oxigdal-node 0.1.4

//! Async operations for Node.js bindings
//!
//! This module provides Promise-based async operations for I/O and processing.

use napi::bindgen_prelude::*;
use napi::tokio;
use napi_derive::napi;
use std::path::Path;

use crate::buffer::BufferWrapper;
use crate::error::NodeError;
use crate::raster::Dataset;
use crate::vector::FeatureCollection;

/// Opens a raster dataset asynchronously
#[allow(dead_code)]
#[napi]
pub async fn open_raster_async(path: String) -> Result<Dataset> {
    tokio::task::spawn_blocking(move || Dataset::open(path))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Saves a dataset asynchronously
#[allow(dead_code)]
#[napi]
pub async fn save_raster_async(dataset: &Dataset, path: String) -> Result<()> {
    let ds_clone = dataset.clone();
    tokio::task::spawn_blocking(move || ds_clone.save(path))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Reads a GeoJSON file asynchronously
#[allow(dead_code)]
#[napi]
pub async fn read_geojson_async(path: String) -> Result<FeatureCollection> {
    tokio::task::spawn_blocking(move || {
        let content = std::fs::read_to_string(&path).map_err(|e| NodeError {
            code: "IO_ERROR".to_string(),
            message: format!("Failed to read file: {}", e),
        })?;
        FeatureCollection::from_geojson(content)
    })
    .await
    .map_err(|e| NodeError {
        code: "TASK_ERROR".to_string(),
        message: format!("Task execution failed: {}", e),
    })?
}

/// Writes a GeoJSON file asynchronously
#[allow(dead_code)]
#[napi]
pub async fn write_geojson_async(path: String, collection: &FeatureCollection) -> Result<()> {
    let content = collection.to_geojson()?;
    tokio::task::spawn_blocking(move || {
        std::fs::write(&path, content).map_err(|e| {
            NodeError {
                code: "IO_ERROR".to_string(),
                message: format!("Failed to write file: {}", e),
            }
            .into()
        })
    })
    .await
    .map_err(|e| NodeError {
        code: "TASK_ERROR".to_string(),
        message: format!("Task execution failed: {}", e),
    })?
}

/// Resamples a buffer asynchronously
#[allow(dead_code)]
#[napi]
pub async fn resample_async(
    buffer: &BufferWrapper,
    new_width: u32,
    new_height: u32,
    method: crate::algorithms::ResamplingMethod,
) -> Result<BufferWrapper> {
    let buffer_clone = buffer.clone();
    tokio::task::spawn_blocking(move || {
        crate::algorithms::resample(&buffer_clone, new_width, new_height, method)
    })
    .await
    .map_err(|e| NodeError {
        code: "TASK_ERROR".to_string(),
        message: format!("Task execution failed: {}", e),
    })?
}

/// Computes hillshade asynchronously
#[allow(dead_code)]
#[napi]
pub async fn hillshade_async(
    dem: &BufferWrapper,
    azimuth: f64,
    altitude: f64,
    z_factor: f64,
) -> Result<BufferWrapper> {
    let dem_clone = dem.clone();
    tokio::task::spawn_blocking(move || {
        crate::algorithms::hillshade(&dem_clone, azimuth, altitude, z_factor)
    })
    .await
    .map_err(|e| NodeError {
        code: "TASK_ERROR".to_string(),
        message: format!("Task execution failed: {}", e),
    })?
}

/// Computes slope asynchronously
#[allow(dead_code)]
#[napi]
pub async fn slope_async(
    dem: &BufferWrapper,
    z_factor: f64,
    as_percent: bool,
) -> Result<BufferWrapper> {
    let dem_clone = dem.clone();
    tokio::task::spawn_blocking(move || crate::algorithms::slope(&dem_clone, z_factor, as_percent))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Computes aspect asynchronously
#[allow(dead_code)]
#[napi]
pub async fn aspect_async(dem: &BufferWrapper) -> Result<BufferWrapper> {
    let dem_clone = dem.clone();
    tokio::task::spawn_blocking(move || crate::algorithms::aspect(&dem_clone))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Computes zonal statistics asynchronously
#[allow(dead_code)]
#[napi]
pub async fn zonal_stats_async(
    raster: &BufferWrapper,
    zones: &BufferWrapper,
) -> Result<Vec<crate::algorithms::ZonalStatistics>> {
    let raster_clone = raster.clone();
    let zones_clone = zones.clone();
    tokio::task::spawn_blocking(move || crate::algorithms::zonal_stats(&raster_clone, &zones_clone))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Buffer operation asynchronously
#[allow(dead_code)]
#[napi]
pub async fn buffer_async(
    geometry: &crate::vector::GeometryWrapper,
    distance: f64,
    segments: u32,
) -> Result<crate::vector::GeometryWrapper> {
    let geom_clone = geometry.clone();
    tokio::task::spawn_blocking(move || crate::algorithms::buffer(&geom_clone, distance, segments))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Area calculation asynchronously
#[allow(dead_code)]
#[napi]
pub async fn area_async(geometry: &crate::vector::GeometryWrapper, method: String) -> Result<f64> {
    let geom_clone = geometry.clone();
    tokio::task::spawn_blocking(move || crate::algorithms::area(&geom_clone, method))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Simplify operation asynchronously
#[allow(dead_code)]
#[napi]
pub async fn simplify_async(
    geometry: &crate::vector::GeometryWrapper,
    tolerance: f64,
    method: String,
) -> Result<crate::vector::GeometryWrapper> {
    let geom_clone = geometry.clone();
    tokio::task::spawn_blocking(move || crate::algorithms::simplify(&geom_clone, tolerance, method))
        .await
        .map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })?
}

