#!/usr/bin/python

'''
ttbp: tilde town blogging platform
(also known as the feels engine)
a console-based blogging program developed for tilde.town
copyright (c) 2016 ~endorphant (endorphant@tilde.town)

ttbp.py:
the main console interface

GNU GPL BOILERPLATE:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

the complete codebase is available at:
https://github.com/modgethanc/ttbp
'''

import os
import random
import tempfile
import subprocess
import time
import json
from email.mime.text import MIMEText;

import core
import chatter
import inflect
import util

## system globals
SOURCE = os.path.join("/home", "endorphant", "projects", "ttbp", "bin")
LIVE = "http://tilde.town/~"
FEEDBACK = os.path.join("/home", "endorphant", "ttbp-mail")
FEEDBOX = "endorphant@tilde.town"
USERFILE = os.path.join("/home", "endorphant", "projects", "ttbp", "users.txt")
VERSION = "0.8.7"

p = inflect.engine()

## user globals
USER = os.path.basename(os.path.expanduser("~"))

PATH = os.path.join("/home", USER, ".ttbp")
PUBLIC = os.path.join("/home", USER, "public_html")
WWW = os.path.join(PATH, "www")
CONFIG = os.path.join(PATH, "config")
TTBPRC = os.path.join(CONFIG, "ttbprc")
DATA = os.path.join(PATH, "entries")
SETTINGS = {
        "editor": "none",
        "publish dir": False
    }

## ui globals
BANNER = util.attach_rainbow()+open(os.path.join(SOURCE, "config", "banner.txt")).read()+util.attach_reset()
SPACER = "\n"
INVALID = "please pick a number from the list of options!\n\n"
DUST = "sorry about the dust, but this part is still under construction. check back later!\n\n"
QUITS = ['exit', 'quit', 'q', 'x']
BACKS = ['back', 'b', 'q']
EJECT = "eject button fired! going home now."

## ref

EDITORS = ["vim", "vi", "emacs", "pico", "nano", "ed"]
SUBJECTS = ["help request", "bug report", "feature suggestion", "general comment"]

##

def redraw(leftover=""):
    '''
    screen clearing

    * clears the screen and reprints the banner, plus whatever leftover text to be hilights
    '''

    os.system("clear")
    print(BANNER)
    print(SPACER)
    if leftover:
        print("> "+leftover+"\n")

def start():
    '''
    main engine head

    * called on program start
    * calls config check
    * proceeds to main menu
    * handles ^c and ^d ejects
    '''

    redraw()
    print("""
if you don't want to be here at any point, press <ctrl-d> and it'll all go away.
just keep in mind that you might lose anything you've started here.\
""")

    try:
        print(check_init())
    except EOFError:
        print(stop())
        return

    ##
    redraw()

    while 1:
        try:
            print(main_menu())
        except EOFError:
            print(stop())
            break
        except KeyboardInterrupt:
            redraw(EJECT)
        else:
            break

def stop():
    '''
    closer

    * prints ending text
    '''

    return "\n\n\t"+chatter.say("bye")+"\n\n"

def check_init():
    '''
    user handler

    * checks for presence of ttbprc
    * checks for last run version
    '''

    global SETTINGS

    print("\n\n")
    if os.path.exists(os.path.join(os.path.expanduser("~"),".ttbp")):
        print(chatter.say("greet")+", "+USER+".\n")

        ## ttbprc validation
        while not os.path.isfile(TTBPRC):
            setup_handler()
        try:
            SETTINGS = json.load(open(TTBPRC))
        except ValueError:
            setup_handler()

        ## PATCH CHECK HERE
        if not updated():
            print(update_version())

        ## when ready, enter main program and load core engine
        raw_input("press <enter> to explore your feels.\n\n")
        core.load()

        return ""
    else:
        return init()

def init():
    '''
    new user creation

    * introduces user
    * calls setup functinos
    '''

    try:
        raw_input("""
i don't recognize you, stranger. let's make friends.

