import { Api } from "../utils/api";
import { Paginator } from "../utils/paginator";
import { createParams } from "../utils/queryParams";

export class Products {
	private api: Api;

	/**
	 * Creates a model.
	 * @param api - The API client to use for making requests.
	 */
	constructor(api: Api) {
		this.api = api;
	}

	/**
	 * Fetches a list of products with optional filtering.
	 * @param options - Options for fetching products, like page size and page number.
	 * @param options.active - Filter by active status.
	 * @param options.limit - Maximum number of products to return.
	 * @param options.offset - Number of products to skip.
	 * @returns A paginator containing the list of products.
	 * @example
	 * const products = await productsInstance.getProducts({
	 *   active: true,
	 *   limit: 10
	 * });
	 */
	async getProducts(options?: {
		active?: boolean;
		limit?: number;
		offset?: number;
	}): Promise<Paginator<Products>> {
		let queryParams = "";
		if (options) {
			queryParams = createParams(options, [
				"active",
				"limit",
				"offset",
			]).toString();
		}
		const response = await this.api.get(`v1/products?${queryParams}`);

		const responseObj = response as { products: IProduct[] | null };

		if (
			!responseObj ||
			!Object.prototype.hasOwnProperty.call(responseObj, "products")
		) {
			throw new Error("Invalid response format: missing products property");
		}
		if (!responseObj.products) {
			throw new Error("No products found in response");
		}

		const products = responseObj.products.map((product) => {
			if (product === null) {
				throw new Error("Product data is null");
			}
			return new Product(this, product);
		});

		return Paginator.wrap<Products>(
			this.api,
			{
				...response,
				products,
			},
			"products"
		);
	}

	/**
	 * Creates a new product.
	 * @param data - The data to create a product with.
	 * @returns The newly created product.
	 * @example
	 * const product = await productsInstance.createProduct({
	 *   product_name: "New Product",
	 *   product_short_description: "A great product",
	 *   product_price: 99.99
	 * });
	 */
	async createProduct(data: IProduct): Promise<Product> {
		const response = await this.api.post("v1/products", data);
		return new Product(this, response as IProduct);
	}

	/**
	 * Fetches a single product by ID.
	 * @param productId - The ID of the product to fetch.
	 * @returns The product.
	 * @example
	 * const product = await productsInstance.getProduct(123);
	 */
	async getProduct(productId: number): Promise<Product> {
		const response = await this.api.get(`v1/products/${productId}`);
		return new Product(this, response as IProduct);
	}

	/**
	 * Updates a product.
	 * @param data - The data to update the product with.
	 * @returns The updated product.
	 * @example
	 * const updatedProduct = await productsInstance.updateProduct({
	 *   id: 123,
	 *   product_name: "Updated Product Name"
	 * });
	 */
	async updateProduct(data: IProduct): Promise<Product> {
		if (!data.id) {
			throw new Error("Product ID is required for update");
		}
		const response = await this.api.patch(`v1/products/${data.id}`, data);
		return new Product(this, response as IProduct);
	}

	/**
	 * Deletes a product.
	 * @param productId - The ID of the product to delete.
	 * @returns The result of the API call if it was successful, undefined otherwise.
	 * @throws Will throw an error if the API call fails.
	 */
	async deleteProduct(productId: number): Promise<boolean | undefined> {
		const r = await this.api.delete(`v1/products/${productId}`);
		if (!r) {
			return undefined;
		}
		return true;
	}

	/**
	 * Uploads a product image.
	 * @param productId - The ID of the product to upload the image to.
	 * @param fileData - The base64 encoded image data.
	 * @param fileName - The name of the image.
	 * @param checksum - The checksum of the image.
	 * @returns The result of the API call if it was successful, undefined otherwise.
	 * @throws Will throw an error if the API call fails.
	 */
	async uploadProductImage(
		productId: number,
		fileData: Base64Image,
		fileName: ImageName,
		checksum?: string
	): Promise<boolean | undefined> {
		//Max payload 3 megabytes, the file_data is base64 encoded.
		const r = await this.api.post(`v1/products/${productId}/image`, {
			checksum,
			file_data: fileData,
			file_name: fileName,
		});
		if (!r) {
			return undefined;
		}
		return true;
	}

	/**
	 * Deletes the product image associated with the given product id.
	 * @param productId - The ID of the product to delete the image from.
	 * @returns The result of the API call if it was successful, undefined otherwise.
	 * @throws Will throw an error if the API call fails.
	 */
	async deleteProductImage(productId: number): Promise<boolean | undefined> {
		const r = await this.api.delete(`v1/products/${productId}/image`);
		if (!r) {
			return undefined;
		}
		return true;
	}

