#!/usr/bin/env python3
"""Publish Metis quality-gate test metrics to Pushgateway (Prometheus ingest)."""

from __future__ import annotations

import json
import os
import urllib.request
import xml.etree.ElementTree as ET


def _escape_label(value: str) -> str:
    return value.replace("\\", "\\\\").replace("\n", "\\n").replace('"', '\\"')


def _label_str(labels: dict[str, str]) -> str:
    parts = [f'{key}="{_escape_label(val)}"' for key, val in labels.items() if val]
    return "{" + ",".join(parts) + "}" if parts else ""


def _load_coverage(path: str) -> float:
    with open(path, "r", encoding="utf-8") as handle:
        payload = json.load(handle)
    summary = payload.get("summary") or {}
    percent = summary.get("percent_covered")
    if isinstance(percent, (int, float)):
        return float(percent)
    raise RuntimeError("coverage summary missing percent_covered")


def _load_junit(path: str) -> dict[str, int]:
    tree = ET.parse(path)
    root = tree.getroot()

    def _as_int(node: ET.Element, name: str) -> int:
        raw = node.attrib.get(name) or "0"
        try:
            return int(float(raw))
        except ValueError:
            return 0

    if root.tag == "testsuite":
        suites = [root]
    elif root.tag == "testsuites":
        suites = list(root.findall("testsuite"))
    else:
        suites = []

    totals = {"tests": 0, "failures": 0, "errors": 0, "skipped": 0}
    for suite in suites:
        totals["tests"] += _as_int(suite, "tests")
        totals["failures"] += _as_int(suite, "failures")
        totals["errors"] += _as_int(suite, "errors")
        totals["skipped"] += _as_int(suite, "skipped")
    return totals


def _load_exit_code(path: str) -> int | None:
    if not path or not os.path.exists(path):
        return None
    with open(path, "r", encoding="utf-8") as handle:
        raw = handle.read().strip()
    if not raw:
        return None
    try:
        return int(raw)
    except ValueError as exc:
        raise RuntimeError(f"invalid test exit code {raw!r} in {path}") from exc


def _post_text(url: str, payload: str) -> None:
    req = urllib.request.Request(
        url,
        data=payload.encode("utf-8"),
        method="POST",
        headers={"Content-Type": "text/plain"},
    )
    with urllib.request.urlopen(req, timeout=10) as resp:
        if resp.status >= 400:
            raise RuntimeError(f"metrics push failed status={resp.status}")


def main() -> int:
    coverage_path = os.getenv("COVERAGE_JSON", "build/coverage.json")
    junit_path = os.getenv("JUNIT_XML", "build/junit.xml")
    test_exit_code_path = os.getenv("TEST_EXIT_CODE_PATH", "build/test.exitcode")
    pushgateway_url = os.getenv(
        "PUSHGATEWAY_URL", "http://platform-quality-gateway.monitoring.svc.cluster.local:9091"
    ).strip()
    suite = os.getenv("SUITE_NAME", "metis")
    branch = os.getenv("BRANCH_NAME", "")
    build_number = os.getenv("BUILD_NUMBER", "")
    commit = os.getenv("GIT_COMMIT", "")
    strict = os.getenv("METRICS_STRICT", "") == "1"

    if not os.path.exists(coverage_path):
        raise RuntimeError(f"missing coverage file {coverage_path}")
    if not os.path.exists(junit_path):
        raise RuntimeError(f"missing junit file {junit_path}")

    coverage = _load_coverage(coverage_path)
    totals = _load_junit(junit_path)
    test_exit_code = _load_exit_code(test_exit_code_path)
    passed = max(totals["tests"] - totals["failures"] - totals["errors"] - totals["skipped"], 0)

    outcome = "ok"
    if (
        (test_exit_code is not None and test_exit_code != 0)
        or totals["tests"] <= 0
        or totals["failures"] > 0
        or totals["errors"] > 0
    ):
        outcome = "failed"

    labels = {
        "job": "platform-quality-ci",
        "suite": suite,
        "branch": branch,
        "build_number": build_number,
        "commit": commit,
    }
    payload_lines = [
        "# TYPE metis_quality_gate_tests_total gauge",
        f'metis_quality_gate_tests_total{{suite="{suite}",result="total"}} {totals["tests"]}',
        f'metis_quality_gate_tests_total{{suite="{suite}",result="passed"}} {passed}',
        f'metis_quality_gate_tests_total{{suite="{suite}",result="failed"}} {totals["failures"]}',
        f'metis_quality_gate_tests_total{{suite="{suite}",result="error"}} {totals["errors"]}',
        f'metis_quality_gate_tests_total{{suite="{suite}",result="skipped"}} {totals["skipped"]}',
        "# TYPE metis_quality_gate_run_status gauge",
        f'metis_quality_gate_run_status{{suite="{suite}",status="ok"}} {1 if outcome == "ok" else 0}',
        f'metis_quality_gate_run_status{{suite="{suite}",status="failed"}} {1 if outcome == "failed" else 0}',
        "# TYPE metis_quality_gate_coverage_percent gauge",
        f'metis_quality_gate_coverage_percent{{suite="{suite}"}} {coverage:.3f}',
        "# TYPE metis_quality_gate_build_info gauge",
        f"metis_quality_gate_build_info{_label_str(labels)} 1",
    ]
    payload = "\n".join(payload_lines) + "\n"

    try:
        _post_text(f"{pushgateway_url.rstrip('/')}/metrics/job/{labels['job']}/suite/{suite}", payload)
    except Exception as exc:
        print(f"metrics push failed: {exc}")
        if strict:
            raise

    print(
        json.dumps(
            {
                "suite": suite,
                "outcome": outcome,
                "tests_total": totals["tests"],
                "tests_passed": passed,
                "tests_failed": totals["failures"],
                "tests_errors": totals["errors"],
                "tests_skipped": totals["skipped"],
                "coverage_percent": round(coverage, 3),
                "test_exit_code": test_exit_code,
            },
            indent=2,
        )
    )
    return 0


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