press <enter> to begin, or <ctrl-c> to get out of here.
        """)
    except KeyboardInterrupt:
        print("\n\nthanks for checking in! i'll always be here.\n\n")
        quit()

    ## record user in source list
    users = open(USERFILE, 'a')
    users.write(USER+"\n")
    users.close()

    ## make .ttbp directory structure
    subprocess.call(["mkdir", PATH])
    subprocess.call(["mkdir", CONFIG])
    subprocess.call(["mkdir", DATA])

    ## create header file
    header = gen_header()
    headerfile = open(os.path.join(CONFIG, "header.txt"), 'w')
    for line in header:
        headerfile.write(line)
    headerfile.close()

    ## copy footer and default stylesheet
    subprocess.call(["cp", os.path.join(SOURCE, "config", "defaults", "footer.txt"), CONFIG])
    subprocess.call(["cp", os.path.join(SOURCE, "config", "defaults", "style.css"), CONFIG])

    ## run user-interactive setup and load core engine
    setup()
    core.load()

    raw_input("\nyou're all good to go, "+chatter.say("friend")+"! hit <enter> to continue.\n\n")
    return ""

def gen_header():
    '''
    header generator

    builds header to insert username
    '''

    header ="""
<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 3.2//EN\">
<html>
    <head>
        <!--- this header automatically generated by ttbp initialization on """+time.strftime("%Y-%m-%d %h:m")+""" --->
        <title>~"""+USER+""" on TTBP</title>
        <link rel=\"stylesheet\" href=\"style.css\" />
    </head>
    <body>
        <div id=\"meta\">
            <h1><a href=\"index.html#\">~"""+USER+"""</a>@<a href=\"/~endorphant/ttbp\">TTBP</a></h1>
        </div>

        <!---put your custom html here-->



        <!---don't put anything after this line-->
        <div id=\"tlogs\">\
    """
    return header

def setup_handler():
    '''
    setup wrapper function

    * calls setup()
    * handles ^c
    '''

    print("\nyour ttbp configuration doesn't look right. let's make you a fresh copy.\n\n")
    try:
        setup()
    except KeyboardInterrupt:
        print("\n\nsorry, trying again.\n\n")
        setup()

def setup():
    '''
    master setup function

    * editor selection
    * publishing toggle
    * publish/unpublish as needed
    * directory selection

    TODO: break this out better?
    '''

    global SETTINGS

    # editor selection
    SETTINGS.update({"editor": select_editor()})
    redraw("text editor set to: "+SETTINGS["editor"])

    # publishing selection
    SETTINGS.update({"publishing":select_publishing()})
    update_publishing()
    redraw("blog publishing: "+str(publishing()))

    if publishing():
        print("publish directory: ~"+USER+"/public_html/"+SETTINGS.get("publish dir"))

    # save settings
    ttbprc = open(TTBPRC, "w")
    ttbprc.write(json.dumps(SETTINGS, sort_keys=True, indent=2, separators=(',',':')))
    ttbprc.close()

    raw_input("\nyou're all good to go, "+chatter.say("friend")+"! hit <enter> to continue.\n\n")
    redraw()
    return SETTINGS

## menus

def print_menu(menu):
    '''
    pretty menu handler

    * takes list of options and prints them
    '''

    i = 0
    for x in menu:
        line = []
        line.append("\t[ ")
        if i < 10:
            line.append(" ")
        line.append(str(i)+" ] "+x)
        print("".join(line))
        i += 1

def main_menu():
    '''
    main navigation menu
    '''

    menuOptions = [
            "record your feels",
            "review your feels",
            "check out your neighbors",
            "browse global feels",
            "change your settings",
            "send some feedback",
            "see credits"]

    print("you're at ttbp home. remember, you can always press <ctrl-c> to come back here.\n\n")
    print_menu(menuOptions)

