#!/usr/bin/env bash
# ============================================================================
# BLACKROAD OS, INC. - PROPRIETARY AND CONFIDENTIAL
# BlackRoad Quantum Computing Visualizer
# Real-time quantum circuit and qubit state visualization
# ============================================================================

set -e

# Color functions (printf-based, escape-safe)
c_pink()   { printf '\033[38;5;205m'; }
c_blue()   { printf '\033[38;5;75m'; }
c_green()  { printf '\033[38;5;82m'; }
c_yellow() { printf '\033[38;5;226m'; }
c_red()    { printf '\033[38;5;196m'; }
c_purple() { printf '\033[38;5;141m'; }
c_orange() { printf '\033[38;5;208m'; }
c_gray()   { printf '\033[38;5;240m'; }
c_cyan()   { printf '\033[38;5;87m'; }
c_magenta(){ printf '\033[38;5;201m'; }
c_reset()  { printf '\033[0m'; }
c_clear()  { printf '\033[2J\033[H'; }
c_bold()   { printf '\033[1m'; }

# ==================
# QUANTUM STATE GENERATION
# ==================

generate_qubit_state() {
    # Generate random quantum state (|0⟩, |1⟩, superposition)
    local state=$((RANDOM % 3))
    case $state in
        0) echo "0" ;;  # |0⟩
        1) echo "1" ;;  # |1⟩
        2) echo "+" ;;  # |+⟩ superposition
    esac
}

generate_bloch_sphere_coords() {
    # Generate random point on Bloch sphere
    local theta=$(awk -v seed=$RANDOM 'BEGIN{srand(seed); print rand() * 3.14159}')
    local phi=$(awk -v seed=$RANDOM 'BEGIN{srand(seed); print rand() * 6.28318}')
    echo "$theta|$phi"
}

calculate_fidelity() {
    # Random fidelity between 0.90 and 0.99
    awk -v seed=$RANDOM 'BEGIN{srand(seed); printf "%.4f", 0.90 + rand() * 0.09}'
}

# ==================
# DISPLAY COMPONENTS
# ==================

draw_header() {
    c_clear
    c_magenta; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║                                                                                ║\n"
    printf "║                  BLACKROAD OS - QUANTUM COMPUTING VISUALIZER                   ║\n"
    printf "║                                                                                ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    printf "\n"
}

draw_quantum_circuit() {
    local qubit_count="${1:-3}"
    
    c_cyan; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║ ⚛️  QUANTUM CIRCUIT                                                             ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    
    printf "\n"
    
    # Generate random circuit with gates
    for ((i=0; i<qubit_count; i++)); do
        printf "  "
        c_blue; printf "q%d" "$i"; c_reset
        printf " ─"
        
        # Add random gates
        local gate_count=$((2 + RANDOM % 4))
        for ((g=0; g<gate_count; g++)); do
            local gate=$((RANDOM % 6))
            case $gate in
                0)
                    c_green; printf "┤H├"; c_reset  # Hadamard
                    ;;
                1)
                    c_yellow; printf "┤X├"; c_reset  # Pauli-X
                    ;;
                2)
                    c_orange; printf "┤Y├"; c_reset  # Pauli-Y
                    ;;
                3)
                    c_red; printf "┤Z├"; c_reset     # Pauli-Z
                    ;;
                4)
                    c_purple; printf "┤T├"; c_reset  # T gate
                    ;;
                5)
                    c_cyan; printf "┤S├"; c_reset    # S gate
                    ;;
            esac
            printf "─"
        done
        
        # Add measurement
        c_magenta; printf "┤M├"; c_reset
        printf "\n"
    done
    
    printf "\n"
    
