"""Local, editable order test data. This repository can later be replaced by MCP."""

import json
import re
import sqlite3
from datetime import datetime

from .config import get_setting
from .order_tracking import build_tracking
from .visitor_service import customer_tenant_id


FIELDS = ('source_order_id', 'tenant_id', 'order_no', 'inbound_code', 'shipment_id',
          'status', 'country_code', 'transport_mode', 'warehouse_code', 'order_role',
          'parent_order_no', 'package_count', 'gross_weight_kg', 'volume_cbm',
          'history_json', 'tracking_json', 'data_note', 'source_updated_at', 'snapshot_at')
STATUS_LABELS = {'DRAFT': '草稿', 'SUBMITTED': '已提交', 'APPROVED': '审核通过',
                 'ACCEPTED': '已接单', 'REJECTED': '审核驳回', 'PROCESSING': '履约中',
                 'COMPLETED': '头程订单已完成', 'CANCELLED': '已取消'}
FIELD_LABELS = {'inbound':'入仓码', 'shipment':'Shipment ID', 'country':'目的国',
                'warehouse':'目的仓', 'transport':'运输方式', 'packages':'件数',
                'weight':'申报毛重', 'volume':'申报体积', 'role':'订单层级',
                'parent':'父订单号', 'updated':'来源更新时间'}
IDENTIFIER = re.compile(r'(?<![A-Za-z0-9_-])[A-Za-z0-9][A-Za-z0-9_-]{5,63}(?![A-Za-z0-9_-])')
ORDER_DETAIL = r'状态|进度|轨迹|到哪|开船|到港|清关|提柜|还柜|签收|预计|什么时候|何时|多久|重量|毛重|体积|件数|箱数|目的地|目的国|目的仓|仓库|父订单|运费|费用|价格|几件|几箱|公斤|千克|多少钱'
ORDER_LOGIN_TEXT = '订单查询将在客户账号登录并关联后开放。您可以先咨询运费、时效，或联系人工客服。'


class OrderDataUnavailable(Exception):
    pass


def init_order_table(connection):
    connection.execute('''CREATE TABLE IF NOT EXISTS order_test_data (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        source_order_id TEXT, tenant_id TEXT NOT NULL DEFAULT 'test',
        order_no TEXT NOT NULL COLLATE NOCASE,
        inbound_code TEXT COLLATE NOCASE, shipment_id TEXT COLLATE NOCASE,
        status TEXT NOT NULL, country_code TEXT, transport_mode TEXT, warehouse_code TEXT,
        order_role TEXT, parent_order_no TEXT,
        package_count INTEGER, gross_weight_kg TEXT, volume_cbm TEXT,
        history_json TEXT NOT NULL DEFAULT '[]', tracking_json TEXT NOT NULL DEFAULT '[]', data_note TEXT,
        source_updated_at TEXT, snapshot_at TEXT,
        UNIQUE(tenant_id, order_no)
    )''')
    columns = {row[1] for row in connection.execute('PRAGMA table_info(order_test_data)')}
    if 'tracking_json' not in columns:
        connection.execute("ALTER TABLE order_test_data ADD COLUMN tracking_json TEXT NOT NULL DEFAULT '[]'")
    connection.execute('CREATE INDEX IF NOT EXISTS idx_order_test_inbound ON order_test_data(inbound_code)')
    connection.execute('CREATE INDEX IF NOT EXISTS idx_order_test_shipment ON order_test_data(shipment_id)')


def import_records(connection, records, replace=False):
    """Import an explicitly supplied snapshot; preserve manual edits unless requested."""
    init_order_table(connection)
    inserted = skipped = 0
    for source in records:
        if not isinstance(source, dict) or not str(source.get('order_no') or '').strip():
            raise ValueError('Each record requires an order_no')
        row = {key: source.get(key) for key in FIELDS}
        row['tenant_id'] = str(row['tenant_id'] or 'test')
        row['source_order_id'] = str(row['source_order_id']) if row['source_order_id'] is not None else None
        row['order_no'] = str(row['order_no']).strip()
        row['status'] = str(row['status'] or 'DRAFT')
        history = row['history_json'] or []
        if isinstance(history, str): history = json.loads(history)
        if not isinstance(history, list): raise ValueError('history_json must contain a list')
        row['history_json'] = json.dumps(history, ensure_ascii=False)
        tracking = row['tracking_json'] or []
        if isinstance(tracking, str): tracking = json.loads(tracking)
        if not isinstance(tracking, list): raise ValueError('tracking_json must contain a list')
        row['tracking_json'] = json.dumps(tracking, ensure_ascii=False)
        row['snapshot_at'] = row['snapshot_at'] or datetime.now().isoformat(timespec='seconds')
        exists = connection.execute('SELECT 1 FROM order_test_data WHERE tenant_id=? AND order_no=?',
                                    (row['tenant_id'], row['order_no'])).fetchone()
        if exists and not replace:
            skipped += 1
            continue
        columns = ','.join(FIELDS)
        placeholders = ','.join('?' for _ in FIELDS)
        updates = ','.join(key+'=excluded.'+key for key in FIELDS if key not in ('tenant_id', 'order_no'))
        connection.execute(f'INSERT INTO order_test_data ({columns}) VALUES ({placeholders}) '
            f'ON CONFLICT(tenant_id,order_no) DO UPDATE SET {updates}', [row[key] for key in FIELDS])
        inserted += 1
    return {'imported': inserted, 'preserved': skipped}


