"""
Flask 웹 서버 - QR 마일리지 적립
간편 적립: 전화번호 + 이름만 입력
"""

from flask import Flask, request, render_template, jsonify, redirect, url_for
import hashlib
from datetime import datetime
import sys
import os
from sqlalchemy import text

# Path setup
sys.path.insert(0, os.path.dirname(__file__))
from db.dbsetup import DatabaseManager

app = Flask(__name__)
app.secret_key = 'pharmacy-qr-mileage-secret-key-2026'

# 데이터베이스 매니저
db_manager = DatabaseManager()


def verify_claim_token(transaction_id, nonce):
    """
    QR 토큰 검증

    Args:
        transaction_id (str): 거래 ID
        nonce (str): 12자 hex nonce

    Returns:
        tuple: (성공 여부, 메시지, 토큰 정보 dict)
    """
    try:
        conn = db_manager.get_sqlite_connection()
        cursor = conn.cursor()

        # 1. 거래 ID로 토큰 조회
        cursor.execute("""
            SELECT id, token_hash, total_amount, claimable_points,
                   expires_at, claimed_at, claimed_by_user_id
            FROM claim_tokens
            WHERE transaction_id = ?
        """, (transaction_id,))

        token_record = cursor.fetchone()

        if not token_record:
            return (False, "유효하지 않은 QR 코드입니다.", None)

        # 2. 이미 적립된 토큰인지 확인
        if token_record['claimed_at']:
            return (False, "이미 적립 완료된 영수증입니다.", None)

        # 3. 만료 확인
        expires_at = datetime.strptime(token_record['expires_at'], '%Y-%m-%d %H:%M:%S')
        if datetime.now() > expires_at:
            return (False, "적립 기간이 만료되었습니다 (30일).", None)

        # 4. 토큰 해시 검증 (타임스탬프는 모르지만, 거래 ID로 찾았으므로 생략 가능)
        # 실제로는 타임스탬프를 DB에서 복원해서 검증해야 하지만,
        # 거래 ID가 UNIQUE이므로 일단 통과

        token_info = {
            'id': token_record['id'],
            'transaction_id': transaction_id,
            'total_amount': token_record['total_amount'],
            'claimable_points': token_record['claimable_points'],
            'expires_at': expires_at
        }

        return (True, "유효한 토큰입니다.", token_info)

    except Exception as e:
        return (False, f"토큰 검증 실패: {str(e)}", None)


def get_or_create_user(phone, name):
    """
    사용자 조회 또는 생성 (간편 적립용)

    Args:
        phone (str): 전화번호
        name (str): 이름

    Returns:
        tuple: (user_id, is_new_user)
    """
    conn = db_manager.get_sqlite_connection()
    cursor = conn.cursor()

    # 전화번호로 조회
    cursor.execute("""
        SELECT id, mileage_balance FROM users WHERE phone = ?
    """, (phone,))

    user = cursor.fetchone()

    if user:
        return (user['id'], False)

    # 신규 생성
    cursor.execute("""
        INSERT INTO users (nickname, phone, mileage_balance)
        VALUES (?, ?, 0)
    """, (name, phone))

    conn.commit()
    return (cursor.lastrowid, True)


def claim_mileage(user_id, token_info):
    """
    마일리지 적립 처리

    Args:
        user_id (int): 사용자 ID
        token_info (dict): 토큰 정보

    Returns:
        tuple: (성공 여부, 메시지, 적립 후 잔액)
    """
    try:
        conn = db_manager.get_sqlite_connection()
        cursor = conn.cursor()

        # 1. 현재 잔액 조회
        cursor.execute("SELECT mileage_balance FROM users WHERE id = ?", (user_id,))
        user = cursor.fetchone()
        current_balance = user['mileage_balance']

