"""Saves screenshots of the web UI tabs in Pictures/web-ui/, with Microsoft Edge (or Chrome)
in headless mode.

    python tools/make_webui_screenshots.py [ESP32 address, default 10.1.1.198]

Each tab is opened by its address (http://<ESP32>/#settings); the page editor with
#pages/<page name>. Edge runs with its own temporary profile. Only the Python standard
library is used.
"""

import json
import os
import shutil
import subprocess
import sys
import tempfile
import urllib.parse
import urllib.request

ESP = 'http://' + (sys.argv[1] if len(sys.argv) > 1 else '10.1.1.198')
OUT = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), 'Pictures', 'web-ui')
BROWSERS = [
    r'C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe',
    r'C:\Program Files\Microsoft\Edge\Application\msedge.exe',
    r'C:\Program Files\Google\Chrome\Application\chrome.exe',
    'microsoft-edge', 'google-chrome', 'chromium',
]
WIDTH = 1000
# File name, address part, window height
SHOTS = [
    ('show', 'show', 2150),
    ('pages', 'pages/Weer', 3000), # the page list and the editor (tall: nothing has to scroll)
    ('schedule', 'schedule', 1150),
    ('stopwatch', 'stopwatch', 560),
    ('bitmaps', 'bitmaps', 1600),
    ('icons', 'icons', 1900),
    ('draw', 'draw', 820),
    ('settings', 'settings', 1550),
    ('home-assistant', 'ha', 780),
    ('system', 'system', 1080),
]


def browser():
    for b in BROWSERS:
        path = shutil.which(b) or (b if os.path.exists(b) else None)
        if path:
            return path
    sys.exit('No Edge or Chrome found')


def read_ha_values():
    """Reads the Home Assistant values of all pages, so the previews show them"""
    with urllib.request.urlopen(ESP + '/api/pages', timeout=20) as r:
        pages = json.loads(r.read())['pages']
    for entity in {(e['entity'], e.get('attribute', '')) for p in pages for e in p['page']['elements'] if e.get('entity')}:
        query = urllib.parse.urlencode({'entity': entity[0], 'attribute': entity[1]})
        try:
            urllib.request.urlopen(ESP + '/api/ha/value?' + query, timeout=10).read()
        except Exception:
            pass


def shoot(exe, profile, path, address, height):
    for attempt in range(3):
        try:
            subprocess.run([exe, '--headless=new', '--disable-gpu', '--hide-scrollbars', '--user-data-dir=' + profile,
                            '--window-size=%d,%d' % (WIDTH, height), '--virtual-time-budget=20000',
                            '--screenshot=' + path, address],
                           stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=90)
            return True
        except subprocess.TimeoutExpired:
            pass  # the browser hung: try again
    return False


def main():
    exe = browser()
    read_ha_values()
    os.makedirs(OUT, exist_ok=True)
    profile = tempfile.mkdtemp(prefix='flipdot-edge-')
    try:
        for name, hash_part, height in SHOTS:
            path = os.path.join(OUT, name + '.png')
            ok = shoot(exe, profile, path, ESP + '/#' + hash_part, height)
            print(name, os.path.getsize(path) if ok and os.path.exists(path) else 'failed')
    finally:
        shutil.rmtree(profile, ignore_errors=True)


if __name__ == '__main__':
    main()