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feat(BT-003A): add event comparison page

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This commit is contained in:
Bu5hm4nn
2026-03-24 19:20:35 +01:00
parent 68cb2aa51a
commit ff4e565ee6
8 changed files with 672 additions and 43 deletions
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1
app/models/backtest.py
View File

@@ -137,6 +137,7 @@ class EventComparisonRanking:
template_slug: str
template_name: str
survived_margin_call: bool
margin_call_days_hedged: int
max_ltv_hedged: float
hedge_cost: float
final_equity: float

4
app/pages/__init__.py
View File

@@ -1,3 +1,3 @@
from . import backtests, hedge, options, overview, settings
from . import backtests, event_comparison, hedge, options, overview, settings
__all__ = ["overview", "hedge", "options", "backtests", "settings"]
__all__ = ["overview", "hedge", "options", "backtests", "event_comparison", "settings"]

1
app/pages/common.py
View File

@@ -13,6 +13,7 @@ NAV_ITEMS: list[tuple[str, str, str]] = [
("hedge", "/hedge", "Hedge Analysis"),
("options", "/options", "Options Chain"),
("backtests", "/backtests", "Backtests"),
("event-comparison", "/event-comparison", "Event Comparison"),
("settings", "/settings", "Settings"),
]

238
app/pages/event_comparison.py Normal file
View File

@@ -0,0 +1,238 @@
from __future__ import annotations
from nicegui import ui
from app.pages.common import dashboard_page
from app.services.event_comparison_ui import EventComparisonPageService
def _chart_options(dates: tuple[str, ...], series: tuple[dict[str, object], ...]) -> dict:
return {
"tooltip": {"trigger": "axis"},
"legend": {"type": "scroll"},
"xAxis": {"type": "category", "data": list(dates)},
"yAxis": {"type": "value", "name": "Net value"},
"series": [
{
"name": item["name"],
"type": "line",
"smooth": True,
"data": item["values"],
}
for item in series
],
}
@ui.page("/event-comparison")
def event_comparison_page() -> None:
service = EventComparisonPageService()
preset_options = service.preset_options("GLD")
template_options = service.template_options("GLD")
preset_select_options = {str(option["slug"]): str(option["label"]) for option in preset_options}
template_select_options = {str(option["slug"]): str(option["label"]) for option in template_options}
default_preset_slug = str(preset_options[0]["slug"]) if preset_options else None
default_template_slugs = list(preset_options[0]["default_template_slugs"]) if preset_options else []
preset_lookup = {str(option["slug"]): option for option in preset_options}
with dashboard_page(
"Event Comparison",
"Thin BT-003A read-only UI over EventComparisonService with deterministic seeded GLD presets.",
"event-comparison",
):
with ui.row().classes("w-full gap-6 max-lg:flex-col"):
with ui.card().classes(
"w-full max-w-xl rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-900"
):
ui.label("Comparison Form").classes("text-lg font-semibold text-slate-900 dark:text-slate-100")
ui.label(
"Preset selection is deterministic and read-only in the sense that runs reuse seeded event windows and existing BT-003 ranking logic."
).classes("text-sm text-slate-500 dark:text-slate-400")
preset_select = ui.select(
preset_select_options,
value=default_preset_slug,
label="Event preset",
).classes("w-full")
template_select = ui.select(
template_select_options,
value=default_template_slugs,
label="Strategy templates",
multiple=True,
).classes("w-full")
ui.label("Changing the preset resets strategy templates to that preset's default comparison set.").classes(
"text-xs text-slate-500 dark:text-slate-400"
)
units_input = ui.number("Underlying units", value=1000.0, min=0.0001, step=1).classes("w-full")
loan_input = ui.number("Loan amount", value=68000.0, min=0, step=1000).classes("w-full")
ltv_input = ui.number("Margin call LTV", value=0.75, min=0.01, max=0.99, step=0.01).classes("w-full")
metadata_label = ui.label("").classes("text-sm text-slate-500 dark:text-slate-400")
scenario_label = ui.label("").classes("text-sm text-slate-500 dark:text-slate-400")
validation_label = ui.label("").classes("text-sm text-rose-600 dark:text-rose-300")
run_button = ui.button("Run comparison").props("color=primary")
result_panel = ui.column().classes("w-full gap-6")
def selected_template_slugs() -> tuple[str, ...]:
raw_value = template_select.value or []
if isinstance(raw_value, str):
return (raw_value,) if raw_value else ()
return tuple(str(item) for item in raw_value if item)
def refresh_preset_details() -> None:
option = preset_lookup.get(str(preset_select.value or ""))
if option is None:
metadata_label.set_text("")
scenario_label.set_text("")
return
template_select.value = list(service.default_template_selection(str(option["slug"])))
try:
scenario = service.preview_scenario(
preset_slug=str(option["slug"]),
template_slugs=selected_template_slugs(),
underlying_units=float(units_input.value or 0.0),
