"""Роутер партий: рандом фракции, старт, завершение, детали, правка, удаление."""
from __future__ import annotations

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

from app.auth.deps import get_current_user
from app.core.errors import ConflictError, NoGroupError, NotFoundError, ValidationError
from app.core.timeutil import iso_utc
from app.db.session import get_session
from app.models import Match, MatchAttachment, User
from app.schemas import api as s
from app.services import (
    attachment_service,
    audit_service,
    group_service,
    match_service,
    notification_service,
    notify,
    user_service,
)
from app.services.match_service import FinishInput, ParticipantInput, RosterInput

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

_ATTACHMENT_MAX_BYTES = 10 * 1024 * 1024  # 10 МБ


def attachment_read(att: MatchAttachment, base: str) -> s.AttachmentRead:
    """AttachmentRead с URL под нужным префиксом (base = '/api/matches/{id}' или
    '/api/admin/matches/{id}'); cookie игрока/админа доходит до своего пути."""
    return s.AttachmentRead(
        id=att.id,  # type: ignore[arg-type]
        kind=att.kind,
        url=f"{base}/attachments/{att.id}",
        mime_type=att.mime_type,
        size_bytes=att.size_bytes,
        created_at=iso_utc(att.created_at),
    )


def _ensure_has_any_group(session: Session, user: User) -> None:
    if not group_service.list_user_groups(session, user.id):  # type: ignore[arg-type]
        raise NoGroupError()


def build_match_read(session: Session, match: Match, *, can_modify: bool = False) -> s.MatchRead:
    parts = [
        s.MatchParticipantRead(
            user_id=u.id,  # type: ignore[arg-type]
            nickname=u.nickname,
            faction_id=f.id,  # type: ignore[arg-type]
            faction_name=f.name_ru,
            place=p.place,
            was_random=p.was_random,
            comment=p.comment,
        )
        for p, u, f in match_service.participants_detail(session, match.id)  # type: ignore[arg-type]
    ]
    return s.MatchRead(
        id=match.id,  # type: ignore[arg-type]
        group_id=match.group_id,
        status=match.status,
        played_at=match.played_at,
        started_at=iso_utc(match.started_at),
        finished_at=iso_utc(match.finished_at),
        duration_minutes=match.duration_minutes,
        win_reason=match.win_reason,  # type: ignore[arg-type]
        player_count=match.player_count,
        overall_comment=match.overall_comment,
        created_by=match.created_by,
        can_modify=can_modify,
        version=match_service.match_version(match),
        participants=parts,
        attachments=[
            attachment_read(a, f"/api/matches/{match.id}")
            for a in attachment_service.list_for_match(session, match.id)  # type: ignore[arg-type]
        ],
    )


@router.post("/randomize-faction", response_model=s.RandomizeResponse)
def randomize_faction(
    body: s.RandomizeRequest,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.RandomizeResponse:
    _ensure_has_any_group(session, user)
    group_service.assert_member(session, body.group_id, user.id)  # type: ignore[arg-type]
    faction = match_service.randomize_faction(session, body.group_id, body.exclude_faction_ids)
    return s.RandomizeResponse(
        faction=s.FactionRead(
            id=faction.id, code=faction.code, name_ru=faction.name_ru, expansion_id=faction.expansion_id  # type: ignore[arg-type]
        )
    )


@router.post("", response_model=s.MatchRead)
def start_match(
    body: s.MatchCreate,
    request: Request,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.MatchRead:
    """Этап 1: старт партии (выбор игроков и фракций)."""
    _ensure_has_any_group(session, user)
    roster = [
        RosterInput(user_id=p.user_id, faction_id=p.faction_id, was_random=p.was_random)
        for p in body.participants
    ]
    match = match_service.create_match(session, user, group_id=body.group_id, roster=roster)
    audit_service.record(
        session,
        actor_id=user.id,
        action="create",
        entity_type="match",
        entity_id=match.id,
        payload={"group_id": match.group_id, "player_count": match.player_count, "status": "in_progress"},
        ip=request.client.host if request.client else None,
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    notify.match_changed(session, match)
    notification_service.match_started(session, match, user.id)  # type: ignore[arg-type]
    return build_match_read(session, match, can_modify=match_service.can_modify(session, match, user))


