import sys

import subprocess

def make_post(num, timestamp, email, msg):
    # used <a class> for name and email but it's not actually needed.
    #     <a class=\"name\">%s</a>
    #     <a class=\"email\">(%s)</a>
    output = ""
    fmt  = ""
    part = '''
<div class=\"postcell\" id=\"%i\">
    <div class=\"timestamp\"><a href=#%i>%s</a></div>
    <div class=\"message\">%s</div>
'''
    if email != None: 
        fmt = part + "<div class=\"reply\"><a href=\"mailto:%s?subject=p%i\">[reply]</a></div></div>"
        output = fmt % (num, num, timestamp, msg, email, num)
    else:
        fmt += part + "</div>"
        output = fmt % (num, num, timestamp, msg)
    return output

def make_gallery(i, w):
    tag = []
    if i == []:
        return tag
    tag.append("<div class=\"gallery\">")
    for index in reversed(i):
        image = w.pop(index)
        template = '''
<div class=\"panel\">
    <a href=\"%s\"><img src=\"%s\" class=\"embed\"></img></a>
</div>
''' 
        tag.append(template % (image, image))
    tag.append("</div>")
    return tag

def markup(msg):
    result = 0
    tagged = ""
    words  = msg.split()
    # support multiple images (gallery style)
    images = [] # list of integers
    tags   = [] # list of strings
    for i in range(len(words)):
        word  = words[i]
        # don't help people click http
        if word.find("src=") == 0 or word.find("href=") == 0:
            continue
        elif word.find("https://") != -1: 
            new_word = ("<a href=\"%s\">%s</a>") % (word, word)
            words[i] = new_word
        elif word.find("#") != -1 and len(word) > 1:
            # split by unicode blank character if present
            w = word.split(chr(8206)) 
            # w[0] is the portion closest to the #
            tags.append(w[0])
            new_word = "<span class=\"hashtag\">%s</span>" % (w[0])
            if len(w) > 1:
                new_word += w[1]
            words[i] = new_word
        elif word.find(".jpg") != -1 or word.find(".png") != -1:
            images.append(i)
            # are .gifs and other media files too much bloat?
    gallery = make_gallery(images, words)
    words += gallery
    return " ".join(words), tags

def parse_txt(filename):
    content   = []
    with open(filename, 'r') as f:
        content = f.readlines()
    stack   = [] # stack of lists - only a stack b/c order of contents
    message = [] # queue of lines
    #  {-1 = init;; 0 = timestamp is next, 1 = message is next}
    state       = -1 
    timestamp   = ""
    for line in content:
       # print (line, len(line), state)
        if state == -1:
            state = 0
            continue
        elif state == 0:
            cmd      = ['date', '-d', line, '+%y %b %d']
            result    = subprocess.run(cmd, stdout=subprocess.PIPE)
            timestamp = result.stdout.decode('utf-8')
            state     = 1
        elif state == 1:
            if len(line) > 1:
                message.append(line)
            else:
                stack.append([timestamp, "<br>".join(message)])
                message = []
                state = 0 
    return stack

def make_timeline(filename, email=None):
    timeline  = []
    tagcloud  = dict()
    # note: content is ordered from newest to oldest
    # format requires two line breaks before EOF
    stack_of_posts = parse_txt(filename) # [timestamp, message]
    count = len(stack_of_posts)
    for post in stack_of_posts:
        p, t = markup(post[1])
        timeline.append(
            make_post(count, post[0], email, p)
        )
        count -= 1
        for tag in t:
            if tagcloud.get(tag) == None:
                tagcloud[tag] = 0
            tagcloud[tag] += 1
    return timeline, tagcloud
    pass

def make_tagcloud(d):
    sorted_d = {k: v for k, 
                v in sorted(d.items(), 
                key=lambda item: -item[1])}
    output = []
    fmt    = "<span class=\"hashtag\">%s(%i)</span>"
    for key in d.keys():
        output.append(fmt % (key, d[key]))
    return output

if __name__ == "__main__":
    def get_params():
        argc = len(sys.argv)
        if argc < 3:
            msg = '''This is microblog.py. (%s/3 parameters given; 4 maximum)
\tpython microblog.py [template] [content] [optional: email]
'''
            print(msg % argc)
        # script = argv[0]
        return argc

    def main():
        param_count = get_params()
        template = sys.argv[1]
        content = sys.argv[2]
        email = sys.argv[3] if (param_count >= 4) else None
        tl, tc = make_timeline(content, email)
        tcl    = make_tagcloud(tc)
        count  = len(tl)
        with open(template,'r') as f:
            html = f.read()
            print(html % (count, "\n".join(tcl), "\n\n".join(tl)))
    main()