#!/usr/bin/env python3

import database
import argparse
import sys
import ctypes
import json

ACCEL = ctypes.cdll.LoadLibrary('./libaccel.so')
ACCEL_NAME_BUF = ctypes.create_string_buffer(b'Z'*255, 255)
ACCEL_VALUE_BUF = ctypes.create_string_buffer(b'Z'*255, 255)

FUNCTION_MAP = {
    b'a': database.feed_a,
    b'cname': database.feed_cname,
}

if __name__ == '__main__':

    # Parsing arguments
    parser = argparse.ArgumentParser(
        description="TODO")
    parser.add_argument(
        '-i', '--input', type=argparse.FileType('rb'), default=sys.stdin.buffer,
        help="TODO")
    args = parser.parse_args()

    database.open_db()

    line = b'(none)'

    def err(name: bytes, value: bytes) -> None:
        print(f"Error with line: {line!r}")

    FUNCTIONS = [err, database.feed_cname, database.feed_a]

    try:
        database.time_step('iowait')
        for line in args.input:
            database.time_step('feed_json_parse')
            dtype = ACCEL.feed_dns_parse_json(
                ctypes.c_char_p(line),
                ACCEL_NAME_BUF,
                ACCEL_VALUE_BUF
            )
            database.time_step('feed_switch')
            FUNCTIONS[dtype](ACCEL_NAME_BUF.value, ACCEL_VALUE_BUF.value)
            database.time_step('iowait')
    except KeyboardInterrupt:
        print("Interupted.")
        pass

    database.close_db()