	/**
	 * Creates a new subscription plan associated with the given product id.
	 * @param productId - The ID of the product to create the subscription plan for.
	 * @param data - The data to create the subscription plan with.
	 * @returns The newly created subscription plan if the API call was successful, undefined otherwise.
	 * @throws Will throw an error if the API call fails.
	 */
	async createASubscriptionPlan(
		productId: number,
		data: IProductSubscription
	): Promise<IProductSubscription | undefined> {
		const r = await this.api.post(
			`v1/products/${productId}/subscriptions`,
			data
		);
		if (!r) {
			return undefined;
		}
		return r as IProductSubscription;
	}
	/**
	 * Fetches a single subscription plan associated with the given product id.
	 * @param productId - The ID of the product to fetch the subscription plan from.
	 * @param subscriptionId - The ID of the subscription plan to fetch.
	 * @returns The subscription plan if the API call was successful, undefined otherwise.
	 * @throws Will throw an error if the API call fails.
	 */
	async getASubscriptionPlan(
		productId: number,
		subscriptionId: number
	): Promise<IProductSubscription | undefined> {
		const r = await this.api.get(
			`v1/products/${productId}/subscriptions/${subscriptionId}`
		);
		if (!r) {
			return undefined;
		}
		return r as IProductSubscription;
	}

	/**
	 * Deletes a subscription plan associated with the given product id.
	 * @param productId - The ID of the product to delete the subscription plan from.
	 * @param subscriptionId - The ID of the subscription plan to delete.
	 * @returns The result of the API call if it was successful, undefined otherwise.
	 * @throws Will throw an error if the API call fails.
	 */
	async deleteASubscriptionPlan(
		productId: number,
		subscriptionId: number
	): Promise<boolean | undefined> {
		const r = await this.api.delete(
			`v1/products/${productId}/subscriptions/${subscriptionId}`
		);
		if (!r) {
			return undefined;
		}
		return true;
	}
}

class Product {
  private products: Products;
  active?: boolean;
  id: number;
  product_desc?: string;
  product_name: string;
  product_price?: number;
  product_short_desc?: string;
  sku?: string;
  subscription_only?: boolean;
  subscription_plans?: Array<IProductSubscription>;
  url?: string;

  /**
   * Creates a new Product instance from the given data and Products model.
   * @param products - The Products model to use for making requests.
   * @param data - The data to use to populate the Product instance.
   * @throws Will throw an error if any of the required fields are missing.
   */
  constructor(products: Products, data: IProduct) {
    if (!data || !data.id || !data.product_name) {
      throw new Error("Invalid product data");
    }
    this.id = data.id;
    this.product_name = data.product_name;
    Object.assign(this, data);
    this.products = products;
  }

  /**
   * Updates this product with the given data.
   * @param data - The data to update this product with.
   * @returns The updated product if the API call was successful, undefined otherwise.
   */
  update(data: IProduct) {
    Object.assign(this, data);
    return this.products.updateProduct(this);
  }

  /**
   * Deletes this product.
   * @returns The result of the API call if it was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  delete(): Promise<boolean | undefined> {
    return this.products.deleteProduct(this.id);
  }

  /**
   * Refreshes this product from the API.
   * @returns The updated product if the API call was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  refresh(): Promise<Product | undefined> {
    return this.products.getProduct(this.id);
  }

  /**
   * Creates a new subscription plan for this product.
   * @param data - The data to create the subscription plan with.
   * @returns The newly created subscription plan if the API call was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  createSubscriptionPlan(
    data: IProductSubscription
  ): Promise<IProductSubscription | undefined> {
    return this.products.createASubscriptionPlan(this.id, data);
  }

  /**
   * Retrieves a subscription plan associated with this product.
   * @param subscriptionId - The ID of the subscription plan to retrieve.
   * @returns The subscription plan if the API call was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  getSubscriptionPlan(
    subscriptionId: number
  ): Promise<IProductSubscription | undefined> {
    return this.products.getASubscriptionPlan(this.id, subscriptionId);
  }

  /**
   * Deletes a subscription plan associated with this product.
   * @param subscriptionId - The ID of the subscription plan to delete.
   * @returns The result of the API call if it was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  deleteSubscriptionPlan(subscriptionId: number): Promise<boolean | undefined> {
    return this.products.deleteASubscriptionPlan(this.id, subscriptionId);
  }

  /**
   * Uploads a product image associated with this product.
   * @param fileData - The base64 encoded image data.
   * @param fileName - The name of the image.
   * @param checksum - The checksum of the image.
   * @returns The result of the API call if it was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  uploadImage(
    fileData: Base64Image,
    fileName: ImageName,
    checksum: string
  ): Promise<boolean | undefined> {
    return this.products.uploadProductImage(
      this.id,
      fileData,
      fileName,
      checksum
    );
  }

  /**
   * Deletes the product image associated with this product.
   * @returns The result of the API call if it was successful, undefined otherwise.
   * @throws Will throw an error if the API call fails.
   */
  deleteImage(): Promise<boolean | undefined> {
    return this.products.deleteProductImage(this.id);
  }
}