"""User profile endpoint (credits balance + Telegram binding + passive profile)."""

from __future__ import annotations

import uuid

from fastapi import APIRouter, status
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession

from src.contract_check.api.deps import (
    AsyncSessionDep,
    CurrentUserDep,
    bind_telegram_to_user,
    get_credits,
    set_user_password,
)
from src.contract_check.api.schemas import (
    BindTelegramRequest,
    BindTelegramResponse,
    DocsOverview,
)
from src.contract_check.api.schemas import MeCreditsResponse as MeResponse
from src.contract_check.api.schemas import (
    OverviewResponse,
    PlanOverview,
    SetPasswordRequest,
    UserProfile,
    UserProfilePatch,
)
from src.contract_check.core.config import get_settings
from src.contract_check.core.db.repositories import (
    CreditsRepository,
    DocumentRepository,
    UserProfileRepository,
    UserRepository,
)
from src.contract_check.core.db.repositories.profiles import UserProfileRow

router = APIRouter(prefix="/api/v1/me", tags=["me"])


@router.get("", response_model=MeResponse)
async def me(
    session: AsyncSessionDep,
    user: CurrentUserDep,
) -> MeResponse:
    credits = await get_credits(session, user.user_id)
    return MeResponse(
        telegram_id=user.telegram_id if user.telegram_id else None,
        credits_left=credits,
    )


@router.get("/documents")
async def list_my_documents(
    session: AsyncSessionDep,
    user: CurrentUserDep,
    limit: int = 10,
) -> dict[str, object]:
    """Return the current user's recent documents for the bot /reports command."""
    if limit < 1:
        limit = 1
    if limit > 100:
        limit = 100

    documents = await DocumentRepository(session).list_for_user(user.user_id, limit=limit, offset=0)
    return {
        "documents": [
            {
                "document_id": str(doc.id),
                "filename": doc.filename,
                "status": doc.status,
                "stage": doc.stage,
                "created_at": doc.created_at.isoformat() if doc.created_at else None,
            }
            for doc in documents
        ]
    }


@router.get("/profile", response_model=UserProfile)
async def get_profile(
    session: AsyncSessionDep,
    user: CurrentUserDep,
) -> UserProfile:
    """Return the user's passive profile, materializing defaults on first read."""
    row = await UserProfileRepository(session).get(user.user_id)
    await session.commit()
    return _row_to_profile(row)


@router.patch("/profile", response_model=UserProfile)
async def patch_profile(
    session: AsyncSessionDep,
    user: CurrentUserDep,
    body: UserProfilePatch,
) -> UserProfile:
    """Partially update the profile; only provided fields change (empty = no-op)."""
    repo = UserProfileRepository(session)
    # Lazy get first so PATCH on a never-read profile also works.
    await repo.get(user.user_id)
    row = await repo.update(
        user.user_id,
        language=body.language,
        timezone=body.timezone,
        notif_prefs=body.notif_prefs.model_dump() if body.notif_prefs else None,
        dashboard_prefs=body.dashboard_prefs.model_dump() if body.dashboard_prefs else None,
    )
    await session.commit()
    return _row_to_profile(row)


def _row_to_profile(row: UserProfileRow) -> UserProfile:
    return UserProfile(
        language=row.language,
        timezone=row.timezone,
        notif_prefs=dict(row.notif_prefs),  # type: ignore[arg-type]
        dashboard_prefs=dict(row.dashboard_prefs),  # type: ignore[arg-type]
    )


@router.get("/overview", response_model=OverviewResponse)
async def get_overview(
    session: AsyncSessionDep,
    user: CurrentUserDep,
) -> OverviewResponse:
    """User dashboard: doc counts, credits, plan/quota state, billing hold."""
    counts = await DocumentRepository(session).status_counts_for_user(user.user_id)
    credits_left = await CreditsRepository(session).get_balance(user.user_id)
    billing_hold = await UserRepository(session).get_billing_hold(user.user_id)

    plan: PlanOverview | None = None
    if get_settings().plans_enabled:
        plan = await _build_plan_overview(session, user.user_id)

    await session.commit()
    return OverviewResponse(
        docs=DocsOverview(
            total=counts["queued"]
            + counts["extracting"]
            + counts["prescreening"]
            + counts["ocr"]
            + counts["analyzing"]
            + counts["done"]
            + counts["failed"]
            + counts["manual_review"],
            done=counts["done"],
            failed=counts["failed"],
            in_progress=counts["queued"]
            + counts["extracting"]
            + counts["prescreening"]
            + counts["ocr"]
            + counts["analyzing"]
            + counts["manual_review"],
        ),
        credits_left=credits_left,
        plan=plan,
        billing_hold=billing_hold,
    )


async def _build_plan_overview(
    session: AsyncSession,
    user_id: uuid.UUID,
) -> PlanOverview | None:
    result = await session.execute(
        text(
            "SELECT s.plan_code, p.name, p.monthly_quota, s.current_period_end, "
            "       s.current_period_start, s.id "
            "FROM subscriptions s "
            "JOIN plans p ON p.code = s.plan_code "
            "WHERE s.user_id = :u "
            "  AND s.status = 'active' "
            "  AND s.current_period_start <= now() "
            "  AND s.current_period_end > now() "
            "LIMIT 1"
        ),
        {"u": user_id},
    )
    row = result.first()
    if row is None:
        return None
    plan_code, name, monthly_quota, period_end, period_start, sub_id = row
    used_result = await session.execute(
        text(
            "SELECT count(*) FROM quota_usage "
            "WHERE subscription_id = :sub AND created_at >= :start AND created_at < :end"
        ),
        {"sub": sub_id, "start": period_start, "end": period_end},
    )
    quota_used = int(used_result.scalar())
    return PlanOverview(
        code=plan_code,
        name=name,
        monthly_quota=monthly_quota,
        quota_used=quota_used,
        period_end=period_end.isoformat(),
    )


@router.post("/telegram", response_model=BindTelegramResponse)
async def bind_telegram(
    session: AsyncSessionDep,
    user: CurrentUserDep,
    body: BindTelegramRequest,
) -> BindTelegramResponse:
    """Link a Telegram account to the current web/email user."""
    await bind_telegram_to_user(session, user.user_id, body.telegram_id)
    return BindTelegramResponse(ok=True, telegram_id=body.telegram_id)


@router.post("/password", status_code=status.HTTP_200_OK)
async def set_password(
    session: AsyncSessionDep,
    user: CurrentUserDep,
    body: SetPasswordRequest,
) -> dict[str, bool]:
    """Let a Telegram-only user set a web password to access the web UI."""
    await set_user_password(session, user.user_id, body.password)
    return {"ok": True}