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/* $Id: ircfw.c 2 2024-09-09 13:22:05Z nishi $ */

#define IRCFW_SRC
#include "ircfw.h"

#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

#include <sys/socket.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>

struct ircfw_message ircfw_message;

char* ircfw_strcat(const char* a, const char* b) {
        char* str = malloc(strlen(a) + strlen(b) + 1);
        memcpy(str, a, strlen(a));
        memcpy(str + strlen(a), b, strlen(b));
        str[strlen(a) + strlen(b)] = 0;
        return str;
}

char* ircfw_strcat3(const char* a, const char* b, const char* c) {
        char* tmp = ircfw_strcat(a, b);
        char* str = ircfw_strcat(tmp, c);
        free(tmp);
        return str;
}

char* ircfw_strdup(const char* str) { return ircfw_strcat(str, ""); }

void ircfw_init(void) {
        ircfw_message.prefix = NULL;
        ircfw_message.params = NULL;
        ircfw_message.command = NULL;
}

void ircfw_parse_params(const char* str) {
        ircfw_message.params = malloc(sizeof(*ircfw_message.params));
        ircfw_message.params[0] = NULL;
        int i;
        int incr = 0;
        bool until_end = false;
        char* dup = ircfw_strdup(str);
        for(i = 0;; i++) {
                if(dup[i] == 0 || (!until_end && dup[i] == ' ')) {
                        char oldc = dup[i];
                        dup[i] = 0;

                        char* param = ircfw_strdup(dup + incr);

                        char** old_params = ircfw_message.params;
                        int j;
                        for(j = 0; old_params[j] != NULL; j++)
                                ;
                        ircfw_message.params = malloc(sizeof(*ircfw_message.params) * (2 + j));
                        for(j = 0; old_params[j] != NULL; j++) {
                                ircfw_message.params[j] = old_params[j];
                        }
                        ircfw_message.params[j] = param;
                        ircfw_message.params[j + 1] = NULL;
                        free(old_params);

                        incr = i + 1;
                        if(oldc == 0) break;
                } else if(dup[i] == ':' && !until_end) {
                        until_end = true;
                        incr = i + 1;
                }
        }
        free(dup);
}

int ircfw_socket_send_cmd(int sock, const char* name, const char* cmd) {
        char* str = ircfw_strcat(cmd, "\r\n");
        if(name != NULL) {
                char* old = str;
                char* tmp = ircfw_strcat3(":", name, " ");
                str = ircfw_strcat(tmp, old);
                free(old);
                free(tmp);
        }
        int st = send(sock, str, strlen(str), 0);
        free(str);
        return st < 0 ? 1 : 0;
}

int ircfw_socket_read_cmd(int sock) {
        char c[2];
        c[1] = 0;
        char* str = malloc(1);
        str[0] = 0;
        bool err = false;
        bool end = false;
        while(1) {
                int s = recv(sock, c, 1, 0);
                if(s <= 0) {
                        err = true;
                        break;
                }
                if(c[0] == '\n') {
                        end = true;
                        break;
                } else if(c[0] != '\r') {
                        char* tmp = str;
                        str = ircfw_strcat(tmp, c);
                        free(tmp);
                }
        }
        if(ircfw_message.prefix != NULL) free(ircfw_message.prefix);
        if(ircfw_message.params != NULL) {
                int i;
                for(i = 0; ircfw_message.params[i] != NULL; i++) {
                        free(ircfw_message.params[i]);
                }
                free(ircfw_message.params);
        }
        if(ircfw_message.command != NULL) free(ircfw_message.command);
        ircfw_message.prefix = NULL;
        ircfw_message.params = NULL;
        ircfw_message.command = NULL;

        if(str[0] == ':') {
                int i;
                for(i = 0; str[i] != 0; i++) {
                        if(str[i] == ' ') {
                                str[i] = 0;
                                ircfw_message.prefix = ircfw_strdup(str + 1);
                                i++;
                                int start = i;
                                for(;; i++) {
                                        if(str[i] == ' ' || str[i] == 0) {
                                                char oldc = str[i];
                                                str[i] = 0;
                                                ircfw_message.command = ircfw_strdup(str + start);
                                                if(oldc != 0) {
                                                        i++;
                                                        ircfw_parse_params(str + i);
                                                }
                                                break;
                                        }
                                }
                                break;
                        }
                }
        } else {
                int i;
                for(i = 0; str[i] != 0; i++) {
                        if(str[i] == ' ' || str[i] == 0) {
                                char oldc = str[i];
                                str[i] = 0;
                                ircfw_message.command = ircfw_strdup(str);
                                if(oldc != 0) {
                                        i++;
                                        ircfw_parse_params(str + i);
                                }
                                break;
                        }
                }
        }

        free(str);
        return err ? 1 : 0;
}