src/components/model_step/model_step.py

import json
from typing import Any

import gradio as gr
from gradio.components import FormComponent

from app_configs import UNSELECTED_VAR_NAME
from components.model_pipeline.state_manager import ModelStepUIState, PipelineState, PipelineStateManager
from utils import get_full_model_name
from workflows.structs import ModelStep

from .state_manager import ModelStepStateManager
from .ui_components import InputRowButtonGroup, OutputRowButtonGroup


def _make_accordion_label(model_step: ModelStep):
    name = model_step.name if model_step.name else "Untitled"
    input_field_names = [field.name for field in model_step.input_fields]
    inputs_str = ", ".join(input_field_names)
    output_field_names = [field.name for field in model_step.output_fields]
    outputs_str = ", ".join(output_field_names)
    return "{}: {} ({}) → ({})".format(model_step.id, name, inputs_str, outputs_str)


class ModelStepComponent(FormComponent):
    """
    A custom Gradio component representing a single Step in a pipeline.
    It contains:
      1. Model Provider & System Prompt
      2. Inputs – fields with name, description, and variable used
      3. Outputs – fields with name, description, and variable used

    Listens to events:
        - on_model_step_change
        - on_ui_change
    """

    def __init__(
        self,
        value: ModelStep | gr.State,
        ui_state: ModelStepUIState | gr.State | None = None,
        model_options: list[str] | None = None,
        input_variables: list[str] | None = None,
        max_input_fields=5,
        max_output_fields=5,
        pipeline_state_manager: PipelineStateManager | None = None,
        **kwargs,
    ):
        self.max_fields = {
            "input": max_input_fields,
            "output": max_output_fields,
        }
        self.model_options = model_options
        self.input_variables = [UNSELECTED_VAR_NAME] + input_variables
        self.sm = ModelStepStateManager(max_input_fields, max_output_fields)
        self.pipeline_sm: PipelineStateManager = pipeline_state_manager

        self.model_step_state = gr.State(value)
        ui_state = ui_state or ModelStepUIState()
        if not isinstance(ui_state, gr.State):
            ui_state = gr.State(ui_state)
        self.ui_state: gr.State = ui_state

        self.inputs_count_state = gr.State(len(value.input_fields))
        self.outputs_count_state = gr.State(len(value.output_fields))

        # UI components that will be created in render
        self.accordion = None
        self.ui = None
        self.step_name_input = None
        self.model_selection = None
        self.system_prompt = None
        self.input_rows = []
        self.output_rows = []

        super().__init__(**kwargs)
        # self.render()
        self.setup_event_listeners()

    @property
    def model_step(self) -> ModelStep:
        return self.model_step_state.value

    @property
    def step_id(self) -> str:
        return self.model_step.id

    def get_step_config(self) -> dict:
        return self.model_step.model_dump()

    # UI state accessors
    def is_open(self) -> bool:
        return self.ui_state.value.expanded

    def get_active_tab(self) -> str:
        """Get the current active tab."""
        return self.ui_state.value.active_tab

    def _render_input_row(self, i: int) -> tuple[gr.Row, tuple, tuple]:
        """Render a single input row at index i."""
        inputs = self.model_step.input_fields
        is_visible = i < len(inputs)
        label_visible = i == 0
        disable_delete = i == 0 and len(inputs) == 1
        initial_name = inputs[i].name if is_visible else ""
        initial_desc = inputs[i].description if is_visible else ""
        initial_var = inputs[i].variable or UNSELECTED_VAR_NAME if is_visible else UNSELECTED_VAR_NAME

        with gr.Row(visible=is_visible, elem_classes="field-row form") as row:
            button_group = InputRowButtonGroup(disable_delete=disable_delete)

