from datetime import datetime, timedelta
from appPublic.qr import gen_qr_withlogo
from appPublic.uniqueID import getID
from appPublic.jsonConfig import getConfig
from appPublic.dictObject import DictObject
from sqlor.dbpools import DBPools
from ahserver.serverenv import ServerEnv
from ahserver.filestorage import FileStorage


async def discount_qrcode(request, params_kw):
    """
    Generate a promotional QR code for discount
    discount less then 1 and greate then 0
    valid_term is digit + one of ["D", "M", "Y"]
    expired_date is a date after it the promote qrcode invalidable
    """
    discount = params_kw.discount
    valid_term = params_kw.valid_term
    expired_date = params_kw.expired_date
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    config = getConfig()
    db = DBPools()
    db.databases = config.databases
    resellerid = await env.get_userorgid()
    qr_id = getID()
    url = env.entire_url('./promote') + f'?id={qr_id}'
    fs = FileStorage()
    p = fs._name2path(f'{getID()}.png')
    gen_qr_withlogo(url, p, logopath=config.logopath, logoloc='cc')
    webp = fs.webpath(p)
    async with db.sqlorContext(dbname) as sor:
        biz_date = await env.get_business_date(sor)
        if biz_date >= expired_date:
            raise Exception('Promote QRCODE is out of time')

        ret = {
            'id': qr_id,
            'resellerid': resellerid,
            'discount': discount,
            'valid_term': valid_term,
            'expired_date': expired_date,
            'qr_webpath': webp
        }
        await sor.C('discount_qr', ret.copy())
        return DictObject(**ret)
    return None


async def set_promote_discount(request, params_kw):
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    config = getConfig()
    db = DBPools()
    db.databases = config.databases
    id = params_kw.id
    customerid = await env.get_userorgid()
    async with db.sqlorContext(dbname) as sor:
        recs = await sor.R('discount_qr', {'id': id})
        if not recs:
            raise Exception(f'promote id({id}) not exists')
        biz_date = await env.get_business_date(sor)
        if recs[0].expired_date <= biz_date:
            raise Exception('Promote QRCODE is out of time')
        cnt = int(recs[0].valid_term[:-1])
        unit = recs[0].valid_term[-1]
        enabled_date = biz_date
        expired_date = ''
        if unit == 'D':
            expired_date = env.strdate_add(enabled_date, days=cnt)
        elif unit == 'M':
            expired_date = env.strdate_add(enabled_date, months=cnt)
        elif unit == 'Y':
            expired_date = env.strdate_add(enabled_date, years=cnt)
        else:
            raise Exception(f'Invalid valid_term({recs[0].valid_term})')

        # Disable old active discount for this customer
        await disable_old_discount(sor, recs[0].resellerid, customerid, biz_date)

        # Create new discount record (no longer stores discount value directly)
        discountid = getID()
        ret = {
            'id': discountid,
            'name': f'促销折扣-{biz_date}',
            'resellerid': recs[0].resellerid,
            'customerid': customerid,
            'enabled_date': enabled_date,
            'expired_date': expired_date
        }
        await sor.C('discount', ret.copy())

        # Create discount_detail record with the discount value from QR code
        # prodtypeid=None, productid=None means applies to all products
        detail_ret = {
            'id': getID(),
            'discountid': discountid,
            'resellerid': recs[0].resellerid,
            'prodtypeid': None,
            'productid': None,
            'discount': recs[0].discount,
        }
        await sor.C('discount_detail', detail_ret.copy())

        return recs[0].discount
    return None


async def disable_old_discount(sor, resellerid, customerid, biz_date):
    """Disable any active discount record for the given reseller+customer pair."""
    # Use sor.R with sort instead of raw SQL + FOR UPDATE (DB-agnostic)
    recs = await sor.R('discount', {
        'resellerid': resellerid,
        'customerid': customerid,
        'sort': 'enabled_date desc'
    })
    if not recs:
        return
    # Find the active one in Python (DB-agnostic date comparison)
    for rec in recs:
        if rec.get('enabled_date', '') <= biz_date and rec.get('expired_date', '') > biz_date:
            await sor.U('discount', {'id': rec['id'], 'expired_date': biz_date})
            return


