#!/usr/bin/env python3
"""Safe Event Dispatcher for Workflow Integration

This module provides a secure wrapper for dispatching webhook events from
CI/CD workflows. It validates inputs, sanitizes data, and prevents common
security issues.

Usage:
    python safe_dispatch.py issue_comment owner/repo '{"action": "created", ...}'

Security Features:
- Input validation and sanitization
- Repository format validation
- Event data size limits
- No direct environment variable exposure
- Comprehensive error handling
"""

import json
import logging
import os
import sys
from typing import NoReturn

# Add parent directory to path
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from agents.chat_agent import ChatAgent
from agents.codebase_agent import CodebaseAgent
from agents.issue_agent import IssueAgent
from agents.pr_agent import PRAgent
from dispatcher import get_dispatcher
from utils.webhook_sanitizer import (
    extract_minimal_context,
    sanitize_webhook_data,
    validate_repository_format,
)

# Maximum event data size (10MB)
MAX_EVENT_SIZE = 10 * 1024 * 1024

logging.basicConfig(
    level=logging.INFO, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)


def setup_dispatcher():
    """Initialize dispatcher with all agents."""
    dispatcher = get_dispatcher()

    # Register all agents
    dispatcher.register_agent(PRAgent())
    dispatcher.register_agent(IssueAgent())
    dispatcher.register_agent(ChatAgent())
    dispatcher.register_agent(CodebaseAgent())

    return dispatcher


def load_event_data(event_json: str) -> dict:
    """Load and validate event data.

    Args:
        event_json: JSON string containing event data

    Returns:
        Parsed and validated event data

    Raises:
        ValueError: If data is invalid
    """
    # Check size before parsing
    if len(event_json) > MAX_EVENT_SIZE:
        raise ValueError(
            f"Event data too large: {len(event_json)} bytes (max: {MAX_EVENT_SIZE})"
        )

    try:
        data = json.loads(event_json)
    except json.JSONDecodeError as e:
        raise ValueError(f"Invalid JSON: {e}") from e

    if not isinstance(data, dict):
        raise ValueError("Event data must be a JSON object")

    return data


def safe_dispatch(event_type: str, repository: str, event_json: str) -> int:
    """Safely dispatch a webhook event.

    Args:
        event_type: Type of event (issue_comment, pull_request, etc.)
        repository: Repository in format "owner/repo"
        event_json: JSON string containing event data

    Returns:
        Exit code (0 for success, 1 for error)
    """
    try:
        # Validate repository format
        owner, repo = validate_repository_format(repository)
        logger.info(f"Dispatching {event_type} for {owner}/{repo}")

        # Load and validate event data
        event_data = load_event_data(event_json)

        # Sanitize event data to remove sensitive fields
        sanitized_data = sanitize_webhook_data(event_data)

        # Extract minimal context (reduces attack surface)
        minimal_data = extract_minimal_context(event_type, sanitized_data)

        # Log sanitized version
        logger.debug(f"Event data: {json.dumps(minimal_data, indent=2)[:500]}...")

        # Initialize dispatcher
        dispatcher = setup_dispatcher()

        # Dispatch event with sanitized data
        # Note: Agents will fetch full data from API if needed
        result = dispatcher.dispatch(
            event_type=event_type,
            event_data=minimal_data,
            owner=owner,
            repo=repo,
        )

        # Log results
        logger.info(f"Agents run: {result.agents_run}")
        for i, agent_result in enumerate(result.results):
            status = "✅" if agent_result.success else "❌"
            agent_name = result.agents_run[i]
            logger.info(f"  {status} {agent_name}: {agent_result.message}")

        # Return error code if any agents failed
        if result.errors:
            logger.error("Errors occurred during dispatch:")
            for error in result.errors:
                logger.error(f"  - {error}")
            return 1

        return 0

    except ValueError as e:
        logger.error(f"Validation error: {e}")
        return 1
    except Exception as e:
        logger.exception(f"Unexpected error during dispatch: {e}")
        return 1


def main() -> NoReturn:
    """Main entry point."""
    if len(sys.argv) != 4:
        print("Usage: safe_dispatch.py <event_type> <owner/repo> <event_json>")
        print()
        print("Example:")
        print(
            '  safe_dispatch.py issue_comment owner/repo \'{"action": "created", ...}\''
        )
        sys.exit(1)

    event_type = sys.argv[1]
    repository = sys.argv[2]
    event_json = sys.argv[3]

    exit_code = safe_dispatch(event_type, repository, event_json)
    sys.exit(exit_code)


if __name__ == "__main__":
    main()