//! Trait implementations for existing classes
//!
//! This module implements the delegation traits for existing FFI types,
//! enabling universal method availability across the object hierarchy.

use super::traits::{BaseArrayOps, SubgraphOps, TableOps};
use groggy::types::AttrValue;
use pyo3::PyResult;

// Implement SubgraphOps for PySubgraph
impl SubgraphOps for crate::ffi::subgraphs::subgraph::PySubgraph {
    fn neighborhood(
        &self,
        _radius: Option<usize>,
    ) -> PyResult<crate::ffi::subgraphs::subgraph::PySubgraph> {
        // Delegate to existing neighborhood method if available, or implement here
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Neighborhood expansion via trait delegation not yet implemented",
        ))
    }

    fn table(&self) -> PyResult<crate::ffi::storage::table::PyNodesTable> {
        // Delegate to existing table conversion
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Table conversion via trait delegation not yet implemented",
        ))
    }

    fn sample(&self, _k: usize) -> PyResult<crate::ffi::subgraphs::subgraph::PySubgraph> {
        // Delegate to existing sample method
        // For now, use placeholder - would call self.sample(k) when available
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Subgraph sampling via trait delegation not yet implemented",
        ))
    }

    fn filter_nodes(&self, _query: &str) -> PyResult<crate::ffi::subgraphs::subgraph::PySubgraph> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Node filtering via trait delegation not yet implemented",
        ))
    }

    fn edges_table(&self) -> PyResult<crate::ffi::storage::table::PyEdgesTable> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges table via trait delegation not yet implemented",
        ))
    }

    fn density(&self) -> PyResult<f64> {
        // Calculate density: number of edges / possible edges
        // For now, placeholder implementation
        Ok(0.5) // Placeholder
    }

    fn is_connected(&self) -> PyResult<bool> {
        // Check if subgraph is connected
        // For now, placeholder implementation
        Ok(true) // Placeholder
    }
}

// Implement TableOps for PyNodesTable
impl TableOps for crate::ffi::storage::table::PyNodesTable {
    fn agg(&self, _spec: &str) -> PyResult<crate::ffi::storage::table::PyBaseTable> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Table aggregation via trait delegation not yet implemented",
        ))
    }

    fn filter(&self, _expr: &str) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Table filtering via trait delegation not yet implemented",
        ))
    }

    fn group_by(&self, _columns: &[&str]) -> PyResult<crate::ffi::storage::table::PyBaseTable> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Table grouping via trait delegation not yet implemented",
        ))
    }

    fn join(&self, _other: &Self, _on: &str) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Table join via trait delegation not yet implemented",
        ))
    }

    fn sort_by(&self, _column: &str, _ascending: bool) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Table sorting via trait delegation not yet implemented",
        ))
    }

    fn select(&self, _columns: &[&str]) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Column selection via trait delegation not yet implemented",
        ))
    }

    fn unique(&self, _column: &str) -> PyResult<Vec<AttrValue>> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Unique values via trait delegation not yet implemented",
        ))
    }

    fn count(&self) -> PyResult<usize> {
        // Get row count - this could delegate to existing __len__ method
        Ok(0) // Placeholder
    }
}

// Implement TableOps for PyEdgesTable
impl TableOps for crate::ffi::storage::table::PyEdgesTable {
    fn agg(&self, _spec: &str) -> PyResult<crate::ffi::storage::table::PyBaseTable> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges table aggregation via trait delegation not yet implemented",
        ))
    }

    fn filter(&self, _expr: &str) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges table filtering via trait delegation not yet implemented",
        ))
    }

    fn group_by(&self, _columns: &[&str]) -> PyResult<crate::ffi::storage::table::PyBaseTable> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges table grouping via trait delegation not yet implemented",
        ))
    }

    fn join(&self, _other: &Self, _on: &str) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges table join via trait delegation not yet implemented",
        ))
    }

    fn sort_by(&self, _column: &str, _ascending: bool) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges table sorting via trait delegation not yet implemented",
        ))
    }

    fn select(&self, _columns: &[&str]) -> PyResult<Self> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges column selection via trait delegation not yet implemented",
        ))
    }

    fn unique(&self, _column: &str) -> PyResult<Vec<AttrValue>> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Edges unique values via trait delegation not yet implemented",
        ))
    }

    fn count(&self) -> PyResult<usize> {
        Ok(0) // Placeholder
    }
}

// Implement GraphOps for PyGraph (if available)
// Note: This would need the actual PyGraph type to be available
/*
impl GraphOps for crate::ffi::api::graph::PyGraph {
    fn connected_components(&self) -> PyResult<crate::ffi::storage::subgraph_array::PySubgraphArray> {
        // Delegate to existing connected_components method
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Connected components via trait delegation not yet implemented"
        ))
    }

    fn shortest_path(&self, from: NodeId, to: NodeId) -> PyResult<Option<crate::ffi::subgraphs::subgraph::PySubgraph>> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "Shortest path via trait delegation not yet implemented"
        ))
    }

    fn bfs(&self, start: NodeId) -> PyResult<crate::ffi::subgraphs::subgraph::PySubgraph> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "BFS via trait delegation not yet implemented"
        ))
    }

    fn dfs(&self, start: NodeId) -> PyResult<crate::ffi::subgraphs::subgraph::PySubgraph> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "DFS via trait delegation not yet implemented"
        ))
    }

    fn pagerank(&self, damping: Option<f64>) -> PyResult<crate::ffi::storage::table::PyNodesTable> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "PageRank via trait delegation not yet implemented"
        ))
    }

    fn minimum_spanning_tree(&self) -> PyResult<crate::ffi::subgraphs::subgraph::PySubgraph> {
        Err(pyo3::exceptions::PyNotImplementedError::new_err(
            "MST via trait delegation not yet implemented"
        ))
    }

    fn clustering_coefficient(&self) -> PyResult<f64> {
        Ok(0.0) // Placeholder
    }
}
*/

// Utility function to demonstrate trait-based method forwarding
pub fn forward_subgraph_operations<T: SubgraphOps>(
    subgraphs: &[T],
    operation: &str,
    _params: &[&str],
) -> Vec<PyResult<()>> {
    let mut results = Vec::new();

    for subgraph in subgraphs {
        let result = match operation {
            "density" => subgraph.density().map(|_| ()),
            "is_connected" => subgraph.is_connected().map(|_| ()),
            _ => Err(pyo3::exceptions::PyNotImplementedError::new_err(format!(
                "Operation '{}' not supported",
                operation
            ))),
        };
        results.push(result);
    }

    results
}

// Utility function to demonstrate trait-based array operations
pub fn forward_array_operations<T: BaseArrayOps>(arrays: &[T]) -> Vec<usize> {
    arrays.iter().map(|arr| arr.len()).collect()
}

// Helper trait for dynamic trait dispatch (experimental)
pub trait DynamicDelegation {
    fn delegate_operation(&self, operation: &str, params: &[&str]) -> PyResult<String>;
}

// Example implementation showing how objects can provide dynamic delegation
impl DynamicDelegation for crate::ffi::subgraphs::subgraph::PySubgraph {
    fn delegate_operation(&self, operation: &str, _params: &[&str]) -> PyResult<String> {
        match operation {
            "density" => {
                let density = self.density()?;
                Ok(format!("density: {:.3}", density))
            }
            "is_connected" => {
                let connected = self.is_connected()?;
                Ok(format!("connected: {}", connected))
            }
            _ => Err(pyo3::exceptions::PyNotImplementedError::new_err(format!(
                "Dynamic operation '{}' not supported",
                operation
            ))),
        }
    }
}
