"""Provider CRUD routes."""
from datetime import date as date_cls
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from typing import Any
from core import data_manager
from core.scheduling_engine import normalize_time_str
from api.deps import get_current_session, require_admin_session

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


# --- Pydantic models ---

class WorkHours(BaseModel):
    start: str
    end: str


class ProviderCreate(BaseModel):
    name: str
    email: str = ""
    password: str = ""
    address: str = ""
    category: str = "provider"  # provider | nurse
    work_hours: WorkHours
    lunch_break: WorkHours
    service_levels: list[Any] = []


class ProviderUpdate(BaseModel):
    name: str | None = None
    email: str | None = None
    password: str | None = None
    address: str | None = None
    category: str | None = None
    work_hours: WorkHours | None = None
    lunch_break: WorkHours | None = None
    service_levels: list[Any] | None = None


class RecurringDaysOff(BaseModel):
    recurring_days_off: list[str]


class DaysOffEntry(BaseModel):
    date: str
    all_day: bool = True
    start_time: str | None = None
    end_time: str | None = None
    title: str = "Unavailable"


class OnCallEntry(BaseModel):
    date: str


def _normalize_hours(work_hours: WorkHours, lunch: WorkHours) -> tuple[dict, dict]:
    fields = {
        "Work Hours Start": work_hours.start,
        "Work Hours End": work_hours.end,
        "Lunch Start": lunch.start,
        "Lunch End": lunch.end,
    }
    out = {}
    for label, value in fields.items():
        n = normalize_time_str(value)
        if n is None:
            raise HTTPException(status_code=400, detail=f"{label} is not a valid time (HH:MM): {value!r}")
        out[label] = n
    return (
        {"start": out["Work Hours Start"], "end": out["Work Hours End"]},
        {"start": out["Lunch Start"], "end": out["Lunch End"]},
    )


@router.get("")
def list_providers(active_only: bool = False, session: dict = Depends(get_current_session)):
    return data_manager.get_all_providers(active_only=active_only)


@router.get("/{provider_id}")
def get_provider(provider_id: str, session: dict = Depends(get_current_session)):
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    # Provider users can only access their own record
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    return p


@router.post("")
def create_provider(req: ProviderCreate, session: dict = Depends(require_admin_session)):
    if not req.name:
        raise HTTPException(status_code=400, detail="Provider name is required")
    wh, lb = _normalize_hours(req.work_hours, req.lunch_break)
    provider_data = {
        "name": req.name,
        "email": req.email,
        "password": req.password,
        "address": req.address,
        "category": req.category,
        "work_hours": wh,
        "lunch_break": lb,
        "service_levels": req.service_levels,
    }
    new_prov = data_manager.add_provider(provider_data)
    data_manager.log_action(
        session["current_user"], "ADD_PROVIDER",
        f"Added provider: {req.name} ({new_prov['id']})",
    )
    return new_prov


@router.put("/{provider_id}")
def update_provider(provider_id: str, req: ProviderUpdate, session: dict = Depends(get_current_session)):
    # Providers may only edit themselves
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")

    existing = data_manager.get_provider_by_id(provider_id)
    if not existing:
        raise HTTPException(status_code=404, detail="Provider not found")

    updates: dict = {}
    if req.name is not None:
        updates["name"] = req.name
    if req.email is not None:
        updates["email"] = req.email
    if req.password is not None:
        updates["password"] = req.password
    if req.address is not None:
        updates["address"] = req.address
    if req.category is not None:
        updates["category"] = req.category
    if req.service_levels is not None:
        updates["service_levels"] = req.service_levels
    if req.work_hours is not None and req.lunch_break is not None:
        wh, lb = _normalize_hours(req.work_hours, req.lunch_break)
        updates["work_hours"] = wh
        updates["lunch_break"] = lb
    elif req.work_hours is not None:
        # normalize alone
        s = normalize_time_str(req.work_hours.start)
        e = normalize_time_str(req.work_hours.end)
        if not s or not e:
            raise HTTPException(status_code=400, detail="Invalid work hours")
        updates["work_hours"] = {"start": s, "end": e}
    elif req.lunch_break is not None:
        s = normalize_time_str(req.lunch_break.start)
        e = normalize_time_str(req.lunch_break.end)
        if not s or not e:
            raise HTTPException(status_code=400, detail="Invalid lunch break")
        updates["lunch_break"] = {"start": s, "end": e}

    updated = data_manager.update_provider(provider_id, updates)
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"Updated provider: {updated['name']} ({provider_id})",
    )
    return updated