async def _discount_detail_exists(sor):
    """Check if discount_detail table exists."""
    try:
        await sor.sqlExe("SELECT 1 FROM discount_detail LIMIT 0", {})
        return True
    except Exception:
        return False


async def sor_get_star_discount(sor, resellerid, biz_date):
    """Get default discount for a reseller (no specific customer)."""
    sql = """select d.id, d.discount from discount d
where d.resellerid = ${resellerid}$
    and d.customerid is NULL
    and d.enabled_date <= ${biz_date}$
    and d.expired_date > ${biz_date}$"""
    ns = {
        "resellerid": resellerid,
        "biz_date": biz_date
    }
    recs = await sor.sqlExe(sql, ns)
    if not recs:
        return 1

    discountid = recs[0].id
    # If discount_detail table exists, look up default detail
    if await _discount_detail_exists(sor):
        sql2 = """select discount from discount_detail
where discountid = ${discountid}$
    and prodtypeid is NULL
    and productid is NULL"""
        recs2 = await sor.sqlExe(sql2, {'discountid': discountid})
        if not recs2:
            return 1
        return recs2[0].discount
    # Fallback: read discount value directly from discount table
    return recs[0].discount if recs[0].discount is not None else 1


async def sor_get_customer_discount(sor, resellerid, customerid):
    """Get discount record for a customer (legacy, returns record not value).
    Use sor_get_product_discount for product-specific discount."""
    env = ServerEnv()
    biz_date = await env.get_business_date(sor)
    sql = """select * from discount
where resellerid = ${resellerid}$
    and customerid = ${customerid}$
    and enabled_date <= ${biz_date}$
    and expired_date > ${biz_date}$"""
    ns = {
        "resellerid": resellerid,
        "customerid": customerid,
        "biz_date": biz_date
    }
    recs = await sor.sqlExe(sql, ns)
    if not recs:
        return await sor_get_star_discount(sor, resellerid, biz_date)

    # Return default discount for this customer (prodtypeid=None, productid=None)
    discountid = recs[0].id
    if await _discount_detail_exists(sor):
        sql2 = """select discount from discount_detail
where discountid = ${discountid}$
    and prodtypeid is NULL
    and productid is NULL"""
        recs2 = await sor.sqlExe(sql2, {'discountid': discountid})
        if not recs2:
            return 1
        return recs2[0].discount
    # Fallback: read discount value directly from discount table
    return recs[0].discount if recs[0].discount is not None else 1


async def sor_get_product_discount(sor, resellerid, customerid, prodtypeid, productid):
    """
    Get product-specific discount.
    Lookup priority:
    1. Exact match: discountid -> (prodtypeid, productid)
    2. Type-level match: discountid -> (prodtypeid, NULL)
    3. Default match: discountid -> (NULL, NULL)

    Returns discount value (float), default 1.0 (no discount).
    """
    env = ServerEnv()
    biz_date = await env.get_business_date(sor)

    # Step 1: Find active discount record for reseller+customer
    sql = """select id from discount
where resellerid = ${resellerid}$
    and customerid = ${customerid}$
    and enabled_date <= ${biz_date}$
    and expired_date > ${biz_date}$"""
    ns = {
        "resellerid": resellerid,
        "customerid": customerid,
        "biz_date": biz_date
    }
    recs = await sor.sqlExe(sql, ns)
    if not recs:
        # Try reseller-level default (customerid is NULL)
        sql = """select id from discount
where resellerid = ${resellerid}$
    and customerid is NULL
    and enabled_date <= ${biz_date}$
    and expired_date > ${biz_date}$"""
        recs = await sor.sqlExe(sql, ns)
    if not recs:
        return 1.0

    discountid = recs[0].id

    # If discount_detail table doesn't exist, fall back to discount.discount
    if not await _discount_detail_exists(sor):
        return recs[0].discount if recs[0].discount is not None else 1.0