    # Legend
    printf "  "
    c_gray; printf "Gates: "; c_reset
    c_green; printf "H"; c_reset; printf "(adamard) "
    c_yellow; printf "X"; c_reset; printf "(NOT) "
    c_orange; printf "Y"; c_reset; printf "(Pauli-Y) "
    c_red; printf "Z"; c_reset; printf "(Phase) "
    c_purple; printf "T"; c_reset; printf "(π/8) "
    c_cyan; printf "S"; c_reset; printf "(Phase) "
    c_magenta; printf "M"; c_reset; printf "(easure)"
    printf "\n\n"
}

draw_qubit_states() {
    local qubit_count="${1:-5}"
    
    c_purple; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║ 📊 QUBIT STATES                                                                ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    
    printf "\n"
    
    # Header
    printf "  "
    c_gray
    printf "%-8s %-12s %-15s %-15s %-12s\n" "Qubit" "State" "Amplitude" "Phase" "Fidelity"
    c_reset
    
    printf "  "
    c_gray
    printf "─────────────────────────────────────────────────────────────────────────────\n"
    c_reset
    
    # Generate states for each qubit
    for ((i=0; i<qubit_count; i++)); do
        local state=$(generate_qubit_state)
        local amp0=$(awk -v seed=$RANDOM 'BEGIN{srand(seed); printf "%.3f", rand()}')
        local amp1=$(awk "BEGIN{printf \"%.3f\", sqrt(1 - $amp0 * $amp0)}")
        local phase=$(awk -v seed=$RANDOM 'BEGIN{srand(seed); printf "%.2f", rand() * 6.28}')
        local fidelity=$(calculate_fidelity)
        
        printf "  "
        c_blue; printf "q%-7d" "$i"; c_reset
        
        # State representation
        case $state in
            "0")
                c_green; printf "%-12s" "|0⟩"; c_reset
                ;;
            "1")
                c_red; printf "%-12s" "|1⟩"; c_reset
                ;;
            "+")
                c_yellow; printf "%-12s" "|+⟩ (super)"; c_reset
                ;;
        esac
        
        # Amplitude
        c_cyan; printf "%-15s" "${amp0}|0⟩+${amp1}|1⟩"; c_reset
        
        # Phase
        c_purple; printf "%-15s" "${phase} rad"; c_reset
        
        # Fidelity with color coding
        if (( $(echo "$fidelity > 0.95" | bc -l) )); then
            c_green
        elif (( $(echo "$fidelity > 0.92" | bc -l) )); then
            c_yellow
        else
            c_red
        fi
        printf "%-12s" "$fidelity"
        c_reset
        
        printf "\n"
    done
    
    printf "\n"
}

draw_bloch_sphere() {
    c_orange; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║ 🌐 BLOCH SPHERE REPRESENTATION                                                 ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    
    printf "\n"
    
    # ASCII Bloch sphere
    c_gray
    printf "                          |z⟩ (|0⟩)\n"
    printf "                           │\n"
    printf "                           │\n"
    printf "                          ╱│╲\n"
    printf "                        ╱  │  ╲\n"
    printf "                      ╱    │    ╲\n"
    printf "                    ╱      │      ╲\n"
    printf "          |y⟩ ────╱────────┼────────╲──── |x⟩\n"
    printf "                 ╲         │         ╱\n"
    printf "                   ╲       │       ╱\n"
    c_reset
    
    # Plot qubit positions
    c_magenta; printf "                     ╲     "; c_green; printf "●"; c_reset; c_gray; printf " q0   ╱\n"; c_reset
    c_gray; printf "                       ╲    "; c_reset; c_yellow; printf "●"; c_reset; c_gray; printf " q1 ╱\n"; c_reset
    c_gray; printf "                         ╲ "; c_reset; c_cyan; printf "●"; c_reset; c_gray; printf " q2╱\n"; c_reset
    c_gray; printf "                           ╲│╱\n"; c_reset
    c_gray; printf "                            │\n"; c_reset
    c_gray; printf "                            │\n"; c_reset
    c_gray; printf "                         |-z⟩ (|1⟩)\n"; c_reset
    
    printf "\n"
    
    printf "  "
    c_gray; printf "Sphere shows qubit states in 3D space: "; c_reset
    printf "\n  "
    c_gray; printf "• North pole: "; c_reset; c_green; printf "|0⟩"; c_reset
    printf "  "
    c_gray; printf "• South pole: "; c_reset; c_red; printf "|1⟩"; c_reset
    printf "  "
    c_gray; printf "• Equator: "; c_reset; c_yellow; printf "superposition"; c_reset
    printf "\n\n"
}

draw_entanglement_status() {
    c_pink; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║ 🔗 ENTANGLEMENT STATUS                                                         ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    
    printf "\n"
    
