"""Группы, членство, доступные фракции, список партий и статистика группы."""
from __future__ import annotations

from fastapi import APIRouter, Depends, Query, Request
from sqlmodel import Session

from app.auth.deps import get_current_user
from app.core.timeutil import iso_utc
from app.db.session import get_session
from app.models import User
from app.schemas import api as s
from app.services import (
    audit_service,
    group_service,
    invitation_service,
    membership_service,
    notification_service,
    notify,
    stats_service,
    user_service,
)

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


def _detail(session: Session, group_id: int, user_id: int) -> s.GroupDetail:
    group = group_service.get_group(session, group_id)
    member = group_service.assert_member(session, group_id, user_id)
    return s.GroupDetail(
        id=group.id,  # type: ignore[arg-type]
        name=group.name,
        owner_id=group.owner_id,
        my_role=member.role,
        expansion_ids=group_service.group_expansion_ids(session, group_id),
    )


@router.get("", response_model=list[s.GroupBrief])
def my_groups(
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> list[s.GroupBrief]:
    return [
        s.GroupBrief(id=g.id, name=g.name, role=role)
        for g, role in group_service.list_user_groups(session, user.id)  # type: ignore[arg-type]
    ]


@router.post("", response_model=s.GroupDetail)
def create_group(
    body: s.GroupCreate,
    request: Request,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.GroupDetail:
    group = group_service.create_group(session, user, body.name, body.expansion_ids)
    audit_service.record(
        session,
        actor_id=user.id,
        action="create",
        entity_type="group",
        entity_id=group.id,
        payload={"name": group.name},
        ip=request.client.host if request.client else None,
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    return _detail(session, group.id, user.id)  # type: ignore[arg-type]


@router.get("/{group_id}", response_model=s.GroupDetail)
def get_group(
    group_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.GroupDetail:
    return _detail(session, group_id, user.id)  # type: ignore[arg-type]


@router.patch("/{group_id}", response_model=s.GroupDetail)
def rename_group(
    group_id: int,
    body: s.GroupRename,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.GroupDetail:
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    group = group_service.get_group(session, group_id)
    group_service.rename_group(session, group, body.name)
    return _detail(session, group_id, user.id)  # type: ignore[arg-type]


@router.put("/{group_id}/expansions", response_model=s.GroupDetail)
def set_expansions(
    group_id: int,
    body: s.GroupExpansionsUpdate,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.GroupDetail:
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    group = group_service.get_group(session, group_id)
    group_service.set_expansions(session, group, body.expansion_ids)
    return _detail(session, group_id, user.id)  # type: ignore[arg-type]


@router.get("/{group_id}/factions", response_model=list[s.FactionRead])
def group_factions(
    group_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> list[s.FactionRead]:
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    return [
        s.FactionRead(
            id=f.id, code=f.code, name_ru=f.name_ru, expansion_id=f.expansion_id  # type: ignore[arg-type]
        )
        for f in group_service.available_factions(session, group_id)
    ]


# ─── Членство ────────────────────────────────────────────────────────────────

@router.get("/{group_id}/members", response_model=list[s.MemberRead])
def list_members(
    group_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> list[s.MemberRead]:
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    return [
        s.MemberRead(
            user_id=u.id,
            nickname=u.nickname,
            role=m.role,
            avatar_url=user_service.avatar_url_for(u.id, u.avatar_path, u.updated_at),
        )
        for m, u in membership_service.list_members(session, group_id)
    ]


@router.post("/{group_id}/invitations", response_model=s.InvitationRead)
def invite_member(
    group_id: int,
    body: s.MemberAdd,
    request: Request,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.InvitationRead:
    # Приглашать вправе ЛЮБОЙ участник группы (не только владелец) — assert_member.
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    group = group_service.get_group(session, group_id)
    inv, invited = invitation_service.create_invitation(session, group, user, body.nickname)
    audit_service.record(
        session,
        actor_id=user.id,
        action="create",
        entity_type="group_invitation",
        entity_id=group_id,
        payload={"invited_user_id": invited.id, "nickname": invited.nickname},
        ip=request.client.host if request.client else None,
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    notify.invitations_changed(invited.id)  # type: ignore[arg-type]  # живое появление у получателя
    notification_service.invited_to_group(
        session, invited.id, group.name, user.nickname  # type: ignore[arg-type]
    )
    return s.InvitationRead(
        id=inv.id,  # type: ignore[arg-type]
        group_id=group_id,
        group_name=group.name,
        invited_by_nickname=user.nickname,
        created_at=iso_utc(inv.created_at),
    )


@router.delete("/{group_id}/members/{user_id}", response_model=s.OkResponse)
def remove_member(
    group_id: int,
    user_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.OkResponse:
    # Любой участник управляет составом; защита создателя — в membership_service
    # (нельзя удалить последнего владельца).
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    group = group_service.get_group(session, group_id)
    membership_service.remove_member(session, group, user_id)
    notify.group_changed(session, group_id, extra_user_ids=[user_id])  # + удалённому
    return s.OkResponse()


@router.patch("/{group_id}/members/{user_id}", response_model=s.MemberRead)
def change_member_role(
    group_id: int,
    user_id: int,
    body: s.MemberRoleUpdate,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.MemberRead:
    group_service.assert_owner(session, group_id, user.id)  # type: ignore[arg-type]
    group = group_service.get_group(session, group_id)
    member = membership_service.change_role(session, group, user_id, body.role)
    u = user_service.get_user(session, user_id)
    return s.MemberRead(
        user_id=u.id,
        nickname=u.nickname,
        role=member.role,
        avatar_url=user_service.avatar_url_for(u.id, u.avatar_path, u.updated_at),
    )


# ─── Партии и статистика группы ──────────────────────────────────────────────

@router.get("/{group_id}/matches", response_model=s.MatchList)
def group_matches(
    group_id: int,
    limit: int = Query(20, ge=1, le=100),
    offset: int = Query(0, ge=0),
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> dict:
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    return stats_service.group_match_list(session, group_id, limit=limit, offset=offset)


@router.get("/{group_id}/stats", response_model=s.GroupStats)
def group_stats(
    group_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> dict:
    group_service.assert_member(session, group_id, user.id)  # type: ignore[arg-type]
    return stats_service.group_stats(session, group_id)