/// Batch processes multiple rasters asynchronously
#[allow(dead_code)]
#[napi]
pub async fn batch_process_rasters(
    paths: Vec<String>,
    output_dir: String,
    operation: String,
) -> Result<Vec<String>> {
    let mut tasks = Vec::new();

    for path in paths {
        let output_path = format!(
            "{}/processed_{}",
            output_dir,
            Path::new(&path)
                .file_name()
                .and_then(|n| n.to_str())
                .unwrap_or("output.tif")
        );
        let op = operation.clone();

        let task = tokio::task::spawn_blocking(move || -> Result<String> {
            let dataset = Dataset::open(path)?;

            // Apply operation based on string
            let processed = match op.as_str() {
                "identity" => dataset,
                _ => {
                    return Err(NodeError {
                        code: "INVALID_OPERATION".to_string(),
                        message: format!("Unknown operation: {}", op),
                    }
                    .into());
                }
            };

            processed.save(output_path.clone())?;
            Ok(output_path)
        });

        tasks.push(task);
    }

    let mut results = Vec::new();
    for task in tasks {
        let result = task.await.map_err(|e| NodeError {
            code: "TASK_ERROR".to_string(),
            message: format!("Task execution failed: {}", e),
        })??;
        results.push(result);
    }

    Ok(results)
}

/// Progress callback for long-running operations
#[allow(dead_code)]
#[napi(ts_args_type = "callback: (progress: number) => void")]
pub fn set_progress_callback(_callback: Function<'_, Unknown<'_>>) -> Result<()> {
    // Store callback for use in long-running operations
    // This is a placeholder for actual implementation
    Ok(())
}

/// Cancellation token for async operations
#[napi]
pub struct CancellationToken {
    cancelled: std::sync::Arc<std::sync::atomic::AtomicBool>,
}

#[napi]
impl CancellationToken {
    /// Creates a new cancellation token
    #[napi(constructor)]
    pub fn new() -> Self {
        Self {
            cancelled: std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false)),
        }
    }

    /// Cancels the operation
    #[napi]
    pub fn cancel(&self) {
        self.cancelled
            .store(true, std::sync::atomic::Ordering::SeqCst);
    }

    /// Checks if cancelled
    #[napi]
    pub fn is_cancelled(&self) -> bool {
        self.cancelled.load(std::sync::atomic::Ordering::SeqCst)
    }

    /// Resets the token
    #[napi]
    pub fn reset(&self) {
        self.cancelled
            .store(false, std::sync::atomic::Ordering::SeqCst);
    }
}

/// Parallel processing configuration
#[allow(dead_code)]
#[napi(object)]
pub struct ParallelConfig {
    /// Number of threads to use (0 = automatic)
    pub num_threads: u32,
    /// Chunk size for parallel processing
    pub chunk_size: u32,
    /// Enable progress reporting
    pub report_progress: bool,
}

impl Default for ParallelConfig {
    fn default() -> Self {
        Self {
            num_threads: 0,
            chunk_size: 1000,
            report_progress: false,
        }
    }
}

/// Processes a large raster in parallel chunks
#[allow(dead_code)]
#[napi]
pub async fn process_raster_parallel(
    dataset: &Dataset,
    operation: String,
    config: Option<ParallelConfig>,
) -> Result<Dataset> {
    let _cfg = config.unwrap_or_default();
    let ds_clone = dataset.clone();

    tokio::task::spawn_blocking(move || -> Result<Dataset> {
        // This is a simplified implementation
        // In production, would process tiles in parallel
        match operation.as_str() {
            "identity" => Ok(ds_clone),
            _ => Err(NodeError {
                code: "INVALID_OPERATION".to_string(),
                message: format!("Unknown operation: {}", operation),
            }
            .into()),
        }
    })
    .await
    .map_err(|e| NodeError {
        code: "TASK_ERROR".to_string(),
        message: format!("Task execution failed: {}", e),
    })?
}

/// Stream processing for large datasets
#[napi]
pub struct RasterStream {
    dataset: Dataset,
    current_row: u32,
    chunk_height: u32,
}

#[napi]
impl RasterStream {
    /// Creates a new raster stream
    #[napi(constructor)]
    pub fn new(dataset: &Dataset, chunk_height: u32) -> Self {
        Self {
            dataset: dataset.clone(),
            current_row: 0,
            chunk_height,
        }
    }

    /// Reads the next chunk
    #[napi]
    pub async unsafe fn read_next_chunk(&mut self) -> Result<Option<BufferWrapper>> {
        if self.current_row >= self.dataset.height() {
            return Ok(None);
        }

        let height = self
            .chunk_height
            .min(self.dataset.height() - self.current_row);
        let chunk =
            self.dataset
                .read_window(0, 0, self.current_row, self.dataset.width(), height)?;

        self.current_row += height;
        Ok(Some(chunk))
    }

    /// Resets the stream to the beginning
    #[napi]
    pub unsafe fn reset(&mut self) {
        self.current_row = 0;
    }

    /// Gets current progress (0.0 - 1.0)
    #[napi]
    pub fn progress(&self) -> f64 {
        if self.dataset.height() == 0 {
            1.0
        } else {
            self.current_row as f64 / self.dataset.height() as f64
        }
    }
}