"""Multi-tenant support: org/team isolation for sessions and data."""

from __future__ import annotations

import os
import time
from typing import Any

from fastapi import APIRouter, Header, HTTPException

from fusionagi._logger import logger

router = APIRouter()

DEFAULT_TENANT = os.environ.get("FUSIONAGI_DEFAULT_TENANT", "default")

# In-memory tenant registry; for production, back with Postgres
_tenant_store: dict[str, dict[str, Any]] = {
    DEFAULT_TENANT: {
        "id": DEFAULT_TENANT,
        "name": "Default Tenant",
        "status": "active",
        "created_at": time.time(),
        "config": {},
    }
}


def resolve_tenant(x_tenant_id: str | None = Header(default=None)) -> str:
    """Resolve tenant from X-Tenant-ID header or default."""
    return x_tenant_id or DEFAULT_TENANT


@router.get("/tenants/current")
def get_current_tenant(x_tenant_id: str | None = Header(default=None)) -> dict[str, Any]:
    """Return the resolved tenant context.

    The tenant is determined from the X-Tenant-ID header.
    Falls back to the default tenant if no header is provided.
    """
    tid = resolve_tenant(x_tenant_id)
    return {
        "tenant_id": tid,
        "is_default": tid == DEFAULT_TENANT,
        "isolation_mode": "logical",
        "exists": tid in _tenant_store,
    }


@router.get("/tenants")
def list_tenants() -> dict[str, Any]:
    """List all registered tenants.

    Returns:
        JSON with tenants array and total count.
    """
    tenants = list(_tenant_store.values())
    return {"tenants": tenants, "total": len(tenants)}


@router.get("/tenants/{tenant_id}")
def get_tenant(tenant_id: str) -> dict[str, Any]:
    """Get a specific tenant by ID.

    Args:
        tenant_id: Tenant identifier.

    Returns:
        Tenant record.

    Raises:
        404 if tenant not found.
    """
    tenant = _tenant_store.get(tenant_id)
    if not tenant:
        raise HTTPException(status_code=404, detail=f"Tenant {tenant_id} not found")
    return tenant


@router.post("/tenants")
def create_tenant(body: dict[str, Any]) -> dict[str, Any]:
    """Register a new tenant.

    Args:
        body: JSON with 'id' and optional 'name', 'config' fields.

    Returns:
        Created tenant record.
    """
    tenant_id = body.get("id", "")
    if not tenant_id:
        raise HTTPException(status_code=400, detail="Tenant ID required")
    if tenant_id in _tenant_store:
        raise HTTPException(status_code=409, detail=f"Tenant {tenant_id} already exists")

    name = body.get("name", tenant_id)
    config = body.get("config", {})
    tenant = {
        "id": tenant_id,
        "name": name,
        "status": "active",
        "created_at": time.time(),
        "config": config,
    }
    _tenant_store[tenant_id] = tenant
    logger.info("Tenant created", extra={"tenant_id": tenant_id, "name": name})
    return tenant


@router.put("/tenants/{tenant_id}")
def update_tenant(tenant_id: str, body: dict[str, Any]) -> dict[str, Any]:
    """Update tenant configuration.

    Args:
        tenant_id: Tenant identifier.
        body: JSON with fields to update (name, config, status).

    Returns:
        Updated tenant record.
    """
    tenant = _tenant_store.get(tenant_id)
    if not tenant:
        raise HTTPException(status_code=404, detail=f"Tenant {tenant_id} not found")

    if "name" in body:
        tenant["name"] = body["name"]
    if "config" in body:
        tenant["config"] = body["config"]
    if "status" in body:
        tenant["status"] = body["status"]

    logger.info("Tenant updated", extra={"tenant_id": tenant_id})
    return tenant


@router.delete("/tenants/{tenant_id}")
def deactivate_tenant(tenant_id: str) -> dict[str, Any]:
    """Deactivate a tenant (soft delete).

    Args:
        tenant_id: Tenant identifier.

    Returns:
        Confirmation with tenant status.
    """
    if tenant_id == DEFAULT_TENANT:
        raise HTTPException(status_code=400, detail="Cannot deactivate default tenant")
    tenant = _tenant_store.get(tenant_id)
    if not tenant:
        raise HTTPException(status_code=404, detail=f"Tenant {tenant_id} not found")
    tenant["status"] = "inactive"
    logger.info("Tenant deactivated", extra={"tenant_id": tenant_id})
    return {"id": tenant_id, "status": "inactive"}