//! The `data_sample_parser` module provides functionality to read sample data, parse and analyze it,
//! so that test data can be generated based on profiles.
//!
//! # Examples
//!
//!
//! Generate some demo test data ...
//!
//! ```
//! extern crate test_data_generation;
//!
//! use test_data_generation::data_sample_parser::DataSampleParser;
//!
//! fn main() {
//!		// initalize a new DataSampelParser
//!		let dsp = DataSampleParser::new();
//!
//!		// generate some test data using the demo functions
//!		println!("generate date:{}", dsp.demo_date());
//!		println!("generate person:{}", dsp.demo_person_name());
//! }
//! ```
//!
//! Save the algorithm ...
//!
//! Archive (export) the data sample parser object so that you can reuse the algorithm to generate test data at a later time.
//! This enables you to persist the algorithm without having to store the actual data sample that was used to create the algorithm -
//! Which is important if you used 'real' data in your sample data.
//!
//! ```
//! extern crate test_data_generation;
//!
//! use test_data_generation::data_sample_parser::DataSampleParser;
//!
//! fn main() {
//! 	// analyze the dataset
//!		let mut dsp =  DataSampleParser::new();
//!
//!     assert_eq!(dsp.save(&String::from("./tests/samples/empty-dsp")).unwrap(), true);
//! }
//! ```
//!
//! Load an algorithm ...
//!
//! Create a data sample parser from a previously saved (exported) archive file so you can generate test data based on the algorithm.</br>
//! *NOTE:* In this example, there was only one data point in the data sample that was analyzed (the word 'OK'). This was intentional
//! so the algorithm would be guaranteed to generate that same word. This was done ensure the assert_eq! returns true.
//!
//! ```
//! extern crate test_data_generation;
//!
//! use test_data_generation::data_sample_parser::DataSampleParser;
//!
//! fn main() {
//!		let mut dsp = DataSampleParser::from_file(&String::from("./tests/samples/sample-00-dsp"));
//!
//!		assert_eq!(dsp.generate_record()[0], "OK".to_string());
//! }
//! ```
//!
//! You can also generate a new csv file based on the data sample provided.
//!
//! ```
//! extern crate test_data_generation;
//!
//! use test_data_generation::data_sample_parser::DataSampleParser;
//!
//! fn main() {
//!     let mut dsp =  DataSampleParser::new();
//!
//!     // Using the default delimiter (comma)
//!    	dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None).unwrap();
//!    	dsp.generate_csv(100, &String::from("./tests/samples/generated-01.csv"), None).unwrap();
//! }
//! ```
//!

// use std::collections::BTreeMap;
use crate::configs::Configs;
use crate::engine::{Engine, EngineContainer};
use crate::shared::CsvManipulator;
use crate::Profile;
use csv;
use indexmap::IndexMap;
use std::fs::File;
use std::io;
use std::io::prelude::*;
use std::io::Write;
use std::result::Result;
//use csv::StringRecord;
use csv::WriterBuilder;
use serde_json;
use serde_json::Value;
use std::error::Error;

use std::sync::mpsc;
use std::sync::mpsc::{Receiver, Sender};
use std::thread;

const DELIMITER: u8 = b',';

type ProfilesMap = IndexMap<String, Profile>;

#[derive(Serialize, Deserialize, Debug)]
/// Represents the Parser for sample data to be used
pub struct DataSampleParser {
    /// indicates if there were issues parsing and anlyzing the data sample
    pub issues: bool,
    /// Configs object that define the configuration settings
    cfg: Option<Configs>,
    /// List of Profiles objects identified by a unique profile name LinkedHashMap<String, Profile>
    #[serde(with = "indexmap::serde_seq")]
    profiles: ProfilesMap,
}

impl CsvManipulator for DataSampleParser {}
impl Engine for DataSampleParser {}

impl DataSampleParser {
    /// Constructs a new DataSampleParser
    ///
    /// #Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let dsp = DataSampleParser::new();
    /// }
    /// ```
    pub fn new() -> DataSampleParser {
        DataSampleParser {
            issues: false,
            cfg: None,
            profiles: ProfilesMap::new(),
        }
    }