    # Step 2: Try exact product match
    sql2 = """select discount from discount_detail
where discountid = ${discountid}$
    and prodtypeid = ${prodtypeid}$
    and productid = ${productid}$"""
    recs2 = await sor.sqlExe(sql2, {
        'discountid': discountid,
        'prodtypeid': prodtypeid,
        'productid': productid
    })
    if recs2:
        return recs2[0].discount

    # Step 3: Try product type level match (productid is NULL)
    sql3 = """select discount from discount_detail
where discountid = ${discountid}$
    and prodtypeid = ${prodtypeid}$
    and productid is NULL"""
    recs3 = await sor.sqlExe(sql3, {
        'discountid': discountid,
        'prodtypeid': prodtypeid,
    })
    if recs3:
        return recs3[0].discount

    # Step 4: Try default match (both NULL)
    sql4 = """select discount from discount_detail
where discountid = ${discountid}$
    and prodtypeid is NULL
    and productid is NULL"""
    recs4 = await sor.sqlExe(sql4, {'discountid': discountid})
    if recs4:
        return recs4[0].discount

    return 1.0


async def get_customer_discount(resellerid, customerid):
    """Legacy: get default discount for a customer (all products)."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    config = getConfig()
    db = DBPools()
    db.databases = config.databases
    async with db.sqlorContext(dbname) as sor:
        return await sor_get_customer_discount(sor, resellerid, customerid)
    return 1


async def get_product_discount(resellerid, customerid, prodtypeid, productid):
    """
    Get product-specific discount.
    Parameters:
        resellerid: merchant ID
        customerid: customer ID
        prodtypeid: product type ID
        productid: product ID
    Returns: discount value (float), 1.0 means no discount.
    """
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    config = getConfig()
    db = DBPools()
    db.databases = config.databases
    async with db.sqlorContext(dbname) as sor:
        return await sor_get_product_discount(sor, resellerid, customerid, prodtypeid, productid)
    return 1.0


async def get_discount_details(sor, discountid):
    """Get all product detail records for a given discount."""
    sql = """select * from discount_detail
where discountid = ${discountid}$
order by prodtypeid, productid"""
    recs = await sor.sqlExe(sql, {'discountid': discountid})
    return recs


async def add_discount_detail(sor, discountid, resellerid, prodtypeid, productid, discount):
    """Add a product-specific discount detail."""
    if discount <= 0 or discount > 1:
        raise Exception(f'discount({discount}) invalid, must be between 0 and 1 (inclusive)')

    ret = {
        'id': getID(),
        'discountid': discountid,
        'resellerid': resellerid,
        'prodtypeid': prodtypeid if prodtypeid else None,
        'productid': productid if productid else None,
        'discount': discount,
    }
    await sor.C('discount_detail', ret.copy())
    return ret


async def update_discount_detail(sor, detail_id, discount):
    """Update a discount detail record."""
    if discount <= 0 or discount > 1:
        raise Exception(f'discount({discount}) invalid, must be between 0 and 1 (inclusive)')

    await sor.U('discount_detail', {'id': detail_id, 'discount': discount})


async def delete_discount_detail(sor, detail_id):
    """Delete a discount detail record."""
    await sor.D('discount_detail', {'id': detail_id})


# ─── Marketing & Promo Code & Customer Bind ───

async def create_marketing(request, params_kw):
    """Create a marketing plan (reseller operator only)."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    resellerid = await env.get_userorgid()
    user_id = await env.get_user()
    name = params_kw.get('name')
    enabled_date = params_kw.get('enabled_date')
    expired_date = params_kw.get('expired_date')
    
    if not name:
        return {'status': 'error', 'message': 'Missing name'}
    
    async with DBPools().sqlorContext(dbname) as sor:
        marketing_id = getID()
        await sor.C('discount_marketing', {
            'id': marketing_id,
            'resellerid': resellerid,
            'name': name,
            'enabled_date': enabled_date,
            'expired_date': expired_date,
            'status': '1',
            'created_by': user_id,
        })
        
