#!/usr/bin/env python3
from __future__ import annotations

import argparse
import json
from dataclasses import asdict
from datetime import date
from pathlib import Path

from inire.tests.example_scenarios import SCENARIO_SNAPSHOTS


SUMMARY_METRICS = (
    "route_iterations",
    "nets_routed",
    "nodes_expanded",
    "ray_cast_calls",
    "moves_generated",
    "moves_added",
    "dynamic_tree_rebuilds",
    "visibility_builds",
    "congestion_check_calls",
    "verify_path_report_calls",
)


def _build_payload(selected_scenarios: tuple[str, ...] | None = None) -> dict[str, object]:
    allowed = None if selected_scenarios is None else set(selected_scenarios)
    snapshots = []
    for name, run in SCENARIO_SNAPSHOTS:
        if allowed is not None and name not in allowed:
            continue
        snapshots.append(run())
    return {
        "generated_on": date.today().isoformat(),
        "generator": "scripts/record_performance_baseline.py",
        "scenarios": [asdict(snapshot) for snapshot in snapshots],
    }


def _render_markdown(payload: dict[str, object]) -> str:
    rows = payload["scenarios"]
    lines = [
        "# Performance Baseline",
        "",
        f"Generated on {payload['generated_on']} by `{payload['generator']}`.",
        "",
        "The full machine-readable snapshot lives in `docs/performance_baseline.json`.",
        "Use `scripts/diff_performance_baseline.py` to compare a fresh run against that snapshot.",
        "",
        "| Scenario | Duration (s) | Total | Valid | Reached | Iter | Nets Routed | Nodes | Ray Casts | Moves Gen | Moves Added | Dyn Tree | Visibility Builds | Congestion Checks | Verify Calls |",
        "| :-- | --: | --: | --: | --: | --: | --: | --: | --: | --: | --: | --: | --: | --: | --: |",
    ]
    for row in rows:
        metrics = row["metrics"]
        lines.append(
            "| "
            f"{row['name']} | "
            f"{row['duration_s']:.4f} | "
            f"{row['total_results']} | "
            f"{row['valid_results']} | "
            f"{row['reached_targets']} | "
            f"{metrics['route_iterations']} | "
            f"{metrics['nets_routed']} | "
            f"{metrics['nodes_expanded']} | "
            f"{metrics['ray_cast_calls']} | "
            f"{metrics['moves_generated']} | "
            f"{metrics['moves_added']} | "
            f"{metrics['dynamic_tree_rebuilds']} | "
            f"{metrics['visibility_builds']} | "
            f"{metrics['congestion_check_calls']} | "
            f"{metrics['verify_path_report_calls']} |"
        )

    lines.extend(
        [
            "",
            "## Full Counter Set",
            "",
            "Each scenario entry in `docs/performance_baseline.json` records the full `RouteMetrics` snapshot, including cache, index, congestion, and verification counters.",
            "These counters are currently observational only and are not enforced as CI regression gates.",
            "",
            "Tracked metric keys:",
            "",
            ", ".join(rows[0]["metrics"].keys()) if rows else "",
        ]
    )
    return "\n".join(lines) + "\n"


def main() -> None:
    parser = argparse.ArgumentParser(description="Record the example-scenario performance baseline.")
    parser.add_argument(
        "--output-dir",
        type=Path,
        default=None,
        help="Directory to write performance_baseline.json and performance.md into. Defaults to <repo>/docs.",
    )
    parser.add_argument(
        "--scenario",
        action="append",
        dest="scenarios",
        default=[],
        help="Optional scenario name to include. May be passed more than once.",
    )
    args = parser.parse_args()

    repo_root = Path(__file__).resolve().parents[1]
    docs_dir = repo_root / "docs" if args.output_dir is None else args.output_dir.resolve()
    docs_dir.mkdir(exist_ok=True)

    selected = tuple(args.scenarios) if args.scenarios else None
    payload = _build_payload(selected)
    json_path = docs_dir / "performance_baseline.json"
    markdown_path = docs_dir / "performance.md"

    json_path.write_text(json.dumps(payload, indent=2, sort_keys=True) + "\n")
    markdown_path.write_text(_render_markdown(payload))

    if json_path.is_relative_to(repo_root):
        print(f"Wrote {json_path.relative_to(repo_root)}")
    else:
        print(f"Wrote {json_path}")
    if markdown_path.is_relative_to(repo_root):
        print(f"Wrote {markdown_path.relative_to(repo_root)}")
    else:
        print(f"Wrote {markdown_path}")


if __name__ == "__main__":
    main()