#include <sys/time.h>

#include "trick/MonteCarlo.hh"
#include "trick/memorymanager_c_intf.h"
#include "trick/command_line_protos.h"
#include "trick/tc_proto.h"
#include "trick/message_proto.h"
#include "trick/message_type.h"
#include "trick/exec_proto.h"

void Trick::MonteCarlo::set_enabled(bool in_enabled) {
    this->enabled = in_enabled;
}

bool Trick::MonteCarlo::get_enabled() {
    return enabled;
}

void Trick::MonteCarlo::set_dry_run(bool in_dry_run) {
    this->dry_run = in_dry_run;
}

bool Trick::MonteCarlo::get_dry_run() {
    return dry_run;
}

bool Trick::MonteCarlo::is_slave() {
    if (slave_id == 0) {
       return false;
    }
    return true;
}

bool Trick::MonteCarlo::is_master() {
    if (slave_id == 0) {
       return true;
    }
    return false;
}

void Trick::MonteCarlo::set_localhost_as_remote(bool in_localhost_as_remote) {
    this->localhost_as_remote = in_localhost_as_remote;
}

bool Trick::MonteCarlo::get_localhost_as_remote() {
    return localhost_as_remote;
}

void Trick::MonteCarlo::set_custom_slave_dispatch(bool in_custom_slave_dispatch) {
    this->custom_slave_dispatch = in_custom_slave_dispatch;
}

bool Trick::MonteCarlo::get_custom_slave_dispatch() {
    return custom_slave_dispatch;
}

void Trick::MonteCarlo::set_timeout(double in_timeout) {
    this->timeout = in_timeout;
}

double Trick::MonteCarlo::get_timeout() {
    return timeout;
}

void Trick::MonteCarlo::set_max_tries(unsigned int in_max_tries) {
    this->max_tries = in_max_tries;
}

unsigned int Trick::MonteCarlo::get_max_tries() {
    return max_tries;
}

void Trick::MonteCarlo::set_user_cmd_string(std::string in_user_cmd_string) {
    this->user_cmd_string = in_user_cmd_string;
}

std::string Trick::MonteCarlo::get_user_cmd_string() {
    return user_cmd_string;
}

void Trick::MonteCarlo::set_custom_pre_text(std::string in_custom_pre_text) {
    this->custom_pre_text = in_custom_pre_text;
}

std::string Trick::MonteCarlo::get_custom_pre_text() {
    return custom_pre_text;
}

void Trick::MonteCarlo::set_custom_post_text(std::string in_custom_post_text) {
    this->custom_post_text = in_custom_post_text;
}

std::string Trick::MonteCarlo::get_custom_post_text() {
    return custom_post_text;
}

void Trick::MonteCarlo::set_verbosity(Trick::MonteCarlo::Verbosity in_verbosity) {
    this->verbosity = in_verbosity;
}

Trick::MonteCarlo::Verbosity Trick::MonteCarlo::get_verbosity() {
    return verbosity;
}

void Trick::MonteCarlo::set_num_runs(unsigned int in_num_runs) {
    while (this->num_runs < in_num_runs) {
        runs.push_back(new Trick::MonteRun(this->num_runs++));
    }
    while ( (this->num_runs > in_num_runs) && !runs.empty() ) {
        delete runs.front();
        runs.pop_front();
        --this->num_runs;
    }
    update_actual_num_runs();
}
  
unsigned int Trick::MonteCarlo::get_num_runs() {
    return num_runs;
}

unsigned int Trick::MonteCarlo::get_num_results() {
    return num_results;
}

unsigned int Trick::MonteCarlo::get_slave_id() {
    return slave_id;
}

void Trick::MonteCarlo::add_range(unsigned int start, unsigned int end) {
    run_ranges.push_back(new MonteRange(start, end));
    update_actual_num_runs();
}

