"use strict";

let qs = require("querystring");

let request = require("@root/request");

let PayPal = {};
PayPal.init = function (client_id, client_secret, env, opts) {
  if (!opts) {
    opts = {};
  }
  if (!("total_required" in opts)) {
    opts.total_required = true;
  }
  if (!opts.page_size) {
    opts.page_size = 20;
  }
  if (!opts.prefer) {
    opts.prefer = "return=representation";
  }

  PayPal.__sandboxApiBaseUrl = "https://api-m.sandbox.paypal.com";
  PayPal.__liveApiBaseUrl = "https://api.paypal.com";
  if ("live" === env) {
    PayPal.__baseUrl = PayPal.__liveApiBaseUrl;
  } else {
    PayPal.__baseUrl = PayPal.__sandboxApiBaseUrl;
    console.debug("[PayPal Checkout] ENVIRONMENT=sandbox");
  }
  PayPal.__id = client_id;
  PayPal.__secret = client_secret;
  PayPal.__defaultQuery = {
    page_size: opts.page_size,
    total_required: opts.total_required,
    page: 1,
  };
  PayPal.__prefer = opts.prefer;
};
PayPal.request = async function _paypalRequest(reqObj) {
  let headers = {};
  if (reqObj.request_id) {
    // Optional and if passed, helps identify idempotent requests
    headers["PayPal-Request-Id"] = reqObj.request_id;
  }
  // ex: https://api-m.sandbox.paypal.com/v1/billing/subscriptions
  reqObj.url = `${PayPal.__baseUrl}${reqObj.url}`;
  reqObj.headers = Object.assign(headers, reqObj.headers || {});
  reqObj.auth = {
    user: PayPal.__id,
    pass: PayPal.__secret,
  };
  return await request(reqObj).then(sanitize);
};
PayPal._patch = function (obj) {
  let ops = [];

  Object.keys(obj).forEach(function (k) {
    let val = obj[k];
    if ("undefined" === typeof val) {
      return;
    }

    let op = "replace";
    if (null === val) {
      op = "delete";
      val = undefined;
    }

    ops.push({
      path: `/${k}`,
      op: op,
      value: val,
    });
  });

  return ops;
};

function justBody(resp) {
  return resp.body;
}

function sanitize(resp) {
  resp = resp.toJSON();
  Object.keys(resp.headers).forEach(function (k) {
    if (k.toLowerCase().match(/Auth|Cookie|Token|Key/i)) {
      resp.headers[k] = "[redacted]";
    }
  });
  Object.keys(resp.request.headers).forEach(function (k) {
    if (k.toLowerCase().match(/Auth|Cookie|Token|Key/i)) {
      resp.request.headers[k] = "[redacted]";
    }
  });
  return resp;
}

function must201or200(resp) {
  if (![200, 201].includes(resp.statusCode)) {
    let err = new Error("[@root/paypal-checkout] bad response");
    err.response = resp;
    throw err;
  }
  return resp;
}
function must204or200(resp) {
  if (![200, 204].includes(resp.statusCode)) {
    let err = new Error("[@root/paypal-checkout] bad response");
    err.response = resp;
    throw err;
  }
  return resp;
}

/*
function enumify(obj) {
  Object.keys(obj).forEach(function (k) {
    obj[k] = k;
  });
}
*/

let shipping_preferences = {
  GET_FROM_FILE: "GET_FROM_FILE", // provided, or selectable from PayPal addresses
  SET_PROVIDED_ADDRESS: "SET_PROVIDED_ADDRESS", // user can't change it here
  NO_SHIPPING: "NO_SHIPPING", // duh
};

let Order = {};
Order.intents = {
  CAPTURE: "CAPTURE",
  AUTHORIZE: "AUTHORIZE",
};
Order.user_actions = {
  CONTINUE: "CONTINUE",
  PAY_NOW: "PAY_NOW",
};
Order.shipping_preferences = shipping_preferences;
// See
// https://developer.paypal.com/docs/api/orders/v2/#orders_create
// https://developer.paypal.com/docs/api/orders/v2/#definition-purchase_unit_request
// https://developer.paypal.com/docs/api/orders/v2/#definition-order_application_context
Order.createRequest = async function (order) {
  if (!order.intent) {
    order.intent = Order.intents.CAPTURE;
  }
  if (!order.purchase_units?.length) {
    throw new Error("must have 'purchase_units'");
  }

  /*
   {
      intent: "CAPTURE",
      purchase_units: [
        {
          amount: {
            currency_code: "USD",
            value: "100.00",
          },
        },
      ],
    }
  */
  return await PayPal.request({
    method: "POST",
    url: `/v2/checkout/orders`,
    json: order,
  })
    .then(must201or200)
    .then(justBody);
};

Order.details = async function (id) {
  return await PayPal.request({
    url: `/v2/checkout/orders/${id}`,
    json: true,
  })
    .then(must201or200) // 200
    .then(justBody);
};