def import_tracking_records(connection, records, replace=False):
    """Update tracking alone; never replace hand-edited order fields or add unknown orders."""
    init_order_table(connection)
    imported = preserved = missing = 0
    for record in records:
        if not isinstance(record, dict) or not record.get('tenant_id') or not record.get('order_no'):
            raise ValueError('Tracking record requires tenant_id and order_no')
        tracking = record.get('tracking_json')
        if isinstance(tracking, str): tracking = json.loads(tracking)
        if not isinstance(tracking, list): raise ValueError('tracking_json must contain a list')
        row = connection.execute('SELECT id,source_order_id,tracking_json FROM order_test_data '
                                 'WHERE tenant_id=? AND order_no=?',
                                 (str(record['tenant_id']), record['order_no'])).fetchone()
        if not row:
            missing += 1
            continue
        if not record.get('source_order_id') or str(record['source_order_id']) != str(row[1]):
            raise ValueError('Tracking source_order_id does not match local order')
        if not replace and row[2] not in (None, '', '[]'):
            preserved += 1
            continue
        connection.execute('UPDATE order_test_data SET tracking_json=? WHERE id=?',
                           (json.dumps(tracking, ensure_ascii=False), row[0]))
        imported += 1
    return {'imported': imported, 'preserved': preserved, 'missing': missing}


def lookup_order(reference, tenant_id=None):
    """Exact, bounded lookup; scope comes from server configuration, never model SQL."""
    from .db import connect

    connection = connect()
    connection.row_factory = sqlite3.Row
    try:
        query = 'SELECT * FROM order_test_data WHERE (order_no=? OR inbound_code=? OR shipment_id=?)'
        values = [reference] * 3
        tenant = get_setting('ORDER_DATA_TENANT_ID')
        if tenant_id is not None:
            if not str(tenant_id).strip():
                return []
            if tenant and str(tenant_id) != str(tenant):
                return []
            tenant = str(tenant_id)
        if tenant:
            query += ' AND tenant_id=?'
            values.append(str(tenant))
        return [dict(row) for row in connection.execute(query+' ORDER BY id LIMIT 2', values)]
    except sqlite3.Error:
        raise OrderDataUnavailable from None
    finally:
        connection.close()


def extract_reference(message):
    message = re.sub(r'\[(?:图片|文件)\]/uploads/\S+|https?://\S+', '', message)
    message = re.sub(r'(?<![A-Za-z0-9_-])\d{4}-\d{1,2}-\d{1,2}'
                     r'(?:[T ]\d{1,2}:\d{2}(?::\d{2}(?:\.\d+)?)?(?:Z|[+-]\d{2}:?\d{2})?)?'
                     r'(?![A-Za-z0-9_-])', ' ', message)
    message = re.sub(r'(?<![A-Za-z0-9_.-])\d+(?:\.\d+)?\s*[*xX×]\s*\d+(?:\.\d+)?\s*[*xX×]\s*\d+(?:\.\d+)?'
                     r'(?:\s*(?:cm|mm|m|厘米|毫米|米))?(?![A-Za-z0-9_.-])', ' ', message, flags=re.I)
    message = re.sub(r'(?<![A-Za-z0-9_-])\d+(?:\.\d+)?\s*'
                     r'(?:kg|lbs?|cbm|cm|mm|公斤|千克|克|吨|立方米|方|m[³3]|箱|件)'
                     r'(?![A-Za-z0-9_])', ' ', message, flags=re.I)
    references = []
    for token in IDENTIFIER.findall(message):
        if sum(character.isdigit() for character in token) < 3:
            continue
        if re.fullmatch(r'\d{4}[-_]\d{2}[-_]\d{2}|\d+(?:KG|LBS?|CBM|CM|MM)', token, re.I):
            continue
        if token.casefold() not in [value.casefold() for value in references]:
            references.append(token)
    return references


