"""
작업 큐 시스템
에이전트 간 파일 접근 충돌을 방지하고 작업 순서를 자동으로 조율
"""
import json
from datetime import datetime, timedelta
from typing import Dict, List, Optional
from pathlib import Path
from dataclasses import dataclass, asdict
from enum import Enum
from fnmatch import fnmatch


class TaskStatus(Enum):
    """작업 상태"""
    PENDING = "pending"           # 대기 중
    QUEUED = "queued"             # 큐에 등록됨
    IN_PROGRESS = "in_progress"   # 진행 중
    COMPLETED = "completed"       # 완료
    FAILED = "failed"             # 실패
    PAUSED = "paused"             # 일시 중지


@dataclass
class QueuedTask:
    """큐에 등록된 작업"""
    task_id: str
    command: str
    agent: str
    status: TaskStatus
    required_files: List[str]
    locked_files: List[str]
    depends_on: Optional[str]
    created_at: str
    estimated_completion: Optional[str]
    progress: int = 0

    def to_dict(self) -> Dict:
        return {
            **asdict(self),
            'status': self.status.value
        }


class WorkQueueManager:
    """작업 큐 관리자"""

    def __init__(self, queue_dir: str = None, config_path: str = None):
        import os
        if queue_dir is None:
            queue_dir = os.getenv("WORK_QUEUE_DIR", "/tmp/work-queue")
        if config_path is None:
            config_path = os.getenv("WORK_QUEUE_CONFIG", "/tmp/work-queue/config.json")
        self.queue_dir = Path(queue_dir)
        self.config_path = Path(config_path)
        self.queue_dir.mkdir(parents=True, exist_ok=True)

        self.config = self._load_config()
        self.tasks: Dict[str, QueuedTask] = {}
        self._load_tasks()

    def _load_config(self) -> Dict:
        """설정 로드"""
        if self.config_path.exists():
            with open(self.config_path, 'r', encoding='utf-8') as f:
                return json.load(f)
        return {}

    def _load_tasks(self):
        """저장된 작업 로드"""
        # 여기서는 메모리에만 유지 (프로덕션에서는 DB 사용 권장)
        self.tasks = {}

    def enqueue_task(
        self,
        command: str,
        agent: str,
        required_files: List[str],
        depends_on: Optional[str] = None
    ) -> str:
        """작업을 큐에 추가"""
        task_id = f"task_{datetime.now().strftime('%Y%m%d_%H%M%S')}_{agent}"

        # 의존성 확인
        if depends_on:
            if depends_on not in self.tasks:
                raise ValueError(f"Task {depends_on} not found")
            if self.tasks[depends_on].status != TaskStatus.COMPLETED:
                status = TaskStatus.QUEUED
            else:
                status = TaskStatus.PENDING
        else:
            status = TaskStatus.PENDING

        # 파일 잠금 확인
        locked_files = self._check_file_conflicts(required_files, agent)

        task = QueuedTask(
            task_id=task_id,
            command=command,
            agent=agent,
            status=status,
            required_files=required_files,
            locked_files=locked_files,
            depends_on=depends_on,
            created_at=datetime.now().isoformat() + "Z",
            estimated_completion=None,
            progress=0
        )

        self.tasks[task_id] = task
        self._save_queue_status()

        return task_id

    def _check_file_conflicts(self, required_files: List[str], agent: str) -> List[str]:
        """파일 충돌 확인"""
        locked_files = []

        for file in required_files:
            # 현재 쓰기 권한을 가진 다른 에이전트 확인
            for task_id, task in self.tasks.items():
                if task.status == TaskStatus.IN_PROGRESS and task.agent != agent:
                    if self._files_conflict(file, task.required_files):
                        locked_files.append(file)
                        break

        return locked_files

    def _files_conflict(self, file1: str, files2: List[str]) -> bool:
        """두 파일 목록이 충돌하는지 확인"""
        for file2 in files2:
            if fnmatch(file1, file2) or fnmatch(file2, file1):
                return True

        return False

    def start_task(self, task_id: str) -> bool:
        """작업 시작"""
        if task_id not in self.tasks:
            return False

        task = self.tasks[task_id]

        # 의존성 확인
        if task.depends_on:
            if self.tasks[task.depends_on].status != TaskStatus.COMPLETED:
                return False

        # 파일 잠금 다시 확인
        if task.locked_files:
            return False

        task.status = TaskStatus.IN_PROGRESS
        task.estimated_completion = (
            datetime.now() + timedelta(minutes=30)
        ).isoformat() + "Z"

        self._save_queue_status()
        return True

    def complete_task(self, task_id: str, progress: int = 100) -> bool:
        """작업 완료"""
        if task_id not in self.tasks:
            return False

        task = self.tasks[task_id]
        task.status = TaskStatus.COMPLETED
        task.progress = 100

