from datetime import datetime, timedelta
from flask import current_app
import requests, time, subprocess, re

# How can we update coder admin_token??? What is the maximum expiration days?
# coder server --max-token-lifetime. Default 2540400 hours = 290 days
# The maximum lifetime duration users can specify when creating an API token.
# coder tokens create --lifetime. Default 720 hours = 30 days
# Specify a duration for the lifetime of the token.
# Create token API key - curl -X POST http://coder-server:8080/api/v2/users/{user}/keys/tokens
# {
#  "lifetime": 0,
#  "scope": "all",
#  "token_name": "string"
# }

admin_token = 'gNmzL1TLeN-gXfs7q10uWPINqtlpt02Pj'
template_id = 'a5577a86-e700-41be-997b-6001d78061d4'
user_email = 'learn@akamai.com'
user_pwd = 'Qodnwk=$s8'

token_header = {'Coder-Session-Token': admin_token,
                'Accept': 'application/json'}
token_param = {'email': user_email, 'password': user_pwd}

# unused hours of workspace
unused_hours = 2

# workspace ttl ms
ttl = 86400000  # 24 hours

#########################################################################################
# functions for end-users start
# functions below are invoked when end-user click the link/button to get a workspace
# list_workspaces(), search_workspaces(), create_workspace_name, update_workspace(), is_workspace_running(), is_agent_connected(), is_app_ready()
##########################################################################################

# this function get the all workspaces under the specified coder owner
def list_workspaces(owner):
    current_app.logger.debug('workspace_owner= %s', owner)
    url = 'http://localhost:3000/api/v2/workspaces?owner=' + owner
    response = requests.get(url, headers=token_header)
    s_code = response.status_code
    body = response.json()
    current_app.logger.debug('list_workspace status code: '+str(s_code))
    workspaces = []
    if s_code == 200:
        for workspace in body['workspaces']:
            if workspace['owner_name'] == owner:
                workspaces.append(workspace)
    else:
        current_app.logger.info('cannot get workspaces list')
        workspaces = None

    return workspaces

# this function is main logic which finds an available workspace and return it
def search_workspaces(workspaces, hours):
    pattern = r'^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{1-6}Z$'
    selectedWorkspace = None
    email = None
    current_app.logger.debug('hours= '+str(hours))
    # current_app.logger.debug('workspaces= '+str(workspaces))
    for workspace in workspaces:
        current_app.logger.debug('workspace= '+str(workspace))
        is_selected = False
        workspace_name = workspace['name']
        current_app.logger.debug('workspace_name= '+workspace_name)

        # 'last_used_at' looked useful. But it is updated too late. 5-10 minutes gap.
        # so, we gave up using it.
        # two code lines below remains just to show the debugging information.
        last_used_at = workspace['last_used_at']
        current_app.logger.debug('last_used_at= %s', last_used_at)

        # Each time a workspace is assigned to an end-user, we rename the workspace to the current time.
        # so, we use workspace name as 'last_assigned_at' variable
        last_assigned_at = datetime.strptime(workspace['name'], '%Y%m%d%H%M%S')
        current_app.logger.debug('last_assigned_at= %s', last_assigned_at)
        currentDate = datetime.now()
        current_app.logger.debug('now= %s', currentDate)
        # we calculate how many hours has past since the last time the workspace was assigned.
        current_app.logger.debug(currentDate - last_assigned_at)
        difference = (currentDate - last_assigned_at).total_seconds() / 3600
        current_app.logger.debug('hoursSinceLastAssigned= '+str(difference)+' hour(s)')

        # if the workspace has been unassigned status longer than unused_hours, we select the workspace.
        if difference > hours:  
            is_selected = True

        # if workspace is selected, we update its name to the current timestamp
        if is_selected:
            selectedWorkspace =update_workspace(workspace)
            current_app.logger.debug('selected workspace= '+str(selectedWorkspace))
            break

    if selectedWorkspace == None:
        current_app.logger.info('cannot find an available workspace')
        # we need to call create_workspaces() asynchronously
    
    return selectedWorkspace

# this function creates a new workspace name based on current time
# How can I make sure this function is thread-safe, to avoid duplicate workspace_names???
def create_workspace_name():
#    past = timedelta(hours=-unused_hours)
#    new_name = datetime.now() + past
    new_name = str(datetime.now().strftime('%Y%m%d%H%M%S'))
    current_app.logger.debug('new_name= %s'+new_name)
    return new_name

