from typing import List, Optional
from datetime import datetime
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import select, func
from sqlalchemy.ext.asyncio import AsyncSession

from app.db.session import get_db
from app.models.user import User
from app.models.datasource import DataSource
from app.models.task import CollectionTask
from app.models.collected_data import CollectedData
from app.core.security import get_current_user
from app.services.collectors.registry import collector_registry

router = APIRouter()

COLLECTOR_INFO = {
    "top500": {
        "id": 1,
        "name": "TOP500 Supercomputers",
        "module": "L1",
        "priority": "P0",
        "frequency_hours": 4,
    },
    "epoch_ai_gpu": {
        "id": 2,
        "name": "Epoch AI GPU Clusters",
        "module": "L1",
        "priority": "P0",
        "frequency_hours": 6,
    },
    "huggingface_models": {
        "id": 3,
        "name": "HuggingFace Models",
        "module": "L2",
        "priority": "P1",
        "frequency_hours": 12,
    },
    "huggingface_datasets": {
        "id": 4,
        "name": "HuggingFace Datasets",
        "module": "L2",
        "priority": "P1",
        "frequency_hours": 12,
    },
    "huggingface_spaces": {
        "id": 5,
        "name": "HuggingFace Spaces",
        "module": "L2",
        "priority": "P2",
        "frequency_hours": 24,
    },
    "peeringdb_ixp": {
        "id": 6,
        "name": "PeeringDB IXP",
        "module": "L2",
        "priority": "P1",
        "frequency_hours": 24,
    },
    "peeringdb_network": {
        "id": 7,
        "name": "PeeringDB Networks",
        "module": "L2",
        "priority": "P2",
        "frequency_hours": 48,
    },
    "peeringdb_facility": {
        "id": 8,
        "name": "PeeringDB Facilities",
        "module": "L2",
        "priority": "P2",
        "frequency_hours": 48,
    },
    "telegeography_cables": {
        "id": 9,
        "name": "Submarine Cables",
        "module": "L2",
        "priority": "P1",
        "frequency_hours": 168,
    },
    "telegeography_landing": {
        "id": 10,
        "name": "Cable Landing Points",
        "module": "L2",
        "priority": "P2",
        "frequency_hours": 168,
    },
    "telegeography_systems": {
        "id": 11,
        "name": "Cable Systems",
        "module": "L2",
        "priority": "P2",
        "frequency_hours": 168,
    },
    "arcgis_cables": {
        "id": 15,
        "name": "ArcGIS Submarine Cables",
        "module": "L2",
        "priority": "P1",
        "frequency_hours": 168,
    },
    "fao_landing_points": {
        "id": 16,
        "name": "FAO Landing Points",
        "module": "L2",
        "priority": "P1",
        "frequency_hours": 168,
    },
}

ID_TO_COLLECTOR = {info["id"]: name for name, info in COLLECTOR_INFO.items()}
COLLECTOR_TO_ID = {name: info["id"] for name, info in COLLECTOR_INFO.items()}


def get_collector_name(source_id: str) -> Optional[str]:
    try:
        numeric_id = int(source_id)
        if numeric_id in ID_TO_COLLECTOR:
            return ID_TO_COLLECTOR[numeric_id]
    except ValueError:
        pass
    if source_id in COLLECTOR_INFO:
        return source_id
    return None


@router.get("")
async def list_datasources(
    module: Optional[str] = None,
    is_active: Optional[bool] = None,
    priority: Optional[str] = None,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    query = select(DataSource)

    filters = []
    if module:
        filters.append(DataSource.module == module)
    if is_active is not None:
        filters.append(DataSource.is_active == is_active)
    if priority:
        filters.append(DataSource.priority == priority)

    if filters:
        query = query.where(*filters)

    result = await db.execute(query)
    datasources = result.scalars().all()

    collector_list = []
    for name, info in COLLECTOR_INFO.items():
        is_active_status = collector_registry.is_active(name)

        running_task_query = (
            select(CollectionTask)
            .where(CollectionTask.datasource_id == info["id"])
            .where(CollectionTask.status == "running")
            .order_by(CollectionTask.started_at.desc())
            .limit(1)
        )
        running_result = await db.execute(running_task_query)
        running_task = running_result.scalar_one_or_none()

        last_run_query = (
            select(CollectionTask)
            .where(CollectionTask.datasource_id == info["id"])
            .where(CollectionTask.completed_at.isnot(None))
            .order_by(CollectionTask.completed_at.desc())
            .limit(1)
        )
        last_run_result = await db.execute(last_run_query)
        last_task = last_run_result.scalar_one_or_none()

        data_count_query = select(func.count(CollectedData.id)).where(CollectedData.source == name)
        data_count_result = await db.execute(data_count_query)
        data_count = data_count_result.scalar() or 0

