#!/bin/bash
# nas-update — NAS update manager (interactive root script)
# Orchestrates nas-system-update, nas-system-upgrade, nas-docker-pull, nas-docker-up, nas-docker-prune
# Usage: nas-update

set -euo pipefail

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
BOLD='\033[1m'
RESET='\033[0m'

echo -e "${BOLD}=====================================================${RESET}"
echo -e "${BOLD}              NAS — Update Manager                   ${RESET}"
echo -e "${BOLD}=====================================================${RESET}"
echo ""

# ─────────────────────────────────────────────────────
# Phase 1: System analysis
# ─────────────────────────────────────────────────────
echo -e "${BOLD}--- Phase 1: System analysis (apt) ---${RESET}"
nas-system-update
echo ""

# ─────────────────────────────────────────────────────
# Phase 2: Docker analysis (pull + diff detection)
# ─────────────────────────────────────────────────────
echo -e "${BOLD}--- Phase 2: Docker analysis ---${RESET}"

nas-docker-pull

# Read JSON written by nas-docker-pull
docker_json=$(cat /tmp/nas-docker-pull.json 2>/dev/null || echo '{"count":0,"containers":[]}')

containers_to_update=()
compose_dirs=()
old_versions=()
new_versions=()

while IFS= read -r line; do
    name=$(echo "$line" | grep -o '"name":"[^"]*"' | cut -d'"' -f4)
    compose_dir=$(echo "$line" | grep -o '"compose_dir":"[^"]*"' | cut -d'"' -f4)
    current=$(echo "$line" | grep -o '"current":"[^"]*"' | cut -d'"' -f4)
    available=$(echo "$line" | grep -o '"available":"[^"]*"' | cut -d'"' -f4)
    [ -z "$name" ] && continue
    containers_to_update+=("$name")
    compose_dirs+=("$compose_dir")
    old_versions+=("$current")
    new_versions+=("$available")
done < <(echo "$docker_json" | grep -o '{[^}]*}')

echo ""

# ─────────────────────────────────────────────────────
# Phase 3: System upgrade
# ─────────────────────────────────────────────────────
echo -e "${BOLD}--- Phase 3: System upgrade ---${RESET}"

while true; do
    read -p "Apply apt full-upgrade? [y/n]: " sys_choice
    case "$sys_choice" in
        [yY]*)
            nas-system-upgrade
            break
            ;;
        [nN]*)
            echo -e "${YELLOW}⏭  System upgrade skipped.${RESET}"
            break
            ;;
        *) echo "Please answer y or n." ;;
    esac
done

echo ""

# ─────────────────────────────────────────────────────
# Phase 4: Docker upgrade
# ─────────────────────────────────────────────────────
echo -e "${BOLD}--- Phase 4: Docker upgrade ---${RESET}"

if [ ${#containers_to_update[@]} -eq 0 ]; then
    echo -e "${GREEN}✅ No containers to update.${RESET}"
    echo ""
    echo -e "${BOLD}=====================================================${RESET}"
    echo -e "${GREEN}                     Done!                          ${RESET}"
    echo -e "${BOLD}=====================================================${RESET}"
    exit 0
fi

echo ""
echo -e "${BOLD}Containers available for update:${RESET}"
for i in "${!containers_to_update[@]}"; do
    echo -e "  • ${CYAN}${containers_to_update[$i]}${RESET}: ${YELLOW}${old_versions[$i]}${RESET} → ${GREEN}${new_versions[$i]}${RESET}"
done
echo ""

UPDATE_ALL=false
while true; do
    read -p "Update ALL containers? [y]es (All) / [n]o (Choose per container) / [s]kip (Skip all): " docker_choice
    case "$docker_choice" in
        [yY]*) UPDATE_ALL=true; break ;;
        [nN]*) UPDATE_ALL=false; break ;;
        [sS]*) echo -e "${YELLOW}⏭  Docker upgrade skipped.${RESET}"; break ;;
        *) echo "Please answer y, n or s." ;;
    esac
done

if [[ "$docker_choice" =~ ^[sS] ]]; then
    echo ""
    echo -e "${BOLD}=====================================================${RESET}"
    echo -e "${GREEN}                     Done!                          ${RESET}"
    echo -e "${BOLD}=====================================================${RESET}"
    exit 0
fi

# Detect global OMV env file
OMV_GLOBAL_ENV=""
if [ -f "/etc/omv-compose.env" ]; then
    OMV_GLOBAL_ENV="/etc/omv-compose.env"
elif [ -f "/srv/omv-compose.env" ]; then
    OMV_GLOBAL_ENV="/srv/omv-compose.env"
fi

START_DIR=$(pwd)
upgraded=0
failed=0

for i in "${!containers_to_update[@]}"; do
    c_name="${containers_to_update[$i]}"
    c_dir="${compose_dirs[$i]}"
    c_old_ver="${old_versions[$i]}"
    c_new_ver="${new_versions[$i]}"

    DO_UPDATE=false

    if [ "$UPDATE_ALL" = true ]; then
        DO_UPDATE=true
    else
        while true; do
            read -p "  Update '${c_name}' (${c_old_ver} → ${c_new_ver})? [y/n]: " choice
            case "$choice" in
                [yY]*) DO_UPDATE=true; break ;;
                [nN]*) DO_UPDATE=false; break ;;
                *) echo "Please answer y or n." ;;
            esac
        done
    fi

    if [ "$DO_UPDATE" = true ]; then
        echo -e "  🚀 Updating ${CYAN}${c_name}${RESET}..."

        if cd "$c_dir" 2>/dev/null; then
            ENV_ARGS=""

            if [ -n "$OMV_GLOBAL_ENV" ] && [ -f "$OMV_GLOBAL_ENV" ]; then
                ENV_ARGS="--env-file $OMV_GLOBAL_ENV"
            else
                PARENT_DIR=$(dirname "$c_dir")
                if [ -f "$PARENT_DIR/global.env" ]; then
                    ENV_ARGS="--env-file $PARENT_DIR/global.env"
                elif [ -f "$PARENT_DIR/.env" ]; then
                    ENV_ARGS="--env-file $PARENT_DIR/.env"
                fi
            fi

            if [ -f ".env" ]; then
                ENV_ARGS="$ENV_ARGS --env-file .env"
            fi

            if docker compose $ENV_ARGS up -d --remove-orphans 2>&1; then
                echo -e "  ${GREEN}✅ ${c_name} updated successfully.${RESET}"
                upgraded=$((upgraded + 1))
            else
                echo -e "  ${RED}❌ Update failed for ${c_name}.${RESET}"
                failed=$((failed + 1))
            fi
        else
            echo -e "  ${RED}❌ Cannot access ${c_dir}.${RESET}"
            failed=$((failed + 1))
        fi
    else
        echo -e "  ⏭  Skipped: ${c_name}"
    fi

    cd "$START_DIR"
done

# ─────────────────────────────────────────────────────
# Phase 5: Cleanup
# ─────────────────────────────────────────────────────
echo ""
echo -e "${BOLD}--- Phase 5: Cleanup ---${RESET}"
nas-docker-prune

echo ""
echo -e "${BOLD}=====================================================${RESET}"
echo -e "${BOLD}                     Done!                           ${RESET}"
echo -e "  Docker: ${GREEN}✅ ${upgraded} updated${RESET}  ${RED}❌ ${failed} failed${RESET}"
echo -e "${BOLD}=====================================================${RESET}"