    try:
        choice = raw_input("\ntell me about your feels (or 'quit' to exit): ")
    except KeyboardInterrupt:
        redraw(EJECT)
        return main_menu()

    if choice == '0':
        redraw()
        today = time.strftime("%Y%m%d")
        write_entry(os.path.join(DATA, today+".txt"))
        www_neighbors(find_ttbps())
    elif choice == '1':
        redraw("here are your recorded feels, listed by date:\n")
        view_own()
    elif choice == '2':
        users = find_ttbps()
        redraw("the following "+p.no("user", len(users))+" "+p.plural("is", len(users))+" recording feels on ttbp:\n")
        view_neighbors(users)
    elif choice == '3':
        redraw("most recent global entries\n")
        view_feed()
    elif choice == '4':
        pretty_settings = "\n\n\ttext editor:\t" +SETTINGS.get("editor")
        if publishing():
            pretty_settings += "\n\tpublish dir:\t" +os.path.join(PUBLIC, SETTINGS.get("publish dir"))
        pretty_settings += "\n\tpubishing:\t"+str(SETTINGS.get("publishing"))

        redraw("now changing your settings. press <ctrl-c> if you didn't mean to do this."+pretty_settings+"\n")
        try:
            setup()
        except KeyboardInterrupt():
            redraw(EJECT)
        redraw()
    elif choice == '5':
        feedback_menu()
    elif choice == '6':
        redraw()
        show_credits()
    elif choice in QUITS:
        return stop()
    else:
        redraw(INVALID)

    return main_menu()

def feedback_menu():
    '''
    feedback handling menu

    * selects feedback type
    * calls feedback writing function
    '''

    print("you're about to send mail to ~endorphant about ttbp\n\n")

    print_menu(SUBJECTS)
    choice = raw_input("\npick a category for your feedback: ")

    cat = ""
    if choice in ['0', '1', '2', '3']:
        cat = SUBJECTS[int(choice)]
        entered = raw_input("""
composing a """+cat+""" to ~endorphant.

press <enter> to open an external text editor. mail will be sent once you save and quit.

""")
        redraw(send_feedback(entered, cat))
        return
    else:
        redraw(INVALID)

    return feedback_menu()

def view_neighbors(users):

    userList = []

    for user in users:
        userRC = json.load(open(os.path.join("/home", user, ".ttbp", "config", "ttbprc")))
        url="\t\t\t"
        if userRC.get("publish dir"):
            url = LIVE+user+"/"+userRC.get("publish dir")
        count = 0
        lastfile = ""
        files = os.listdir(os.path.join("/home", user, ".ttbp", "entries"))
        files.sort()
        for filename in files:
            if core.valid(filename):
                count += 1
                lastfile = os.path.join("/home", user, ".ttbp", "entries", filename)

        ago = "never"
        if lastfile:
            last = os.path.getctime(lastfile)
            since = time.time()-last
            ago = util.pretty_time(int(since)) + " ago"
        else:
            last = 0

        pad = ""
        if len(user) < 8:
            pad = "\t"
        user = "~"+user
        if len(user) < 8:
            user += "\t"

        userList.append(["\t"+user+"\t"+url+pad+"\t("+ago+")", last])

    # sort user by most recent entry
    userList.sort(key = lambda userdata:userdata[1])
    userList.reverse()
    sortedUsers = []
    for user in userList:
        sortedUsers.append(user[0])

    print_menu(sortedUsers)

    raw_input("\n\npress <enter> to go back home.\n\n")
    redraw()

    return

def view_own():

    filenames = []

    for entry in os.listdir(DATA):
        filenames.append(os.path.join(DATA, entry))
    metas = core.meta(filenames)

    entries = []
    for entry in metas:
        entries.append(""+entry[4]+" ("+p.no("word", entry[2])+") ")

    return view_entries(metas, entries, "here are your recorded feels, listed by date: \n\n")

def show_credits():

    print("""
ttbp was written by ~endorphant in python. the codebase is
publicly available on github at https://github.com/modgethanc/ttbp

for the full changelog, see ~endorphant/projects/ttbp/changelog.txt

if you have ideas for ttbp, you are welcome to fork the repo and
work on it. i'm only a neophyte dev, so i apologize for any
horrendously ugly coding habits i have. i'd love to hear about your
ideas and brainstorm about new features!

