#!/bin/bash
# Transmission-related functions for torrent-mover

# get_destination: Maps a source directory to a destination directory based on keywords and patterns
get_destination() {
    local source_path="$1"
    
    # Check if source_path is valid before accessing the array
    if [[ -z "${source_path}" ]]; then
        log_warn "Empty source path provided to get_destination"
        return "${DEFAULT_DST}"
    fi
    
    # Check if path is already in the cache
    if [[ -n "${PATH_CACHE["${source_path}"]+x}" ]]; then
        local cached_destination="${PATH_CACHE["${source_path}"]}"
        log_debug "Using cached destination for ${source_path}: ${cached_destination}"
        echo "${cached_destination}"
        return
    fi
    
    # Skip recursive path analysis - only log once
    if [[ "${source_path}" =~ ^/mnt/dsnas1/ ]]; then
        # Already in destination format, return as is
        log_debug "Path already in destination format: ${source_path}"
        PATH_CACHE["${source_path}"]="${source_path}"
        echo "${source_path}"
        return
    fi
    
    # For paths in dsnas2, check if they map to same structure in dsnas1
    if [[ "${source_path}" =~ ^/mnt/dsnas2/ ]]; then
        local dir_suffix="${source_path#/mnt/dsnas2/}"
        local potential_dest="/mnt/dsnas1/${dir_suffix}"
        
        # If the directories match exactly in structure, only on different mounts,
        # return the source to avoid needless copying
        if [[ -d "${potential_dest}" ]]; then
            log_debug "Path maps to same structure on different mount: ${source_path} -> ${source_path}"
            PATH_CACHE["${source_path}"]="${source_path}"
            echo "${source_path}"
            return
        fi
    fi
    
    log_info "Analyzing path: ${source_path}"
    local destination="${DEFAULT_DST}"
    
    # Match using custom patterns from config file if they exist
    if [[ -n "${CUSTOM_PATTERNS}" ]]; then
        log_debug "Using custom patterns from config..."
        # Parse and apply each pattern
        IFS=';' read -ra PATTERN_ARRAY <<< "${CUSTOM_PATTERNS}"
        for pattern in "${PATTERN_ARRAY[@]}"; do
            IFS='=' read -ra PARTS <<< "${pattern}"
            if [[ "${#PARTS[@]}" -eq 2 ]]; then
                local regex="${PARTS[0]}"
                local dest="${PARTS[1]}"
                if [[ "${source_path,,}" =~ ${regex,,} ]]; then
                    log_info "Custom pattern match: ${regex} -> ${dest}"
                    destination="${dest}"
                    break
                fi
            fi
        done
    fi
    
    # If no custom pattern matched, use default category mapping
    if [[ "${destination}" == "${DEFAULT_DST}" ]]; then
        case "${source_path,,}" in
            *games*) destination="${DIR_GAMES_DST}";;
            *apps*|*applications*|*programs*|*software*) destination="${DIR_APPS_DST}";;
            *movies*|*film*|*video*) destination="${DIR_MOVIES_DST}";;
            *books*|*ebook*|*pdf*|*epub*) destination="${DIR_BOOKS_DST}";;
            *tv*|*series*|*episode*) 
                if [[ -n "${DIR_TV_DST}" ]]; then
                    destination="${DIR_TV_DST}"
                else
                    destination="${DIR_MOVIES_DST}"
                fi
                ;;
            *music*|*audio*|*mp3*|*flac*) 
                if [[ -n "${DIR_MUSIC_DST}" ]]; then
                    destination="${DIR_MUSIC_DST}"
                else
                    destination="${DEFAULT_DST}"
                fi
                ;;
        esac
    fi
    
    log_info "Mapped to: ${destination}"
    
    # Only set in cache if source_path is not empty
    if [[ -n "${source_path}" ]]; then
        PATH_CACHE["${source_path}"]="${destination}"
    fi
    
    echo "${destination}"
}

# process_removal: Removes a torrent via Transmission.
process_removal() {
    local id="$1"
    if (( DRY_RUN )); then
        log_info "[DRY RUN] Would remove torrent ${id}"
        return
    fi
    
    local cmd="transmission-remote ${TRANSMISSION_IP}:${TRANSMISSION_PORT} -n ${TRANSMISSION_USER}:${TRANSMISSION_PASSWORD} -t ${id} --remove-and-delete"
    retry_command "$cmd" 3 15
}

# get_torrents: Retrieves a list of torrents from Transmission
get_torrents() {
    local cmd="transmission-remote ${TRANSMISSION_IP}:${TRANSMISSION_PORT} -n ${TRANSMISSION_USER}:${TRANSMISSION_PASSWORD} -l"
    log_debug "Running command: $cmd"
    local output
    output=$(retry_command "$cmd" 3 20)
    
    # Extract IDs directly using awk
    # Skip the header line (NR>1) and print the first column
    # The IDs are right-aligned with spaces in front, so we need to trim them
    echo "$output" | awk 'NR>1 && NF>1 {gsub(/^[ ]+/, "", $1); if ($1 ~ /^[0-9]+$/) print $1}'
}

# get_torrent_info: Gets detailed info for a specific torrent
get_torrent_info() {
    local id="$1"
    local cmd="transmission-remote ${TRANSMISSION_IP}:${TRANSMISSION_PORT} -n ${TRANSMISSION_USER}:${TRANSMISSION_PASSWORD} -t ${id} -i"
    retry_command "$cmd" 3 15
}