"""PAAI ESC/POS 프린터 CLI - EUC-KR 텍스트 방식"""
import sys
import json
import socket
from datetime import datetime

# 프린터 설정
PRINTER_IP = "192.168.0.174"
PRINTER_PORT = 9100

# ESC/POS 명령어
ESC = b'\x1b'
INIT = ESC + b'@'           # 프린터 초기화
CUT = ESC + b'd\x03'        # 피드 + 커트


def print_raw(data: bytes) -> bool:
    """바이트 데이터를 프린터로 전송"""
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(10)
        sock.connect((PRINTER_IP, PRINTER_PORT))
        sock.sendall(data)
        sock.close()
        return True
    except Exception as e:
        print(f"프린터 오류: {e}", file=sys.stderr)
        return False


def wrap_text(text: str, width: int = 44) -> list:
    """텍스트 줄바꿈 (44자 기준, 들여쓰기 고려)"""
    if not text:
        return []
    
    lines = []
    words = text.split()
    current = ""
    
    for word in words:
        if len(current) + len(word) + 1 <= width:
            current = current + " " + word if current else word
        else:
            if current:
                lines.append(current)
            current = word
    
    if current:
        lines.append(current)
    
    return lines if lines else [text[:width]]


def center_text(text: str, width: int = 48) -> str:
    """중앙 정렬"""
    text_len = len(text)
    if text_len >= width:
        return text
    spaces = (width - text_len) // 2
    return " " * spaces + text


def format_paai_receipt(pre_serial: str, patient_name: str, 
                        analysis: dict, kims_summary: dict) -> str:
    """PAAI 복약안내 영수증 텍스트 생성 (48자 기준)"""
    
    LINE = "=" * 48
    THIN = "-" * 48
    now = datetime.now().strftime("%Y-%m-%d %H:%M")
    
    # 헤더
    msg = f"\n{LINE}\n"
    msg += center_text("[ PAAI 복약안내 ]") + "\n"
    msg += f"{LINE}\n"
    
    # 환자 정보
    msg += f"환자: {patient_name}\n"
    msg += f"처방번호: {pre_serial}\n"
    msg += f"출력: {now}\n"
    msg += f"{THIN}\n"
    
    # 상호작용 요약
    interaction_count = kims_summary.get('interaction_count', 0)
    has_severe = kims_summary.get('has_severe', False)
    
    if has_severe:
        msg += "[!!] 중증 상호작용 있음!\n"
    elif interaction_count > 0:
        msg += f"[!] 약물 상호작용: {interaction_count}건\n"
    else:
        msg += "[V] 상호작용 없음\n"
    msg += "\n"
    
    # 처방 해석
    insight = analysis.get('prescription_insight', '')
    if insight:
        msg += f"{THIN}\n"
        msg += ">> 처방 해석\n"
        for line in wrap_text(insight, 44):
            msg += f"  {line}\n"
        msg += "\n"
    
    # 복용 주의사항
    cautions = analysis.get('cautions', [])
    if cautions:
        msg += f"{THIN}\n"
        msg += ">> 복용 주의사항\n"
        for i, caution in enumerate(cautions[:4], 1):
            # 첫 줄
            first_line = True
            for line in wrap_text(f"{i}. {caution}", 44):
                if first_line:
                    msg += f"  {line}\n"
                    first_line = False
                else:
                    msg += f"     {line}\n"
        msg += "\n"
    
    # 상담 포인트
    counseling = analysis.get('counseling_points', [])
    if counseling:
        msg += f"{THIN}\n"
        msg += ">> 상담 포인트\n"
        for i, point in enumerate(counseling[:3], 1):
            first_line = True
            for line in wrap_text(f"{i}. {point}", 44):
                if first_line:
                    msg += f"  {line}\n"
                    first_line = False
                else:
                    msg += f"     {line}\n"
        msg += "\n"
    
    # OTC 추천
    otc_recs = analysis.get('otc_recommendations', [])
    if otc_recs:
        msg += f"{THIN}\n"
        msg += ">> OTC 추천\n"
        for rec in otc_recs[:2]:
            product = rec.get('product', '')
            reason = rec.get('reason', '')
            msg += f"  - {product}\n"
            for line in wrap_text(reason, 42):
                msg += f"    {line}\n"
        msg += "\n"
    
    # 푸터
    msg += f"{LINE}\n"
    msg += center_text("양구청춘약국 PAAI") + "\n"
    msg += center_text("Tel: 033-481-5222") + "\n"
    msg += "\n"
    
    return msg


def print_paai_receipt(data: dict) -> bool:
    """PAAI 영수증 인쇄"""
    try:
        pre_serial = data.get('pre_serial', '')
        patient_name = data.get('patient_name', '')
        analysis = data.get('analysis', {})
        kims_summary = data.get('kims_summary', {})
        
        # 텍스트 생성
        message = format_paai_receipt(pre_serial, patient_name, analysis, kims_summary)
        
        # EUC-KR 인코딩 (한글 지원)
        text_bytes = message.encode('euc-kr', errors='replace')
        
        # 명령어 조합
        command = INIT + text_bytes + b'\n\n\n' + CUT
        
        return print_raw(command)
    except Exception as e:
        print(f"인쇄 오류: {e}", file=sys.stderr)
        return False


def main():
    if len(sys.argv) < 2:
        print("사용법: python paai_printer_cli.py <json_file>", file=sys.stderr)
        sys.exit(1)
    
    json_path = sys.argv[1]
    
    try:
        with open(json_path, 'r', encoding='utf-8') as f:
            data = json.load(f)
        
        if print_paai_receipt(data):
            print("인쇄 완료")
            sys.exit(0)
        else:
            sys.exit(1)
    except Exception as e:
        print(f"오류: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == '__main__':
    main()