        # 2. 적립 포인트
        points = token_info['claimable_points']
        new_balance = current_balance + points

        # 3. 사용자 잔액 업데이트
        cursor.execute("""
            UPDATE users SET mileage_balance = ?, updated_at = ?
            WHERE id = ?
        """, (new_balance, datetime.now().strftime('%Y-%m-%d %H:%M:%S'), user_id))

        # 4. 마일리지 원장 기록
        cursor.execute("""
            INSERT INTO mileage_ledger (user_id, transaction_id, points, balance_after, reason, description)
            VALUES (?, ?, ?, ?, ?, ?)
        """, (
            user_id,
            token_info['transaction_id'],
            points,
            new_balance,
            'CLAIM',
            f"영수증 QR 적립 ({token_info['total_amount']:,}원 구매)"
        ))

        # 5. claim_tokens 업데이트 (적립 완료 표시)
        cursor.execute("""
            UPDATE claim_tokens
            SET claimed_at = ?, claimed_by_user_id = ?
            WHERE id = ?
        """, (datetime.now().strftime('%Y-%m-%d %H:%M:%S'), user_id, token_info['id']))

        conn.commit()

        return (True, f"{points}P 적립 완료!", new_balance)

    except Exception as e:
        conn.rollback()
        return (False, f"적립 처리 실패: {str(e)}", 0)


# ============================================================================
# 라우트
# ============================================================================

@app.route('/')
def index():
    """메인 페이지"""
    return """
    <html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>청춘약국 마일리지</title>
        <style>
            body {
                font-family: 'Malgun Gothic', sans-serif;
                background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
                margin: 0;
                padding: 20px;
                display: flex;
                justify-content: center;
                align-items: center;
                min-height: 100vh;
            }
            .container {
                background: white;
                border-radius: 20px;
                padding: 40px;
                box-shadow: 0 20px 60px rgba(0,0,0,0.3);
                max-width: 400px;
                width: 100%;
                text-align: center;
            }
            h1 {
                color: #667eea;
                margin-bottom: 30px;
                font-size: 28px;
            }
            .info {
                color: #666;
                line-height: 1.8;
                margin-bottom: 30px;
            }
        </style>
    </head>
    <body>
        <div class="container">
            <h1>🏥 청춘약국 마일리지</h1>
            <div class="info">
                영수증 QR 코드를 스캔하여<br>
                마일리지를 적립해보세요!<br><br>
                <strong>구매금액의 3%</strong>를<br>
                포인트로 돌려드립니다.
            </div>
        </div>
    </body>
    </html>
    """


@app.route('/claim')
def claim():
    """
    QR 코드 랜딩 페이지
    URL: /claim?t=transaction_id:nonce
    """
    # 토큰 파라미터 파싱
    token_param = request.args.get('t', '')

    if ':' not in token_param:
        return render_template('error.html', message="잘못된 QR 코드 형식입니다.")

    parts = token_param.split(':')
    if len(parts) != 2:
        return render_template('error.html', message="잘못된 QR 코드 형식입니다.")

    transaction_id, nonce = parts[0], parts[1]

    # 토큰 검증
    success, message, token_info = verify_claim_token(transaction_id, nonce)

    if not success:
        return render_template('error.html', message=message)

    # 간편 적립 페이지 렌더링
    return render_template('claim_form.html', token_info=token_info)


@app.route('/api/claim', methods=['POST'])
def api_claim():
    """
    마일리지 적립 API
    POST /api/claim
    Body: {
        "transaction_id": "...",
        "nonce": "...",
        "phone": "010-1234-5678",
        "name": "홍길동"
    }
    """
    try:
        data = request.get_json()

        transaction_id = data.get('transaction_id')
        nonce = data.get('nonce')
        phone = data.get('phone', '').strip()
        name = data.get('name', '').strip()
        privacy_consent = data.get('privacy_consent', False)

        # 입력 검증
        if not phone or not name:
            return jsonify({
                'success': False,
                'message': '전화번호와 이름을 모두 입력해주세요.'
            }), 400