thanks to everyone who reads, listens, writes, and feels.\
        """)

    raw_input("\n\npress <enter> to go back home.\n\n")
    redraw()

    return


## handlers

def write_entry(entry=os.path.join(DATA, "test.txt")):

    entered = raw_input("""
"""+util.hilight("new feature!")+""" you can now use standard markdown in your entry text!
raw html is still valid, and you can mix them together.

feels will be recorded for today, """+time.strftime("%d %B %Y")+""".

if you've already started recording feels for this day, you
can pick up where you left off.

press <enter> to begin recording your feels.

""")

    if entered:
        entryFile = open(entry, "a")
        entryFile.write("\n"+entered+"\n")
        entryFile.close()
    subprocess.call([SETTINGS["editor"], entry])

    left = ""

    if publishing():
        core.load_files()
        core.write("index.html")
        left = "posted to "+LIVE+USER+"/"+SETTINGS["publish dir"]+"/index.html\n\n>"
    redraw(left + " thanks for sharing your feels!")

    return

def send_feedback(entered, subject="none"):

    message = ""

    temp = tempfile.NamedTemporaryFile()
    if entered:
        msgFile = open(temp.name, "a")
        msgFile.write(entered+"\n")
        msgFile.close()
    subprocess.call([SETTINGS["editor"], temp.name])
    message = open(temp.name, 'r').read()

    id = "#"+util.genID(3)
    mail = MIMEText(message)
    mail['To'] = FEEDBOX
    mail['From'] = USER+"@tilde.town"
    mail['Subject'] = " ".join(["[ttbp]", subject, id])
    m = os.popen("/usr/sbin/sendmail -t -oi", 'w')
    m.write(mail.as_string())
    m.close()

    return """\
thanks for writing! for your reference, it's been recorded
> as """+ " ".join([subject, id])+""". i'll try to respond to you soon.\
            """

def view_entries(metas, entries, prompt):

    print_menu(entries)

    choice = list_select(entries, "pick an entry from the list, or type 'back' to go home: ")

    if choice is not False:

        redraw("now reading ~"+metas[choice][5]+"'s feels on "+metas[choice][4]+"\n> press <q> to return to feels list.\n\n")

        show_entry(metas[choice][0])
        redraw(prompt)

        return view_entries(metas, entries, prompt)

    else:
        redraw()
        return

def show_entry(filename):

    subprocess.call(["less", filename])

    return

def view_feed():

    feedList = []

    for townie in find_ttbps():
        entryDir = os.path.join("/home", townie, ".ttbp", "entries")
        filenames = os.listdir(entryDir)

        for entry in filenames:
            if core.valid(entry):
                feedList.append(os.path.join(entryDir, entry))

    metas = core.meta(feedList)
    metas.sort(key = lambda entry:entry[3])
    metas.reverse()

    entries = []
    for entry in metas[0:10]:
        pad = ""
        if len(entry[5]) < 8:
            pad = "\t"

        entries.append("~"+entry[5]+pad+"\ton "+entry[3]+" ("+p.no("word", entry[2])+") ")

