from typing import Any
from urllib.parse import urlencode

from fastapi import APIRouter, Body, Depends, Header, HTTPException, Query, Response, status

from .config import Settings
from .credentials import get_request_settings
from .graph_client import MicrosoftGraphClient
from .schemas import (
    CalendarEventRequest,
    CalendarEventUpdateRequest,
    DriveUploadRequest,
    PlannerTaskCreateRequest,
    PlannerTaskUpdateRequest,
    ScheduleRequest,
    SendMailRequest,
)
from .services import CalendarService, DriveService, GroupsService, MailService, PlannerService, UsersService

router = APIRouter(tags=["microsoft365"])


def get_graph_client(request_settings: Settings = Depends(get_request_settings)) -> MicrosoftGraphClient:
    return MicrosoftGraphClient(request_settings)


def get_users_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> UsersService:
    return UsersService(graph)


def get_mail_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> MailService:
    return MailService(graph)


def get_calendar_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> CalendarService:
    return CalendarService(graph)


def get_drive_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> DriveService:
    return DriveService(graph)


def get_groups_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> GroupsService:
    return GroupsService(graph)


def get_planner_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> PlannerService:
    return PlannerService(graph)


@router.get("/status")
def microsoft365_status(request_settings: Settings = Depends(get_request_settings)) -> dict[str, Any]:
    return {
        "configured": request_settings.is_configured,
        "tenant_id": bool(request_settings.tenant_id),
        "client_id": bool(request_settings.client_id),
        "client_secret": bool(request_settings.client_secret),
        "graph_base_url": request_settings.graph_base_url,
    }


@router.get("/admin-consent/url")
def admin_consent_url(
    redirect_uri: str = Query(..., description="HTTPS callback URL registered on the Entra app registration."),
    state: str | None = Query(None, description="Opaque value returned to the callback, e.g. customer id."),
    request_settings: Settings = Depends(get_request_settings),
) -> dict[str, Any]:
    """Build the admin consent URL a client tenant administrator must open to approve the multitenant app."""
    if not request_settings.tenant_id or not request_settings.client_id:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="Tenant id and client id are required to build the admin consent URL.",
        )
    query: dict[str, str] = {
        "client_id": request_settings.client_id,
        "scope": request_settings.graph_scope,
        "redirect_uri": redirect_uri,
    }
    if state:
        query["state"] = state
    return {
        "tenant_id": request_settings.tenant_id,
        "url": f"https://login.microsoftonline.com/{request_settings.tenant_id}/v2.0/adminconsent?{urlencode(query)}",
    }


@router.get("/users")
async def list_users(
    top: int = Query(25, ge=1, le=999),
    search: str | None = None,
    service: UsersService = Depends(get_users_service),
) -> Any:
    return await service.list_users(top=top, search=search)


@router.get("/users/{user_id}")
async def get_user(user_id: str, service: UsersService = Depends(get_users_service)) -> Any:
    return await service.get_user(user_id)


@router.get("/users/{user_id}/mail/messages")
async def list_messages(
    user_id: str,
    folder: str = "Inbox",
    top: int = Query(25, ge=1, le=100),
    service: MailService = Depends(get_mail_service),
) -> Any:
    return await service.list_messages(user_id=user_id, folder=folder, top=top)


@router.post("/users/{user_id}/mail/send", status_code=status.HTTP_202_ACCEPTED)
async def send_mail(
    user_id: str,
    request: SendMailRequest,
    response: Response,
    service: MailService = Depends(get_mail_service),
) -> None:
    await service.send_mail(user_id=user_id, request=request)
    response.status_code = status.HTTP_202_ACCEPTED


@router.get("/users/{user_id}/calendar/events")
async def list_events(
    user_id: str,
    top: int = Query(25, ge=1, le=100),
    service: CalendarService = Depends(get_calendar_service),
) -> Any:
    return await service.list_events(user_id=user_id, top=top)


@router.post("/users/{user_id}/calendar/events", status_code=status.HTTP_201_CREATED)
async def create_event(
    user_id: str,
    request: CalendarEventRequest,
    service: CalendarService = Depends(get_calendar_service),
) -> Any:
    return await service.create_event(user_id=user_id, request=request)


