/*
 Copyright (C) 2017 Fredrik Öhrström

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include"cmdline.h"
#include"meters.h"
#include"util.h"

using namespace std;

CommandLine *parseCommandLine(int argc, char **argv) {

    CommandLine * c = new CommandLine;

    int i=1;
    if (argc < 2) {
        c->need_help = true;
        return c;
    }
    while (argv[i] && argv[i][0] == '-') {
        if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "-help") || !strcmp(argv[i], "--help")) {
            c->need_help = true;
            return c;
        }
        if (!strcmp(argv[i], "--silence")) {
            c->silence = true;
            i++;
            continue;
        }
        if (!strcmp(argv[i], "--verbose")) {
            c->verbose = true;
            i++;
            continue;
        }
        if (!strcmp(argv[i], "--debug")) {
            c->debug = true;
            i++;
            continue;
        }
        if (!strcmp(argv[i], "--logtelegrams")) {
            c->logtelegrams = true;
            i++;
            continue;
        }
        if (!strncmp(argv[i], "--robot", 7)) {
            if (strlen(argv[i]) == 7 ||
                (strlen(argv[i]) == 12 &&
                 !strncmp(argv[i]+7, "=json", 5)))
            {
                c->json = true;
                c->fields = false;
            }
            else if (strlen(argv[i]) == 14 &&
                     !strncmp(argv[i]+7, "=fields", 7))
            {
                c->json = false;
                c->fields = true;
                c->separator = ';';
            } else {
                error("Unknown output format: \"%s\"\n", argv[i]+7);
            }
            i++;
            continue;
        }
        if (!strncmp(argv[i], "--separator=", 12)) {
            if (!c->fields) {
                error("You must specify --robot=fields before --separator=X\n");
            }
            if (strlen(argv[i]) != 13) {
                error("You must supply a single character as the field separator.\n");
            }
            c->separator = argv[i][12];
            i++;
            continue;
        }
        if (!strncmp(argv[i], "--meterfiles", 12)) {
            c->meterfiles = true;
            if (strlen(argv[i]) > 12 && argv[i][12] == '=') {
                size_t len = strlen(argv[i])-13;
                if (len > 0) {
                    c->meterfiles_dir = new char[len+1];
                    strncpy((char*)c->meterfiles_dir, argv[i]+13, len);
                } else {
                    c->meterfiles_dir = "/tmp";
                }
            } else {
                c->meterfiles_dir = "/tmp";
            }
            if (!checkIfDirExists(c->meterfiles_dir)) {
                error("Cannot write meter files into dir \"%s\"\n", c->meterfiles_dir);
            }
            i++;
            continue;
        }
        if (!strcmp(argv[i], "--oneshot")) {
            c->oneshot = true;
            i++;
            continue;
        }
        if (!strncmp(argv[i], "--exitafter=", 12) && strlen(argv[i]) > 12) {
            c->exitafter = parseTime(argv[i]+12);
            if (c->exitafter <= 0) {
                error("Not a valid time to exit after. \"%s\"\n", argv[i]+12);
            }
            i++;
            continue;
        }
        if (!strcmp(argv[i], "--")) {
            i++;
            break;
        }
        error("Unknown option \"%s\"\n", argv[i]);
    }

    c->usb_device = argv[i];
    i++;
    if (!c->usb_device) error("You must supply the usb device to which the wmbus dongle is connected.\n");

    if ((argc-i) % 4 != 0) {
        error("For each meter you must supply a: name,type,id and key.\n");
    }
    int num_meters = (argc-i)/4;

    for (int m=0; m<num_meters; ++m) {
        char *name = argv[m*4+i+0];
        char *type = argv[m*4+i+1];
        char *id = argv[m*4+i+2];
        char *key = argv[m*4+i+3];

        MeterType mt = toMeterType(type);

        if (mt == UNKNOWN_METER) error("Not a valid meter type \"%s\"\n", type);
        if (!isValidId(id)) error("Not a valid meter id \"%s\"\n", id);
        if (!isValidKey(key)) error("Not a valid meter key \"%s\"\n", key);
        c->meters.push_back(MeterInfo(name,type,id,key));
    }

    return c;
}