from __future__ import annotations

import os
import time

import requests

from ..core import app
from . import constants


class VersionManager:
    """版本管理器
    """

    ap: app.Application

    def __init__(
        self,
        ap: app.Application
    ):
        self.ap = ap

    async def initialize(
        self
    ):
        pass
    
    def get_current_version(
        self
    ) -> str:
        current_tag = constants.semantic_version

        return current_tag
    
    async def get_release_list(self) -> list:
        """获取发行列表"""
        rls_list_resp = requests.get(
            url="https://api.github.com/repos/RockChinQ/QChatGPT/releases",
            proxies=self.ap.proxy_mgr.get_forward_proxies(),
            timeout=5
        )

        rls_list = rls_list_resp.json()

        return rls_list
    
    async def update_all(self):
        """检查更新并下载源码"""
        start_time = time.time()

        current_tag = self.get_current_version()
        old_tag = current_tag

        rls_list = await self.get_release_list()

        latest_rls = {}
        rls_notes = []
        latest_tag_name = ""
        for rls in rls_list:
            rls_notes.append(rls['name'])  # 使用发行名称作为note
            if latest_tag_name == "":
                latest_tag_name = rls['tag_name']

            if rls['tag_name'] == current_tag:
                break

            if latest_rls == {}:
                latest_rls = rls
        self.ap.logger.info("更新日志: {}".format(rls_notes))

        if latest_rls == {} and not self.is_newer(latest_tag_name, current_tag):  # 没有新版本
            return False

        # 下载最新版本的zip到temp目录
        self.ap.logger.info("开始下载最新版本: {}".format(latest_rls['zipball_url']))

        zip_url = latest_rls['zipball_url']
        zip_resp = requests.get(
            url=zip_url,
            proxies=self.ap.proxy_mgr.get_forward_proxies()
        )
        zip_data = zip_resp.content

        # 检查temp/updater目录
        if not os.path.exists("temp"):
            os.mkdir("temp")
        if not os.path.exists("temp/updater"):
            os.mkdir("temp/updater")
        with open("temp/updater/{}.zip".format(latest_rls['tag_name']), "wb") as f:
            f.write(zip_data)

        self.ap.logger.info("下载最新版本完成: {}".format("temp/updater/{}.zip".format(latest_rls['tag_name'])))

        # 解压zip到temp/updater/<tag_name>/
        import zipfile
        # 检查目标文件夹
        if os.path.exists("temp/updater/{}".format(latest_rls['tag_name'])):
            import shutil
            shutil.rmtree("temp/updater/{}".format(latest_rls['tag_name']))
        os.mkdir("temp/updater/{}".format(latest_rls['tag_name']))
        with zipfile.ZipFile("temp/updater/{}.zip".format(latest_rls['tag_name']), 'r') as zip_ref:
            zip_ref.extractall("temp/updater/{}".format(latest_rls['tag_name']))

        # 覆盖源码
        source_root = ""
        # 找到temp/updater/<tag_name>/中的第一个子目录路径
        for root, dirs, files in os.walk("temp/updater/{}".format(latest_rls['tag_name'])):
            if root != "temp/updater/{}".format(latest_rls['tag_name']):
                source_root = root
                break

        # 覆盖源码
        import shutil
        for root, dirs, files in os.walk(source_root):
            # 覆盖所有子文件子目录
            for file in files:
                src = os.path.join(root, file)
                dst = src.replace(source_root, ".")
                if os.path.exists(dst):
                    os.remove(dst)

                # 检查目标文件夹是否存在
                if not os.path.exists(os.path.dirname(dst)):
                    os.makedirs(os.path.dirname(dst))
                # 检查目标文件是否存在
                if not os.path.exists(dst):
                    # 创建目标文件
                    open(dst, "w").close()

                shutil.copy(src, dst)

        # 把current_tag写入文件
        current_tag = latest_rls['tag_name']
        with open("current_tag", "w") as f:
            f.write(current_tag)

        await self.ap.ctr_mgr.main.post_update_record(
            spent_seconds=int(time.time()-start_time),
            infer_reason="update",
            old_version=old_tag,
            new_version=current_tag,
        )

    async def is_new_version_available(self) -> bool:
        """检查是否有新版本"""
        # 从github获取release列表
        rls_list = await self.get_release_list()
        if rls_list is None:
            return False

        # 获取当前版本
        current_tag = self.get_current_version()

        # 检查是否有新版本
        latest_tag_name = ""
        for rls in rls_list:
            if latest_tag_name == "":
                latest_tag_name = rls['tag_name']
                break

        return self.is_newer(latest_tag_name, current_tag)
    

    def is_newer(self, new_tag: str, old_tag: str):
        """判断版本是否更新，忽略第四位版本和第一位版本"""
        if new_tag == old_tag:
            return False

        new_tag = new_tag.split(".")
        old_tag = old_tag.split(".")
        
        # 判断主版本是否相同
        if new_tag[0] != old_tag[0]:
            return False

        if len(new_tag) < 4:
            return True

        # 合成前三段，判断是否相同
        new_tag = ".".join(new_tag[:3])
        old_tag = ".".join(old_tag[:3])

        return new_tag != old_tag


    def compare_version_str(v0: str, v1: str) -> int:
        """比较两个版本号"""

        # 删除版本号前的v
        if v0.startswith("v"):
            v0 = v0[1:]
        if v1.startswith("v"):
            v1 = v1[1:]

        v0:list = v0.split(".")
        v1:list = v1.split(".")

        # 如果两个版本号节数不同，把短的后面用0补齐
        if len(v0) < len(v1):
            v0.extend(["0"]*(len(v1)-len(v0)))
        elif len(v0) > len(v1):
            v1.extend(["0"]*(len(v0)-len(v1)))

        # 从高位向低位比较
        for i in range(len(v0)):
            if int(v0[i]) > int(v1[i]):
                return 1
            elif int(v0[i]) < int(v1[i]):
                return -1
        
        return 0

    async def show_version_update(
        self
    ):
        try:

            if await self.ap.ver_mgr.is_new_version_available():
                self.ap.logger.info("有新版本可用，请使用 !update 命令更新")
        
        except Exception as e:
            self.ap.logger.warning(f"检查版本更新时出错: {e}")