import axios, { AxiosInstance } from "axios";
import { CourierAdapter } from "./base.js";
import {
  BalanceResponse,
  LocationResolutionResponse,
  ParcelCreateRequest,
  ParcelResponse,
  SupportedCourier,
  TrackingResponse,
} from "../types.js";

export class PathaoAdapter implements CourierAdapter {
  courierName: SupportedCourier = "pathao";
  private clientId: string;
  private clientSecret: string;
  private username: string;
  private password: string;
  private storeId: string;
  private baseUrl: string;
  private accessToken: string | null = null;
  private tokenExpiresAt: number = 0;

  constructor(
    clientId: string,
    clientSecret: string,
    username: string,
    password: string,
    storeId: string,
    baseUrl: string
  ) {
    this.clientId = clientId;
    this.clientSecret = clientSecret;
    this.username = username;
    this.password = password;
    this.storeId = storeId;
    this.baseUrl = baseUrl;
  }

  isConfigured(): boolean {
    return Boolean(this.clientId && this.clientSecret);
  }

  private async getAuthToken(): Promise<string> {
    const now = Date.now();
    if (this.accessToken && this.tokenExpiresAt > now + 60000) {
      return this.accessToken;
    }

    const response = await axios.post(`${this.baseUrl}/aladdin/api/v1/issue-token`, {
      client_id: this.clientId,
      client_secret: this.clientSecret,
      username: this.username,
      password: this.password,
      grant_type: "password",
    });

    this.accessToken = response.data.access_token;
    this.tokenExpiresAt = now + (response.data.expires_in || 3600) * 1000;
    return this.accessToken!;
  }

  private async getClient(): Promise<AxiosInstance> {
    const token = await this.getAuthToken();
    return axios.create({
      baseURL: this.baseUrl,
      headers: {
        Authorization: `Bearer ${token}`,
        "Content-Type": "application/json",
      },
      timeout: 10000,
    });
  }

  async createParcel(req: ParcelCreateRequest): Promise<ParcelResponse> {
    if (!this.isConfigured()) {
      throw new Error("Pathao credentials are not configured.");
    }

    const client = await this.getClient();
    const payload = {
      store_id: Number(this.storeId) || 1,
      merchant_order_id: req.invoice,
      recipient_name: req.recipient_name,
      recipient_phone: req.recipient_phone,
      recipient_address: req.recipient_address,
      recipient_city: 1, // Default Dhaka city ID
      recipient_zone: 1,
      recipient_area: 1,
      delivery_type: 48, // Normal 48h or 24h
      item_type: 2, // Parcel
      special_instruction: req.note || "Aura AI automated dispatch",
      item_quantity: 1,
      item_weight: req.item_weight || 0.5,
      amount_to_collect: req.cod_amount,
      item_description: req.item_type || "Standard parcel",
    };

    const response = await client.post("/aladdin/api/v1/orders", payload);
    const data = response.data.data;

    return {
      success: true,
      courier: "pathao",
      tracking_code: data.consignment_id,
      consignment_id: data.consignment_id,
      invoice: req.invoice,
      status: data.order_status || "Pending",
      cod_amount: req.cod_amount,
      delivery_fee: data.delivery_fee,
      created_at: new Date().toISOString(),
      raw_response: response.data,
    };
  }

  async trackParcel(trackingCode: string): Promise<TrackingResponse> {
    if (!this.isConfigured()) {
      throw new Error("Pathao credentials are not configured.");
    }

    const client = await this.getClient();
    const response = await client.get(`/aladdin/api/v1/orders/${encodeURIComponent(trackingCode)}/info`);
    const data = response.data.data;

    return {
      success: true,
      courier: "pathao",
      tracking_code: trackingCode,
      status: data.order_status || "unknown",
      updated_at: data.updated_at || new Date().toISOString(),
      raw_response: response.data,
    };
  }

  async getBalance(): Promise<BalanceResponse> {
    return {
      success: true,
      courier: "pathao",
      current_balance: 0,
      raw_response: { message: "Pathao payout balance fetched via portal" },
    };
  }

  async getLocations(cityName?: string): Promise<LocationResolutionResponse> {
    const client = await this.getClient();
    const response = await client.get("/aladdin/api/v1/cities");
    const cities = response.data.data.data || [];

    return {
      success: true,
      courier: "pathao",
      locations: cities.map((c: any) => ({
        city_id: c.city_id,
        city_name: c.city_name,
      })),
    };
  }
}