/*
This tool is part of the WhiteboxTools geospatial analysis library.
Authors: Dr. John Lindsay
Created: 25/04/2018
Last Modified: 12/10/2018
License: MIT
*/

use whitebox_common::algorithms;
use whitebox_lidar::*;
use whitebox_common::structures::{BoundingBox, Point2D, Point3D};
use crate::tools::*;
use whitebox_vector::{ShapeType, Shapefile};
use std::env;
use std::io::{Error, ErrorKind};
use std::path;

/// This tool can be used to remove, or erase, all of the LiDAR points in a LAS file (`--input`) contained within
/// one or more vector polygon features. The user must specify the name of the input clip file (--polygons), wich
/// must be a vector of a Polygon base shape type. The clip file may contain multiple polygon features and polygon hole
/// parts will be respected during clipping, i.e. LiDAR points within polygon holes will be remain in the output LAS
/// file.
///
/// Use the `ClipLidarToPolygon` tool to perform the complementary operation of clipping (isolating) points from a LAS file
/// that are contained within a set of polygons, while removing points that lie outside the input polygons.
///
/// # See Also
/// `ClipLidarToPolygon`, `Clip`, `ClipRasterToPolygon`
pub struct ErasePolygonFromLidar {
    name: String,
    description: String,
    toolbox: String,
    parameters: Vec<ToolParameter>,
    example_usage: String,
}

impl ErasePolygonFromLidar {
    /// public constructor
    pub fn new() -> ErasePolygonFromLidar {
        let name = "ErasePolygonFromLidar".to_string();
        let toolbox = "LiDAR Tools".to_string();
        let description =
            "Erases (cuts out) a vector polygon or polygons from a LiDAR point cloud.".to_string();

        let mut parameters = vec![];
        parameters.push(ToolParameter {
            name: "Input File".to_owned(),
            flags: vec!["-i".to_owned(), "--input".to_owned()],
            description: "Input LiDAR file.".to_owned(),
            parameter_type: ParameterType::ExistingFile(ParameterFileType::Lidar),
            default_value: None,
            optional: false,
        });

        parameters.push(ToolParameter {
            name: "Input Vector Polygon File".to_owned(),
            flags: vec!["--polygons".to_owned()],
            description: "Input vector polygons file.".to_owned(),
            parameter_type: ParameterType::ExistingFile(ParameterFileType::Vector(
                VectorGeometryType::Polygon,
            )),
            default_value: None,
            optional: false,
        });

        parameters.push(ToolParameter {
            name: "Output File".to_owned(),
            flags: vec!["-o".to_owned(), "--output".to_owned()],
            description: "Output LiDAR file.".to_owned(),
            parameter_type: ParameterType::NewFile(ParameterFileType::Lidar),
            default_value: None,
            optional: false,
        });

        let sep: String = path::MAIN_SEPARATOR.to_string();
        let p = format!("{}", env::current_dir().unwrap().display());
        let e = format!("{}", env::current_exe().unwrap().display());
        let mut short_exe = e
            .replace(&p, "")
            .replace(".exe", "")
            .replace(".", "")
            .replace(&sep, "");
        if e.contains(".exe") {
            short_exe += ".exe";
        }
        let usage = format!(">>.*{0} -r={1} -v --wd=\"*path*to*data*\" -i='data.las' --polygons='lakes.shp' -o='output.las'", short_exe, name).replace("*", &sep);

        ErasePolygonFromLidar {
            name: name,
            description: description,
            toolbox: toolbox,
            parameters: parameters,
            example_usage: usage,
        }
    }
}

impl WhiteboxTool for ErasePolygonFromLidar {
    fn get_source_file(&self) -> String {
        String::from(file!())
    }

    fn get_tool_name(&self) -> String {
        self.name.clone()
    }

    fn get_tool_description(&self) -> String {
        self.description.clone()
    }

    fn get_tool_parameters(&self) -> String {
        match serde_json::to_string(&self.parameters) {
            Ok(json_str) => return format!("{{\"parameters\":{}}}", json_str),
            Err(err) => return format!("{:?}", err),
        }
    }

    fn get_example_usage(&self) -> String {
        self.example_usage.clone()
    }

    fn get_toolbox(&self) -> String {
        self.toolbox.clone()
    }

    fn run<'a>(
        &self,
        args: Vec<String>,
        working_directory: &'a str,
        verbose: bool,
    ) -> Result<(), Error> {
        let mut input_file = String::new();
        let mut polygons_file = String::new();
        let mut output_file = String::new();

        if args.len() == 0 {
            return Err(Error::new(
                ErrorKind::InvalidInput,
                "Tool run with no parameters.",
            ));
        }
        for i in 0..args.len() {
            let mut arg = args[i].replace("\"", "");
            arg = arg.replace("\'", "");
            let cmd = arg.split("="); // in case an equals sign was used
            let vec = cmd.collect::<Vec<&str>>();
            let mut keyval = false;
            if vec.len() > 1 {
                keyval = true;
            }
            let flag_val = vec[0].to_lowercase().replace("--", "-");
            if flag_val == "-i" || flag_val == "-input" {
                input_file = if keyval {
                    vec[1].to_string()
                } else {
                    args[i + 1].to_string()
                };
            } else if flag_val == "-polygon" || flag_val == "-polygons" {
                polygons_file = if keyval {
                    vec[1].to_string()
                } else {
                    args[i + 1].to_string()
                };
            } else if flag_val == "-o" || flag_val == "-output" {
                output_file = if keyval {
                    vec[1].to_string()
                } else {
                    args[i + 1].to_string()
                };
            }
        }