@router.get("/users/{user_id}/calendar/view")
async def list_calendar_view(
    user_id: str,
    start: str = Query(..., description="ISO 8601 with offset, e.g. 2026-09-08T08:00:00+02:00."),
    end: str = Query(..., description="ISO 8601 with offset, e.g. 2026-09-08T18:00:00+02:00."),
    top: int = Query(25, ge=1, le=100),
    time_zone: str | None = Query(None, description="Time zone for returned dates, e.g. Europe/Prague."),
    service: CalendarService = Depends(get_calendar_service),
) -> Any:
    return await service.list_calendar_view(user_id=user_id, start=start, end=end, top=top, time_zone=time_zone)


@router.post("/users/{user_id}/calendar/schedule")
async def get_schedule(
    user_id: str,
    request: ScheduleRequest,
    service: CalendarService = Depends(get_calendar_service),
) -> Any:
    return await service.get_schedule(user_id=user_id, request=request)


@router.get("/users/{user_id}/calendar/events/{event_id}")
async def get_event(
    user_id: str,
    event_id: str,
    service: CalendarService = Depends(get_calendar_service),
) -> Any:
    return await service.get_event(user_id=user_id, event_id=event_id)


@router.patch("/users/{user_id}/calendar/events/{event_id}")
async def update_event(
    user_id: str,
    event_id: str,
    request: CalendarEventUpdateRequest,
    service: CalendarService = Depends(get_calendar_service),
) -> Any:
    return await service.update_event(user_id=user_id, event_id=event_id, request=request)


@router.delete("/users/{user_id}/calendar/events/{event_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_event(
    user_id: str,
    event_id: str,
    service: CalendarService = Depends(get_calendar_service),
) -> Response:
    await service.delete_event(user_id=user_id, event_id=event_id)
    return Response(status_code=status.HTTP_204_NO_CONTENT)


@router.get("/users/{user_id}/drive/root/children")
async def list_drive_root_children(
    user_id: str,
    top: int = Query(25, ge=1, le=200),
    service: DriveService = Depends(get_drive_service),
) -> Any:
    return await service.list_root_children(user_id=user_id, top=top)


@router.put("/users/{user_id}/drive/root/{path:path}")
async def upload_small_file(
    user_id: str,
    path: str,
    request: DriveUploadRequest = Body(...),
    service: DriveService = Depends(get_drive_service),
) -> Any:
    return await service.upload_small_file(user_id=user_id, path=path, request=request)


@router.get("/groups")
async def list_groups(
    top: int = Query(25, ge=1, le=999),
    service: GroupsService = Depends(get_groups_service),
) -> Any:
    return await service.list_groups(top=top)


@router.get("/teams/{team_id}/channels")
async def list_team_channels(team_id: str, service: GroupsService = Depends(get_groups_service)) -> Any:
    return await service.list_team_channels(team_id=team_id)


@router.get("/groups/{group_id}/planner/plans")
async def list_group_plans(group_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
    return await service.list_group_plans(group_id=group_id)


@router.get("/planner/plans/{plan_id}/buckets")
async def list_plan_buckets(plan_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
    return await service.list_plan_buckets(plan_id=plan_id)


@router.get("/planner/plans/{plan_id}/tasks")
async def list_plan_tasks(plan_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
    return await service.list_plan_tasks(plan_id=plan_id)


@router.post("/planner/tasks", status_code=status.HTTP_201_CREATED)
async def create_planner_task(
    request: PlannerTaskCreateRequest,
    service: PlannerService = Depends(get_planner_service),
) -> Any:
    return await service.create_task(request=request)


@router.get("/planner/tasks/{task_id}")
async def get_planner_task(task_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
    return await service.get_task(task_id=task_id)


@router.patch("/planner/tasks/{task_id}")
async def update_planner_task(
    task_id: str,
    request: PlannerTaskUpdateRequest,
    if_match: str | None = Header(
        None,
        alias="If-Match",
        description="Task ETag (@odata.etag). When omitted, the service loads the current ETag first.",
    ),
    service: PlannerService = Depends(get_planner_service),
) -> Any:
    return await service.update_task(task_id=task_id, request=request, if_match=if_match)


@router.delete("/planner/tasks/{task_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_planner_task(
    task_id: str,
    if_match: str | None = Header(
        None,
        alias="If-Match",
        description="Task ETag (@odata.etag). When omitted, the service loads the current ETag first.",
    ),
    service: PlannerService = Depends(get_planner_service),
) -> Response:
    await service.delete_task(task_id=task_id, if_match=if_match)
    return Response(status_code=status.HTTP_204_NO_CONTENT)