        # Also create a discount record linked to this marketing
        discount_id = getID()
        await sor.C('discount', {
            'id': discount_id,
            'name': f'营销方案-{name}',
            'resellerid': resellerid,
            'customerid': None,  # applies to all customers of this reseller
            'enabled_date': enabled_date,
            'expired_date': expired_date,
        })
        
        return {'status': 'success', 'id': marketing_id, 'discount_id': discount_id}


async def update_marketing(request, params_kw):
    """Update a marketing plan."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    marketing_id = params_kw.get('id')
    resellerid = await env.get_userorgid()
    
    if not marketing_id:
        return {'status': 'error', 'message': 'Missing id'}
    
    async with DBPools().sqlorContext(dbname) as sor:
        # Verify ownership
        recs = await sor.R('discount_marketing', {'id': marketing_id, 'resellerid': resellerid})
        if not recs:
            return {'status': 'error', 'message': 'Marketing not found or no access'}
        
        update_data = {'id': marketing_id}
        for field in ['name', 'enabled_date', 'expired_date', 'status']:
            if field in params_kw:
                update_data[field] = params_kw[field]
        
        await sor.U('discount_marketing', update_data)
        return {'status': 'success', 'id': marketing_id}


async def delete_marketing(request, params_kw):
    """Delete a marketing plan and its promo codes."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    marketing_id = params_kw.get('id')
    resellerid = await env.get_userorgid()
    
    if not marketing_id:
        return {'status': 'error', 'message': 'Missing id'}
    
    async with DBPools().sqlorContext(dbname) as sor:
        recs = await sor.R('discount_marketing', {'id': marketing_id, 'resellerid': resellerid})
        if not recs:
            return {'status': 'error', 'message': 'Marketing not found or no access'}
        
        # Delete promo codes first
        promo_codes = await sor.R('discount_promo_code', {'marketing_id': marketing_id})
        for pc in (promo_codes or []):
            await sor.D('discount_promo_code', {'id': pc.id})
        
        await sor.D('discount_marketing', {'id': marketing_id})
        return {'status': 'success'}


async def get_marketing(request, params_kw):
    """Get marketing plan detail with its discount details."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    marketing_id = params_kw.get('id')
    resellerid = await env.get_userorgid()
    
    if not marketing_id:
        return {'status': 'error', 'message': 'Missing id'}
    
    async with DBPools().sqlorContext(dbname) as sor:
        recs = await sor.R('discount_marketing', {'id': marketing_id, 'resellerid': resellerid})
        if not recs:
            return {'status': 'error', 'message': 'Marketing not found'}
        
        marketing = recs[0]
        # Get associated discount record
        discount_recs = await sor.sqlExe(
            "SELECT * FROM discount WHERE name = ${name}$ AND resellerid = ${resellerid}$ AND customerid IS NULL",
            {'name': f'营销方案-{marketing.name}', 'resellerid': resellerid}
        )
        
        discount_details = []
        if discount_recs:
            discount_id = discount_recs[0].id
            discount_details = await sor.R('discount_detail', {'discountid': discount_id, 'resellerid': resellerid})
        
        return {
            'status': 'success',
            'data': {
                'marketing': marketing,
                'discount_details': discount_details or []
            }
        }


async def list_marketings(request, params_kw):
    """List all marketing plans for current reseller."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    resellerid = await env.get_userorgid()
    
    async with DBPools().sqlorContext(dbname) as sor:
        recs = await sor.R('discount_marketing', {'resellerid': resellerid, 'sort': 'created_at desc'})
        return {'status': 'success', 'data': recs or [], 'total': len(recs or [])}


async def generate_promo_code(request, params_kw):
    """Generate a promo code (sale role).
    marketing_id can be empty (pure invitation code)."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    resellerid = await env.get_userorgid()
    sale_id = await env.get_user()
    marketing_id = params_kw.get('marketing_id')  # can be empty
    
    async with DBPools().sqlorContext(dbname) as sor:
        # If marketing_id provided, verify it exists and belongs to this reseller
        if marketing_id:
            mkt = await sor.R('discount_marketing', {'id': marketing_id, 'resellerid': resellerid})
            if not mkt:
                return {'status': 'error', 'message': 'Marketing not found or no access'}
            code_type = '1'  # promo code
        else:
            code_type = '2'  # invitation code
        
