import asyncio

import pytest

from app.bars.models import Timeframe
from app.config import Settings
from app.market.factory import live_source, seed_source
from app.market.schwab import SchwabSource, parse_chart_futures, parse_level_one

# Shape taken from a live CHART_FUTURES message, not invented.
LIVE_MESSAGE = {
    "service": "CHART_FUTURES",
    "timestamp": 1786356976793,
    "command": "SUBS",
    "content": [
        {
            "seq": 50,
            "key": "/ES",
            "CHART_TIME_MILLIS": 1786356900000,
            "OPEN_PRICE": 7786.75,
            "HIGH_PRICE": 7787,
            "LOW_PRICE": 7786.5,
            "CLOSE_PRICE": 7787,
            "VOLUME": 107,
        }
    ],
}


def test_parses_a_live_chart_futures_message():
    bar = parse_chart_futures(LIVE_MESSAGE, "/ES")[0]

    assert bar.tf is Timeframe.M1
    assert bar.t == 1786356900  # milliseconds down to seconds
    assert (bar.o, bar.h, bar.l, bar.c) == (7786.75, 7787.0, 7786.5, 7787.0)
    assert bar.v == 107
    assert bar.symbol == "/ES"
    assert bar.source == "schwab"
    # The minute has elapsed by the time the message arrives.
    assert bar.closed is True


def test_incomplete_content_is_skipped_not_defaulted():
    # A bar invented from partial data is indistinguishable downstream from a
    # real one, which is worse than having no bar.
    for missing in ("CHART_TIME_MILLIS", "OPEN_PRICE", "CLOSE_PRICE"):
        content = dict(LIVE_MESSAGE["content"][0])
        del content[missing]
        assert parse_chart_futures({"content": [content]}, "/ES") == []


def test_schwab_offers_no_history():
    source = SchwabSource(Settings())
    assert source.supports_history() is False
    assert source.supports_stream() is True
    assert asyncio.run(source.history("/ES", Timeframe.M1, None, None)) == []


def test_seeding_stays_on_yahoo_even_when_live_is_schwab(tmp_path):
    # Schwab has no history, so the pairing is the intended configuration
    # rather than a fallback.
    settings = Settings(
        live_source="schwab",
        seed_source="schwab",
        manual_lines_path=tmp_path / "lines.json",
    )
    assert seed_source(settings).name == "yahoo"
    assert live_source(settings).name == "schwab"


def test_live_symbol_follows_the_live_source():
    # Yahoo says ES=F where Schwab says /ES; seeding always uses the Yahoo one.
    assert Settings(live_source="yahoo").live_symbol == "ES=F"
    assert Settings(live_source="schwab").live_symbol == "/ES"


def test_stream_yields_bars_from_the_socket():
    class FakeStreamClient:
        def __init__(self):
            self.handler = None
            self.subscribed = []
            self.quote_handler = None
            self.quote_subscribed = []

        async def login(self):
            return None

        def add_chart_futures_handler(self, handler):
            self.handler = handler

        async def chart_futures_subs(self, symbols):
            self.subscribed = list(symbols)

        def add_level_one_futures_handler(self, handler):
            self.quote_handler = handler

        async def level_one_futures_subs(self, symbols):
            self.quote_subscribed = list(symbols)

        async def handle_message(self):
            # One message, then idle rather than returning — a real socket
            # never stops on its own.
            if self.handler:
                self.handler(LIVE_MESSAGE)
                self.handler = None
            await asyncio.sleep(3600)

    fake = FakeStreamClient()
    source = SchwabSource(Settings(), stream_client_factory=lambda: fake)

    async def first_bar():
        async for bar in source.stream("/ES"):
            return bar

    bar = asyncio.run(asyncio.wait_for(first_bar(), timeout=10))
    assert bar.c == 7787.0
    assert fake.subscribed == ["/ES"]


def test_socket_failure_surfaces_rather_than_hanging():
    class ExplodingStreamClient:
        async def login(self):
            return None

        def add_chart_futures_handler(self, handler):
            pass

        def add_level_one_futures_handler(self, handler):
            pass

        async def level_one_futures_subs(self, symbols):
            return None

        async def chart_futures_subs(self, symbols):
            pass

        async def handle_message(self):
            raise RuntimeError("socket closed")

    source = SchwabSource(Settings(), stream_client_factory=ExplodingStreamClient)

    async def drain():
        async for _ in source.stream("/ES"):
            pass

    with pytest.raises(RuntimeError, match="socket closed"):
        asyncio.run(asyncio.wait_for(drain(), timeout=15))