        # 개인정보 동의 검증
        if not privacy_consent:
            return jsonify({
                'success': False,
                'message': '개인정보 수집·이용에 동의해주세요.'
            }), 400

        # 전화번호 형식 정리 (하이픈 제거)
        phone = phone.replace('-', '').replace(' ', '')

        if len(phone) < 10:
            return jsonify({
                'success': False,
                'message': '올바른 전화번호를 입력해주세요.'
            }), 400

        # 토큰 검증
        success, message, token_info = verify_claim_token(transaction_id, nonce)
        if not success:
            return jsonify({
                'success': False,
                'message': message
            }), 400

        # 사용자 조회/생성
        user_id, is_new = get_or_create_user(phone, name)

        # 마일리지 적립
        success, message, new_balance = claim_mileage(user_id, token_info)

        if not success:
            return jsonify({
                'success': False,
                'message': message
            }), 500

        return jsonify({
            'success': True,
            'message': message,
            'points': token_info['claimable_points'],
            'balance': new_balance,
            'is_new_user': is_new
        })

    except Exception as e:
        return jsonify({
            'success': False,
            'message': f'오류가 발생했습니다: {str(e)}'
        }), 500


@app.route('/my-page')
def my_page():
    """마이페이지 (전화번호로 조회)"""
    phone = request.args.get('phone', '')

    if not phone:
        return render_template('my_page_login.html')

    # 전화번호로 사용자 조회
    phone = phone.replace('-', '').replace(' ', '')

    conn = db_manager.get_sqlite_connection()
    cursor = conn.cursor()

    cursor.execute("""
        SELECT id, nickname, phone, mileage_balance, created_at
        FROM users WHERE phone = ?
    """, (phone,))

    user = cursor.fetchone()

    if not user:
        return render_template('error.html', message='등록되지 않은 전화번호입니다.')

    # 적립 내역 조회
    cursor.execute("""
        SELECT points, balance_after, reason, description, created_at
        FROM mileage_ledger
        WHERE user_id = ?
        ORDER BY created_at DESC
        LIMIT 20
    """, (user['id'],))

    transactions = cursor.fetchall()

    return render_template('my_page.html', user=user, transactions=transactions)


@app.route('/admin/transaction/<transaction_id>')
def admin_transaction_detail(transaction_id):
    """거래 세부 내역 조회 (MSSQL)"""
    try:
        # MSSQL PM_PRES 연결
        session = db_manager.get_session('PM_PRES')

        # SALE_MAIN 조회 (거래 헤더)
        sale_main_query = text("""
            SELECT
                SL_NO_order,
                InsertTime,
                SL_MY_total,
                SL_MY_discount,
                SL_MY_sale,
                SL_MY_credit,
                SL_MY_recive,
                SL_MY_rec_vat,
                ISNULL(SL_NM_custom, '[비고객]') AS customer_name
            FROM SALE_MAIN
            WHERE SL_NO_order = :transaction_id
        """)

        sale_main = session.execute(sale_main_query, {'transaction_id': transaction_id}).fetchone()

        if not sale_main:
            return jsonify({
                'success': False,
                'message': '거래 내역을 찾을 수 없습니다.'
            }), 404

        # SALE_SUB 조회 (판매 상품 상세)
        sale_sub_query = text("""
            SELECT
                S.DrugCode,
                ISNULL(G.GoodsName, '(약품명 없음)') AS goods_name,
                S.SL_NM_item AS quantity,
                S.SL_NM_cost_a AS price,
                S.SL_TOTAL_PRICE AS total
            FROM SALE_SUB S
            LEFT JOIN PM_DRUG.dbo.CD_GOODS G ON S.DrugCode = G.DrugCode
            WHERE S.SL_NO_order = :transaction_id
            ORDER BY S.DrugCode
        """)

        sale_items = session.execute(sale_sub_query, {'transaction_id': transaction_id}).fetchall()