        last_run = None
        if last_task and last_task.completed_at and data_count > 0:
            last_run = last_task.completed_at.strftime("%Y-%m-%d %H:%M")

        collector_list.append(
            {
                "id": info["id"],
                "name": info["name"],
                "module": info["module"],
                "priority": info["priority"],
                "frequency": f"{info['frequency_hours']}h",
                "is_active": is_active_status,
                "collector_class": name,
                "last_run": last_run,
                "is_running": running_task is not None,
                "task_id": running_task.id if running_task else None,
                "progress": running_task.progress if running_task else None,
                "records_processed": running_task.records_processed if running_task else None,
                "total_records": running_task.total_records if running_task else None,
            }
        )

    if module:
        collector_list = [c for c in collector_list if c["module"] == module]
    if priority:
        collector_list = [c for c in collector_list if c["priority"] == priority]

    return {
        "total": len(collector_list),
        "data": collector_list,
    }


@router.get("/{source_id}")
async def get_datasource(
    source_id: str,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")

    info = COLLECTOR_INFO[collector_name]
    return {
        "id": info["id"],
        "name": info["name"],
        "module": info["module"],
        "priority": info["priority"],
        "frequency": f"{info['frequency_hours']}h",
        "collector_class": collector_name,
        "is_active": collector_registry.is_active(collector_name),
    }


@router.post("/{source_id}/enable")
async def enable_datasource(
    source_id: str,
    current_user: User = Depends(get_current_user),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")
    collector_registry.set_active(collector_name, True)
    return {"status": "enabled", "source_id": source_id}


@router.post("/{source_id}/disable")
async def disable_datasource(
    source_id: str,
    current_user: User = Depends(get_current_user),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")
    collector_registry.set_active(collector_name, False)
    return {"status": "disabled", "source_id": source_id}


@router.get("/{source_id}/stats")
async def get_datasource_stats(
    source_id: str,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")

    info = COLLECTOR_INFO[collector_name]
    source_name = info["name"]

    query = select(func.count(CollectedData.id)).where(CollectedData.source == collector_name)
    result = await db.execute(query)
    total = result.scalar() or 0

    if total == 0:
        query = select(func.count(CollectedData.id)).where(CollectedData.source == source_name)
        result = await db.execute(query)
        total = result.scalar() or 0

    return {
        "source_id": source_id,
        "collector_name": collector_name,
        "name": info["name"],
        "total_records": total,
    }


@router.post("/{source_id}/trigger")
async def trigger_datasource(
    source_id: str,
    current_user: User = Depends(get_current_user),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")

    from app.services.scheduler import run_collector_now

    if not collector_registry.is_active(collector_name):
        raise HTTPException(status_code=400, detail="Data source is disabled")

    success = run_collector_now(collector_name)

    if success:
        return {
            "status": "triggered",
            "source_id": source_id,
            "collector_name": collector_name,
            "message": f"Collector '{collector_name}' has been triggered",
        }
    else:
        raise HTTPException(
            status_code=500,
            detail=f"Failed to trigger collector '{collector_name}'",
        )


@router.delete("/{source_id}/data")
async def clear_datasource_data(
    source_id: str,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")

    info = COLLECTOR_INFO[collector_name]
    source_name = info["name"]

    query = select(func.count(CollectedData.id)).where(CollectedData.source == collector_name)
    result = await db.execute(query)
    count = result.scalar() or 0

    if count == 0:
        query = select(func.count(CollectedData.id)).where(CollectedData.source == source_name)
        result = await db.execute(query)
        count = result.scalar() or 0
        delete_source = source_name
    else:
        delete_source = collector_name

    if count == 0:
        return {
            "status": "success",
            "message": "No data to clear",
            "deleted_count": 0,
        }

    delete_query = CollectedData.__table__.delete().where(CollectedData.source == delete_source)
    await db.execute(delete_query)
    await db.commit()

    return {
        "status": "success",
        "message": f"Cleared {count} records for data source '{info['name']}'",
        "deleted_count": count,
    }


@router.get("/{source_id}/task-status")
async def get_task_status(
    source_id: str,
    db: AsyncSession = Depends(get_db),
):
    collector_name = get_collector_name(source_id)
    if not collector_name:
        raise HTTPException(status_code=404, detail="Data source not found")

    info = COLLECTOR_INFO[collector_name]

    running_task_query = (
        select(CollectionTask)
        .where(CollectionTask.datasource_id == info["id"])
        .where(CollectionTask.status == "running")
        .order_by(CollectionTask.started_at.desc())
        .limit(1)
    )
    running_result = await db.execute(running_task_query)
    running_task = running_result.scalar_one_or_none()

    if not running_task:
        return {"is_running": False, "task_id": None, "progress": None}

    return {
        "is_running": True,
        "task_id": running_task.id,
        "progress": running_task.progress,
        "records_processed": running_task.records_processed,
        "total_records": running_task.total_records,
        "status": running_task.status,
    }