"""Админ-роутер: отдельный вход (логин+пароль) и управление сущностями."""
from __future__ import annotations

from fastapi import APIRouter, Depends, File, Query, Request, Response, UploadFile
from fastapi.responses import FileResponse
from sqlmodel import Session

from app.auth.deps import get_current_admin
from app.core import security
from app.core.security import client_ip
from app.core.errors import NotFoundError
from app.core.timeutil import iso_utc
from app.db.session import get_session
from app.models import User
from app.routers.matches import attachment_read, build_match_read
from app.schemas import api as s
from app.services.match_service import ParticipantInput
from app.services import (
    achievement_service,
    admin_service,
    attachment_service,
    audit_service,
    faction_service,
    match_service,
    notify,
    user_service,
)

_ACHIEVEMENT_ICON_MAX_BYTES = 2 * 1024 * 1024  # 2 МБ

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


# ─── Аутентификация админа ───────────────────────────────────────────────────

@router.post("/auth/login", response_model=s.AdminMe)
def admin_login(
    body: s.AdminLogin,
    request: Request,
    response: Response,
    session: Session = Depends(get_session),
) -> s.AdminMe:
    admin = admin_service.authenticate_admin(session, body.username, body.password)
    security.set_admin_session(response, admin.id)  # type: ignore[arg-type]
    audit_service.record(
        session,
        actor_id=admin.id,
        action="login",
        entity_type="admin",
        entity_id=admin.id,
        ip=client_ip(request),
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    return s.AdminMe(id=admin.id, nickname=admin.nickname, role=admin.role)  # type: ignore[arg-type]


@router.post("/auth/logout", response_model=s.OkResponse)
def admin_logout(response: Response) -> s.OkResponse:
    security.clear_admin_session(response)
    return s.OkResponse()


@router.get("/me", response_model=s.AdminMe)
def admin_me(admin: User = Depends(get_current_admin)) -> s.AdminMe:
    return s.AdminMe(id=admin.id, nickname=admin.nickname, role=admin.role)  # type: ignore[arg-type]


# ─── Пользователи ────────────────────────────────────────────────────────────

@router.get("/users", response_model=list[s.AdminUserRead])
def list_users(
    query: str | None = Query(None),
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> list[s.AdminUserRead]:
    return [
        s.AdminUserRead(
            id=u.id,  # type: ignore[arg-type]
            nickname=u.nickname,
            role=u.role,
            is_active=u.is_active,
            auth_provider=u.auth_provider,
            telegram_id=u.telegram_id,
            created_at=iso_utc(u.created_at),
        )
        for u in admin_service.list_users(session, query)
    ]


@router.patch("/users/{user_id}", response_model=s.AdminUserRead)
def update_user(
    user_id: int,
    body: s.AdminUserUpdate,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.AdminUserRead:
    u = admin_service.update_user(session, user_id, nickname=body.nickname, is_active=body.is_active)
    audit_service.record(
        session,
        actor_id=admin.id,
        action="update",
        entity_type="user",
        entity_id=user_id,
        payload=body.model_dump(exclude_none=True),
        ip=client_ip(request),
    )
    session.commit()
    return s.AdminUserRead(
        id=u.id,  # type: ignore[arg-type]
        nickname=u.nickname,
        role=u.role,
        is_active=u.is_active,
        auth_provider=u.auth_provider,
        telegram_id=u.telegram_id,
        created_at=iso_utc(u.created_at),
    )


# Удаление аккаунта — намеренно НЕ здесь: это dev-only возможность, вынесена в
# routers/dev_admin.py (исключён из прод/тест-образа). В проде аккаунт только
# отключается (PATCH is_active), удалять нельзя.


# ─── Группы ──────────────────────────────────────────────────────────────────

@router.get("/groups", response_model=list[s.AdminGroupRead])
def list_groups(
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> list[s.AdminGroupRead]:
    return [
        s.AdminGroupRead(
            id=g.id, name=g.name, owner_id=g.owner_id, created_at=iso_utc(g.created_at)  # type: ignore[arg-type]
        )
        for g in admin_service.list_groups(session)
    ]


@router.delete("/groups/{group_id}", response_model=s.OkResponse)
def delete_group(
    group_id: int,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.OkResponse:
    admin_service.delete_group(session, group_id)
    audit_service.record(
        session, actor_id=admin.id, action="delete", entity_type="group", entity_id=group_id,
        ip=client_ip(request),
    )
    session.commit()
    return s.OkResponse()


