#!/usr/bin/env python3
"""
Jira Data Consistency Monitoring Script

Validates data integrity by comparing three sources:
1. Jira API (ground truth)
2. Raw JSON files (/data/src_data/raw/jira/issues/*.json)
3. Parquet files (/data/src_data/parquet/jira/issues/*.parquet)

Automatically backfills small gaps (1-10 issues), alerts on large ones (11+).
Runs every 30 minutes via systemd timer to detect webhook losses and transform failures.

Usage:
    # Dry run (check only, no fixes)
    python -m connectors.jira.scripts.consistency_check --dry-run --max-age-days 7

    # Auto-fix mode (default)
    python -m connectors.jira.scripts.consistency_check --auto-fix --max-age-days 30

    # Weekly deep check (full history)
    python -m connectors.jira.scripts.consistency_check --auto-fix --max-age-days 365

Environment variables (loaded from .env):
    JIRA_DOMAIN - Jira Cloud domain (e.g., your-org.atlassian.net)
    JIRA_EMAIL - Email for API authentication
    JIRA_API_TOKEN - API token from Atlassian
    JIRA_DATA_DIR - Directory for storing data (default: /data/src_data/raw/jira)
"""

import argparse
import json
import logging
import os
import subprocess
import sys
import tempfile
import time
from dataclasses import dataclass
from datetime import datetime, timedelta, timezone
from pathlib import Path

import httpx
from dotenv import load_dotenv

# Try to import DuckDB for Parquet queries
try:
    import duckdb

    HAS_DUCKDB = True
except ImportError:
    HAS_DUCKDB = False
    logging.warning("DuckDB not available, Parquet validation will be skipped")

from app.logging_config import setup_logging

setup_logging(__name__)
logger = logging.getLogger(__name__)


@dataclass
class Config:
    """Configuration loaded from environment."""

    jira_domain: str
    jira_email: str
    jira_api_token: str
    raw_dir: Path
    parquet_dir: Path
    repo_dir: Path
    venv_python: Path

    @classmethod
    def from_env(cls) -> "Config":
        """Load configuration from environment variables."""
        # Try to load .env file from common locations.
        # Customer-specific install paths (e.g. /opt/<deployment>/.env) can be
        # injected via the AGNES_ENV_FILE env var without editing this list.
        env_paths = [
            Path(os.environ["AGNES_ENV_FILE"]) if os.environ.get("AGNES_ENV_FILE") else None,
            Path.cwd() / ".env",
            Path(__file__).parent.parent / ".env",
        ]
        env_paths = [p for p in env_paths if p is not None]
        for env_path in env_paths:
            if env_path.exists():
                load_dotenv(env_path)
                logger.info(f"Loaded environment from {env_path}")
                break

        # Validate required variables
        required = ["JIRA_DOMAIN", "JIRA_EMAIL", "JIRA_API_TOKEN"]
        missing = [var for var in required if not os.environ.get(var)]
        if missing:
            raise ValueError(f"Missing required environment variables: {', '.join(missing)}")

        raw_dir = Path(os.environ.get("JIRA_DATA_DIR", "/data/src_data/raw/jira"))
        parquet_dir = Path(os.environ.get("JIRA_PARQUET_DIR", "/data/src_data/parquet/jira"))
        # REPO_DIR / VENV_PYTHON have no sensible OSS default — operators
        # must export them when running this script outside an editable
        # checkout.
        repo_dir = Path(os.environ.get("REPO_DIR", str(Path(__file__).resolve().parents[3])))
        venv_python = Path(os.environ.get("VENV_PYTHON", sys.executable))

        return cls(
            jira_domain=os.environ["JIRA_DOMAIN"],
            jira_email=os.environ["JIRA_EMAIL"],
            jira_api_token=os.environ["JIRA_API_TOKEN"],
            raw_dir=raw_dir,
            parquet_dir=parquet_dir,
            repo_dir=repo_dir,
            venv_python=venv_python,
        )


class JiraConsistencyChecker:
    """Checks data consistency across Jira API, JSON, and Parquet."""