loan_amount=float(loan_input.value or 0.0),
margin_call_ltv=float(ltv_input.value or 0.0),
)
except (ValueError, KeyError) as exc:
metadata_label.set_text(f"Preset: {option['label']} — {option['description']}")
scenario_label.set_text(str(exc))
return
preset = service.event_preset_service.get_preset(str(option["slug"]))
metadata_label.set_text(f"Preset: {option['label']} — {option['description']}")
scenario_label.set_text(
"Scenario preview: "
f"{scenario.start_date.isoformat()} → {scenario.end_date.isoformat()}"
+ (
f" · Anchor date: {preset.anchor_date.isoformat()}"
if preset.anchor_date is not None
else " · Anchor date: none"
)
+ f" · Entry spot: ${scenario.initial_portfolio.entry_spot:,.2f}"
)
def render_report() -> None:
validation_label.set_text("")
result_panel.clear()
try:
report = service.run_read_only_comparison(
preset_slug=str(preset_select.value or ""),
template_slugs=selected_template_slugs(),
underlying_units=float(units_input.value or 0.0),
loan_amount=float(loan_input.value or 0.0),
margin_call_ltv=float(ltv_input.value or 0.0),
)
except (ValueError, KeyError) as exc:
validation_label.set_text(str(exc))
return
except Exception:
validation_label.set_text("Event comparison failed. Please verify the seeded inputs and try again.")
return
preset = report.event_preset
scenario = report.scenario
metadata_label.set_text(
f"Preset: {preset.display_name} ({preset.event_type}) · Tags: {', '.join(preset.tags) or 'none'}"
)
scenario_label.set_text(
"Scenario dates used: "
f"{scenario.start_date.isoformat()} → {scenario.end_date.isoformat()} · "
f"Entry spot: ${scenario.initial_portfolio.entry_spot:,.2f}"
)
chart_model = service.chart_model(report)
with result_panel:
with ui.card().classes(
"w-full rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-900"
):
ui.label("Scenario Metadata").classes("text-lg font-semibold text-slate-900 dark:text-slate-100")
with ui.grid(columns=4).classes("w-full gap-4 max-lg:grid-cols-2 max-sm:grid-cols-1"):
cards = [
("Symbol", scenario.symbol),
("Event window", f"{preset.window_start.isoformat()} → {preset.window_end.isoformat()}"),
(
"Anchor date",
preset.anchor_date.isoformat() if preset.anchor_date is not None else "None",
),
("Scenario dates used", f"{scenario.start_date.isoformat()} → {scenario.end_date.isoformat()}"),
("Underlying units", f"{scenario.initial_portfolio.underlying_units:,.0f}"),
("Loan amount", f"${scenario.initial_portfolio.loan_amount:,.0f}"),
("Margin call LTV", f"{scenario.initial_portfolio.margin_call_ltv:.1%}"),
("Templates compared", str(len(report.rankings))),
]
for label, value in cards:
with ui.card().classes(
"rounded-xl border border-slate-200 bg-slate-50 p-4 shadow-none dark:border-slate-800 dark:bg-slate-950"
):
ui.label(label).classes("text-sm text-slate-500 dark:text-slate-400")
ui.label(value).classes("text-xl font-bold text-slate-900 dark:text-slate-100")
with ui.card().classes(
"w-full rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-900"
):
ui.label("Ranked Results").classes("text-lg font-semibold text-slate-900 dark:text-slate-100")
ui.table(
columns=[
{"name": "rank", "label": "Rank", "field": "rank", "align": "right"},
{"name": "template_name", "label": "Template", "field": "template_name", "align": "left"},
{
"name": "survived_margin_call",
"label": "Survived margin call",
"field": "survived_margin_call",
"align": "center",
},
{
"name": "margin_call_days_hedged",
"label": "Hedged margin call days",
"field": "margin_call_days_hedged",
"align": "right",
},
{
"name": "max_ltv_hedged",
"label": "Max hedged LTV",
"field": "max_ltv_hedged",
"align": "right",
},
{"name": "hedge_cost", "label": "Hedge cost", "field": "hedge_cost", "align": "right"},
{
"name": "final_equity",
"label": "Final equity",
"field": "final_equity",
"align": "right",
},
],
rows=[
{
"rank": item.rank,
"template_name": item.template_name,
"survived_margin_call": "Yes" if item.survived_margin_call else "No",
"margin_call_days_hedged": item.margin_call_days_hedged,
"max_ltv_hedged": f"{item.max_ltv_hedged:.1%}",
"hedge_cost": f"${item.hedge_cost:,.0f}",
"final_equity": f"${item.final_equity:,.0f}",
}
for item in report.rankings
],
row_key="rank",
).classes("w-full")
with ui.card().classes(
"w-full rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-900"
):
ui.label("Portfolio Value Paths").classes("text-lg font-semibold text-slate-900 dark:text-slate-100")
ui.label(
"Baseline series shows the unhedged collateral value path for the same seeded event window."
).classes("text-sm text-slate-500 dark:text-slate-400")
ui.echart(
_chart_options(
chart_model.dates,
tuple(
{"name": item.name, "values": list(item.values)} for item in chart_model.series
),
)
).classes("h-96 w-full")
preset_select.on_value_change(lambda _: refresh_preset_details())
run_button.on_click(lambda: render_report())
refresh_preset_details()
render_report()