        if verbose {
            println!("***************{}", "*".repeat(self.get_tool_name().len()));
            println!("* Welcome to {} *", self.get_tool_name());
            println!("***************{}", "*".repeat(self.get_tool_name().len()));
        }

        let sep: String = path::MAIN_SEPARATOR.to_string();

        let mut progress: usize;
        let mut old_progress: usize = 1;

        if !input_file.contains(&sep) && !input_file.contains("/") {
            input_file = format!("{}{}", working_directory, input_file);
        }
        if !polygons_file.contains(&sep) && !polygons_file.contains("/") {
            polygons_file = format!("{}{}", working_directory, polygons_file);
        }
        if !output_file.contains(&sep) && !output_file.contains("/") {
            output_file = format!("{}{}", working_directory, output_file);
        }

        if verbose {
            println!("Reading data...")
        };
        let input = match LasFile::new(&input_file, "r") {
            Ok(lf) => lf,
            Err(err) => panic!("Error reading file {}: {}", input_file, err),
        };

        let polygons = Shapefile::read(&polygons_file)?;
        let num_records = polygons.num_records;

        let start = Instant::now();

        // make sure the input vector file is of points type
        if polygons.header.shape_type.base_shape_type() != ShapeType::Polygon {
            return Err(Error::new(
                ErrorKind::InvalidInput,
                "The input vector data must be of polygon base shape type.",
            ));
        }

        // place the bounding boxes of each of the polygons into a vector
        let mut bb: Vec<BoundingBox> = Vec::with_capacity(num_records);
        for record_num in 0..polygons.num_records {
            let record = polygons.get_record(record_num);
            bb.push(BoundingBox::new(
                record.x_min,
                record.x_max,
                record.y_min,
                record.y_max,
            ));
        }

        let mut output = LasFile::initialize_using_file(&output_file, &input);
        output.header.system_id = "EXTRACTION".to_string();

        let n_points = input.header.number_of_points as usize;
        let num_points: f64 = (input.header.number_of_points - 1) as f64; // used for progress calculation only
        let mut point_in_poly: bool;
        // let mut p: PointData;
        let mut p: Point3D;
        let mut start_point_in_part: usize;
        let mut end_point_in_part: usize;
        for point_num in 0..n_points {
            // p = input.get_point_info(point_num);
            p = input.get_transformed_coords(point_num);
            point_in_poly = false;
            for record_num in 0..polygons.num_records {
                if bb[record_num].is_point_in_box(p.x, p.y) {
                    // it's in the bounding box and worth seeing if it's in the enclosed polygon
                    let record = polygons.get_record(record_num);
                    for part in 0..record.num_parts as usize {
                        if !record.is_hole(part as i32) {
                            // not holes
                            start_point_in_part = record.parts[part] as usize;
                            end_point_in_part = if part < record.num_parts as usize - 1 {
                                record.parts[part + 1] as usize - 1
                            } else {
                                record.num_points as usize - 1
                            };

                            if algorithms::point_in_poly(
                                &Point2D { x: p.x, y: p.y },
                                &record.points[start_point_in_part..end_point_in_part + 1],
                            ) {
                                point_in_poly = true;
                                break;
                            }
                        }
                    }

                    for part in 0..record.num_parts as usize {
                        if record.is_hole(part as i32) {
                            // holes
                            start_point_in_part = record.parts[part] as usize;
                            end_point_in_part = if part < record.num_parts as usize - 1 {
                                record.parts[part + 1] as usize - 1
                            } else {
                                record.num_points as usize - 1
                            };

                            if algorithms::point_in_poly(
                                &Point2D { x: p.x, y: p.y },
                                &record.points[start_point_in_part..end_point_in_part + 1],
                            ) {
                                point_in_poly = false;
                                break;
                            }
                        }
                    }
                }
            }

            if !point_in_poly {
                output.add_point_record(input.get_record(point_num));
            }
            if verbose {
                progress = (100.0_f64 * point_num as f64 / num_points) as usize;
                if progress != old_progress {
                    println!("Progress: {}%", progress);
                    old_progress = progress;
                }
            }
        }

        let elapsed_time = get_formatted_elapsed_time(start);

        if verbose {
            println!("Writing output LAS file...");
        }
        let _ = match output.write() {
            Ok(_) => {
                if verbose {
                    println!("Complete!")
                }
            }
            Err(e) => println!("error while writing: {:?}", e),
        };
        if verbose {
            println!(
                "{}",
                &format!("Elapsed Time (excluding I/O): {}", elapsed_time)
            );
        }

        Ok(())
    }
}
