#!/usr/bin/env bash
set -euo pipefail

# =============================================================================
# ideskpet - CLI tool for I-DeskPet Quickshell application
# =============================================================================

VERSION="1.0.0"
REPO_URL="https://github.com/InoriShio/I-DeskPet"
INSTALL_DIR="/etc/xdg/quickshell/I-DeskPet"
LOG_DIR="$HOME/.local/state/ideskpet"
LOG_FILE="$LOG_DIR/ideskpet.log"
APP_ID="I-DeskPet"

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
BOLD='\033[1m'
NC='\033[0m'

# =============================================================================
# Helper Functions
# =============================================================================

print_help() {
    cat << EOF
${BOLD}ideskpet${NC} - CLI tool for I-DeskPet desktop pet application (v${VERSION})

${BOLD}USAGE:${NC}
    ideskpet <COMMAND> [OPTIONS]

${BOLD}COMMANDS:${NC}
    ${GREEN}start${NC}              Start the I-DeskPet application
    ${GREEN}stop${NC}               Stop the running I-DeskPet instance
    ${GREEN}restart${NC}            Restart the I-DeskPet application
    ${GREEN}log${NC}                Show application logs
    ${GREEN}update${NC}             Update I-DeskPet from GitHub

${BOLD}HYPRLAND SHORTCUTS:${NC}
    ${BLUE}toggle-layer${NC}       Toggle pet between overlay/bottom layer
    ${BLUE}toggle-region${NC}      Toggle click-through mode
    ${BLUE}cycle-zindex${NC}       Cycle z-index of hovered gif

${BOLD}LOG OPTIONS:${NC}
    ideskpet log           Show last 50 lines of logs
    ideskpet log -f        Follow logs in real-time (Ctrl+C to exit)
    ideskpet log -n <N>    Show last N lines of logs

${BOLD}OTHER:${NC}
    -h, --help         Show this help message
    -v, --version      Show version

${BOLD}CONFIGURATION:${NC}
    User config: ~/.config/I-DeskPet/config.json

    Example config.json:
    {
      "gifFolder": "/home/user/Pictures/Pets",
      "maxScaling": 1
    }

${BOLD}HYPRLAND KEYBIND EXAMPLES:${NC}
    bind = CTRL, mouse:274, global, I-DeskPet:toggle-Region
    bind = SHIFT, mouse:274, global, I-DeskPet:toggle-Layer
    bind = \$mainMod, Z, global, I-DeskPet:cycle-zIndex

${BOLD}INSTALLATION:${NC}
    sudo cp ideskpet /usr/bin/ideskpet
    sudo chmod +x /usr/bin/ideskpet

EOF
}

print_version() {
    echo "ideskpet v${VERSION}"
}

info() {
    echo -e "${GREEN}[INFO]${NC} $1"
}

warn() {
    echo -e "${YELLOW}[WARN]${NC} $1"
}

error() {
    echo -e "${RED}[ERROR]${NC} $1" >&2
}

is_running() {
    pgrep -f "quickshell.*${APP_ID}" > /dev/null 2>&1
}

get_pid() {
    pgrep -f "quickshell.*${APP_ID}" 2>/dev/null || true
}

ensure_log_dir() {
    if [[ ! -d "$LOG_DIR" ]]; then
        mkdir -p "$LOG_DIR"
    fi
}

ensure_installed() {
    if [[ ! -d "$INSTALL_DIR" ]]; then
        warn "I-DeskPet is not installed at ${INSTALL_DIR}"
        info "Cloning from ${REPO_URL}..."
        
        # Check if /etc/xdg/quickshell exists
        if [[ ! -d "/etc/xdg/quickshell" ]]; then
            info "Creating /etc/xdg/quickshell directory (requires sudo)..."
            sudo mkdir -p /etc/xdg/quickshell
        fi
        
        info "Cloning repository (requires sudo)..."
        sudo git clone "$REPO_URL" "$INSTALL_DIR"
        
        if [[ $? -eq 0 ]]; then
            info "Successfully installed I-DeskPet to ${INSTALL_DIR}"
        else
            error "Failed to clone repository"
            exit 1
        fi
    fi
}

check_dependencies() {
    local missing=()
    
    if ! command -v quickshell &> /dev/null; then
        missing+=("quickshell")
    fi
    
    if ! command -v hyprctl &> /dev/null; then
        missing+=("hyprctl (hyprland)")
    fi
    
    if ! command -v git &> /dev/null; then
        missing+=("git")
    fi
    
    if [[ ${#missing[@]} -gt 0 ]]; then
        error "Missing dependencies: ${missing[*]}"
        echo "Please install the missing packages and try again."
        exit 1
    fi
}

# =============================================================================
# Command Implementations
# =============================================================================

cmd_start() {
    check_dependencies
    ensure_installed
    ensure_log_dir
    
    if is_running; then
        warn "I-DeskPet is already running (PID: $(get_pid))"
        echo "Use 'ideskpet restart' to restart, or 'ideskpet stop' to stop."
        exit 1
    fi
    
    info "Starting I-DeskPet..."
    
