from pydantic import BaseModel, Field
from typing import Dict, List, Literal, Optional


class DeltaMessage(BaseModel):
    role: Optional[Literal["user", "assistant", "system"]] = None
    content: Optional[str] = None


class Prompt(BaseModel):
    examples: List[str] = []
    instruction: str
    template: str
    action_list: List[str]
    
    def build(self):
        if self.examples:
            example_str = '\n'.join([
                f'Example #{idx}:\n{ex}' for idx, ex in enumerate(self.examples)
            ])
            return self.template(example_list=example_str, instruction=self.instruction)
        else:
            return self.template(instruction=self.instruction)

class UserResponseStream(BaseModel):
    type: Literal["thought", "assistant", "info", "summary"] = "info"
    content: str