#!/usr/bin/env python3
"""Publish titan-iac quality-gate results to Pushgateway."""

from __future__ import annotations

import json
import os
from glob import glob
import urllib.error
import urllib.request
import xml.etree.ElementTree as ET


def _escape_label(value: str) -> str:
    """Escape a Prometheus label value without changing its content."""
    return value.replace("\\", "\\\\").replace("\n", "\\n").replace('"', '\\"')


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


def _read_text(url: str) -> str:
    """Fetch a plain-text response body from the given URL."""
    with urllib.request.urlopen(url, timeout=10) as response:
        return response.read().decode("utf-8")


def _post_text(url: str, payload: str) -> None:
    """PUT a plain-text payload and fail on any 4xx/5xx response."""
    request = urllib.request.Request(
        url,
        data=payload.encode("utf-8"),
        method="PUT",
        headers={"Content-Type": "text/plain"},
    )
    with urllib.request.urlopen(request, timeout=10) as response:
        if response.status >= 400:
            raise RuntimeError(f"push failed with status={response.status}")


def _parse_junit(path: str) -> dict[str, int]:
    """Parse a JUnit XML file into aggregate test counters."""
    if not os.path.exists(path):
        return {"tests": 0, "failures": 0, "errors": 0, "skipped": 0}

    tree = ET.parse(path)
    root = tree.getroot()
    totals = {"tests": 0, "failures": 0, "errors": 0, "skipped": 0}

    suites: list[ET.Element]
    if root.tag == "testsuite":
        suites = [root]
    elif root.tag == "testsuites":
        suites = [elem for elem in root if elem.tag == "testsuite"]
    else:
        suites = []

    for suite in suites:
        for key in totals:
            raw_value = suite.attrib.get(key, "0")
            try:
                totals[key] += int(float(raw_value))
            except ValueError:
                totals[key] += 0
    return totals


def _collect_junit_totals(pattern: str) -> dict[str, int]:
    """Sum JUnit counters across every XML file matching the pattern."""
    totals = {"tests": 0, "failures": 0, "errors": 0, "skipped": 0}
    for path in sorted(glob(pattern)):
        parsed = _parse_junit(path)
        for key in totals:
            totals[key] += parsed[key]
    return totals


def _read_exit_code(path: str) -> int:
    """Read the quality-gate exit code, defaulting to failure if missing."""
    try:
        with open(path, "r", encoding="utf-8") as handle:
            return int(handle.read().strip())
    except (FileNotFoundError, ValueError):
        return 1


def _load_summary(path: str) -> dict:
    """Load the JSON quality-gate summary, returning an empty mapping on error."""
    try:
        with open(path, "r", encoding="utf-8") as handle:
            return json.load(handle)
    except (FileNotFoundError, json.JSONDecodeError):
        return {}


def _summary_float(summary: dict, key: str) -> float:
    """Extract a float-like value from the summary, defaulting to 0.0."""
    value = summary.get(key)
    if isinstance(value, (int, float)):
        return float(value)
    return 0.0


def _summary_int(summary: dict, key: str) -> int:
    """Extract an int-like value from the summary, defaulting to 0."""
    value = summary.get(key)
    if isinstance(value, int):
        return value
    if isinstance(value, float):
        return int(value)
    return 0


def _fetch_existing_counter(pushgateway_url: str, metric: str, labels: dict[str, str]) -> float:
    """Return the current counter value for a labeled metric if present."""
    text = _read_text(f"{pushgateway_url.rstrip('/')}/metrics")
    for line in text.splitlines():
        if not line.startswith(metric + "{"):
            continue
        if any(f'{key}="{value}"' not in line for key, value in labels.items()):
            continue
        parts = line.split()
        if len(parts) < 2:
            continue
        try:
            return float(parts[1])
        except ValueError:
            return 0.0
    return 0.0


