#!/bin/bash

# Walks installed apps and offers to flip CFG_<APP>_NETWORK to gluetun for each
# eligible one. Honors the curated category list + CFG_REQUIREMENT_GLUETUN_FOR_ALL
# override flag. Skips itself, Traefik, LibrePortal, fail2ban.
gluetunRouteExistingAppsPrompt()
{
    local categories_file="${containers_dir}libreportal/frontend/data/apps/gluetun-eligible-categories.json"
    local override="${CFG_REQUIREMENT_GLUETUN_FOR_ALL:-false}"

    if ! command -v sqlite3 >/dev/null 2>&1 || [[ ! -f "$docker_dir/$db_file" ]]; then
        isNotice "Database not available; skipping per-app routing prompt."
        return 0
    fi

    local allow_csv=""
    if [[ -f "$categories_file" ]] && command -v jq >/dev/null 2>&1; then
        allow_csv=$(jq -r '.categories | join(",")' "$categories_file" 2>/dev/null | tr '[:upper:]' '[:lower:]')
    fi

    local installed
    installed=$(runInstallOp sqlite3 "$docker_dir/$db_file" \
        "SELECT name FROM apps WHERE status = 1 AND name NOT IN ('gluetun','libreportal','traefik','fail2ban') ORDER BY name;" 2>/dev/null)

    if [[ -z "$installed" ]]; then
        isNotice "No other apps installed yet. Skipping."
        return 0
    fi

    local eligible=()
    while IFS= read -r app; do
        [[ -z "$app" ]] && continue
        local cfg_file="${containers_dir}${app}/${app}.config"
        [[ -f "$cfg_file" ]] || continue
        local category
        category=$(grep -E "^CFG_${app^^}_CATEGORY=" "$cfg_file" 2>/dev/null \
            | head -1 | cut -d'=' -f2 | tr -d '"' | tr '[:upper:]' '[:lower:]')
        local is_eligible="false"
        if [[ "$override" == "true" ]]; then
            is_eligible="true"
        elif [[ -n "$allow_csv" ]]; then
            IFS=',' read -ra cats <<< "$allow_csv"
            for c in "${cats[@]}"; do
                if [[ "$c" == "$category" ]]; then is_eligible="true"; break; fi
            done
        fi
        [[ "$is_eligible" == "true" ]] && eligible+=("$app")
    done <<< "$installed"

    if [[ ${#eligible[@]} -eq 0 ]]; then
        isNotice "No eligible installed apps. (Enable CFG_REQUIREMENT_GLUETUN_FOR_ALL to expose every app.)"
        return 0
    fi

    echo "    The following installed apps can be routed through Gluetun:"
    for app in "${eligible[@]}"; do
        local cfg_file="${containers_dir}${app}/${app}.config"
        local current
        current=$(grep -E "^CFG_${app^^}_NETWORK=" "$cfg_file" 2>/dev/null | head -1 | cut -d'=' -f2)
        [[ -z "$current" ]] && current="default"
        echo "      - ${app} (current: ${current})"
    done
    echo ""
    isQuestion "Apply gluetun routing now? Tick each app to flip. (y/N): "
    local resp
    read -rp "" resp
    echo ""
    case "$resp" in
        [yY]*) ;;
        *) isNotice "Skipped. You can apply later via the WebUI gluetun page or per-app config."; return 0 ;;
    esac

    for app in "${eligible[@]}"; do
        local cfg_file="${containers_dir}${app}/${app}.config"
        local current
        current=$(grep -E "^CFG_${app^^}_NETWORK=" "$cfg_file" 2>/dev/null | head -1 | cut -d'=' -f2)
        [[ -z "$current" ]] && current="default"
        isQuestion "  Route '$app' through gluetun? (current: $current) [y/n/skip]: "
        local r
        read -rp "" r
        case "$r" in
            [yY]*)
                updateConfigOption "CFG_${app^^}_NETWORK" "gluetun" "$cfg_file"
                isSuccessful "  Set CFG_${app^^}_NETWORK=gluetun. Re-running install for $app..."
                dockerInstallApp "$app"
                ;;
            [nN]*)
                if [[ "$current" == "gluetun" ]]; then
                    updateConfigOption "CFG_${app^^}_NETWORK" "default" "$cfg_file"
                    isSuccessful "  Reverted $app to default network. Re-running install..."
                    dockerInstallApp "$app"
                fi
                ;;
            *) ;;
        esac
    done
}