/**
 * @par Detailed Design:
 * If there are no ranges specified, all runs are in range.
 */
bool Trick::MonteCarlo::in_range(Trick::MonteRun *in_run) {
     if (run_ranges.size() == 0) {
         return true;
     }
     for (std::vector<Trick::MonteRange>::size_type i = 0; i < run_ranges.size(); ++i) {
         if (in_run->id >= run_ranges[i]->get_start() && in_run->id <= run_ranges[i]->get_end()) {
             return true;
         }
     }
     return false;
}

void Trick::MonteCarlo::get_ranges(std::vector<MonteRange *> &ranges) {
    ranges = run_ranges;
}

void Trick::MonteCarlo::add_variable(Trick::MonteVar *variable) {
    variables.push_back(variable);
}

void Trick::MonteCarlo::add_slave(std::string in_machine_name) {
    add_slave(new MonteSlave(in_machine_name));
}

/**
 * @par Detailed Design:
 * The first slave added is assigned an id of one. Additional slaves receive ids of one plus the id of the last slave on
 * the list, ensuring that every slave has a unique id. This function has no effect if the slave has been previously added.
 */
void Trick::MonteCarlo::add_slave(Trick::MonteSlave *in_slave) {
    if (get_slave_index(in_slave->id) == -1) {
        if (slaves.empty()) {
            in_slave->id = 1;
        } else {
            in_slave->id = slaves.back()->id + 1;
        }
        slaves.push_back(in_slave);
        sync_slaves_head();
    }
}

/**
 * @par Detailed Design:
 * This function has an effect only if the slave exists and is in the STOPPING, UNRESPONSIVE_STOPPING, or STOPPED state.
 */
void Trick::MonteCarlo::start_slave(unsigned int id) {
    if (MonteSlave *curr_slave = get_slave(id)) {
        if (verbosity >= ALL) {
            message_publish(MSG_INFO, "Monte [Master] Starting %s:%d.\n", curr_slave->machine_name.c_str(), curr_slave->id) ;
        }
        if (curr_slave->state == Trick::MonteSlave::STOPPING) {
            curr_slave->state = Trick::MonteSlave::RUNNING;
        } else if (curr_slave->state == Trick::MonteSlave::UNRESPONSIVE_STOPPING) {
            curr_slave->state = Trick::MonteSlave::UNRESPONSIVE_RUNNING;
        } else if (curr_slave->state == Trick::MonteSlave::STOPPED) {
            curr_slave->state = Trick::MonteSlave::READY;
        }
    }
}

/**
 * @par Detailed Design:
 * This function has an effect only if the slave exists and is in the READY, RUNNING, or UNRESPONSIVE_RUNNING state.
 */
void Trick::MonteCarlo::stop_slave(unsigned int id) {
    if (MonteSlave *curr_slave = get_slave(id)) {
        if (verbosity >= ALL) {
            message_publish(MSG_INFO, "Monte [Master] Stopping %s:%d.\n", curr_slave->machine_name.c_str(), curr_slave->id) ;
        }
        if (curr_slave->state == Trick::MonteSlave::READY) {
            curr_slave->state = Trick::MonteSlave::STOPPED;
        } else if (curr_slave->state == Trick::MonteSlave::RUNNING) {
            curr_slave->state = Trick::MonteSlave::STOPPING;
        } else if (curr_slave->state == Trick::MonteSlave::UNRESPONSIVE_RUNNING) {
            curr_slave->state = Trick::MonteSlave::UNRESPONSIVE_STOPPING;
        }
    }
}

