#!/usr/bin/env bash
# Gemini CLI — Uninstaller
# Removes Gemini CLI, settings, env vars, and npm registry config.
#
# Usage: sudo bash ugemini_uninstall.sh
set -euo pipefail

# ---- Interactive mode select (post user-data-loss incident) ----
# Modes:
#   safe (default)  — remove binary + settings, KEEP user data
#   settings-only   — clear settings only, keep binary + user data
#   full            — wipe everything (with tar backup first)

MODE="${UGEMINI_MODE:-}"
ASSUME_YES="${UCLAUDE_YES:-0}"
TIMESTAMP=$(date +%Y%m%d%H%M%S)

inventory_user_dirs_gemini() {
    for user_home in /root /home/*; do
        local d="$user_home/.gemini"
        [ -d "$d" ] || continue
        local size_kb
        size_kb=$(du -sk "$d" 2>/dev/null | awk '{print $1}')
        echo "    $d  ($((size_kb / 1024)) MB)"
    done
}

if [ -z "$MODE" ] && [ "$ASSUME_YES" != "1" ]; then
    echo
    echo "What to uninstall Gemini CLI?"
    echo "  1) safe          — remove binary + settings, KEEP user data (recommended)"
    echo "  2) settings-only — only clear settings, keep binary + user data"
    echo "  3) full          — wipe everything (tar backup created first)"
    echo "  4) cancel"
    echo
    echo "Your data right now:"
    inventory_user_dirs_gemini
    echo
    while true; do
        read -r -p "Choose [1/2/3/4] (default 1=safe): " choice
        case "${choice:-1}" in
            1|safe)            MODE="safe";          break ;;
            2|settings-only)   MODE="settings-only"; break ;;
            3|full)
                echo "WARNING: full mode DESTROYS all Gemini CLI user data."
                read -r -p "Type 'WIPE' to confirm: " confirm
                [ "$confirm" = "WIPE" ] && MODE="full" && break
                echo "Confirmation failed, pick again." ;;
            4|cancel|q|exit)   echo "Cancelled."; exit 0 ;;
            *) echo "Invalid — pick 1/2/3/4." ;;
        esac
    done
elif [ -z "$MODE" ]; then
    MODE="safe"
fi

echo "Mode: $MODE"

GREEN="\033[92m"
RED="\033[91m"
CYAN="\033[96m"
YELLOW="\033[93m"
BOLD="\033[1m"
RESET="\033[0m"

log()  { echo -e "${GREEN}[+]${RESET} $*"; }
warn() { echo -e "${YELLOW}[~]${RESET} $*"; }
info() { echo -e "${CYAN}[i]${RESET} $*"; }

OS="$(uname -s)"
IS_MACOS=false
[ "$OS" = "Darwin" ] && IS_MACOS=true

sedi() {
    if $IS_MACOS; then
        sed -i '' "$@"
    else
        sed -i "$@"
    fi
}

if $IS_MACOS; then
    SCAN_DIRS="/Users"
else
    SCAN_DIRS="/home"
fi

echo -e "${BOLD}"
echo "  +--------------------------------------+"
echo "  |    Gemini CLI — Uninstaller          |"
echo "  +--------------------------------------+"
echo -e "${RESET}"

# ---- Uninstall npm package ----

if command -v gemini &>/dev/null || npm list -g @google/gemini-cli &>/dev/null 2>&1; then
    info "Removing @google/gemini-cli..."
    npm uninstall -g @google/gemini-cli 2>/dev/null || true
    log "npm package removed"
else
    warn "Gemini CLI not found in npm global packages"
fi

