surtgis 0.6.21

//! Handlers for clip, rasterize, and resample commands.

use std::path::PathBuf;
use std::time::Instant;

use anyhow::{Context, Result};
use ndarray;

use crate::helpers;
use crate::memory;

pub fn handle_clip(
    input: PathBuf,
    polygon: Option<PathBuf>,
    bbox: Option<String>,
    output: PathBuf,
    compress: bool,
    mem_limit_bytes: Option<u64>,
) -> Result<()> {
    if polygon.is_none() && bbox.is_none() {
        anyhow::bail!("Either --polygon or --bbox is required");
    }

    // Validate that DEM doesn't exceed memory limit (clip requires in-memory processing)
    if let Some(limit) = mem_limit_bytes {
        if let Ok(est_size) = memory::estimate_decompressed_size(&input) {
            if est_size > limit {
                eprintln!("Warning: DEM size ({:.2} GB) exceeds --max-memory limit ({:.2} GB)",
                         est_size as f64 / 1e9, limit as f64 / 1e9);
                eprintln!("Note: Clip operation requires in-memory processing and cannot stream");
            }
        }
    }

    let raster = helpers::read_dem(&input)?;
    let start = Instant::now();

    let result = if let Some(polygon_path) = polygon {
        let features = surtgis_core::vector::read_vector(&polygon_path)
            .context("Failed to read vector file")?;
        surtgis_core::vector::clip_raster(&raster, &features)
            .context("Failed to clip raster")?
    } else {
        // Parse bbox: xmin,ymin,xmax,ymax
        let bbox_str = bbox.unwrap();
        let parts: Vec<f64> = bbox_str
            .split(',')
            .map(|s| s.trim().parse::<f64>())
            .collect::<std::result::Result<Vec<_>, _>>()
            .context("Invalid bbox format. Expected: xmin,ymin,xmax,ymax")?;
        if parts.len() != 4 {
            anyhow::bail!("bbox must have exactly 4 values: xmin,ymin,xmax,ymax (got {})", parts.len());
        }
        let (xmin, ymin, xmax, ymax) = (parts[0], parts[1], parts[2], parts[3]);

        // Convert geographic bounds to pixel coordinates
        let (col_min_f, row_max_f) = raster.geo_to_pixel(xmin, ymin);
        let (col_max_f, row_min_f) = raster.geo_to_pixel(xmax, ymax);

        let row_start = (row_min_f.floor() as isize).max(0) as usize;
        let row_end = (row_max_f.ceil() as isize).max(0) as usize;
        let col_start = (col_min_f.floor() as isize).max(0) as usize;
        let col_end = (col_max_f.ceil() as isize).max(0) as usize;

        let (rows, cols) = raster.shape();
        let row_end = row_end.min(rows);
        let col_end = col_end.min(cols);

        if row_start >= row_end || col_start >= col_end {
            anyhow::bail!("Bounding box does not overlap with raster");
        }

        let out_rows = row_end - row_start;
        let out_cols = col_end - col_start;
        let data = raster.data();
        let sub = data.slice(ndarray::s![row_start..row_end, col_start..col_end]);

        let (ox, oy) = raster.pixel_to_geo(col_start, row_start);
        let gt = raster.transform();
        let new_gt = surtgis_core::GeoTransform::new(ox, oy, gt.pixel_width, gt.pixel_height);

        let mut out = surtgis_core::Raster::from_vec(sub.iter().copied().collect(), out_rows, out_cols)?;
        out.set_transform(new_gt);
        out.set_crs(raster.crs().cloned());
        out.set_nodata(raster.nodata());
        out
    };

    let elapsed = start.elapsed();
    helpers::write_result(&result, &output, compress)?;

    let total = result.len();
    let valid = result.data().iter().filter(|v| v.is_finite()).count();
    println!(
        "Clipped: {} x {} ({:.1}% valid cells)",
        result.cols(),
        result.rows(),
        100.0 * valid as f64 / total as f64,
    );

    helpers::done("Clip", &output, elapsed);
    Ok(())
}

pub fn handle_rasterize(
    input: PathBuf,
    output: PathBuf,
    reference: PathBuf,
    attribute: Option<String>,
    compress: bool,
) -> Result<()> {
    let features = surtgis_core::vector::read_vector(&input)
        .context("Failed to read vector file")?;
    let ref_raster = helpers::read_dem(&reference)?;

    let (rows, cols) = ref_raster.shape();
    let start = Instant::now();
    let result = surtgis_core::vector::rasterize_polygons(
        &features,
        ref_raster.transform(),
        rows,
        cols,
        attribute.as_deref(),
    )
    .context("Failed to rasterize")?;
    let elapsed = start.elapsed();

    helpers::write_result(&result, &output, compress)?;
    println!("{} features rasterized", features.len());
    helpers::done("Rasterize", &output, elapsed);
    Ok(())
}

pub fn handle_resample(
    input: PathBuf,
    output: PathBuf,
    reference: PathBuf,
    method: String,
    compress: bool,
) -> Result<()> {
    let method = match method.to_lowercase().as_str() {
        "nearest" | "nn" => surtgis_core::ResampleMethod::NearestNeighbor,
        "bilinear" | "linear" => surtgis_core::ResampleMethod::Bilinear,
        _ => {
            eprintln!("Unknown method '{}', using bilinear", method);
            surtgis_core::ResampleMethod::Bilinear
        }
    };

    let source = helpers::read_dem(&input)?;
    let ref_raster = helpers::read_dem(&reference)?;

    let (src_rows, src_cols) = source.shape();
    let (ref_rows, ref_cols) = ref_raster.shape();

    let start = Instant::now();
    let result = surtgis_core::resample_to_grid(&source, &ref_raster, method)
        .context("Failed to resample")?;
    let elapsed = start.elapsed();

    helpers::write_result(&result, &output, compress)?;
    println!(
        "Resampled: {} x {} → {} x {}",
        src_cols, src_rows, ref_cols, ref_rows
    );
    helpers::done("Resample", &output, elapsed);
    Ok(())
}