/**
 * @par Detailed Design:
 * This function will only disable the slave when called from the input file at initialization.
 */
void Trick::MonteCarlo::disable_slave(std::string name, bool disabled){
    for (std::vector<MonteSlave *>::size_type i = 0; i < slaves.size(); ++i) {
        if (equals_ignore_case(slaves[i]->machine_name, name)) {
            if (disabled) {
                slaves[i]->state = Trick::MonteSlave::STOPPED;
            } else {
                slaves[i]->state = Trick::MonteSlave::UNINITIALIZED;
            }
            return;
        }
    }    
}

int Trick::MonteCarlo::process_sim_args() {
    int argc = command_line_args_get_argc() ;
    char **argv = command_line_args_get_argv() ;

    if (argc > 2) {
        for (int i = 2; i < argc; ++i) {
            if (!strncmp("--monte_host", argv[i], 12)) {
                connection_device.hostname = strdup(argv[++i]);
                data_connection_device.hostname = strdup(argv[i]);
            } else if (!strncmp("--monte_sync_port", argv[i], 17)) {
                sscanf(argv[++i], "%d", &master_port);
                connection_device.port = master_port;
            } else if (!strncmp("--monte_data_port", argv[i], 17)) {
                sscanf(argv[++i], "%d", &data_port);
                data_connection_device.port = data_port;
            } else if (!strncmp("--monte_client_id", argv[i], 12)) {
                sscanf(argv[++i], "%d", &slave_id);
            }
        }
    }
    return 0;
}

/** @par Detailed Design: */
int Trick::MonteCarlo::shutdown() {
    /** <ul><li> If this is a slave, run the shutdown jobs. */
    if (enabled && is_slave()) {
        data_connection_device.port = data_port;
        if (tc_connect(&data_connection_device) == TC_SUCCESS) {
            int id = htonl(slave_id);
            tc_write(&data_connection_device, (char *)&id, (int)sizeof(id));
            int run_num = htonl(current_run);
            tc_write(&data_connection_device, (char *)&run_num, (int)sizeof(run_num));
            run_queue(&slave_post_queue, "in slave_post queue") ;
            tc_disconnect(&data_connection_device);
        } else {
            if (verbosity >= ERROR) 
                message_publish(MSG_ERROR, "Monte ERROR: Child failed to connect to data connection.\n") ;
        }
    }
    return 0;
}

/** @par Detailed Design: */
int Trick::MonteCarlo::socket_init(TCDevice *in_listen_device) {
    //  Modify the port number based on pid number to
    //  prevent two sims calling tc_init at the same time
    //  and getting the same port number.  However, if the
    //  user wants to use their own port numbers then do not 
    //  modify it.
    if (default_port_flag) {
        in_listen_device->port += getpid()%1000;
    }
    for (int i = 0; i < 200; ++i) {
        /** <ul><li> Initialize the listening device. */
        if (tc_init(in_listen_device) == TC_SUCCESS) {
            return TC_SUCCESS;
        }
        ++in_listen_device->port;
    }
    return TC_COULD_NOT_LISTEN_SOCKET ;
}

void Trick::MonteCarlo::handle_retry(MonteSlave *curr_slave, MonteRun::ExitStatus exit_status) {
    if (max_tries <= 0 || curr_slave->current_run->num_tries < max_tries) {
        // Add the run to the retry queue.
        if (verbosity >= ERROR) {
            message_publish(MSG_ERROR, "Monte [Master] Queueing run %d for retry.\n", curr_slave->current_run->id) ;
        }
        runs.push_back(curr_slave->current_run);
    } else {
        if (verbosity >= ERROR) {
            message_publish(MSG_ERROR, "Monte [Master] Run %d has reached its maximum allowed tries and has been skipped.\n",
                            curr_slave->current_run->id) ;
        }
        resolve_run(curr_slave, exit_status);
    }
}

/** @par Detailed Design: */
void Trick::MonteCarlo::resolve_run(MonteSlave *curr_slave, MonteRun::ExitStatus exit_status) {
    if (exit_status != MonteRun::COMPLETE) {
        failed_runs.push_back(curr_slave->current_run);
    }

    /** <li> Update the bookkeeping. */
    struct timeval time_val;
    gettimeofday(&time_val, NULL);
    curr_slave->current_run->end_time = time_val.tv_sec + (double)time_val.tv_usec / 1000000;
    curr_slave->current_run->exit_status = exit_status;

