import json

import gradio as gr
import yaml

from components.model_pipeline.state_manager import (
    ModelStepUIState,
    PipelineState,
    PipelineStateManager,
    PipelineUIState,
)
from components.model_step.model_step import ModelStepComponent
from components.utils import make_state
from workflows.structs import ModelStep, Workflow
from workflows.validators import WorkflowValidator


def validate_simple_workflow(workflow: Workflow, required_output_variables: list[str]) -> Workflow:
    """Validate the workflow."""
    step = next(iter(workflow.steps.values()))
    if not step.output_fields:
        raise ValueError("No output fields found in the workflow")
    output_field_names = {output.name for output in step.output_fields}
    if not set(required_output_variables) <= output_field_names:
        missing_vars = required_output_variables - output_field_names
        raise ValueError(f"Missing required output variables: {missing_vars}")
    return workflow


def validate_complex_workflow(workflow: Workflow, required_output_variables: list[str]) -> Workflow:
    """Validate the workflow."""
    print("Validating complex workflow.")
    return workflow
    step = next(iter(workflow.steps.values()))
    if not step.output_fields:
        raise ValueError("No output fields found in the workflow")
    output_field_names = {output.name for output in step.output_fields}
    if not output_field_names <= set(required_output_variables):
        missing_vars = output_field_names - set(required_output_variables)
        raise ValueError(f"Missing required output variables: {missing_vars}")
    return workflow


def parse_yaml_workflow(yaml_str: str) -> Workflow:
    """Parse a YAML workflow."""
    workflow = yaml.safe_load(yaml_str)
    return Workflow(**workflow)


def update_workflow_from_code(yaml_str: str, ui_state: PipelineUIState) -> PipelineState:
    """Update a workflow from a YAML string."""
    workflow = parse_yaml_workflow(yaml_str)
    ui_state = PipelineUIState.from_workflow(workflow)
    return PipelineState(workflow=workflow, ui_state=ui_state)


class PipelineInterface:
    """UI for the pipeline."""

    def __init__(
        self,
        workflow: Workflow,
        ui_state: PipelineUIState | None = None,
        model_options: list[str] = None,
        simple: bool = False,
    ):
        self.model_options = model_options
        self.simple = simple
        if not ui_state:
            ui_state = PipelineUIState.from_workflow(workflow)
        self.ui_state = make_state(ui_state)
        self.pipeline_state = make_state(PipelineState(workflow=workflow, ui_state=ui_state))
        self.variables_state = make_state(workflow.get_available_variables())

        self.sm = PipelineStateManager()
        self.input_variables = workflow.inputs
        self.required_output_variables = list(workflow.outputs.keys())

        # UI elements
        self.steps_container = None
        self.components = []

        # Render the pipeline UI
        self.render()

    def _render_step(
        self,
        model_step: ModelStep,
        step_ui_state: ModelStepUIState,
        available_variables: list[str],
        position: int = 0,
    ):
        with gr.Column(elem_classes="step-container"):
            # Create the step component
            step_interface = ModelStepComponent(
                value=model_step,
                ui_state=step_ui_state,
                model_options=self.model_options,
                input_variables=available_variables,
                pipeline_state_manager=self.sm,
            )

            step_interface.on_model_step_change(
                self.sm.update_model_step_state,
                inputs=[self.pipeline_state, step_interface.model_step_state, step_interface.ui_state],
                outputs=[self.pipeline_state, self.ui_state, self.variables_state],
            )

            step_interface.on_ui_change(
                self.sm.update_model_step_ui,
                inputs=[self.pipeline_state, step_interface.ui_state, gr.State(model_step.id)],
                outputs=[self.pipeline_state, self.ui_state],
            )

            if self.simple:
                return step_interface

            # Add step controls below
            with gr.Row(elem_classes="step-controls"):
                up_button = gr.Button("⬆️ Move Up", elem_classes="step-control-btn")
                down_button = gr.Button("⬇️ Move Down", elem_classes="step-control-btn")
                remove_button = gr.Button("🗑️ Remove", elem_classes="step-control-btn")

            buttons = (up_button, down_button, remove_button)
            self._assign_step_controls(buttons, position)

            return (step_interface, *buttons)

    def _assign_step_controls(self, buttons: tuple[gr.Button, gr.Button, gr.Button], position: int):
        up_button, down_button, remove_button = buttons
        position = gr.State(position)
        up_button.click(self.sm.move_up, inputs=[self.ui_state, position], outputs=self.ui_state)
        down_button.click(self.sm.move_down, inputs=[self.ui_state, position], outputs=self.ui_state)
        remove_button.click(
            self.sm.remove_step,
            inputs=[self.pipeline_state, position],
            outputs=[self.pipeline_state, self.ui_state, self.variables_state],
        )

    def _render_add_step_button(self, position: int):
        if position not in {0, -1}:
            raise ValueError("Position must be 0 or -1")
        row_class = "pipeline-header" if position == 0 else "pipeline-footer"
        with gr.Row(elem_classes=row_class):
            add_step_btn = gr.Button("➕ Add Step", elem_classes="add-step-button")
        add_step_btn.click(
            self.sm.add_step,
            inputs=[self.pipeline_state, gr.State(position)],
            outputs=[self.pipeline_state, self.ui_state, self.variables_state],
        )
        return add_step_btn