        # 다음 대기 중인 작업 시작 가능하도록 설정
        self._trigger_dependent_tasks(task_id)

        self._save_queue_status()
        return True

    def fail_task(self, task_id: str, reason: str) -> bool:
        """작업 실패 처리"""
        if task_id not in self.tasks:
            return False

        task = self.tasks[task_id]
        task.status = TaskStatus.FAILED

        self._save_queue_status()
        return True

    def pause_task(self, task_id: str, reason: str) -> bool:
        """작업 일시 중지"""
        if task_id not in self.tasks:
            return False

        task = self.tasks[task_id]
        task.status = TaskStatus.PAUSED

        self._save_queue_status()
        return True

    def update_progress(self, task_id: str, progress: int) -> bool:
        """작업 진행률 업데이트"""
        if task_id not in self.tasks:
            return False

        task = self.tasks[task_id]
        task.progress = min(100, max(0, progress))

        self._save_queue_status()
        return True

    def _trigger_dependent_tasks(self, completed_task_id: str):
        """완료된 작업에 의존하는 작업 트리거"""
        for task in self.tasks.values():
            if task.depends_on == completed_task_id and task.status == TaskStatus.QUEUED:
                task.status = TaskStatus.PENDING
                # 파일 잠금 다시 확인
                task.locked_files = self._check_file_conflicts(task.required_files, task.agent)

    def get_next_runnable_task(self) -> Optional[QueuedTask]:
        """실행 가능한 다음 작업 반환"""
        # 우선순위: 의존성 없는 작업 > 의존성 완료된 작업
        pending_tasks = [t for t in self.tasks.values() if t.status == TaskStatus.PENDING]

        if not pending_tasks:
            return None

        # 충돌 없는 작업 우선
        for task in pending_tasks:
            if not task.locked_files:
                return task

        return pending_tasks[0] if pending_tasks else None

    def get_queue_status(self) -> Dict:
        """현재 큐 상태 조회"""
        return {
            "total_tasks": len(self.tasks),
            "in_progress": len([t for t in self.tasks.values() if t.status == TaskStatus.IN_PROGRESS]),
            "queued": len([t for t in self.tasks.values() if t.status == TaskStatus.QUEUED]),
            "pending": len([t for t in self.tasks.values() if t.status == TaskStatus.PENDING]),
            "completed": len([t for t in self.tasks.values() if t.status == TaskStatus.COMPLETED]),
            "failed": len([t for t in self.tasks.values() if t.status == TaskStatus.FAILED]),
            "tasks": {task_id: task.to_dict() for task_id, task in self.tasks.items()}
        }

    def get_task(self, task_id: str) -> Optional[QueuedTask]:
        """작업 정보 조회"""
        return self.tasks.get(task_id)

    def list_tasks(self, status: Optional[TaskStatus] = None, agent: Optional[str] = None) -> List[QueuedTask]:
        """작업 목록 조회"""
        tasks = list(self.tasks.values())

        if status:
            tasks = [t for t in tasks if t.status == status]

        if agent:
            tasks = [t for t in tasks if t.agent == agent]

        return sorted(tasks, key=lambda t: t.created_at)

    def _save_queue_status(self):
        """큐 상태를 work-queue.md로 저장"""
        queue_file = self.queue_dir / "work-queue.md"

        # 상태별로 작업 분류
        in_progress_tasks = [t for t in self.tasks.values() if t.status == TaskStatus.IN_PROGRESS]
        queued_tasks = [t for t in self.tasks.values() if t.status == TaskStatus.QUEUED]
        pending_tasks = [t for t in self.tasks.values() if t.status == TaskStatus.PENDING]

        # Markdown 생성
        md_content = f"""# 📋 활성 작업 큐

**생성일**: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}
**마지막 업데이트**: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}

## 🔴 진행 중 (현재 잠금)

"""

        if in_progress_tasks:
            for idx, task in enumerate(in_progress_tasks, 1):
                md_content += f"""### [{idx}] {task.agent} - {task.command} (in_progress)
- **작업**: {task.command}
- **대상 파일**: {', '.join([f'`{f}`' for f in task.required_files])}
- **시작**: {task.created_at}
- **진행도**: {task.progress}%
- **잠금 상태**: {', '.join([f'✅ {f}' for f in task.required_files])}

---

"""
        else:
            md_content += "현재 진행 중인 작업 없음\n\n---\n\n"

        md_content += """## 🟠 대기 중 (예약됨)

"""

        if queued_tasks:
            for idx, task in enumerate(queued_tasks, 1):
                md_content += f"""### [{idx}] {task.agent} - {task.command} (queued)
- **작업**: {task.command}
- **대상 파일**: {', '.join([f'`{f}`' for f in task.required_files])}
- **선행 조건**: {task.depends_on or 'None'}
- **잠금 대기 파일**: {', '.join(task.locked_files) if task.locked_files else 'None'}

---

"""
        else:
            md_content += "대기 중인 작업 없음\n\n---\n\n"

        md_content += """## 🟡 준비 중

"""

        if pending_tasks:
            for idx, task in enumerate(pending_tasks, 1):
                md_content += f"""### [{idx}] {task.agent} - {task.command} (pending)
- **작업**: {task.command}
- **대상 파일**: {', '.join([f'`{f}`' for f in task.required_files])}
- **선행 조건**: {task.depends_on or 'None'}

---

"""
        else:
            md_content += "준비 중인 작업 없음\n\n"

        # 파일 저장
        with open(queue_file, 'w', encoding='utf-8') as f:
            f.write(md_content)

    def cleanup_old_tasks(self, days: int = 7) -> int:
        """오래된 작업 정리"""
        from datetime import timezone

        # timezone-aware cutoff_date 사용
        cutoff_date = datetime.now(timezone.utc) - timedelta(days=days)

        tasks_to_remove = []
        for task_id, task in self.tasks.items():
            created = datetime.fromisoformat(task.created_at.replace("Z", "+00:00"))
            if task.status in [TaskStatus.COMPLETED, TaskStatus.FAILED] and created < cutoff_date:
                tasks_to_remove.append(task_id)

        for task_id in tasks_to_remove:
            del self.tasks[task_id]

        if tasks_to_remove:
            self._save_queue_status()

        return len(tasks_to_remove)