    #print_menu(entries)
    view_entries(metas, entries, "most recent global entries: \n\n")

    redraw()

    return

#####

def find_ttbps():
    # looks for users with a valid ttbp config and returns a list of them
    users = []

    for townie in os.listdir("/home"):
        if os.path.exists(os.path.join("/home", townie, ".ttbp", "config", "ttbprc")):
            users.append(townie)

    return users

def www_neighbors(users):
    # takes a raw list of valid users and formats for www view

    userList = []

    for user in users:
        if not publishing(user):
            continue

        userRC = json.load(open(os.path.join("/home", user, ".ttbp", "config", "ttbprc")))

        url = LIVE+user+"/"+userRC["publish dir"]

        lastfile = ""
        files = os.listdir(os.path.join("/home", user, ".ttbp", "entries"))
        files.sort()
        for filename in files:
            if core.valid(filename):
                lastfile = os.path.join("/home", user, ".ttbp", "entries", filename)

        if lastfile:
            last = os.path.getctime(lastfile)
            timestamp = time.strftime("%Y-%m-%d at %H:%M", time.localtime(last)) + time.strftime(" (%z)")
        else:
            timestamp = ""
            last = 0

        userList.append(["<a href=\""+url+"\">~"+user+"</a> "+timestamp, last])

    # sort user by most recent entry
    userList.sort(key = lambda userdata:userdata[1])
    userList.reverse()
    sortedUsers = []
    for user in userList:
        sortedUsers.append(user[0])

    core.write_global_feed(sortedUsers)

def list_select(options, prompt):
    # runs the prompt for the list until a valid index is imputted

    ans = ""
    invalid = True

    while invalid:
        choice = raw_input("\n\n"+prompt)

        if choice in BACKS:
            return False

        try:
            ans = int(choice)
        except ValueError:
            return list_select(options, prompt)

        invalid = False

    if ans >= len(options):
        return list_select(options, prompt)

    return ans

def input_yn(query):
    # returns boolean True or False

    try:
        ans = raw_input(query+" [y/n] ")
    except KeyboardInterrupt:
        input_yn(query)

    while ans not in ["y", "n"]:
        ans = raw_input("'y' or 'n' please: ")

    if ans == "y":
        return True
    else:
        return False

def publishing(username = USER):
    # checks .ttbprc for whether or not user wants their blog published online

    ttbprc = {}

    if username == USER:
        ttbprc = SETTINGS

    else:
        ttbprc = json.load(open(os.path.join("/home", username, ".ttbp", "config", "ttbprc")))

    return ttbprc.get("publishing")

def select_editor():
    # setup helper for editor selection

    print_menu(EDITORS)
    choice = raw_input("\npick your favorite text editor: ")
    while choice  not in ['0', '1', '2', '3', '4', '5']:
        choice = raw_input("\nplease pick a number from the list: ")

    return EDITORS[int(choice)]

def select_publish_dir():
    # setup helper for publish directory selection

    current = SETTINGS.get("publish dir")
    republish = False

    if current:
        print("\ncurrent publish dir:\t"+os.path.join(PUBLIC, SETTINGS["publish dir"]))
        republish = True

    choice = raw_input("\nwhere do you want your blog published? (leave blank to use default \"blog\") ")
    if not choice:
        choice = "blog"

    publishDir = os.path.join(PUBLIC, choice)
    while os.path.exists(publishDir):
        second = raw_input("\n"+publishDir+"""\
 already exists! 
 
setting this as your publishing directory means this program may
delete or overwrite file there!
 
if you're sure you want to use it, hit <enter> to confirm.
otherwise, pick another location: """) 
        
        if second == "":
            break
        choice = second
        publishDir = os.path.join(PUBLIC, choice)

    return choice

def select_publishing():
    # setup helper for toggling publishing

    publish = input_yn("""\
do you want to publish your feels online?

if yes, your feels will be published to a directory of your choice in
your public_html. i'll confirm the location of that directory in a
moment.

if not, your feels will only be readable from within the tilde.town
network. if you already have a publishing directory, i'll remove it for
you (don't worry, your written entries will still be saved!)

you can change this option any time.

