"""
Get instantaneous memory statistics (installed, total, free, available)
"""

import re

from logparse.formatting import *
from logparse import config
from logparse.load_parsers import Parser

class Mem(Parser):

    def __init__(self):
        super().__init__()
        self.name = "mem"
        self.info = "Get instantaneous memory statistics "
                "(installed, total, free, available)"

    def parse_log(self):

        logger.debug("Starting memory section")
        section = Section("memory")
        
        table = Table()

        ram_b = os.sysconf('SC_PAGE_SIZE') * os.sysconf('SC_PHYS_PAGES')
        table.add_row(Row([Column("Installed"), Column(parsesize(ram_b))]))

        raw_mem = util.readlog(config.prefs.get("logs", "meminfo"))
        line_regex = re.compile("^Mem(\w+):\s*(\d*)\s*kB$")

        for line in raw_mem.splitlines():

            matches = line_regex.findall(line)

            if len(matches) > 0:
                logger.debug("Detected {0} memory of {1} kB".
                        format(matches[0][0].lower(), matches[0][1]))
                table.add_row(Row([Column(matches[0][0]), 
                    Column(parsesize(float(matches[0][1])*1000))]))

        table.align_column(0, "right")
        section.append_table(table)

        logger.info("Finished memory section")
        return section