"""Tests for the watchlist module."""

from __future__ import annotations

import json
import os

import pytest

from scanner import paths
from scanner.watchlist import (
    MAX_WATCHLIST, load_watchlist, parse_tickers, save_watchlist,
)


def test_parse_simple():
    assert parse_tickers("AAPL, MSFT, NVDA") == ["AAPL", "MSFT", "NVDA"]


def test_parse_mixed_delimiters():
    assert parse_tickers("AAPL MSFT;NVDA\nTSLA, , META") == [
        "AAPL", "MSFT", "NVDA", "TSLA", "META"]


def test_parse_lowercase_and_dedup():
    assert parse_tickers("aapl, AAPL, msft") == ["AAPL", "MSFT"]


def test_parse_rejects_invalid_symbols():
    # Starts with digit -> rejected; too long -> rejected
    assert parse_tickers("AAPL, 1MSFT, ABCDEFGHIJK, NVDA") == ["AAPL", "NVDA"]


def test_parse_empty_or_none():
    assert parse_tickers(None) == []
    assert parse_tickers("") == []
    assert parse_tickers("   ") == []


def test_parse_caps_at_max():
    many = ", ".join(f"TKR{i}" for i in range(MAX_WATCHLIST + 50))
    out = parse_tickers(many)
    assert len(out) == MAX_WATCHLIST


def test_save_and_load_round_trip():
    saved = save_watchlist(["aapl", "MSFT", "nvda"])
    assert saved == ["AAPL", "MSFT", "NVDA"]
    assert os.path.exists(paths.WATCHLIST_PATH)
    assert load_watchlist() == ["AAPL", "MSFT", "NVDA"]


def test_load_missing_returns_empty():
    assert load_watchlist() == []


def test_load_malformed_returns_empty():
    with open(paths.WATCHLIST_PATH, "w", encoding="utf-8") as fh:
        fh.write("not json")
    assert load_watchlist() == []