please enter\
""")

    return publish

def unpublish():
    # remove user's published directory, if it exists

    dir = SETTINGS.get("publish dir")
    if dir:
        publishDir = os.path.join(PUBLIC, dir)
        subprocess.call(["rm", publishDir])
        #subprocess.call(["rm", WWW])

def update_publishing():
    # handler to update publishing directory, or wipe it

    global SETTINGS

    if publishing():
        oldDir = SETTINGS.get("publish dir")
        newDir = select_publish_dir()
        SETTINGS.update({"publish dir": newDir})
        if oldDir:
            subprocess.call(["rm", os.path.join(PUBLIC, oldDir)])
        make_publish_dir(newDir)
        core.load_files()
        core.write("index.html")
    else:
        unpublish()
        SETTINGS.update({"publish dir": None})

def make_publish_dir(dir):
    # setup helper to create publishing directory

    if not os.path.exists(WWW):
        subprocess.call(["mkdir", WWW])
        subprocess.call(["ln", "-s", os.path.join(CONFIG, "style.css"), os.path.join(WWW, "style.css")])
        subprocess.call(["touch", os.path.join(WWW, "index.html")])
        index = open(os.path.join(WWW, "index.html"), "w")
        index.write("<h1>ttbp blog placeholder</h1>")
        index.close()

    publishDir = os.path.join(PUBLIC, dir)
    if os.path.exists(publishDir):
        subprocess.call(["rm", publishDir])

    subprocess.call(["ln", "-s", WWW, publishDir])

    print("\n\tpublishing to "+LIVE+USER+"/"+SETTINGS.get("publish dir")+"/\n\n")

##### PATCHES

def updated():
    # checks to see if current user is up to the same version as system

    versionFile = os.path.join(PATH, "version")
    if not os.path.exists(versionFile):
            return False

    ver = open(versionFile, "r").read()

    if ver == VERSION:
        return True

    return False

def update_version():
    # updates user to current version

    global SETTINGS

    versionFile = os.path.join(PATH, "version")

    print("ttbp had some updates!")

    print("\ngive me a second to update you to version "+VERSION+"...\n")

    time.sleep(1)
    print("...")
    time.sleep(2)

    if not os.path.isfile(versionFile):
        # from 0.8.5 to 0.8.6:

        # change style.css location
        if os.path.isfile(os.path.join(WWW, "style.css")):
            subprocess.call(["mv", os.path.join(WWW, "style.css"), CONFIG])

        # change www symlink
        if os.path.exists(WWW):
            subprocess.call(["rm", WWW])
            subprocess.call(["mkdir", WWW])

        subprocess.call(["ln", "-s", os.path.join(CONFIG, "style.css"), os.path.join(WWW, "style.css")])

        publishDir = os.path.join(PUBLIC, SETTINGS.get("publish dir"))
        if os.path.exists(publishDir):
            subprocess.call(["rm", "-rf", publishDir])
            subprocess.call(["ln", "-s", WWW, os.path.join(PUBLIC, SETTINGS.get("publish dir"))])

        # repopulate html files
        core.load_files()
        core.write("index.html")

        # add publishing setting
        print("\nnew feature!\n")
        SETTINGS.update({"publishing":select_publishing()})
        update_publishing()
        ttbprc = open(TTBPRC, "w")
        ttbprc.write(json.dumps(SETTINGS, sort_keys=True, indent=2, separators=(',',':')))
        ttbprc.close()

    else: # version at least 0.8.6
        # from 0.8.6 to 0.8.7
        if open(versionFile, 'r').read() == "0.8.6":
            print("\nresetting your publishing settings...\n")
            SETTINGS.update({"publishing":select_publishing()})
            update_publishing()
            ttbprc = open(TTBPRC, "w")
            ttbprc.write(json.dumps(SETTINGS, sort_keys=True, indent=2, separators=(',',':')))
            ttbprc.close()


    # increment user versionfile
    open(versionFile, "w").write(VERSION)

    return "you're all good to go, "+chatter.say("friend")+"!\n"

#####

if __name__ == '__main__':
    start()