#!/usr/bin/env python3
"""
Day 083 - 进阶用法：自动化部署流水线
完整的部署流水线：打包 → 上传 → 备份 → 部署 → 验证 → 通知
"""

import os
import time
import json
from datetime import datetime
from dataclasses import dataclass, field
from typing import List, Optional, Callable
from enum import Enum

# ============ 数据模型 ============
class DeployStatus(Enum):
    PENDING = "pending"
    RUNNING = "running"
    SUCCESS = "success"
    FAILED = "failed"
    ROLLED_BACK = "rolled_back"

@dataclass
class DeployStep:
    """部署步骤"""
    name: str
    status: DeployStatus = DeployStatus.PENDING
    start_time: Optional[datetime] = None
    end_time: Optional[datetime] = None
    error: Optional[str] = None

    def start(self):
        self.status = DeployStatus.RUNNING
        self.start_time = datetime.now()

    def success(self):
        self.status = DeployStatus.SUCCESS
        self.end_time = datetime.now()

    def fail(self, error: str):
        self.status = DeployStatus.FAILED
        self.end_time = datetime.now()
        self.error = error

@dataclass
class DeployPipeline:
    """部署流水线"""
    version: str
    steps: List[DeployStep] = field(default_factory=list)
    status: DeployStatus = DeployStatus.PENDING
    start_time: Optional[datetime] = None
    end_time: Optional[datetime] = None

    def add_step(self, name: str):
        self.steps.append(DeployStep(name))

    def start(self):
        self.status = DeployStatus.RUNNING
        self.start_time = datetime.now()
        print(f"\n{'='*60}")
        print(f"🚀 部署流水线启动 — v{self.version}")
        print(f"{'='*60}\n")

    def finish(self, success: bool):
        self.status = DeployStatus.SUCCESS if success else DeployStatus.FAILED
        self.end_time = datetime.now()
        duration = (self.end_time - self.start_time).total_seconds()

        print(f"\n{'='*60}")
        if success:
            print(f"✅ 部署成功！v{self.version} 已上线")
        else:
            print(f"❌ 部署失败")
        print(f"⏱️  总耗时: {duration:.1f}s")
        print(f"{'='*60}\n")

# ============ 部署执行器 ============
class DeploymentExecutor:
    """部署执行器"""

    def __init__(self):
        self.pipeline: Optional[DeployPipeline] = None

    def execute_step(self, step_name: str, func: Callable, *args, **kwargs):
        """执行单个部署步骤"""
        print(f"\n📋 步骤: {step_name}")
        print("-" * 40)

        step = DeployStep(step_name)
        step.start()

        try:
            result = func(*args, **kwargs)
            step.success()
            print(f"  ✅ 完成")
            return result
        except Exception as e:
            step.fail(str(e))
            print(f"  ❌ 失败: {e}")
            raise
        finally:
            self.pipeline.steps.append(step)

    def run_pipeline(self, version: str, steps: list):
        """运行完整部署流水线"""
        self.pipeline = DeployPipeline(version=version)
        self.pipeline.start()

        success = True
        for step_name, func, args, kwargs in steps:
            try:
                self.execute_step(step_name, func, *args, **kwargs)
            except Exception as e:
                success = False
                break

        self.pipeline.finish(success)
        return success

# ============ 模拟部署操作 ============
def step_package(version: str) -> str:
    """步骤1: 打包"""
    print("  📦 创建部署包...")
    time.sleep(0.5)
    return f"builds/app-{version}.tar.gz"

def step_upload(package: str, remote_host: str) -> str:
    """步骤2: 上传"""
    print(f"  ⬆️  上传到 {remote_host}...")
    time.sleep(0.3)
    return f"/tmp/{os.path.basename(package)}"

def step_backup(remote_host: str, app_dir: str) -> str:
    """步骤3: 备份"""
    print("  📦 备份当前版本...")
    time.sleep(0.2)
    return f"{app_dir}/backups/v1.0.0_20240101"

def step_deploy(remote_path: str, app_dir: str):
    """步骤4: 部署"""
    print("  📂 解压部署包...")
    time.sleep(0.3)

def step_install_deps(app_dir: str):
    """步骤5: 安装依赖"""
    print("  📥 安装 Python 依赖...")
    time.sleep(0.5)

def step_restart(service_name: str):
    """步骤6: 重启服务"""
    print(f"  🔄 重启 {service_name}...")
    time.sleep(0.3)

def step_health_check(service_name: str) -> bool:
    """步骤7: 健康检查"""
    print("  🏥 执行健康检查...")
    time.sleep(0.2)
    return True  # 模拟成功

def step_notify(version: str, success: bool):
    """步骤8: 通知"""
    if success:
        print(f"  📤 发送成功通知...")
    else:
        print(f"  📤 发送失败告警...")

# ============ 运行演示 ============
if __name__ == '__main__':
    executor = DeploymentExecutor()

    version = "1.2.0"
    remote_host = "192.168.1.100"
    app_dir = "/opt/myapp"
    service_name = "myapp"

    steps = [
        ("打包", step_package, [version], {}),
        ("上传", step_upload, [f"builds/app-{version}.tar.gz", remote_host], {}),
        ("备份", step_backup, [remote_host, app_dir], {}),
        ("部署", step_deploy, [f"/tmp/app-{version}.tar.gz", app_dir], {}),
        ("安装依赖", step_install_deps, [app_dir], {}),
        ("重启服务", step_restart, [service_name], {}),
        ("健康检查", step_health_check, [service_name], {}),
        ("通知", step_notify, [version, True], {}),
    ]

    success = executor.run_pipeline(version, steps)

    # 打印流水线摘要
    print("\n📊 部署摘要:")
    print(f"  版本: {executor.pipeline.version}")
    print(f"  状态: {executor.pipeline.status.value}")
    print(f"  步骤: {len(executor.pipeline.steps)}")
    for step in executor.pipeline.steps:
        status_icon = "✅" if step.status == DeployStatus.SUCCESS else "❌"
        duration = ""
        if step.start_time and step.end_time:
            d = (step.end_time - step.start_time).total_seconds()
            duration = f" ({d:.1f}s)"
        print(f"    {status_icon} {step.name}{duration}")