"""
FastAPI routes for Notfallplan (Emergency Plan) — Art. 33/34 DSGVO.

Endpoints:
  GET    /notfallplan/contacts           — List emergency contacts
  POST   /notfallplan/contacts           — Create contact
  PUT    /notfallplan/contacts/{id}      — Update contact
  DELETE /notfallplan/contacts/{id}      — Delete contact
  GET    /notfallplan/scenarios          — List scenarios
  POST   /notfallplan/scenarios          — Create scenario
  PUT    /notfallplan/scenarios/{id}     — Update scenario
  DELETE /notfallplan/scenarios/{id}     — Delete scenario
  GET    /notfallplan/checklists         — List checklists (filter by scenario_id)
  POST   /notfallplan/checklists         — Create checklist item
  PUT    /notfallplan/checklists/{id}    — Update checklist item
  DELETE /notfallplan/checklists/{id}    — Delete checklist item
  GET    /notfallplan/exercises          — List exercises
  POST   /notfallplan/exercises          — Create exercise
  GET    /notfallplan/stats              — Statistics overview
"""

import json
import logging
from datetime import datetime
from typing import Optional, List, Any

from fastapi import APIRouter, Depends, HTTPException, Query, Header
from pydantic import BaseModel
from sqlalchemy.orm import Session
from sqlalchemy import text

from classroom_engine.database import get_db

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/notfallplan", tags=["notfallplan"])


# ============================================================================
# Pydantic Schemas
# ============================================================================

class ContactCreate(BaseModel):
    name: str
    role: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    is_primary: bool = False
    available_24h: bool = False


class ContactUpdate(BaseModel):
    name: Optional[str] = None
    role: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    is_primary: Optional[bool] = None
    available_24h: Optional[bool] = None


class ScenarioCreate(BaseModel):
    title: str
    category: Optional[str] = None
    severity: str = 'medium'
    description: Optional[str] = None
    response_steps: List[Any] = []
    estimated_recovery_time: Optional[int] = None
    is_active: bool = True


class ScenarioUpdate(BaseModel):
    title: Optional[str] = None
    category: Optional[str] = None
    severity: Optional[str] = None
    description: Optional[str] = None
    response_steps: Optional[List[Any]] = None
    estimated_recovery_time: Optional[int] = None
    last_tested: Optional[str] = None
    is_active: Optional[bool] = None


class ChecklistCreate(BaseModel):
    title: str
    scenario_id: Optional[str] = None
    description: Optional[str] = None
    order_index: int = 0
    is_required: bool = True


class ChecklistUpdate(BaseModel):
    title: Optional[str] = None
    description: Optional[str] = None
    order_index: Optional[int] = None
    is_required: Optional[bool] = None


class ExerciseCreate(BaseModel):
    title: str
    scenario_id: Optional[str] = None
    exercise_type: str = 'tabletop'
    exercise_date: Optional[str] = None
    participants: List[Any] = []
    outcome: Optional[str] = None
    notes: Optional[str] = None


# ============================================================================
# Helpers
# ============================================================================

def _get_tenant(x_tenant_id: Optional[str] = Header(None, alias='X-Tenant-ID')) -> str:
    return x_tenant_id or 'default'


# ============================================================================
# Contacts
# ============================================================================

@router.get("/contacts")
async def list_contacts(
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """List all emergency contacts for a tenant."""
    rows = db.execute(
        text("""
            SELECT id, tenant_id, name, role, email, phone, is_primary, available_24h, created_at
            FROM compliance_notfallplan_contacts
            WHERE tenant_id = :tenant_id
            ORDER BY is_primary DESC, name
        """),
        {"tenant_id": tenant_id},
    ).fetchall()

    return [
        {
            "id": str(r.id),
            "tenant_id": r.tenant_id,
            "name": r.name,
            "role": r.role,
            "email": r.email,
            "phone": r.phone,
            "is_primary": r.is_primary,
            "available_24h": r.available_24h,
            "created_at": r.created_at.isoformat() if r.created_at else None,
        }
        for r in rows
    ]


@router.post("/contacts", status_code=201)
async def create_contact(
    request: ContactCreate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Create a new emergency contact."""
    row = db.execute(
        text("""
            INSERT INTO compliance_notfallplan_contacts
                (tenant_id, name, role, email, phone, is_primary, available_24h)
            VALUES (:tenant_id, :name, :role, :email, :phone, :is_primary, :available_24h)
            RETURNING id, tenant_id, name, role, email, phone, is_primary, available_24h, created_at
        """),
        {
            "tenant_id": tenant_id,
            "name": request.name,
            "role": request.role,
            "email": request.email,
            "phone": request.phone,
            "is_primary": request.is_primary,
            "available_24h": request.available_24h,
        },
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "name": row.name,
        "role": row.role,
        "email": row.email,
        "phone": row.phone,
        "is_primary": row.is_primary,
        "available_24h": row.available_24h,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


