from capsulflask.btcpay.exceptions import *
from capsulflask.btcpay import key_utils
import requests
import json
import re

class Client:
  def __init__(self, api_uri="https://bitpay.com", insecure=False, pem=key_utils.generate_pem(), tokens={}):
    self.uri = api_uri
    self.verify = not(insecure)
    self.pem = pem
    self.client_id = key_utils.get_sin_from_pem(pem)
    self.tokens = tokens
    self.user_agent = 'bitpay-python'

  def create_invoice(self, params):
    self.verify_invoice_params(params['price'], params['currency'])
    payload = json.dumps(params)
    uri = self.uri + "/invoices"
    xidentity = key_utils.get_compressed_public_key_from_pem(self.pem)
    xsignature = key_utils.sign(uri + payload, self.pem)
    headers = {"content-type": "application/json", 'X-Identity': xidentity, 'X-Signature': xsignature, 'X-accept-version': '2.0.0'}
    try:
      response = requests.post(uri, data=payload, headers=headers, verify=self.verify)
    except Exception as pro:
      raise BtcPayConnectionError(pro.args)
    if response.ok:
      return response.json()['data']
    self.response_error(response)

  def get_invoice(self, invoice_id):
    uri = self.uri + "/invoices/" + invoice_id
    xidentity = key_utils.get_compressed_public_key_from_pem(self.pem)
    xsignature = key_utils.sign(uri, self.pem)
    headers = {"content-type": "application/json", 'X-Identity': xidentity, 'X-Signature': xsignature, 'X-accept-version': '2.0.0'}

    try:
      response = requests.get(uri, headers=headers, verify=self.verify)
    except Exception as pro:
      raise BtcPayConnectionError(pro.args)
    if response.ok:
      return response.json()['data']
    self.response_error(response)

  def verify_invoice_params(self, price, currency):
    if re.match("^[A-Z]{3,3}$", currency) is None:
      raise BtcPayArgumentError("Currency is invalid.")
    try: 
      float(price)
    except:
      raise BtcPayArgumentError("Price must be formatted as a float")
    
  def response_error(self, response):
    error_message = response.text
    try:
      error_json = json.loads(error_message)
      error_message = error_json['error']
    except:
      pass
    raise BtcPayBtcPayError('%(code)d: %(message)s' % {'code': response.status_code, 'message': error_message})

  def unsigned_request(self, path, payload=None):
    """
    generic btcpay usigned wrapper
    passing a payload will do a POST, otherwise a GET
    """
    headers = {"content-type": "application/json", "X-accept-version": "2.0.0"}
    try:
      if payload:
        response = requests.post(self.uri + path, verify=self.verify, data=json.dumps(payload), headers=headers)
      else:
        response = requests.get(self.uri + path, verify=self.verify, headers=headers)
    except Exception as pro:
      raise BtcPayConnectionError('Connection refused')
    return response

  def unsigned_get_request(self, path, payload=None):
    """
    Deprecated, will be removed in 2.4
    """
    return self.unsigned_request('/tokens', payload)