150
app/services/backtesting/comparison.py
View File

@@ -11,7 +11,7 @@ from app.models.backtest import (
TemplateRef,
)
from app.models.event_preset import EventPreset
from app.services.backtesting.historical_provider import SyntheticHistoricalProvider
from app.services.backtesting.historical_provider import DailyClosePoint, SyntheticHistoricalProvider
from app.services.backtesting.service import BacktestService
from app.services.event_presets import EventPresetService
from app.services.strategy_templates import StrategyTemplateService
@@ -48,6 +48,111 @@ class EventComparisonService:
template_slugs=template_slugs,
provider_ref=provider_ref,
)
return self._compare_materialized_event(preset=preset, scenario=scenario)
def compare_event_from_inputs(
self,
*,
preset_slug: str,
underlying_units: float,
loan_amount: float,
margin_call_ltv: float,
template_slugs: tuple[str, ...] | None = None,
currency: str = "USD",
cash_balance: float = 0.0,
financing_rate: float = 0.0,
provider_ref: ProviderRef | None = None,
) -> EventComparisonReport:
preset = self.event_preset_service.get_preset(preset_slug)
scenario = self.preview_scenario_from_inputs(
preset_slug=preset_slug,
underlying_units=underlying_units,
loan_amount=loan_amount,
margin_call_ltv=margin_call_ltv,
template_slugs=template_slugs,
currency=currency,
cash_balance=cash_balance,
financing_rate=financing_rate,
provider_ref=provider_ref,
)
return self._compare_materialized_event(preset=preset, scenario=scenario)
def preview_scenario_from_inputs(
self,
*,
preset_slug: str,
underlying_units: float,
loan_amount: float,
margin_call_ltv: float,
template_slugs: tuple[str, ...] | None = None,
currency: str = "USD",
cash_balance: float = 0.0,
financing_rate: float = 0.0,
provider_ref: ProviderRef | None = None,
) -> BacktestScenario:
preset = self.event_preset_service.get_preset(preset_slug)
history = self._load_preset_history(preset)
entry_spot = history[0].close
initial_portfolio = BacktestPortfolioState(
currency=currency,
underlying_units=underlying_units,
entry_spot=entry_spot,
loan_amount=loan_amount,
margin_call_ltv=margin_call_ltv,
cash_balance=cash_balance,
financing_rate=financing_rate,
)
return self.materialize_scenario(
preset,
initial_portfolio=initial_portfolio,
template_slugs=template_slugs,
provider_ref=provider_ref,
history=history,
)
def materialize_scenario(
self,
preset: EventPreset,
*,
initial_portfolio: BacktestPortfolioState,
template_slugs: tuple[str, ...] | None = None,
provider_ref: ProviderRef | None = None,
history: list[DailyClosePoint] | None = None,
) -> BacktestScenario:
selected_template_slugs = tuple(template_slugs or preset.scenario_overrides.default_template_slugs)
if not selected_template_slugs:
raise ValueError("Event comparison requires at least one template slug")
resolved_history = history or self._load_preset_history(preset)
scenario_portfolio = BacktestPortfolioState(
currency=initial_portfolio.currency,
underlying_units=initial_portfolio.underlying_units,
entry_spot=resolved_history[0].close,
loan_amount=initial_portfolio.loan_amount,
margin_call_ltv=initial_portfolio.margin_call_ltv,
