/* This work is licensed under a Creative Commons CCZero 1.0 Universal License.
 * See http://creativecommons.org/publicdomain/zero/1.0/ for more information. */

#include <open62541/server_config_default.h>
#include <open62541/plugin/accesscontrol_default.h>
#include <open62541/client_highlevel.h>
#include <open62541/plugin/log_stdout.h>
#include <open62541/plugin/securitypolicy.h>
#include <open62541/server.h>
#include <open62541/server_config_default.h>

#include <stdlib.h>

#include "common.h"

/* This is a test server to the ci script. It can be used for some of the examples that need a server to connect.
* It allows to connect with the username "peter" and "paula" and the password "peter123" and "paula123" or "user1" and "password". Anonymus login is also allowed.
* The server has a method "hello world" and a variable "the answer" that can be written to.
* The server certificate and private key are loaded from the command line arguments.
*/

#define MIN_ARGS 4

static UA_UsernamePasswordLogin logins[3] = {
    {UA_STRING_STATIC("peter"), UA_STRING_STATIC("peter123")},
    {UA_STRING_STATIC("paula"), UA_STRING_STATIC("paula123")},
    {UA_STRING_STATIC("user1"), UA_STRING_STATIC("password")}
};

static UA_StatusCode
helloWorldMethodCallback(UA_Server *server,
                         const UA_NodeId *sessionId, void *sessionHandle,
                         const UA_NodeId *methodId, void *methodContext,
                         const UA_NodeId *objectId, void *objectContext,
                         size_t inputSize, const UA_Variant *input,
                         size_t outputSize, UA_Variant *output) {
    UA_String *inputStr = (UA_String*)input->data;
    UA_String tmp = UA_STRING_ALLOC("Hello ");
    if(inputStr->length > 0) {
        tmp.data = (UA_Byte *)UA_realloc(tmp.data, tmp.length + inputStr->length);
        memcpy(&tmp.data[tmp.length], inputStr->data, inputStr->length);
        tmp.length += inputStr->length;
    }
    UA_Variant_setScalarCopy(output, &tmp, &UA_TYPES[UA_TYPES_STRING]);
    UA_String_clear(&tmp);
    UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_SERVER, "Hello World was called");
    return UA_STATUSCODE_GOOD;
}

static void
addHelloWorldMethod(UA_Server *server) {
    UA_Argument inputArgument;
    UA_Argument_init(&inputArgument);
    inputArgument.description = UA_LOCALIZEDTEXT("en-US", "A String");
    inputArgument.name = UA_STRING("MyInput");
    inputArgument.dataType = UA_TYPES[UA_TYPES_STRING].typeId;
    inputArgument.valueRank = UA_VALUERANK_SCALAR;

    UA_Argument outputArgument;
    UA_Argument_init(&outputArgument);
    outputArgument.description = UA_LOCALIZEDTEXT("en-US", "A String");
    outputArgument.name = UA_STRING("MyOutput");
    outputArgument.dataType = UA_TYPES[UA_TYPES_STRING].typeId;
    outputArgument.valueRank = UA_VALUERANK_SCALAR;

    UA_MethodAttributes helloAttr = UA_MethodAttributes_default;
    helloAttr.description = UA_LOCALIZEDTEXT("en-US","Say `Hello World`");
    helloAttr.displayName = UA_LOCALIZEDTEXT("en-US","Hello World");
    helloAttr.executable = true;
    helloAttr.userExecutable = true;
    UA_Server_addMethodNode(server, UA_NODEID_NUMERIC(1,62541),
                            UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
                            UA_NODEID_NUMERIC(0, UA_NS0ID_HASCOMPONENT),
                            UA_QUALIFIEDNAME(1, "hello world"),
                            helloAttr, &helloWorldMethodCallback,
                            1, &inputArgument, 1, &outputArgument, NULL, NULL);
}

static void
addVariable(UA_Server *server) {
    /* Define the attribute of the myInteger variable node */
    UA_VariableAttributes attr = UA_VariableAttributes_default;
    UA_Int32 myInteger = 42;
    UA_Variant_setScalar(&attr.value, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
    attr.description = UA_LOCALIZEDTEXT("en-US","the answer");
    attr.displayName = UA_LOCALIZEDTEXT("en-US","the answer");
    attr.dataType = UA_TYPES[UA_TYPES_INT32].typeId;
    attr.accessLevel = UA_ACCESSLEVELMASK_READ | UA_ACCESSLEVELMASK_WRITE;