    # Start quickshell in background, redirect output to log file
    nohup quickshell -p "$INSTALL_DIR" >> "$LOG_FILE" 2>&1 &
    disown
    
    # Wait a moment and check if it started successfully
    sleep 1
    
    if is_running; then
        info "I-DeskPet started successfully (PID: $(get_pid))"
        echo "Use 'ideskpet log -f' to view logs"
    else
        error "Failed to start I-DeskPet"
        echo "Check logs with 'ideskpet log' for details"
        exit 1
    fi
}

cmd_stop() {
    if ! is_running; then
        warn "I-DeskPet is not running"
        exit 0
    fi
    
    local pid
    pid=$(get_pid)
    
    info "Stopping I-DeskPet (PID: ${pid})..."
    
    # Try graceful shutdown first
    kill "$pid" 2>/dev/null || true
    
    # Wait up to 5 seconds for graceful shutdown
    local count=0
    while is_running && [[ $count -lt 10 ]]; do
        sleep 0.5
        ((count++))
    done
    
    # Force kill if still running
    if is_running; then
        warn "Graceful shutdown failed, force killing..."
        kill -9 "$pid" 2>/dev/null || true
        sleep 0.5
    fi
    
    if is_running; then
        error "Failed to stop I-DeskPet"
        exit 1
    else
        info "I-DeskPet stopped successfully"
    fi
}

cmd_restart() {
    info "Restarting I-DeskPet..."
    
    if is_running; then
        cmd_stop
    fi
    
    sleep 0.5
    cmd_start
}

cmd_log() {
    ensure_log_dir
    
    if [[ ! -f "$LOG_FILE" ]]; then
        warn "No log file found at ${LOG_FILE}"
        echo "Start I-DeskPet first with 'ideskpet start'"
        exit 1
    fi
    
    local follow=false
    local lines=50
    
    # Parse arguments
    while [[ $# -gt 0 ]]; do
        case "$1" in
            -f|--follow)
                follow=true
                shift
                ;;
            -n|--lines)
                if [[ -n "${2:-}" ]] && [[ "$2" =~ ^[0-9]+$ ]]; then
                    lines="$2"
                    shift 2
                else
                    error "Option -n requires a numeric argument"
                    exit 1
                fi
                ;;
            *)
                error "Unknown log option: $1"
                echo "Usage: ideskpet log [-f] [-n <lines>]"
                exit 1
                ;;
        esac
    done
    
    if [[ "$follow" == true ]]; then
        info "Following logs (Ctrl+C to exit)..."
        echo "---"
        tail -n "$lines" -f "$LOG_FILE"
    else
        tail -n "$lines" "$LOG_FILE"
    fi
}

cmd_update() {
    check_dependencies
    
    if [[ ! -d "$INSTALL_DIR" ]]; then
        error "I-DeskPet is not installed at ${INSTALL_DIR}"
        echo "Run 'ideskpet start' to install it first."
        exit 1
    fi
    
    info "Updating I-DeskPet from GitHub..."
    
    cd "$INSTALL_DIR"
    
    # Check for local changes
    if ! sudo git diff --quiet 2>/dev/null; then
        warn "Local changes detected. They may be overwritten."
    fi
    
    sudo git pull
    
    if [[ $? -eq 0 ]]; then
        info "Update completed successfully"
        
        if is_running; then
            echo ""
            warn "I-DeskPet is currently running."
            echo "Run 'ideskpet restart' to apply changes."
        fi
    else
        error "Update failed"
        exit 1
    fi
}

cmd_shortcut() {
    local shortcut="$1"
    
    if ! command -v hyprctl &> /dev/null; then
        error "hyprctl not found. Are you running Hyprland?"
        exit 1
    fi
    
    if ! is_running; then
        warn "I-DeskPet is not running"
        echo "Start it first with 'ideskpet start'"
        exit 1
    fi
    
    info "Triggering shortcut: ${APP_ID}:${shortcut}"
    hyprctl dispatch global "${APP_ID}:${shortcut}"
}

# =============================================================================
# Main Entry Point
# =============================================================================

main() {
    local cmd="${1:-}"
    
    case "$cmd" in
        start)
            cmd_start
            ;;
        stop)
            cmd_stop
            ;;
        restart)
            cmd_restart
            ;;
        log)
            shift
            cmd_log "$@"
            ;;
        update)
            cmd_update
            ;;
        toggle-layer)
            cmd_shortcut "toggle-Layer"
            ;;
        toggle-region)
            cmd_shortcut "toggle-Region"
            ;;
        cycle-zindex)
            cmd_shortcut "cycle-zIndex"
            ;;
        -h|--help|help)
            print_help
            ;;
        -v|--version|version)
            print_version
            ;;
        "")
            print_help
            ;;
        *)
            error "Unknown command: ${cmd}"
            echo "Run 'ideskpet --help' for usage information."
            exit 1
            ;;
    esac
}

main "$@"