    /// Constructs a new DataSampleParser
    ///
    /// # Arguments
    ///
    /// * `path: &String - The full path name (including the file name and extension) to the configuration file.</br>
    ///
    /// #Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///	    // param: the path to the configuration  file
    ///		let dsp = DataSampleParser::new_with(&String::from("./config/tdg.yaml"));
    /// }
    /// ```
    pub fn new_with(path: &String) -> DataSampleParser {
        DataSampleParser {
            issues: false,
            cfg: Some(Configs::new(path)),
            profiles: ProfilesMap::new(),
        }
    }

    /// Constructs a new DataSampleParser from an exported JSON file. This is used when restoring from "archive"
    ///
    /// # Arguments
    ///
    /// * `path: &String` - The full path name of the json formatted Data Sample Parser archive file.</br>
    ///
    /// #Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		let mut dsp = DataSampleParser::from_file(&String::from("./tests/samples/sample-00-dsp"));
    ///
    ///		assert_eq!(dsp.generate_record()[0], "OK".to_string());
    /// }
    /// ```
    pub fn from_file(path: &String) -> DataSampleParser {
        // open the archive file
        let mut file = match File::open(format!("{}.json", &path)) {
            Err(_e) => {
                error!("Could not open file {:?}", &path.to_string());
                panic!("Could not open file {:?}", &path.to_string());
            }
            Ok(f) => {
                info!("Successfully opened file {:?}", &path.to_string());
                f
            }
        };

        //read the archive file
        let mut serialized = String::new();
        match file.read_to_string(&mut serialized) {
            Err(e) => {
                error!(
                    "Could not read file {:?} because of {:?}",
                    &path.to_string(),
                    e.to_string()
                );
                panic!(
                    "Could not read file {:?} because of {:?}",
                    &path.to_string(),
                    e.to_string()
                );
            }
            Ok(s) => {
                info!("Successfully read file {:?}", &path.to_string());
                s
            }
        };

        // Support backwards compatibility for DSP saved using prior versions
        let dsp: Value = serde_json::from_str(&serialized).unwrap();
        let prfils = dsp.get("profiles").unwrap();

        match prfils.is_array() {
            true => {
                debug!("Version 0.3.0 detected. Using latest version");
                return serde_json::from_str(&serialized).unwrap();
            }
            false => {
                info!("Prior version 0.2.1 detected. Trying to upgrade to latest version");

                return Self::upgrade_to_latest_version(serialized);
            }
        }
    }

    fn upgrade_to_latest_version(serialized: String) -> DataSampleParser {
        let dsp: Value = serde_json::from_str(&serialized).unwrap();
        let prfils = dsp.get("profiles").unwrap();
        let mut pm: ProfilesMap = ProfilesMap::new();
        let issues = dsp.get("issues").unwrap().as_bool().unwrap();

        for prf in prfils.as_object().iter() {
            for attr in prf.keys() {
                let id = prf
                    .get(attr)
                    .unwrap()
                    .as_object()
                    .unwrap()
                    .get("id")
                    .unwrap()
                    .as_str()
                    .unwrap()
                    .to_string();
                let serl = &serde_json::to_string(prf.get(attr).unwrap()).unwrap();
                println!("{:?} : {:?}", id, serl);
                pm.insert(id, Profile::from_serialized(serl));
            }
        }

        let mut rtn = match dsp.get("cfg").unwrap() {
            serde_json::Value::Null => DataSampleParser::new(),
            _ => DataSampleParser::new_with(
                &dsp.get("cfg")
                    .unwrap()
                    .as_object()
                    .unwrap()
                    .get("file")
                    .unwrap()
                    .as_str()
                    .unwrap()
                    .to_string(),
            ),
        };

        rtn.issues = issues;
        rtn.profiles = pm;
        return rtn;
    }

    #[inline]
    fn analyze_columns(&mut self, profile_keys: Vec<String>, columns: Vec<Vec<String>>) {
        let col_cnt = columns.len();
        let (tx, rx): (
            Sender<Result<Profile, String>>,
            Receiver<Result<Profile, String>>,
        ) = mpsc::channel();
        let mut jobs = Vec::new();

