from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from typing import List, Dict, Any, Optional


class MessageText(BaseModel):
    text: list[str] = Field(default_factory=list)


class Message(BaseModel):
    text: MessageText | None = None
    payload: dict | None = None


class FulfillmentResponse(BaseModel):
    messages: list[Message] = Field(default_factory=list)


class SessionInfo(BaseModel):
    parameters: dict[str, Any] = Field(default_factory=dict)


class DialogflowResponse(BaseModel):
    fulfillment_response: FulfillmentResponse
    sessionInfo: Optional[SessionInfo] = Field(default_factory=dict)


def DialogFlowResponseAPI(
    text: list[str] = None,
    payload: dict | None = None,
    parameters: dict | None = None,
):

    messages = []
    if text:
        messages.append(Message(text=MessageText(text=text)))

    if payload:
        messages.append(Message(payload=payload))

    response_data = DialogflowResponse(
        fulfillment_response=FulfillmentResponse(messages=messages),
        sessionInfo=SessionInfo(parameters=parameters or {}),
    )

    return JSONResponse(content=response_data.model_dump())


def dialogflow_response(
    text: list[str] | None = None,
    payload: dict | None = None,
    parameters: dict | None = None,
) -> JSONResponse:
    messages: List[Message] = []
    if text:
        messages.append(Message(text=MessageText(text=text)))
    if payload:
        messages.append(Message(payload=payload))

    response = DialogflowResponse(
        fulfillment_response=FulfillmentResponse(messages=messages),
        sessionInfo=SessionInfo(parameters=parameters or {}),
    )
    return JSONResponse(content=response.model_dump(mode="json"))


def dialogflow_error(message: str) -> JSONResponse:
    return dialogflow_response(text=[message])


def dialogflow_choice(
    prompt: str, options: list[str], parameters: dict | None = None
) -> JSONResponse:
    chips = {
        "richContent": [[{"type": "chips", "options": [{"text": o} for o in options]}]]
    }
    return dialogflow_response(text=[prompt], payload=chips, parameters=parameters)


class DialogflowResponseBuilder:
    def __init__(self):
        self._messages: list[Message] = []
        self._parameters: dict = {}

    def add_text(self, lines: list[str]) -> "DialogflowResponseBuilder":
        if lines:
            self._messages.append(Message(text=MessageText(text=lines)))
        return self

    def add_payload(self, payload: dict) -> "DialogflowResponseBuilder":
        if payload:
            self._messages.append(Message(payload=payload))
        return self

    def add_choice_chips(
        self,
        options: list[str] | list[dict],
        key: str = None,
        prompt: str | None = None,
    ) -> "DialogflowResponseBuilder":
        if options:
            chips = {
                "richContent": [
                    [
                        {
                            "type": "chips",
                            "options": [
                                (
                                    {"text": option.get(key, "")}
                                    if isinstance(option, dict)
                                    else {"text": option}
                                )
                                for option in options
                            ],
                        }
                    ]
                ]
            }
            self.add_payload(chips)
        if prompt:
            self.add_text([prompt])
        return self

    def set_parameters(self, parameters: dict[str, any]) -> "DialogflowResponseBuilder":
        if parameters:
            self._parameters = parameters
        return self

    def build(self) -> JSONResponse:
        response = DialogflowResponse(
            fulfillment_response=FulfillmentResponse(messages=self._messages),
            sessionInfo=SessionInfo(parameters=self._parameters),
        )
        return JSONResponse(content=response.model_dump(mode="json"))


## Use Builder return (
#     DialogflowResponseBuilder()
#     .add_choice_chips(["Xem vé", "Đặt vé"], prompt="Bạn muốn làm gì tiếp?")
#     .set_parameters({"next_step": "booking"})
#     .build()
# )


class DialogServiceResult(BaseModel):
    text: list[str] | None = None
    options: list[str] | list[dict] | None = None
    parameters: dict | None = None