"""海报业务逻辑服务。"""
import asyncio
import json
import os
import re
import uuid
import logging
from flask import current_app
from insurance.db.compat import db
from insurance.models.ppt_config import PptProduct, PptCompany
from insurance.models.poster_case_upload import PosterCaseUpload
from insurance.models.poster_template_model import PosterTemplate
from insurance.models.poster_copy_template import PosterCopyTemplate
from insurance.models.poster_record import PosterRecord

logger = logging.getLogger(__name__)


def _safe_user_id(user_id: str) -> str:
    """清理 user_id 中的路径分隔符，防止路径穿越。"""
    return re.sub(r'[/\\.]', '_', user_id)


def _run_async(coro):
    """安全执行异步函数，处理事件循环已存在的情况。"""
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        loop = None
    if loop and loop.is_running():
        # 已有运行中的事件循环，用线程池执行
        import concurrent.futures
        with concurrent.futures.ThreadPoolExecutor() as pool:
            return pool.submit(asyncio.run, coro).result()
    return asyncio.run(coro)


class PosterService:
    """海报业务逻辑。"""

    def get_reviewed_products(self) -> dict:
        """获取已 reviewed 的产品列表（供选择）。"""
        products = PptProduct.query.filter(
            PptProduct.manual_parse_status == "reviewed",
            PptProduct.status == 1,
        ).all()
        # 按公司分组
        company_map = {}
        for p in PptProduct.query.filter(PptProduct.status == 1).all():
            company_map[p.id] = p.company_id

        result = []
        for p in products:
            result.append({
                **p.to_dict(),
                "companyName": self._get_company_name(p.company_id),
            })
        return {"code": 0, "data": result}

    def _get_company_name(self, company_id: str) -> str:
        company = PptCompany.query.get(company_id)
        return company.display_name if company else company_id

    def upload_case(self, user_id: str, product_id: str, file) -> dict:
        """上传计划书 PDF + 排队解析（异步）。"""
        product = PptProduct.query.get(product_id)
        if not product:
            return {"code": 1002, "message": "产品不存在", "data": None}

        # 文件安全校验（SEC-P1-01）
        from insurance.utils.security import validate_pdf_upload
        is_valid, err_msg = validate_pdf_upload(file)
        if not is_valid:
            return {"code": 4002, "message": err_msg, "data": None}

        # 保存文件（使用持久化存储）
        safe_uid = _safe_user_id(user_id)
        from insurance.config import get_storage_root
        upload_dir = os.path.join(get_storage_root(), "uploads", "poster-cases")
        os.makedirs(upload_dir, exist_ok=True)
        filename = f"{safe_uid}_{uuid.uuid4().hex[:8]}.pdf"
        filepath = os.path.join(upload_dir, filename)
        file.save(filepath)

        # 创建记录
        record = PosterCaseUpload(
            user_id=user_id,
            product_id=product_id,
            source_file_url=filepath,
            parse_status="pending",
        )
        db.session.add(record)
        db.session.commit()

        # 启动后台解析任务
        from insurance.poster.tasks import start_case_parse_task
        if start_case_parse_task(current_app._get_current_object(), record.id):
            record.parse_status = "queued"
            db.session.commit()
        else:
            record.parse_status = "failed"
            db.session.commit()
            return {"code": 5001, "message": "任务排队失败，请重试", "data": None}

        return {"code": 0, "data": record.to_dict()}

    def get_case_upload(self, record_id: int, user_id: str) -> dict:
        """获取解析结果。"""
        record = PosterCaseUpload.query.get(record_id)
        if not record or record.user_id != user_id:
            return {"code": 1002, "message": "记录不存在", "data": None}
        return {"code": 0, "data": record.to_dict()}

    def confirm_case_upload(self, record_id: int, user_id: str, data: dict) -> dict:
        """人工核对/修正解析数据。"""
        record = PosterCaseUpload.query.get(record_id)
        if not record or record.user_id != user_id:
            return {"code": 1002, "message": "记录不存在", "data": None}
        record.confirmed_data = json.dumps(data.get("confirmedData", {}), ensure_ascii=False)
        record.confirmed_by = user_id
        from datetime import datetime
        record.confirmed_at = datetime.now()
        db.session.commit()
        return {"code": 0, "data": record.to_dict()}

    def get_templates(self) -> dict:
        """获取可用海报模板列表。"""
        templates = PosterTemplate.query.filter_by(status=1).all()
        return {"code": 0, "data": [t.to_dict() for t in templates]}

    def get_copy_templates(self) -> dict:
        """获取可用文案模板列表。"""
        templates = PosterCopyTemplate.query.filter_by(status=1).all()
        return {"code": 0, "data": [t.to_dict() for t in templates]}

    def generate_copy(self, user_id: str, data: dict) -> dict:
        """生成文案（template/ai 模式）。"""
        mode = data.get("mode", "template")
        case_upload_id = data.get("caseUploadId")
        product_id = data.get("productId")
        use_masked_data = bool(data.get("useMaskedData"))

        # 获取产品规则
        product_rules = {}
        if product_id:
            product = PptProduct.query.get(product_id)
            if product and product.manual_parsed_rules:
                product_rules = json.loads(product.manual_parsed_rules)