# this function updates a selected workspace with a new name created from create_workspace_name()
def update_workspace(workspace):
    selected_workspace = None
    workspace_id = workspace['id']
    workspace_name = workspace['name']
    url = 'http://localhost:3000/api/v2/workspaces/' + workspace_id
    new_name = create_workspace_name()
    current_app.logger.debug('new_name= %s', new_name)
    req_body = {"username": "a", "name": new_name}
    current_app.logger.debug('update_workspace req_body= %s', req_body)

    response = requests.patch(url, json=req_body, headers=token_header)
    s_code = response.status_code
    current_app.logger.debug('update_workspace status code: %s', str(s_code))
    # body = response.json()
    current_app.logger.debug('update_workspace response body: %s', response.content)

    if s_code == 204:
        current_app.logger.debug('workspace %s is updated to %s', workspace_name, new_name)
        selected_workspace = requests.get('http://localhost:3000/api/v2/users/a/workspace/'+ new_name, headers=token_header).json()
        current_app.logger.info('selected_workspace= %s', selected_workspace)
        # following code lines double-check whether the workspace is successfully created or not.
        # we commented them out. we might want to use them again for debugging later.
        # time.sleep(0.5)
        # response = requests.get(
        #    'http://localhost:3000/api/v2/users/a/workspace/'+new_name, headers=token_header)
        # s_code = response.status_code
        # current_app.logger.debug(response.content)
        #if s_code != 200:
        #    current_app.logger.info('cannot check update status of workspace ' + workspace_name)
        # workspace = response.json()
    else:
        current_app.logger.info('cannot update workspace %s', workspace_name)
    return selected_workspace

# first, check workspace status
def is_workspace_running(user_id):
    workspace_status = 'unknown'
    status_url = 'http://localhost:3000/api/v2/users/a/workspace/'+user_id
    status_response = requests.get(status_url, headers=token_header)
    current_app.logger.debug(user_id + ": is_workspace_running status code: " +
                     str(status_response.status_code))
    status_json = status_response.json()

    if status_json['latest_build']['status'] == 'running':
        current_app.logger.info(user_id + ': workspace is running')
        return True
    else:
        current_app.logger.info(user_id + ': workspace is NOT running')
        return False

# if workspace is not running, start it
def start_workspace(user_id):
    command = 'coder start a/'+user_id
    result = subprocess.run([command], shell=True,
                            capture_output=True, text=True)
    current_app.logger.debug(user_id + ': ' + result.stdout)
    s_code = result.returncode
    if s_code == 0:
        return True
    else:
        return False
    
# second, check the agent of the workspace
# if it is not ready, wait   
def is_agent_connected(user_id):
    agent_status = 'unknown'
    count = 0
    while agent_status != 'connected':
        status_url = 'http://localhost:3000/api/v2/users/a/workspace/'+user_id
        status_response = requests.get(status_url, headers=token_header)
        current_app.logger.debug(
            user_id + ": is_agent_connected status code: " + str(status_response.status_code))
        status_json = status_response.json()
        # app.logger.debug(user_id + ': '+str(status_json))
        if len(status_json['latest_build']['resources']) > 1:
            for resource in status_json['latest_build']['resources']:
                if resource['type'] == 'docker_container':
                    for agent in resource['agents']:
                        if agent['name'] == 'main':
                            agent_status = agent['status']
                            current_app.logger.info(
                                user_id + ": agent status: " + agent_status)
                            if agent_status == 'timeout' or agent_status == 'connected':
                                break
        count += 1
        # will check coder is ready for the new url
        time.sleep(1)

    current_app.logger.debug(user_id + ": api call count: "+str(count))

    if agent_status == 'connected':
        return True
    else:
        return False

# third, check the app running inside the workspace
# there are 2 apps. coder-server and OWASP juice-shop
def is_app_ready(url):
    is_ready = False
    while True:
        response = requests.get(url)
        s_code = response.status_code
        current_app.logger.debug('%s status code= %s', url, s_code)
        if s_code == 200:
            is_ready = True
            break
        else:
            time.sleep(1)
    return is_ready

########################################################################################
# functions for end-users end
########################################################################################



