"""Schema 文件存储与解析。"""

from __future__ import annotations

import io
import json
import os
import re
from datetime import datetime
from typing import BinaryIO

from openpyxl import load_workbook

from app.utils.llm import strip_thinking


class SchemaStorage:
    def __init__(self, file_path: str | None = None) -> None:
        self.file_path = file_path or os.path.join(os.getcwd(), "data", "schema.json")
        os.makedirs(os.path.dirname(self.file_path), exist_ok=True)
        if not os.path.exists(self.file_path):
            self._write({"processing_status": "empty", "modules": []})

    def _read(self) -> dict:
        if not os.path.exists(self.file_path):
            return {"processing_status": "empty", "modules": []}
        with open(self.file_path, "r", encoding="utf-8") as file:
            return json.load(file)

    def _write(self, data: dict) -> None:
        os.makedirs(os.path.dirname(self.file_path), exist_ok=True)
        with open(self.file_path, "w", encoding="utf-8") as file:
            json.dump(data, file, ensure_ascii=False, indent=2)

    def save(self, source_type: str, content: bytes | BinaryIO, filename: str = "", source_url: str = "") -> dict:
        raw = content.read() if hasattr(content, "read") else content
        modules = self._parse_excel(io.BytesIO(raw))
        data = {
            "version": "2.0",
            "uploaded_at": datetime.now().isoformat(),
            "source_type": source_type,
            "source_url": source_url,
            "filename": filename,
            "processing_status": "done",
            "modules": modules,
        }
        self._write(data)
        return data

    def get(self) -> dict:
        return self._clean_descriptions_for_response(self._read())

    def status(self) -> dict:
        data = self._read()
        modules = data.get("modules", [])
        return {
            "processing_status": data.get("processing_status", "empty"),
            "module_count": len(modules),
            "uploaded_at": self._format_time(data.get("uploaded_at", "")),
            "source_type": data.get("source_type", ""),
            "source_url": data.get("source_url", ""),
            "filename": data.get("filename", ""),
        }

    def delete_file(self) -> bool:
        if os.path.exists(self.file_path):
            os.remove(self.file_path)
            return True
        return False

    def _parse_excel(self, stream: BinaryIO) -> list[dict]:
        workbook = load_workbook(stream, data_only=True)
        modules: list[dict] = []
        try:
            sheet = workbook.active
            current: dict | None = None
            headers: list[str] = []
            for row in sheet.iter_rows(values_only=True):
                values = ["" if value is None else str(value).strip() for value in row]
                if not any(values):
                    continue
                if "数据名称" in values and "数据标记" in values:
                    headers = values
                    continue
                if len(values) >= 1 and values[0] and not values[0].isdigit() and all(not value for value in values[1:]):
                    current = {"module_name": values[0], "table_name": "", "description": "", "fields": []}
                    modules.append(current)
                    continue
                if not headers:
                    continue
                if current is None:
                    current = {"module_name": "默认模块", "table_name": "", "description": "", "fields": []}
                    modules.append(current)
                row_map = {headers[index]: values[index] for index in range(min(len(headers), len(values)))}
                marker = row_map.get("数据标记", "")
                field_name = row_map.get("数据名称", "")
                table_name = row_map.get("表名", "")
                if table_name and not current.get("table_name"):
                    current["table_name"] = table_name
                if marker or field_name:
                    current["fields"].append({
                        "seq": row_map.get("序号", ""),
                        "name": field_name,
                        "marker": marker,
                        "type": row_map.get("数据类型", ""),
                        "length": row_map.get("数据长度", ""),
                        "rule": row_map.get("数据填写规则", ""),
                        "required": row_map.get("数据填写要求", ""),
                        "strong_check": row_map.get("强弱校验", ""),
                    })
            for module in modules:
                module["description"] = module.get("description") or self._fallback_description(module)
            return modules
        finally:
            workbook.close()

    def _sanitize_description(self, response: str, module: dict) -> str:
        cleaned = strip_thinking(response or "").strip()
        quoted = re.findall(r'"([^"]{8,})"', cleaned)
        if quoted:
            cleaned = quoted[-1].strip()
        cleaned = re.sub(r"^(好的|我来|以下).*?[。:：]\s*", "", cleaned).strip()
        if "<think>" in cleaned or not cleaned:
            return self._fallback_description(module)
        return cleaned

    def _clean_descriptions_for_response(self, data: dict) -> dict:
        cloned = json.loads(json.dumps(data, ensure_ascii=False))
        for module in cloned.get("modules", []):
            module["description"] = self._sanitize_description(module.get("description", ""), module)
        return cloned

    def _fallback_description(self, module: dict) -> str:
        name = module.get("module_name", "数据表")
        fields = "、".join(field.get("name", "") for field in module.get("fields", [])[:6] if field.get("name"))
        return f"{name}表用于记录和管理{fields or '关键业务'}等信息，支撑查询、校验和监管规则生成。"

    def _format_time(self, value: str) -> str:
        if not value:
            return ""
        try:
            return datetime.fromisoformat(value).strftime("%Y-%m-%d %H:%M:%S")
        except ValueError:
            return value