#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import time
import optparse
from rq import use_redis, Queue, Worker
from rq.utils import gettermsize, make_colorizer

red = make_colorizer('darkred')
green = make_colorizer('darkgreen')
yellow = make_colorizer('darkyellow')


def pad(s, pad_to_length):
    """Pads the given string to the given length."""
    return ('%-' + '%ds' % pad_to_length) % (s,)

def get_scale(x):
    """Finds the lowest scale where x <= scale."""
    scales = [20, 50, 100, 200, 400, 600, 800, 1000]
    for scale in scales:
        if x <= scale:
            return scale
    return x


def parse_args():
    parser = optparse.OptionParser()
    parser.add_option('-q', '--queues', dest='subcmd',
            action='store_const', const='queues',
            help='Shows stats for queues.')
    parser.add_option('-w', '--workers', dest='subcmd',
            action='store_const', const='workers',
            help='Shows stats for workers.')
    parser.add_option('-n', '--interval', dest='interval',
            type='float',
            help='The interval between polls, in seconds.  Does not poll if 0.')
    parser.add_option('-g', '--graph', dest='graph',
            action='store_true', default=False,
            help='Shows bar chart graphs where possible.')
    parser.add_option('-Q', '--by-queue', dest='by_queue',
            default=False, action='store_true',
            help='Shows workers by queue.')
    opts, args = parser.parse_args()
    return (opts, args, parser)

def show_queues(opts, args, parser):
    while True:
        if len(args):
            qs = map(Queue, args)
        else:
            qs = Queue.all()

        num_jobs = 0
        termwidth, _ = gettermsize()
        chartwidth = min(20, termwidth - 20)

        max_count = 0
        counts = dict()
        for q in qs:
            count = q.count
            counts[q] = count
            max_count = max(max_count, count)
        scale = get_scale(max_count)
        ratio = chartwidth * 1.0 / scale

        if opts.interval:
            os.system('clear')

        print('scale = %d' % scale)
        for q in qs:
            count = counts[q]
            if opts.graph:
                chart = green('|' + '█' * int(ratio * count))
                line = '%-12s %s %d' % (q.name, chart, count)
            else:
                line = '%-12s %d' % (q.name, count)
            print(line)

            num_jobs += count
        print('%d queues, %d jobs total' % (len(qs), num_jobs))

        if opts.interval:
            time.sleep(opts.interval)
        else:
            break

def state_symbol(state):
    symbols = {
        'busy': red(u'\u25CF'),
        'idle': green(u'\u25CB'),
    }
    try:
        return symbols[state]
    except KeyError:
        return state

def show_workers(opts, args, parser):
    while True:
        qs = Queue.all()
        ws = Worker.all()

        if opts.interval:
            os.system('clear')

        queues = {qname: [] for qname in qs}
        for w in ws:
            for q in w.queues:
                if not q in queues:
                    queues[q] = []
                queues[q].append(w)

        if opts.by_queue:
            max_qname = max(map(lambda q: len(q.name), queues.keys()))
            for q in queues:
                if queues[q]:
                    queues_str = ", ".join(sorted(map(lambda w: '%s (%s)' % (w.name, state_symbol(w.state)), queues[q])))
                else:
                    queues_str = '–'
                print '%s %s' % (pad(q.name + ':', max_qname + 1), queues_str)
        else:
            for w in ws:
                print '%s %s: %s' % (w.name, state_symbol(w.state), ', '.join(w.queue_names()))
        print '%d workers, %d queues' % (len(ws), len(queues))

        if opts.interval:
            time.sleep(opts.interval)
        else:
            break


def main():
    opts, args, parser = parse_args()

    if not opts.subcmd:
        parser.error('Specify either --queues or --workers.')

    use_redis()

    if opts.subcmd == 'workers':
        show_workers(opts, args, parser)
    elif opts.subcmd == 'queues':
        show_queues(opts, args, parser)


if __name__ == '__main__':
    main()