#!/usr/bin/env python

import os
import sys
import time
import glob
import pkgutil
import argparse
import textwrap
import importlib
import bumblebee.theme
import bumblebee.modules
import bumblebee.outputs.i3

def print_module_list():
    print "available modules:"
    path = os.path.dirname(bumblebee.modules.__file__)
    for mod in [ name for _, name, _ in pkgutil.iter_modules([path])]:
        m = importlib.import_module("bumblebee.modules.{}".format(mod))

        desc = "n/a" if not hasattr(m, "description") else getattr(m, "description")()
        usage = "n/a" if not hasattr(m, "usage") else getattr(m, "usage")()
        notes = "n/a" if not hasattr(m, "notes") else getattr(m, "notes")()

        print "    {}: ".format(mod)
        print textwrap.fill("Description: {}".format(desc),
            80, initial_indent="        ", subsequent_indent="                     ")
        print textwrap.fill("Usage      : {}".format(usage),
            80, initial_indent="        ", subsequent_indent="                     ")
        print textwrap.fill("Notes      : {}".format(notes),
            80, initial_indent="        ", subsequent_indent="                     ")
        print ""

def print_theme_list():
    d = bumblebee.theme.getpath()

    print "available themes:"
    print textwrap.fill(", ".join(
        [ os.path.basename(f).replace(".json", "") for f in glob.iglob("{}/*.json".format(d)) ]),
        80, initial_indent = "    ", subsequent_indent = "    "
    )

def main():
    parser = argparse.ArgumentParser(description="display system data in the i3bar")
    parser.add_argument("-m", "--modules", nargs="+", help="List of modules to load. The order of the list determines their order in the i3bar (from left to right)")
    parser.add_argument("-e", "--events", nargs="+", help="List of click events that should be handled. Format is: <module name><splitter, see -s><button ID><splitter><command to execute>")
    parser.add_argument("-l", "--list", action="store_true", help="List all available modules and themes")
    parser.add_argument("-t", "--theme", help="Specify which theme to use for drawing the modules")
    parser.add_argument("-i", "--interval", help="Specify the update interval", default=1, type=int)
    parser.add_argument("-s", "--split", help="Specify string to use for splitting modules and their arguments", default="::")

    if len(sys.argv) == 1:
        parser.print_help()
        parser.exit()

    args = parser.parse_args()

    if args.list:
        print_module_list()
        print_theme_list()
        sys.exit(0)

    modules = []
    s = args.split
    for m in args.modules:
        # TODO: how to cleanly handle errors here?
        # (useful error messages)
        module_name = m if not s in m else m.split(s)[0]
        module_args = None if not s in m else m.split(s)[1:]
        module = importlib.import_module("bumblebee.modules.{}".format(module_name))
        modules.append(getattr(module, "Module")(module_args))

    theme = bumblebee.theme.Theme(args.theme) if args.theme else bumblebee.theme.Theme()
    output = bumblebee.outputs.i3.i3bar(theme)

    for e in args.events:
        ev = e.split(s)
        if len(ev) < 3:
            sys.stderr.write("invalid format for click event, expect 3 parameters")
            continue
        output.add_callback(
            module=ev[0],
            button=int(ev[1]),
            cmd=ev[2],
        )

    print output.start()
    sys.stdout.flush()

    while True:
        theme.reset()
        for m in modules:
            output.add(m)
            theme.next()
        print output.get()
        sys.stdout.flush()
        time.sleep(args.interval)

    print output.stop()

if __name__ == "__main__":
    main()

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