import {
  buildInvitationUrl,
  generateInvitationToken,
  getOrderUpdateForDeliveryInvitationAction,
  hashInvitationToken,
  normalizeAvailableSlots,
  resolvePublicAppUrl,
} from "../_shared/delivery-invitations.ts";
import { channelFromProvider, createServiceClient, json } 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 {
      orderId?: string;
      orderNumber?: string;
      customerName?: string;
      customerPhone?: string;
      customerMessenger?: string;
      availableSlots?: string[];
    };

    if (!body.orderId) {
      return json({ error: "orderId is required" }, 400);
    }

    const token = generateInvitationToken();
    const tokenHash = await hashInvitationToken(token);
    const supabase = createServiceClient();
    const orderUpdate = getOrderUpdateForDeliveryInvitationAction("create_delivery_invitation");

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

    if (orderError) {
      throw orderError;
    }

    const { data: existingInvitation, error: existingInvitationError } = await supabase
      .from("delivery_invitations")
      .select("id, state, available_slots, order_number, customer_name, customer_phone, customer_messenger, delivery_date, delivery_time, sent_at, opened_at, confirmed_at")
      .eq("order_id", body.orderId)
      .maybeSingle();

    if (existingInvitationError) {
      throw existingInvitationError;
    }

    if (currentOrder.delivery_flow_started_at || existingInvitation) {
      return new Response(
        JSON.stringify({
          ok: true,
          alreadyStarted: true,
          invitation: existingInvitation
            ? {
                orderId: body.orderId,
                state: existingInvitation.state,
                availableSlots: existingInvitation.available_slots || [],
                orderNumber: existingInvitation.order_number || body.orderNumber || null,
                customerName: existingInvitation.customer_name || body.customerName || null,
                customerPhone: existingInvitation.customer_phone || body.customerPhone || null,
                customerMessenger: existingInvitation.customer_messenger || body.customerMessenger || null,
              }
            : {
                orderId: body.orderId,
                state: "awaiting_choice",
              },
        }),
        {
          headers: {
            ...corsHeaders,
            "Content-Type": "application/json",
          },
        },
      );
    }

    const invitationPayload = {
      order_id: body.orderId,
      token_hash: tokenHash,
      state: "awaiting_choice",
      order_number: body.orderNumber || null,
      customer_name: body.customerName || null,
      customer_phone: body.customerPhone || null,
      customer_messenger: body.customerMessenger || null,
      available_slots: normalizeAvailableSlots(body.availableSlots),
      sent_at: new Date().toISOString(),
    };

    const { error: invitationError } = await supabase.from("delivery_invitations").insert(invitationPayload);

    if (invitationError) {
      throw invitationError;
    }

    const { error: updateError } = await supabase
      .from("orders")
      .update({
        status: orderUpdate?.status,
        delivery_agreement_status: orderUpdate?.deliveryAgreementStatus,
        ready_for_delivery_at: currentOrder.ready_for_delivery_at || new Date().toISOString(),
        delivery_flow_started_at: new Date().toISOString(),
        delivery_flow_source: body.source || "n8n",
      })
      .eq("id", body.orderId);

    if (updateError) {
      throw updateError;
    }

    const { error: historyError } = await supabase.from("order_history").insert({
      order_id: body.orderId,
      action: "Создание приглашения доставки",
      old_status: currentOrder.status,
      new_status: orderUpdate?.status,
      metadata: {
        old_delivery_agreement_status: currentOrder.delivery_agreement_status,
        new_delivery_agreement_status: orderUpdate?.deliveryAgreementStatus,
        channel: channelFromProvider("telegram"),
      },
    });

    if (historyError) {
      throw historyError;
    }

    await insertIntegrationEvent(supabase, {
      order_id: body.orderId,
      event_type: "delivery_invitation_created",
      direction: "outbound",
      status: "success",
      payload: {
        token_hash: tokenHash,
        available_slots: invitationPayload.available_slots,
      },
    });

    const publicBaseUrl = resolvePublicAppUrl(request);

    return new Response(
      JSON.stringify({
        ok: true,
        invitation: {
          orderId: body.orderId,
          token,
          url: buildInvitationUrl(publicBaseUrl, token),
          state: "awaiting_choice",
          availableSlots: invitationPayload.available_slots,
        },
      }),
      {
        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",
        },
      },
    );
  }
});