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#!/usr/bin/env python
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# A DiGIR client
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import os
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import os.path
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import sys
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import urllib
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import urllib2
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sys.path.append(os.path.dirname(__file__)+"/../lib")
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import dates
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import opts
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import streams
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import util
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# Config
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timeout = 20 # sec
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default_schema = 'http://digir.net/schema/conceptual/darwin/full/2003/1.0/darwin2full.xsd'
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request_xml_template = '''\
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<?xml version="1.0" encoding="UTF-8"?>
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<request
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    xmlns="http://digir.net/schema/protocol/2003/1.0"
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    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
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    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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    xmlns:digir="http://digir.net/schema/protocol/2003/1.0"
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    xmlns:darwin="http://digir.net/schema/conceptual/darwin/2003/1.0"
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    xmlns:dwc="http://digir.net/schema/conceptual/darwin/2003/1.0"
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    xsi:schemaLocation="http://digir.net/schema/protocol/2003/1.0
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      http://digir.sourceforge.net/schema/protocol/2003/1.0/digir.xsd
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      http://digir.net/schema/conceptual/darwin/2003/1.0
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      http://digir.sourceforge.net/schema/conceptual/darwin/2003/1.0/darwin2.xsd">
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    <header>
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        <version>1.0</version>
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        <sendTime>[time]</sendTime>
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        <source>[source]</source>
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        <destination resource="[resource]">[url]</destination>
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        <type>search</type>
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    </header>
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    <search>
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        <filter>
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            <equals>
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                <darwin:Kingdom>plantae</darwin:Kingdom>
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            </equals>
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        </filter>
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        <records limit="[count]" start="[start]">
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            <structure schemaLocation="[schema]"/>
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        </records>
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        <count>true</count>
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    </search>
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</request>
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'''
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def main():
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    env_names = []
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    def usage_err():
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        raise SystemExit('Usage: '+opts.env_usage(env_names, True)+' '
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            +sys.argv[0]+' 2>>log')
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    # Get config from env vars
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    url = opts.get_env_var('url', None, env_names)
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    resource = opts.get_env_var('resource', None, env_names)
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    schema = opts.get_env_var('schema', default_schema, env_names)
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    start = util.cast(int, opts.get_env_var('start', 0, env_names))
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    count = util.cast(int, opts.get_env_var('n', 1, env_names))
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    debug = opts.env_flag('debug', False, env_names)
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    if url == None or resource == None: usage_err()
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    def clear_line(): sys.stderr.write('\n')
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    log_indent = 0
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    def log(msg, line_ending='\n'):
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        sys.stderr.write(('    '*log_indent)+msg+line_ending)
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    self_dir = os.path.dirname(__file__)
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    source = os.popen(self_dir+"/local_ip").read().strip()
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    this_request_xml_template = (request_xml_template
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        .replace('[source]', source)
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        .replace('[url]', url)
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        .replace('[resource]', resource)
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        .replace('[schema]', schema)
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        .replace('[count]', str(count))
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        )
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    time = dates.strftime('%Y-%m-%d %H:%M:%S %Z', dates.now())
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    request_xml = (this_request_xml_template
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        .replace('[start]', str(start))
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        .replace('[time]', time)
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        )
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    if debug: sys.stderr.write(request_xml)
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    this_url = url+'?'+urllib.urlencode({'request': request_xml})
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    stream = streams.StreamIter(streams.TimeoutInputStream(
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        urllib2.urlopen(this_url), timeout))
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    try:
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        # Copy lines
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        for line in stream:
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            sys.stdout.write(line)
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    finally: # still run if break is called
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        stream.close()
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main()