            inp_var = gr.Dropdown(
                choices=self.input_variables,
                label="Variable Used",
                value=initial_var,
                elem_classes="field-variable",
                scale=1,
                show_label=label_visible,
            )
            inp_name = gr.Textbox(
                label="Input Name",
                placeholder="Field name",
                value=initial_name,
                elem_classes="field-name",
                scale=1,
                show_label=label_visible,
            )
            inp_desc = gr.Textbox(
                label="Description",
                placeholder="Field description",
                value=initial_desc,
                elem_classes="field-description",
                scale=3,
                show_label=label_visible,
            )
            fields = (inp_name, inp_var, inp_desc)
            # buttons = (delete_button, add_button)
        return row, fields, button_group

    def _render_output_row(self, i: int) -> tuple[gr.Row, tuple, tuple]:
        """Render a single output row at index i."""
        outputs = self.model_step.output_fields
        is_visible = i < len(outputs)
        label_visible = i == 0
        disable_delete = i == 0 and len(outputs) == 1
        initial_name = outputs[i].name if is_visible else ""
        initial_desc = outputs[i].description if is_visible else ""
        initial_type = outputs[i].type if is_visible else "str"
        with gr.Row(visible=is_visible, elem_classes="field-row") as row:
            button_group = OutputRowButtonGroup(disable_delete=disable_delete)

            out_name = gr.Textbox(
                label="Output Field",
                placeholder="Variable identifier",
                value=initial_name,
                elem_classes="field-name",
                scale=1,
                show_label=label_visible,
            )
            out_type = gr.Dropdown(
                choices=["str", "int", "float", "bool"],
                allow_custom_value=True,
                label="Type",
                value=initial_type,
                elem_classes="field-type",
                scale=0,
                show_label=label_visible,
                interactive=True,
            )
            out_desc = gr.Textbox(
                label="Description",
                placeholder="Field description",
                value=initial_desc,
                elem_classes="field-description",
                scale=3,
                show_label=label_visible,
            )

            fields = (out_name, out_type, out_desc)
        return row, fields, button_group

    def _render_prompt_tab_content(self):
        self.system_prompt = gr.Textbox(
            label="System Prompt",
            placeholder="Enter the system prompt for this step",
            lines=5,
            value=self.model_step.system_prompt,
            elem_classes="system-prompt",
        )

    def _render_inputs_tab_content(self):
        with gr.Column(variant="panel", elem_classes="fields-panel") as self.inputs_column:
            # Render input rows using helper method
            for i in range(self.max_fields["input"]):
                row = self._render_input_row(i)
                self.input_rows.append(row)

    def _render_outputs_tab_content(self):
        with gr.Column(variant="panel", elem_classes="fields-panel") as self.outputs_column:
            # Render output rows using helper method
            for i in range(self.max_fields["output"]):
                row = self._render_output_row(i)
                self.output_rows.append(row)

    def _render_tab_content(self, tab_id: str):
        if tab_id == "model-tab":
            self._render_prompt_tab_content()
        elif tab_id == "inputs-tab":
            self._render_inputs_tab_content()
        elif tab_id == "outputs-tab":
            self._render_outputs_tab_content()

    def _render_header(self, model_options: tuple[str]):
        # Header with step name
        with gr.Row(elem_classes="step-header-row"):
            self.step_name_input = gr.Textbox(
                label="",
                value=self.model_step.name,
                elem_classes="step-name",
                show_label=False,
                placeholder="Model name...",
            )
            unselected_choice = "Select Model..."
            current_value = (
                get_full_model_name(self.model_step.model, self.model_step.provider)
                if self.model_step.model
                else unselected_choice
            )
            self.model_selection = gr.Dropdown(
                choices=[unselected_choice] + model_options,
                label="Model Provider",
                show_label=False,
                value=current_value,
                elem_classes="model-dropdown",
                scale=1,
            )
            self.temperature_slider = gr.Slider(
                value=self.model_step.temperature,
                minimum=0.0,
                maximum=5,
                step=0.05,
                info="Temperature",
                show_label=False,
                show_reset_button=False,
            )

    def render(self):
        """Render the component UI"""
        # Reset UI component lists
        self.input_rows = []
        self.output_rows = []
        self.tabs = {}

