"""
PregoPal - 饮食记录模块
========================
记录孕妇的饮食习惯，同时保存为 JSON（结构化）+ Markdown（可读）。

数据流向：
  MiniCPM-o 回复 (含 [DIET_RECORD] 标记)  →  正则解析  →  JSON + Markdown

当前：手动表单输入
后续：AI 对话中自动提取 [DIET_RECORD] 标记
"""

import json
import datetime
import hashlib
import re
from pathlib import Path
from config import DIET_LOG_FILE, LOGS_DIR, DIET_LOG_SCHEMA_VERSION


class DietLogger:
    """记录孕妇的饮食习惯并保存为 Markdown"""

    def __init__(self):
        self.log_file = DIET_LOG_FILE
        self.logs = self._load_logs()

    def _load_logs(self):
        """加载饮食记录"""
        if self.log_file.exists():
            with open(self.log_file, 'r', encoding='utf-8') as f:
                return json.load(f)
        return {"schema_version": DIET_LOG_SCHEMA_VERSION, "records": []}

    def _save_logs(self):
        """保存饮食记录"""
        with open(self.log_file, 'w', encoding='utf-8') as f:
            json.dump(self.logs, f, ensure_ascii=False, indent=2)

    def add_record(self, member_name: str, member_relation: str, date: str,
                   meals: dict, mood: str = "", notes: str = ""):
        """添加一条饮食记录"""
        record = {
            "id": hashlib.md5(f"{date}_{member_name}_{datetime.datetime.now()}".encode()).hexdigest()[:8],
            "member_name": member_name,
            "member_relation": member_relation,
            "date": date,
            "meals": meals,
            "mood": mood,
            "notes": notes,
            "extensions": {},  # 预留扩展字段
            "created_at": datetime.datetime.now().isoformat()
        }
        self.logs["records"].append(record)
        self._save_logs()

        # 同时生成 Markdown 文件
        md_path = self._generate_markdown(record)
        return record, md_path

    def _generate_markdown(self, record: dict) -> Path:
        """生成 Markdown 格式的饮食日志"""
        date_str = record["date"]
        md_filename = LOGS_DIR / f"饮食日志_{date_str}.md"

        content = f"""# 🥗 孕期饮食日志

## 📋 基本信息
- **日期**: {date_str}
- **记录人**: {record['member_relation']} - {record['member_name']}
- **记录时间**: {record['created_at'][:19]}

## 🍽️ 今日饮食记录

"""
        for meal_time, food in record["meals"].items():
            content += f"### {meal_time}\n- {food}\n\n"

        if record["mood"]:
            content += f"## 😊 今日心情\n{record['mood']}\n\n"

        if record["notes"]:
            content += f"## 📝 备注\n{record['notes']}\n\n"

        content += """---
*由 PregoPal 自动生成*
"""

        with open(md_filename, 'w', encoding='utf-8') as f:
            f.write(content)

        return md_filename

    def get_recent_records(self, days: int = 7) -> list:
        """获取最近几天的记录"""
        today = datetime.date.today()
        cutoff = today - datetime.timedelta(days=days)
        recent = []
        for r in self.logs["records"]:
            try:
                record_date = datetime.date.fromisoformat(r["date"])
                if record_date >= cutoff:
                    recent.append(r)
            except ValueError:
                continue
        return sorted(recent, key=lambda x: x["date"], reverse=True)

    def get_all_markdown_files(self) -> list:
        """获取所有 Markdown 日志文件"""
        return sorted(LOGS_DIR.glob("*.md"), reverse=True)

    # ============================================================
    # [DIET_RECORD] 标记解析（后续 AI 版本使用）
    # ============================================================
    @staticmethod
    def parse_diet_record(text: str) -> dict | None:
        """
        从 AI 回复中解析 [DIET_RECORD] 标记

        Args:
            text: AI 模型的回复文本

        Returns:
            解析出的饮食记录字典，或 None（未找到标记）

        示例输入：
            [DIET_RECORD]
            日期: 2026-06-07
            早餐: 全麦面包+鸡蛋+牛奶
            午餐: 清蒸鱼+糙米饭+炒时蔬
            晚餐:
            加餐: 酸奶+坚果
            心情: 挺好
            备注:
            [/DIET_RECORD]
        """
        pattern = r'\[DIET_RECORD\](.*?)\[/DIET_RECORD\]'
        match = re.search(pattern, text, re.DOTALL)
        if not match:
            return None

        content = match.group(1).strip()
        record = {"meals": {}, "mood": "", "notes": ""}

        for line in content.split('\n'):
            line = line.strip()
            if not line:
                continue

            if ':' in line:
                key, value = line.split(':', 1)
                key = key.strip()
                value = value.strip()

                if key == '日期':
                    record['date'] = value
                elif key == '心情':
                    record['mood'] = value
                elif key == '备注':
                    record['notes'] = value
                elif key in ['早餐', '午餐', '晚餐', '加餐']:
                    if value:  # 只记录非空值
                        record['meals'][key] = value

        return record if record['meals'] else None