cash_balance=initial_portfolio.cash_balance,
financing_rate=initial_portfolio.financing_rate,
)
template_refs = tuple(
TemplateRef(slug=slug, version=self.template_service.get_template(slug).version)
for slug in selected_template_slugs
)
return BacktestScenario(
scenario_id=f"event-{preset.slug}",
display_name=preset.display_name,
symbol=preset.symbol,
start_date=resolved_history[0].date,
end_date=resolved_history[-1].date,
initial_portfolio=scenario_portfolio,
template_refs=template_refs,
provider_ref=provider_ref
or ProviderRef(
provider_id=self.provider.provider_id,
pricing_mode=self.provider.pricing_mode,
),
)
def _compare_materialized_event(self, *, preset: EventPreset, scenario: BacktestScenario) -> EventComparisonReport:
run_result = self.backtest_service.run_scenario(scenario)
ranked_results = sorted(
run_result.template_results,
@@ -65,6 +170,7 @@ class EventComparisonService:
template_slug=result.template_slug,
template_name=result.template_name,
survived_margin_call=not result.summary_metrics.margin_threshold_breached_hedged,
margin_call_days_hedged=result.summary_metrics.margin_call_days_hedged,
max_ltv_hedged=result.summary_metrics.max_ltv_hedged,
hedge_cost=result.summary_metrics.total_hedge_cost,
final_equity=result.summary_metrics.end_value_hedged_net,
@@ -79,48 +185,10 @@ class EventComparisonService:
run_result=run_result,
)
def materialize_scenario(
self,
preset: EventPreset,
*,
initial_portfolio: BacktestPortfolioState,
template_slugs: tuple[str, ...] | None = None,
provider_ref: ProviderRef | None = None,
) -> BacktestScenario:
selected_template_slugs = tuple(template_slugs or preset.scenario_overrides.default_template_slugs)
if not selected_template_slugs:
raise ValueError("Event comparison requires at least one template slug")
def _load_preset_history(self, preset: EventPreset) -> list[DailyClosePoint]:
requested_start = preset.window_start - timedelta(days=preset.scenario_overrides.lookback_days or 0)
requested_end = preset.window_end + timedelta(days=preset.scenario_overrides.recovery_days or 0)
history = self.provider.load_history(preset.symbol, requested_start, requested_end)
if not history:
raise ValueError(f"No historical prices found for event preset: {preset.slug}")
scenario_portfolio = BacktestPortfolioState(
currency=initial_portfolio.currency,
underlying_units=initial_portfolio.underlying_units,
entry_spot=history[0].close,
loan_amount=initial_portfolio.loan_amount,
margin_call_ltv=initial_portfolio.margin_call_ltv,
cash_balance=initial_portfolio.cash_balance,
financing_rate=initial_portfolio.financing_rate,
)
template_refs = tuple(
TemplateRef(slug=slug, version=self.template_service.get_template(slug).version)
for slug in selected_template_slugs
)
return BacktestScenario(
scenario_id=f"event-{preset.slug}",
display_name=preset.display_name,
symbol=preset.symbol,
start_date=history[0].date,
end_date=history[-1].date,
initial_portfolio=scenario_portfolio,
template_refs=template_refs,
provider_ref=provider_ref
or ProviderRef(
provider_id=self.provider.provider_id,
pricing_mode=self.provider.pricing_mode,
),
)
return history