    # Grace period for new issues (avoid false positives from timing windows)
    GRACE_PERIOD_MINUTES = 5

    # Thresholds for auto-backfill
    AUTO_FIX_THRESHOLD = 20  # Auto-fix if ≤20 issues missing
    WARNING_THRESHOLD = 5  # Log WARNING if >5 issues

    # Jira API limits
    MAX_RESULTS_PER_PAGE = 100

    def __init__(self, config: Config):
        self.config = config
        self.base_url = f"https://{config.jira_domain}/rest/api/3"
        self.auth = (config.jira_email, config.jira_api_token)

        # Statistics
        self.stats = {
            "jira_api_count": 0,
            "raw_json_count": 0,
            "parquet_count": 0,
            "missing_in_json": [],
            "missing_in_parquet": [],
            "deleted_in_jira": 0,
            "auto_backfilled": [],
            "backfill_failed": [],
            "transform_failed": [],
        }

    def fetch_jira_keys(self, max_age_days: int = 30) -> set[str]:
        """
        Query Jira API for all issue keys via JQL search.

        Args:
            max_age_days: Only fetch issues created in last N days

        Returns:
            Set of issue keys from Jira API (ground truth)
        """
        # Calculate cutoff date with grace period
        cutoff = datetime.now(timezone.utc) - timedelta(days=max_age_days)
        grace_cutoff = datetime.now(timezone.utc) - timedelta(minutes=self.GRACE_PERIOD_MINUTES)

        # JQL: fetch issues created after cutoff, but not too recent (grace period)
        jira_project = os.environ.get("JIRA_PROJECT", "")
        project_clause = f'project = "{jira_project}" AND ' if jira_project else ""
        jql = (
            f"{project_clause}"
            f'created >= "{cutoff.strftime("%Y-%m-%d")}" '
            f'AND created <= "{grace_cutoff.strftime("%Y-%m-%d %H:%M")}"'
        )

        logger.info(f"Querying Jira API with JQL: {jql}")

        issue_keys = set()
        next_page_token = None

        while True:
            try:
                result = self._search_issues(jql, next_page_token)
                issues = result.get("issues", [])

                if not issues:
                    break

                for issue in issues:
                    issue_keys.add(issue["key"])

                # Check for next page
                next_page_token = result.get("nextPageToken")
                if not next_page_token:
                    break

                # Respect rate limits
                time.sleep(0.1)

            except Exception as e:
                logger.error(f"Error querying Jira API: {e}")
                raise

        self.stats["jira_api_count"] = len(issue_keys)
        logger.info(f"Found {len(issue_keys)} issues from Jira API")
        return issue_keys

    def _search_issues(self, jql: str, next_page_token: str | None = None) -> dict:
        """Execute JQL search with pagination."""
        url = f"{self.base_url}/search/jql"
        payload = {
            "jql": jql,
            "maxResults": self.MAX_RESULTS_PER_PAGE,
            "fields": ["key"],  # Only need keys
        }

        if next_page_token:
            payload["nextPageToken"] = next_page_token

        with httpx.Client(timeout=60) as client:
            response = client.post(
                url,
                auth=self.auth,
                json=payload,
                headers={"Content-Type": "application/json"},
            )

        if response.status_code != 200:
            raise RuntimeError(f"Jira search failed: {response.status_code} - {response.text[:200]}")

        return response.json()

    def scan_json_keys(self) -> set[str]:
        """
        List issue keys from raw JSON files.

        Excludes deleted issues (those with _deleted_at field).

        Returns:
            Set of issue keys from JSON files
        """
        issues_dir = self.config.raw_dir / "issues"
        if not issues_dir.exists():
            logger.warning(f"Issues directory not found: {issues_dir}")
            return set()

        issue_keys = set()

        for json_file in issues_dir.glob("*.json"):
            try:
                with open(json_file) as f:
                    data = json.load(f)

                # Skip deleted issues
                if data.get("_deleted_at"):
                    continue

                issue_key = data.get("key")
                if issue_key:
                    issue_keys.add(issue_key)
                else:
                    logger.warning(f"JSON file missing 'key' field: {json_file}")

            except Exception as e:
                logger.warning(f"Error reading {json_file}: {e}")

        self.stats["raw_json_count"] = len(issue_keys)
        logger.info(f"Found {len(issue_keys)} issues in raw JSON")
        return issue_keys

    def scan_parquet_keys(self, month: str | None = None) -> set[str]:
        """
        Query Parquet files for distinct issue keys using DuckDB.