    /* Add the variable node to the information model */
    UA_NodeId myIntegerNodeId = UA_NODEID_STRING(1, "the.answer");
    UA_QualifiedName myIntegerName = UA_QUALIFIEDNAME(1, "the answer");
    UA_NodeId parentNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
    UA_NodeId parentReferenceNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES);
    UA_Server_addVariableNode(server, myIntegerNodeId, parentNodeId,
                              parentReferenceNodeId, myIntegerName,
                              UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE), attr, NULL, NULL);
}

static void
writeVariable(UA_Server *server) {
    UA_NodeId myIntegerNodeId = UA_NODEID_STRING(1, "the.answer");

    /* Write a different integer value */
    UA_Int32 myInteger = 43;
    UA_Variant myVar;
    UA_Variant_init(&myVar);
    UA_Variant_setScalar(&myVar, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
    UA_Server_writeValue(server, myIntegerNodeId, myVar);

    /* Set the status code of the value to an error code. The function
     * UA_Server_write provides access to the raw service. The above
     * UA_Server_writeValue is syntactic sugar for writing a specific node
     * attribute with the write service. */
    UA_WriteValue wv;
    UA_WriteValue_init(&wv);
    wv.nodeId = myIntegerNodeId;
    wv.attributeId = UA_ATTRIBUTEID_VALUE;
    wv.value.status = UA_STATUSCODE_BADNOTCONNECTED;
    wv.value.hasStatus = true;
    UA_Server_write(server, &wv);

    /* Reset the variable to a good statuscode with a value */
    wv.value.hasStatus = false;
    wv.value.value = myVar;
    wv.value.hasValue = true;
    UA_Server_write(server, &wv);
}

int main(int argc, char* argv[]) {
    UA_StatusCode retval = 0;

    UA_Server *server = UA_Server_new();
    UA_ServerConfig *config = UA_Server_getConfig(server);

#ifdef UA_ENABLE_ENCRYPTION
    UA_ByteString certificate = UA_BYTESTRING_NULL;
    UA_ByteString privateKey = UA_BYTESTRING_NULL;
    UA_UInt16 port = 0;
    if(argc >= 4) {
        /* Load port, certificate and private key */
        port = (UA_UInt16) atoi(argv[1]);
        certificate = loadFile(argv[2]);
        privateKey = loadFile(argv[3]);
        // print the certificat and private key
        printf("certificate: %.*s\n", (int)certificate.length, certificate.data);
    } else {
        UA_LOG_FATAL(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
                     "Missing arguments. Arguments are "
                     "<port> <server-certificate.der> <private-key.der> "
                     "[<trustlist1.crl>, ...]");

        return EXIT_SUCCESS;
    }

    /* Load the trustlist */
    size_t trustListSize = 0;
    if(argc > 4)
        trustListSize = (size_t)argc-4;
    UA_STACKARRAY(UA_ByteString, trustList, trustListSize+1);
    for(size_t i = 0; i < trustListSize; i++)
        trustList[i] = loadFile(argv[i+4]);

    /* Loading of an issuer list, not used in this application */
    size_t issuerListSize = 0;
    UA_ByteString *issuerList = NULL;

    /* Loading of a revocation list currently unsupported */
    UA_ByteString *revocationList = NULL;
    size_t revocationListSize = 0;


     retval = UA_ServerConfig_setDefaultWithSecurityPolicies(config, port,
                                                       &certificate, &privateKey,
                                                       trustList, trustListSize,
                                                       issuerList, issuerListSize,
                                                       revocationList, revocationListSize);
                                                           UA_ByteString_clear(&certificate);
    UA_ByteString_clear(&privateKey);
    for(size_t i = 0; i < trustListSize; i++)
        UA_ByteString_clear(&trustList[i]);
    if(retval != UA_STATUSCODE_GOOD)
        goto cleanup;   

#endif
    retval = UA_AccessControl_default(config, true,
             &config->securityPolicies[config->securityPoliciesSize-1].policyUri, 3, logins);
    if(retval != UA_STATUSCODE_GOOD)
        goto cleanup;
        
    addHelloWorldMethod(server);
    addVariable(server);
    writeVariable(server);

    retval = UA_Server_runUntilInterrupt(server);

    if(retval != UA_STATUSCODE_GOOD)
        goto cleanup;
 cleanup:
    UA_Server_delete(server);
    return retval == UA_STATUSCODE_GOOD ? EXIT_SUCCESS : EXIT_FAILURE;
}