        //iterate through all the columns
        for (idx, column) in columns.iter().enumerate() {
            let thread_tx = tx.clone();
            let container = EngineContainer {
                profile: self.profiles.get(&profile_keys[idx]).unwrap().clone(),
                entities: column.to_vec(),
            };

            let job = thread::spawn(move || {
                let result = Self::profile_entities_with_container(container);
                thread_tx.send(result).unwrap();
            });

            jobs.push(job);
        }

        let mut results = Vec::with_capacity(col_cnt);
        for _ in 0..col_cnt {
            results.push(rx.recv());
        }

        for job in jobs {
            job.join().expect("Error: Could not run the job");
        }

        for result in results {
            match result {
                Ok(msg) => {
                    //received from sender
                    match msg {
                        Ok(p) => {
                            let id = p.clone().id.unwrap();
                            debug!("Profile {} has finished analyzing the entities.", id);
                            self.profiles.insert(id, p);
                        }
                        Err(e) => {
                            error!(
                                "Profile wasn't able to analyzing the entities. Error: {}",
                                e
                            );
                        }
                    }
                }
                Err(e) => {
                    // could not receive from sender
                    error!("Receiver wasn't able to receive message from sender which was analyzing entities for the profile. Error: {}", e);
                    panic!("Receiver wasn't able to receive message from sender which was analyzing entities for the profile. Error: {}", e);
                }
            }
        }
        // Multi-Threading END
    }

    /// This function analyzes sample data that is a csv formatted string and returns a boolean if successful.
    /// _NOTE:_ The csv properties are as follows:
    ///       + headers are included as first line
    ///       + double quote wrap text
    ///       + double quote escapes is enabled
    ///       + delimiter is a comma
    ///
    ///
    /// # Arguments
    ///
    /// * `data: &String` - The textual content of a csv formatted sample data file.</br>
    /// * `delimiter: Option<u8>` - The delimiter to use, otherwise use the default.</br>
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let mut dsp = DataSampleParser::new();
    ///		let mut data = String::from("");
    ///		data.push_str("\"firstname\",\"lastname\"\n");
    ///		data.push_str("\"Aaron\",\"Aaberg\"\n");
    ///		data.push_str("\"Aaron\",\"Aaby\"\n");
    ///		data.push_str("\"Abbey\",\"Aadland\"\n");
    ///		data.push_str("\"Abbie\",\"Aagaard\"\n");
    ///		data.push_str("\"Abby\",\"Aakre\"");
    ///
    ///     // Use the default delimiter (comma)
    /// 	assert_eq!(dsp.analyze_csv_data(&data, None).unwrap(),1);
    /// }
    /// ```
    pub fn analyze_csv_data(
        &mut self,
        data: &String,
        delimiter: Option<u8>,
    ) -> Result<i32, String> {
        debug!("Starting to analyzed the csv data {}", data);

        let mut rdr = csv::ReaderBuilder::new()
            .has_headers(true)
            .quote(b'"')
            .double_quote(true)
            .delimiter(Self::else_default_delimiter(delimiter))
            .from_reader(data.as_bytes());

        //iterate through the headers
        for headers in rdr.headers() {
            for header in headers.iter() {
                //add a Profile to the list of profiles to represent the field (indexed using the header label)
                let p = Profile::new_with_id(header.to_string());
                self.profiles.insert(header.to_string(), p);
            }
        }

        //create a Vec from all the keys (headers) in the profiles list
        let profile_keys: Vec<_> = self.profiles.keys().cloned().collect();

        debug!("CSV headers: {:?}", profile_keys);

        // Multi-Threading START
        let columns = Self::read_as_columns(rdr);
        //let col_cnt = columns.len();
        let rec_cnt = columns[0].len();
        self.analyze_columns(profile_keys, columns);

        debug!("Successfully analyzed the csv data");
        debug!(
            "Analyzed {} records, {} fields",
            rec_cnt,
            self.profiles.len()
        );

        //prepare the profiles for data generation
        self.profiles.iter_mut().for_each(|p| p.1.pre_generate());

        Ok(1)
    }

    /// This function analyzes sample data that is a csv formatted file and returns a boolean if successful.
    /// _NOTE:_ The csv properties are as follows:
    ///       + headers are included as first line
    ///       + double quote wrap text
    ///       + double quote escapes is enabled
    ///       + delimiter is a comma
    ///
    ///
    /// # Arguments
    ///
    /// * `path: &String` - The full path name of the csv formatted sample data file.</br>
    /// * `delimiter: Option<u8>` - The delimiter to use, otherwise use the default.</br>
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let mut dsp = DataSampleParser::new();
    ///
    ///     // Use the default delimiter (comma)
    /// 	assert_eq!(dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None).unwrap(),1);
    /// }
    /// ```
    pub fn analyze_csv_file(
        &mut self,
        path: &String,
        delimiter: Option<u8>,
    ) -> Result<i32, String> {
        info!("Starting to analyzed the csv file {}", path);