    def _render_output_fields(self, available_variables: list[str], pipeline_state: PipelineState):
        dropdowns = {}
        UNSET_VALUE = "Choose variable..."
        variable_options = [UNSET_VALUE] + [v for v in available_variables if v not in self.input_variables]
        with gr.Column(elem_classes="step-accordion"):
            with gr.Row(elem_classes="output-fields-header"):
                gr.Markdown("#### Final output variables mapping:")
            with gr.Row(elem_classes="output-fields-row"):
                for output_field in self.required_output_variables:
                    value = pipeline_state.workflow.outputs[output_field]
                    if not value:
                        value = UNSET_VALUE
                    dropdown = gr.Dropdown(
                        label=output_field,
                        value=value,
                        choices=variable_options,
                        interactive=True,
                        elem_classes="output-field-variable",
                        # show_label=False,
                    )
                    dropdown.change(
                        self.sm.update_output_variables,
                        inputs=[self.pipeline_state, gr.State(output_field), dropdown],
                        outputs=[self.pipeline_state],
                    )
                    dropdowns[output_field] = dropdown

        def update_choices(available_variables):
            """Update the choices for the dropdowns"""
            return [
                gr.update(choices=available_variables, value=None, selected=None) for dropdown in dropdowns.values()
            ]

        self.variables_state.change(
            update_choices,
            inputs=[self.variables_state],
            outputs=list(dropdowns.values()),
        )
        return dropdowns

    def validate_workflow(self, state: PipelineState) -> PipelineState:
        """Validate the workflow."""
        try:
            if self.simple:
                workflow = validate_simple_workflow(state.workflow, self.required_output_variables)
            else:
                workflow = validate_complex_workflow(state.workflow, self.required_output_variables)
            state.workflow = workflow
            return state
        except ValueError as e:
            raise gr.Error(e)

    def _render_pipeline_header(self):
        # Add Step button at top
        input_variables_str = ", ".join([f"`{variable}`" for variable in self.input_variables])
        output_variables_str = ", ".join([f"`{variable}`" for variable in self.required_output_variables])
        if self.simple:
            instruction = "Create a simple single LLM call pipeline that takes in the following input variables and outputs the following output variables:"
        else:
            instruction = "Create a pipeline that takes in the following input variables and outputs the following output variables:"
        gr.Markdown(f"### {instruction}")
        gr.Markdown(f"Input Variables: {input_variables_str}")
        gr.Markdown(f"Output Variables: {output_variables_str}")

        # if not self.simple:
        #     self._render_add_step_button(0)

    def render(self):
        """Render the pipeline UI."""
        # Create a placeholder for all the step components
        self.all_components = []

        # self.pipeline_state.change(
        #     lambda x, y: print(f"Pipeline state changed! UI:\n{x}\n\n Data:\n{y}"),
        #     inputs=[self.ui_state, self.pipeline_state],
        #     outputs=[],
        # )

        self._render_pipeline_header()

        # Function to render all steps
        @gr.render(inputs=[self.pipeline_state, self.ui_state])
        def render_steps(state, ui_state):
            """Render all steps in the pipeline"""
            workflow = state.workflow
            print(f"\nRerender triggered! Current UI State:{ui_state}")
            components = []

            step_objects = []  # Reset step objects list
            for i, step_id in enumerate(ui_state.step_ids):
                step_data = workflow.steps[step_id]
                step_ui_state = ui_state.steps[step_id]
                available_variables = self.sm.get_all_variables(state, step_id)
                sub_components = self._render_step(step_data, step_ui_state, available_variables, i)
                step_objects.append(sub_components)

            components.append(step_objects)

        # Bottom buttons
        if not self.simple:
            self._render_add_step_button(-1)

        @gr.render(inputs=[self.variables_state, self.pipeline_state])
        def render_output_fields(available_variables, pipeline_state):
            return self._render_output_fields(available_variables, pipeline_state)

        export_btn = gr.Button("Export Pipeline", elem_classes="export-button")
        # components.append(export_btn)

        # Add a code box to display the workflow JSON
        # with gr.Column(elem_classes="workflow-json-container"):
        with gr.Accordion("Pipeline Preview", open=False, elem_classes="pipeline-preview") as config_accordion:
            config_output = gr.Code(
                label="Workflow Configuration",
                language="yaml",
                elem_classes="workflow-json",
                interactive=True,
                autocomplete=True,
            )
        # components.append(config_accordion)

        config_output.blur(
            fn=update_workflow_from_code,
            inputs=[config_output, self.ui_state],
            outputs=[self.pipeline_state],
        )

        # Connect the export button to show the workflow JSON
        export_btn.click(self.validate_workflow, inputs=[self.pipeline_state], outputs=[self.pipeline_state]).success(
            fn=lambda: gr.update(visible=True, open=True), outputs=[config_accordion]
        )
        export_btn.click(
            fn=self.sm.get_formatted_config,
            inputs=[self.pipeline_state, gr.State("yaml")],
            outputs=[config_output],
            js="() => {document.querySelector('.pipeline-preview').scrollIntoView({behavior: 'smooth'})}",
        )

        # self.all_components = components