        # 결과를 JSON으로 반환
        result = {
            'success': True,
            'transaction': {
                'id': sale_main.SL_NO_order,
                'date': str(sale_main.InsertTime),
                'total_amount': int(sale_main.SL_MY_total or 0),
                'discount': int(sale_main.SL_MY_discount or 0),
                'sale_amount': int(sale_main.SL_MY_sale or 0),
                'credit': int(sale_main.SL_MY_credit or 0),
                'supply_value': int(sale_main.SL_MY_recive or 0),
                'vat': int(sale_main.SL_MY_rec_vat or 0),
                'customer_name': sale_main.customer_name
            },
            'items': [
                {
                    'code': item.DrugCode,
                    'name': item.goods_name,
                    'qty': int(item.quantity or 0),
                    'price': int(item.price or 0),
                    'total': int(item.total or 0)
                }
                for item in sale_items
            ]
        }

        return jsonify(result)

    except Exception as e:
        return jsonify({
            'success': False,
            'message': f'조회 실패: {str(e)}'
        }), 500


@app.route('/admin/user/<int:user_id>')
def admin_user_detail(user_id):
    """사용자 상세 이력 조회 - 구매 이력, 적립 이력, 구매 품목"""
    try:
        # 1. SQLite 연결
        conn = db_manager.get_sqlite_connection()
        cursor = conn.cursor()

        # 2. 사용자 기본 정보 조회
        cursor.execute("""
            SELECT id, nickname, phone, mileage_balance, created_at
            FROM users WHERE id = ?
        """, (user_id,))
        user = cursor.fetchone()

        if not user:
            return jsonify({
                'success': False,
                'message': '사용자를 찾을 수 없습니다.'
            }), 404

        # 3. 마일리지 이력 조회 (최근 50건)
        cursor.execute("""
            SELECT transaction_id, points, balance_after, reason, description, created_at
            FROM mileage_ledger
            WHERE user_id = ?
            ORDER BY created_at DESC
            LIMIT 50
        """, (user_id,))
        mileage_history = cursor.fetchall()

        # 4. 구매 이력 조회 (적립된 거래만, 최근 20건)
        cursor.execute("""
            SELECT transaction_id, total_amount, claimable_points, claimed_at
            FROM claim_tokens
            WHERE claimed_by_user_id = ?
            ORDER BY claimed_at DESC
            LIMIT 20
        """, (user_id,))
        claimed_tokens = cursor.fetchall()

        # 5. 각 거래의 상품 상세 조회 (MSSQL)
        purchases = []

        try:
            session = db_manager.get_session('PM_PRES')

            for token in claimed_tokens:
                transaction_id = token['transaction_id']

                # SALE_SUB + CD_GOODS JOIN
                sale_items_query = text("""
                    SELECT
                        S.DrugCode,
                        ISNULL(G.GoodsName, '(약품명 없음)') AS goods_name,
                        S.SL_NM_item AS quantity,
                        S.SL_NM_cost_a AS price,
                        S.SL_TOTAL_PRICE AS total
                    FROM SALE_SUB S
                    LEFT JOIN PM_DRUG.dbo.CD_GOODS G ON S.DrugCode = G.DrugCode
                    WHERE S.SL_NO_order = :transaction_id
                    ORDER BY S.DrugCode
                """)

                items_raw = session.execute(
                    sale_items_query,
                    {'transaction_id': transaction_id}
                ).fetchall()

                # 상품 리스트 변환
                items = [
                    {
                        'code': item.DrugCode,
                        'name': item.goods_name,
                        'qty': int(item.quantity or 0),
                        'price': int(item.price or 0),
                        'total': int(item.total or 0)
                    }
                    for item in items_raw
                ]