        # Create the accordion for this step
        accordion_label = _make_accordion_label(self.model_step)
        self.accordion = gr.Accordion(label=accordion_label, open=self.is_open(), elem_classes="step-accordion")

        # Create the UI content inside the accordion
        with self.accordion:
            self._render_header(self.model_options)

            # Configuration tabs
            selected_tab = self.get_active_tab()
            with gr.Tabs(elem_classes="step-tabs", selected=selected_tab):
                tab_ids = ("model-tab", "inputs-tab", "outputs-tab")
                tab_labels = ("Model", "Inputs", "Outputs")
                for tab_id, label in zip(tab_ids, tab_labels):
                    with gr.TabItem(label, elem_classes="tab-content", id=tab_id) as tab:
                        self._render_tab_content(tab_id)
                        self.tabs[tab_id] = tab

        return self.accordion

    def _setup_event_listeners_for_view_change(self):
        for tab_id, tab in self.tabs.items():
            tab.select(
                fn=self.sm.update_ui_state,
                inputs=[self.ui_state, gr.State("active_tab"), gr.State(tab_id)],
                outputs=[self.ui_state],
            )
        self.accordion.collapse(
            fn=self.sm.update_ui_state,
            inputs=[self.ui_state, gr.State("expanded"), gr.State(False)],
            outputs=[self.ui_state],
        )
        self.accordion.expand(
            fn=self.sm.update_ui_state,
            inputs=[self.ui_state, gr.State("expanded"), gr.State(True)],
            outputs=[self.ui_state],
        )

    def _setup_event_listeners_model_tab(self):
        # Step name change
        self.step_name_input.blur(
            fn=self._update_state_and_label,
            inputs=[self.model_step_state, self.step_name_input],
            outputs=[self.model_step_state, self.accordion],
        )

        self.temperature_slider.release(
            fn=self.sm.update_temperature,
            inputs=[self.model_step_state, self.temperature_slider],
            outputs=[self.model_step_state],
        )

        # Model and system prompt
        self.model_selection.input(
            fn=self.sm.update_model_and_provider,
            inputs=[self.model_step_state, self.model_selection],
            outputs=[self.model_step_state],
        )

        self.system_prompt.blur(
            fn=self.sm.update_system_prompt,
            inputs=[self.model_step_state, self.system_prompt],
            outputs=[self.model_step_state],
        )

    def _setup_event_listeners_inputs_tab(self):
        # Setup input row events
        for i, (row, fields, button_group) in enumerate(self.input_rows):
            inp_name, inp_var, inp_desc = fields
            row_index = gr.State(i)

            # Field change handlers
            inp_name.blur(
                fn=self.sm.update_input_field_name,
                inputs=[self.model_step_state, inp_name, row_index],
                outputs=[self.model_step_state],
            )

            inp_var.change(
                fn=self.sm.update_input_field_variable,
                inputs=[self.model_step_state, inp_var, inp_name, row_index],
                outputs=[self.model_step_state],
            )

            inp_desc.blur(
                fn=self.sm.update_input_field_description,
                inputs=[self.model_step_state, inp_desc, row_index],
                outputs=[self.model_step_state],
            )

            rows = [row for (row, _, _) in self.input_rows]
            input_fields = [field for (_, fields, _) in self.input_rows for field in fields]

            # Button handlers
            button_group.delete(
                fn=self.sm.delete_input_field,
                inputs=[self.model_step_state, row_index],
                outputs=[self.model_step_state, self.inputs_count_state] + rows + input_fields,
            )

            button_group.add(
                fn=self.sm.add_input_field,
                inputs=[self.model_step_state, row_index],
                outputs=[self.model_step_state, self.inputs_count_state] + rows + input_fields,
            )

    def _setup_event_listeners_outputs_tab(self):
        # Setup output row events
        for i, (row, fields, button_group) in enumerate(self.output_rows):
            out_name, out_type, out_desc = fields

            row_index = gr.State(i)

