#!/bin/bash

# doc db_set {
#
# DESCRIPTION
#   db_set - Command selects or deslects all TRACKIDs that matches the CONDITION
#
# USAGE
#   db_set </path/to/git/dir> </path/to/db/file> <BOULEAN> <condition> [<...>]
#
# CONDITIONS
#   CONDITIONS are defined using the following format:
#       <metadata field>=<value>
#   The metadata field can be anything that can be injected as metadata in a Vorbis or id3tag. 
#
# }

db_set() {
    local GIT_DIR="${1}"
    local DB_FILE="${2}"
    local SELECTED="${3}"; shift 3
    local CONDITION="${@}"
    
    if [[ "${CONDITION}" == "all" ]]; then
        gawk -i inplace -v selected=${SELECTED} 'BEGIN{FS="\t";OFS="\t";}{if($1!="LAST_DEPLOY" && $1!="LAST_UPDATE" && $1!="REPO_ID" && $1!="null"){$1=selected}{print $0}}' "${DB_FILE}"
        cat "${DB_FILE}"
        return 0
    fi

    # Defines what imageids are imported into database, as we're only going to act on those
    local FIELD="$(echo ${CONDITION} | cut -d'=' -f1 | tr '[:lower:]' '[:upper:]' )"
    local VALUE="$(echo ${CONDITION} | cut -d'=' -f2 | tr '[:lower:]' '[:upper:]' )"
       
    # Determines which IMAGEIDs present in the DB_FILE match the CONDITION
    local COUNT=1
    local dbimageidList=$(awk 'BEGIN{FS="\t"}{if($1!="LAST_DEPLOY" && $1!="LAST_UPDATE" && $1!="REPO_ID" && $1!="null"){print $2}}' ${DB_FILE} | awk '!seen[$0]++')
    for dbimageid in ${dbimageidList[@]}; do
        local MTAG="$(printf "${GIT_DIR}/%s.tags" ${dbimageid})"
        local MATCH="$(grep -i -l "\"${FIELD}\" : \"${VALUE}\""  "${MTAG}")"
        local imageidList[${COUNT}]="$(basename -s .tags ${MATCH} 2>/dev/null)"
        local COUNT=$(( ${COUNT} + 1 ))
    done

    # Goes through imageidList to determine which TRACKID matches the CONDITION
    for imageid in ${imageidList[@]}; do

        # Defines TOTALTRACKS of IMAGEID
        local TOTALTRACKS=$(grep "@" ${GIT_DIR}/${imageid}.tags | wc -l)

        # Loop goes through all of the tracks in IMAGEID, and determines which of the TRACKIDs has a FIELD that matches the VALUE
        local COUNT=1
        while [[ ${COUNT} -le ${TOTALTRACKS} ]]; do

            local TRACK_VALUE=$(print_meta_mtag "${GIT_DIR}/${imageid}.tags" ${COUNT} ${FIELD} | cut -d'=' -f2 | sed 's|.$||' | tr '[:lower:]' '[:upper:]')
            # If print_meta_mtag extract the same VALUE from FIELD as the CONDITION, the TRACKID of this TRACK is added into trackidList
            if [[ "${TRACK_VALUE}" == "${VALUE}" ]]; then
                local TRACKID=$(print_meta_mtag "${GIT_DIR}/${imageid}.tags" ${COUNT} TRACKID |  cut -d'=' -f2 | sed 's|.$||')
                _msg ECHO "Track ${COUNT} of ${imageid} matches condition. Adding to trackidList"
                local trackidList[${COUNT}]="${TRACKID}"
            fi

            local COUNT=$(( ${COUNT} + 1 ))
        done 
            
        # Changes state of trackids that matched
        for trackid in ${trackidList[@]}; do
            awk -v imageid=${imageid} -v selected=${SELECTED} -v trackid=${trackid} 'BEGIN{FS="\t";OFS="\t"}{if($2==imageid && $3==trackid){$1=selected}{print $0}}' ${DB_FILE}  > ${DB_FILE}.tmp; mv ${DB_FILE}.tmp ${DB_FILE}
        done
    done
}