@router.put("/contacts/{contact_id}")
async def update_contact(
    contact_id: str,
    request: ContactUpdate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Update an existing emergency contact."""
    existing = db.execute(
        text("SELECT id FROM compliance_notfallplan_contacts WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": contact_id, "tenant_id": tenant_id},
    ).fetchone()

    if not existing:
        raise HTTPException(status_code=404, detail=f"Contact {contact_id} not found")

    updates = request.dict(exclude_none=True)
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")

    set_clauses = ", ".join(f"{k} = :{k}" for k in updates)
    updates["id"] = contact_id
    updates["tenant_id"] = tenant_id

    row = db.execute(
        text(f"""
            UPDATE compliance_notfallplan_contacts
            SET {set_clauses}
            WHERE id = :id AND tenant_id = :tenant_id
            RETURNING id, tenant_id, name, role, email, phone, is_primary, available_24h, created_at
        """),
        updates,
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "name": row.name,
        "role": row.role,
        "email": row.email,
        "phone": row.phone,
        "is_primary": row.is_primary,
        "available_24h": row.available_24h,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


@router.delete("/contacts/{contact_id}")
async def delete_contact(
    contact_id: str,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Delete an emergency contact."""
    existing = db.execute(
        text("SELECT id FROM compliance_notfallplan_contacts WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": contact_id, "tenant_id": tenant_id},
    ).fetchone()

    if not existing:
        raise HTTPException(status_code=404, detail=f"Contact {contact_id} not found")

    db.execute(
        text("DELETE FROM compliance_notfallplan_contacts WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": contact_id, "tenant_id": tenant_id},
    )
    db.commit()

    return {"success": True, "message": f"Contact {contact_id} deleted"}


# ============================================================================
# Scenarios
# ============================================================================

@router.get("/scenarios")
async def list_scenarios(
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """List all scenarios for a tenant."""
    rows = db.execute(
        text("""
            SELECT id, tenant_id, title, category, severity, description,
                   response_steps, estimated_recovery_time, last_tested, is_active, created_at
            FROM compliance_notfallplan_scenarios
            WHERE tenant_id = :tenant_id
            ORDER BY created_at DESC
        """),
        {"tenant_id": tenant_id},
    ).fetchall()

    return [
        {
            "id": str(r.id),
            "tenant_id": r.tenant_id,
            "title": r.title,
            "category": r.category,
            "severity": r.severity,
            "description": r.description,
            "response_steps": r.response_steps if r.response_steps else [],
            "estimated_recovery_time": r.estimated_recovery_time,
            "last_tested": r.last_tested.isoformat() if r.last_tested else None,
            "is_active": r.is_active,
            "created_at": r.created_at.isoformat() if r.created_at else None,
        }
        for r in rows
    ]


@router.post("/scenarios", status_code=201)
async def create_scenario(
    request: ScenarioCreate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Create a new scenario."""
    row = db.execute(
        text("""
            INSERT INTO compliance_notfallplan_scenarios
                (tenant_id, title, category, severity, description, response_steps, estimated_recovery_time, is_active)
            VALUES (:tenant_id, :title, :category, :severity, :description, :response_steps, :estimated_recovery_time, :is_active)
            RETURNING id, tenant_id, title, category, severity, description, response_steps,
                      estimated_recovery_time, last_tested, is_active, created_at
        """),
        {
            "tenant_id": tenant_id,
            "title": request.title,
            "category": request.category,
            "severity": request.severity,
            "description": request.description,
            "response_steps": json.dumps(request.response_steps),
            "estimated_recovery_time": request.estimated_recovery_time,
            "is_active": request.is_active,
        },
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "title": row.title,
        "category": row.category,
        "severity": row.severity,
        "description": row.description,
        "response_steps": row.response_steps if row.response_steps else [],
        "estimated_recovery_time": row.estimated_recovery_time,
        "last_tested": row.last_tested.isoformat() if row.last_tested else None,
        "is_active": row.is_active,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


@router.put("/scenarios/{scenario_id}")
async def update_scenario(
    scenario_id: str,
    request: ScenarioUpdate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Update an existing scenario."""
    existing = db.execute(
        text("SELECT id FROM compliance_notfallplan_scenarios WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": scenario_id, "tenant_id": tenant_id},
    ).fetchone()

    if not existing:
        raise HTTPException(status_code=404, detail=f"Scenario {scenario_id} not found")

    updates = request.dict(exclude_none=True)
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")

