"""
Experiment Workflow

Partial workflow that only runs ExperimentAgent for experiment execution.
Requires a pre-existing data summary (e.g., from DataWorkflow or manual input).
Useful for debugging the experiment phase independently.
"""

import shutil
from pathlib import Path
from typing import Literal

from loguru import logger
from pydantic import BaseModel, PrivateAttr

from scider.agents import experiment_agent
from scider.agents.experiment_agent.state import ExperimentAgentState
from scider.core.code_env import LocalEnv, WorkspaceInitConfig
from scider.core.constant import override_user_approval
from scider.workflows.utils import get_separator


class ExperimentWorkflow(BaseModel):
    """
    Experiment Workflow - runs only the ExperimentAgent.

    This workflow executes:
    1. ExperimentAgent - Generates code, executes experiments, produces metrics

    Requires:
    - data_summary: Either a string containing data analysis, or a path to data_analysis.md

    Usage:
        workflow = ExperimentWorkflow(
            workspace_path="workspace",
            user_query="Train an SVR model",
            data_summary="... analysis from DataAgent ...",
        )
        workflow.run()
        print(workflow.final_summary)
    """

    # ==================== INPUT ====================
    workspace_path: Path
    user_query: str
    data_summary: str  # Can be loaded from file or passed directly
    repo_source: str | None = None
    max_revisions: int = 5
    recursion_limit: int = 100
    # None → LocalEnv's default (uv-managed, auto `uv init`). Override to
    # point agents at a prebuilt venv or to skip `uv init` in the workspace.
    workspace_init_config: WorkspaceInitConfig | None = None

    # ==================== INTERNAL STATE ====================
    current_phase: Literal["init", "experiment", "complete", "failed"] = "init"

    # ==================== OUTPUT ====================
    final_status: Literal["success", "failed", "max_revisions_reached"] | None = None
    final_summary: str = ""
    execution_results: list = []
    current_revision: int = 0
    error_message: str | None = None
    experiment_agent_intermediate_state: list[dict] = []
    experiment_agent_history: list = []

    # Internal: compiled graph (lazy loaded)
    _experiment_agent_graph: object = PrivateAttr(default=None)

    def _ensure_graph(self):
        """Lazily compile agent graph."""
        if self._experiment_agent_graph is None:
            self._experiment_agent_graph = experiment_agent.build().compile()

    def _setup_directories(self):
        """Setup workspace directory."""
        self.workspace_path.mkdir(parents=True, exist_ok=True)

    @classmethod
    def from_data_analysis_file(
        cls,
        workspace_path: str | Path,
        user_query: str,
        data_analysis_path: str | Path | None = None,
        repo_source: str | None = None,
        max_revisions: int = 5,
        recursion_limit: int = 100,
        workspace_init_config: WorkspaceInitConfig | None = None,
    ) -> "ExperimentWorkflow":
        """
        Create ExperimentWorkflow by loading data summary from file.

        Args:
            workspace_path: Workspace directory for the experiment
            user_query: User's experiment objective
            data_analysis_path: Path to data_analysis.md (defaults to workspace/data_analysis.md)
            repo_source: Optional repository source
            max_revisions: Maximum revision loops
            recursion_limit: Recursion limit for ExperimentAgent

        Returns:
            ExperimentWorkflow instance
        """
        workspace_path = Path(workspace_path)

        if data_analysis_path is None:
            data_analysis_path = workspace_path / "data_analysis.md"
        else:
            data_analysis_path = Path(data_analysis_path)

        if not data_analysis_path.exists():
            raise FileNotFoundError(
                f"Data analysis file not found: {data_analysis_path}. "
                "Run DataWorkflow first or provide data_summary directly."
            )

        data_summary = data_analysis_path.read_text()

        return cls(
            workspace_path=workspace_path,
            user_query=user_query,
            data_summary=data_summary,
            repo_source=repo_source,
            max_revisions=max_revisions,
            recursion_limit=recursion_limit,
            workspace_init_config=workspace_init_config,
        )

    def run(self) -> "ExperimentWorkflow":
        """
        Run the experiment workflow.

        Returns:
            self (for chaining)
        """
        self._ensure_graph()
        self._setup_directories()

        logger.info(get_separator())
        logger.info("Starting Experiment Workflow")
        logger.info(get_separator())

        success = self._run_experiment_agent()

        self._finalize(success)

        return self

    def _run_experiment_agent(self) -> bool:
        """
        Run ExperimentAgent to generate and execute experiments.

