"""
OPC Task Management Router
"""
from fastapi import APIRouter, Depends, Query, HTTPException, Request
from typing import Optional, List
from pydantic import BaseModel
from datetime import datetime
from db import opc_db
from rbac import require_page, User
from routers import opc_ws

router = APIRouter()


class TaskCreate(BaseModel):
    title: str
    description: Optional[str] = None
    status: str = "parking_lot"
    priority: str = "medium"
    project_id: Optional[int] = None
    assigned_to: Optional[str] = None
    assigned_type: str = "human"
    tags: Optional[List[str]] = None
    due_date: Optional[datetime] = None


class TaskUpdate(BaseModel):
    title: Optional[str] = None
    description: Optional[str] = None
    status: Optional[str] = None
    priority: Optional[str] = None
    project_id: Optional[int] = None
    assigned_to: Optional[str] = None
    assigned_type: Optional[str] = None
    tags: Optional[List[str]] = None
    due_date: Optional[datetime] = None
    completed_at: Optional[datetime] = None


class TaskMove(BaseModel):
    status: str


class TaskAssign(BaseModel):
    assigned_to: str
    assigned_type: str = "human"


@router.get("/tasks")
async def list_tasks(
    request: Request,
    status: Optional[str] = Query(None),
    assigned_to: Optional[str] = Query(None),
    project_id: Optional[int] = Query(None),
    priority: Optional[str] = Query(None),
    tags: Optional[str] = Query(None),
    limit: int = Query(50, le=100),
    offset: int = Query(0, ge=0),
):
    """List tasks with filters"""
    user: User = request.state.user
    tag_list = tags.split(",") if tags else None
    tasks = await opc_db.get_tasks(
        status=status,
        assigned_to=assigned_to,
        project_id=project_id,
        priority=priority,
        tags=tag_list,
        limit=limit,
        offset=offset
    )
    return {"items": tasks, "total": len(tasks)}


@router.post("/tasks")
async def create_task(
    request: Request,
    task: TaskCreate,
):
    """Create a new task"""
    user: User = request.state.user
    # Strip timezone info from due_date if present (database uses TIMESTAMP not TIMESTAMPTZ)
    due_date = task.due_date.replace(tzinfo=None) if task.due_date else None
    created_task = await opc_db.create_task(
        title=task.title,
        description=task.description,
        status=task.status,
        priority=task.priority,
        project_id=task.project_id,
        assigned_to=task.assigned_to,
        assigned_type=task.assigned_type,
        tags=task.tags,
        due_date=due_date,
        actor=user.username
    )

    # Start automatic timer if status is in_progress
    if task.status == "in_progress":
        await opc_db.start_time_entry(
            task_id=created_task["id"],
            project_id=task.project_id,
            actor=user.username
        )

    # Broadcast WebSocket update
    await opc_ws.broadcast_task_update(created_task["id"], "created", created_task)

    return created_task


@router.get("/tasks/{task_id}")
async def get_task(
    task_id: int,
    request: Request,
):
    """Get task details"""
    user: User = request.state.user
    tasks = await opc_db.get_tasks(limit=1, offset=0)
    task = next((t for t in tasks if t["id"] == task_id), None)
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
    return task


@router.put("/tasks/{task_id}")
async def update_task(
    task_id: int,
    task: TaskUpdate,
    request: Request,
):
    """Update a task"""
    user: User = request.state.user
    updates = task.dict(exclude_unset=True)

    # Get current task status
    tasks = await opc_db.get_tasks(limit=1000, offset=0)
    current_task = next((t for t in tasks if t["id"] == task_id), None)
    if not current_task:
        raise HTTPException(status_code=404, detail="Task not found")

    # Handle automatic time tracking
    old_status = current_task["status"]
    new_status = updates.get("status", old_status)

    # Start timer when moving to in_progress
    if old_status != "in_progress" and new_status == "in_progress":
        await opc_db.start_time_entry(
            task_id=task_id,
            project_id=current_task.get("project_id"),
            actor=user.username
        )

    # Stop timer when moving away from in_progress
    if old_status == "in_progress" and new_status != "in_progress":
        await opc_db.stop_time_entry(task_id=task_id)

    # Set completed_at when moving to done
    if new_status == "done" and old_status != "done":
        updates["completed_at"] = datetime.utcnow()

    # Strip timezone info from datetime fields (database uses TIMESTAMP not TIMESTAMPTZ)
    if "due_date" in updates and updates["due_date"] is not None:
        updates["due_date"] = updates["due_date"].replace(tzinfo=None)
    if "completed_at" in updates and updates["completed_at"] is not None:
        updates["completed_at"] = updates["completed_at"].replace(tzinfo=None)

    updated_task = await opc_db.update_task(
        task_id=task_id,
        updates=updates,
        actor=user.username
    )