##########################################################
# The following functions are for administrator only!!! #
#########################################################

# create a workspace
def create_workspace():
    url = 'http://localhost:3000/api/v2/organizations/1a453979-dbd0-49f5-8d4c-5188c9027466/members/a/workspaces'
    workspace_name = create_workspace_name()
    param = {"name": workspace_name,
             "template_id": "a5577a86-e700-41be-997b-6001d78061d4", "ttl_ms": ttl}

    response = requests.post(url, json=param, headers=token_header)
    s_code = response.status_code
    current_app.logger.info(workspace_name +
                     ": create_workspace status: " + str(s_code))
    body = response.json()
    current_app.logger.debug(workspace_name + ': create_workspace body: ' + str(body))
    if s_code == 201:
        current_app.logger.info(workspace_name +" is created")
    else:
        current_app.logger.info(workspace_name +" cannot create a new workspace")
        body = None
    return body

# create workspaces by the input numbers
def create_workspaces(number_of_workspaces):
    workspaces = []
    for i in range(number_of_workspaces):
        workspace = create_workspace()
        workspaces.append(workspace)
        time.sleep(number_of_workspaces)
    if len(workspaces) > 0:
        current_app.logger.info("workspaces are created")
    else:
        current_app.logger.info("cannot create any workspace")
        workspaces = None
    return workspaces

# find workspaces by status. pending, starting, running, stopping, failed, canceling, canceled, deleting, deleted
def find_by_status(target_status):
    workspaces = list_workspaces('a')
    new_workspaces = []
    for workspace in workspaces:
        status = workspace['latest_build']['status']
        if status == target_status:
            new_workspaces.append(workspace)

    return new_workspaces

# workspace deletion related functions start
def delete_workspace(workspace):
    workspace_name = workspace['name']
    owner_name = workspace['owner_name']

    command = 'coder delete ' + owner_name + '/' + workspace_name + ' -y'
    result = subprocess.run([command], shell=True,
                            capture_output=True, text=True)
    current_app.logger.debug(workspace_name + ': ' + result.stdout)
    r_code = result.returncode
    if r_code == 0:
        return True
    else:
        return False

def delete_workspaces(workspaces):
    new_workspaces = []
    for workspace in workspaces:
        workspace_name = workspace['name']
        if delete_workspace(workspace):
            current_app.logger.info('deleted workspace %s', workspace_name)
            new_workspaces.append(workspace)
        else:
            current_app.logger.info('failed to delete workspace %s', workspace_name)
    if len(new_workspaces) == len(workspaces):
        current_app.logger.info('deleted all workspaces')
        return True
    else:
        return False


# update workspace' name, if it is older than workspace_age (hours)
def update_old_workspaces(workspace_age):
    if isinstance(workspace_age, int) == False:
        workspace_age = int(workspace_age)
    names = {'old_names': [], 'new_names': []}
    workspaces = list_workspaces('a')
    regex = r'^\d{14}'
    for workspace in workspaces:
        need_update = False
        old_name = workspace['name']

        if re.match(regex, old_name):
            difference = datetime.now() - datetime.strptime(old_name, '%Y%m%d%H%M%S')
            current_app.logger.debug('difference= %s', difference)
            if difference.total_seconds()/3600 > workspace_age:
                need_update = True
        else:
            need_update = True

        if need_update:
            current_app.logger.debug('workspace= %s', workspace)
            current_app.logger.debug('old_name= %s', old_name)
            names['old_names'].append(old_name)
            workspace = update_workspace(workspace)
            current_app.logger.debug('new_name= %s', workspace['name'])
            names['new_names'].append(workspace['name'])
            # time.sleep(0.5)
    return names

# this function is now used.
def create_token(user_id):
    # The token expiry duration for browser sessions. Default 24 hours
    # Sessions may last longer if they are actively making requests,
    # but this functionality can be disabled via --disable-session-expiry-refresh.
    token_url = 'http://localhost:3000/api/v2/users/a/keys'
    token_response = requests.post(token_url, headers=token_header)
    s_code = token_response.status_code
    app.logger.debug('token response status code:' +
                     str(token_response.status_code))
    if s_code == 201:
        token_json = token_response.json()
        app.logger.info(user_id + ': a new token is created')
        app.logger.debug(user_id + ': '+token_json['key'])
        return token_json['key']
    else:
        return ''