import os
import secrets
import httpx
from pathlib import Path
from fastapi import FastAPI, Depends, HTTPException, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from sqlalchemy.orm import Session
from database import get_db
import crud, schemas
from models import APIKey as APIKeyModel, Usage as UsageModel

app = FastAPI(title="Ollama Proxy Admin API")

ALLOWED_ORIGINS = os.getenv("ALLOWED_ORIGINS", "http://localhost:5173").split(",")
ADMIN_PASSWORD = os.getenv("ADMIN_PASSWORD")
if not ADMIN_PASSWORD:
    raise RuntimeError("ADMIN_PASSWORD environment variable must be set")

app.add_middleware(
    CORSMiddleware,
    allow_origins=ALLOWED_ORIGINS,
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "PATCH", "DELETE"],
    allow_headers=["Authorization", "Content-Type"],
)

def require_admin_auth(request: Request):
    auth = request.headers.get("Authorization", "")
    token = auth.removeprefix("Bearer ").strip()
    if not secrets.compare_digest(token, ADMIN_PASSWORD):
        raise HTTPException(status_code=401, detail="Invalid admin password")

@app.get("/api/api-keys", response_model=list[schemas.APIKeyWithUsage])
async def read_api_keys(
    skip: int = 0, limit: int = 100,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    keys = db.query(APIKeyModel).offset(skip).limit(limit).all()
    result = []
    for key in keys:
        item = schemas.APIKeyWithUsage.model_validate(key)
        usage = db.query(UsageModel).filter(UsageModel.api_key_id == key.id).first()
        if usage:
            item.tokens_used_today = usage.tokens_used_today or 0
            item.tokens_used_month = usage.tokens_used_month or 0
            item.requests_today = usage.requests_today or 0
            item.requests_month = usage.requests_month or 0
        result.append(item)
    return result

@app.post("/api/api-keys", response_model=schemas.APIKeyCreated)
async def create_api_key(
    api_key: schemas.APIKeyCreate,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    db_key, raw_key = crud.create_api_key(
        db,
        name=api_key.name,
        expires_at=api_key.expires_at,
        daily_tokens=api_key.daily_tokens,
        monthly_tokens=api_key.monthly_tokens,
        daily_requests=api_key.daily_requests,
        monthly_requests=api_key.monthly_requests,
    )
    result = schemas.APIKeyCreated.model_validate(db_key)
    result.plaintext_key = raw_key
    return result

@app.patch("/api/api-keys/{api_key_id}/quota", response_model=schemas.APIKey)
async def update_quota(
    api_key_id: int,
    quota: schemas.QuotaUpdate,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    db_key = db.query(APIKeyModel).filter(APIKeyModel.id == api_key_id).first()
    if not db_key:
        raise HTTPException(status_code=404, detail="API key not found")
    for field, value in quota.model_dump(exclude_unset=True).items():
        setattr(db_key, field, value)
    db.commit()
    db.refresh(db_key)
    return db_key

@app.put("/api/api-keys/{api_key_id}/deactivate")
async def deactivate_api_key(
    api_key_id: int,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    db_key = db.query(APIKeyModel).filter(APIKeyModel.id == api_key_id).first()
    if not db_key:
        raise HTTPException(status_code=404, detail="API key not found")
    db_key.is_active = False
    db.commit()
    return {"message": "API key deactivated"}

@app.put("/api/api-keys/{api_key_id}/activate")
async def activate_api_key(
    api_key_id: int,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    db_key = db.query(APIKeyModel).filter(APIKeyModel.id == api_key_id).first()
    if not db_key:
        raise HTTPException(status_code=404, detail="API key not found")
    db_key.is_active = True
    db.commit()
    return {"message": "API key activated"}

@app.delete("/api/api-keys/{api_key_id}")
async def delete_api_key(
    api_key_id: int,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    db_key = db.query(APIKeyModel).filter(APIKeyModel.id == api_key_id).first()
    if not db_key:
        raise HTTPException(status_code=404, detail="API key not found")
    db.delete(db_key)
    db.commit()
    return {"message": "API key deleted"}

@app.get("/api/proxy-info")
async def get_proxy_info(_ = Depends(require_admin_auth)):
    host = os.getenv("PROXY_HOST", "0.0.0.0")
    port = os.getenv("PROXY_PORT", "8000")
    display_host = "localhost" if host in ("0.0.0.0", "::") else host
    return {"endpoint": f"http://{display_host}:{port}"}

@app.get("/api/settings", response_model=schemas.Settings)
async def read_settings(db: Session = Depends(get_db), _ = Depends(require_admin_auth)):
    return schemas.Settings(
        ollama_url=crud.get_setting(db, "ollama_url", "http://localhost:11434"),
        default_model=crud.get_setting(db, "default_model", "llama3"),
    )

@app.put("/api/settings", response_model=schemas.Settings)
async def update_settings(
    settings: schemas.Settings,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    ollama_url = settings.ollama_url.rstrip('/').removesuffix('/v1')
    crud.set_setting(db, "ollama_url", ollama_url)
    crud.set_setting(db, "default_model", settings.default_model)
    return schemas.Settings(ollama_url=ollama_url, default_model=settings.default_model)

@app.get("/api/ollama-models")
async def get_ollama_models(
    url: str = None,
    db: Session = Depends(get_db),
    _ = Depends(require_admin_auth),
):
    ollama_url = url or crud.get_setting(db, "ollama_url", "http://localhost:11434")
    try:
        async with httpx.AsyncClient(timeout=5.0) as client:
            response = await client.get(f"{ollama_url}/api/tags")
        models = [m["name"] for m in response.json().get("models", [])]
    except Exception:
        models = []
    return {"models": models}

# Statisches Frontend ausliefern (nur im Produktivbetrieb, wenn dist/ existiert)
_dist = Path(__file__).parent.parent / "frontend" / "dist"
if _dist.exists():
    app.mount("/", StaticFiles(directory=_dist, html=True), name="frontend")