"""Unified contact routes — CRUD, contactpersons, FTS search, export, soft-delete."""

from __future__ import annotations

import csv
import io
import uuid

from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
from fastapi.responses import StreamingResponse
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.db import get_db
from app.deps import require_permission
from app.schemas.contact import (
    ContactCreate,
    ContactUpdate,
    ContactPersonCreate,
    ContactPersonUpdate,
)
from app.services import contact_service

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


@router.get("")
async def list_contacts(
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    search: str | None = Query(None),
    type: str | None = Query(None, pattern="^(company|person)$"),
    sort_by: str = Query("displayname"),
    sort_order: str = Query("asc", pattern="^(asc|desc)$"),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:read")),
):
    """List contacts with pagination, FTS search, type filter, sorting."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    return await contact_service.list_contacts(
        db, tenant_id,
        page=page, page_size=page_size, search=search,
        contact_type=type, sort_by=sort_by, sort_order=sort_order,
        resolved_perms=current_user,
    )


@router.get("/export")
async def export_contacts(
    format: str = Query("csv", pattern="^(csv)$"),
    type: str | None = Query(None, pattern="^(company|person)$"),
    search: str | None = Query(None),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:read")),
):
    """Stream contacts as CSV."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    csv_data = await contact_service.export_contacts_csv(db, tenant_id, contact_type=type, search=search)
    return StreamingResponse(
        io.StringIO(csv_data),
        media_type="text/csv",
        headers={"Content-Disposition": "attachment; filename=contacts.csv"},
    )


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_contact(
    body: ContactCreate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:write")),
):
    """Create a new contact (company or person)."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    data = body.model_dump(exclude_none=True)
    return await contact_service.create_contact(db, tenant_id, user_id, data)


@router.get("/{contact_id}")
async def get_contact(
    contact_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:read")),
):
    """Get a single contact with contact_persons."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        return await contact_service.get_contact(db, tenant_id, contact_id)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.put("/{contact_id}")
async def update_contact(
    contact_id: str,
    body: ContactUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:write")),
):
    """Update a contact."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    data = body.model_dump(exclude_none=True)
    try:
        return await contact_service.update_contact(db, tenant_id, user_id, contact_id, data)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.delete("/{contact_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_contact(
    contact_id: str,
    hard: bool = Query(False, description="GDPR hard-delete"),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:write")),
):
    """Soft-delete (or hard-delete with ?hard=true) a contact."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        if hard:
            await contact_service.hard_delete_contact(db, tenant_id, contact_id)
        else:
            await contact_service.delete_contact(db, tenant_id, contact_id)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


# ── ContactPersons ──

@router.get("/{contact_id}/persons")
async def list_contact_persons(
    contact_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:read")),
):
    """List all contact persons for a contact."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    return await contact_service.list_contact_persons(db, tenant_id, contact_id)


@router.post("/{contact_id}/persons", status_code=status.HTTP_201_CREATED)
async def create_contact_person(
    contact_id: str,
    body: ContactPersonCreate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:write")),
):
    """Add a contact person to a contact."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    data = body.model_dump(exclude_none=True)
    try:
        return await contact_service.create_contact_person(db, tenant_id, user_id, contact_id, data)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.put("/{contact_id}/persons/{person_id}")
async def update_contact_person(
    contact_id: str,
    person_id: str,
    body: ContactPersonUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:write")),
):
    """Update a contact person."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    data = body.model_dump(exclude_none=True)
    try:
        return await contact_service.update_contact_person(db, tenant_id, user_id, contact_id, person_id, data)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.delete("/{contact_id}/persons/{person_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_contact_person(
    contact_id: str,
    person_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("contacts:write")),
):
    """Delete a contact person."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        await contact_service.delete_contact_person(db, tenant_id, contact_id, person_id)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))