"""Pretty terminal output for `fire-planner simulate`."""
from __future__ import annotations

from fire_planner.scenarios import ScenarioSpec
from fire_planner.simulator import SimulationResult


def format_scenario(spec: ScenarioSpec, result: SimulationResult) -> str:
    """Return a multi-line string summarising one scenario's MC output."""
    lines = [
        f"Scenario: {spec.external_id}",
        f"  jurisdiction        = {spec.jurisdiction}",
        f"  strategy            = {spec.strategy}",
        f"  leave_uk_year       = {spec.leave_uk_year}",
        f"  glide_path          = {spec.glide_path}",
        f"  starting_nw_gbp     = {spec.nw_seed_gbp:>12,.0f}",
        f"  spending_target     = {spec.spending_gbp:>12,.0f}",
        f"  horizon_years       = {spec.horizon_years}",
        "  ----",
        f"  paths               = {result.n_paths:>12,}",
        f"  success_rate        = {result.success_rate*100:>11.2f}%",
        f"  p10_ending_gbp      = {result.ending_percentile(10):>12,.0f}",
        f"  p50_ending_gbp      = {result.ending_percentile(50):>12,.0f}",
        f"  p90_ending_gbp      = {result.ending_percentile(90):>12,.0f}",
        f"  median_lifetime_tax = {result.median_lifetime_tax():>12,.0f}",
    ]
    ytr = result.median_years_to_ruin()
    if ytr is not None:
        lines.append(f"  median_years_to_ruin= {ytr:>12.1f}")
    lines.append(f"  seq_risk_correlation= {result.sequence_risk_correlation():>12.4f}")
    return "\n".join(lines)