"""Project member schemas for cross-department collaboration."""
from pydantic import BaseModel, Field
from typing import Optional, List
from datetime import datetime
from enum import Enum


class ProjectMemberRole(str, Enum):
    """Roles that can be assigned to project members."""
    MEMBER = "member"
    ADMIN = "admin"


class ProjectMemberBase(BaseModel):
    """Base schema for project member."""
    user_id: str = Field(..., description="ID of the user to add as project member")
    role: ProjectMemberRole = Field(
        default=ProjectMemberRole.MEMBER,
        description="Role of the member: 'member' (view/edit tasks) or 'admin' (manage project)"
    )


class ProjectMemberCreate(ProjectMemberBase):
    """Schema for creating a project member."""
    pass


class ProjectMemberUpdate(BaseModel):
    """Schema for updating a project member."""
    role: ProjectMemberRole = Field(..., description="New role for the member")


class ProjectMemberResponse(ProjectMemberBase):
    """Schema for project member response."""
    id: str
    project_id: str
    added_by: str
    created_at: datetime

    class Config:
        from_attributes = True


class ProjectMemberWithDetails(ProjectMemberResponse):
    """Schema for project member with user details."""
    user_name: Optional[str] = None
    user_email: Optional[str] = None
    user_department_id: Optional[str] = None
    user_department_name: Optional[str] = None
    added_by_name: Optional[str] = None


class ProjectMemberListResponse(BaseModel):
    """Schema for listing project members."""
    members: List[ProjectMemberWithDetails]
    total: int