#!/usr/bin/env python3
"""
tools/manual/build_manual.py: setzt das Handbuch zusammen (Kapitel aus tools/manual/handbuch/ch*.html + Bilder).

  python build_manual.py <Bilder-Web> <Bilder-Windows> <Ausgabeordner> [Seitenzahlen.json]

Erzeugt <Ausgabeordner>/handbuch.html (und img/). Die PDF-Datei entsteht danach mit print_pdf.js (Electron).
Kapitel-Dateien nutzen:  <h1>, <h2>, <h3>  (Nummern und Inhaltsverzeichnis entstehen automatisch)
                         <fig n="bildname">Bildunterschrift</fig>   (Bild aus den Ordnern der Aufnahmen)
                         <div class="tip|warn|note">…</div>, <table>, <kbd>
"""
import html
import io
import json
import os
import re
import sys

from PIL import Image

here = os.path.dirname(os.path.abspath(__file__))
web_dir, win_dir, out_dir = sys.argv[1], sys.argv[2], sys.argv[3]
pages = {}
if len(sys.argv) > 4 and os.path.exists(sys.argv[4]):
    pages = json.load(io.open(sys.argv[4], encoding='utf-8'))
img_out = os.path.join(out_dir, 'img')
os.makedirs(img_out, exist_ok=True)

VERSION = 'Server 1.1.0 · Windows-Programm 2.12.3 · Android-App 3.5.3 · Chrome-Erweiterung 2.1.1 · WordPress-Plugin 1.3.0 · Minecraft-Plugin 1.2.0'
used = set()
missing = []
fig_no = [0]


def prep_image(name):
    """Bild kopieren (als JPEG, zu hohe Bilder werden unten abgeschnitten)."""
    src = os.path.join(win_dir if name.startswith('windows-') else web_dir, name + '.png')
    if not os.path.exists(src):
        missing.append(name)
        return None
    dst = os.path.join(img_out, name + '.jpg')
    if not os.path.exists(dst) or os.path.getmtime(dst) < os.path.getmtime(src):
        im = Image.open(src).convert('RGB')
        if im.height > 1650 and im.width > 300:
            im = im.crop((0, 0, im.width, 1650))
        im.save(dst, 'JPEG', quality=86, optimize=True)
    used.add(name)
    return 'img/' + name + '.jpg'


def fig_sub(m):
    name, cap = m.group(1), m.group(2).strip()
    path = prep_image(name)
    if not path:
        return '<div class="warn">[Bild fehlt: %s]</div>' % html.escape(name)
    fig_no[0] += 1
    narrow = ' narrow' if Image.open(os.path.join(img_out, name + '.jpg')).width < 500 else ''
    return ('<figure class="%s"><img src="%s" alt=""><figcaption><b>Abbildung %d:</b> %s</figcaption></figure>'
            % (narrow.strip(), path, fig_no[0], cap))


chapters = []
for fn in sorted(os.listdir(os.path.join(here, 'handbuch'))):
    if fn.startswith('ch') and fn.endswith('.html'):
        chapters.append(io.open(os.path.join(here, 'handbuch', fn), encoding='utf-8').read())
body = '\n'.join(chapters)
body = re.sub(r'<fig n="([^"]+)">(.*?)</fig>', fig_sub, body, flags=re.S)

# Nummerieren, Anker und Inhaltsverzeichnis
toc = []
c1 = [0]
c2 = [0]


def head_sub(m):
    lvl, text = int(m.group(1)), m.group(2).strip()
    if lvl == 1:
        c1[0] += 1
        c2[0] = 0
        num = str(c1[0])
    elif lvl == 2:
        c2[0] += 1
        num = '%d.%d' % (c1[0], c2[0])
    else:
        return '<h3>%s</h3>' % text
    anchor = 'k' + num.replace('.', '_')
    plain = html.unescape(re.sub(r'<[^>]+>', '', text))
    toc.append((lvl, num, plain, anchor))
    return '<h%d id="%s"><span class="num">%s</span> %s</h%d>' % (lvl, anchor, num, text, lvl)


body = re.sub(r'<h([12])>(.*?)</h\1>', head_sub, body, flags=re.S)

toc_html = ['<div class="toc"><h1 class="plain">Inhaltsverzeichnis</h1>']
for lvl, num, plain, anchor in toc:
    p = pages.get(anchor, '')
    toc_html.append('<a class="t%d" href="#%s"><span class="tn">%s</span><span class="tt">%s</span><span class="tl"></span><span class="tp">%s</span></a>'
                    % (lvl, anchor, num, html.escape(plain), p))
toc_html.append('</div>')

css = io.open(os.path.join(here, 'handbuch', 'manual.css'), encoding='utf-8').read()
cover = io.open(os.path.join(here, 'handbuch', 'cover.html'), encoding='utf-8').read().replace('{{VERSION}}', VERSION)
front = io.open(os.path.join(here, 'handbuch', 'front.html'), encoding='utf-8').read()
doc = ('<!doctype html><html lang="de"><head><meta charset="utf-8"><title>DeskHub Handbuch</title><style>%s</style></head><body>'
       '%s%s%s<main>%s</main></body></html>') % (css, cover, front, '\n'.join(toc_html), body)
io.open(os.path.join(out_dir, 'handbuch.html'), 'w', encoding='utf-8').write(doc)
io.open(os.path.join(out_dir, 'cover.html'), 'w', encoding='utf-8').write('<!doctype html><html lang="de"><head><meta charset="utf-8"><style>%s</style></head><body>%s</body></html>' % (css, cover))
json.dump([{'level': l, 'num': n, 'title': t, 'anchor': a} for l, n, t, a in toc], io.open(os.path.join(out_dir, 'toc.json'), 'w', encoding='utf-8'), ensure_ascii=False)
print('Kapitel/Abschnitte: %d, Abbildungen: %d, verwendete Bilder: %d, fehlend: %s' % (len(toc), fig_no[0], len(used), missing or 'keine'))