"""
App Store — эндпоинты жизненного цикла приложений (M2: установка).

  POST   /api/appstore/apps/install            — установить приложение (app:install)
  GET    /api/appstore/apps                     — список установленных (app:view)
  GET    /api/appstore/apps/{id}                — детали (app:view)
  GET    /api/appstore/apps/{id}/operations     — журнал операций (app:view)
  GET    /api/appstore/apps/{id}/credentials    — секреты из формы, показать один раз (app:view)
  POST   /api/appstore/apps/{id}/retry          — повтор установки (app:manage)
  DELETE /api/appstore/apps/{id}                — удалить приложение вместе с LXC (app:manage)
"""

from __future__ import annotations

from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Request
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from ...auth import PermissionChecker
from ...db import get_db
from ...models import AppOperation, CatalogApp, InstalledApp, User
from ...services import appstore_engine as engine

router = APIRouter()


class InstallRequest(BaseModel):
    app_id: str
    name: str
    server_id: int
    form_answers: dict = {}
    # advanced (ТЗ 7.2, шаг 2)
    cores: int = Field(default=2, ge=1, le=512)
    memory: int = Field(default=2048, ge=64, le=4 * 1024 * 1024)   # МБ
    disk: int = Field(default=8, ge=1, le=65536)                  # ГБ
    # storage/bridge are spliced into Proxmox option strings (rootfs=, net0=):
    # a ',' would let the caller append options such as firewall=0.
    storage: str = Field(default="local-lvm", pattern=r"^[A-Za-z0-9][A-Za-z0-9_.-]{0,63}$")
    bridge: str = Field(default="vmbr0", pattern=r"^[A-Za-z0-9][A-Za-z0-9_.-]{0,63}$")
    node: Optional[str] = Field(default=None, pattern=r"^[A-Za-z0-9][A-Za-z0-9.-]{0,62}$")
    ostemplate: Optional[str] = None  # переопределение золотого шаблона
    # Кастомный рабочий порт приложения (переопределяет порт из каталога).
    # None — использовать порт по умолчанию из config.json приложения.
    port: Optional[int] = Field(default=None, ge=1, le=65535)
    # IPAM (опционально): если задан network — IP выделяется из пула IPAM,
    # иначе контейнер получает адрес по DHCP.
    ipam_network_id: Optional[int] = None
    ipam_pool_id: Optional[int] = None


def _can_admin(user: User) -> bool:
    return bool(getattr(user, "is_admin", False)) or user.has_permission("app:manage")


def _get_owned(db: Session, app_id: int, user: User) -> InstalledApp:
    ia = db.get(InstalledApp, app_id)
    if not ia:
        raise HTTPException(status_code=404, detail="Установленное приложение не найдено")
    if not _can_admin(user) and ia.owner_id != user.id:
        raise HTTPException(status_code=403, detail="Нет доступа к этому приложению")
    return ia


@router.post("/api/appstore/apps/install")
def install_app(
    req: InstallRequest,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:install")),
):
    from ..proxmox._helpers import get_visible_server_ids
    visible = get_visible_server_ids(request, db, current_user)
    if visible is not None and req.server_id not in visible:
        raise HTTPException(status_code=404, detail="Proxmox сервер не найден")
    try:
        result = engine.install(
            db, current_user,
            app_id=req.app_id, name=req.name, form_answers=req.form_answers,
            server_id=req.server_id, node=req.node, cores=req.cores,
            memory=req.memory, disk=req.disk, storage=req.storage,
            bridge=req.bridge, ostemplate=req.ostemplate, port=req.port,
            ipam_network_id=req.ipam_network_id, ipam_pool_id=req.ipam_pool_id,
        )
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    # secrets показываются один раз (в т.ч. сгенерированные random-поля)
    return {"success": True, **result}


@router.get("/api/appstore/apps")
def list_installed(
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:view")),
):
    q = db.query(InstalledApp)
    if not _can_admin(current_user):
        q = q.filter(InstalledApp.owner_id == current_user.id)
    rows = q.order_by(InstalledApp.created_at.desc()).all()
    return {"items": [a.to_dict() for a in rows]}


