#!/bin/bash

# doc deploy_trackid {
#
# DESCRIPTION
#   deploy_trackid - Deploys TRACKID of IMAGEID to TARGET
#
# USAGE
#   deploy_trackid <path/to/git/dir> <path/to/target> <path/to/db/file> <IMAGEID> <TRACKID>
#
# }

deploy_trackid() {
    ## Argument parsing
    local GIT_DIR="${1}"
    local TARGET="${2}"
    local DB_FILE="${3}"
    local IMAGEID="${4}"
    local TRACKID="${5}"

    local TRACKNO="$(print_track_no ${GIT_DIR} ${IMAGEID} ${TRACKID})"

    ## Path and metadata parsing 
    local FUTURE_META="$(print_future_meta ${GIT_DIR}/${IMAGEID}.tags ${TRACKNO})"
    local FUTURE_PATH="$(print_future_path ${FUTURE_META}})"
    local PRESENT_PATH="$(print_present_path ${DB_FILE} ${IMAGEID} ${TRACKID})"
    local PRESENT_META="$(print_present_meta "${TARGET}/${PRESENT_PATH}")"
    local ROW_NO=$(awk -v imageid=${IMAGEID} -v trackid=${TRACKID} 'BEGIN{FS="\t"}{if($2==imageid && $3==trackid){print NR}}' ${DB_FILE})

    # If the track is selected, we will check if the trackid has already been deployed, if not deploy. If the metadata to be
    # applied is different than what's deployed, apply new metadata. If the path has changed, move file to new path.
    if is_selected ${DB_FILE} ${IMAGEID} ${TRACKID}; then
            
        # In the event that PRESENT_PATH is null, that is to say the trackid is not present on target, transfers it there and then defined the PRESENT_PATH as the transfered FLAC
        if [[ "${PRESENT_PATH}" == "null" ]]; then
            _msg ECHO "${TRACKID} is not deployed. Deploying"
            mv "${GIT_DIR}/${IMAGEID}-${TRACKID}.flac" "${TARGET}/${IMAGEID}-${TRACKID}.flac"
            PRESENT_PATH="${IMAGEID}-${TRACKID}.flac"
        fi    
    
        # If the PRESENT_META and FUTURE_META diverge, wipe the old metadata, and reapply
        if [[ "${PRESENT_META}" != "${FUTURE_META}" ]]; then
            _msg ECHO "${TRACKID} has differing metadata. Updating"
            [[ "${PRESENT_PATH}" == "null" ]] || metaflac --remove-all "${TARGET}/${PRESENT_PATH}"
            awk 'BEGIN {RS=";"}{print $0}' <<< ${FUTURE_META} | head -n -1 | metaflac --import-tags-from=- --import-picture-from="${GIT_DIR}/${IMAGEID}.jpg" "${TARGET}/${PRESENT_PATH}"
        fi 

        # If the PRESENT_PATH and FUTURE_PATH diverge, move to new location
        if [[ "${PRESENT_PATH}" != "${FUTURE_PATH}" ]]; then
            _msg ECHO "${TRACKID} has differing paths. Moving"
            mkdir -p "$(dirname "${TARGET}/${FUTURE_PATH}")"
            mv "${TARGET}/${PRESENT_PATH}" "${TARGET}/${FUTURE_PATH}"
            rmdir -p --ignore-fail-on-non-empty "$(dirname "${TARGET}/${PRESENT_PATH}")"
            awk -v rowno=${ROW_NO} -v value="${FUTURE_PATH}" 'BEGIN{FS="\t";OFS="\t"}{if(NR==rowno){$4=value}{print $0}}' ${DB_FILE} > ${DB_FILE}.tmp; mv ${DB_FILE}.tmp ${DB_FILE}
        fi

    else
        if [[ ${PRESENT_PATH} != "null" ]]; then
            _msg ECHO "${TARGETID} was previouslty selected, and is now unselected. Deleting"
            rm "${TARGET}/${PRESENT_PATH}"
            awk -v rowno=${ROW_NO} -v value=null 'BEGIN{FS="\t";OFS="\t"}{if(NR==rowno){$4=value}{print $0}}' ${DB_FILE} > ${DB_FILE}.tmp;  mv ${DB_FILE}.tmp ${DB_FILE}
        else
            _msg ECHO "${TARGETID} not selected"
            rm "${GIT_DIR}/${IMAGEID}-${TRACKID}.flac"
        fi 
    fi
}