        code_id = getID()
        await sor.C('discount_promo_code', {
            'id': code_id,  # id IS the promo code
            'marketing_id': marketing_id if marketing_id else None,
            'resellerid': resellerid,
            'sale_id': sale_id,
            'code_type': code_type,
            'status': '1',
        })
        
        return {'status': 'success', 'code': code_id}


async def disable_promo_code(request, params_kw):
    """Disable a promo code."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    code_id = params_kw.get('id')
    resellerid = await env.get_userorgid()
    
    if not code_id:
        return {'status': 'error', 'message': 'Missing id'}
    
    async with DBPools().sqlorContext(dbname) as sor:
        recs = await sor.R('discount_promo_code', {'id': code_id, 'resellerid': resellerid})
        if not recs:
            return {'status': 'error', 'message': 'Promo code not found'}
        
        await sor.U('discount_promo_code', {'id': code_id, 'status': '0'})
        return {'status': 'success'}


async def generate_promo_qr(request, params_kw):
    """Generate QR code for a promo code."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    promo_id = params_kw.get('id', '')
    
    if not promo_id:
        return {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Missing promo code id', 'type': 'error'}}
    
    from appPublic.qr import gen_qr_withlogo
    from appPublic.jsonConfig import getConfig
    from ahserver.filestorage import FileStorage
    from appPublic.uniqueID import getID as _getID
    
    async with DBPools().sqlorContext(dbname) as sor:
        recs = await sor.R('discount_promo_code', {'id': promo_id})
        if not recs:
            return {'widgettype': 'Message', 'options': {'title': 'Error', 'message': f'Promo code {promo_id} not found', 'type': 'error'}}
    
    config = getConfig()
    qr_url = env.entire_url('./promote.dspy') + f'?code={promo_id}'
    fs = FileStorage()
    p = fs._name2path(f'{_getID()}.png')
    gen_qr_withlogo(qr_url, p, logopath=config.logopath, logoloc='cc')
    webp = fs.webpath(p)
    qr_file_url = env.entire_url('/idfile') + f'?path={webp}'
    
    return {
        "widgettype": "VBox",
        "options": {"width": "100%", "height": "100%", "spacing": 10},
        "subwidgets": [
            {"widgettype": "Image", "options": {"width": "340px", "height": "340px", "url": qr_file_url}},
            {"widgettype": "HBox", "options": {"width": "100%", "cheight": 2},
             "subwidgets": [
                 {"widgettype": "Text", "options": {"otext": "促销码:", "i18n": True, "cwidth": 5}},
                 {"widgettype": "Text", "options": {"text": promo_id}}
             ]},
            {"widgettype": "HBox", "options": {"width": "100%", "cheight": 2},
             "subwidgets": [
                 {"widgettype": "Text", "options": {"otext": "链接:", "i18n": True, "cwidth": 5}},
                 {"widgettype": "Text", "options": {"text": qr_url, "css": "text-muted"}}
             ]}
        ]
    }


async def bind_customer(request, params_kw):
    """Bind customer to reseller+sale via promo code (called during registration/login).
    First-time binding only. Update discounts if new ones are lower.
    params_kw may contain 'customerid' to override current user's orgid (for registration flow)."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    config = getConfig()
    db = DBPools()
    db.databases = config.databases
    code_id = params_kw.get('promo_code_id')
    customerid = params_kw.get('customerid') or await env.get_userorgid()
    
    if not code_id:
        return {'status': 'error', 'message': 'Missing promo_code_id'}
    
    async with db.sqlorContext(dbname) as sor:
        # Check if customer already bound
        existing = await sor.R('discount_customer_bind', {'customerid': customerid})
        if existing:
            return {'status': 'error', 'message': 'Customer already bound'}
        
        # Verify promo code
        code_recs = await sor.R('discount_promo_code', {'id': code_id, 'status': '1'})
        if not code_recs:
            return {'status': 'error', 'message': 'Invalid or disabled promo code'}
        
        code_rec = code_recs[0]
        resellerid = code_rec.resellerid
        sale_id = code_rec.sale_id
        
