"""
Pydantic schemas for Project API.
Defines request and response models for project operations.
"""
from datetime import datetime
from typing import Optional, List
from enum import Enum
from pydantic import BaseModel, Field


# ============== 枚举定义 ==============

class ProjectStatus(str, Enum):
    """项目状态"""
    DRAFT = "draft"
    CONFIGURING = "configuring"
    READY = "ready"
    IN_PROGRESS = "in_progress"
    COMPLETED = "completed"


class ProjectSource(str, Enum):
    """项目来源"""
    INTERNAL = "internal"
    EXTERNAL = "external"


# ============== 基础Schema ==============

class ProjectCreate(BaseModel):
    """Schema for creating a new project."""
    
    name: str = Field(..., min_length=1, description="Project name")
    description: str = Field(default="", description="Project description")
    config: str = Field(..., min_length=1, description="Label Studio configuration")
    task_type: Optional[str] = Field(None, description="Task type (text_classification, image_classification, object_detection, ner)")
    
    class Config:
        json_schema_extra = {
            "example": {
                "name": "Image Classification Project",
                "description": "Classify images into categories",
                "config": "<View><Image name='image' value='$image'/><Choices name='choice' toName='image'><Choice value='Cat'/><Choice value='Dog'/></Choices></View>",
                "task_type": "image_classification"
            }
        }


class ProjectUpdate(BaseModel):
    """Schema for updating an existing project."""
    
    name: Optional[str] = Field(None, min_length=1, description="Project name")
    description: Optional[str] = Field(None, description="Project description")
    config: Optional[str] = Field(None, min_length=1, description="Label Studio configuration")
    
    class Config:
        json_schema_extra = {
            "example": {
                "name": "Updated Project Name",
                "description": "Updated description"
            }
        }


class ProjectResponse(BaseModel):
    """Schema for project response."""
    
    id: str = Field(..., description="Project unique identifier")
    name: str = Field(..., description="Project name")
    description: str = Field(..., description="Project description")
    config: str = Field(..., description="Label Studio configuration")
    created_at: datetime = Field(..., description="Project creation timestamp")
    task_count: int = Field(default=0, description="Number of tasks in project")
    
    class Config:
        json_schema_extra = {
            "example": {
                "id": "proj_123abc",
                "name": "Image Classification Project",
                "description": "Classify images into categories",
                "config": "<View><Image name='image' value='$image'/></View>",
                "created_at": "2024-01-12T10:30:00",
                "task_count": 5
            }
        }


# ============== 扩展Schema（对外API支持） ==============

class LabelConfig(BaseModel):
    """标签配置"""
    name: str = Field(..., description="标签名称")
    color: Optional[str] = Field(None, description="标签颜色（十六进制）")
    hotkey: Optional[str] = Field(None, description="快捷键")
    
    class Config:
        json_schema_extra = {
            "example": {
                "name": "正面",
                "color": "#52c41a",
                "hotkey": "1"
            }
        }


class ProjectStatusUpdate(BaseModel):
    """项目状态更新请求"""
    status: ProjectStatus = Field(..., description="目标状态")
    
    class Config:
        json_schema_extra = {
            "example": {
                "status": "ready"
            }
        }


class ProjectConfigUpdate(BaseModel):
    """项目配置更新请求"""
    config: str = Field(..., description="XML配置")
    labels: Optional[List[LabelConfig]] = Field(None, description="标签列表")
    task_type: Optional[str] = Field(None, description="任务类型")
    
    class Config:
        json_schema_extra = {
            "example": {
                "config": "<View>...</View>",
                "labels": [
                    {"name": "正面", "color": "#52c41a"},
                    {"name": "负面", "color": "#f5222d"}
                ],
                "task_type": "text_classification"
            }
        }


class ProjectResponseExtended(BaseModel):
    """扩展的项目响应（包含状态和来源）"""
    id: str = Field(..., description="项目ID")
    name: str = Field(..., description="项目名称")
    description: str = Field(..., description="项目描述")
    config: str = Field(..., description="XML配置")
    task_type: Optional[str] = Field(None, description="任务类型")
    status: ProjectStatus = Field(default=ProjectStatus.DRAFT, description="项目状态")
    source: ProjectSource = Field(default=ProjectSource.INTERNAL, description="项目来源")
    external_id: Optional[str] = Field(None, description="外部系统项目ID")
    created_at: datetime = Field(..., description="创建时间")
    updated_at: Optional[datetime] = Field(None, description="更新时间")
    task_count: int = Field(default=0, description="总任务数")
    completed_task_count: int = Field(default=0, description="已完成任务数")
    assigned_task_count: int = Field(default=0, description="已分配任务数")
    
    class Config:
        json_schema_extra = {
            "example": {
                "id": "proj_123abc",
                "name": "图像分类项目",
                "description": "对商品图片进行分类",
                "config": "<View>...</View>",
                "task_type": "image_classification",
                "status": "in_progress",
                "source": "external",
                "external_id": "sample_center_001",
                "created_at": "2024-01-12T10:30:00",
                "updated_at": "2024-01-12T15:30:00",
                "task_count": 100,
                "completed_task_count": 45,
                "assigned_task_count": 100
            }
        }