"""쉘 스크립트 라이브러리 CRUD 엔드포인트."""
from datetime import datetime
from typing import List, Optional

from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy import select, or_
from sqlalchemy.ext.asyncio import AsyncSession

from core.auth import get_current_user
from database import get_db
from models import (
    ShellScript, ShellScriptCreate, ShellScriptOut, ShellScriptUpdate,
    User, UserRole,
)

router = APIRouter(prefix="/api/shell-scripts", tags=["shell-scripts"])


@router.get("", response_model=List[ShellScriptOut])
async def list_scripts(
    category: Optional[str] = Query(None),
    target_layer: Optional[str] = Query(None),
    os_type: Optional[str] = Query(None),
    keyword: Optional[str] = Query(None),
    inst_id: Optional[int] = Query(None),
    include_public: bool = Query(True),
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db),
    _u: User = Depends(get_current_user),
):
    q = select(ShellScript).where(ShellScript.is_active == True)

    # inst_id 필터: 해당 기관 전용 + 공용(NULL) 포함 가능
    if inst_id is not None:
        if include_public:
            q = q.where(or_(ShellScript.inst_id == inst_id, ShellScript.inst_id == None))
        else:
            q = q.where(ShellScript.inst_id == inst_id)

    if category:
        q = q.where(ShellScript.category == category)
    if target_layer:
        q = q.where(or_(ShellScript.target_layer == target_layer, ShellScript.target_layer == "ALL"))
    if os_type:
        q = q.where(or_(ShellScript.os_type == os_type, ShellScript.os_type == "ALL"))
    if keyword:
        q = q.where(
            or_(
                ShellScript.script_name.contains(keyword),
                ShellScript.description.contains(keyword),
                ShellScript.tags.contains(keyword),
            )
        )
    q = q.order_by(ShellScript.category, ShellScript.script_name).offset(skip).limit(limit)
    result = await db.execute(q)
    return result.scalars().all()


@router.get("/{script_id}", response_model=ShellScriptOut)
async def get_script(
    script_id: int,
    db: AsyncSession = Depends(get_db),
    _u: User = Depends(get_current_user),
):
    r = await db.execute(select(ShellScript).where(ShellScript.id == script_id))
    script = r.scalars().first()
    if not script:
        raise HTTPException(404, "스크립트를 찾을 수 없습니다.")
    return script


@router.post("", response_model=ShellScriptOut, status_code=201)
async def create_script(
    payload: ShellScriptCreate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    if current_user.role not in (UserRole.ADMIN, UserRole.PM, UserRole.ENGINEER):
        raise HTTPException(403, "권한이 없습니다.")
    data = payload.model_dump()
    data["author"] = data.get("author") or current_user.username
    script = ShellScript(**data)
    db.add(script)
    await db.commit()
    await db.refresh(script)
    return script


@router.patch("/{script_id}", response_model=ShellScriptOut)
async def update_script(
    script_id: int,
    payload: ShellScriptUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    if current_user.role not in (UserRole.ADMIN, UserRole.PM, UserRole.ENGINEER):
        raise HTTPException(403, "권한이 없습니다.")
    r = await db.execute(select(ShellScript).where(ShellScript.id == script_id))
    script = r.scalars().first()
    if not script:
        raise HTTPException(404, "스크립트를 찾을 수 없습니다.")
    for k, v in payload.model_dump(exclude_unset=True).items():
        setattr(script, k, v)
    script.updated_at = datetime.now()
    await db.commit()
    await db.refresh(script)
    return script


@router.delete("/{script_id}", status_code=204)
async def delete_script(
    script_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    if current_user.role not in (UserRole.ADMIN, UserRole.PM):
        raise HTTPException(403, "ADMIN 또는 PM 권한이 필요합니다.")
    r = await db.execute(select(ShellScript).where(ShellScript.id == script_id))
    script = r.scalars().first()
    if not script:
        raise HTTPException(404, "스크립트를 찾을 수 없습니다.")
    script.is_active = False
    script.updated_at = datetime.now()
    await db.commit()


@router.post("/{script_id}/increment-use", status_code=204)
async def increment_use_count(
    script_id: int,
    db: AsyncSession = Depends(get_db),
    _u: User = Depends(get_current_user),
):
    """스크립트 사용 횟수 증가 (타임테이블 연계 시 호출)."""
    r = await db.execute(select(ShellScript).where(ShellScript.id == script_id))
    script = r.scalars().first()
    if script:
        script.use_count = (script.use_count or 0) + 1
        await db.commit()