        # Create binding
        bind_id = getID()
        await sor.C('discount_customer_bind', {
            'id': bind_id,
            'customerid': customerid,
            'resellerid': resellerid,
            'sale_id': sale_id,
            'promo_code_id': code_id,
            'bind_type': '1',
        })
        
        # If promo code has marketing, copy discount details to customer
        if code_rec.marketing_id:
            await _apply_marketing_discounts_to_customer(sor, resellerid, customerid, code_rec.marketing_id)
        
        return {'status': 'success', 'resellerid': resellerid, 'sale_id': sale_id}


async def _apply_marketing_discounts_to_customer(sor, resellerid, customerid, marketing_id):
    """Copy marketing's discount details to customer, only if new discount is lower."""
    env = ServerEnv()
    biz_date = await env.get_business_date(sor)
    
    # Find marketing's discount record
    mkt_recs = await sor.R('discount_marketing', {'id': marketing_id, 'resellerid': resellerid})
    if not mkt_recs:
        return
    
    mkt_name = mkt_recs[0].name
    mkt_discount_recs = await sor.sqlExe(
        "SELECT * FROM discount WHERE name = ${name}$ AND resellerid = ${resellerid}$ AND customerid IS NULL",
        {'name': f'营销方案-{mkt_name}', 'resellerid': resellerid}
    )
    if not mkt_discount_recs:
        return
    
    mkt_discount_id = mkt_discount_recs[0].id
    mkt_details = await sor.R('discount_detail', {'discountid': mkt_discount_id})
    
    if not mkt_details:
        return
    
    # Find or create customer's discount record
    cust_discount = await sor_get_customer_discount(sor, resellerid, customerid)
    
    # Get customer's discount id
    cust_sql = """SELECT id FROM discount
WHERE resellerid = ${resellerid}$ AND customerid = ${customerid}$
AND enabled_date <= ${biz_date}$ AND expired_date > ${biz_date}$"""
    cust_recs = await sor.sqlExe(cust_sql, {'resellerid': resellerid, 'customerid': customerid, 'biz_date': biz_date})
    
    if not cust_recs:
        # Create new discount record for customer
        new_discount_id = getID()
        await sor.C('discount', {
            'id': new_discount_id,
            'name': f'客户折扣-{customerid}',
            'resellerid': resellerid,
            'customerid': customerid,
            'enabled_date': biz_date,
            'expired_date': '2099-12-31',
        })
        cust_discount_id = new_discount_id
    else:
        cust_discount_id = cust_recs[0].id
    
    # Copy details, only if new discount is lower than existing
    for mkt_detail in mkt_details:
        # Check if customer already has this product discount
        existing_detail = await sor.sqlExe(
            """SELECT * FROM discount_detail
WHERE discountid = ${discountid}$ AND prodtypeid = ${prodtypeid}$ AND productid = ${productid}$""",
            {
                'discountid': cust_discount_id,
                'prodtypeid': mkt_detail.prodtypeid,
                'productid': mkt_detail.productid
            }
        )
        
        if existing_detail:
            # Only update if new discount is lower (better for customer)
            if mkt_detail.discount < existing_detail[0].discount:
                await sor.U('discount_detail', {'id': existing_detail[0].id, 'discount': mkt_detail.discount})
        else:
            # Add new detail
            await sor.C('discount_detail', {
                'id': getID(),
                'discountid': cust_discount_id,
                'resellerid': resellerid,
                'prodtypeid': mkt_detail.prodtypeid,
                'productid': mkt_detail.productid,
                'discount': mkt_detail.discount,
            })


async def get_customer_bind(request, params_kw):
    """Get customer's binding info."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    customerid = params_kw.get('customerid') or await env.get_userorgid()
    
    async with DBPools().sqlorContext(dbname) as sor:
        recs = await sor.R('discount_customer_bind', {'customerid': customerid})
        if not recs:
            return {'status': 'success', 'data': None}
        return {'status': 'success', 'data': recs[0]}


async def assign_customer_to_sale(request, params_kw):
    """Owner operator manually assigns unbound customer to a sale."""
    env = ServerEnv()
    dbname = env.get_module_dbname('discount')
    customerid = params_kw.get('customerid')
    sale_id = params_kw.get('sale_id')
    
    if not customerid or not sale_id:
        return {'status': 'error', 'message': 'Missing customerid or sale_id'}
    