        let mut file = (File::open(path).map_err(|e| {
            error!("csv file {} couldn't be opened!", path);
            e.to_string()
        }))?;

        let mut data = String::new();
        file.read_to_string(&mut data)
            .map_err(|e| {
                error!("csv file {} couldn't be read!", path);
                e.to_string()
            })
            .unwrap();

        self.analyze_csv_data(&data, delimiter)
    }

    /// This function generates date as strings using the a `demo` profile
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let dsp = DataSampleParser::new();
    ///
    ///		// generate some test data using the demo functions
    ///		println!("generate date:{}", dsp.demo_date());
    /// }
    /// ```
    pub fn demo_date(&self) -> String {
        let mut profil = Profile::new();

        profil.analyze("01/04/2017");
        profil.analyze("02/09/2017");
        profil.analyze("03/13/2017");
        profil.analyze("04/17/2017");
        profil.analyze("05/22/2017");
        profil.analyze("07/26/2017");
        profil.analyze("08/30/2017");
        profil.analyze("09/07/2017");
        profil.analyze("10/11/2017");
        profil.analyze("11/15/2017");
        profil.analyze("12/21/2017");
        profil.analyze("01/14/2016");
        profil.analyze("02/19/2016");
        profil.analyze("03/23/2016");
        profil.analyze("04/27/2016");
        profil.analyze("05/02/2016");
        profil.analyze("07/16/2015");
        profil.analyze("08/20/2015");
        profil.analyze("09/17/2015");
        profil.analyze("10/01/2014");
        profil.analyze("11/25/2014");
        profil.analyze("12/31/2018");

        profil.pre_generate();
        //profil.apply_facts("##p##p####".to_string())
        profil.generate()
    }

    /// This function generates people's names as strings using the a `demo` profile
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let dsp = DataSampleParser::new();
    ///
    ///		// generate some test data using the demo functions
    ///		println!("generate date:{}", dsp.demo_person_name());
    /// }
    pub fn demo_person_name(&self) -> String {
        let mut profil = Profile::new();

        profil.analyze("Smith, John");
        profil.analyze("O'Brien, Henny");
        profil.analyze("Dale, Danny");
        profil.analyze("Rickets, Ronnae");
        profil.analyze("Richard, Richie");
        profil.analyze("Roberts, Blake");
        profil.analyze("Conways, Sephen");

        profil.pre_generate();
        profil.generate()
    }

    fn else_default_delimiter(delimiter: Option<u8>) -> u8 {
        match delimiter {
            Some(d) => {
                return d;
            }
            None => {
                return DELIMITER;
            }
        }
    }

    /// This function returns a vector of header names
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let mut dsp = DataSampleParser::new();
    ///
    /// 	dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None).unwrap();
    ///     let headers = dsp.extract_headers();
    ///
    ///		assert_eq!(headers.len(), 2);
    /// }
    pub fn extract_headers(&mut self) -> Vec<String> {
        let mut headers = vec![];

        for profile in self.profiles.iter_mut() {
            headers.push(profile.0.to_string());
        }

        headers
    }

    /// This function generates test data for the specified field name.
    ///
    /// # Arguments
    ///
    /// * `field: String` - The name of the field (e.g.: firstname) the represents the profile to use when generating the test data.</br>
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let mut dsp = DataSampleParser::new();
    ///
    /// 	dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None).unwrap();
    ///     println!("Generated data for first name {}",dsp.generate_by_field_name("firstname".to_string()));
    /// }
    /// ```
    pub fn generate_by_field_name(&mut self, field: String) -> String {
        self.profiles
            .get_mut(&field)
            .unwrap()
            .generate()
            .to_string()
    }

