from __future__ import annotations

from collections.abc import Sequence
from enum import StrEnum
from typing import Any

from pydantic import BaseModel, field_validator

from dify_graph.entities.base_node_data import BaseNodeData


class VariableSelector(BaseModel):
    """
    Variable Selector.
    """

    variable: str
    value_selector: Sequence[str]


class OutputVariableType(StrEnum):
    STRING = "string"
    NUMBER = "number"
    INTEGER = "integer"
    SECRET = "secret"
    BOOLEAN = "boolean"
    OBJECT = "object"
    FILE = "file"
    ARRAY = "array"
    ARRAY_STRING = "array[string]"
    ARRAY_NUMBER = "array[number]"
    ARRAY_OBJECT = "array[object]"
    ARRAY_BOOLEAN = "array[boolean]"
    ARRAY_FILE = "array[file]"
    ANY = "any"
    ARRAY_ANY = "array[any]"


class OutputVariableEntity(BaseModel):
    """
    Output Variable Entity.
    """

    variable: str
    value_type: OutputVariableType = OutputVariableType.ANY
    value_selector: Sequence[str]

    @field_validator("value_type", mode="before")
    @classmethod
    def normalize_value_type(cls, v: Any) -> Any:
        """
        Normalize value_type to handle case-insensitive array types.
        Converts 'Array[...]' to 'array[...]' for backward compatibility.
        """
        if isinstance(v, str) and v.startswith("Array["):
            return v.lower()
        return v


class BaseIterationNodeData(BaseNodeData):
    start_node_id: str | None = None


class BaseIterationState(BaseModel):
    iteration_node_id: str
    index: int
    inputs: dict

    class MetaData(BaseModel):
        pass

    metadata: MetaData


class BaseLoopNodeData(BaseNodeData):
    start_node_id: str | None = None


class BaseLoopState(BaseModel):
    loop_node_id: str
    index: int
    inputs: dict

    class MetaData(BaseModel):
        pass

    metadata: MetaData