#!/bin/bash

databaseAppScan() 
{
    # Check if sqlite3 is available
    if ! command -v sqlite3 &> /dev/null; then
        isNotice "sqlite3 command not found. Make sure it's installed."
    fi

    # Check if database file is available
    if [ ! -f "$docker_dir/$db_file" ] ; then
        isNotice "Database file not found. Make sure it's installed."
    fi

    isHeader "Scanning Docker folder for apps"

    # Check if the folder exists
    if [ ! -d "$containers_dir" ]; then
        checkSuccess "Install path not found or not a directory: $containers_dir"
    fi

    # Scan the folder and retrieve folder names
    local folder_names=$(runFileOp find "$containers_dir" -mindepth 1 -maxdepth 1 -type d -exec basename {} \;)

    # Check if no folders are found
    if [ -z "$folder_names" ]; then
        checkSuccess "No apps found."
    fi

    # Initialize the updated_count variable to keep track of updates made to the database
    local updated_count=0

    # Get the list of all folder names and statuses from the database
    local existing_folders=$(runInstallOp sqlite3 "$docker_dir/$db_file" "SELECT name, status, uninstall_date FROM apps;")

    # Create an array to store existing folder names in the database
    local existing_folder_names=()
    while IFS='|' read -r folder_name status uninstall_date; do
        if [[ -n "$folder_name" ]]; then
            existing_folder_names+=("$folder_name")
            # Check if the folder exists in the containers_dir
            if [ -d "$containers_dir/$folder_name" ]; then
                if (( status == 0 )); then 
                    isNotice "The folder for $folder_name has been found."
                    # Update the database to set the status to 1 (installed) and unset the uninstall_date
                    local result; result=$(runInstallOp sqlite3 "$docker_dir/$db_file" "UPDATE apps SET status = 1, uninstall_date = NULL WHERE name = '$folder_name';")
                    checkSuccess "Updating apps database for $folder_name to installed status."
                    ((updated_count++)) # Increment updated_count
                fi
            fi
        fi
    done <<< "$existing_folders"

    # Loop through immediate subdirectories of $containers_dir
    for app_dir in "$containers_dir"/*/; do
        # Get the app name from the folder name
        local app_name=$(basename "$app_dir")

        # Check if the app name is not already in the database
        if ! [[ " ${existing_folder_names[@]} " =~ " $app_name " ]]; then
            # Check if the folder contains a valid .config file
            if [ -f "$app_dir/$app_name.config" ]; then
                # Extract the date and time from the folder name (if present)
                local folder_datetime=$(echo "$app_name" | grep -oE '[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}')
                if [ -z "$folder_datetime" ]; then
                    # If no date and time are found in the folder name, use the current date and time
                    local folder_datetime=$(date "+%Y-%m-%d %H:%M:%S")
                fi

                # Split folder_datetime into date and time variables
                local folder_date=$(echo "$folder_datetime" | awk '{print $1}')
                local folder_time=$(echo "$folder_datetime" | awk '{print $2}')

                # Add the new entry to the database with a default status of 1 (installed) and the extracted or current date
                local result; result=$(runInstallOp sqlite3 "$docker_dir/$db_file" "INSERT INTO apps (name, status, install_date, install_time) VALUES ('$app_name', 1, '$folder_date', '$folder_time');")
                checkSuccess "Adding $app_name to the apps database."
                ((updated_count++)) # Increment updated_count
            fi
        fi
    done

    # Create an array to store folder names that should be removed from the database
    local folders_to_remove=()

    # Get a list of folder names that exist in the database but not in the current folder structure
    for folder_name in "${existing_folder_names[@]}"; do
        if [ ! -d "$containers_dir/$folder_name" ]; then
            local folders_to_remove+=("$folder_name")
        fi
    done

    # Get a list of folder names that exist in the database but not in the current folder structure
    for folder_name in "${existing_folder_names[@]}"; do
        if [ ! -d "$containers_dir/$folder_name" ]; then
            # Check if this folder is actually associated with an entry in the database
            if [[ " ${folder_names[@]} " =~ " $folder_name " ]]; then
                isNotice "Folder $folder_name no longer exists. Removing from the Database."

                # Delete the entry from the apps table
                local result; result=$(runInstallOp sqlite3 "$docker_dir/$db_file" "DELETE FROM apps WHERE name = '$app_name';")
                checkSuccess "Removing $app_name from the apps database."

                portsRemoveFromDatabase $app_name;

                ((updated_count++)) # Increment updated_count
            fi
        fi
    done

    # Check if all apps are up to date
    if [ "$updated_count" -eq 0 ]; then
        checkSuccess "All apps are up to date."
    fi

    # Reap leftover app folders that hold no real data: completely empty, or
    # holding only the regenerable .config and/or the migrate.txt marker. There
    # is nothing to lose in any of these cases, so we clean them automatically
    # rather than prompting — the old "WIPE ALL DATA" question fired precisely
    # when there was no data to wipe.
    for folder_name in $folder_names; do
        [[ "$folder_name" == "libreportal" ]] && continue
        local folder_path="$containers_dir/$folder_name"

        if [ ! -d "$folder_path" ]; then
            isNotice "Folder $folder_name no longer exists — removing it from the database."
            runInstallOp sqlite3 "$docker_dir/$db_file" "DELETE FROM apps WHERE name = '$folder_name';"
            checkSuccess "Removing $folder_name from the apps database."
            ((updated_count++))
            continue
        fi

        local num_files=$(runFileOp find "$folder_path" -maxdepth 1 -type f | wc -l)
        local has_config=false has_migrate=false
        [ -f "$folder_path/$folder_name.config" ] && has_config=true
        [ -f "$folder_path/migrate.txt" ] && has_migrate=true

        # Describe why the folder counts as a no-data leftover (empty string =
        # it has real content, so leave it alone).
        local reason=""
        if [ "$num_files" -eq 0 ]; then
            reason="empty"
        elif [ "$num_files" -eq 1 ] && $has_config; then
            reason="only a config file"
        elif [ "$num_files" -eq 1 ] && $has_migrate; then
            reason="only a migrate.txt marker"
        elif [ "$num_files" -eq 2 ] && $has_config && $has_migrate; then
            reason="only a config file and a migrate.txt marker"
        fi

        if [[ -n "$reason" ]]; then
            isNotice "Cleaning up $folder_name ($reason — no data to lose)."
            dockerUninstallApp "$folder_name"
        fi
    done
}