    /// This function Vec of generates test data fields.
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let mut dsp = DataSampleParser::new();
    ///
    /// 	dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None).unwrap();
    ///     println!("Generated data record: {:?}",dsp.generate_record());
    /// }
    /// ```
    pub fn generate_record(&mut self) -> Vec<String> {
        let mut record = Vec::new();

        for profile in self.profiles.iter_mut() {
            record.push(profile.1.generate().to_string());
        }

        record
    }

    /// This function creates a csv file of generated test data.
    /// Prior to calling this funciton, you need to call the analyze_csv_file() function.
    /// _NOTE:_ The csv properties are as follows:
    ///       + headers are included as first line
    ///       + double quotes wrap text
    ///       + double quote escapes is enabled
    ///       + delimiter is a comma
    ///
    ///
    /// # Arguments
    ///
    /// * `row_count: u32` - The number of rows to generate.</br>
    /// * `path: &String` - The full path name where to save the csv file.</br>
    /// * `delimiter: Option<u8>` - The delimiter to use, otherwise use the default.</br>
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///		let mut dsp = DataSampleParser::new();
    ///
    /// 	dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None).unwrap();
    ///     dsp.generate_csv(100, &String::from("./tests/samples/generated-01.csv"), None).unwrap();
    /// }
    /// ```
    pub fn generate_csv(
        &mut self,
        row_count: u32,
        path: &String,
        delimiter: Option<u8>,
    ) -> Result<(), Box<dyn Error>> {
        info!("generating csv file {}", path);

        let mut wtr = (WriterBuilder::new()
            .has_headers(true)
            .quote(b'"')
            .double_quote(true)
            .delimiter(Self::else_default_delimiter(delimiter))
            .from_path(path)
            .map_err(|e| {
                error!("csv file {} couldn't be created!", path);
                e.to_string()
            }))?;

        let headers = self.extract_headers();
        wtr.write_record(&headers)?;

        for _r in 0..row_count {
            let mut record = Vec::new();

            for profile in self.profiles.iter_mut() {
                record.push(profile.1.generate());
            }

            wtr.write_record(&record)?;
        }

        wtr.flush()?;

        Ok(())
    }

    /// This function calculates the levenshtein distance between 2 strings.
    /// See: https://crates.io/crates/levenshtein
    ///
    /// # Arguments
    ///
    /// * `control: &String` - The string to compare against. This would be the real data from the data sample.</br>
    /// * `experiment: &String` - The string to compare. This would be the generated data for which you want to find the distance.</br>
    ///
    /// #Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    /// 	// analyze the dataset
    ///		let mut dsp =  DataSampleParser::new();
    ///
    ///     assert_eq!(dsp.levenshtein_distance(&"kitten".to_string(), &"sitting".to_string()), 3 as usize);
    /// }
    ///
    pub fn levenshtein_distance(&mut self, control: &String, experiment: &String) -> usize {
        // https://docs.rs/levenshtein/1.0.3/levenshtein/fn.levenshtein.html
        levenshtein_distance!(control, experiment)
    }

    /// This function calculates the percent difference between 2 strings.
    ///
    /// # Arguments
    ///
    /// * `control: &String` - The string to compare against. This would be the real data from the data sample.</br>
    /// * `experiment: &String` - The string to compare. This would be the generated data for which you want to find the percent difference.</br>
    ///
    /// #Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    /// 	// analyze the dataset
    ///		let mut dsp =  DataSampleParser::new();
    ///
    ///     assert_eq!(dsp.realistic_test(&"kitten".to_string(), &"sitting".to_string()), 76.92307692307692 as f64);
    /// }
    ///
    pub fn realistic_test(&mut self, control: &String, experiment: &String) -> f64 {
        //https://docs.rs/GSL/0.4.31/rgsl/statistics/fn.correlation.html
        //http://www.statisticshowto.com/probability-and-statistics/correlation-coefficient-formula/
        // pearson's chi square test
        // cosine similarity - http://blog.christianperone.com/2013/09/machine-learning-cosine-similarity-for-vector-space-models-part-iii/
        realistic_test!(control, experiment)
    }

    /// This function returns a boolean that indicates if the data sample parsing had issues
    ///
    /// # Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    ///		// initalize a new DataSampelParser
    ///	    // param: the path to the configuration file is wrong
    ///		let dsp = DataSampleParser::new_with(&String::from("./target/debug/config/tdg.yaml"));
    ///
    ///		// generate some test data using the demo functions
    ///		assert_eq!(dsp.running_with_issues(), &false);
    /// }
    pub fn running_with_issues(&self) -> &bool {
        &self.issues
    }