@router.delete("/{provider_id}")
def delete_provider(provider_id: str, session: dict = Depends(require_admin_session)):
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    ok = data_manager.delete_provider(provider_id)
    if not ok:
        raise HTTPException(status_code=500, detail="Delete failed")
    data_manager.log_action(
        session["current_user"], "DELETE_PROVIDER",
        f"Deleted provider: {p['name']} ({provider_id})",
    )
    return {"ok": True}


# --- Recurring days off ---

@router.put("/{provider_id}/recurring-days-off")
def update_recurring_days_off(provider_id: str, req: RecurringDaysOff, session: dict = Depends(get_current_session)):
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    updated = data_manager.update_provider(provider_id, {"recurring_days_off": req.recurring_days_off})
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"Updated standing days off for {p['name']}: {', '.join(req.recurring_days_off) or 'None'}",
    )
    return updated


# --- Days off (unavailable blocks) ---

@router.post("/{provider_id}/days-off")
def add_days_off(provider_id: str, req: DaysOffEntry, session: dict = Depends(get_current_session)):
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")

    is_all_day = req.all_day
    new_entry = {
        "date": req.date,
        "all_day": is_all_day,
        "start_time": None if is_all_day else req.start_time,
        "end_time": None if is_all_day else req.end_time,
        "title": req.title or "Unavailable",
    }
    current = p.get("days_off", []) or []
    current.append(new_entry)
    updated = data_manager.update_provider(provider_id, {"days_off": current})
    detail = f"all day on {req.date}" if is_all_day else f"{req.start_time}–{req.end_time} on {req.date}"
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"Added unavailable block for {p['name']}: {req.title} ({detail})",
    )
    return updated


@router.delete("/{provider_id}/days-off/{index}")
def remove_days_off(provider_id: str, index: int, session: dict = Depends(get_current_session)):
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    current = p.get("days_off", []) or []
    if index < 0 or index >= len(current):
        raise HTTPException(status_code=400, detail="Invalid index")
    removed = current.pop(index)
    updated = data_manager.update_provider(provider_id, {"days_off": current})
    label = removed if isinstance(removed, str) else f"{removed.get('date')} {removed.get('title','')}"
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"Removed unavailable block from {p['name']}: {label}",
    )
    return updated


# --- On-Call ---

@router.post("/{provider_id}/on-call")
def add_on_call(provider_id: str, req: OnCallEntry, session: dict = Depends(get_current_session)):
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    current = sorted(p.get("on_call", []) or [])
    if req.date in current:
        return {"ok": True, "duplicate": True, "provider": p}
    current = sorted(current + [req.date])
    updated = data_manager.update_provider(provider_id, {"on_call": current})
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"Added on-call day for {p['name']}: {req.date}",
    )
    return updated


@router.delete("/{provider_id}/on-call/{date}")
def remove_on_call(provider_id: str, date: str, session: dict = Depends(get_current_session)):
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    current = [d for d in (p.get("on_call", []) or []) if d != date]
    updated = data_manager.update_provider(provider_id, {"on_call": current})
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"Removed on-call day for {p['name']}: {date}",
    )
    return updated


class OnCallToggle(BaseModel):
    date: str
    on_call: bool


@router.post("/{provider_id}/on-call/toggle")
def toggle_on_call(provider_id: str, req: OnCallToggle, session: dict = Depends(get_current_session)):
    """Toggle on-call status for a specific date. Convenience endpoint for the UI switch."""
    if session.get("user_role") == "provider" and session.get("provider_id") != provider_id:
        raise HTTPException(status_code=403, detail="Forbidden")
    p = data_manager.get_provider_by_id(provider_id)
    if not p:
        raise HTTPException(status_code=404, detail="Provider not found")
    current = set(p.get("on_call", []) or [])
    if req.on_call:
        current.add(req.date)
        action_word = "Enabled"
    else:
        current.discard(req.date)
        action_word = "Disabled"
    new_list = sorted(current)
    updated = data_manager.update_provider(provider_id, {"on_call": new_list})
    data_manager.log_action(
        session["current_user"], "UPDATE_PROVIDER",
        f"{action_word} on-call for {p['name']}: {req.date}",
    )
    return updated