        # 脱敏处理：替换产品规则中的产品名和保司名
        if use_masked_data and product_rules:
            from insurance.ppt.masking import (
                apply_product_mask, apply_company_mask,
                fallback_mask_name, mask_text, build_name_replacements,
            )
            if product:
                product_dict = product.to_dict()
                apply_product_mask(product_dict, True)
                product_rules["product_name"] = product_dict.get("displayName", product_rules.get("product_name", ""))
                # 替换规则中的产品名引用
                masked_name = product_rules["product_name"]
                real_name = product.display_name
                if real_name and masked_name and real_name != masked_name:
                    for key in product_rules:
                        if isinstance(product_rules[key], str):
                            product_rules[key] = product_rules[key].replace(real_name, masked_name)
                # 也替换保司名
                company = PptCompany.query.get(product.company_id)
                if company:
                    company_dict = company.to_dict()
                    apply_company_mask(company_dict, True)
                    masked_company = company_dict.get("displayName", "")
                    real_company = company.display_name
                    if real_company and masked_company and real_company != masked_company:
                        for key in product_rules:
                            if isinstance(product_rules[key], str):
                                product_rules[key] = product_rules[key].replace(real_company, masked_company)

        # 获取客户数据（校验 case 所有权 — 防止越权读取他人客户数据）
        customer_data = {}
        if case_upload_id:
            case = PosterCaseUpload.query.get(case_upload_id)
            if not case or case.user_id != user_id:
                return {"code": 404, "message": "记录不存在", "data": None}
            if case.confirmed_data:
                customer_data = json.loads(case.confirmed_data)

        if mode == "template":
            template_id = data.get("templateId")
            template = PosterCopyTemplate.query.get(template_id)
            if not template:
                return {"code": 1002, "message": "文案模板不存在", "data": None}
            from insurance.poster.copy_generator import CopyGenerator
            generator = CopyGenerator()
            result = generator.generate_template_copy(template.content, product_rules, customer_data)
            return {"code": 0, "data": {"copy": result, "mode": "template"}}
        else:
            style = data.get("style", "专业")
            import asyncio
            from insurance.poster.copy_generator import CopyGenerator
            generator = CopyGenerator()
            result = _run_async(generator.generate_ai_copy(product_rules, customer_data, style))
            return {"code": 0, "data": {"copy": result, "mode": "ai"}}

    def generate_poster(self, user_id: str, data: dict) -> dict:
        """生成海报图片（异步 — 排队后立即返回）。"""
        case_upload_id = data.get("caseUploadId")
        template_id = data.get("templateId")
        copy_content = data.get("copyContent", {})
        size = data.get("size", "1024x1792")
        product_id = data.get("productId")
        reference_image = data.get("referenceImage")
        force_regenerate = data.get("regenerate", False)
        use_masked_data = bool(data.get("useMaskedData"))

        # 校验 case 所有权（SEC-P0-03）
        if case_upload_id:
            case = PosterCaseUpload.query.get(case_upload_id)
            if not case or case.user_id != user_id:
                return {"code": 404, "message": "记录不存在", "data": None}
            if case.confirmed_data is None:
                return {"code": 1002, "message": "请先确认解析数据", "data": None}

        # 幂等检查（TASK-P1-02）：相同参数的未完成任务直接返回
        if not force_regenerate and case_upload_id:
            existing = PosterRecord.query.filter(
                PosterRecord.user_id == user_id,
                PosterRecord.case_upload_id == case_upload_id,
                PosterRecord.template_id == template_id,
                PosterRecord.task_status.in_(["pending", "queued", "generating"]),
            ).order_by(PosterRecord.created_at.desc()).first()
            if existing:
                return {"code": 0, "data": existing.to_dict()}

        # 创建记录（任务状态为 pending）
        ai_raw_content = data.get("aiRawContent")
        record = PosterRecord(
            user_id=user_id,
            product_id=product_id,
            case_upload_id=case_upload_id,
            template_id=template_id,
            copy_mode=data.get("copyMode", "ai"),
            copy_content=json.dumps(copy_content, ensure_ascii=False) if copy_content else None,
            ai_raw_content=json.dumps(ai_raw_content, ensure_ascii=False) if ai_raw_content else None,
            export_size=size,
            reference_image_used=reference_image,
            task_status="pending",
            task_progress=0,
            extra_data=json.dumps({"useMaskedData": use_masked_data}, ensure_ascii=False),
        )
        db.session.add(record)
        db.session.commit()

        # 启动后台生成任务
        from insurance.poster.tasks import start_poster_generate_task
        if start_poster_generate_task(current_app._get_current_object(), record.id, user_id, data):
            record.task_status = "queued"
            db.session.commit()
        else:
            record.task_status = "failed"
            record.task_error = "任务排队失败"
            db.session.commit()
            return {"code": 5001, "message": "任务排队失败，请重试", "data": None}

        return {"code": 0, "data": record.to_dict()}

    def list_records(self, user_id: str, params: dict) -> dict:
        """海报生成记录列表。"""
        query = db.session.query(PosterRecord).filter(PosterRecord.user_id == user_id)
        query = query.order_by(PosterRecord.created_at.desc())
        page = max(1, params.get("page", 1))
        page_size = min(100, max(1, params.get("page_size", 20)))
        total = query.count()
        items = query.offset((page - 1) * page_size).limit(page_size).all()
        return {
            "code": 0,
            "data": {
                "total": total,
                "items": [r.to_dict() for r in items],
            },
        }

    def get_record(self, record_id: int, user_id: str) -> dict:
        """记录详情（含任务状态，用于轮询）。"""
        record = PosterRecord.query.get(record_id)
        if not record or record.user_id != user_id:
            return {"code": 1002, "message": "记录不存在", "data": None}
        return {"code": 0, "data": record.to_dict()}