# -*- coding: utf-8 -*-
import time
from pathlib import Path
from typing import Iterator, Optional
from openai import OpenAI, APIError, APITimeoutError
from Config import *


class MarkdownGenerator:
    """Markdown教学大纲生成器（OpenAI版本）"""

    def __init__(
            self,
            course_name: str,
            output_path: Optional[Path] = None,
            template_path: Optional[Path] = None
    ):
        """
        初始化生成器

        :param course_name: 课程名称（如：小学数学内角和）
        :param output_path: 输出文件路径（可选）
        :param template_path: 模板文件路径（可选）
        """
        self.course_name = course_name
        self.template_path = template_path or DEFAULT_TEMPLATE
        self.output_path = output_path or DEFAULT_OUTPUT_DIR / f"{course_name}.md"
        self.client = OpenAI(api_key=MODEL_API_KEY, base_url=MODEL_API_URL)  # 初始化OpenAI客户端

        self._validate_paths()

    def _validate_paths(self):
        """路径验证（保持不变）"""
        if not self.template_path.exists():
            raise FileNotFoundError(f"模板文件不存在: {self.template_path}")

        self.output_path.parent.mkdir(parents=True, exist_ok=True)
        if not self.output_path.parent.is_dir():
            raise NotADirectoryError(f"无效的输出目录: {self.output_path.parent}")

    def _load_template(self) -> str:
        """加载模板内容（保持不变）"""
        return self.template_path.read_text(encoding='utf-8')

    def _generate_stream(self) -> Iterator:
        """流式生成内容（修改为OpenAI格式）"""
        system_prompt = (
            "请严格按照以下Markdown格式生成教学大纲：\n"
            f"{self._load_template()}\n"
            "注意：\n"
            "1. 使用#/##标记标题\n"
            "2. 每页内容以>开头\n"
            "3. 列表项使用-标记\n"
            "4. 内容中不要包含图片\n"
        )

        return self.client.chat.completions.create(
            model=MODEL_NAME,
            messages=[
                {"role": "system", "content": system_prompt},
                {"role": "user", "content": f"请生成《{self.course_name}》教学大纲"}
            ],
            stream=True,
            timeout=100  # 设置超时时间
        )

    def run(self) -> bool:
        """执行生成流程（调整流式处理逻辑）"""
        start_time = time.time()
        spinner = ['⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏']
        content_buffer = []

        try:
            print(f"🚀 开始生成【{self.course_name}】教学大纲")
            stream = self._generate_stream()

            for idx, chunk in enumerate(stream):
                print(f"\r{spinner[idx % 10]} 生成中（{int(time.time() - start_time)}秒）", end="")

                # 处理OpenAI流式响应
                if chunk.choices and chunk.choices[0].delta.content:
                    content_chunk = chunk.choices[0].delta.content
                    content_buffer.append(content_chunk)

                    if len(content_buffer) == 1:
                        print("\n\n📝 内容生成开始：")
                    print(content_chunk, end="", flush=True)

            # 保存结果
            if content_buffer:
                full_content = ''.join(content_buffer)
                self.output_path.write_text(full_content, encoding='utf-8')
                print(f"\n\n✅ 生成成功！耗时 {int(time.time() - start_time)}秒")
                print(f"📂 文件已保存至：{self.output_path}")
                return True
            return False

        except APITimeoutError as e:
            print(f"\n\n❌ 请求超时：{str(e)}")
            return False
        except APIError as e:
            print(f"\n\n❌ API错误：{str(e)}")
            return False
        except Exception as e:
            print(f"\n\n❌ 未处理异常：{str(e)}")
            return False


def generate_document(
        course_name: str,
        output_path: Optional[str] = None,
        template_path: Optional[str] = None
):
    """
    生成文档入口函数（保持不变）
    """
    try:
        generator = MarkdownGenerator(
            course_name=course_name,
            output_path=Path(output_path) if output_path else None,
            template_path=Path(template_path) if template_path else None
        )
        return generator.run()
    except Exception as e:
        print(f"❌ 初始化失败：{str(e)}")
        return False