        Returns:
            True if successful, False if failed
        """
        logger.info("Running ExperimentAgent")
        self.current_phase = "experiment"

        exp_state = ExperimentAgentState(
            workspace=LocalEnv(self.workspace_path, init_config=self.workspace_init_config),
            data_summary=self.data_summary,
            user_query=self.user_query,
            repo_source=self.repo_source,
            max_critic_retries=self.max_revisions,
        )

        from scider.workflows.history_export import capture_messages

        with capture_messages() as captured:
            try:
                result = self._experiment_agent_graph.invoke(
                    exp_state,
                    {"recursion_limit": self.recursion_limit},
                )
                result_state = ExperimentAgentState(**result)

                # Extract results
                self.final_status = result_state.final_status
                self.experiment_agent_intermediate_state = result_state.intermediate_state
                # Prefer captured (full pre-compact history) over result_state.history,
                # which compact() would have truncated.
                self.experiment_agent_history = list(captured)
                self.final_summary = result_state.final_summary or result_state.output_summary or ""
                self.current_phase = "complete"

                logger.info(f"ExperimentAgent completed: {self.final_status}")
                return True

            except Exception as e:
                # Preserve captured history so failure traces are not lost
                self.experiment_agent_history = list(captured)
                logger.exception("ExperimentAgent failed")
                self.error_message = f"ExperimentAgent failed: {e}"
                self.current_phase = "failed"
                self.final_status = "failed"
                return False

    def _finalize(self, success: bool):
        """Finalize the workflow."""
        logger.info("Finalizing experiment workflow")

        if not success and not self.final_summary:
            self.final_summary = f"# Experiment Workflow Failed\n\nError: {self.error_message}"

        # Save conversation history for debugging
        if self.experiment_agent_history:
            from scider.workflows.history_export import save_conversation_history

            try:
                save_conversation_history(
                    self.experiment_agent_history,
                    self.workspace_path / "experiment_agent_history.json",
                    agent_name="experiment",
                )
            except Exception as e:
                logger.warning("Failed to save experiment agent history: {}", e)

        logger.info(get_separator())
        logger.info(f"Experiment Workflow completed: {self.final_status}")
        logger.info(get_separator())

    def save_summary(self, path: str | Path | None = None) -> Path:
        """Save the final summary to a file."""
        if path is None:
            path = self.workspace_path / "experiment_summary.md"
        path = Path(path)
        path.write_text(self.final_summary)
        logger.info(f"Summary saved to {path}")
        return path


def run_experiment_workflow(
    workspace_path: str | Path,
    user_query: str,
    data_summary: str | None = None,
    data_analysis_path: str | Path | None = None,
    repo_source: str | None = None,
    max_revisions: int = 5,
    recursion_limit: int = 100,
    user_approval_enabled: bool = False,
    workspace_init_config: WorkspaceInitConfig | None = None,
) -> ExperimentWorkflow:
    """
    Convenience function to run the experiment workflow.

    Args:
        workspace_path: Workspace directory for the experiment
        user_query: User's experiment objective
        data_summary: Data analysis text (if not provided, loads from file)
        data_analysis_path: Path to data_analysis.md (defaults to workspace/data_analysis.md)
        repo_source: Optional repository source (local path or git URL)
        max_revisions: Maximum revision loops for experiment agent
        recursion_limit: Recursion limit for ExperimentAgent (default=100)
        workspace_init_config: Override LocalEnv init behaviour (uv init, PATH
            injection, env manager). Leave ``None`` for historical defaults.

    Returns:
        ExperimentWorkflow: Completed workflow with results
    """
    if data_summary is not None:
        workflow = ExperimentWorkflow(
            workspace_path=Path(workspace_path),
            user_query=user_query,
            data_summary=data_summary,
            repo_source=repo_source,
            max_revisions=max_revisions,
            recursion_limit=recursion_limit,
            workspace_init_config=workspace_init_config,
        )
    else:
        workflow = ExperimentWorkflow.from_data_analysis_file(
            workspace_path=workspace_path,
            user_query=user_query,
            data_analysis_path=data_analysis_path,
            repo_source=repo_source,
            max_revisions=max_revisions,
            recursion_limit=recursion_limit,
            workspace_init_config=workspace_init_config,
        )

    with override_user_approval(user_approval_enabled):
        return workflow.run()


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(
        description="Experiment Workflow - Run ExperimentAgent for code generation and execution",
        prog="python -m scider.workflows.experiment_workflow",
    )
    parser.add_argument("workspace_path", help="Workspace directory for the workflow")
    parser.add_argument("user_query", help="User's experiment objective")
    parser.add_argument(
        "data_analysis_path",
        nargs="?",
        default=None,
        help="Path to existing data_analysis.md file (optional)",
    )
    parser.add_argument(
        "--recursion-limit",
        type=int,
        default=100,
        help="Recursion limit for ExperimentAgent (default: 100)",
    )
    parser.add_argument(
        "--max-revisions",
        type=int,
        default=5,
        help="Maximum revision loops (default: 5)",
    )

    args = parser.parse_args()

    result = run_experiment_workflow(
        workspace_path=args.workspace_path,
        user_query=args.user_query,
        data_analysis_path=args.data_analysis_path,
        recursion_limit=args.recursion_limit,
        max_revisions=args.max_revisions,
    )

    print("\n" + get_separator())
    print("EXPERIMENT WORKFLOW COMPLETE")
    print(get_separator())
    print(f"\nStatus: {result.final_status}")
    print(f"\nFinal Summary:\n{result.final_summary}")