    # Show entangled pairs
    local pair_count=$((1 + RANDOM % 3))
    
    for ((i=0; i<pair_count; i++)); do
        local q1=$((RANDOM % 5))
        local q2=$((RANDOM % 5))
        
        if [ $q1 -eq $q2 ]; then
            q2=$(( (q2 + 1) % 5 ))
        fi
        
        local entanglement=$(calculate_fidelity)
        
        printf "  "
        c_magenta; printf "●"; c_reset
        printf " "
        c_blue; printf "q%d" "$q1"; c_reset
        printf " ⟷ "
        c_blue; printf "q%d" "$q2"; c_reset
        printf "  "
        c_gray; printf "Entanglement: "; c_reset
        
        if (( $(echo "$entanglement > 0.95" | bc -l) )); then
            c_green; printf "%s" "$entanglement"; c_reset
            printf " "
            c_green; printf "(Strong)"; c_reset
        else
            c_yellow; printf "%s" "$entanglement"; c_reset
            printf " "
            c_yellow; printf "(Moderate)"; c_reset
        fi
        
        printf "\n"
    done
    
    printf "\n"
    printf "  "
    c_gray; printf "Bell state: "; c_reset
    c_cyan; printf "(|00⟩ + |11⟩)/√2"; c_reset
    printf "\n\n"
}

draw_quantum_metrics() {
    c_blue; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║ 📈 QUANTUM METRICS                                                             ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    
    printf "\n"
    
    # Gate count
    local gate_count=$((50 + RANDOM % 100))
    printf "  "
    c_purple; printf "Total Gates:        "; c_reset
    c_cyan; printf "%d\n" "$gate_count"; c_reset
    
    # Circuit depth
    local depth=$((5 + RANDOM % 10))
    printf "  "
    c_purple; printf "Circuit Depth:      "; c_reset
    c_cyan; printf "%d\n" "$depth"; c_reset
    
    # Estimated time
    local exec_time=$(awk -v seed=$RANDOM 'BEGIN{srand(seed); printf "%.2f", rand() * 5}')
    printf "  "
    c_purple; printf "Execution Time:     "; c_reset
    c_cyan; printf "%s ms\n" "$exec_time"; c_reset
    
    # Success probability
    local success=$(awk -v seed=$RANDOM 'BEGIN{srand(seed); printf "%.1f", 85 + rand() * 14}')
    printf "  "
    c_purple; printf "Success Probability: "; c_reset
    
    if (( $(echo "$success > 95" | bc -l) )); then
        c_green; printf "%s%%\n" "$success"; c_reset
    elif (( $(echo "$success > 90" | bc -l) )); then
        c_yellow; printf "%s%%\n" "$success"; c_reset
    else
        c_red; printf "%s%%\n" "$success"; c_reset
    fi
    
    # Quantum volume
    local volume=$((2 ** (3 + RANDOM % 4)))
    printf "  "
    c_purple; printf "Quantum Volume:     "; c_reset
    c_cyan; printf "%d\n" "$volume"; c_reset
    
    printf "\n"
}

draw_algorithm_info() {
    c_green; c_bold
    printf "╔════════════════════════════════════════════════════════════════════════════════╗\n"
    printf "║ 🧮 ACTIVE ALGORITHM                                                            ║\n"
    printf "╚════════════════════════════════════════════════════════════════════════════════╝\n"
    c_reset
    
    printf "\n"
    
