declare function GM_fetch(input: string | URL | globalThis.Request, init?: RequestInit): Promise<Response>
import '../GM_fetch'

async function getPricesToken(): Promise<string> {
  return new Promise<any>((resolve, reject) => {
    GM_fetch('https://api2.prices.tf/auth/access', {
      method: 'post',
      headers: new Headers({
        'Accept': 'application/json'
      })
    })
      .then((response) => {
        if (response.status != 200) {
          reject(response.status)
        }
        return response.json()
      })
      .then((responseData) => resolve(responseData['accessToken']))
  })
}

class PricesResponse {
  keys: number
  metal: number
}

/**
 * Fetches the current price data for Team Fortress 2 items from prices.tf.
 *
 * This function authenticates with the prices.tf API using the provided token,
 * and uses it to fetch the latest pricing data for the given item in keys and metal.
 *
 * @example
 * const price = await priceUsingPricesTF(token, '105;11');
 * console.log("Strange Brigade Helm price: ${price.keys} keys ${price.metal} metal")
 *
 * @returns {Promise<PricesResponse>} Object containing 'keys' and 'metal' prices
 * @throws When authentication fails or API returns non-200 status code
 */
async function priceUsingPricesTF(token: string, sku: string): Promise<PricesResponse> {
  // prices.tf
  // https://api2.prices.tf/prices/${sku}
  // Authorization: Bearer ${token}
  return new Promise(async (resolve, reject) => {
    if (!token) {
      reject(401)
    }
    var response = await GM_fetch(`https://api2.prices.tf/prices/${encodeURIComponent(sku)}`, {
      method: 'get',
      headers: new Headers({
        'Accept': 'application/json',
        'Authorization': `Bearer ${token}`
      })
    })
    if (response.status === 404 && sku.includes(';')) {
      const quality: number = parseInt(sku.split(';')[1], 10);
      if(quality === 6) {
        // Try uncraftable variant if unique weapon
        response = await GM_fetch(`https://api2.prices.tf/prices/${encodeURIComponent(sku + ';uncraftable')}`, {
          method: 'get',
          headers: new Headers({
            'Accept': 'application/json',
            'Authorization': `Bearer ${token}`
          })
        })
      }
    }
    if (response.status === 200) {
      const json = await response.json()
      resolve({ keys: json['sellKeys'], metal: json['sellHalfScrap'] / 18.0 })
    } else {
      reject(response.status)
    }
  })
}

export { getPricesToken, priceUsingPricesTF, PricesResponse }