164
app/services/event_comparison_ui.py Normal file
View File

@@ -0,0 +1,164 @@
from __future__ import annotations
from dataclasses import dataclass
from datetime import date
from app.models.backtest import BacktestScenario, EventComparisonReport
from app.services.backtesting.comparison import EventComparisonService
from app.services.backtesting.historical_provider import DailyClosePoint, SyntheticHistoricalProvider
from app.services.event_presets import EventPresetService
from app.services.strategy_templates import StrategyTemplateService
SUPPORTED_EVENT_COMPARISON_SYMBOL = "GLD"
DETERMINISTIC_EVENT_COMPARISON_FIXTURE_HISTORY: tuple[DailyClosePoint, ...] = (
DailyClosePoint(date=date(2024, 1, 2), close=100.0),
DailyClosePoint(date=date(2024, 1, 3), close=96.0),
DailyClosePoint(date=date(2024, 1, 4), close=92.0),
DailyClosePoint(date=date(2024, 1, 5), close=88.0),
DailyClosePoint(date=date(2024, 1, 8), close=85.0),
)
FIXTURE_HISTORY_START = DETERMINISTIC_EVENT_COMPARISON_FIXTURE_HISTORY[0].date
FIXTURE_HISTORY_END = DETERMINISTIC_EVENT_COMPARISON_FIXTURE_HISTORY[-1].date
class EventComparisonFixtureHistoricalPriceSource:
def load_daily_closes(self, symbol: str, start_date: date, end_date: date) -> list[DailyClosePoint]:
normalized_symbol = symbol.strip().upper()
if normalized_symbol != SUPPORTED_EVENT_COMPARISON_SYMBOL:
raise ValueError(
"BT-003A deterministic fixture data only supports GLD event-comparison presets on this page"
)
if start_date < FIXTURE_HISTORY_START or end_date > FIXTURE_HISTORY_END:
raise ValueError(
"BT-003A deterministic fixture data only supports the seeded 2024-01-02 through 2024-01-08 window"
)
return [
point for point in DETERMINISTIC_EVENT_COMPARISON_FIXTURE_HISTORY if start_date <= point.date <= end_date
]
@dataclass(frozen=True)
class EventComparisonChartSeries:
name: str
values: tuple[float, ...]
@dataclass(frozen=True)
class EventComparisonChartModel:
dates: tuple[str, ...]
series: tuple[EventComparisonChartSeries, ...]
class EventComparisonPageService:
def __init__(
self,
comparison_service: EventComparisonService | None = None,
event_preset_service: EventPresetService | None = None,
template_service: StrategyTemplateService | None = None,
) -> None:
self.event_preset_service = event_preset_service or EventPresetService()
self.template_service = template_service or StrategyTemplateService()
if comparison_service is None:
provider = SyntheticHistoricalProvider(source=EventComparisonFixtureHistoricalPriceSource())
comparison_service = EventComparisonService(
provider=provider,
event_preset_service=self.event_preset_service,
template_service=self.template_service,
)
self.comparison_service = comparison_service
def preset_options(self, symbol: str = SUPPORTED_EVENT_COMPARISON_SYMBOL) -> list[dict[str, object]]:
return [
{
"slug": preset.slug,
"label": preset.display_name,
"description": preset.description,
"default_template_slugs": list(preset.scenario_overrides.default_template_slugs),
}
for preset in self.event_preset_service.list_presets(symbol)
]
def template_options(self, symbol: str = SUPPORTED_EVENT_COMPARISON_SYMBOL) -> list[dict[str, object]]:
return [
{
"slug": template.slug,
"label": template.display_name,
"description": template.description,
}
for template in self.template_service.list_active_templates(symbol)
]
def default_template_selection(self, preset_slug: str) -> tuple[str, ...]:
preset = self.event_preset_service.get_preset(preset_slug)
return tuple(preset.scenario_overrides.default_template_slugs)
def preview_scenario(
self,
*,
preset_slug: str,
template_slugs: tuple[str, ...],
underlying_units: float,
loan_amount: float,
margin_call_ltv: float,
) -> BacktestScenario:
return self.comparison_service.preview_scenario_from_inputs(
preset_slug=preset_slug,
template_slugs=template_slugs,
underlying_units=underlying_units,
loan_amount=loan_amount,
margin_call_ltv=margin_call_ltv,
)
def run_read_only_comparison(
self,
*,
preset_slug: str,
template_slugs: tuple[str, ...],
underlying_units: float,
loan_amount: float,
margin_call_ltv: float,
) -> EventComparisonReport:
if not preset_slug:
raise ValueError("Preset selection is required")
if underlying_units <= 0:
raise ValueError("Underlying units must be positive")
if loan_amount < 0:
raise ValueError("Loan amount must be non-negative")
if not 0 < margin_call_ltv < 1:
raise ValueError("Margin call LTV must be between 0 and 1")
preset = self.event_preset_service.get_preset(preset_slug)
normalized_symbol = preset.symbol.strip().upper()
if normalized_symbol != SUPPORTED_EVENT_COMPARISON_SYMBOL:
raise ValueError("BT-003A event comparison is currently limited to GLD on this page")
return self.comparison_service.compare_event_from_inputs(
preset_slug=preset.slug,
template_slugs=tuple(template_slugs or preset.scenario_overrides.default_template_slugs),
underlying_units=underlying_units,
loan_amount=loan_amount,
margin_call_ltv=margin_call_ltv,
)
@staticmethod
def chart_model(report: EventComparisonReport, max_ranked_series: int = 3) -> EventComparisonChartModel:
ranked = report.rankings[:max_ranked_series]
if not ranked:
return EventComparisonChartModel(dates=(), series=())
dates = tuple(point.date.isoformat() for point in ranked[0].result.daily_path)
series = [
EventComparisonChartSeries(
name="Unhedged collateral baseline",
values=tuple(round(point.underlying_value, 2) for point in ranked[0].result.daily_path),
)
]
for item in ranked:
series.append(
EventComparisonChartSeries(
name=item.template_name,
values=tuple(round(point.net_portfolio_value, 2) for point in item.result.daily_path),
)
)
return EventComparisonChartModel(dates=dates, series=tuple(series))

