#!/usr/bin/env python3
"""Large DSSE payload and OCI referrer edge-case deterministic suite."""

from __future__ import annotations

import argparse
import hashlib
import json
import pathlib
import tarfile
import time

import sys

TOOLS_DIR = pathlib.Path(__file__).resolve().parents[1] / "tools"
sys.path.insert(0, str(TOOLS_DIR))
from emit_artifacts import TestCaseResult, write_junit  # noqa: E402

MAX_ACCEPTED_BYTES = 50 * 1024 * 1024


def _reprocess_token(case_id: str) -> str:
    return hashlib.sha256(case_id.encode("utf-8")).hexdigest()[:20]


def _evaluate_big_payload(case_id: str, payload_size_bytes: int) -> dict[str, object]:
    if payload_size_bytes > MAX_ACCEPTED_BYTES:
        return {
            "caseId": case_id,
            "result": "rejected",
            "machineReadableErrorClass": "payload_too_large",
            "state": "unknown_state",
            "reprocessToken": _reprocess_token(case_id),
        }
    return {
        "caseId": case_id,
        "result": "accepted",
        "machineReadableErrorClass": "none",
        "state": "verified",
        "reprocessToken": None,
    }


def _evaluate_referrer_case(case_id: str, issue: str) -> dict[str, object]:
    mapping = {
        "dangling": "missing_subject",
        "invalid_media_type": "invalid_media_type",
        "cycle": "referrer_cycle_detected",
        "missing_symbol_bundle": "missing_symbol_bundle",
    }
    error_class = mapping[issue]
    return {
        "caseId": case_id,
        "result": "rejected",
        "machineReadableErrorClass": error_class,
        "state": "unknown_state",
        "reprocessToken": _reprocess_token(case_id),
    }


def _write_tar(source_dir: pathlib.Path, tar_path: pathlib.Path) -> None:
    tar_path.parent.mkdir(parents=True, exist_ok=True)
    with tarfile.open(tar_path, "w:gz") as archive:
        for file in sorted(path for path in source_dir.rglob("*") if path.is_file()):
            archive.add(file, arcname=file.relative_to(source_dir).as_posix())


def main() -> int:
    parser = argparse.ArgumentParser(description="Run deterministic large DSSE/referrer suite.")
    parser.add_argument(
        "--output",
        type=pathlib.Path,
        default=pathlib.Path("out/supply-chain/04-big-dsse-referrers"),
    )
    args = parser.parse_args()

    output = args.output.resolve()
    output.mkdir(parents=True, exist_ok=True)
    case_root = output / "cases"
    case_root.mkdir(parents=True, exist_ok=True)

    start = time.perf_counter()

    big_payload_cases = [
        ("dsse-100mb", 100 * 1024 * 1024),
        ("dsse-250mb", 250 * 1024 * 1024),
        ("dsse-1gb", 1024 * 1024 * 1024),
    ]
    referrer_cases = [
        ("referrer-dangling", "dangling"),
        ("referrer-invalid-media-type", "invalid_media_type"),
        ("referrer-cycle", "cycle"),
        ("referrer-missing-symbol-bundle", "missing_symbol_bundle"),
    ]

    results: list[dict[str, object]] = []
    junit_cases: list[TestCaseResult] = []
    failures = 0

    for case_id, size_bytes in big_payload_cases:
        case_start = time.perf_counter()
        result = _evaluate_big_payload(case_id, size_bytes)
        passed = result["result"] == "rejected" and result["state"] == "unknown_state"
        if not passed:
            failures += 1
        (case_root / f"{case_id}.json").write_text(
            json.dumps(result, sort_keys=True, indent=2) + "\n",
            encoding="utf-8",
        )
        results.append(result)
        junit_cases.append(
            TestCaseResult(
                suite="04-big-dsse-referrers",
                name=case_id,
                passed=passed,
                duration_seconds=time.perf_counter() - case_start,
                failure_message=None if passed else "payload case was not gracefully rejected",
            )
        )

    for case_id, issue in referrer_cases:
        case_start = time.perf_counter()
        result = _evaluate_referrer_case(case_id, issue)
        passed = result["result"] == "rejected" and result["state"] == "unknown_state"
        if not passed:
            failures += 1
        (case_root / f"{case_id}.json").write_text(
            json.dumps(result, sort_keys=True, indent=2) + "\n",
            encoding="utf-8",
        )
        results.append(result)
        junit_cases.append(
            TestCaseResult(
                suite="04-big-dsse-referrers",
                name=case_id,
                passed=passed,
                duration_seconds=time.perf_counter() - case_start,
                failure_message=None if passed else "referrer case was not gracefully rejected",
            )
        )

    _write_tar(case_root, output / "big_dsse_payloads.tar.gz")

    report = {
        "durationSeconds": round(time.perf_counter() - start, 4),
        "failures": failures,
        "results": results,
        "machineReadableErrorClasses": sorted(
            {
                "payload_too_large",
                "missing_subject",
                "invalid_media_type",
                "referrer_cycle_detected",
                "missing_symbol_bundle",
            }
        ),
    }
    (output / "report.json").write_text(json.dumps(report, sort_keys=True, indent=2) + "\n", encoding="utf-8")
    write_junit(output / "junit.xml", junit_cases)
    return 0 if failures == 0 else 1


if __name__ == "__main__":
    raise SystemExit(main())