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/* $Id: cgi.c 2 2024-09-11 09:16:23Z nishi $ */

#include "../config.h"

#include "kn_cgi.h"

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

#include "kn_version.h"
#include "kn_util.h"

struct q_entry {
        char* key;
        char* value;
};

bool no = false;
bool showmain = false;
struct q_entry** entries = NULL;

char* kn_get_query(const char* key){
        if(entries == NULL) return NULL;
        int i;
        for(i = 0; entries[i] != NULL; i++){
                if(strcmp(entries[i]->key, key) == 0 ) return entries[i]->value;
        }
        return NULL;
}

char* kn_null(const char* a){
        return a == NULL ? "" : (char*)a;
}

void kn_parse_query(void){
        char* query = getenv("QUERY_STRING");
        if(query != NULL){
                entries = malloc(sizeof(*entries));
                entries[0] = NULL;
                int i;
                int incr = 0;
                for(i = 0;; i++){
                        if(query[i] == 0 || query[i] == '&'){
                                char* a = malloc(i - incr + 1);
                                memcpy(a, query + incr , i - incr);
                                a[i - incr] = 0;

                                char* key = a;
                                char* value = "";

                                int j;
                                for(j = 0; key[j] != 0; j++){
                                        if(key[j] == '='){
                                                key[j] = 0;
                                                value = key + j + 1;
                                                break;
                                        }
                                }

                                struct q_entry* e = malloc(sizeof(*e));
                                e->key = kn_strdup(key);
                                e->value = kn_strdup(value);

                                struct q_entry** old = entries;
                                for(j = 0; old[j] != NULL; j++);
                                entries = malloc(sizeof(*entries) * (j + 2));
                                for(j = 0; old[j] != NULL; j++) entries[j] = old[j];
                                entries[j] = e;
                                entries[j + 1] = NULL;
                                free(old);

                                free(a);

                                incr = i + 1;
                                if(query[i] == 0) break;
                        }
                }
        }
        if(kn_get_query("page") == NULL){
                printf("Status: 200 OK\n\n");
                showmain = true;
        }else{
                printf("Status: 404 Not Found\n\n");
                no = true;
        }
}

void kn_cgi(void){
        printf("<html>\n");
        printf("        <head>\n");
        printf("                <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n");
        printf("                <title>Keine - ");
        if(no){
                printf("Not found");
        }else if(showmain){
                printf("Main");
        }
        printf("</title>\n");
        printf("                <style>\n");
        printf("html {\n");
        printf("        background-color: #222222;\n");
        printf("        color: #ffffff;\n");
        printf("}\n");
        printf("body {\n");
        printf("        width: 900px;\n");
        printf("        margin: 0 auto;\n");
        printf("}\n");
        printf("a:link {\n");
        printf("        color: #88f;\n");
        printf("}\n");
        printf("a:visited {\n");
        printf("        color: #44b;\n");
        printf("}\n");
        printf("                </style>\n");
        printf("        </head>\n");
        printf("        <body>\n");
        printf("                <div style=\"text-align: center;\">\n");
        printf("                        <form action=\"%s%s\">\n", getenv("SCRIPT_NAME"), kn_null(getenv("PATH_INFO")));
        printf("                                <a href=\"%s%s\">Main</a> | ", getenv("SCRIPT_NAME"), kn_null(getenv("PATH_INFO")));
        printf("                                Name: <input name=\"page\">\n");
        printf("                                <input type=\"submit\">\n");
        printf("                        </form>\n");
        printf("                </div>\n");
        printf("                <hr>\n");
        if(no){
                printf("                Not found.\n");
        }else if(showmain){
        }
        printf("                <hr>\n");
        printf("                <i>Generated by Keine <a href=\"http://nishi.boats/keine\">%s</a></i>\n", kn_get_version());
        printf("        </body>\n");
        printf("</html>\n");
}