def _build_payload(
    suite: str,
    status: str,
    tests: dict[str, int],
    ok_count: int,
    failed_count: int,
    branch: str,
    build_number: str,
    summary: dict | None = None,
    workspace_line_coverage_percent: float = 0.0,
    source_lines_over_500: int = 0,
) -> str:
    """Build the Pushgateway payload for the current suite run."""
    passed = max(tests["tests"] - tests["failures"] - tests["errors"] - tests["skipped"], 0)
    build_labels = _label_str(
        {
            "suite": suite,
            "branch": branch or "unknown",
            "build_number": build_number or "unknown",
        }
    )
    lines = [
        "# TYPE platform_quality_gate_runs_total counter",
        f'platform_quality_gate_runs_total{{suite="{suite}",status="ok"}} {ok_count}',
        f'platform_quality_gate_runs_total{{suite="{suite}",status="failed"}} {failed_count}',
        "# TYPE titan_iac_quality_gate_tests_total gauge",
        f'titan_iac_quality_gate_tests_total{{suite="{suite}",result="passed"}} {passed}',
        f'titan_iac_quality_gate_tests_total{{suite="{suite}",result="failed"}} {tests["failures"]}',
        f'titan_iac_quality_gate_tests_total{{suite="{suite}",result="error"}} {tests["errors"]}',
        f'titan_iac_quality_gate_tests_total{{suite="{suite}",result="skipped"}} {tests["skipped"]}',
        "# TYPE titan_iac_quality_gate_run_status gauge",
        f'titan_iac_quality_gate_run_status{{suite="{suite}",status="ok"}} {1 if status == "ok" else 0}',
        f'titan_iac_quality_gate_run_status{{suite="{suite}",status="failed"}} {1 if status == "failed" else 0}',
        "# TYPE titan_iac_quality_gate_build_info gauge",
        f"titan_iac_quality_gate_build_info{build_labels} 1",
        "# TYPE platform_quality_gate_workspace_line_coverage_percent gauge",
        f'platform_quality_gate_workspace_line_coverage_percent{{suite="{suite}"}} {workspace_line_coverage_percent:.3f}',
        "# TYPE platform_quality_gate_source_lines_over_500_total gauge",
        f'platform_quality_gate_source_lines_over_500_total{{suite="{suite}"}} {source_lines_over_500}',
    ]
    results = summary.get("results", []) if isinstance(summary, dict) else []
    if results:
        lines.append("# TYPE titan_iac_quality_gate_checks_total gauge")
        for result in results:
            check_name = result.get("name")
            check_status = result.get("status")
            if not check_name or not check_status:
                continue
            lines.append(
                f'titan_iac_quality_gate_checks_total{{suite="{suite}",check="{_escape_label(str(check_name))}",result="{_escape_label(str(check_status))}"}} 1'
            )
    return "\n".join(lines) + "\n"


def main() -> int:
    """Publish the quality-gate metrics and print a compact run summary."""
    suite = os.getenv("SUITE_NAME", "titan_iac")
    pushgateway_url = os.getenv("PUSHGATEWAY_URL", "http://platform-quality-gateway.monitoring.svc.cluster.local:9091")
    job_name = os.getenv("QUALITY_GATE_JOB_NAME", "platform-quality-ci")
    junit_glob = os.getenv("JUNIT_GLOB", os.getenv("JUNIT_PATH", "build/junit-*.xml"))
    exit_code_path = os.getenv("QUALITY_GATE_EXIT_CODE_PATH", os.getenv("GLUE_EXIT_CODE_PATH", "build/quality-gate.rc"))
    summary_path = os.getenv("QUALITY_GATE_SUMMARY_PATH", "build/quality-gate-summary.json")
    branch = os.getenv("BRANCH_NAME", os.getenv("GIT_BRANCH", ""))
    build_number = os.getenv("BUILD_NUMBER", "")

    tests = _collect_junit_totals(junit_glob)
    exit_code = _read_exit_code(exit_code_path)
    status = "ok" if exit_code == 0 else "failed"
    summary = _load_summary(summary_path)
    workspace_line_coverage_percent = _summary_float(summary, "workspace_line_coverage_percent")
    source_lines_over_500 = _summary_int(summary, "source_lines_over_500")

    ok_count = int(
        _fetch_existing_counter(
            pushgateway_url,
            "platform_quality_gate_runs_total",
            {"job": job_name, "suite": suite, "status": "ok"},
        )
    )
    failed_count = int(
        _fetch_existing_counter(
            pushgateway_url,
            "platform_quality_gate_runs_total",
            {"job": job_name, "suite": suite, "status": "failed"},
        )
    )
    if status == "ok":
        ok_count += 1
    else:
        failed_count += 1

    payload = _build_payload(
        suite=suite,
        status=status,
        tests=tests,
        ok_count=ok_count,
        failed_count=failed_count,
        branch=branch,
        build_number=build_number,
        summary=summary,
        workspace_line_coverage_percent=workspace_line_coverage_percent,
        source_lines_over_500=source_lines_over_500,
    )
    push_url = f"{pushgateway_url.rstrip('/')}/metrics/job/{job_name}/suite/{suite}"
    _post_text(push_url, payload)

    summary = {
        "suite": suite,
        "status": status,
        "tests_total": tests["tests"],
        "tests_failed": tests["failures"],
        "tests_error": tests["errors"],
        "tests_skipped": tests["skipped"],
        "ok_count": ok_count,
        "failed_count": failed_count,
        "checks_recorded": len(summary.get("results", [])) if isinstance(summary, dict) else 0,
        "workspace_line_coverage_percent": workspace_line_coverage_percent,
        "source_lines_over_500": source_lines_over_500,
    }
    print(json.dumps(summary, sort_keys=True))
    return 0


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