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from __future__ import annotations

import time
from typing import List, Optional, Union

from fastapi import APIRouter, HTTPException, Query

from app.models.schemas import (
    GoogleApiIdsResponse,
    GoogleApiScopesResponse,
    GoogleScopeNamesEntry,
    GoogleScopeNamesListResponse,
    GoogleScopeNamesResponse,
)
from app.services.google_scope_service import GoogleScopeError

from .deps import GENERATED, REFERENCE, SOURCE, get_scope_service

router = APIRouter()

_VALID_PERMISSION_LEVELS = frozenset({"non-sensitive", "sensitive", "restricted"})


def _filters_echo(
    api_name: Optional[str],
    oauth_only: bool,
    no_scope: bool,
    search: Optional[str],
    scope_name: Optional[str],
    permission_level: Optional[List[str]],
    required: Optional[bool],
    recommended: Optional[bool],
    scope_name_only: bool,
    ids_only: bool,
) -> dict:
    return {
        "api_name": api_name,
        "oauth_only": oauth_only,
        "no_scope": no_scope,
        "search": search,
        "scope_name": scope_name,
        "permission_level": permission_level,
        "required": required,
        "recommended": recommended,
        "scope_name_only": scope_name_only,
        "ids_only": ids_only,
    }


def _validate_permission_levels(permission_level: Optional[List[str]]) -> None:
    if permission_level:
        bad = [p for p in permission_level if p.strip().lower() not in _VALID_PERMISSION_LEVELS]
        if bad:
            raise HTTPException(
                status_code=422,
                detail=f"Invalid permission_level values: {', '.join(bad)}. "
                "Allowed: non-sensitive, sensitive, restricted.",
            )


@router.get("", response_model=Union[GoogleApiScopesResponse, GoogleScopeNamesResponse, GoogleScopeNamesListResponse, GoogleApiIdsResponse])
async def list_google_scopes(
    api_name: Optional[str] = Query(None, description="Filter to a single API id (e.g. gmail, youtube, drive)"),
    oauth_only: bool = Query(False, description="Only APIs that require OAuth scopes"),
    no_scope: bool = Query(False, description="Only APIs that do not require OAuth scopes"),
    search: Optional[str] = Query(None, description="Free-text search across API id/name and scope fields"),
    scope_name: Optional[str] = Query(None, description="Keep scopes whose name or URI contains this value"),
    permission_level: Optional[List[str]] = Query(None, description="Filter scopes by permission level (repeatable)"),
    required: Optional[bool] = Query(None, description="Filter scopes by required flag"),
    recommended: Optional[bool] = Query(None, description="Filter scopes by recommended flag"),
    scope_name_only: bool = Query(False, description="Return only scope names instead of full scope objects"),
    ids_only: bool = Query(False, description="Return only the matching API ids"),
    page: int = Query(1, ge=1, description="Page number"),
    page_size: int = Query(50, ge=1, le=200, description="Items per page"),
) -> Union[GoogleApiScopesResponse, GoogleScopeNamesResponse, GoogleScopeNamesListResponse, GoogleApiIdsResponse]:
    """List all Google integrations with their OAuth scopes and current selection.

    Supports combining every filter: ``api_name``, ``oauth_only``/``no_scope``,
    ``search``, ``scope_name``, ``permission_level``, ``required``,
    ``recommended``, ``scope_name_only``, ``ids_only`` and pagination.
    """
    _validate_permission_levels(permission_level)
    started = time.perf_counter()
    service = get_scope_service()
    try:
        plans = await service.load_all_plans()
        state = await service.load_state()
        data = service.build_data(plans, state)
    except GoogleScopeError as exc:
        return GoogleApiScopesResponse(
            success=False,
            time_ms=round((time.perf_counter() - started) * 1000, 3),
            error=exc.message,
        )

    filtered = service.filter_data(
        data,
        api_name=api_name,
        oauth_only=oauth_only,
        no_scope=no_scope,
        search=search,
        scope_name=scope_name,
        permission_level=permission_level,
        required=required,
        recommended=recommended,
        scope_name_only=scope_name_only,
    )

    if ids_only:
        return GoogleApiIdsResponse(
            success=True,
            time_ms=round((time.perf_counter() - started) * 1000, 3),
            count=len(filtered),
            ids=[e["id"] for e in filtered],
        )

    # Compact single-API shape for api_name + scope_name_only (see example).
    if scope_name_only and api_name:
        entry = next((e for e in filtered if e["id"] == api_name), None)
        if entry is None:
            raise HTTPException(status_code=404, detail=f"Unknown API id '{api_name}'")
        return GoogleScopeNamesResponse(api_name=entry["id"], scopes=entry["scopes"])

    if scope_name_only:
        start = (page - 1) * page_size
        chunk = filtered[start : start + page_size]
        return GoogleScopeNamesListResponse(
            success=True,
            time_ms=round((time.perf_counter() - started) * 1000, 3),
            count=len(chunk),
            data=[GoogleScopeNamesEntry(api_name=e["id"], scopes=e["scopes"]) for e in chunk],
        )

    total = len(filtered)
    total_pages = max(1, (total + page_size - 1) // page_size)
    start = (page - 1) * page_size
    chunk = filtered[start : start + page_size]
    return GoogleApiScopesResponse(
        success=True,
        time_ms=round((time.perf_counter() - started) * 1000, 3),
        count=len(chunk),
        total=total,
        page=page,
        page_size=page_size,
        total_pages=total_pages,
        generated=GENERATED,
        reference=REFERENCE,
        source=SOURCE,
        filters=_filters_echo(
            api_name=api_name,
            oauth_only=oauth_only,
            no_scope=no_scope,
            search=search,
            scope_name=scope_name,
            permission_level=permission_level,
            required=required,
            recommended=recommended,
            scope_name_only=scope_name_only,
            ids_only=ids_only,
        ),
        data=chunk,
    )