    # Verify caller is owner org (orgid='0')
    caller_orgid = await env.get_userorgid()
    if caller_orgid != '0':
        return {'status': 'error', 'message': 'Only owner can assign customers'}
    
    async with DBPools().sqlorContext(dbname) as sor:
        # Check if already bound
        existing = await sor.R('discount_customer_bind', {'customerid': customerid})
        if existing:
            return {'status': 'error', 'message': 'Customer already bound'}
        
        bind_id = getID()
        await sor.C('discount_customer_bind', {
            'id': bind_id,
            'customerid': customerid,
            'resellerid': '0',  # owner org
            'sale_id': sale_id,
            'promo_code_id': None,
            'bind_type': '2',  # manual assignment
        })
        
        return {'status': 'success', 'id': bind_id}


async def sor_before_insert_discount_promo_code(env, sor, ns):
    """CRUD hook: auto-set sale_id from logged-in user on insert."""
    from appPublic.uniqueID import getID as _getID
    ns['id'] = ns.get('id') or _getID()
    ns['sale_id'] = ns.get('sale_id') or await env.get_userid()
    ns['resellerid'] = ns.get('resellerid') or await env.get_userorgid()


def load_discount():
    env = ServerEnv()
    # before_insert hooks
    env.sor_before_insert_discount_promo_code = sor_before_insert_discount_promo_code
    # existing registrations...
    env.get_customer_discount = get_customer_discount
    env.sor_get_customer_discount = sor_get_customer_discount
    env.get_product_discount = get_product_discount
    env.sor_get_product_discount = sor_get_product_discount
    env.discount_qrcode = discount_qrcode
    env.set_promote_discount = set_promote_discount
    env.get_discount_details = get_discount_details
    env.add_discount_detail = add_discount_detail
    env.update_discount_detail = update_discount_detail
    env.delete_discount_detail = delete_discount_detail
    # Marketing & Promo Code
    env.create_marketing = create_marketing
    env.update_marketing = update_marketing
    env.delete_marketing = delete_marketing
    env.get_marketing = get_marketing
    env.list_marketings = list_marketings
    env.generate_promo_code = generate_promo_code
    env.disable_promo_code = disable_promo_code
    env.generate_promo_qr = generate_promo_qr
    env.bind_customer = bind_customer
    env.get_customer_bind = get_customer_bind
    env.assign_customer_to_sale = assign_customer_to_sale
    # Discount setting products list
    env.get_discount_setting_products = get_discount_setting_products
    env.get_discount_info = get_discount_info
    # Marketing plan discount setting
    env.get_marketing_discount_products = get_marketing_discount_products
    env.get_marketing_info = get_marketing_info


async def get_discount_setting_products(request):
    """Get products with their discount details for discount_setting page.
    Used in Jinja2 template: {% set products = get_discount_setting_products(request) %}
    """
    env = request._run_ns
    discountid = (request._run_ns.params_kw or {}).get('discountid', '')
    user_orgid = await env.get_userorgid()

    if not discountid or not user_orgid:
        return []

    dbname = env.get_module_dbname('discount')
    db = DBPools()
    config = getConfig()
    db.databases = config.databases

    # 查询基准折扣方案ID (customerid='*', 全部用户适用)
    base_sql = "SELECT id FROM discount WHERE customerid='*' AND resellerid=${org_id}$ LIMIT 1"
    base_ns = {'org_id': user_orgid}
    
    sql = """
    SELECT 
        p.id as productid,
        p.product_code,
        p.product_name,
        p.category_id,
        pc.name as category_name,
        dd.id as detail_id,
        COALESCE(dd.discount, base_dd.discount) as discount,
        dd.discountid,
        CASE WHEN dd.id IS NOT NULL THEN 1 ELSE 0 END as in_plan
    FROM product p
    LEFT JOIN product_category pc ON p.category_id = pc.id
    LEFT JOIN discount_detail dd ON dd.productid = p.id 
        AND dd.discountid = ${discountid}$
    LEFT JOIN discount_detail base_dd ON base_dd.productid = p.id
        AND base_dd.discountid = ${base_discountid}$
    WHERE p.org_id = ${org_id}$ AND p.status = '1'
    """
    ns = {'discountid': discountid, 'org_id': user_orgid}

