#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>

#include "config.h"


struct config_symbol {
	char* name;
	char* value;
};

static struct config_symbol config[] = {
	{"RTMP_HOST", NULL},
	{"RTMP_PORT", NULL},
	{"RTMP_APP", NULL},
	{"CAM_COMMANDER_HOST", NULL},
	{"CAM_COMMANDER_PORT", NULL},
	{"SERIAL_NUMBER", NULL},
	{"PRODUCT_KEY", NULL},
	{NULL, NULL}
};

int config_set(char* name, char* value) {
	unsigned int i;
	for(i = 0; config[i].name != NULL; i++) {
		if(!strcmp(config[i].name, name)) {
			size_t value_size = strlen(value);
			if(config[i].value == NULL) {
				if((config[i].value = malloc(value_size + 1)) == NULL) {
					fprintf(stderr, "error malloc()\n");
					exit(-1);
				}
			} else {
				if((config[i].value = realloc(config[i].value, value_size + 1)) == NULL) {
					fprintf(stderr, "error realloc()\n");
					exit(-1);
				}	
			}
			strcpy(config[i].value, value);
			return 0;
		}
	}
	return -1;
}

void config_free() {
	unsigned int i;
	for(i = 0; config[i].name != NULL; i++) {
		if(config[i].value != NULL) {
			free(config[i].value);
			config[i].value = NULL;
		}
	}
}

char* config_get(char* name) {
	unsigned int i;
	for(i = 0; config[i].name != NULL; i++) {
		if(!strcmp(config[i].name, name)) {
			return config[i].value;
		}
	}
	return NULL;
}

int config_check_values() {
	unsigned int i;
	int ret = 0;
	for(i = 0; config[i].name != NULL; i++) {
		if(config[i].value == NULL) {
			fprintf(stderr, "[CameraManager] (error) : The configuration variable <%s> is not set\n", config[i].name);
			ret = -1;
		}
	}
	return ret;
}

void config_load_default_values() {
	config_free();
	config_set("RTMP_PORT", "1935");
	config_set("CAM_COMMANDER_PORT", "41551");
}

int config_load_from_file(char* path) {
	char tmp_name[256];
	char tmp_value[256];
	int c;
	int scan;
	FILE* file;

	printf("[CameraManager] : Load configuration from file <%s>...", path);

	file = fopen(path, "r");
	if(file == NULL) {
		printf("Failed\n");
		perror("config_load_from_file");
		return -1;
	}

	do {
		scan = fscanf(file, "%[A-Za-z0-9_]=%s", tmp_name, tmp_value);
		if(scan == 2) {
			config_set(tmp_name, tmp_value);
		} else if(scan == EOF) {
			break;
		}

		do {
			c = fgetc(file);
		} while(c != EOF && c != '\n');
	} while(!feof(file));

	fclose(file);
	printf("Success\n");
	return 0;
}