import json
import time
import praw
import requests


class SlackError(Exception):
    # This isn't quite how I would handle this, so for now it's
    # just a hint of more to learn.
    pass

    #  http://praw.readthedocs.io/en/latest/getting_started/authentication.html
reddit = praw.Reddit(client_id='xxxxxxxxx',
			 client_secret='xxxxxxxxxxxxxxxxxxx',
			 username='username',
			 password='password',
			 user_agent='python3:KeyWordNotify:v1 (/u/user)')
print(reddit.user.me())


MSG_TEMPLATE = """Keyword *{keyword}* detected
https://www.reddit.com{permalink}
```{comment_body}```"""

SLACK_WEBHOOK = 'https://hooks.slack.com/services/TB7AH6U2G/xxxxxxx/xxxxxxxxxxxx'



def send_message(comment, keywords, colors):
        assert keywords and colors, "At this point, we should *only* be calling this function if we have at least one keyword and one color"

MSG_TEMPLATE = """Keyword *{keyword}* and color *{color}* detected
    https://www.reddit.com{permalink}
    ```{comment_body}```"""
msg = MSG_TEMPLATE.format(
        keyword=keywords[0],
        color=colors[0],
        permalink=comment.permalink,
        comment_body=comment.body
    )
slack_data = {'text': msg, 'mrkdwn': True,}
response = requests.post('https://hooks.slack.com/services/TB7AH6U2G/xxxxxxx/xxxxxxxxxxxx',
                             data=json.dumps(slack_data), headers={'Content-Type': 'application/json'})


def should_be_ignored(comment, alerted):
    return comment.id in alerted or (comment.author and comment.author.name in ignore_users)


def find_keywords(comment, word_list):
    """:returns: List of matching keywords present in the comment, or the empty list"""
    return [word for word in word_list if word.lower() in comment.body.lower()]


keywords = ['camera', 'nikon', 'canon']
color_keywords = ['blue', 'red']
subreddit = reddit.subreddit('Cameras+Photography+test')
ignore_users = ['baduser1', 'baduser2', 'baduser3']  # case SENSITIVE

with open(save_path, 'r') as fp:
    alerted_comments = json.load(fp)

for comment in comment_stream:
    if not should_be_ignored(comment, alerted_comments):
        found_kws = find_keywords(comment, keywords)
        found_colors = find_keywords(comment, color_keywords)

        if found_kws and found_colors:
            # At this point, we're guaranteed to have *both* one or more keywords *and* one or more colors
            send_message(comment, found_kws, found_colors)




            if response.status_code == 200:
                # Moving this here so you don't miss a comment
                # because of an error. It does mean other errors
                # could potentially cause a repeat message. There
                # are ways to handle that.

                alerted_comments.append(comment.id)

                if len(alerted_comments) > 100:
                    alerted_comments = alerted_comments[-100:]

                with open(save_path, 'w') as fp:
                    json.dump(alerted_comments, fp)
            else:
                # You'll probably want to be more discerning than "not 200",
                # but that's fine for now.
                raise SlackError(
                    'Request to Slack returned an error %s, the response is:\n%s' % (
                        response.status_code, response.text))

if __name__ == '__main__':
    while True:
        try:
            main(save_path='alerted_comments.json')
        except Exception as e:
            print('There was an error: {}'.format(str(e)))
            time.sleep(60)  # wait for 60 seconds before restarting