#include "excluded_modules.h"

#include <php.h>
#include <stdbool.h>

#include <ext/standard/php_versioning.h>

#include <components/log/log.h>
#include "configuration.h"

bool ddtrace_is_excluded_module(zend_module_entry *module, char *error) {
#if PHP_VERSION_ID >= 80000
    if (strcmp("ionCube Loader", module->name) == 0) {
        snprintf(error, DDTRACE_EXCLUDED_MODULES_ERROR_MAX_LEN,
                     "Found incompatible ionCube Loader extension");
        return true;
    }
#endif

    if (strcmp("xdebug", module->name) == 0) {
        /*
        PHP 7.0 was only supported from Xdebug 2.4 through 2.7
        @see: https://xdebug.org/docs/compat
        */
#if PHP_VERSION_ID < 70100
        snprintf(error, DDTRACE_EXCLUDED_MODULES_ERROR_MAX_LEN,
                 "Found incompatible Xdebug version %s", module->version);
        return true;
#endif
        /*
        Xdebug versions < 2.9.3 did not call neighboring extension's opcode handlers.
        @see: https://github.com/xdebug/xdebug/commit/87c61401e27df786a06cc881bd2011ce985b08dd
        @see: https://xdebug.org/announcements/2020-03-13

        A bug was introduced in Xdebug version 2.9.1 that would cause a SIGSEGV when xdebug.remote_enable=1
        and a neighboring extension compiles PHP in RINIT. This was fixed in Xdebug 2.9.5.
        @see: https://bugs.xdebug.org/view.php?id=1736
        @see: https://bugs.xdebug.org/view.php?id=1775
        @see: https://github.com/xdebug/xdebug/commit/6c6c08233593ffc1d64d70c51c56f567e6528010
        @see: https://xdebug.org/announcements/2020-04-25

        Ideally we would disable Xdebug 2.9.3 and 2.9.4 only when xdebug.remote_enable=1, but the SIGSEGV
        happens when ddtrace compiles PHP in RINIT. This occurs before Xdebug's INI settings are loaded and
        we are therefore unable to check the value of xdebug.remote_enable.
        */
        int compare = php_version_compare(module->version, "2.9.5");
        if (compare == -1) {
            snprintf(error, DDTRACE_EXCLUDED_MODULES_ERROR_MAX_LEN,
                     "Found incompatible Xdebug version %s; ddtrace requires Xdebug 2.9.5 or greater",
                     module->version);
            return true;
        }
    }
    return false;
}

void ddtrace_excluded_modules_startup() {
    zend_module_entry *module;

    ddtrace_has_excluded_module = false;
    bool inject_force = get_global_DD_INJECT_FORCE();

    ZEND_HASH_FOREACH_PTR(&module_registry, module) {
        char error[DDTRACE_EXCLUDED_MODULES_ERROR_MAX_LEN + 1];
        if (module && module->name && module->version && ddtrace_is_excluded_module(module, error)) {
            ddtrace_has_excluded_module = true;
            if (inject_force) {
                LOG(WARN, error);
            } else {
                LOG(ERROR, error);
            }
        }
    }
    ZEND_HASH_FOREACH_END();

    if (ddtrace_has_excluded_module) {
        if (inject_force) {
            LOG(WARN, "Found incompatible extension(s); ignoring since 'datadog.inject_force' is enabled");
            ddtrace_has_excluded_module = false;
        } else {
            LOG(ERROR, "Found incompatible extension(s); disabling conflicting functionality");
        }
    }
}