    ++curr_slave->num_results;
    curr_slave->cpu_time += curr_slave->current_run->end_time - curr_slave->current_run->start_time;

    ++num_results;

    if (verbosity >= ALL) {
        message_publish(MSG_INFO, "Monte [Master] Run %d has been resolved as: %d.\n",curr_slave->current_run->id, exit_status) ;
    }
}

/** @par Detailed Design: */
void Trick::MonteCarlo::check_timeouts() {
    struct timeval time_val;
    gettimeofday(&time_val, NULL);
    /** <ul><li> For every slave: */
    for (std::vector<Trick::MonteSlave *>::size_type i = 0; i < slaves.size(); ++i) {
        /** <ul><li> If the slave has timed out: */
        if ((slaves[i]->state == MonteSlave::RUNNING || slaves[i]->state == MonteSlave::STOPPING) &&
          (time_val.tv_sec + (double)time_val.tv_usec / 1000000 - slaves[i]->current_run->start_time) *
          slaves[i]->multiplier > timeout) {
            /**
             * <ul><li> This run might have been redispatched due to a previous timeout for which the slave actually returned
             * data later. Only process this timeout if the run hasn't been resolved yet.
             */
            if (slaves[i]->current_run->exit_status == MonteRun::INCOMPLETE) {
                if (verbosity >= ERROR) {
                    message_publish(MSG_ERROR, "Monte [Master] %s:%d has not responded for run %d.\n",
                                    slaves[i]->machine_name.c_str(), slaves[i]->id, slaves[i]->current_run->id) ;
                }
                handle_retry(slaves[i], MonteRun::TIMEDOUT);
            }
            /** </ul><li> Update the slave's state. */
            slaves[i]->state = slaves[i]->state == MonteSlave::RUNNING ?
               MonteSlave::UNRESPONSIVE_RUNNING : MonteSlave::UNRESPONSIVE_STOPPING;
        }
    }
}

Trick::MonteSlave * Trick::MonteCarlo::get_ready_slave() {
    for (std::vector<Trick::MonteSlave>::size_type i = 0; i < slaves.size(); ++i) {
        if (slaves[i]->state == Trick::MonteSlave::READY) {
            return slaves[i];
        }
    }
    return NULL;
}

Trick::MonteSlave* Trick::MonteCarlo::get_slave(unsigned int id) {
    int i = get_slave_index(id);
    if (i > -1) {
        return slaves[i];
    }
    return NULL;
}

int Trick::MonteCarlo::get_slave_index(unsigned int id) {
    for (std::vector<std::string>::size_type i = 0; i < slaves.size(); i++) {
        if (slaves[i]->id == id) {
            return i;
        }
    }
    return -1;
}

/** @par Detailed Design: */
Trick::MonteRun *Trick::MonteCarlo::get_next_dispatch() {
    /** <ul><li> While there are remaining runs: */
    while (!runs.empty()) {
        MonteRun *curr_run = runs.front();
        /** <ul><li> If this run hasn't been dispatched before: */
        if (curr_run->num_tries == 0) {
            /** <li> If it is in range, return it. </ul>*/
            if (in_range(curr_run)) {
                return curr_run;
            /** <li> Otherwise, run the pre run jobs and dequeue it. */
            } else {
                if (verbosity >= ALL) {
                    message_publish(MSG_WARNING, "Monte [Master] Run %d is out of range and has been skipped.\n", curr_run->id) ;
                }
                prepare_run(curr_run);
            }
        /**
         * <li> If this run has been dispatched before, it may have been requeued due to a slave timeout for which the slave
         * later returned results. In such a case, do not dispatch it again (return NULL). Otherwise, return it.
         */
        } else if (curr_run->exit_status == MonteRun::INCOMPLETE) {
            return curr_run;
        }
    }
    return NULL;
}

