#!/bin/bash

# BBeOS Terminal Emulation Script
# Simulates BBeOS interface in Linux terminal

set -e

# Configuration
BBEOS_VERSION="1.0.0"
TERMINAL_WIDTH=80
TERMINAL_HEIGHT=24

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
PURPLE='\033[0;35m'
CYAN='\033[0;36m'
WHITE='\033[1;37m'
NC='\033[0m' # No Color

# BBeOS state
CURRENT_SCREEN="home"
SELECTED_APP=0
APP_COUNT=16

# App definitions
declare -a APP_NAMES=(
    "📞 Phone" "💬 SMS" "📝 Editor" "⚙️ Settings"
    "🧮 Calc" "📁 Files" "🌐 Web" "📊 Info"
    "📶 WiFi" "🔋 Power" "📱 Phone" "🎵 Music"
    "🗺️ GPS" "📧 Email" "📅 Cal" "❓ Help"
)

declare -a APP_COMMANDS=(
    "phone" "sms" "editor" "settings"
    "calculator" "files" "web" "info"
    "wifi" "power" "phone" "music"
    "gps" "email" "calendar" "help"
)

# Logging functions
log_info() {
    echo -e "${BLUE}[INFO]${NC} $1"
}

log_success() {
    echo -e "${GREEN}[SUCCESS]${NC} $1"
}

log_warning() {
    echo -e "${YELLOW}[WARNING]${NC} $1"
}

log_error() {
    echo -e "${RED}[ERROR]${NC} $1"
}

# Clear screen
clear_screen() {
    clear
}

# Draw border
draw_border() {
    local width=$1
    local title=$2
    
    echo -n "╔"
    for ((i=0; i<width-2; i++)); do
        echo -n "═"
    done
    echo "╗"
    
    if [ -n "$title" ]; then
        local title_len=${#title}
        local padding=$(( (width - title_len - 2) / 2 ))
        echo -n "║"
        for ((i=0; i<padding; i++)); do
            echo -n " "
        done
        echo -n "$title"
        for ((i=0; i<width-title_len-padding-2; i++)); do
            echo -n " "
        done
        echo "║"
    fi
}

# Draw bottom border
draw_bottom_border() {
    local width=$1
    echo -n "╚"
    for ((i=0; i<width-2; i++)); do
        echo -n "═"
    done
    echo "╝"
}

# Draw home screen
draw_home_screen() {
    clear_screen
    
    # Header
    draw_border $TERMINAL_WIDTH "BBeOS v$BBEOS_VERSION - BlackBerry Classic Q20"
    
    # Status bar
    local time=$(date +"%H:%M")
    local status="Ready"
    echo -e "║ Status: $status$(printf '%*s' $((TERMINAL_WIDTH - 12 - ${#status} - ${#time}))) $time ║"
    
    # App grid (4x4)
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    for ((row=0; row<4; row++)); do
        local line="║"
        for ((col=0; col<4; col++)); do
            local index=$((row * 4 + col))
            local app_name="${APP_NAMES[$index]}"
            
            if [ $index -eq $SELECTED_APP ]; then
                line+=" [${CYAN}$app_name${NC}]"
            else
                line+="  $app_name "
            fi
            
            if [ $col -lt 3 ]; then
                line+="  "
            fi
        done
        
        # Pad to full width
        local line_len=${#line}
        line+=$(printf '%*s' $((TERMINAL_WIDTH - line_len - 1)))
        line+="║"
        echo -e "$line"
    done
    
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    # Help bar
    echo -e "║ ${YELLOW}[↑↓]${NC} Navigate  ${YELLOW}[Enter]${NC} Open  ${YELLOW}[Esc]${NC} Back  ${YELLOW}[Q]${NC} Quit$(printf '%*s' $((TERMINAL_WIDTH - 45))) ║"
    
    # Footer
    draw_bottom_border $TERMINAL_WIDTH
}

# Draw calculator screen
draw_calculator() {
    clear_screen
    
    draw_border $TERMINAL_WIDTH "BBeOS Calculator"
    
    # Display
    echo -e "║ Display: 0.00$(printf '%*s' $((TERMINAL_WIDTH - 12))) ║"
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    # Calculator buttons
    local buttons=(
        "  7  " "  8  " "  9  " "  /  " "  %  " "  ^  "
        "  4  " "  5  " "  6  " "  *  " " M+ " " M- "
        "  1  " "  2  " "  3  " "  -  " " MR " " MC "
        "  0  " "  .  " "  =  " "  +  " " MS " " AC "
    )
    
    for ((row=0; row<4; row++)); do
        local line="║"
        for ((col=0; col<6; col++)); do
            local index=$((row * 6 + col))
            local button="${buttons[$index]}"
            line+=" [$button]"
        done
        