27
tests/test_e2e_playwright.py
View File

@@ -44,6 +44,33 @@ def test_homepage_and_options_page_render() -> None:
assert "RuntimeError" not in rerun_text
assert "Server error" not in rerun_text
page.goto(f"{BASE_URL}/event-comparison", wait_until="networkidle", timeout=30000)
expect(page.locator("text=Event Comparison").first).to_be_visible(timeout=15000)
expect(page.locator("text=Comparison Form").first).to_be_visible(timeout=15000)
expect(page.locator("text=Ranked Results").first).to_be_visible(timeout=15000)
expect(page.locator("text=Scenario Metadata").first).to_be_visible(timeout=15000)
expect(page.locator("text=Portfolio Value Paths").first).to_be_visible(timeout=15000)
event_text = page.locator("body").inner_text(timeout=15000)
assert "GLD January 2024 Selloff" in event_text
assert "Protective Put ATM" in event_text
assert "Baseline series shows the unhedged collateral value path" in event_text
assert "Hedged margin call days" in event_text
assert "Templates compared" in event_text and "4" in event_text
assert "RuntimeError" not in event_text
assert "Server error" not in event_text
assert "Traceback" not in event_text
page.get_by_label("Event preset").click()
page.get_by_text("GLD January 2024 Drawdown", exact=True).click()
page.get_by_role("button", name="Run comparison").click()
expect(page.locator("text=GLD January 2024 Drawdown").first).to_be_visible(timeout=15000)
rerun_event_text = page.locator("body").inner_text(timeout=15000)
assert "Laddered Puts 33/33/33 ATM + 95% + 90%" in rerun_event_text
assert "Templates compared" in rerun_event_text and "3" in rerun_event_text
assert "RuntimeError" not in rerun_event_text
assert "Server error" not in rerun_event_text
page.screenshot(path=str(ARTIFACTS / "event-comparison.png"), full_page=True)
page.goto(f"{BASE_URL}/options", wait_until="domcontentloaded", timeout=30000)
expect(page.locator("text=Options Chain").first).to_be_visible(timeout=15000)
expect(page.locator("text=Filters").first).to_be_visible(timeout=15000)

