#!/usr/bin/python
# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from __future__ import division
import os

root_dir = os.path.normpath(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

# using virtualenv's activate_this.py to reorder sys.path
activate_this = os.path.join(root_dir, 'bin', 'activate_this.py')
execfile(activate_this, dict(__file__=activate_this))

import Image
import ImageDraw
import json
from optparse import OptionParser
import ox
from ox.image import drawText, wrapText
import sys

static_root = os.path.join(os.path.dirname(__file__), 'data')

def render_poster(data, poster):
    title = ox.decode_html(data.get('title', ''))
    id = data['id']
    frame = data['frame']
    timeline = data['timeline']

    poster_width = 640
    poster_height = 1024
    poster_ratio = poster_width / poster_height
    poster_color = (255, 255, 0)
    poster_image = Image.new('RGB', (poster_width, poster_height))
    font_file = os.path.join(static_root, 'DejaVuSansCondensedBold.ttf')
    font_size = 48

    # timeline
    timeline_height = 64
    timeline_lines = 16
    if timeline:
        timeline_image = Image.open(timeline)
        timeline_image = timeline_image.resize((10240, timeline_height), Image.ANTIALIAS)
        for i in range(timeline_lines):
            line_image = timeline_image.crop((i * poster_width, 0, (i + 1) * poster_width, 64))
            poster_image.paste(line_image, (0, i * timeline_height))

    # id
    text = 'Pad.ma/' + id
    text_image = Image.new('RGB', (1, 1))
    text_size = drawText(text_image, (0, 0), text, font_file, font_size, poster_color)
    text_width = poster_width
    text_height = timeline_height
    text_left = int((poster_width - text_width) / 2)
    text_top = 14 * timeline_height
    for y in range(text_top, text_top + text_height):
        for x in range(text_left, text_left + text_width):
            if y < text_top + 4 or y >= text_top + text_height - 4: 
                poster_image.putpixel((x, y), poster_color)
            else:
                pixel = list(poster_image.getpixel((x, y)))
                for c in range(3):
                    pixel[c] = int((pixel[c] + poster_color[c]) / 4)
                poster_image.putpixel((x, y), tuple(pixel))
    drawText(poster_image, ((poster_width - text_size[0]) / 2, text_top + (text_height - text_size[1]) / 2), text, font_file, font_size, poster_color)
    poster_image.save(poster)

def main():
    parser = OptionParser()
    parser.add_option('-p', '--poster', dest='poster', help='Poster (image file to be written)')
    parser.add_option('-d', '--data', dest='data', help='json file with metadata', default=None)
    (options, args) = parser.parse_args()

    if None in (options.data, options.poster):
        parser.print_help()
        sys.exit()

    if options.data == '-':
        data = json.load(sys.stdin)
    else:
        with open(options.data) as f:
            data = json.load(f)
    render_poster(data, poster)

if __name__ == "__main__":
    main()