@router.get("/api/appstore/apps/{app_id}")
def get_installed(
    app_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:view")),
):
    ia = _get_owned(db, app_id, current_user)
    data = ia.to_dict()
    catalog = db.query(CatalogApp).filter(CatalogApp.app_id == ia.app_id).first()
    if catalog:
        data["catalog"] = catalog.to_dict(light=True)
        data["update_available"] = bool(
            catalog.tipi_version and ia.tipi_version_installed
            and catalog.tipi_version > ia.tipi_version_installed
        )
    return data


@router.get("/api/appstore/apps/{app_id}/operations")
def app_operations(
    app_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:view")),
):
    _get_owned(db, app_id, current_user)
    ops = (
        db.query(AppOperation)
        .filter(AppOperation.installed_app_id == app_id)
        .order_by(AppOperation.started_at.desc())
        .limit(20)
        .all()
    )
    return {"items": [o.to_dict() for o in ops]}


@router.get("/api/appstore/apps/{app_id}/credentials")
def app_credentials(
    app_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:view")),
):
    """Секреты из формы (password/random) — расшифрованные. Только владелец/админ.

    Дополнительно: учётные данные по умолчанию из манифеста источника
    (umbrel-app.yml → default_credentials) и сгенерированный APP_PASSWORD —
    для многих приложений это единственный способ узнать логин/пароль админа.
    """
    ia = _get_owned(db, app_id, current_user)
    env = ia.env_dict()
    catalog = db.query(CatalogApp).filter(CatalogApp.app_id == ia.app_id).first()
    secret_keys = set()
    for f in (catalog.form_fields if catalog else []) or []:
        if (f.get("type") or "").lower() in ("password", "random") and f.get("env_variable"):
            secret_keys.add(f["env_variable"])
    creds = {k: v for k, v in env.items() if k in secret_keys}

    dc = (catalog.default_credentials if catalog else None) or {}
    if dc.get("username"):
        creds.setdefault("USERNAME", dc["username"])
    default_pwd = env.get("APP_PASSWORD") if dc.get("deterministic") else dc.get("password")
    if default_pwd:
        creds.setdefault("PASSWORD", default_pwd)
    if env.get("APP_PASSWORD"):
        creds.setdefault("APP_PASSWORD", env["APP_PASSWORD"])
    return {"credentials": creds}


@router.post("/api/appstore/apps/{app_id}/retry")
def retry_install(
    app_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:manage")),
):
    _get_owned(db, app_id, current_user)
    try:
        result = engine.retry_install(db, current_user, app_id)
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"success": True, **result}


class UpdateRequest(BaseModel):
    form_answers: dict = {}


@router.post("/api/appstore/apps/{app_id}/update")
def update_app(
    app_id: int,
    req: UpdateRequest | None = None,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:manage")),
):
    _get_owned(db, app_id, current_user)
    try:
        result = engine.update(db, current_user, app_id, (req.form_answers if req else {}))
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"success": True, **result}


@router.post("/api/appstore/apps/{app_id}/rollback")
def rollback_app(
    app_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:manage")),
):
    _get_owned(db, app_id, current_user)
    try:
        result = engine.rollback(db, current_user, app_id)
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"success": True, **result}


@router.post("/api/appstore/apps/{app_id}/action/{action}")
def lifecycle(
    app_id: int,
    action: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:manage")),
):
    """action: start | stop | restart."""
    _get_owned(db, app_id, current_user)
    try:
        result = engine.lifecycle_action(db, current_user, app_id, action)
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"success": True, "app": result}


@router.get("/api/appstore/apps/{app_id}/logs")
def app_logs(
    app_id: int,
    tail: int = 200,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:view")),
):
    _get_owned(db, app_id, current_user)
    try:
        logs = engine.get_logs(db, app_id, tail)
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"logs": logs}


@router.post("/api/appstore/apps/reconcile")
def reconcile(
    db: Session = Depends(get_db),
    # Walks every installed app and polls Proxmox for each — not for viewers.
    _: User = Depends(PermissionChecker("app:manage")),
):
    return engine.reconcile(db)


@router.delete("/api/appstore/apps/{app_id}")
def delete_app(
    app_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(PermissionChecker("app:manage")),
):
    _get_owned(db, app_id, current_user)
    try:
        result = engine.delete_app(db, current_user, app_id)
    except engine.EngineError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"success": True, **result}