/*
This tool is part of the WhiteboxTools geospatial analysis library.
Authors: Dr. John Lindsay
Created: June 14, 2017
Last Modified: 12/10/2018
License: MIT
*/

use whitebox_lidar::*;
use crate::tools::*;
use std::env;
use std::f64;
use std::io::{Error, ErrorKind};
use std::path;

pub struct FindFlightlineEdgePoints {
    name: String,
    description: String,
    toolbox: String,
    parameters: Vec<ToolParameter>,
    example_usage: String,
}

impl FindFlightlineEdgePoints {
    pub fn new() -> FindFlightlineEdgePoints {
        // public constructor
        let name = "FindFlightlineEdgePoints".to_string();
        let toolbox = "LiDAR Tools".to_string();
        let description = "Identifies points along a flightline's edge in a LAS file.".to_string();

        let mut parameters = vec![];
        parameters.push(ToolParameter {
            name: "Input LiDAR 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: "Output File".to_owned(),
            flags: vec!["-o".to_owned(), "--output".to_owned()],
            description: "Output 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=\"input.las\" -o=\"output.las\"",
            short_exe, name
        )
        .replace("*", &sep);

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

impl WhiteboxTool for FindFlightlineEdgePoints {
    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 {
        let mut s = String::from("{\"parameters\": [");
        for i in 0..self.parameters.len() {
            if i < self.parameters.len() - 1 {
                s.push_str(&(self.parameters[i].to_string()));
                s.push_str(",");
            } else {
                s.push_str(&(self.parameters[i].to_string()));
            }
        }
        s.push_str("]}");
        s
    }

    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 = "".to_string();
        let mut output_file: String = "".to_string();

        // read the arguments
        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;
            }
            if vec[0].to_lowercase() == "-i" || vec[0].to_lowercase() == "--input" {
                if keyval {
                    input_file = vec[1].to_string();
                } else {
                    input_file = args[i + 1].to_string();
                }
            } else if vec[0].to_lowercase() == "-o" || vec[0].to_lowercase() == "--output" {
                if keyval {
                    output_file = vec[1].to_string();
                } else {
                    output_file = 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 = path::MAIN_SEPARATOR;
        if !input_file.contains(sep) && !input_file.contains("/") {
            input_file = format!("{}{}", working_directory, input_file);
        }
        if !output_file.contains(sep) && !output_file.contains("/") {
            output_file = format!("{}{}", working_directory, output_file);
        }

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

        let start = Instant::now();

        let num_points: f64 = (input.header.number_of_points - 1) as f64; // used for progress calculation only

        let mut progress: i32;
        let mut old_progress: i32 = -1;

        // now output the data
        let mut output = LasFile::initialize_using_file(&output_file, &input);

        let mut num_output_points = 0;
        for i in 0..input.header.number_of_points as usize {
            if input.get_point_info(i).edge_of_flightline_flag() {
                output.add_point_record(input.get_record(i));
                num_output_points += 1;
            }
            if verbose {
                progress = (100.0_f64 * i as f64 / num_points) as i32;
                if progress != old_progress {
                    println!("Progress: {}%", progress);
                    old_progress = progress;
                }
            }
        }

        let elapsed_time = get_formatted_elapsed_time(start);

        println!("");
        if num_output_points > 0 {
            if verbose {
                println!("Writing output LAS file...");
            }
            let _ = match output.write() {
                Ok(_) => {
                    if verbose {
                        println!("Complete!")
                    }
                }
                Err(e) => println!("error while writing: {:?}", e),
            };
        } else {
            println!("No points were flagged as flightline edge features in the LAS files.");
        }
        if verbose {
            println!(
                "{}",
                &format!("Elapsed Time (excluding I/O): {}", elapsed_time)
            );
        }

        Ok(())
    }
}