    # Serialize response_steps to JSON if present
    if "response_steps" in updates:
        updates["response_steps"] = json.dumps(updates["response_steps"])

    set_clauses = ", ".join(f"{k} = :{k}" for k in updates)
    updates["id"] = scenario_id
    updates["tenant_id"] = tenant_id

    row = db.execute(
        text(f"""
            UPDATE compliance_notfallplan_scenarios
            SET {set_clauses}
            WHERE id = :id AND tenant_id = :tenant_id
            RETURNING id, tenant_id, title, category, severity, description, response_steps,
                      estimated_recovery_time, last_tested, is_active, created_at
        """),
        updates,
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "title": row.title,
        "category": row.category,
        "severity": row.severity,
        "description": row.description,
        "response_steps": row.response_steps if row.response_steps else [],
        "estimated_recovery_time": row.estimated_recovery_time,
        "last_tested": row.last_tested.isoformat() if row.last_tested else None,
        "is_active": row.is_active,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


@router.delete("/scenarios/{scenario_id}")
async def delete_scenario(
    scenario_id: str,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Delete a scenario."""
    existing = db.execute(
        text("SELECT id FROM compliance_notfallplan_scenarios WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": scenario_id, "tenant_id": tenant_id},
    ).fetchone()

    if not existing:
        raise HTTPException(status_code=404, detail=f"Scenario {scenario_id} not found")

    db.execute(
        text("DELETE FROM compliance_notfallplan_scenarios WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": scenario_id, "tenant_id": tenant_id},
    )
    db.commit()

    return {"success": True, "message": f"Scenario {scenario_id} deleted"}


# ============================================================================
# Checklists
# ============================================================================

@router.get("/checklists")
async def list_checklists(
    scenario_id: Optional[str] = Query(None),
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """List checklist items, optionally filtered by scenario_id."""
    if scenario_id:
        rows = db.execute(
            text("""
                SELECT id, tenant_id, scenario_id, title, description, order_index, is_required, created_at
                FROM compliance_notfallplan_checklists
                WHERE tenant_id = :tenant_id AND scenario_id = :scenario_id
                ORDER BY order_index, created_at
            """),
            {"tenant_id": tenant_id, "scenario_id": scenario_id},
        ).fetchall()
    else:
        rows = db.execute(
            text("""
                SELECT id, tenant_id, scenario_id, title, description, order_index, is_required, created_at
                FROM compliance_notfallplan_checklists
                WHERE tenant_id = :tenant_id
                ORDER BY order_index, created_at
            """),
            {"tenant_id": tenant_id},
        ).fetchall()

    return [
        {
            "id": str(r.id),
            "tenant_id": r.tenant_id,
            "scenario_id": str(r.scenario_id) if r.scenario_id else None,
            "title": r.title,
            "description": r.description,
            "order_index": r.order_index,
            "is_required": r.is_required,
            "created_at": r.created_at.isoformat() if r.created_at else None,
        }
        for r in rows
    ]


@router.post("/checklists", status_code=201)
async def create_checklist(
    request: ChecklistCreate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Create a new checklist item."""
    row = db.execute(
        text("""
            INSERT INTO compliance_notfallplan_checklists
                (tenant_id, scenario_id, title, description, order_index, is_required)
            VALUES (:tenant_id, :scenario_id, :title, :description, :order_index, :is_required)
            RETURNING id, tenant_id, scenario_id, title, description, order_index, is_required, created_at
        """),
        {
            "tenant_id": tenant_id,
            "scenario_id": request.scenario_id,
            "title": request.title,
            "description": request.description,
            "order_index": request.order_index,
            "is_required": request.is_required,
        },
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "scenario_id": str(row.scenario_id) if row.scenario_id else None,
        "title": row.title,
        "description": row.description,
        "order_index": row.order_index,
        "is_required": row.is_required,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


@router.put("/checklists/{checklist_id}")
async def update_checklist(
    checklist_id: str,
    request: ChecklistUpdate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Update a checklist item."""
    existing = db.execute(
        text("SELECT id FROM compliance_notfallplan_checklists WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": checklist_id, "tenant_id": tenant_id},
    ).fetchone()

    if not existing:
        raise HTTPException(status_code=404, detail=f"Checklist item {checklist_id} not found")

    updates = request.dict(exclude_none=True)
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")

    set_clauses = ", ".join(f"{k} = :{k}" for k in updates)
    updates["id"] = checklist_id
    updates["tenant_id"] = tenant_id

    row = db.execute(
        text(f"""
            UPDATE compliance_notfallplan_checklists
            SET {set_clauses}
            WHERE id = :id AND tenant_id = :tenant_id
            RETURNING id, tenant_id, scenario_id, title, description, order_index, is_required, created_at
        """),
        updates,
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "scenario_id": str(row.scenario_id) if row.scenario_id else None,
        "title": row.title,
        "description": row.description,
        "order_index": row.order_index,
        "is_required": row.is_required,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


