import logging
import os
import sys
import textwrap
from pathlib import Path

log = logging.getLogger("install")


def install():
    try:
        if sys.platform == 'win32' or sys.platform == 'cygwin':
            _windows_set_icon()
        else:
            if _is_executable():
                _linux_install_desktop_file()
                _linux_install_icon()
    except:
        log.exception("failed to install system stuff")


def _is_executable() -> bool:
    """
    Checks if we run from an executable (as opposed to from source by calling 'python krowlog.py')
    :return: True if this process is run from a distribution binary
    """
    return Path(sys.executable).name == 'krowlog'


def _linux_install_desktop_file():
    apps_dir = Path.home() / ".local" / "share" / "applications"
    if apps_dir.exists() and apps_dir.is_dir():
        krowlog_desktop_file = apps_dir / "krowlog.desktop"
        if not krowlog_desktop_file.exists():
            desktop_file_data = textwrap.dedent("""\
            [Desktop Entry]
            Type=Application
            Version=1.5
            Terminal=false
            Name=KrowLog
            GenericName=Log Viewer
            Comment=A viewer for text files of arbitrary size.
            Comment[de]=Betrachter für Textdateien beliebiger Größe.
            Categories=Qt;Development;Utility;TextTools;IDE;Viewer;
            Keywords=Text;Viewer;
            MimeType=text/plain;text/x-log;
            Icon=krowlog
            Exec={binary} %F
            """.format(binary=Path(sys.executable).resolve()))
            krowlog_desktop_file.write_text(desktop_file_data, "utf8")


def _linux_install_icon():
    local_share = Path.home().joinpath(".local").joinpath("share")
    if local_share.is_dir():
        icon_dir = local_share / "icons" / "hicolor" / "scalable" / "apps"
        _linux_install_icon_to_path(icon_dir / "krowlog.svg")


def _linux_install_icon_to_path(path: Path):
    if path.exists():
        return

    if not path.parent.exists():
        path.parent.mkdir(parents=True, exist_ok=True)

    svg = textwrap.dedent("""\
    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <svg width="64" height="64" viewBox="0 0 128 128" version="1.1" xmlns="http://www.w3.org/2000/svg">
        <defs>
            <linearGradient id="bg1" x1="0%" y1="100%" x2="100%" y2="0%">
                <stop offset="0%" style="stop-color:#9f8700"/>
                <stop offset="100%" style="stop-color:#ffdb00"/>
            </linearGradient>
            <linearGradient id="fg1" x1="0%" y1="100%" x2="100%" y2="0%">
                <stop offset="0%" style="stop-color:#8caec7"/>
                <stop offset="100%" style="stop-color:#6289a3"/>
            </linearGradient>
        </defs>
        <rect x="8" y="8" width="112" height="112" style="fill:url(#fg1)" rx="10"/>
        <path style="fill:black"
              d="M76,113
        L15,113
        L15,70
        C15,70 25,55 45,36
        C53,29 60,26 78,32
        C85,34 90,32 90,32
        C95,30 108,35 110,40
        L110,40
        C83,48 80,60 76,71
        C74,80 76,113 76,113
        z"/>
        <rect x="8" y="8" width="112" height="112"
              style="fill:none; stroke:url(#bg1); stroke-width:14" rx="10"/>
        <circle cx="63" cy="43" r="4.5" fill="white"/>
    </svg>""")
    path.write_text(svg, "utf8")
    pass


def _windows_set_icon():
    # make icon appear in Windows
    # see https://stackoverflow.com/questions/1551605/how-to-set-applications-taskbar-icon-in-windows-7/1552105#1552105
    if sys.platform == 'win32' or sys.platform == 'cygwin':
        myappid = 'krowlog'  # arbitrary string
        import ctypes
        ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(myappid)