# ─── Партии ──────────────────────────────────────────────────────────────────

@router.get("/matches", response_model=list[s.AdminMatchRead])
def list_matches(
    group_id: int | None = Query(None),
    user_id: int | None = Query(None),
    faction_id: int | None = Query(None),
    limit: int = Query(200, ge=1, le=500),
    offset: int = Query(0, ge=0),
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> list[s.AdminMatchRead]:
    return [
        s.AdminMatchRead(
            id=m.id,  # type: ignore[arg-type]
            group_id=m.group_id,
            group_name=gname,
            status=m.status,
            played_at=str(m.played_at),
            duration_minutes=m.duration_minutes,
            win_reason=m.win_reason,  # type: ignore[arg-type]
            player_count=m.player_count,
            created_by=m.created_by,
            created_at=iso_utc(m.created_at),
        )
        for m, gname in admin_service.list_matches(
            session,
            limit=limit,
            offset=offset,
            group_id=group_id,
            user_id=user_id,
            faction_id=faction_id,
        )
    ]


@router.get("/matches/{match_id}", response_model=s.MatchRead)
def get_match(
    match_id: int,
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> s.MatchRead:
    match = match_service.get_match(session, match_id)
    return build_match_read(session, match, can_modify=True)


@router.patch("/matches/{match_id}", response_model=s.MatchRead)
def update_match(
    match_id: int,
    body: s.MatchUpdate,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.MatchRead:
    match = match_service.get_match(session, match_id)
    participants = None
    if body.participants is not None:
        participants = [
            ParticipantInput(
                user_id=p.user_id,
                faction_id=p.faction_id,
                place=p.place,
                eliminated=p.eliminated,
                was_random=p.was_random,
                comment=p.comment,
            )
            for p in body.participants
        ]
    match = match_service.update_match(
        session,
        match,
        played_at=body.played_at,
        overall_comment=body.overall_comment,
        overall_comment_set=("overall_comment" in body.model_fields_set),
        win_reason=body.win_reason,
        win_reason_set=("win_reason" in body.model_fields_set),
        participants=participants,
        expected_version=body.expected_version,
    )
    audit_service.record(
        session,
        actor_id=admin.id,
        action="update",
        entity_type="match",
        entity_id=match.id,
        ip=client_ip(request),
    )
    session.commit()
    notify.match_changed(session, match)
    return build_match_read(session, match, can_modify=True)


# ─── Фракции (переименование во всей системе) ─────────────────────────────────

@router.get("/factions", response_model=list[s.FactionRead])
def list_factions(
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> list[s.FactionRead]:
    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 faction_service.list_factions(session)
    ]


@router.patch("/factions/{faction_id}", response_model=s.FactionRead)
def rename_faction(
    faction_id: int,
    body: s.FactionRename,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.FactionRead:
    f = admin_service.rename_faction(session, faction_id, body.name_ru)
    audit_service.record(
        session,
        actor_id=admin.id,
        action="update",
        entity_type="faction",
        entity_id=faction_id,
        payload={"name_ru": f.name_ru},
        ip=client_ip(request),
    )
    session.commit()
    return s.FactionRead(
        id=f.id, code=f.code, name_ru=f.name_ru, expansion_id=f.expansion_id  # type: ignore[arg-type]
    )


@router.delete("/matches/{match_id}", response_model=s.OkResponse)
def delete_match(
    match_id: int,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.OkResponse:
    group_id = match_service.get_match(session, match_id).group_id  # для уведомления
    # До удаления: каскад унесёт участников вместе с партией.
    participant_ids = notify.match_participant_ids(session, match_id)
    admin_service.delete_match(session, match_id)
    audit_service.record(
        session, actor_id=admin.id, action="delete", entity_type="match", entity_id=match_id,
        ip=client_ip(request),
    )
    session.commit()
    notify.match_removed(session, match_id, group_id, participant_ids)
    return s.OkResponse()


# ─── Медиа партии (админ правит в любой момент) ───────────────────────────────

@router.get("/matches/{match_id}/attachments", response_model=list[s.AttachmentRead])
def admin_list_attachments(
    match_id: int,
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> list[s.AttachmentRead]:
    match_service.get_match(session, match_id)  # 404 если партии нет
    return [
        attachment_read(a, f"/api/admin/matches/{match_id}")
        for a in attachment_service.list_for_match(session, match_id)
    ]


