import importlib
import json
import sys
import types
from datetime import datetime, timedelta, timezone

import pytest


@pytest.fixture
def server(monkeypatch):
    started = []
    monkeypatch.setattr("threading.Thread.start", lambda self: started.append(self))
    sys.modules.pop("dashboard.server", None)
    module = importlib.import_module("dashboard.server")
    module._threads_started_during_import = started
    return module


def test_server_import_does_not_start_scheduler_threads(server):
    assert server._threads_started_during_import == []


def test_server_cache_and_history_use_reliable_persistence(server, monkeypatch, tmp_path):
    monkeypatch.setattr(server, "CACHE_PATH", str(tmp_path / "cache.json"))
    monkeypatch.setattr(server, "HISTORY_PATH", str(tmp_path / "scores.jsonl"))

    server.save_cache({"metric": {"value": 1}})
    server.append_history({
        "composite_score": 50,
        "scored_count": 1,
        "metrics": [{"key": "metric", "score": 5, "value": 1}],
    })
    server.append_history({
        "composite_score": 60,
        "scored_count": 1,
        "metrics": [{"key": "metric", "score": 6, "value": 2}],
    })

    assert server.load_cache() == {"metric": {"value": 1}}
    assert len(server.load_history()) == 1


def test_partial_fast_scrape_preserves_last_known_good_metric(server, monkeypatch, tmp_path):
    cache_path = tmp_path / "cache.json"
    history_path = tmp_path / "scores.jsonl"
    now = datetime.now(timezone.utc)
    cache_path.write_text(json.dumps({
        "price": {
            "price": 65000,
            "observed_at": (now - timedelta(minutes=15)).isoformat(),
            "source": "coingecko",
            "stale": False,
            "last_error": None,
        },
        "puell_multiple": {"value": 1.2},
        "_onchain_timestamp": now.isoformat(),
    }))
    monkeypatch.setattr(server, "CACHE_PATH", str(cache_path))
    monkeypatch.setattr(server, "HISTORY_PATH", str(history_path))
    monkeypatch.setattr(server.fear_greed, "fetch", lambda: {"value": 25})
    monkeypatch.setattr(server.price, "fetch_current", lambda: (_ for _ in ()).throw(RuntimeError("price timeout")))
    monkeypatch.setattr(server.price, "fetch_ath", lambda: {"ath": 70000})
    monkeypatch.setattr(server.price, "fetch_historical", lambda: [])
    monkeypatch.setattr(server.engine, "score_all", lambda metrics: {"composite_score": 50, "scored_count": 1, "metrics": []})
    monkeypatch.setattr(server.engine, "score_all_ml", lambda metrics: {"composite_score": 50, "scored_count": 1, "metrics": []})
    fake_updater = types.ModuleType("scrapers.history_updater")
    fake_updater.update_history = lambda: None
    monkeypatch.setitem(sys.modules, "scrapers.history_updater", fake_updater)

    server.run_scrape()

    saved = json.loads(cache_path.read_text())
    assert saved["price"]["price"] == 65000
    assert saved["price"]["stale"] is True
    assert "price timeout" in saved["price"]["last_error"]
    assert saved["fear_greed"]["value"] == 25
    assert saved["fear_greed"]["stale"] is False
    assert saved["fear_greed"]["source"] == "alternative.me"


def test_expired_onchain_timestamp_triggers_real_refresh(server, monkeypatch, tmp_path):
    old = datetime.now(timezone.utc) - timedelta(hours=7)
    cache_path = tmp_path / "cache.json"
    cache_path.write_text(json.dumps({
        "puell_multiple": {"value": 1.2},
        "_onchain_timestamp": old.isoformat(),
    }))
    monkeypatch.setattr(server, "CACHE_PATH", str(cache_path))
    monkeypatch.setattr(server, "HISTORY_PATH", str(tmp_path / "scores.jsonl"))
    monkeypatch.setattr(server.fear_greed, "fetch", lambda: {"value": 25})
    monkeypatch.setattr(server.price, "fetch_current", lambda: {"price": 65000})
    monkeypatch.setattr(server.price, "fetch_ath", lambda: {"ath": 70000})
    monkeypatch.setattr(server.price, "fetch_historical", lambda: [])
    monkeypatch.setattr(server.engine, "score_all", lambda metrics: {"composite_score": 50, "scored_count": 1, "metrics": []})
    monkeypatch.setattr(server.engine, "score_all_ml", lambda metrics: {"composite_score": 50, "scored_count": 1, "metrics": []})

    calls = []
    fake_lib = types.ModuleType("scrapers.lookintobitcoin")
    fake_lib.scrape_all = lambda: calls.append("lib") or {"puell_multiple": {"value": 0.8}}
    fake_coc = types.ModuleType("scrapers.checkonchain")
    fake_coc.scrape_all = lambda: calls.append("coc") or {"sopr": {"value": 0.99}}
    fake_updater = types.ModuleType("scrapers.history_updater")
    fake_updater.update_history = lambda: None
    import scrapers
    monkeypatch.setattr(scrapers, "lookintobitcoin", fake_lib, raising=False)
    monkeypatch.setattr(scrapers, "checkonchain", fake_coc, raising=False)
    monkeypatch.setitem(sys.modules, "scrapers.lookintobitcoin", fake_lib)
    monkeypatch.setitem(sys.modules, "scrapers.checkonchain", fake_coc)
    monkeypatch.setitem(sys.modules, "scrapers.history_updater", fake_updater)

    server.run_scrape()

    assert calls == ["lib", "coc"]
    saved = json.loads(cache_path.read_text())
    assert saved["puell_multiple"]["value"] == 0.8
    assert saved["puell_multiple"]["source"] == "lookintobitcoin"
    assert saved["sopr"]["source"] == "checkonchain"
    assert saved["_onchain_timestamp"] != old.isoformat()