# ---- Remove settings ----

for user_home in /root $SCAN_DIRS/*; do
    GEMINI_DIR="$user_home/.gemini"
    if [ -d "$GEMINI_DIR" ]; then
        # ALWAYS create full tar backup BEFORE any destructive op, in EVERY mode.
        # Per user demand after data loss incident: never trust mode flags alone.
        FULL_BAK="$user_home/.gemini.uninstall-backup.$TIMESTAMP.tar.gz"
        echo "  Creating safety backup: $FULL_BAK ..."
        if ! tar -czf "$FULL_BAK" -C "$user_home" .gemini 2>/dev/null; then
            echo "  ERROR: backup FAILED for $GEMINI_DIR — REFUSING to proceed (data preserved)"
            continue
        fi
        echo "  Safety backup: $FULL_BAK ($(du -h "$FULL_BAK" 2>/dev/null | awk '{print $1}'))"
        echo "  Restore anytime: tar -xzf $FULL_BAK -C $user_home"

        # PRESERVE user data by default. See uclaude_uninstall.sh history.
        case "${MODE:-safe}" in
            safe)
                # Remove only managed config files, keep everything else
                for f in settings.json config.toml config.yaml; do
                    if [ -f "$user_home/.gemini/$f" ]; then
                        cp -p "$user_home/.gemini/$f" "$user_home/.gemini/$f.uninstall.bak.$TIMESTAMP"
                        rm -f "$user_home/.gemini/$f"
                        echo "  Removed $user_home/.gemini/$f (backup: $f.uninstall.bak.$TIMESTAMP)"
                    fi
                done
                echo "  PRESERVED user data in $user_home/.gemini"
                ;;
            settings-only)
                for f in settings.json config.toml config.yaml; do
                    if [ -f "$user_home/.gemini/$f" ]; then
                        cp -p "$user_home/.gemini/$f" "$user_home/.gemini/$f.uninstall.bak.$TIMESTAMP"
                        rm -f "$user_home/.gemini/$f"
                    fi
                done
                ;;
            full)
                rm -rf "$user_home/.gemini"
                echo "  Removed $user_home/.gemini (full wipe)"
                ;;
        esac
    fi
done

# ---- Remove env vars from shell rc files ----

for user_home in /root $SCAN_DIRS/*; do
    for rc_file in "$user_home/.bashrc" "$user_home/.zshrc"; do
        if [ -f "$rc_file" ] && grep -q 'GEMINI_API_KEY\|GOOGLE_GEMINI_BASE_URL\|Gemini CLI\|gemini-cli-env' "$rc_file" 2>/dev/null; then
            info "Cleaning env vars from $rc_file..."
            sedi '/# Gemini CLI/d' "$rc_file"
            sedi '/gemini-cli-env\.sh/d' "$rc_file"
            sedi '/GEMINI_API_KEY/d' "$rc_file"
            sedi '/GOOGLE_GEMINI_BASE_URL/d' "$rc_file"
            log "Cleaned $rc_file"
        fi
    done
done

# ---- Remove env files ----

for env_file in "/etc/profile.d/gemini-cli.sh" "/etc/gemini-cli-env.sh"; do
    if [ -f "$env_file" ]; then
        info "Removing $env_file..."
        rm -f "$env_file"
        log "Removed $env_file"
    fi
done

# ---- Remove launchctl env vars (macOS) ----

if $IS_MACOS; then
    launchctl unsetenv GEMINI_API_KEY 2>/dev/null || true
    launchctl unsetenv GOOGLE_GEMINI_BASE_URL 2>/dev/null || true
    log "launchctl env vars cleared"
fi

# ---- Remove env vars from /etc/environment (Linux) ----

if [ -f "/etc/environment" ] && grep -q 'GEMINI_API_KEY\|GOOGLE_GEMINI_BASE_URL' /etc/environment 2>/dev/null; then
    info "Cleaning /etc/environment..."
    sedi '/GEMINI_API_KEY/d' /etc/environment
    sedi '/GOOGLE_GEMINI_BASE_URL/d' /etc/environment
    log "Cleaned /etc/environment"
fi

# ---- Remove npm registry config ----

info "Removing npm registry config..."
npm config delete @google:registry 2>/dev/null || true
log "npm registry config removed"

echo ""
echo -e "${GREEN}${BOLD}  Gemini CLI fully uninstalled!${RESET}"
echo ""