        Args:
            month: Optional month filter (e.g., "2026-02")

        Returns:
            Set of issue keys from Parquet files
        """
        if not HAS_DUCKDB:
            logger.warning("DuckDB not available, skipping Parquet validation")
            return set()

        issues_dir = self.config.parquet_dir / "issues"
        if not issues_dir.exists():
            logger.warning(f"Parquet directory not found: {issues_dir}")
            return set()

        # Build pattern for reading Parquet files
        if month:
            pattern = str(issues_dir / f"{month}.parquet")
        else:
            pattern = str(issues_dir / "*.parquet")

        try:
            con = duckdb.connect()
            result = con.execute(f"""
                SELECT DISTINCT issue_key
                FROM read_parquet('{pattern}')
            """).fetchall()

            issue_keys = {row[0] for row in result}
            self.stats["parquet_count"] = len(issue_keys)
            logger.info(f"Found {len(issue_keys)} issues in Parquet files")
            return issue_keys

        except Exception as e:
            logger.error(f"Error querying Parquet files: {e}")
            return set()

    def detect_discrepancies(
        self,
        jira_keys: set[str],
        json_keys: set[str],
        parquet_keys: set[str],
    ) -> dict:
        """
        Compare three sources and identify gaps.

        Args:
            jira_keys: Issue keys from Jira API
            json_keys: Issue keys from JSON files
            parquet_keys: Issue keys from Parquet files

        Returns:
            Dict with discrepancy lists
        """
        missing_in_json = sorted(jira_keys - json_keys)
        missing_in_parquet = sorted(json_keys - parquet_keys)
        deleted_in_jira = len(json_keys - jira_keys)

        self.stats["missing_in_json"] = missing_in_json
        self.stats["missing_in_parquet"] = missing_in_parquet
        self.stats["deleted_in_jira"] = deleted_in_jira

        logger.info("Discrepancies detected:")
        logger.info(f"  Missing in JSON (webhook loss): {len(missing_in_json)}")
        logger.info(f"  Missing in Parquet (transform lag): {len(missing_in_parquet)}")
        logger.info(f"  Deleted in Jira (expected): {deleted_in_jira}")

        return {
            "missing_in_json": missing_in_json,
            "missing_in_parquet": missing_in_parquet,
            "deleted_in_jira": deleted_in_jira,
        }

    def backfill_issues(self, issue_keys: list[str]) -> tuple[list[str], list[str]]:
        """
        Backfill specific issues using jira_backfill.py script.

        Args:
            issue_keys: List of issue keys to backfill

        Returns:
            Tuple of (successful_keys, failed_keys)
        """
        if not issue_keys:
            return [], []

        logger.info(f"Backfilling {len(issue_keys)} issues: {', '.join(issue_keys)}")

        # Build command for targeted backfill (force re-download to fix corrupted files)
        cmd = [
            str(self.config.venv_python),
            str(self.config.repo_dir / "connectors" / "jira" / "scripts" / "backfill.py"),
            "--issue-keys",
            ",".join(issue_keys),
            "--no-skip-existing",  # Force re-download even if files exist
        ]

        try:
            result = subprocess.run(
                cmd,
                cwd=self.config.repo_dir,
                capture_output=True,
                text=True,
                timeout=600,  # 10 minutes timeout
            )

            if result.returncode == 0:
                logger.info(f"Backfill completed successfully for {len(issue_keys)} issues")
                return issue_keys, []
            else:
                logger.error(f"Backfill failed: {result.stderr}")
                return [], issue_keys

        except subprocess.TimeoutExpired:
            logger.error("Backfill timed out after 10 minutes")
            return [], issue_keys
        except Exception as e:
            logger.error(f"Error running backfill: {e}")
            return [], issue_keys

    def transform_issues(self, issue_keys: list[str]) -> tuple[list[str], list[str]]:
        """
        Trigger incremental Parquet transform for specific issues.

