/*******************************************************************************
#                                                                              #
#      MJPG-streamer allows to stream JPG frames from an input-plugin          #
#      to several output plugins                                               #
#                                                                              #
#      Copyright (C) 2007 Tom Stöveken                                         #
#                                                                              #
# This program is free software; you can redistribute it and/or modify         #
# it under the terms of the GNU General Public License as published by         #
# the Free Software Foundation; version 2 of the License.                      #
#                                                                              #
# This program is distributed in the hope that it will be useful,              #
# but WITHOUT ANY WARRANTY; without even the implied warranty of               #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                #
# GNU General Public License for more details.                                 #
#                                                                              #
# You should have received a copy of the GNU General Public License            #
# along with this program; if not, write to the Free Software                  #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA    #
#                                                                              #
*******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <signal.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <getopt.h>
#include <pthread.h>
#include <fcntl.h>
#include <time.h>
#include <syslog.h>

#include "../../utils.h"
#include "../../mjpg_streamer.h"

#include "processJPEG_onlyCenter.h"

#define OUTPUT_PLUGIN_NAME "autofocus output plugin"

static pthread_t worker;
static globals *pglobal;
static int fd, delay;
static unsigned char *frame = NULL;
static int input_number;

/******************************************************************************
Description.: print a help message
Input Value.: -
Return Value: -
******************************************************************************/
void help(void)
{
    fprintf(stderr, " ---------------------------------------------------------------\n" \
            " Help for output plugin..: "OUTPUT_PLUGIN_NAME"\n" \
            " ---------------------------------------------------------------\n" \
            " The following parameters can be passed to this plugin:\n\n" \
            " [-d | --delay ].........: delay after saving pictures in ms\n" \
            " ---------------------------------------------------------------\n");
}

/******************************************************************************
Description.: clean up allocated ressources
Input Value.: unused argument
Return Value: -
******************************************************************************/
void worker_cleanup(void *arg)
{
    static unsigned char first_run = 1;

    if(!first_run) {
        DBG("already cleaned up ressources\n");
        return;
    }

    first_run = 0;
    OPRINT("cleaning up ressources allocated by worker thread\n");

    free(frame);
    close(fd);
}



/******************************************************************************
Description.: this is the main worker thread
              it loops forever, grabs a fresh frame and calculates focus
Input Value.:
Return Value:
******************************************************************************/
void *worker_thread(void *arg)
{
    int frame_size = 0;
    double sv = -1.0, max_sv = 100.0, delta = 500;
    int focus = 255, step = 10, max_focus = 100, search_focus = 1;

    if((frame = malloc(256 * 1024)) == NULL) {
        OPRINT("not enough memory for worker thread\n");
        exit(EXIT_FAILURE);
    }

    /* set cleanup handler to cleanup allocated ressources */
    pthread_cleanup_push(worker_cleanup, NULL);

    while(!pglobal->stop) {
        DBG("waiting for fresh frame\n");
        pthread_mutex_lock(&pglobal->in[input_number].db);
        pthread_cond_wait(&pglobal->in[input_number].db_update, &pglobal->in[input_number].db);

        /* read buffer */
        frame_size = pglobal->in[input_number].size;
        memcpy(frame, pglobal->in[input_number].buf, frame_size);

        pthread_mutex_unlock(&pglobal->in[input_number].db);

        /* process frame */
        sv = getFrameSharpnessValue(frame, frame_size);
        DBG("sharpness is: %f\n", sv);

        if(search_focus || (ABS(sv - max_sv) > delta)) {
            DBG("adjusting focus: %d\n", focus);

            /* entered because focus changed */
            if(!search_focus) {
                DBG("starting to search for focus\n");
                max_focus    = 255;
                focus        = 255;
                max_sv       = -1.0;
                search_focus = 1;
            }

            if(focus <= 0) {
                focus = max_focus;
                DBG("max focus found at: %d\n", max_focus);
                search_focus = 0;
            }

            if(search_focus) {
                if(sv > max_sv) {
                    /* sharpness is better then max now */
                    DBG("found better focus at: %d\n", focus);
                    max_focus = focus;
                    max_sv = sv;
                }

                focus = MIN(MAX(focus - step, 0), 255);
                DBG("decrement focus now to: %d\n", focus);
                //focus = pglobal->in.cmd(IN_CMD_FOCUS_SET, focus);
            }
        }

        if((delay > 0) && !search_focus) {
            usleep(1000 * delay);
        }
    }

    pthread_cleanup_pop(1);

    return NULL;
}

/*** plugin interface functions ***/
/******************************************************************************
Description.: this function is called first, in order to initialise
              this plugin and pass a parameter string
Input Value.: parameters
Return Value: 0 if everything is ok, non-zero otherwise
******************************************************************************/
int output_init(output_parameter *param)
{
    int i;

    delay = 10000;

    param->argv[0] = OUTPUT_PLUGIN_NAME;

    /* show all parameters for DBG purposes */
    for(i = 0; i < param->argc; i++) {
        DBG("argv[%d]=%s\n", i, param->argv[i]);
    }

    reset_getopt();
    while(1) {
        int option_index = 0, c = 0;
        static struct option long_options[] = {
            {"h", no_argument, 0, 0
            },
            {"help", no_argument, 0, 0},
            {"d", required_argument, 0, 0},
            {"delay", required_argument, 0, 0},
            {"i", required_argument, 0, 0},
            {"input", required_argument, 0, 0},
            {0, 0, 0, 0}
        };

        c = getopt_long_only(param->argc, param->argv, "", long_options, &option_index);

        /* no more options to parse */
        if(c == -1) break;

        /* unrecognized option */
        if(c == '?') {
            help();
            return 1;
        }

        switch(option_index) {
            /* h, help */
        case 0:
        case 1:
            DBG("case 0,1\n");
            help();
            return 1;
            break;

            /* d, delay */
        case 2:
        case 3:
            DBG("case 2,3\n");
            delay = atoi(optarg);
            break;
            /* i input */
        case 4:
        case 5:
            input_number = atoi(optarg);
            break;
        }
    }

    pglobal = param->global;

    OPRINT("delay.............: %d\n", delay);
    return 0;
}

/******************************************************************************
Description.: calling this function stops the worker thread
Input Value.: -
Return Value: always 0
******************************************************************************/
int output_stop(int id)
{
    DBG("will cancel worker thread\n");
    pthread_cancel(worker);
    return 0;
}

/******************************************************************************
Description.: calling this function creates and starts the worker thread
Input Value.: -
Return Value: always 0
******************************************************************************/
int output_run(int id)
{
    DBG("launching worker thread\n");
    pthread_create(&worker, 0, worker_thread, NULL);
    pthread_detach(worker);
    return 0;
}
