import datetime
from pytz import timezone
from telethon.tl.functions.users import GetFullUserRequest
from pagermaid.utils import alias_command
from pagermaid.listener import listener


@listener(is_plugin=True, outgoing=True, command=alias_command("groupindex"),
          description="获取群组当日活跃数据")
async def group_index(context):
    if not context.is_group:
        await context.edit('请在群组中运行。')
        return
    # 获取群组信息
    try:
        title = context.chat.title
    except AttributeError:
        await context.edit('读取群组信息失败。')
        return
    end_id = context.id
    text = f'以下是群组 {title} 今日的活跃数据：\n'

    await context.edit('正在分析群组数据中...(1/3)')

    # 格式化日期
    now = datetime.date.today()
    yesterday = now - datetime.timedelta(days=1)
    search = datetime.datetime(yesterday.year, yesterday.month, yesterday.day, 16, 0, 0)

    # 初始化变量
    all_members = []
    member_count = {}
    start_id = None
    utc_tz = timezone('UTC')
    cst_tz = timezone('Asia/Shanghai')
    join_count = 0
    leave_count = 0
    # 读取管理员操作日志
    admin = True
    try:
        async for i in context.client.iter_admin_log(context.chat_id, join=True):
            utc_time = i.date.replace(tzinfo=utc_tz)
            cst_time = utc_time.astimezone(cst_tz)
            date = datetime.date(cst_time.year, cst_time.month, cst_time.day)
            if not date == now:
                break
            join_count += 1
        async for i in context.client.iter_admin_log(context.chat_id, leave=True):
            utc_time = i.date.replace(tzinfo=utc_tz)
            cst_time = utc_time.astimezone(cst_tz)
            date = datetime.date(cst_time.year, cst_time.month, cst_time.day)
            if not date == now:
                break
            leave_count += 1
    except:
        admin = False
    await context.edit('正在分析群组数据中...(2/3)')
    async for i in context.client.iter_messages(context.chat_id, offset_date=search, reverse=True):
        uid = i.sender_id
        if not start_id:
            start_id = i.id
        if uid:
            if uid > 0:
                if uid not in all_members:
                    all_members.append(uid)
                try:
                    count = member_count[uid]
                except KeyError:
                    count = 0
                count += 1
                member_count[uid] = count

    msg_counts = end_id - start_id
    member_counts = len(all_members)
    text += f'活跃人数：{member_counts} 人\n' \
            f'总消息数：{msg_counts} 条\n'
    if admin:
        text += f'加群 {join_count} 人，退群 {leave_count} 人\n'
    text += f'最活跃的小可爱们：\n'
    # 字典倒序排序
    member_count = sorted(member_count.items(), key=lambda x: x[1], reverse=True)
    # 遍历列表
    if len(member_count) == 0:
        text += "没有发言用户呢 ~"
    else:
        for i in range(min(len(member_count), 5)):
            # 获取用户信息
            target_user = await context.client(GetFullUserRequest(member_count[i][0]))
            first_name = target_user.user.first_name
            if first_name:
                first_name = first_name.replace("\u2060", "")
            text += f'{first_name} `{member_count[i][1]}`\n'
    await context.edit(text)