/**
 * Captures (finalizes) an approved order.
 * @param {String} id
 * @param {any} body
 */
Order.capture = async function (id, { note_to_payer, final_capture }) {
  return await PayPal.request({
    method: "POST",
    url: `/v2/checkout/orders/${id}/capture`,
    json: { note_to_payer, final_capture },
  })
    .then(must201or200)
    .then(justBody);
};

let Product = {};

// SaaS would be type=SERVICE, category=SOFTWARE
Product.types = {
  DIGITAL: "DIGITAL",
  PHYSICAL: "PHYSICAL",
  SERVICE: "SERVICE",
};
Product.__typeNames = Object.keys(Product.types);

// Documented under "categories" at
// https://developer.paypal.com/docs/api/catalog-products/v1/

// Optionally load the full list
// (for those that want the type linting)
try {
  // the full list
  Product.categories = require("@root/paypal-checkout-product-categories");
} catch {
  // the short list
  Product.categories = {
    SOFTWARE: "SOFTWARE",
    PHYSICAL_GOOD: "PHYSICAL_GOOD",
    DIGITAL_MEDIA_BOOKS_MOVIES_MUSIC: "DIGITAL_MEDIA_BOOKS_MOVIES_MUSIC",
    DIGITAL_GAMES: "DIGITAL_GAMES",
  };
}
Product.__categoryNames = Object.keys(Product.categories);

Product.create = async function _createProduct({
  request_id,
  name,
  description,
  type,
  category,
  image_url,
  home_url,
}) {
  if (request_id) {
    if (!request_id.startsWith("PROD-")) {
      console.warn(`Warn: product ID should start with "PROD-"`);
    }
  }
  if (!Product.__typeNames.includes(type)) {
    console.warn(`Warn: unknown product type '${type}'`);
  }
  if (!Product.__categoryNames.includes(category)) {
    console.warn(`Warn: unknown product category '${category}'`);
  }

  return await PayPal.request({
    method: "POST",
    url: "/v1/catalogs/products",
    request_id: request_id,
    json: {
      // ex: "Video Streaming Service"
      name: name,
      // ex: "Video streaming service"
      description: description,
      // ex: "SERVICE", "PHYSICAL", "DIGITAL"
      type: type,
      // ex: "SOFTWARE", "PHYSICAL_GOOD"
      category: category,
      // ex: "https://example.com/streaming.jpg"
      image_url: image_url,
      // ex: "https://example.com/home"
      home_url: home_url,
    },
  })
    .then(must201or200)
    .then(justBody);
};

Product.list = async function _listProducts(query = {}) {
  query = Object.assign({}, PayPal.__defaultQuery, query);
  let search = qs.stringify(query);
  return await PayPal.request({
    url: `/v1/catalogs/products?${search}`,
    json: true,
  })
    .then(must201or200)
    .then(justBody);
};

Product.details = async function _showProductDetails(id) {
  return await PayPal.request({
    url: `/v1/catalogs/products/${id}`,
    json: true,
  })
    .then(must201or200)
    .then(justBody);
};

/**
 * Update product info
 * @param id
 * @param {{
 *   description: string,
 *   category: string,
 *   image_url: string,
 *   home_url: string,
 * }}
 */
Product.update = async function _updateProduct(
  id,
  { description, category, image_url, home_url }
) {
  let body = PayPal._patch({ description, category, image_url, home_url });
  return await PayPal.request({
    method: "PATCH",
    url: `/v1/catalogs/products/${id}`,
    json: body,
  }).then(must204or200);
};

let Plan = {};
Plan.intervals = {
  DAY: "DAY",
  WEEK: "WEEK",
  MONTH: "MONTH",
  YEAR: "YEAR",
};

Plan.tenures = {
  TRIAL: "TRIAL",
  REGULAR: "REGULAR",
};

// See https://developer.paypal.com/docs/api/subscriptions/v1/
Plan.create = async function _createPlan({
  request_id,
  status = "ACTIVE",
  product_id,
  name,
  description = "",
  billing_cycles,
  payment_preferences,
  taxes, // optional
  quantity_supported = false,
}) {
  if (request_id) {
    if (!request_id.startsWith("PLAN-")) {
      // ex: PLAN-18062020-001
      console.warn(`Warn: plan ID should start with "PLAN-"`);
    }
  }
  return await PayPal.request({
    method: "POST",
    url: "/v1/billing/plans",
    request_id: request_id,
    // TODO should we make this the default?
    headers: {
      Prefer: "return=representation",
    },
    json: {
      // ex: "PROD-6XB24663H4094933M"
      product_id: product_id,
      // ex: "Basic Plan"
      name: name,
      // ex: "Basic plan"
      description: description,
      // ex: "CREATED", "ACTIVE", "INACTIVE"
      status: status,
      // ex: TODO
      billing_cycles: billing_cycles.map(function (cycle, i) {
        // sequence is the index in the array,
        // which should never be out-of-order
        if (!cycle.frequency.interval_count) {
          cycle.frequency.interval_count = 1;
        }
        cycle.sequence = i + 1;
        if (!cycle.tenure_type) {
          cycle.tenure_type = Plan.tenures.REGULAR;
        }
        if (!cycle.total_cycles) {
          cycle.total_cycles = 0;
        }
        return cycle;
      }),
      // TODO ???
      payment_preferences: payment_preferences,
      taxes: taxes,
      quantity_supported: quantity_supported,
    },
  })
    .then(must201or200)
    .then(justBody);
};