# Shape taken from a live LEVEL_ONE_FUTURES message.
QUOTE_MESSAGE = {
    "service": "LEVEL_ONE_FUTURES",
    "command": "SUBS",
    "content": [
        {"key": "/ES", "LAST_PRICE": 7786.25, "LAST_SIZE": 3, "TRADE_TIME_MILLIS": 1786356930000}
    ],
}


def test_parses_a_level_one_trade():
    assert parse_level_one(QUOTE_MESSAGE) == [(1786356930000, 7786.25, 3)]


def test_quotes_without_a_trade_are_skipped():
    # A bid-only update is not a trade and must not extend a candle's range.
    bid_only = {"content": [{"key": "/ES", "BID_PRICE": 7786.0, "ASK_PRICE": 7786.5}]}
    assert parse_level_one(bid_only) == []


def test_ticks_build_an_unclosed_bar_for_the_current_minute():
    class QuotingClient:
        def __init__(self):
            self.quote_handler = None

        async def login(self):
            return None

        def add_chart_futures_handler(self, handler):
            pass

        async def chart_futures_subs(self, symbols):
            return None

        def add_level_one_futures_handler(self, handler):
            self.quote_handler = handler

        async def level_one_futures_subs(self, symbols):
            return None

        async def handle_message(self):
            if self.quote_handler:
                self.quote_handler(QUOTE_MESSAGE)
                self.quote_handler = None
            await asyncio.sleep(3600)

    source = SchwabSource(Settings(schwab_tick_seconds=0), stream_client_factory=QuotingClient)

    async def first_bar():
        async for bar in source.stream("/ES"):
            return bar

    bar = asyncio.run(asyncio.wait_for(first_bar(), timeout=10))
    # Bucketed to its minute, and explicitly not closed — the minute is still
    # running, and a closed flag would let it into the aggregator.
    assert bar.t == 1786356900
    assert bar.closed is False
    assert (bar.o, bar.h, bar.l, bar.c) == (7786.25, 7786.25, 7786.25, 7786.25)


def test_a_tick_for_an_already_closed_minute_is_ignored():
    # CHART_FUTURES is authoritative. A late tick for a minute it has already
    # settled would otherwise overwrite a real bar with a partial one.
    class LateTickClient:
        def __init__(self):
            self.chart_handler = None
            self.quote_handler = None

        async def login(self):
            return None

        def add_chart_futures_handler(self, handler):
            self.chart_handler = handler

        async def chart_futures_subs(self, symbols):
            return None

        def add_level_one_futures_handler(self, handler):
            self.quote_handler = handler

        async def level_one_futures_subs(self, symbols):
            return None

        async def handle_message(self):
            if self.chart_handler:
                self.chart_handler(LIVE_MESSAGE)          # closes 1786356900
                self.quote_handler(QUOTE_MESSAGE)         # tick inside it
                self.chart_handler = None
            await asyncio.sleep(3600)

    source = SchwabSource(Settings(schwab_tick_seconds=0), stream_client_factory=LateTickClient)

    async def two_bars():
        seen = []
        async for bar in source.stream("/ES"):
            seen.append(bar)
            if len(seen) == 1:
                # Give the late tick a chance to be wrongly emitted.
                await asyncio.sleep(0.2)
                break
        return seen

    seen = asyncio.run(asyncio.wait_for(two_bars(), timeout=10))
    assert [bar.closed for bar in seen] == [True]


def test_a_same_price_trade_keeps_its_volume():
    # Level 1 sends only changed fields, so a trade at the price of the one
    # before carries size and trade time but no LAST_PRICE. Measured live at a
    # fifth of all trades; dropping them lost that volume from the bar.
    same_price = {
        "content": [
            {"key": "/ES", "LAST_SIZE": 4, "TRADE_TIME_MILLIS": 1786356931000, "TOTAL_VOLUME": 9}
        ]
    }
    assert parse_level_one(same_price) == [(1786356931000, None, 4)]


def test_a_quote_with_neither_price_nor_trade_is_still_skipped():
    assert parse_level_one({"content": [{"key": "/ES", "BID_SIZE": 12}]}) == []