"""System settings router.

Manages key-value system settings including API provider configuration.
Each user has their own private settings.
"""

from datetime import datetime

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from ..auth import get_current_user
from ..database import get_db
from ..models import SystemSetting, User
from ..schemas import SettingResponse, SettingUpdate

router = APIRouter(
    prefix="/api/settings",
    tags=["settings"],
)


@router.get("/", response_model=list[SettingResponse])
def list_settings(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get all system settings for the current user."""
    settings = (
        db.query(SystemSetting)
        .filter(SystemSetting.user_id == current_user.id)
        .order_by(SystemSetting.key)
        .all()
    )
    return settings


@router.get("/providers/status")
def get_providers_status(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Check which API providers are configured (have API keys set)."""
    def _has_setting(key: str) -> str | None:
        # User-specific first
        setting = (
            db.query(SystemSetting)
            .filter(SystemSetting.key == key, SystemSetting.user_id == current_user.id)
            .first()
        )
        if not setting:
            # Global fallback
            setting = db.query(SystemSetting).filter(
                SystemSetting.key == key, SystemSetting.user_id == None
            ).first()
        if setting and setting.value:
            return setting.value if isinstance(setting.value, str) else str(setting.value)
        return None

    llm_provider = _has_setting("llm_provider")
    llm_key = _has_setting("llm_api_key")
    image_provider = _has_setting("image_provider")
    image_key = _has_setting("image_api_key")
    voice_provider = _has_setting("voice_provider")
    voice_key = _has_setting("voice_api_key")

    from ..models import SocialAccount
    social_platforms = {}
    for platform in ("facebook", "instagram", "youtube", "tiktok"):
        has_account = (
            db.query(SocialAccount)
            .filter(
                SocialAccount.platform == platform,
                SocialAccount.is_active == True,
                SocialAccount.access_token != None,
                SocialAccount.user_id == current_user.id,
            )
            .first()
        )
        social_platforms[platform] = has_account is not None

    return {
        "llm": {
            "configured": bool(llm_provider and llm_key),
            "provider": llm_provider,
        },
        "image": {
            "configured": bool(image_provider and image_key),
            "provider": image_provider,
        },
        "voice": {
            "configured": bool(voice_provider and voice_key),
            "provider": voice_provider,
        },
        "social": social_platforms,
    }


@router.get("/{key}", response_model=SettingResponse)
def get_setting(
    key: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get a single setting by key (user-specific)."""
    setting = (
        db.query(SystemSetting)
        .filter(SystemSetting.key == key, SystemSetting.user_id == current_user.id)
        .first()
    )
    if not setting:
        raise HTTPException(status_code=404, detail=f"Setting '{key}' not found")
    return setting


@router.put("/{key}", response_model=SettingResponse)
def upsert_setting(
    key: str,
    data: SettingUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Create or update a setting by key (user-specific)."""
    setting = (
        db.query(SystemSetting)
        .filter(SystemSetting.key == key, SystemSetting.user_id == current_user.id)
        .first()
    )
    if setting:
        setting.value = data.value
        setting.updated_at = datetime.utcnow()
    else:
        setting = SystemSetting(key=key, value=data.value, user_id=current_user.id)
        db.add(setting)
    db.commit()
    db.refresh(setting)
    return setting


@router.delete("/{key}", status_code=204)
def delete_setting(
    key: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Delete a setting by key (user-specific)."""
    setting = (
        db.query(SystemSetting)
        .filter(SystemSetting.key == key, SystemSetting.user_id == current_user.id)
        .first()
    )
    if not setting:
        raise HTTPException(status_code=404, detail=f"Setting '{key}' not found")
    db.delete(setting)
    db.commit()