        # Pad to full width
        local line_len=${#line}
        line+=$(printf '%*s' $((TERMINAL_WIDTH - line_len - 1)))
        line+="║"
        echo "$line"
    done
    
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    # Help bar
    echo -e "║ ${YELLOW}[0-9]${NC} Numbers  ${YELLOW}[+/-/*//]${NC} Operations  ${YELLOW}[Esc]${NC} Back$(printf '%*s' $((TERMINAL_WIDTH - 50))) ║"
    
    draw_bottom_border $TERMINAL_WIDTH
}

# Draw text editor screen
draw_editor() {
    clear_screen
    
    draw_border $TERMINAL_WIDTH "BBeOS Text Editor - document.txt"
    
    # File content
    local lines=(
        "1 │ Hello World!"
        "2 │ This is a test document."
        "3 │"
        "4 │ Welcome to BBeOS!"
        "5 │"
        "6 │ Features:"
        "7 │ - Physical keyboard"
        "8 │ - Trackpad navigation"
        "9 │ - Square display"
        "10│"
        "11│"
        "12│"
        "13│"
        "14│"
        "15│"
    )
    
    for line in "${lines[@]}"; do
        echo -e "║ $line$(printf '%*s' $((TERMINAL_WIDTH - ${#line} - 3))) ║"
    done
    
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    # Status bar
    echo -e "║ Cursor: 1,1  Lines: 15  [MODIFIED]$(printf '%*s' $((TERMINAL_WIDTH - 35))) ║"
    
    draw_bottom_border $TERMINAL_WIDTH
}

# Draw settings screen
draw_settings() {
    clear_screen
    
    draw_border $TERMINAL_WIDTH "BBeOS Settings"
    
    local settings=(
        "Display Settings"
        "  - Brightness: 75%"
        "  - Timeout: 30 seconds"
        "  - Theme: Dark"
        ""
        "Network Settings"
        "  - Wi-Fi: Enabled"
        "  - Bluetooth: Enabled"
        "  - Mobile Data: Enabled"
        ""
        "System Settings"
        "  - Language: English"
        "  - Time Zone: UTC"
        "  - Auto Update: Enabled"
    )
    
    for setting in "${settings[@]}"; do
        echo -e "║ $setting$(printf '%*s' $((TERMINAL_WIDTH - ${#setting} - 3))) ║"
    done
    
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    # Help bar
    echo -e "║ ${YELLOW}[↑↓]${NC} Navigate  ${YELLOW}[Enter]${NC} Edit  ${YELLOW}[Esc]${NC} Back$(printf '%*s' $((TERMINAL_WIDTH - 40))) ║"
    
    draw_bottom_border $TERMINAL_WIDTH
}

# Draw system info screen
draw_system_info() {
    clear_screen
    
    draw_border $TERMINAL_WIDTH "BBeOS System Information"
    
    local info=(
        "Hardware Information"
        "  - SoC: Qualcomm MSM8960 (Snapdragon S4 Plus)"
        "  - CPU: ARMv7 Krait (1.5 GHz dual-core)"
        "  - GPU: Adreno 225"
        "  - RAM: 2 GB LPDDR2"
        "  - Storage: 16 GB eMMC"
        ""
        "Display Information"
        "  - Resolution: 720x720"
        "  - Type: IPS LCD"
        "  - Size: 3.5 inches"
        ""
        "Software Information"
        "  - OS: BBeOS v$BBEOS_VERSION"
        "  - Kernel: Linux 6.8"
        "  - Display Server: Wayland"
        "  - UI Framework: Custom"
    )
    
    for line in "${info[@]}"; do
        echo -e "║ $line$(printf '%*s' $((TERMINAL_WIDTH - ${#line} - 3))) ║"
    done
    
    echo "║$(printf '%*s' $((TERMINAL_WIDTH-2)))║"
    
