# !/bin/bash -

source ./general_utils
source ./log_helpers
source ./git_helpers
source ./update_psa_helpers
source ./read_config

update_psa() {
    local try_update_count=0
    local func="${FUNCNAME[0]}"

    # read config parameters
    # read_config
                
    log_debug "$func:${LINENO}: fetch/merge updates..."
   
    # Fetch new updates (using git)
    while :
    do
        local repository_is_already_up_to_date=""
        if ! fetch_customer_updates repository_is_already_up_to_date; then
            if [ "$repository_is_already_up_to_date" = "yes" ]; then
                log_error "$func:${LINENO}: $customer_id is up-to-date"\
                    "-> no files to update -> no psa update"
                exit 1
            fi
            try_updates_count=$((try_updates_count+1))
            if [[ "$try_updates_count" -eq 5 ]]; then
                log_error "$func:${LINENO}: fetch/merging failed" ; exit 1
            fi
            sleep 60s
        else
            # Fetched updates successfully 
            try_updates_count=0
            break
        fi
    done

    # TODO: backup implementieren
    # Backup before any updates in case some previous test was wrong
    if ! backup_previous_version; then
        log_error "$func:${LINENO}: backup failed"
        revert_customer_repository ; exit 1
    fi

    local changed_files=$(changed_file_names)
    local conf_ini_files=$(filter_conf_ini_files "$changed_files")

    # check if *.conf and/or *.ini-files have to md5-sum as denoted
    # in update.conf
    if ! check_md5_for_changed_conf_and_ini_files "$conf_ini_files" ; then
        log_error "$func:${LINENO}: new customer files wrong"
        revert_customer_repository ; exit 1
    fi
    
    # copy *.conf and/or *.ini-files to their corresponding system-directories
    if ! copy $conf_ini_files; then
        log_error "$func:${LINENO}: copy operation failed"
        revert_customer_repository ; exit 1
    fi

    # check if the opkg-command-file has been changed during 'git pull'
    if grep -qE ".*opkg_commands.*?" <<< $changed_files; then
        # read opkg_cmds: each line respresents an opkg-command
        readarray opkg_commands < <(cat $opkg_cmds_file)
        for opkg_c in "${opkg_commands[@]}"; do
            if grep -qE "^\s*[#]+.*$" <<< $opkg_c; then
                continue    # found comment line
            fi

            # package manipulation commands without package:
            local cwp="update|upgrade|clean"
            # informational commands without package:
            cwp="${cwp}|list|list-installed|list-upgradable"

            if grep -qE "^.*\s+($cwp)\s+.*$" <<< $opkg_c; then
                local p=$(printf '%s' "$opkg_c" | awk '{ print $NF }')
                local opkg_output=()
                if ! exec_opkg_info "$p" opkg_output; then
                    log_error "$func:${LINENO}: opkg info $opkg_c failed"
                    revert_customer_repository ; exit 1
                fi

                if ! check_md5_for_opkg_packages opkg_output; then
                    log_error "$func:${LINENO}: "\
                        "wrong md5sum for opkg packages"
                    revert_customer_repository ; exit 1
                fi
            fi
            
            # perform a dry-run and check if everything might work as expected. 
            if ! exec_opkg_noaction $opkg_c; then
                    log_error "$func:${LINENO}: "\
                        "opkg --noaction $opkg_c failed"
            fi

            # Actually execute the opkg command
            if ! exec_opkg $opkg_c; then
                log_error "$func:${LINENO}: exec_opkg $opkg_c failed"
                fallback_to_previous_version
                revert_customer_repository ; exit 1
            fi
        done
    else
        log_info "$func:${LINENO}: no opkg commnds to execute"
    fi
    
    # Cleanup.
    if ! cleanup_previous_version; then
        log_error "$func:${LINENO}: cleanup_previous_version failed"
    fi
            
    log_info "$func:${LINENO}: success"
    exit 0
}