from datetime import datetime
from enum import Enum
from typing import Optional
from uuid import UUID

from pydantic import BaseModel, Field


class TemplateType(str, Enum):
    ROLE = "ROLE"
    SCENARIO = "SCENARIO"
    CUSTOM = "CUSTOM"


class PermissionTemplateVersionRead(BaseModel):
    id: UUID
    version: int
    change_log: Optional[str] = None
    created_at: datetime


class PermissionTemplateCreate(BaseModel):
    name: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = Field(None, max_length=500)
    template_type: TemplateType
    permissions: dict  # {role: {endpoint_key: allowed}}
    tags: Optional[str] = Field(None, max_length=200)
    category: Optional[str] = Field(None, max_length=50)
    recommended_roles: Optional[str] = Field(None, max_length=200)


class PermissionTemplateUpdate(BaseModel):
    name: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = Field(None, max_length=500)
    permissions: Optional[dict] = None
    tags: Optional[str] = Field(None, max_length=200)
    category: Optional[str] = Field(None, max_length=50)
    recommended_roles: Optional[str] = Field(None, max_length=200)


class PermissionTemplateRead(BaseModel):
    id: UUID
    name: str
    description: Optional[str] = None
    template_type: TemplateType
    is_system: bool
    created_by: Optional[UUID] = None
    created_at: datetime
    updated_at: datetime
    permissions: dict
    tags: Optional[str] = None
    category: Optional[str] = None
    recommended_roles: Optional[str] = None
    versions: list[PermissionTemplateVersionRead] = []

    class Config:
        from_attributes = True


class ApplyTemplateRequest(BaseModel):
    template_id: UUID
    roles: Optional[list[str]] = None
    override: bool = True


class ApplyTemplateResponse(BaseModel):
    study_id: UUID
    applied_roles: list[str]
    permissions: dict