@router.post("/{match_id}/finish", response_model=s.MatchRead)
def finish_match(
    match_id: int,
    body: s.MatchFinish,
    request: Request,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.MatchRead:
    """Этап 2: завершение партии (места, причина победы, длительность)."""
    match = match_service.get_match(session, match_id)
    match_service.assert_can_modify(session, match, user)
    finish = [
        FinishInput(user_id=p.user_id, place=p.place, comment=p.comment, faction_id=p.faction_id)
        for p in body.participants
    ]
    match = match_service.finish_match(
        session,
        match,
        finish=finish,
        win_reason=body.win_reason,
        overall_comment=body.overall_comment,
        overall_comment_set=("overall_comment" in body.model_fields_set),
        expected_version=body.expected_version,
    )
    audit_service.record(
        session,
        actor_id=user.id,
        action="update",
        entity_type="match",
        entity_id=match.id,
        payload={"event": "finish", "win_reason": match.win_reason, "duration_minutes": match.duration_minutes},
        ip=request.client.host if request.client else None,
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    notify.match_changed(session, match)
    notification_service.match_finished(session, match, user.id)  # type: ignore[arg-type]
    return build_match_read(session, match, can_modify=match_service.can_modify(session, match, user))


@router.get("/{match_id}", response_model=s.MatchRead)
def get_match(
    match_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.MatchRead:
    match = match_service.get_match(session, match_id)
    group_service.assert_member(session, match.group_id, user.id)  # type: ignore[arg-type]
    return build_match_read(session, match, can_modify=match_service.can_modify(session, match, user))


@router.patch("/{match_id}", response_model=s.MatchRead)
def update_match(
    match_id: int,
    body: s.MatchUpdate,
    request: Request,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.MatchRead:
    match = match_service.get_match(session, match_id)
    match_service.assert_can_modify(session, match, user)
    participants = None
    if body.participants is not None:
        participants = [
            ParticipantInput(
                user_id=p.user_id,
                faction_id=p.faction_id,
                place=p.place,
                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=user.id,
        action="update",
        entity_type="match",
        entity_id=match.id,
        ip=request.client.host if request.client else None,
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    notify.match_changed(session, match)
    return build_match_read(session, match, can_modify=match_service.can_modify(session, match, user))


# ─── Медиа партии (фото) ──────────────────────────────────────────────────────

def _assert_can_attach(session: Session, match: Match, user: User) -> None:
    match_service.assert_can_modify(session, match, user)
    if match.status != "in_progress":
        raise ConflictError("Медиа можно прикреплять только до завершения партии.")


@router.post("/{match_id}/attachments", response_model=s.AttachmentRead)
def add_attachment(
    match_id: int,
    file: UploadFile = File(...),
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.AttachmentRead:
    match = match_service.get_match(session, match_id)
    _assert_can_attach(session, match, user)
    content = file.file.read(_ATTACHMENT_MAX_BYTES + 1)
    if len(content) > _ATTACHMENT_MAX_BYTES:
        raise ValidationError("Файл слишком большой (макс. 10 МБ).")
    ext = user_service.sniff_image_ext(content)
    if ext is None:
        raise ValidationError("Поддерживаются только изображения PNG, JPEG или WebP.")
    att = attachment_service.add_photo(
        session, match, user, content, ext, user_service.avatar_media_type(ext)
    )
    notify.match_changed(session, match)
    return attachment_read(att, f"/api/matches/{match_id}")


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


@router.get("/{match_id}/attachments/{attachment_id}")
def get_attachment(
    match_id: int,
    attachment_id: int,
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> FileResponse:
    match = match_service.get_match(session, match_id)
    group_service.assert_member(session, match.group_id, user.id)  # type: ignore[arg-type]
    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"}
    )


@router.delete("/{match_id}", response_model=s.OkResponse)
def delete_match(
    match_id: int,
    request: Request,
    expected_version: str | None = Query(None),
    session: Session = Depends(get_session),
    user: User = Depends(get_current_user),
) -> s.OkResponse:
    match = match_service.get_match(session, match_id)
    match_service.assert_can_modify(session, match, user)
    match_id_val = match.id
    group_id_val = match.group_id
    match_service.delete_match(session, match, expected_version=expected_version)
    audit_service.record(
        session,
        actor_id=user.id,
        action="delete",
        entity_type="match",
        entity_id=match_id_val,
        payload={"group_id": group_id_val},
        ip=request.client.host if request.client else None,
        user_agent=request.headers.get("user-agent"),
    )
    session.commit()
    notify.match_removed(session, match_id_val, group_id_val)  # type: ignore[arg-type]
    return s.OkResponse()