(self):
        store = PairingStore()
        store.approve("user1")
        assert check_pairing_policy(store, "user1") is True

    def test_unapproved_user(self):
        store = PairingStore()
        assert check_pairing_policy(store, "user1") is False


class TestFormatPairingNotification:
    def test_formats_message(self):
        msg = format_pairing_notification("TestUser", "ABC123")
        assert "TestUser" in msg
        assert "ABC123" in msg
        assert "!approve" in msg