"""Summarize a profile run as markdown, comparing to the previous run in data_dir.

Usage: python report.py <results.jsonl> <data_dir> > summary.md
"""

import json
import sys
from pathlib import Path


def load(path):
    return [json.loads(line) for line in Path(path).read_text().splitlines()]


def table(rows, key, unit, n=20):
    lines = [f"| test | {key} ({unit}) | outcome |", "|---|---:|---|"]
    for r in sorted(rows, key=lambda r: r[key], reverse=True)[:n]:
        lines.append(f"| `{r['nodeid']}` | {r[key]:.1f} | {r['outcome']} |")
    return "\n".join(lines)


current_path, data_dir = Path(sys.argv[1]), Path(sys.argv[2])
rows = load(current_path)
meta = rows[0]
previous = sorted(p for p in data_dir.glob("*.jsonl") if p.name != current_path.name)

out = [f"# CI profile {meta['date']} @ {meta['sha'][:8]}", ""]
out.append(
    f"{len(rows)} tests, {sum(r['total_s'] for r in rows) / 60:.1f} min total, "
    f"{sum(r['outcome'] == 'failed' for r in rows)} failed, {sum(r['outcome'] == 'error' for r in rows)} errors, "
    f"{sum(r['outcome'] == 'skipped' for r in rows)} skipped. "
    f"torch {meta['torch']}, transformers {meta['transformers']}, {meta['gpu']}."
)
out += ["", "## Slowest tests", "", table(rows, "total_s", "s")]
out += ["", "## Highest peak memory", "", table(rows, "peak_alloc_mib", "MiB")]

if previous:
    prev = {r["nodeid"]: r for r in load(previous[-1])}
    slower, heavier = [], []
    for r in rows:
        p = prev.get(r["nodeid"])
        if p is None or r["outcome"] != "passed" or p["outcome"] != "passed":
            continue
        if r["total_s"] > 1.5 * p["total_s"] and r["total_s"] - p["total_s"] > 5:
            slower.append(f"| `{r['nodeid']}` | {p['total_s']:.1f} | {r['total_s']:.1f} |")
        if r["peak_alloc_mib"] > 1.2 * p["peak_alloc_mib"] and r["peak_alloc_mib"] - p["peak_alloc_mib"] > 256:
            heavier.append(f"| `{r['nodeid']}` | {p['peak_alloc_mib']:.0f} | {r['peak_alloc_mib']:.0f} |")
    out += ["", f"## Regressions vs {previous[-1].stem}", ""]
    out += ["Time (>1.5x and >5 s):", "", "| test | before (s) | now (s) |", "|---|---:|---:|", *slower, ""]
    out += ["Peak memory (>1.2x and >256 MiB):", "", "| test | before (MiB) | now (MiB) |", "|---|---:|---:|", *heavier]

print("\n".join(out))