def build_card(row):
    fields = []
    def field(key, value):
        if value is not None and str(value).strip(): fields.append({'key': key, 'value': str(value)})
    field('inbound', row['inbound_code'])
    field('shipment', row['shipment_id'])
    field('country', row['country_code'])
    field('warehouse', row['warehouse_code'])
    field('transport', {'SEA':'海运', 'AIR':'空运', 'RAIL':'铁路', 'TRUCK':'卡航'}.get(row['transport_mode'], row['transport_mode']))
    field('packages', row['package_count'])
    field('weight', str(row['gross_weight_kg'])+' kg' if row['gross_weight_kg'] is not None else None)
    field('volume', str(row['volume_cbm'])+' m³' if row['volume_cbm'] is not None else None)
    field('role', {'CHILD':'子订单', 'MASTER':'主订单'}.get(row['order_role']))
    field('parent', row['parent_order_no'])
    field('updated', row['source_updated_at'])
    try:
        history = json.loads(row['history_json'])
    except (ValueError, TypeError):
        history = []
    nodes = [{'time': str(event.get('time') or ''),
              'text': STATUS_LABELS.get(str(event.get('status')), str(event.get('status') or '状态更新')), 'place': ''}
             for event in history[-50:] if isinstance(event, dict)] if isinstance(history, list) else []
    nodes.reverse()
    status = STATUS_LABELS.get(row['status'], row['status'])
    summary = f"订单号 {row['order_no']}，业务状态：{status}。"
    summary += '；'.join(FIELD_LABELS[item['key']]+'：'+item['value'] for item in fields)
    card = {'kind':'order', 'no':row['order_no'], 'status':status, 'fields':fields,
            'nodes':nodes, 'summary':summary}
    tracking = build_tracking(row.get('tracking_json'))
    if tracking:
        card.update(node_kind='logistics', nodes=tracking['nodes'],
                    estimated_nodes=tracking['estimated_nodes'], tracking_status=tracking['status'])
        facts = tracking['nodes'][:10] + tracking['estimated_nodes'][:5]
        card['summary'] += '。物流状态：' + (tracking['status'] or '暂无实际节点') + '。'
        card['summary'] += '；'.join(f"{node['time']} {node['text']} {node['place']}" for node in facts)
    return card


def is_order_followup(message):
    """Reuse an order only for an explicit reference or a short detail question."""
    if not re.search(ORDER_DETAIL, message):
        return False
    if re.search(r'(?:这|那|该)(?:个|票|单|笔)|该订单|刚才|上一(?:票|单|个订单)', message):
        return True
    question = re.sub(r'[\s，,。.!！?？、：:]', '', message)
    details = (
        r'(?:(?:(?:物流|运输)?(?:状态|进度|轨迹)|重量|毛重|体积|件数|箱数|目的地|目的国|目的仓|仓库|父订单|运费|费用|价格)'
        r'(?:(?:是|有|为)?(?:多少|什么|怎么样|怎样|如何|哪个))?|(?:有)?(?:几件|几箱|多少公斤|多少千克|多少钱))'
        r'(?:呢|吗|呀|啊)?')
    tracking = (
        r'(?:(?:到哪(?:里)?|开船|到港|清关|提柜|还柜|签收)(?:了)?(?:呢|吗|没|了吗|没有)?|'
        r'(?:预计)?(?:什么时候|何时|多久)(?:能|会|可以)?(?:到|到达|到港|到仓|到货|送到)(?:呢|呀|啊)?|还要多久)')
    return bool(re.fullmatch(
        r'(?:那|那么|还有|请问|请|查一下|看一下|现在|目前)?(?:它的|订单的)?'
        r'(?:'+details+'|'+tracking+')', question))


def answer_query(message, conv_id):
    references = extract_reference(message)
    tenant = customer_tenant_id()
    if references and tenant is None:
        return {'t': ORDER_LOGIN_TEXT}
    if len(references) > 1:
        return {'t':'请一次提供一个订单号、入仓码或 Shipment ID，避免查错订单。'}
    reference = references[0] if references else None
    if not reference and conv_id and is_order_followup(message):
        from .db import connect
        connection = connect()
        try:
            recent = connection.execute('SELECT role,content FROM messages WHERE conv_id=? ORDER BY id DESC LIMIT 12', (conv_id,)).fetchall()
        finally:
            connection.close()
        for role, content in recent:
            if role == 'user':
                earlier_references = extract_reference(content)
                if earlier_references:
                    reference = earlier_references[0] if len(earlier_references) == 1 else None
                    break
                if not is_order_followup(content):
                    break
            if role == 'assistant' and content.startswith('__CARD__'):
                try:
                    previous = json.loads(content[8:])
                    if previous.get('kind') == 'order':
                        reference = previous['no']
                        break
                except (ValueError, KeyError, TypeError):
                    pass
    if not reference:
        if re.search(r'查.*(?:订单|运单|物流轨迹)|订单状态|物流轨迹|shipment\s*id|(?:列出|搜索|所有|全部|多少).*(?:订单|入仓)|订单.*(?:多少|列表)', message, re.I):
            return {'t':ORDER_LOGIN_TEXT if tenant is None else '请提供订单号、入仓码或 Shipment ID。'}
        return None
    if tenant is None:
        return {'t': ORDER_LOGIN_TEXT}
    try:
        matches = lookup_order(reference, tenant_id=tenant)
    except OrderDataUnavailable:
        return {'t':'订单信息暂时无法读取，请稍后重试。'}
    if not matches:
        return {'t':f'未找到“{reference}”对应的订单。请核对订单号、入仓码或 Shipment ID，或联系人工客服。'}
    if len(matches) > 1:
        return {'t':'该标识匹配到多个订单，请提供该订单唯一的订单号或入仓码。'}
    if re.search(r'运费|费用|多少钱|价格', message):
        return {'t':'该订单未记录实际运费，请联系人工客服核实。'}
    return {'card': build_card(matches[0])}