        Args:
            issue_keys: List of issue keys to transform

        Returns:
            Tuple of (successful_keys, failed_keys)
        """
        if not issue_keys:
            return [], []

        logger.info(f"Transforming {len(issue_keys)} issues to Parquet")

        successful = []
        failed = []

        for issue_key in issue_keys:
            try:
                # Use subprocess to call transform module (ensures correct Python path)
                cmd = [
                    str(self.config.venv_python),
                    "-m",
                    "connectors.jira.incremental_transform",
                    issue_key,
                    "--raw-dir",
                    str(self.config.raw_dir),
                    "--output-dir",
                    str(self.config.parquet_dir),
                ]

                result = subprocess.run(
                    cmd,
                    cwd=self.config.repo_dir,
                    capture_output=True,
                    text=True,
                    timeout=120,
                )

                if result.returncode == 0:
                    successful.append(issue_key)
                else:
                    logger.error(f"Transform failed for {issue_key}: {result.stderr}")
                    failed.append(issue_key)

            except subprocess.TimeoutExpired:
                logger.error(f"Transform timed out for {issue_key}")
                failed.append(issue_key)
            except Exception as e:
                logger.error(f"Transform error for {issue_key}: {e}")
                failed.append(issue_key)

        if successful:
            logger.info(f"Transformed {len(successful)} issues successfully")
        if failed:
            logger.warning(f"Transform failed for {len(failed)} issues: {', '.join(failed)}")

        return successful, failed

    def get_alert_level(self, missing_count: int) -> str:
        """Determine alert level based on missing count."""
        if missing_count == 0:
            return "INFO"
        elif missing_count <= self.WARNING_THRESHOLD:
            return "INFO"
        elif missing_count <= self.AUTO_FIX_THRESHOLD:
            return "WARNING"
        else:
            return "ERROR"

    def run_check(
        self,
        max_age_days: int = 30,
        auto_fix: bool = True,
        dry_run: bool = False,
    ) -> dict:
        """
        Run consistency check and optionally auto-fix discrepancies.

        Args:
            max_age_days: Check issues created in last N days
            auto_fix: Enable automatic backfill for small gaps
            dry_run: Only check, don't fix anything

        Returns:
            Statistics dict with results
        """
        start_time = time.time()
        logger.info("=" * 60)
        logger.info("Starting Jira consistency check")
        logger.info(f"Max age: {max_age_days} days")
        logger.info(f"Auto-fix: {auto_fix}")
        logger.info(f"Dry run: {dry_run}")
        logger.info("=" * 60)

        # Fetch data from all three sources
        try:
            jira_keys = self.fetch_jira_keys(max_age_days)
            json_keys = self.scan_json_keys()
            parquet_keys = self.scan_parquet_keys()
        except Exception as e:
            logger.error(f"Error fetching data: {e}")
            return {"status": "error", "error": str(e)}

        # Detect discrepancies
        discrepancies = self.detect_discrepancies(jira_keys, json_keys, parquet_keys)

        missing_in_json = discrepancies["missing_in_json"]
        missing_in_parquet = discrepancies["missing_in_parquet"]

        # Determine if auto-fix should run
        should_fix = (
            auto_fix and not dry_run and len(missing_in_json) > 0 and len(missing_in_json) <= self.AUTO_FIX_THRESHOLD
        )

        # Apply fixes if needed
        if should_fix:
            logger.info(f"Auto-fixing {len(missing_in_json)} missing issues")

            # Backfill missing JSON files
            backfilled, backfill_failed = self.backfill_issues(missing_in_json)
            self.stats["auto_backfilled"] = backfilled
            self.stats["backfill_failed"] = backfill_failed

            # Transform to Parquet (for issues that were backfilled successfully)
            if backfilled:
                transformed, transform_failed = self.transform_issues(backfilled)
                self.stats["transform_failed"] = transform_failed

        elif len(missing_in_json) > self.AUTO_FIX_THRESHOLD:
            logger.error(
                f"Found {len(missing_in_json)} missing issues - exceeds threshold "
                f"({self.AUTO_FIX_THRESHOLD}), manual review required"
            )

