#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_dec_interceptor.h"
#include <time.h>

zend_op_array *(*prev_compile_file)(zend_file_handle *file_handle, int type) = NULL;
zend_op_array *(*prev_compile_string)(zval *source_string, const char *filename) = NULL;
void (*prev_execute_ex)(zend_execute_data *execute_data) = NULL;

zend_op_array *hook_compile_file(zend_file_handle *file_handle, int type)
{
    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] hook_compile_file called\n", (long)time(NULL));

        if (file_handle) {
            if (file_handle->filename) {
                fprintf(f, "[%ld] file_handle->filename = %s\n", (long)time(NULL), file_handle->filename);
            } else {
                fprintf(f, "[%ld] file_handle->filename = (null)\n", (long)time(NULL));
            }
        }

        fclose(f);
    }

    return prev_compile_file ? prev_compile_file(file_handle, type) : NULL;
}


zend_op_array *hook_compile_string(zval *source_string, const char *filename)
{
    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] hook_compile_string: filename = %s\n", (long)time(NULL), filename ? filename : "(null)");
        if (Z_TYPE_P(source_string) == IS_STRING) {
            zend_string *s = Z_STR_P(source_string);
            fprintf(f, "[DECRYPTED] %.*s\n", (int)(s->len > 200 ? 200 : s->len), s->val);
        }
        fclose(f);
    }

    return prev_compile_string ? prev_compile_string(source_string, filename) : NULL;
}

void hook_execute_ex(zend_execute_data *execute_data)
{
    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        const zend_function *func = execute_data->func;
        if (func && func->common.function_name) {
            fprintf(f, "[%ld] hook_execute_ex: %s\n", (long)time(NULL), ZSTR_VAL(func->common.function_name));
        } else {
            fprintf(f, "[%ld] hook_execute_ex: (no name)\n", (long)time(NULL));
        }
        fclose(f);
    }

    if (prev_execute_ex) {
        prev_execute_ex(execute_data);
    }
}

PHP_RINIT_FUNCTION(dec_interceptor)
{
    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] RINIT: zend_compile_file = %p\n", (long)time(NULL), zend_compile_file);
        fclose(f);
    }
    return SUCCESS;
}

PHP_MINIT_FUNCTION(dec_interceptor)
{
    prev_compile_file = zend_compile_file;
    zend_compile_file = hook_compile_file;

    prev_compile_string = zend_compile_string;
    zend_compile_string = hook_compile_string;

    prev_execute_ex = zend_execute_ex;
    zend_execute_ex = hook_execute_ex;

    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] MINIT done\n", (long)time(NULL));
        fclose(f);
    }

    return SUCCESS;
}

PHP_MSHUTDOWN_FUNCTION(dec_interceptor)
{
    zend_compile_file = prev_compile_file;
    zend_compile_string = prev_compile_string;
    zend_execute_ex = prev_execute_ex;

    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] MSHUTDOWN done\n", (long)time(NULL));
        fclose(f);
    }

    return SUCCESS;
}

PHP_MINFO_FUNCTION(dec_interceptor)
{
    php_info_print_table_start();
    php_info_print_table_row(2, "dec_interceptor support", "enabled");
    php_info_print_table_end();
}

zend_module_entry dec_interceptor_module_entry = {
    STANDARD_MODULE_HEADER,
    "dec_interceptor",
    NULL,
    PHP_MINIT(dec_interceptor),
    PHP_MSHUTDOWN(dec_interceptor),
    PHP_RINIT(dec_interceptor),
    NULL,
    PHP_MINFO(dec_interceptor),
    PHP_DEC_INTERCEPTOR_VERSION,
    STANDARD_MODULE_PROPERTIES
};

ZEND_GET_MODULE(dec_interceptor)