    async with db.sqlorContext(dbname) as sor:
        # 查询基准折扣方案ID, 若不存在则降级(没有基准折扣)
        base_recs = await sor.sqlExe(base_sql, base_ns)
        base_discountid = base_recs[0].id if base_recs else None
        if base_discountid:
            ns['base_discountid'] = base_discountid
        else:
            # 无基准方案时, 用discountid自身代替, 保证COALESCE正常(只会取dd.discount, base_dd为NULL)
            ns['base_discountid'] = discountid
        
        recs = await sor.sqlExe(sql, ns)
        # 为每个产品附加 in_plan 标记
        return recs if recs else []


async def get_discount_info(request):
    """Get discount name and customer name for display header."""
    env = request._run_ns
    discountid = (request._run_ns.params_kw or {}).get('discountid', '')
    if not discountid:
        return {}
    dbname = env.get_module_dbname('discount')
    db = DBPools()
    config = getConfig()
    db.databases = config.databases
    sql = """
    SELECT dm.name, o.orgname
    FROM discount_marketing dm
    LEFT JOIN organization o ON dm.resellerid = o.id
    WHERE dm.id = ${discountid}$
    """
    async with db.sqlorContext(dbname) as sor:
        recs = await sor.sqlExe(sql, {'discountid': discountid})
        if recs:
            return {'name': recs[0].name or '', 'customer': recs[0].orgname or ''}
        return {}


async def get_marketing_discount_products(request):
    """Get products with base (all-user) discount and marketing-specific discount.
    Used in Jinja2 template: {% set products = get_marketing_discount_products(request) %}
    """
    env = request._run_ns
    discountid = (request._run_ns.params_kw or {}).get('discountid', '')
    user_orgid = await env.get_userorgid()
    if not discountid or not user_orgid:
        return []
    dbname = env.get_module_dbname('discount')
    db = DBPools()
    config = getConfig()
    db.databases = config.databases
    sql = """
    SELECT 
        p.id as productid,
        p.product_code,
        p.product_name,
        p.category_id,
        pc.name as category_name,
        base.discount as base_discount,
        mkt.id as detail_id,
        mkt.discount as marketing_discount,
        CASE WHEN mkt.id IS NOT NULL THEN '1' ELSE '0' END as in_marketing
    FROM product p
    LEFT JOIN product_category pc ON p.category_id = pc.id
    LEFT JOIN (
        SELECT dd.productid, dd.discount
        FROM discount_detail dd
        JOIN discount d ON dd.discountid = d.id
        WHERE d.resellerid = ${org_id}$ AND (d.customerid IS NULL OR d.customerid = '*')
    ) base ON base.productid = p.id
    LEFT JOIN discount_detail mkt ON mkt.productid = p.id AND mkt.discountid = ${discountid}$
    WHERE p.org_id = ${org_id}$ AND p.status = '1'
    ORDER BY pc.name, p.product_name
    """
    ns = {'discountid': discountid, 'org_id': user_orgid}
    async with db.sqlorContext(dbname) as sor:
        recs = await sor.sqlExe(sql, ns)
        return recs if recs else []


async def get_marketing_info(request):
    """Get marketing plan name for display header."""
    env = request._run_ns
    discountid = (request._run_ns.params_kw or {}).get('discountid', '')
    if not discountid:
        return {}
    dbname = env.get_module_dbname('discount')
    db = DBPools()
    config = getConfig()
    db.databases = config.databases
    sql = "SELECT name FROM discount_marketing WHERE id = ${discountid}$"
    async with db.sqlorContext(dbname) as sor:
        recs = await sor.sqlExe(sql, {'discountid': discountid})
        if recs:
            return {'name': recs[0].name or ''}
        return {}