            # Field change handlers
            out_name.blur(
                fn=self.sm.update_output_field_name,
                inputs=[self.model_step_state, out_name, row_index],
                outputs=[self.model_step_state],
            )

            out_type.change(
                fn=self.sm.update_output_field_type,
                inputs=[self.model_step_state, out_type, row_index],
                outputs=[self.model_step_state],
            )

            out_desc.blur(
                fn=self.sm.update_output_field_description,
                inputs=[self.model_step_state, out_desc, row_index],
                outputs=[self.model_step_state],
            )

            rows = [row for (row, _, _) in self.output_rows]
            output_fields = [field for (_, fields, _) in self.output_rows for field in fields]

            # Button handlers
            button_group.delete(
                fn=self.sm.delete_output_field,
                inputs=[self.model_step_state, row_index],
                outputs=[self.model_step_state, self.outputs_count_state] + rows + output_fields,
            )

            button_group.add(
                fn=self.sm.add_output_field,
                inputs=[self.model_step_state, row_index],
                outputs=[self.model_step_state, self.outputs_count_state] + rows + output_fields,
            )

            button_group.up(
                fn=self.sm.move_output_field,
                inputs=[self.model_step_state, row_index, gr.State("up")],
                outputs=[self.model_step_state] + output_fields,
            )

            button_group.down(
                fn=self.sm.move_output_field,
                inputs=[self.model_step_state, row_index, gr.State("down")],
                outputs=[self.model_step_state] + output_fields,
            )

    # Function to set up event listeners - call this separately after all components are rendered
    def setup_event_listeners(self):
        """Set up all event listeners for this component"""
        self._setup_event_listeners_for_view_change()
        self._setup_event_listeners_model_tab()
        self._setup_event_listeners_inputs_tab()
        self._setup_event_listeners_outputs_tab()

        def state_str(x, limited: bool = False):
            d = x.model_dump()
            if limited:
                d = {k: d[k] for k in {"name", "temperature"}}
            return json.dumps(d, indent=2)

        def log_step_states(x, y, src: str):
            print(f"{src} triggered! UI:\n{state_str(x)}\n\nData:\n{state_str(y, True)}")
            print("--------------------------------")
            print(f"self.model_step_state: \n{self.get_step_config()}")
            print("--------------------------------")

        # self.model_step_state.change(
        #     log_step_states,
        #     inputs=[self.ui_state, self.model_step_state, gr.State("Model Change")],
        # )
        # self.ui_state.change(
        #     log_step_states,
        #     inputs=[self.ui_state, self.model_step_state, gr.State("UI Change")],
        # )

    def on_model_step_change(self, fn, inputs, outputs):
        """Set up an event listener for the model change event."""
        return self.model_step_state.change(fn, inputs, outputs)

    def on_ui_change(self, fn, inputs, outputs):
        """Set up an event listener for the UI change event."""
        return self.ui_state.change(fn, inputs, outputs)

    def _update_state_and_label(self, model_step: ModelStep, name: str):
        """Update both the state and the accordion label."""
        new_model_step = self.sm.update_step_name(model_step, name)
        new_label = _make_accordion_label(new_model_step)
        return new_model_step, gr.update(label=new_label)

    def refresh_variable_dropdowns(self, pipeline_state: PipelineState):
        # TODO: Fix this. Not sure why this is needed.
        """Refresh the variable dropdown options in all input rows."""
        variable_choices = []
        if self.pipeline_sm is not None:
            variable_choices = self.pipeline_sm.get_all_variables(pipeline_state)

        for _, fields, _ in self.input_rows:
            _, inp_var, _ = fields
            inp_var.update(choices=variable_choices)

    def _update_model_and_refresh_ui(self, updated_model_step):
        """Update the model step state and refresh UI elements that depend on it."""
        self.model_step_state.value = updated_model_step
        # Update accordion label
        new_label = _make_accordion_label(updated_model_step)
        if self.accordion:
            self.accordion.update(label=new_label)
        return updated_model_step