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

import argparse
import json
from collections import Counter
from dataclasses import asdict
from datetime import datetime
from pathlib import Path

from inire.tests.example_scenarios import TRACE_PERFORMANCE_SCENARIO_RUNS, TRACE_SCENARIO_RUNS


def _trace_registry(include_performance_only: bool) -> tuple[tuple[str, object], ...]:
    if include_performance_only:
        return TRACE_SCENARIO_RUNS + TRACE_PERFORMANCE_SCENARIO_RUNS
    return TRACE_SCENARIO_RUNS


def _selected_runs(
    selected_scenarios: tuple[str, ...] | None,
    *,
    include_performance_only: bool,
) -> tuple[tuple[str, object], ...]:
    if selected_scenarios is None:
        perf_registry = dict(TRACE_PERFORMANCE_SCENARIO_RUNS)
        return (
            (
                "example_07_large_scale_routing_no_warm_start",
                perf_registry["example_07_large_scale_routing_no_warm_start"],
            ),
            (
                "example_07_large_scale_routing_no_warm_start_seed43",
                perf_registry["example_07_large_scale_routing_no_warm_start_seed43"],
            ),
        )

    registry = dict(TRACE_SCENARIO_RUNS + TRACE_PERFORMANCE_SCENARIO_RUNS)
    allowed_standard = dict(_trace_registry(include_performance_only))
    runs = []
    for name in selected_scenarios:
        if name in allowed_standard:
            runs.append((name, allowed_standard[name]))
            continue
        if name in registry:
            runs.append((name, registry[name]))
            continue
        valid = ", ".join(sorted(registry))
        raise SystemExit(f"Unknown iteration-trace scenario: {name}. Valid scenarios: {valid}")
    return tuple(runs)


def _build_payload(
    selected_scenarios: tuple[str, ...] | None,
    *,
    include_performance_only: bool,
) -> dict[str, object]:
    scenarios = []
    for name, run in _selected_runs(selected_scenarios, include_performance_only=include_performance_only):
        result = run()
        scenarios.append(
            {
                "name": name,
                "summary": {
                    "total_results": len(result.results_by_net),
                    "valid_results": sum(1 for entry in result.results_by_net.values() if entry.is_valid),
                    "reached_targets": sum(1 for entry in result.results_by_net.values() if entry.reached_target),
                },
                "metrics": asdict(result.metrics),
                "iteration_trace": [asdict(entry) for entry in result.iteration_trace],
            }
        )
    return {
        "generated_at": datetime.now().astimezone().isoformat(timespec="seconds"),
        "generator": "scripts/record_iteration_trace.py",
        "scenarios": scenarios,
    }


def _render_markdown(payload: dict[str, object]) -> str:
    lines = [
        "# Iteration Trace",
        "",
        f"Generated at {payload['generated_at']} by `{payload['generator']}`.",
        "",
    ]

    for scenario in payload["scenarios"]:
        lines.extend(
            [
                f"## {scenario['name']}",
                "",
                f"Results: {scenario['summary']['valid_results']} valid / "
                f"{scenario['summary']['reached_targets']} reached / "
                f"{scenario['summary']['total_results']} total.",
                "",
                "| Iteration | Penalty | Routed Nets | Completed | Conflict Edges | Dynamic Collisions | Nodes | Congestion Checks | Candidate Ids | Exact Pairs |",
                "| --: | --: | --: | --: | --: | --: | --: | --: | --: | --: |",
            ]
        )

        net_node_counts: Counter[str] = Counter()
        net_check_counts: Counter[str] = Counter()
        for entry in scenario["iteration_trace"]:
            lines.append(
                "| "
                f"{entry['iteration']} | "
                f"{entry['congestion_penalty']:.1f} | "
                f"{len(entry['routed_net_ids'])} | "
                f"{entry['completed_nets']} | "
                f"{entry['conflict_edges']} | "
                f"{entry['total_dynamic_collisions']} | "
                f"{entry['nodes_expanded']} | "
                f"{entry['congestion_check_calls']} | "
                f"{entry['congestion_candidate_ids']} | "
                f"{entry['congestion_exact_pair_checks']} |"
            )
            for attempt in entry["net_attempts"]:
                net_node_counts[attempt["net_id"]] += attempt["nodes_expanded"]
                net_check_counts[attempt["net_id"]] += attempt["congestion_check_calls"]

        lines.extend(["", "Top nets by iteration-attributed nodes expanded:", ""])
        if net_node_counts:
            for net_id, count in net_node_counts.most_common(10):
                lines.append(f"- `{net_id}`: {count}")
        else:
            lines.append("- None")

        lines.extend(["", "Top nets by iteration-attributed congestion checks:", ""])
        if net_check_counts:
            for net_id, count in net_check_counts.most_common(10):
                lines.append(f"- `{net_id}`: {count}")
        else:
            lines.append("- None")

        lines.append("")

    return "\n".join(lines)


def main() -> None:
    parser = argparse.ArgumentParser(description="Record iteration-trace artifacts for selected trace scenarios.")
    parser.add_argument(
        "--scenario",
        action="append",
        dest="scenarios",
        default=[],
        help="Optional trace scenario name to include. May be passed more than once.",
    )
    parser.add_argument(
        "--include-performance-only",
        action="store_true",
        help="Include performance-only trace scenarios when selecting from the standard registry.",
    )
    parser.add_argument(
        "--output-dir",
        type=Path,
        default=None,
        help="Directory to write iteration_trace.json and iteration_trace.md into. Defaults to <repo>/docs.",
    )
    args = parser.parse_args()

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

    selected = tuple(args.scenarios) if args.scenarios else None
    payload = _build_payload(selected, include_performance_only=args.include_performance_only)
    json_path = output_dir / "iteration_trace.json"
    markdown_path = output_dir / "iteration_trace.md"

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

    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()