from flask import Flask, request
import os
import incident
import datetime
import subprocess
import re


def strip_ansi( text, escape = re.compile( r'\x1B\[[0-?]*[ -/]*[@-~]' ) ):
    return escape.sub( '', text )

def strip_progress( text, escape = re.compile( r'\r[^\n]*\n' ) ):
    return escape.sub( '', text )


app = Flask( __name__ )
app.config.from_envvar( 'FIH_SETTINGS' )

app.mm = incident.Mattermost( url = app.config[ 'MATTERMOST_URL' ],
                              port = app.config[ 'MATTERMOST_PORT' ],
                              login_id = app.config[ 'MATTERMOST_USER_EMAIL' ],
                              password = app.config[ 'MATTERMOST_USER_PASSWORD' ],
                              ).mm

@app.route( '/mattermost/incident', methods = [ 'POST' ] )
def mattermost_incident():
    # channel_name: testing
    # command: /incident
    # channel_id: o3ob1utim3nummoswjyt4174mo
    # user_name: marek
    # test_domain: faelix
    # text: test
    # team_id: 3woo8mbjrbb1in53xwdzi4ynqh
    # user_id: ko3uxmend7ne8ger4uw9mxkt1o
    # token: XXXXXXXXXXXXXXXXXXXXXXXXXX

    if request.form[ 'token' ] in app.config[ 'MATTERMOST_COMMAND_TOKENS' ]:
        incident_number = incident.generate_incident_number()
        fi_number = "FI#" + incident_number
        channel_name = "incident" + incident_number
        purpose = request.form[ 'text' ]

        channel = app.mm.channels.create_channel( options = { "team_id": request.form[ 'team_id' ],
                                                              "name": channel_name,
                                                              "display_name": fi_number,
                                                              "purpose": purpose,
                                                              "header": "",
                                                              "type": "O",
                                                              } )

        # add user to the channel we just created
        app.mm.client.make_request( 'post', '/channels/' + channel[ 'id' ] + '/members', options = { 'user_id': request.form[ 'user_id' ],
                                                                                                     } )
        app.mm.posts.create_post( options = { 'channel_id': channel[ 'id' ],
                                              'message': "Incident discussion channel for [%s](https://status.faelix.net/incident/%s) created by @%s." % ( fi_number, incident_number, request.form[ 'user_name' ] ),
                                              } )

        now = datetime.datetime.utcnow().strftime( "%Y-%m-%dT%H:%M:%S" )

        app.mm.posts.create_post( options = { 'channel_id': channel[ 'id' ],
                                              'message': """\
# Incident Response Communication Procedure

The contents of this channel are strictly confidential.

## Public Announcement

1. adjust the name of the incident with **/purpose**
2. adjust the description of the incident with **/header**
3. choose a front page status (see below)
4. publish https://status.faelix.net/incident/%(incident_number)s with **@FIH PUBLISH**

## Status Updates

* add an update: **@FIH TIMELINE** _text_
* set the incident start: **@FIH START** _%(now)s_ (UTC)
* set the incident ETR: **@FIH ETR** _%(now)s_ (UTC)
* set the incident resolved time: **@FIH RESOLVED** _%(now)s_ (UTC)
* set the incident finished time: **@FIH CLOSED** _%(now)s_ (UTC)

Again, don't forget to **@FIH PUBLISH** once making changes.

## Front Page Status

* **@FIH INCIDENT**
* **@FIH DEGRADED**
* **@FIH MAINTENANCE**
* **@FIH NOTICE**
* **@FIH OK**

Again, after setting the headline status you must: **@FIH PUBLISH**

## Good luck, Incident Commander @%(commander_name)s!""" % { "incident_number": incident_number,
                                                             "commander_name": request.form[ 'user_name' ],
                                                             "now": now,
                                                             },
                                              } )

        app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                              'message': 'On behalf of @%s I have started incident ~%s.' % ( request.form[ 'user_name' ], channel_name, ),
                                              } )

        return ""
    else:
        return "Invalid command token."


def exec_to_message( cmdline ):
    results = "`" + cmdline + "`:\n\n"
    process = subprocess.Popen( cmdline, shell = True, cwd = app.config[ "STATUS_ROOT" ], stdout = subprocess.PIPE, stderr = subprocess.PIPE )

    stdout = strip_progress( strip_ansi( process.stdout.read().decode( 'ascii', 'ignore' ) ) )
    if stdout:
        results += "\n\n```\n" + stdout.replace( "```", "` ` `" ) + "```\n"
    stderr = strip_progress( strip_ansi( process.stderr.read().decode( 'ascii', 'ignore' ) ) )
    if stderr:
        results += "\n\n```\n" + stderr.replace( "```", "` ` `" ) + "```\n"
    if not stdout and not stderr:
        results += '_no output_\n'
    return results


@app.route( '/mattermost/fih', methods = [ 'POST' ] )
def mattermost_fih():
    # text: @FIH PUBLISH
    # file_ids:
    # user_name: marek
    # trigger_word: @FIH
    # channel_name: incident201806158693
    # timestamp: 1529100914
    # channel_id: zq61mk8ig7rmibtbyqf4babhfr
    # team_id: 3woo8mbjrbb1in53xwdzi4ynqh
    # token: nn54y4ozbtnzb8pri3c4gdhbce
    # user_id: ko3uxmend7ne8ger4uw9mxkt1o
    # team_domain: faelix
    # post_id: 8cxn8yeyepyczcfbazdsd1bonw

    if request.form[ 'token' ] in app.config[ 'MATTERMOST_WEBHOOK_TOKENS' ]:
        cmd = request.form[ 'text' ].strip().split()[ 1 ].upper()

        app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                              'message': "### Executing `" + cmd + "`...",
                                              } )

        if cmd == "PUBLISH":
            for pull_from in app.config[ "MERCURIAL_PUSH_TO" ]:
                cmdline = app.config[ "MERCURIAL_BIN" ] + " pull " + pull_from
                message = exec_to_message( cmdline )
                app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                                      'message': message,
                                                      } )

                cmdline = app.config[ "MERCURIAL_BIN" ] + " merge"
                message = exec_to_message( cmdline )
                app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                                      'message': message,
                                                      } )

                cmdline = app.config[ "MERCURIAL_BIN" ] + " commit -m 'merge from " + pull_from + "'"
                message = exec_to_message( cmdline )
                app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                                      'message': message,
                                                      } )
                
            for deploy_to in app.config[ "GROW_DEPLOY_TO" ]:
                cmdline = app.config[ "GROW_BIN" ] + " deploy -f " + deploy_to
                message = exec_to_message( cmdline )
                app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                                      'message': message,
                                                      } )

        elif cmd == "START":
            pass
        elif cmd == "ETR":
            pass
        elif cmd == "RESOLVED":
            pass
        elif cmd == "CLOSED":
            pass
        elif cmd == "TIMELINE":
            pass
        elif cmd == "INCIDENT":
            pass
        elif cmd == "DEGRADED":
            pass
        elif cmd == "MAINTENANCE":
            pass
        elif cmd == "NOTICE":
            pass
        elif cmd == "OK":
            pass
        else:
            return "WTF command?"

        app.mm.posts.create_post( options = { 'channel_id': request.form[ 'channel_id' ],
                                              'message': "### Finished `" + cmd + "`!",
                                              } )

        return "OK"
    else:
        return "Invalid command token."
    
@app.route( '/' )
def hello_world():
    return 'Hello, World!'