@router.post("/matches/{match_id}/attachments", response_model=s.AttachmentRead)
def admin_add_attachment(
    match_id: int,
    file: UploadFile = File(...),
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.AttachmentRead:
    match = match_service.get_match(session, match_id)
    content, ext = user_service.read_capped_image(
        file, attachment_service.MAX_ATTACHMENT_BYTES, "Файл слишком большой (макс. 10 МБ)."
    )
    att = attachment_service.add_photo(
        session, match, admin, content, ext, user_service.avatar_media_type(ext)
    )
    notify.match_changed(session, match)
    return attachment_read(att, f"/api/admin/matches/{match_id}")


@router.delete("/matches/{match_id}/attachments/{attachment_id}", response_model=s.OkResponse)
def admin_delete_attachment(
    match_id: int,
    attachment_id: int,
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> s.OkResponse:
    match = match_service.get_match(session, match_id)
    attachment_service.delete(session, match, attachment_id)
    notify.match_changed(session, match)
    return s.OkResponse()


@router.get("/matches/{match_id}/attachments/{attachment_id}")
def admin_get_attachment(
    match_id: int,
    attachment_id: int,
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> FileResponse:
    match_service.get_match(session, match_id)
    att = attachment_service.get_for_match(session, match_id, attachment_id)
    path = attachment_service.file_path(att)
    if not path.exists():
        raise NotFoundError("Файл не найден.")
    return FileResponse(
        path, media_type=att.mime_type, headers={"Cache-Control": "private, max-age=3600"}
    )


# ─── Ачивки (определения; выдача игрокам — на будущее) ────────────────────────

@router.get("/achievements", response_model=list[s.AchievementRead])
def list_achievements(
    _admin: User = Depends(get_current_admin),
) -> list[dict]:
    return achievement_service.list_achievements()


@router.post("/achievements", response_model=s.AchievementRead)
def create_achievement(
    body: s.AchievementCreate,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> dict:
    ach = achievement_service.create(body.name, body.description, body.condition)
    audit_service.record(
        session, actor_id=admin.id, action="create", entity_type="achievement",
        payload={"slug": ach["slug"], "name": ach["name"]},
        ip=client_ip(request),
    )
    session.commit()
    return ach


@router.patch("/achievements/{slug}", response_model=s.AchievementRead)
def update_achievement(
    slug: str,
    body: s.AchievementUpdate,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> dict:
    ach = achievement_service.update(
        slug, name=body.name, description=body.description, condition=body.condition
    )
    audit_service.record(
        session, actor_id=admin.id, action="update", entity_type="achievement",
        payload={"slug": slug}, ip=client_ip(request),
    )
    session.commit()
    return ach


@router.put("/achievements/{slug}/icon", response_model=s.AchievementRead)
def upload_achievement_icon(
    slug: str,
    file: UploadFile = File(...),
    _admin: User = Depends(get_current_admin),
) -> dict:
    content, ext = user_service.read_capped_image(
        file, _ACHIEVEMENT_ICON_MAX_BYTES, "Файл слишком большой (макс. 2 МБ)."
    )
    return achievement_service.set_icon(slug, content, ext)


@router.delete("/achievements/{slug}", response_model=s.OkResponse)
def delete_achievement(
    slug: str,
    request: Request,
    session: Session = Depends(get_session),
    admin: User = Depends(get_current_admin),
) -> s.OkResponse:
    achievement_service.delete(slug)
    audit_service.record(
        session, actor_id=admin.id, action="delete", entity_type="achievement",
        payload={"slug": slug}, ip=client_ip(request),
    )
    session.commit()
    return s.OkResponse()


# ─── Журнал аудита ───────────────────────────────────────────────────────────

@router.get("/audit-logs", response_model=s.AuditLogList)
def audit_logs(
    action: str | None = Query(None),
    entity_type: str | None = Query(None),
    limit: int = Query(100, ge=1, le=500),
    offset: int = Query(0, ge=0),
    session: Session = Depends(get_session),
    _admin: User = Depends(get_current_admin),
) -> dict:
    return admin_service.list_audit_logs(
        session, action=action, entity_type=entity_type, limit=limit, offset=offset
    )