@router.delete("/checklists/{checklist_id}")
async def delete_checklist(
    checklist_id: str,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Delete a checklist item."""
    existing = db.execute(
        text("SELECT id FROM compliance_notfallplan_checklists WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": checklist_id, "tenant_id": tenant_id},
    ).fetchone()

    if not existing:
        raise HTTPException(status_code=404, detail=f"Checklist item {checklist_id} not found")

    db.execute(
        text("DELETE FROM compliance_notfallplan_checklists WHERE id = :id AND tenant_id = :tenant_id"),
        {"id": checklist_id, "tenant_id": tenant_id},
    )
    db.commit()

    return {"success": True, "message": f"Checklist item {checklist_id} deleted"}


# ============================================================================
# Exercises
# ============================================================================

@router.get("/exercises")
async def list_exercises(
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """List all exercises for a tenant."""
    rows = db.execute(
        text("""
            SELECT id, tenant_id, title, scenario_id, exercise_type, exercise_date,
                   participants, outcome, notes, created_at
            FROM compliance_notfallplan_exercises
            WHERE tenant_id = :tenant_id
            ORDER BY created_at DESC
        """),
        {"tenant_id": tenant_id},
    ).fetchall()

    return [
        {
            "id": str(r.id),
            "tenant_id": r.tenant_id,
            "title": r.title,
            "scenario_id": str(r.scenario_id) if r.scenario_id else None,
            "exercise_type": r.exercise_type,
            "exercise_date": r.exercise_date.isoformat() if r.exercise_date else None,
            "participants": r.participants if r.participants else [],
            "outcome": r.outcome,
            "notes": r.notes,
            "created_at": r.created_at.isoformat() if r.created_at else None,
        }
        for r in rows
    ]


@router.post("/exercises", status_code=201)
async def create_exercise(
    request: ExerciseCreate,
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Create a new exercise."""
    exercise_date = None
    if request.exercise_date:
        try:
            exercise_date = datetime.fromisoformat(request.exercise_date)
        except ValueError:
            pass

    row = db.execute(
        text("""
            INSERT INTO compliance_notfallplan_exercises
                (tenant_id, title, scenario_id, exercise_type, exercise_date, participants, outcome, notes)
            VALUES (:tenant_id, :title, :scenario_id, :exercise_type, :exercise_date, :participants, :outcome, :notes)
            RETURNING id, tenant_id, title, scenario_id, exercise_type, exercise_date,
                      participants, outcome, notes, created_at
        """),
        {
            "tenant_id": tenant_id,
            "title": request.title,
            "scenario_id": request.scenario_id,
            "exercise_type": request.exercise_type,
            "exercise_date": exercise_date,
            "participants": json.dumps(request.participants),
            "outcome": request.outcome,
            "notes": request.notes,
        },
    ).fetchone()
    db.commit()

    return {
        "id": str(row.id),
        "tenant_id": row.tenant_id,
        "title": row.title,
        "scenario_id": str(row.scenario_id) if row.scenario_id else None,
        "exercise_type": row.exercise_type,
        "exercise_date": row.exercise_date.isoformat() if row.exercise_date else None,
        "participants": row.participants if row.participants else [],
        "outcome": row.outcome,
        "notes": row.notes,
        "created_at": row.created_at.isoformat() if row.created_at else None,
    }


# ============================================================================
# Stats
# ============================================================================

@router.get("/stats")
async def get_stats(
    db: Session = Depends(get_db),
    tenant_id: str = Depends(_get_tenant),
):
    """Return statistics for the Notfallplan module."""
    contacts_count = db.execute(
        text("SELECT COUNT(*) FROM compliance_notfallplan_contacts WHERE tenant_id = :tenant_id"),
        {"tenant_id": tenant_id},
    ).scalar()

    scenarios_count = db.execute(
        text("SELECT COUNT(*) FROM compliance_notfallplan_scenarios WHERE tenant_id = :tenant_id AND is_active = TRUE"),
        {"tenant_id": tenant_id},
    ).scalar()

    exercises_count = db.execute(
        text("SELECT COUNT(*) FROM compliance_notfallplan_exercises WHERE tenant_id = :tenant_id"),
        {"tenant_id": tenant_id},
    ).scalar()

    checklists_count = db.execute(
        text("SELECT COUNT(*) FROM compliance_notfallplan_checklists WHERE tenant_id = :tenant_id"),
        {"tenant_id": tenant_id},
    ).scalar()

    return {
        "contacts": contacts_count or 0,
        "active_scenarios": scenarios_count or 0,
        "exercises": exercises_count or 0,
        "checklist_items": checklists_count or 0,
    }