        # Fix Parquet transform lag (always safe to re-transform)
        if auto_fix and not dry_run and missing_in_parquet:
            logger.info(f"Transforming {len(missing_in_parquet)} issues with Parquet lag")
            transformed, transform_failed = self.transform_issues(missing_in_parquet)
            self.stats["transform_failed"].extend(transform_failed)

        # Calculate final stats
        duration = time.time() - start_time
        alert_level = self.get_alert_level(len(missing_in_json))

        status = "success" if len(self.stats["backfill_failed"]) == 0 else "partial_success"

        # Build report
        report = {
            "timestamp": datetime.now(timezone.utc).isoformat(),
            "check_type": "incremental" if max_age_days <= 90 else "deep",
            "max_age_days": max_age_days,
            "duration_seconds": round(duration, 2),
            "counts": {
                "jira_api": self.stats["jira_api_count"],
                "raw_json": self.stats["raw_json_count"],
                "parquet": self.stats["parquet_count"],
            },
            "discrepancies": {
                "missing_in_json": missing_in_json,
                "missing_in_parquet": missing_in_parquet,
                "deleted_in_jira": self.stats["deleted_in_jira"],
            },
            "actions": {
                "auto_backfilled": self.stats["auto_backfilled"],
                "backfill_failed": self.stats["backfill_failed"],
                "transform_failed": self.stats["transform_failed"],
            },
            "status": status,
            "alert_level": alert_level,
        }

        # Save report to file
        report_path = self.config.raw_dir / "_consistency_report.json"
        try:
            # Atomic write using temp file
            fd, temp_path = tempfile.mkstemp(
                dir=report_path.parent,
                prefix=".consistency_report_",
                suffix=".json.tmp",
            )
            os.fchmod(fd, 0o660)  # Restore group rw so deploy can access via ACL
            with os.fdopen(fd, "w") as f:
                json.dump(report, f, indent=2)
            os.replace(temp_path, report_path)
            logger.info(f"Report saved to {report_path}")
        except Exception as e:
            logger.error(f"Failed to save report: {e}")

        # Log summary
        logger.info("=" * 60)
        logger.info("Consistency check completed")
        logger.info(f"Status: {status}")
        logger.info(f"Alert level: {alert_level}")
        logger.info(f"Duration: {duration:.1f}s")
        if missing_in_json:
            logger.info(f"Missing in JSON: {len(missing_in_json)} - {', '.join(missing_in_json[:10])}")
        if self.stats["auto_backfilled"]:
            logger.info(f"Auto-backfilled: {len(self.stats['auto_backfilled'])}")
        if self.stats["backfill_failed"]:
            logger.error(f"Backfill failed: {len(self.stats['backfill_failed'])}")
        logger.info("=" * 60)

        return report


def main():
    parser = argparse.ArgumentParser(
        description="Jira data consistency monitoring",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog=__doc__,
    )
    parser.add_argument(
        "--max-age-days",
        type=int,
        default=30,
        help="Check issues created in last N days (default: 30)",
    )
    parser.add_argument(
        "--auto-fix",
        action="store_true",
        default=True,
        help="Enable automatic backfill for small gaps (default: True)",
    )
    parser.add_argument(
        "--no-auto-fix",
        action="store_false",
        dest="auto_fix",
        help="Disable automatic backfill (only report discrepancies)",
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Only check, don't fix anything",
    )

    args = parser.parse_args()

    try:
        config = Config.from_env()
        checker = JiraConsistencyChecker(config)
        report = checker.run_check(
            max_age_days=args.max_age_days,
            auto_fix=args.auto_fix,
            dry_run=args.dry_run,
        )

        # Exit with error code if there are unfixed issues
        if report.get("alert_level") == "ERROR":
            sys.exit(1)
        elif report.get("status") != "success":
            sys.exit(1)

    except Exception as e:
        logger.error(f"Consistency check failed: {e}", exc_info=True)
        sys.exit(1)


if __name__ == "__main__":
    main()