    # Random algorithm
    local algorithms=(
        "Shor's Factorization|Factors large integers exponentially faster"
        "Grover's Search|Quadratic speedup for unstructured search"
        "Quantum Fourier Transform|Phase estimation and period finding"
        "Variational Quantum Eigensolver|Ground state energy calculation"
        "Quantum Phase Estimation|Eigenvalue extraction"
    )
    
    local algo_idx=$((RANDOM % ${#algorithms[@]}))
    local algo="${algorithms[$algo_idx]}"
    IFS='|' read -r name desc <<< "$algo"
    
    printf "  "
    c_cyan; c_bold; printf "Algorithm: "; c_reset
    c_green; printf "%s\n" "$name"; c_reset
    
    printf "  "
    c_cyan; printf "Purpose:   "; c_reset
    c_gray; printf "%s\n" "$desc"; c_reset
    
    printf "\n"
}

draw_footer() {
    local timestamp="$1"
    
    printf "\n"
    c_gray
    printf "═══════════════════════════════════════════════════════════════════════════════\n"
    printf "Quantum simulation | Last updated: %s | Press Ctrl+C to exit\n" "$timestamp"
    c_reset
}

# ==================
# MAIN DASHBOARD
# ==================

run_dashboard() {
    local refresh_interval="${1:-3}"
    
    while true; do
        draw_header
        draw_quantum_circuit 3
        draw_qubit_states 5
        draw_bloch_sphere
        draw_entanglement_status
        draw_quantum_metrics
        draw_algorithm_info
        
        local timestamp=$(date "+%Y-%m-%d %H:%M:%S")
        draw_footer "$timestamp"
        
        sleep "$refresh_interval"
    done
}

# ==================
# CLI INTERFACE
# ==================

show_help() {
    cat <<'HELP'
BlackRoad Quantum Computing Visualizer

USAGE:
  blackroad-quantum-dashboard.sh [OPTIONS]

OPTIONS:
  --interval N    Refresh interval in seconds (default: 3)
  --once          Run once and exit (no loop)
  --qubits N      Number of qubits to simulate (default: 5)
  --help          Show this help

EXAMPLES:
  blackroad-quantum-dashboard.sh                # Live visualization
  blackroad-quantum-dashboard.sh --once         # Single snapshot
  blackroad-quantum-dashboard.sh --interval 1   # Fast refresh

VISUALIZATIONS:
  • Quantum circuit diagram with gates
  • Qubit states with amplitudes and phases
  • Bloch sphere representation
  • Entanglement status between qubits
  • Quantum metrics (depth, gates, volume)
  • Active algorithm information

QUANTUM GATES SHOWN:
  H - Hadamard (creates superposition)
  X - Pauli-X (quantum NOT)
  Y - Pauli-Y (bit and phase flip)
  Z - Pauli-Z (phase flip)
  T - T gate (π/8 rotation)
  S - S gate (phase gate)
  M - Measurement

Press Ctrl+C to exit live mode.
HELP
}

# ==================
# MAIN
# ==================

main() {
    local interval=3
    local once=false
    local qubits=5
    
    while [[ $# -gt 0 ]]; do
        case "$1" in
            --interval)
                interval="$2"
                shift 2
                ;;
            --once)
                once=true
                shift
                ;;
            --qubits)
                qubits="$2"
                shift 2
                ;;
            --help|-h)
                show_help
                exit 0
                ;;
            *)
                echo "Unknown option: $1"
                show_help
                exit 1
                ;;
        esac
    done
    
    if $once; then
        draw_header
        draw_quantum_circuit 3
        draw_qubit_states "$qubits"
        draw_bloch_sphere
        draw_entanglement_status
        draw_quantum_metrics
        draw_algorithm_info
        
        local timestamp=$(date "+%Y-%m-%d %H:%M:%S")
        c_gray
        printf "\nSnapshot taken at %s\n" "$timestamp"
        c_reset
    else
        run_dashboard "$interval"
    fi
}

main "$@"