Plan.list = async function _listPlans(query = {}) {
  query = Object.assign({}, PayPal.__defaultQuery, query);
  let search = qs.stringify(query);
  return await PayPal.request({
    url: `/v1/billing/plans?${search}`,
    json: true,
  })
    .then(must201or200)
    .then(justBody);
};

Plan.details = async function _showPlanDetails(id) {
  return await PayPal.request({
    url: `/v1/billing/plans/${id}`,
    json: true,
  })
    .then(must201or200)
    .then(justBody);
};

/**
 * Update plan info
 * @param id
 * @param {{
 *   description: string,
 *   payment_preferences.auto_bill_outstandin: boolean,
 *   taxes.percentage: string,
 *   payment_preferences.payment_failure_threshold: number,
 *   payment_preferences.setup_fee: string,
 *   payment_preferences.setup_fee_failure_action: string,
 * }}
 */
Plan.update = async function _updatePlan(
  id,
  // TODO handle nested keys (ex: 'taxes.percentage')
  { description /*, payment_preferences, taxes*/ }
) {
  return await PayPal.request({
    method: "PATCH",
    url: `/v1/billing/plans/${id}`,
    json: PayPal._patch({ description }),
  }).then(must204or200);
};

let Subscription = {};
Subscription.actions = {
  CONTINUE: "CONTINUE",
  SUBSCRIBE_NOW: "SUBSCRIBE_NOW",
};
Subscription.shipping_preferences = shipping_preferences;
Subscription.payer_selections = {
  PAYPAL: "PAYPAL",
};
Subscription.payee_preferences = {
  UNRESTRICTED: "UNRESTRICTED",
  IMMEDIATE_PAYMENT_REQUIRED: "IMMEDIATE_PAYMENT_REQUIRED",
};

// See https://developer.paypal.com/docs/api/subscriptions/v1/#subscriptions_create
Subscription.createRequest = async function _createSubscription({
  request_id,
  plan_id,
  start_time,
  quantity,
  shipping_amount,
  subscriber,
  application_context,
  custom_id,
  plan,
}) {
  return await PayPal.request({
    method: "POST",
    url: "/v1/billing/subscriptions",
    request_id: request_id,
    json: {
      // ex: "P-5ML4271244454362WXNWU5NQ"
      plan_id: plan_id,
      // ex: "2018-11-01T00:00:00Z" (must be in the future)
      start_time: start_time,
      // ex: "20"
      quantity: quantity,
      // ex: { currency_code: "USD", value: "10.00", },
      shipping_amount: shipping_amount,
      /* ex:
				{
					name: { given_name: "John", surname: "Doe" },
					email_address: "customer@example.com",
					shipping_address: {
						name: { full_name: "John Doe" },
						address: {
							address_line_1: "123 Sesame Street",
							address_line_2: "Building 17",
							admin_area_2: "San Jose",
							admin_area_1: "CA",
							postal_code: "95131",
							country_code: "US",
						},
					}
				}
      */
      subscriber: subscriber,
      /* ex:
				{
					brand_name: "walmart",
					locale: "en-US",
					shipping_preference: "SET_PROVIDED_ADDRESS",
					user_action: "SUBSCRIBE_NOW",
					payment_method: {
						payer_selected: "PAYPAL",
						payee_preferred: "IMMEDIATE_PAYMENT_REQUIRED",
					},
					return_url: "https://example.com/returnUrl",
					cancel_url: "https://example.com/cancelUrl",
				}
      */
      application_context: application_context,
      custom_id: custom_id,
      plan: plan,
    },
  })
    .then(must201or200)
    .then(justBody);
};

Subscription.details = async function _getSubscription(id) {
  return await PayPal.request({
    url: `/v1/billing/subscriptions/${id}`,
    json: true,
  })
    .then(must201or200)
    .then(justBody);
};

/**
 * Cancel a subscription (prevent future auto billing)
 * @param id
 * @param {{
 *   reason: string
 * }}
 */
Subscription.cancel = async function _showProductDetails(id, { reason }) {
  return await PayPal.request({
    method: "POST",
    url: `/v1/catalogs/products/${id}/cancel`,
    json: { reason },
  })
    .then(must201or200)
    .then(justBody);
};

module.exports.init = PayPal.init;
module.exports.request = PayPal.request;
module.exports.Order = Order;
module.exports.Plan = Plan;
module.exports.Product = Product;
module.exports.Subscription = Subscription;