/** @par Detailed Design: */
int  Trick::MonteCarlo::prepare_run(MonteRun *curr_run) {
    current_run = curr_run->id;
    /** <ul><li> If this run has never been dispatched: */
    if (curr_run->num_tries == 0) {
        /** <ul><li> Run the pre run jobs. */
        run_queue(&master_pre_queue, "in master_pre queue") ;
        /** <li> Add the variables to the curr_run and check for end of file and value generation failures. */
        for (std::vector<std::string>::size_type i = 0; i < variables.size(); ++i) {
            curr_run->variables.push_back(variables[i]->get_next_value());
            if (curr_run->variables.back() == "EOF") {
                if (verbosity >= ALL) {
                    message_publish(MSG_WARNING, "Monte [Master] File variable '%s' reached end-of-file. Reducing number of runs to %d.\n",
                                    variables[i]->name.c_str(), curr_run->id) ;
                }
                set_num_runs(curr_run->id);
                return -1;
            }
        }
        /** <li> Create the data file </ul>*/
        fprintf(run_data_file, "%05u  ", curr_run->id);
        for (std::vector<std::string>::size_type i = 0; i < variables.size(); ++i) {
            if (i>0) {
                fprintf(run_data_file, " ");
            }
            fprintf(run_data_file, "%s", variables[i]->value.c_str());
        }
        fprintf(run_data_file, "\n");
    }
    /** <li> Dequeue the run. */
    dequeue_run(curr_run);
    return 0;
}

void Trick::MonteCarlo::dequeue_run(MonteRun *curr_run) {
    for (std::deque<MonteRun *>::size_type i = 0; i < runs.size(); ++i) {
        if (curr_run == runs[i]) {
            runs.erase(runs.begin() + i);
        }
    }
}

/**
 * @par Detailed Design:
 * Since the Variable Server is unable to access elements within the standard template objects, the data contained in
 * #slaves must be duplicated here for applications that wish to query the Variable Server for information on slaves,
 * such as @ref MonteMonitor and @ref TrickView. This function ensures that the slave pointers within #slaves_head point
 * to the same memory addresses that the slave pointers in #slaves do.
 */
void Trick::MonteCarlo::sync_slaves_head() {
    num_slaves = slaves.size();
    if (!slaves_head) {
        slaves_head = (MonteSlave**)TMM_declare_var_s("Trick::MonteSlave*[1]");
    } else {
        slaves_head = (MonteSlave**)TMM_resize_array_1d_a(slaves_head, num_slaves);
    }
    for (std::vector<MonteSlave *>::size_type i = 0; i < slaves.size(); ++i) {
        slaves_head[i] = slaves[i];
    }
}

/** @par Detailed Design: */
void Trick::MonteCarlo::update_actual_num_runs() {
    /** <ul><li> Start with the number of results obtained so far. */
    actual_num_runs = num_results;
    /** <li> Add the number of runs still on the queue that are in range. */
    for (std::vector<MonteRun *>::size_type i = 0; i < runs.size(); ++i) {
        if (in_range(runs[i])) {
            ++actual_num_runs;
        }
    }
    /** <li> Add one for every currently dispatched run. */
    for (std::vector<MonteSlave *>::size_type i = 0; i < slaves.size(); ++i) {
        if (slaves[i]->state == MonteSlave::RUNNING || slaves[i]->state == MonteSlave::STOPPING) {
            ++actual_num_runs;
        }
    }
}

bool Trick::MonteCarlo::equals_ignore_case(std::string string1, std::string string2) {
    if (string1.length() != string2.length()) {
        return false;
    }
    for (size_t i = 0; i < string1.length(); ++i) {
        if (tolower(string1[i]) != tolower(string2[i])) {
            return false;
        }
    }
    return true;
}

unsigned int Trick::MonteCarlo::get_current_run() {
    return (current_run) ;
}

void Trick::MonteCarlo::set_current_run(int run_num) {
    current_run = run_num ;
}