    # Help bar
    echo -e "║ ${YELLOW}[Esc]${NC} Back$(printf '%*s' $((TERMINAL_WIDTH - 10))) ║"
    
    draw_bottom_border $TERMINAL_WIDTH
}

# Handle keyboard input
handle_input() {
    local key=$1
    
    case $CURRENT_SCREEN in
        "home")
            case $key in
                "up"|"k")
                    if [ $SELECTED_APP -ge 4 ]; then
                        SELECTED_APP=$((SELECTED_APP - 4))
                    fi
                    ;;
                "down"|"j")
                    if [ $SELECTED_APP -lt $((APP_COUNT - 4)) ]; then
                        SELECTED_APP=$((SELECTED_APP + 4))
                    fi
                    ;;
                "left"|"h")
                    if [ $((SELECTED_APP % 4)) -gt 0 ]; then
                        SELECTED_APP=$((SELECTED_APP - 1))
                    fi
                    ;;
                "right"|"l")
                    if [ $((SELECTED_APP % 4)) -lt 3 ] && [ $SELECTED_APP -lt $((APP_COUNT - 1)) ]; then
                        SELECTED_APP=$((SELECTED_APP + 1))
                    fi
                    ;;
                "enter"|" ")
                    CURRENT_SCREEN="${APP_COMMANDS[$SELECTED_APP]}"
                    ;;
                "q"|"Q")
                    echo "Goodbye from BBeOS!"
                    exit 0
                    ;;
            esac
            ;;
        "calculator")
            case $key in
                "esc"|"Escape")
                    CURRENT_SCREEN="home"
                    ;;
                "q"|"Q")
                    CURRENT_SCREEN="home"
                    ;;
            esac
            ;;
        "editor")
            case $key in
                "esc"|"Escape")
                    CURRENT_SCREEN="home"
                    ;;
                "q"|"Q")
                    CURRENT_SCREEN="home"
                    ;;
            esac
            ;;
        "settings")
            case $key in
                "esc"|"Escape")
                    CURRENT_SCREEN="home"
                    ;;
                "q"|"Q")
                    CURRENT_SCREEN="home"
                    ;;
            esac
            ;;
        "info")
            case $key in
                "esc"|"Escape")
                    CURRENT_SCREEN="home"
                    ;;
                "q"|"Q")
                    CURRENT_SCREEN="home"
                    ;;
            esac
            ;;
        *)
            CURRENT_SCREEN="home"
            ;;
    esac
}

# Read keyboard input
read_key() {
    local key
    read -rsn1 key
    
    case $key in
        $'\x1b')
            read -rsn2 key
            case $key in
                "[A") echo "up" ;;
                "[B") echo "down" ;;
                "[C") echo "right" ;;
                "[D") echo "left" ;;
                *) echo "escape" ;;
            esac
            ;;
        "") echo "enter" ;;
        "q"|"Q") echo "q" ;;
        "k"|"K") echo "k" ;;
        "j"|"J") echo "j" ;;
        "h"|"H") echo "h" ;;
        "l"|"L") echo "l" ;;
        " ") echo "space" ;;
        *) echo "$key" ;;
    esac
}

# Main loop
main_loop() {
    log_info "Starting BBeOS Terminal Emulation..."
    log_info "Press Ctrl+C to exit"
    
    # Set terminal to raw mode
    stty -echo -icanon min 1 time 0
    
    # Trap Ctrl+C to restore terminal
    trap 'stty echo icanon; echo; exit 0' INT
    
    while true; do
        case $CURRENT_SCREEN in
            "home")
                draw_home_screen
                ;;
            "calculator")
                draw_calculator
                ;;
            "editor")
                draw_editor
                ;;
            "settings")
                draw_settings
                ;;
            "info")
                draw_system_info
                ;;
            *)
                CURRENT_SCREEN="home"
                ;;
        esac
        
        # Read input
        local key=$(read_key)
        handle_input "$key"
    done
}

# Show help
show_help() {
    echo "BBeOS Terminal Emulation"
    echo "======================="
    echo ""
    echo "This script simulates the BBeOS interface in your Linux terminal."
    echo ""
    echo "Usage: $0 [OPTION]"
    echo ""
    echo "Options:"
    echo "  start    - Start BBeOS emulation (default)"
    echo "  help     - Show this help"
    echo ""
    echo "Controls:"
    echo "  Arrow keys - Navigate"
    echo "  Enter      - Select/Open"
    echo "  Esc        - Back"
    echo "  Q          - Quit"
    echo ""
    echo "Features:"
    echo "  - Home screen with app grid"
    echo "  - Calculator simulation"
    echo "  - Text editor simulation"
    echo "  - Settings screen"
    echo "  - System information"
    echo ""
}

# Main function
main() {
    case "${1:-start}" in
        "start")
            main_loop
            ;;
        "help"|"-h"|"--help")
            show_help
            ;;
        *)
            log_error "Unknown option: $1"
            show_help
            exit 1
            ;;
    esac
}

# Run main function
main "$@"