import {
  getOrderUpdateForDeliveryInvitationAction,
  hashInvitationToken,
  isActiveInvitationState,
} from "../_shared/delivery-invitations.ts";
import { createServiceClient } from "../_shared/chatbot.ts";
import { insertIntegrationEvent } from "../_shared/integration-events.ts";

const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
};

Deno.serve(async (request) => {
  if (request.method === "OPTIONS") {
    return new Response("ok", { headers: corsHeaders });
  }

  if (request.method !== "POST") {
    return new Response(JSON.stringify({ error: "Method not allowed" }), {
      status: 405,
      headers: {
        ...corsHeaders,
        "Content-Type": "application/json",
      },
    });
  }

  try {
    const body = (await request.json()) as {
      token?: string;
      deliveryDate?: string;
      deliveryTime?: string;
    };

    if (!body.token) {
      return new Response(JSON.stringify({ error: "token is required" }), {
        status: 400,
        headers: {
          ...corsHeaders,
          "Content-Type": "application/json",
        },
      });
    }

    const tokenHash = await hashInvitationToken(body.token);
    const supabase = createServiceClient();

    const { data: invitation, error: invitationError } = await supabase
      .from("delivery_invitations")
      .select("*")
      .eq("token_hash", tokenHash)
      .single();

    if (invitationError) {
      if (invitationError.code === "PGRST116") {
        return new Response(
          JSON.stringify({ ok: false, error: "Invitation not found" }),
          {
            status: 404,
            headers: {
              ...corsHeaders,
              "Content-Type": "application/json",
            },
          },
        );
      }

      throw invitationError;
    }

    const { data: currentOrder, error: orderError } = await supabase
      .from("orders")
      .select("id, status, delivery_agreement_status")
      .eq("id", invitation.order_id)
      .single();

    if (orderError) {
      throw orderError;
    }

    if (!isActiveInvitationState(invitation.state) || !["Ожидает ответа клиента", "Ожидает согласования доставки"].includes(currentOrder.status)) {
      return new Response(
        JSON.stringify({
          ok: false,
          error: "Invitation is no longer active",
        }),
        {
          status: 409,
          headers: {
            ...corsHeaders,
            "Content-Type": "application/json",
          },
        },
      );
    }

    const orderUpdate = getOrderUpdateForDeliveryInvitationAction("confirm_delivery_choice");
    const deliveryDate = body.deliveryDate || new Date().toISOString().slice(0, 10);
    const deliveryTime = body.deliveryTime || "Первая половина дня";

    const { error: invitationUpdateError } = await supabase
      .from("delivery_invitations")
      .update({
        state: "agreed",
        delivery_date: deliveryDate,
        delivery_time: deliveryTime,
        confirmed_at: new Date().toISOString(),
      })
      .eq("id", invitation.id);

    if (invitationUpdateError) {
      throw invitationUpdateError;
    }

    const { error: orderUpdateError } = await supabase
      .from("orders")
      .update({
        status: orderUpdate?.status,
        delivery_agreement_status: orderUpdate?.deliveryAgreementStatus,
      })
      .eq("id", invitation.order_id);

    if (orderUpdateError) {
      throw orderUpdateError;
    }

    const { error: slotError } = await supabase.from("delivery_slots").insert({
      order_id: invitation.order_id,
      delivery_date: deliveryDate,
      delivery_time: deliveryTime,
      logistician_id: null,
      status: "confirmed_by_client",
    });

    if (slotError) {
      throw slotError;
    }

    const { error: historyError } = await supabase.from("order_history").insert({
      order_id: invitation.order_id,
      action: "Подтверждение выбора доставки клиентом",
      old_status: currentOrder.status,
      new_status: orderUpdate?.status,
      metadata: {
        old_delivery_agreement_status: currentOrder.delivery_agreement_status,
        new_delivery_agreement_status: orderUpdate?.deliveryAgreementStatus,
        delivery_date: deliveryDate,
        delivery_time: deliveryTime,
      },
    });

    if (historyError) {
      throw historyError;
    }

    await insertIntegrationEvent(supabase, {
      order_id: invitation.order_id,
      event_type: "delivery_choice_confirmed",
      direction: "inbound",
      status: "success",
      payload: {
        delivery_date: deliveryDate,
        delivery_time: deliveryTime,
      },
    });

    return new Response(
      JSON.stringify({
        ok: true,
        orderId: invitation.order_id,
        status: orderUpdate?.status,
        deliveryAgreementStatus: orderUpdate?.deliveryAgreementStatus,
      }),
      {
        headers: {
          ...corsHeaders,
          "Content-Type": "application/json",
        },
      },
    );
  } catch (error) {
    return new Response(
      JSON.stringify({
        ok: false,
        error: error instanceof Error ? error.message : "Unexpected error",
      }),
      {
        status: 500,
        headers: {
          ...corsHeaders,
          "Content-Type": "application/json",
        },
      },
    );
  }
});