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from __future__ import annotations
from datetime import date
import pytest
from app.services.event_comparison_ui import EventComparisonFixtureHistoricalPriceSource, EventComparisonPageService
def test_event_comparison_page_service_runs_seeded_gld_preset_deterministically() -> None:
service = EventComparisonPageService()
report = service.run_read_only_comparison(
preset_slug="gld-jan-2024-selloff",
template_slugs=("protective-put-atm-12m", "protective-put-95pct-12m"),
underlying_units=1000.0,
loan_amount=68000.0,
margin_call_ltv=0.75,
)
assert report.event_preset.slug == "gld-jan-2024-selloff"
assert report.scenario.start_date.isoformat() == "2024-01-02"
assert report.scenario.end_date.isoformat() == "2024-01-08"
assert [item.template_slug for item in report.rankings] == [
"protective-put-atm-12m",
"protective-put-95pct-12m",
]
assert report.rankings[0].rank == 1
assert (
report.rankings[0].result.daily_path[-1].net_portfolio_value
> report.rankings[-1].result.daily_path[-1].net_portfolio_value
)
def test_event_comparison_page_service_uses_preset_default_templates_when_none_selected() -> None:
service = EventComparisonPageService()
report = service.run_read_only_comparison(
preset_slug="gld-jan-2024-selloff",
template_slugs=(),
underlying_units=1000.0,
loan_amount=68000.0,
margin_call_ltv=0.75,
)
assert [item.template_slug for item in report.rankings] == [
"protective-put-atm-12m",
"ladder-50-50-atm-95pct-12m",
"protective-put-95pct-12m",
"protective-put-90pct-12m",
]
def test_event_comparison_page_service_exposes_seeded_preset_options() -> None:
service = EventComparisonPageService()
options = service.preset_options("GLD")
assert options[0]["slug"] == "gld-jan-2024-selloff"
assert options[0]["label"] == "GLD January 2024 Selloff"
assert tuple(options[0]["default_template_slugs"]) == (
"protective-put-atm-12m",
"protective-put-95pct-12m",
"protective-put-90pct-12m",
"ladder-50-50-atm-95pct-12m",
)
def test_event_comparison_page_service_resets_template_selection_to_preset_defaults() -> None:
service = EventComparisonPageService()
assert service.default_template_selection("gld-jan-2024-selloff") == (
"protective-put-atm-12m",
"protective-put-95pct-12m",
"protective-put-90pct-12m",
"ladder-50-50-atm-95pct-12m",
)
assert service.default_template_selection("gld-jan-2024-drawdown") == (
"protective-put-atm-12m",
"ladder-50-50-atm-95pct-12m",
"ladder-33-33-33-atm-95pct-90pct-12m",
)
def test_event_comparison_page_service_preview_uses_same_materialization_path() -> None:
service = EventComparisonPageService()
scenario = service.preview_scenario(
preset_slug="gld-jan-2024-selloff",
template_slugs=("protective-put-atm-12m",),
underlying_units=1000.0,
loan_amount=68000.0,
margin_call_ltv=0.75,
)
assert scenario.start_date.isoformat() == "2024-01-02"
assert scenario.end_date.isoformat() == "2024-01-08"
assert scenario.initial_portfolio.entry_spot == 100.0
assert [ref.slug for ref in scenario.template_refs] == ["protective-put-atm-12m"]
def test_event_comparison_fixture_fails_closed_for_unsupported_range() -> None:
source = EventComparisonFixtureHistoricalPriceSource()
with pytest.raises(ValueError, match="seeded 2024-01-02 through 2024-01-08"):
source.load_daily_closes("GLD", date(2024, 1, 1), date(2024, 1, 8))
def test_event_comparison_page_service_builds_chart_model_with_unhedged_reference() -> None:
service = EventComparisonPageService()
report = service.run_read_only_comparison(
preset_slug="gld-jan-2024-selloff",
template_slugs=("protective-put-atm-12m", "protective-put-95pct-12m"),
underlying_units=1000.0,
loan_amount=68000.0,
margin_call_ltv=0.75,
)
chart_model = service.chart_model(report)
assert chart_model.dates == (
"2024-01-02",
"2024-01-03",
"2024-01-04",
"2024-01-05",
"2024-01-08",
)
assert chart_model.series[0].name == "Unhedged collateral baseline"
assert chart_model.series[1].name == "Protective Put ATM"
assert len(chart_model.series[0].values) == len(chart_model.dates)