TCDevice* Trick::MonteCarlo::get_data_connection_device() {
    return (&data_connection_device);
}

void Trick::MonteCarlo::set_listen_device_port(int port_number) {
        listen_device.port = port_number ;
        default_port_flag = false ;
}

void Trick::MonteCarlo::set_data_listen_device_port(int port_number) {
        data_listen_device.port = port_number ;
        default_port_flag = false ;
}

void Trick::MonteCarlo::set_connection_device_port(int port_number) {
    // This port is passed to slave as an argument, do not override
    if (is_master()) {
        connection_device.port = port_number ;
        default_port_flag = false ;
    }
}

void Trick::MonteCarlo::set_data_connection_device_port(int port_number) {
    // This port is passed to slave as an argument, do not override
    if (is_master()) {
        data_connection_device.port = port_number ;
        default_port_flag = false ;
    }
}

int Trick::MonteCarlo::get_listen_device_port() {
    return listen_device.port ;
}

int Trick::MonteCarlo::get_data_listen_device_port() {
    return data_listen_device.port ;
}

int Trick::MonteCarlo::get_connection_device_port() {
    return connection_device.port ;
}

int  Trick::MonteCarlo::get_data_connection_device_port() {
    return data_connection_device.port ;
}

int Trick::MonteCarlo::instrument_job_before( Trick::JobData* instrument_job) {

    int count = 0 ;

    count += master_init_queue.instrument_before(instrument_job) ;
    count += master_pre_queue.instrument_before(instrument_job) ;
    count += master_post_queue.instrument_before(instrument_job) ;
    count += master_shutdown_queue.instrument_before(instrument_job) ;
    count += slave_init_queue.instrument_before(instrument_job) ;
    count += slave_pre_queue.instrument_before(instrument_job) ;
    count += slave_post_queue.instrument_before(instrument_job) ;
    count += slave_shutdown_queue.instrument_before(instrument_job) ;

    /** @li Return how many insertions were done. */
    return(count) ;
}

int Trick::MonteCarlo::instrument_job_after( Trick::JobData* instrument_job) {

    unsigned int count ;

    count = 0 ;

    count += master_init_queue.instrument_after(instrument_job) ;
    count += master_pre_queue.instrument_after(instrument_job) ;
    count += master_post_queue.instrument_after(instrument_job) ;
    count += master_shutdown_queue.instrument_after(instrument_job) ;
    count += slave_init_queue.instrument_after(instrument_job) ;
    count += slave_pre_queue.instrument_after(instrument_job) ;
    count += slave_post_queue.instrument_after(instrument_job) ;
    count += slave_shutdown_queue.instrument_after(instrument_job) ;

    /** @li Return how many insertions were done. */
    return(count) ;

}


int Trick::MonteCarlo::instrument_job_remove( std::string in_job) {

    master_init_queue.instrument_remove(in_job) ;
    master_pre_queue.instrument_remove(in_job) ;
    master_post_queue.instrument_remove(in_job) ;
    master_shutdown_queue.instrument_remove(in_job) ;
    slave_init_queue.instrument_remove(in_job) ;
    slave_pre_queue.instrument_remove(in_job) ;
    slave_post_queue.instrument_remove(in_job) ;
    slave_shutdown_queue.instrument_remove(in_job) ;

    return(0) ;
}

int Trick::MonteCarlo::write_s_job_execution(FILE *fp) {
    if (fp == NULL) {
        return(0);
    }

    fprintf(fp, "\n===================================================================================================\n") ;
    fprintf(fp, "MonteCarlo Loop:\n\n") ;
    master_init_queue.write_sched_queue(fp) ;
    master_pre_queue.write_sched_queue(fp) ;
    master_post_queue.write_sched_queue(fp) ;
    master_shutdown_queue.write_sched_queue(fp) ;
    slave_init_queue.write_sched_queue(fp) ;
    slave_pre_queue.write_sched_queue(fp) ;
    slave_post_queue.write_sched_queue(fp) ;
    slave_shutdown_queue.write_sched_queue(fp) ;

    return 0;
}