#!/bin/bash

########### SUDO COMMANDS WITHOUT PASSWORD #############################################
# 
# Specific commands must be executable without sudo
# 
# Add to sudoers file (sudo visudo):
# 
# Disable password for specific commands
# pi ALL=(ALL:ALL) NOPASSWD: /usr/bin/chmod -R 755 /data/public/capserver/images
# pi ALL=(ALL:ALL) NOPASSWD: /usr/bin/mv /home/pi/classifier.mlmodel /data/public/capserver/
# pi ALL=(ALL:ALL) NOPASSWD: /usr/bin/mv /home/pi/classifier.version /data/public/capserver/
# pi ALL=(ALL:ALL) NOPASSWD: /usr/bin/chown -R www-data\:www-data /data/public/capserver/
#
########################################################################################

########### EXPLANATION OF RSYNC FLAGS #################################################
# 
# -h human readable output
# -v verbose output
# -r recursive
# -P print information about long-running transfers, keep partial files (—-progress --partial)
# -t preserves modification times
# -u only update if newer
# 
########################################################################################

########### PATHS ######################################################################

WORK_DIR="/Users/imac/Projects/CapCollectorData"
BACKUP_DIR="${WORK_DIR}/Backup"
IMAGE_DIR="${WORK_DIR}/images"
VERSION_FILE="${WORK_DIR}/classifier.version"
MODEL_FILE="${WORK_DIR}/classifier.mlmodel"

TRAINING_ITERATIONS="17"
SSH_PORT="5432"
SERVER="pi@pi4"
SERVER_ROOT_PATH="/data/public/capserver"

########################################################################################

echo "[INFO] Working in directory ${WORK_DIR}"

echo "[INFO] Getting classifier version from server..."
scp -P $SSH_PORT ${SERVER}:/${SERVER_ROOT_PATH}/classifier.version $WORK_DIR

# Read classifier version from file
OLD_VERSION=$(< $VERSION_FILE)
NEW_VERSION=$(($OLD_VERSION + 1))
echo "[INFO] Creating classifier version ${NEW_VERSION}" 

echo "[INFO] Ensuring permissions for images on server..."
ssh -p $SSH_PORT ${SERVER} "sudo chmod -R 755 ${SERVER_ROOT_PATH}/images"

echo "[INFO] Transferring images from server..."
rsync -hvrPut -e "ssh -p ${SSH_PORT}" ${SERVER}:/${SERVER_ROOT_PATH}/images/ "${IMAGE_DIR}"

echo "[INFO] Training the model..."
swift train.swift $IMAGE_DIR $TRAINING_ITERATIONS $MODEL_FILE

echo "[INFO] Backing up model..."
cp $MODEL_FILE "${BACKUP_DIR}/classifier${NEW_VERSION}.mlmodel"

echo "[INFO] Incrementing version file..."
echo "${NEW_VERSION}" > $VERSION_FILE

echo "[INFO] Copying the files to the server..."
scp -P $SSH_PORT $MODEL_FILE $VERSION_FILE ${SERVER}:~/

echo "[INFO] Moving files into public directory..."
ssh -p ${SSH_PORT} ${SERVER} "sudo mv /home/pi/classifier.* ${SERVER_ROOT_PATH}/"

echo "[INFO] Updating permissions..."
ssh -p ${SSH_PORT} ${SERVER} "sudo chown -R www-data\:www-data ${SERVER_ROOT_PATH}/"

echo "[INFO] Cleaning up..."
rm $MODEL_FILE $VERSION_FILE

echo "[INFO] Process finished"