    # Broadcast WebSocket update
    await opc_ws.broadcast_task_update(task_id, "updated", updated_task)

    return updated_task


@router.delete("/tasks/{task_id}")
async def delete_task(
    task_id: int,
    request: Request,
):
    """Delete a task"""
    user: User = request.state.user
    await opc_db.delete_task(task_id=task_id, actor=user.username)

    # Broadcast WebSocket update
    await opc_ws.broadcast_task_update(task_id, "deleted", {"id": task_id})

    return {"ok": True}


@router.put("/tasks/{task_id}/move")
async def move_task(
    task_id: int,
    move: TaskMove,
    request: Request,
):
    """Move task to a different column"""
    print(f"[Move] move_task called: task_id={task_id}, new_status={move.status}")
    user: User = request.state.user
    updates = {"status": move.status}

    # Get current task
    tasks = await opc_db.get_tasks(limit=1000, offset=0)
    current_task = next((t for t in tasks if t["id"] == task_id), None)
    if not current_task:
        raise HTTPException(status_code=404, detail="Task not found")

    old_status = current_task["status"]
    print(f"[Move] Task {task_id}: old_status={old_status}, new_status={move.status}, assigned_to={current_task.get('assigned_to')}")

    # Handle automatic time tracking
    if old_status != "in_progress" and move.status == "in_progress":
        print(f"[Move] Task {task_id} moving to in_progress, old_status={old_status}")
        await opc_db.start_time_entry(
            task_id=task_id,
            project_id=current_task.get("project_id"),
            actor=user.username
        )

        # Auto-assign to default agent (PM) if not already assigned
        if not current_task.get("assigned_to"):
            print(f"[Move] Task {task_id} not assigned, auto-assigning to PM agent")
            updates["assigned_to"] = "pm"
            updates["assigned_type"] = "agent"

        # If assigned to an agent, ensure there's a pending execution
        if current_task.get("assigned_type") == "agent" or updates.get("assigned_type") == "agent":
            agent_id = updates.get("assigned_to") or current_task.get("assigned_to")
            print(f"[Move] Task {task_id} assigned to agent {agent_id}, checking for existing execution")

            # Check if there's already a pending execution
            existing_executions = await opc_db.get_agent_executions(
                task_id=task_id,
                status="pending",
                limit=1
            )

            if not existing_executions:
                print(f"[Move] No pending execution found, creating one for agent {agent_id}")
                execution_id = await opc_db.create_agent_execution(
                    task_id=task_id,
                    agent_id=agent_id,
                    actor=user.username
                )
                print(f"[Move] Created agent execution {execution_id} for task {task_id}")
            else:
                print(f"[Move] Pending execution already exists: {existing_executions[0]['id']}")

    if old_status == "in_progress" and move.status != "in_progress":
        await opc_db.stop_time_entry(task_id=task_id)

    if move.status == "done":
        updates["completed_at"] = datetime.utcnow().replace(tzinfo=None)

    updated_task = await opc_db.update_task(
        task_id=task_id,
        updates=updates,
        actor=user.username
    )
    return updated_task


@router.post("/tasks/{task_id}/assign")
async def assign_task(
    task_id: int,
    assign: TaskAssign,
    request: Request,
):
    """Assign task to human or agent"""
    user: User = request.state.user
    updates = {
        "assigned_to": assign.assigned_to,
        "assigned_type": assign.assigned_type
    }

    updated_task = await opc_db.update_task(
        task_id=task_id,
        updates=updates,
        actor=user.username
    )

    # If assigning to agent, create execution record
    if assign.assigned_type == "agent":
        await opc_db.create_agent_execution(
            task_id=task_id,
            agent_id=assign.assigned_to,
            actor=user.username
        )

    return updated_task


@router.get("/tasks/{task_id}/history")
async def get_task_history(
    task_id: int,
    request: Request,
):
    """Get task history"""
    user: User = request.state.user
    history = await opc_db.get_task_history(task_id=task_id)
    return {"items": history}


@router.get("/tasks/{task_id}/time")
async def get_task_time(
    task_id: int,
    request: Request,
):
    """Get time entries for a task"""
    user: User = request.state.user
    entries = await opc_db.get_time_entries(task_id=task_id)
    total_minutes = sum(e["duration_minutes"] for e in entries)
    return {
        "entries": entries,
        "total_minutes": total_minutes,
        "total_hours": round(total_minutes / 60, 2)
    }