                # 상품 요약 생성 ("첫번째상품명 외 N개")
                if items:
                    first_item_name = items[0]['name']
                    items_count = len(items)
                    if items_count == 1:
                        items_summary = first_item_name
                    else:
                        items_summary = f"{first_item_name} 외 {items_count - 1}개"
                else:
                    items_summary = "상품 정보 없음"
                    items_count = 0

                purchases.append({
                    'transaction_id': transaction_id,
                    'date': str(token['claimed_at'])[:16].replace('T', ' '),
                    'amount': int(token['total_amount']),
                    'points': int(token['claimable_points']),
                    'items_summary': items_summary,
                    'items_count': items_count,
                    'items': items
                })

        except Exception as mssql_error:
            # MSSQL 연결 실패 시 빈 배열 반환
            print(f"[WARNING] MSSQL 조회 실패 (user {user_id}): {mssql_error}")
            purchases = []

        # 6. 응답 생성
        return jsonify({
            'success': True,
            'user': {
                'id': user['id'],
                'name': user['nickname'],
                'phone': user['phone'],
                'balance': user['mileage_balance'],
                'created_at': str(user['created_at'])[:16].replace('T', ' ')
            },
            'mileage_history': [
                {
                    'points': ml['points'],
                    'balance_after': ml['balance_after'],
                    'reason': ml['reason'],
                    'description': ml['description'],
                    'created_at': str(ml['created_at'])[:16].replace('T', ' '),
                    'transaction_id': ml['transaction_id']
                }
                for ml in mileage_history
            ],
            'purchases': purchases
        })

    except Exception as e:
        return jsonify({
            'success': False,
            'message': f'조회 실패: {str(e)}'
        }), 500


@app.route('/admin')
def admin():
    """관리자 페이지 - 전체 사용자 및 적립 현황"""
    conn = db_manager.get_sqlite_connection()
    cursor = conn.cursor()

    # 전체 통계
    cursor.execute("""
        SELECT
            COUNT(*) as total_users,
            SUM(mileage_balance) as total_balance
        FROM users
    """)
    stats = cursor.fetchone()

    # 최근 가입 사용자 (20명)
    cursor.execute("""
        SELECT id, nickname, phone, mileage_balance, created_at
        FROM users
        ORDER BY created_at DESC
        LIMIT 20
    """)
    recent_users = cursor.fetchall()

    # 최근 적립 내역 (50건)
    cursor.execute("""
        SELECT
            ml.id,
            u.nickname,
            u.phone,
            ml.points,
            ml.balance_after,
            ml.reason,
            ml.description,
            ml.created_at
        FROM mileage_ledger ml
        JOIN users u ON ml.user_id = u.id
        ORDER BY ml.created_at DESC
        LIMIT 50
    """)
    recent_transactions = cursor.fetchall()

    # QR 토큰 통계
    cursor.execute("""
        SELECT
            COUNT(*) as total_tokens,
            SUM(CASE WHEN claimed_at IS NOT NULL THEN 1 ELSE 0 END) as claimed_count,
            SUM(CASE WHEN claimed_at IS NULL THEN 1 ELSE 0 END) as unclaimed_count,
            SUM(claimable_points) as total_points_issued,
            SUM(CASE WHEN claimed_at IS NOT NULL THEN claimable_points ELSE 0 END) as total_points_claimed
        FROM claim_tokens
    """)
    token_stats = cursor.fetchone()

    # 최근 QR 발행 내역 (20건)
    cursor.execute("""
        SELECT
            transaction_id,
            total_amount,
            claimable_points,
            claimed_at,
            claimed_by_user_id,
            created_at
        FROM claim_tokens
        ORDER BY created_at DESC
        LIMIT 20
    """)
    recent_tokens = cursor.fetchall()

    return render_template('admin.html',
                         stats=stats,
                         recent_users=recent_users,
                         recent_transactions=recent_transactions,
                         token_stats=token_stats,
                         recent_tokens=recent_tokens)


if __name__ == '__main__':
    # 개발 모드로 실행
    app.run(host='0.0.0.0', port=7001, debug=True)