import uuid
from fastapi import APIRouter, Depends
from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.deps import get_cra_site_scope, get_current_user, get_db_session, require_study_member
from app.models.milestone import Milestone
from app.schemas.progress import StudyProgressRead
from app.schemas.visit import VisitLostItem
from app.crud import visit as visit_crud
from app.schemas.dashboard import CenterSummaryItem
from app.crud import overview as overview_crud

router = APIRouter()


@router.get("/progress", response_model=StudyProgressRead, dependencies=[Depends(require_study_member())])
async def get_progress(
    study_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> StudyProgressRead:
    milestone_total_stmt = select(func.count()).select_from(Milestone).where(Milestone.study_id == study_id)
    milestone_done_stmt = select(func.count()).select_from(Milestone).where(
        Milestone.study_id == study_id, Milestone.status == "DONE"
    )

    milestone_total = (await db.execute(milestone_total_stmt)).scalar_one()
    milestone_done = (await db.execute(milestone_done_stmt)).scalar_one()

    completion_rate = float(milestone_done / milestone_total) if milestone_total else 0.0

    return StudyProgressRead(
        milestones_total=milestone_total,
        milestones_done=milestone_done,
        completion_rate=completion_rate,
    )


@router.get("/lost-visits", response_model=list[VisitLostItem], dependencies=[Depends(require_study_member())])
async def list_lost_visits(
    study_id: uuid.UUID,
    limit: int = 20,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> list[VisitLostItem]:
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    site_ids = cra_scope[0] if cra_scope else None
    rows = await visit_crud.list_lost_visits(db, study_id, site_ids=site_ids, limit=limit)
    items: list[VisitLostItem] = []
    for visit, subject_no, site_id in rows:
        items.append(
            VisitLostItem(
                visit_id=visit.id,
                subject_id=visit.subject_id,
                subject_no=subject_no,
                site_id=site_id,
                visit_code=visit.visit_code,
                status=visit.status,
                updated_at=visit.updated_at,
            )
        )
    return items


@router.get("/center-summary", response_model=list[CenterSummaryItem], dependencies=[Depends(require_study_member())])
async def get_center_summary(
    study_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> list[CenterSummaryItem]:
    role_value = current_user.role.value if hasattr(current_user.role, "value") else current_user.role
    if role_value not in {"ADMIN", "PM", "CRA"}:
        return []
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    scope_ids = cra_scope[0] if cra_scope else None
    scope_id_strs = {str(cid) for cid in scope_ids} if scope_ids is not None else None
    overview = await overview_crud.get_project_overview(db, study_id)
    centers = overview.get("centers") or []

    stage_order = [
        ("institution_initiation_status", "机构立项"),
        ("ethics_status", "伦理审批"),
        ("contract_sign_status", "合同签署"),
        ("startup_status", "启动"),
        ("enrollment_status", "入组"),
        ("inspection_status", "末次稽查"),
        ("closeout_status", "关中心"),
    ]

    summary_list: list[CenterSummaryItem] = []
    for center in centers:
        center_id = center.get("center_id")
        if scope_id_strs is not None and center_id not in scope_id_strs:
            continue

        stage_label = "未开始"
        stage_status = "NOT_STARTED"
        for key, label in stage_order:
            status = (center.get(key) or "NOT_STARTED").upper()
            if status in ("IN_PROGRESS", "BLOCKED"):
                stage_label = label
                stage_status = status
                break
            if status == "COMPLETED":
                stage_label = label
                stage_status = status
                continue

        summary_list.append(
            CenterSummaryItem(
                id=center_id,
                name=center.get("center_name") or "",
                stage=stage_label,
                stage_status=stage_status,
                actual_enrolled=center.get("enrollment_actual") or 0,
                planned_enrolled=center.get("enrollment_target") or 0,
            )
        )

    return summary_list