#!/bin/bash

set -o pipefail
set -u

# -----------------------------------------------------------------------------
# Nextcloud synchronization script
#
# Usage:
#   sync.sh [OPTIONS]
#
# -----------------------------------------------------------------------------

SERVER="https://cloud.someoneslinux.selfhost.eu"
#[[ "$(hostname)" == "mediahost" ]] && SERVER="https://localhost"
NETRC="/home/lucas/.netrc"
SYNC_LOG="${HOME}/sync.log"
SYNC_MARKER="/tmp/nextcloud_sync"

MAX_RETRIES=3
RETRY_DELAY=5

SILENT=true
SYNC_MEMES=1
SYNC_AUDIOBOOKS=1
SYNC_RECIPIES=1
SYNC_ALINA=1
SYNC_ALINA_DROP=1
SYNC_WALLPAPER=1
SYNC_CAMERA=1
SYNC_SYNCFOLDER=1

usage() {
    cat <<EOF
Usage: ${0##*/} [OPTIONS]

Synchronize configured directories with Nextcloud.

Options:
  -h, --help    Show this help message and exit
  -l            Show synchronization output
  -d            Enable Alina Share synchronization
  -c            Enable Camera synchronization
  -w            Enable Wallpaper synchronization
  -m            Enable Memes synchronization
  -s            Enable Syncfolder synchronization
  -ab           Enable Audiobook synchronization
  -al           Enable Alina synchronization
  -all          Enable all synchronization operations
  -del          Remove the Nextcloud sync marker
  --version     Show script version

Examples:
  ${0##*/}              Run the default synchronization
  ${0##*/} -l           Run with live output
  ${0##*/} -c -ab       Sync everything except camera and audiobooks
  ${0##*/} -h           Show this help
EOF
}

die() {
    echo "Error: $*" >&2
    echo
    usage >&2
    exit 2
}

run_cmd() {
    if [[ "$SILENT" == "true" ]]; then
        "$@" >"$SYNC_LOG" 2>&1
    else
        "$@" 2>&1 | tee "$SYNC_LOG"
    fi
}

sync_directory() {
    local name="$1"
    local remote_path="$2"
    local local_path="$3"

    echo "Sync ${name}"

    run_cmd nextcloudcmd \
        --trust \
        -n \
        --logdebug \
        --path "$remote_path" \
        "$local_path" \
        "$SERVER"
}

parse_args() {
    while [[ $# -gt 0 ]]; do
        case "$1" in
            -h|--help)
                usage
                exit 0
                ;;

            --version)
                echo "${0##*/} 1.0"
                exit 0
                ;;

            -l)
                SILENT=false
                ;;

            -w)
                SYNC_WALLPAPER=0
                ;;

            -d)
                SYNC_ALINA_DROP=0
                ;;

            -s)
                SYNC_SYNCFOLDER=0
                ;;

            -c)
                SYNC_CAMERA=0
                ;;

            -ab)
                SYNC_AUDIOBOOKS=0
                ;;

            -m)
                SYNC_MEMES=0
                ;;

            -al)
                SYNC_ALINA=0
                ;;

            -all)
                SYNC_AUDIOBOOKS=0
                SYNC_RECIPIES=0
                SYNC_ALINA=0
                SYNC_MEMES=0
                SYNC_ALINA_DROP=0
                SYNC_WALLPAPER=0
                SYNC_CAMERA=0
                ;;

            -del)
                if [[ -f "$SYNC_MARKER" ]]; then
                    rm -f "$SYNC_MARKER"
                    echo "Sync marker removed: $SYNC_MARKER"
                else
                    echo "Sync marker does not exist: $SYNC_MARKER"
                fi
                ;;

            -*)
                die "Unknown option: $1"
                ;;

            *)
                die "Unexpected argument: $1"
                ;;
        esac

        shift
    done
}

validate_sync_options() {
    if (( SYNC_AUDIOBOOKS == 1 &&
          SYNC_RECIPIES == 1 &&
          SYNC_ALINA == 1 &&
          SYNC_MEMES == 1 &&
          SYNC_SYNCFOLDER == 1 &&
          SYNC_ALINA_DROP == 1 &&
          SYNC_WALLPAPER == 1 &&
          SYNC_CAMERA == 1 )); then

        die "No synchronization target selected."
    fi
}

sync_all() {
    local ret=0
    local attempt=1

    while (( attempt <= MAX_RETRIES )); do
        ret=0

        if (( SYNC_AUDIOBOOKS == 0 )); then
            sync_directory \
                "Audiobooks" \
                "Audiobooks/" \
                "/data/nextcloud/syncuser/Audiobooks"
            (( ret += $? ))
        fi

        if (( SYNC_SYNCFOLDER == 0 )); then
            sync_directory \
                "Syncfolder" \
                "Syncfolder/" \
                "/data/nextcloud/syncuser/Syncfolder"
            (( ret += $? ))
        fi
        if (( SYNC_ALINA_DROP == 0 )); then
            sync_directory \
                "Alina Share" \
                "Alina Share/" \
                "/data/nextcloud/syncuser/alina"
            (( ret += $? ))
        fi

        if (( SYNC_MEMES == 0 )); then
            sync_directory \
                "Memes" \
                "Memes/" \
                "/data/nextcloud/syncuser/Memes"
            (( ret += $? ))
        fi
        
        if (( SYNC_ALINA == 0 )); then
            sync_directory \
                "Alina" \
                "Wachstum" \
                "/data/nextcloud/syncuser/Wachstum"
            (( ret += $? ))
        fi

        if (( SYNC_RECIPIES == 0 )); then
            sync_directory \
                "Recipes" \
                "RecepiesLucas" \
                "/data/nextcloud/syncuser/RecepiesLucas"
            (( ret += $? ))
        fi

        if (( SYNC_CAMERA == 0 )); then
            sync_directory \
                "Camera" \
                "Camera" \
                "/data/nextcloud/syncuser/camera"
            (( ret += $? ))
        fi

        if (( SYNC_WALLPAPER == 0 )); then
            sync_directory \
                "Wallpaper" \
                "Wallpaper" \
                "/data/nextcloud/syncuser/WallpaperChanger"
            (( ret += $? ))
        fi

        if (( ret == 0 )); then
            echo "Success"
            return 0
        fi

        if (( attempt < MAX_RETRIES )); then
            echo "Sync failed (attempt ${attempt}/${MAX_RETRIES}). Retrying in ${RETRY_DELAY}s..."
            sleep "$RETRY_DELAY"
        fi

        ((attempt++))
    done

    echo "Sync failed after ${MAX_RETRIES} attempts."
    return 1
}

main() {
    parse_args "$@"
    validate_sync_options

    if ! command -v nextcloudcmd >/dev/null 2>&1; then
        die "nextcloudcmd is not installed or not in PATH"
    fi

    if [[ ! -r "$NETRC" ]]; then
        die "Cannot read credentials file: $NETRC"
    fi

    if pgrep -x "nextcloudcmd" >/dev/null; then
        echo "Nextcloud sync is already active, stopping."
        return 0
    fi

    echo "Starting Nextcloud synchronization..."

    sync_all
}

main "$@"
exit $?