"""
审查进度轮询接口Mock实现
模拟任务进度更新，支持多阶段进度展示
"""

import time
import random
from datetime import datetime
from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel
from typing import Optional

task_progress_router = APIRouter(prefix="/sgsc", tags=["进度轮询Mock"])

# 导入文件上传模块的存储
try:
    from .file_upload import uploaded_files
except ImportError:
    from views.construction_review.file_upload import uploaded_files

# 导入错误码定义
from .schemas.error_schemas import TaskProgressErrors

class TaskProgressResponse(BaseModel):
    code: int
    data: dict

def update_task_progress(callback_task_id: str) -> dict:
    """更新任务进度（模拟真实的处理过程）"""
    if callback_task_id not in uploaded_files:
        return None

    task_info = uploaded_files[callback_task_id]
    current_time = int(time.time())

    # 根据时间模拟进度推进
    time_elapsed = current_time - task_info.get("updated_at", current_time)

    # 定义各阶段的时间分配（总时长约30分钟）
    stage_durations = {
        "格式校验": 60,      # 1分钟
        "内容提取": 900,     # 15分钟
        "智能审查": 840      # 14分钟
    }

    total_duration = sum(stage_durations.values())

    # 计算当前应该处于哪个阶段
    accumulated_time = 0
    overall_progress = 0
    stages = []

    for stage_name, duration in stage_durations.items():
        if time_elapsed > accumulated_time + duration:
            # 阶段已完成
            stages.append({
                "stage_name": stage_name,
                "progress": 100,
                "stage_status": "completed"
            })
            accumulated_time += duration
        elif time_elapsed > accumulated_time:
            # 阶段进行中
            stage_progress = min(100, int((time_elapsed - accumulated_time) / duration * 100))
            stages.append({
                "stage_name": stage_name,
                "progress": stage_progress,
                "stage_status": "processing"
            })
            accumulated_time += duration
        else:
            # 阶段未开始
            stages.append({
                "stage_name": stage_name,
                "progress": 0,
                "stage_status": "pending"
            })

    # 计算总进度
    overall_progress = min(100, int(time_elapsed / total_duration * 100))

    # 确定任务状态
    if overall_progress >= 100:
        review_task_status = "completed"
        estimated_remaining = 0
    else:
        review_task_status = "processing"
        estimated_remaining = max(0, total_duration - time_elapsed)

    # 更新任务信息
    task_info.update({
        "review_task_status": review_task_status,
        "overall_progress": overall_progress,
        "stages": stages,
        "updated_at": current_time,
        "estimated_remaining": estimated_remaining
    })

    return task_info

@task_progress_router.get("/task_progress/{callback_task_id}", response_model=TaskProgressResponse)
async def task_progress(
    callback_task_id: str,
    user: str = Query(None)
):
    """
    Mock任务进度轮询接口
    """
    try:
        # 验证参数
        if user is None or not isinstance(user, str):
            raise TaskProgressErrors.missing_parameters()

        if not callback_task_id or not isinstance(callback_task_id, str):
            raise TaskProgressErrors.missing_parameters()

        # 检查callback_task_id格式（应该是UUID-时间戳格式）
        if len(callback_task_id) < 20 or callback_task_id.count('-') < 4:
            raise TaskProgressErrors.invalid_param_format()

        # 验证用户标识（应该是指定用户如user-001）
        valid_users = {"user-001", "user-002", "user-003"}  # 可以配置化
        if user == "" or user not in valid_users:
            raise TaskProgressErrors.invalid_user()

        # 检查任务是否存在
        if callback_task_id not in uploaded_files:
            raise TaskProgressErrors.task_not_found()

        # 验证用户权限
        task_info = uploaded_files[callback_task_id]
        if task_info.get("user") != user:
            raise TaskProgressErrors.invalid_user()

        # 更新进度
        updated_task = update_task_progress(callback_task_id)

        return TaskProgressResponse(
            code=200,
            data={
                "callback_task_id": callback_task_id,
                "user": user,
                "review_task_status": updated_task["review_task_status"],
                "overall_progress": updated_task["overall_progress"],
                "stages": updated_task["stages"],
                "updated_at": updated_task["updated_at"],
                "estimated_remaining": updated_task["estimated_remaining"]
            }
        )

    except HTTPException:
        raise
    except Exception as e:
        raise TaskProgressErrors.server_internal_error(e)

@task_progress_router.post("/mock/advance_time")
async def advance_time(seconds: int = 300):
    """Mock接口：推进时间（用于测试）"""
    for callback_task_id in list(uploaded_files.keys()):
        if "review_task_status" in uploaded_files[callback_task_id]:
            uploaded_files[callback_task_id]["updated_at"] -= seconds
    return {"message": f"时间推进了 {seconds} 秒"}