from typing import Any, Literal

from pydantic import BaseModel, Field, model_validator

from workflows.structs import ModelStep, TossupWorkflow, Workflow


def make_step_id(step_number: int):
    """Make a step id from a step name."""
    if step_number < 26:
        return chr(ord("A") + step_number)
    else:
        # For more than 26 steps, use AA, AB, AC, etc.
        first_char = chr(ord("A") + (step_number // 26) - 1)
        second_char = chr(ord("A") + (step_number % 26))
        return f"{first_char}{second_char}"


def make_step_number(step_id: str):
    """Make a step number from a step id."""
    if len(step_id) == 1:
        return ord(step_id) - ord("A")
    else:
        return (ord(step_id[0]) - ord("A")) * 26 + (ord(step_id[1]) - ord("A")) + 1


class ModelStepUIState(BaseModel):
    """Represents the UI state for a model step component."""

    expanded: bool = True
    active_tab: Literal["model-tab", "inputs-tab", "outputs-tab"] = "model-tab"

    class Config:
        frozen = True

    def update(self, key: str, value: Any) -> "ModelStepUIState":
        """Update the UI state."""
        return self.model_copy(update={key: value})


class PipelineUIState(BaseModel):
    """Represents the UI state for a pipeline component."""

    step_ids: list[str] = Field(default_factory=list)
    steps: dict[str, ModelStepUIState] = Field(default_factory=dict)

    def model_post_init(self, __context: Any) -> None:
        if not self.steps and self.step_ids:
            self.steps = {step_id: ModelStepUIState() for step_id in self.step_ids}
        return super().model_post_init(__context)

    def get_step_position(self, step_id: str):
        """Get the position of a step in the pipeline."""
        return next((i for i, step in enumerate(self.step_ids) if step == step_id), None)

    @property
    def n_steps(self) -> int:
        """Get the number of steps in the pipeline."""
        return len(self.step_ids)

    @classmethod
    def from_workflow(cls, workflow: Workflow):
        """Create a pipeline UI state from a workflow."""
        return PipelineUIState(
            step_ids=list(workflow.steps.keys()),
            steps={step_id: ModelStepUIState() for step_id in workflow.steps.keys()},
        )

    @classmethod
    def from_pipeline_state(cls, pipeline_state: "PipelineState"):
        """Create a pipeline UI state from a pipeline state."""
        return cls.from_workflow(pipeline_state.workflow)

    # Update methods

    def insert_step(self, step_id: str, position: int = -1) -> "PipelineUIState":
        """Insert a step into the pipeline at the given position."""
        if position == -1:
            position = len(self.step_ids)
        self.step_ids.insert(position, step_id)
        steps = self.steps | {step_id: ModelStepUIState()}
        return self.model_copy(update={"step_ids": self.step_ids, "steps": steps})

    def remove_step(self, step_id: str) -> "PipelineUIState":
        """Remove a step from the pipeline."""
        if step_id not in self.step_ids:
            raise ValueError(f"Step {step_id} not found in pipeline. Step IDs: {self.step_ids}")
        self.step_ids.remove(step_id)
        self.steps.pop(step_id)
        return self.model_copy(update={"step_ids": self.step_ids, "steps": self.steps})

    def update_step(self, step_id: str, ui_state: ModelStepUIState) -> "PipelineUIState":
        """Update a step in the pipeline."""
        if step_id not in self.steps:
            raise ValueError(f"Step {step_id} not found in pipeline. Step IDs: {self.step_ids}")
        return self.model_copy(update={"steps": self.steps | {step_id: ui_state}})


class PipelineState(BaseModel):
    """Represents the state for a pipeline component."""

    workflow: Workflow
    ui_state: PipelineUIState

    @classmethod
    def from_workflow(cls, workflow: Workflow):
        """Create a pipeline state from a workflow."""
        return cls(workflow=workflow, ui_state=PipelineUIState.from_workflow(workflow))

    def update_workflow(self, workflow: Workflow) -> "PipelineState":
        return self.model_copy(update={"workflow": workflow})

    def insert_step(self, position: int, step: ModelStep) -> "PipelineState":
        if step.id in self.workflow.steps:
            raise ValueError(f"Step {step.id} already exists in pipeline")

        # Validate position
        if position != -1 and (position < 0 or position > self.n_steps):
            raise ValueError(f"Invalid position: {position}. Must be between 0 and {self.n_steps} or -1")

        # Create a new workflow with updated steps
        workflow = self.workflow.add_step(step)

        self.ui_state = self.ui_state.insert_step(step.id, position)

        # Return a new PipelineState with the updated workflow
        return self.model_copy(update={"workflow": workflow, "ui_state": self.ui_state})

    def remove_step(self, position: int) -> "PipelineState":
        step_id = self.ui_state.step_ids[position]

        workflow = self.workflow.remove_step(step_id)
        ui_state = self.ui_state.remove_step(step_id)
        return self.model_copy(update={"workflow": workflow, "ui_state": ui_state})

    def update_step(self, step: ModelStep, ui_state: ModelStepUIState | None = None) -> "PipelineState":
        """Update a step in the pipeline."""
        if step.id not in self.workflow.steps:
            raise ValueError(f"Step {step.id} not found in pipeline")
        workflow = self.workflow.update_step(step)
        update = {"workflow": workflow}
        if ui_state is not None:
            update["ui_state"] = self.ui_state.update_step(step.id, ui_state)
        return self.model_copy(update=update)

    def get_available_variables(self, model_step_id: str | None = None) -> list[str]:
        """Get all variables from all steps."""
        available_variables = self.available_variables
        if model_step_id is None:
            return available_variables
        prefix = f"{model_step_id}."
        return [var for var in available_variables if not var.startswith(prefix)]

    @property
    def available_variables(self) -> list[str]:
        return self.workflow.get_available_variables()

    @property
    def n_steps(self) -> int:
        return len(self.workflow.steps)

    def get_new_step_id(self) -> str:
        """Get a step ID for a new step."""
        if not self.workflow.steps:
            return "A"
        else:
            last_step_number = max(map(make_step_number, self.workflow.steps.keys()))
            return make_step_id(last_step_number + 1)


class TossupPipelineState(PipelineState):
    workflow: TossupWorkflow