    /// This function saves (exports) the DataSampleParser to a JSON file.
    /// This is useful when you wish to reuse the algorithm to generate more test data later.
    ///
    /// # Arguments
    ///
    /// * `field: &String` - The full path of the export file , excluding the file extension, (e.g.: "./test/data/custom-names").</br>
    ///
    /// #Errors
    /// If this function encounters any form of I/O or other error, an error variant will be returned.
    /// Otherwise, the function returns Ok(true).</br>
    ///
    /// #Example
    ///
    /// ```
    /// extern crate test_data_generation;
    ///
    /// use test_data_generation::data_sample_parser::DataSampleParser;
    ///
    /// fn main() {
    /// 	// analyze the dataset
    ///		let mut dsp =  DataSampleParser::new();
    ///     dsp.analyze_csv_file(&String::from("./tests/samples/sample-00.csv"), None).unwrap();
    ///
    ///     assert_eq!(dsp.save(&String::from("./tests/samples/sample-00-dsp")).unwrap(), true);
    /// }
    ///
    pub fn save(&mut self, path: &String) -> Result<bool, io::Error> {
        let dsp_json = serde_json::to_string(&self).unwrap();

        // Create the archive file
        let mut file = match File::create(format!("{}.json", &path)) {
            Err(e) => {
                error!("Could not create file {:?}", &path.to_string());
                return Err(e);
            }
            Ok(f) => {
                info!("Successfully exported to {:?}", &path.to_string());
                f
            }
        };

        // Write the json string to file, returns io::Result<()>
        match file.write_all(dsp_json.as_bytes()) {
            Err(e) => {
                error!("Could not write to file {}", &path.to_string());
                return Err(e);
            }
            Ok(_) => {
                info!("Successfully exported to {}", &path.to_string());
            }
        };

        Ok(true)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs::File;
    use std::io::BufReader;

    #[test]
    // ensure a new Data Sample Parser can be created
    fn test_new() {
        let _dsp = DataSampleParser::new();

        assert!(true);
    }

    #[test]
    // ensure a new Data Sample Parser can be created with configurations
    fn test_new_with() {
        let _dsp = DataSampleParser::new_with(&String::from("./config/tdg.yaml"));

        assert!(true);
    }

    #[test]
    // ensure the Data Sample Parser can be restored from archived file
    fn test_from_file() {
        let mut dsp = DataSampleParser::from_file(&String::from("./tests/samples/sample-00-dsp"));
        println!("Sample data is [{:?}]", dsp.generate_record()[0]);

        assert_eq!(dsp.generate_record()[0], "OK".to_string());
    }

    #[test]
    // ensure the Data Sample Parser can be restored from archived file that
    // was saved using version 0.2.1 using a configuration
    fn test_from_file_v021_with_cfg() {
        let mut dsp =
            DataSampleParser::from_file(&String::from("./tests/samples/sample-0.2.1-dsp"));
        println!("Sample data is [{:?}]", dsp.generate_record()[0]);

        assert_eq!(dsp.generate_record()[0], "OK".to_string());
    }

    #[test]
    // ensure the Data Sample Parser can be restored from archived file that
    // was saved using version 0.2.1 without a configuration
    fn test_from_file_v021_no_cfg() {
        let mut dsp =
            DataSampleParser::from_file(&String::from("./tests/samples/sample-0.2.1-nocfg-dsp"));
        println!("Sample data is [{:?}]", dsp.generate_record()[0]);

        assert_eq!(dsp.generate_record()[0], "OK".to_string());
    }

    #[test]
    // ensure the Data Sample Parser can read all the headers from teh csv file
    fn test_read_headers() {
        let mut dsp = DataSampleParser::new();

        dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
            .unwrap();
        let headers = dsp.extract_headers();

        assert_eq!(headers.len(), 2);
    }

    #[test]
    // ensure the Data Sample Parser can read all the headers from teh csv file
    fn test_read_headers_order() {
        let mut expected = Vec::new();
        expected.push("column-Z");
        expected.push("column-D");
        expected.push("column-A");
        expected.push("column-G");
        let mut dsp = DataSampleParser::new();

        dsp.analyze_csv_file(&String::from("./tests/samples/sample-02.csv"), None)
            .unwrap();
        let headers = dsp.extract_headers();

        assert_eq!(headers, expected);
    }

    #[test]
    // ensure DataSampleParser can analyze a csv formatted file
    fn test_parse_csv_file() {
        let mut dsp = DataSampleParser::new();

        assert_eq!(
            dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
                .unwrap(),
            1
        );
    }

    #[test]
    // ensure DataSampleParser can analyze a csv formatted text
    fn test_parse_csv_data_using_defaults() {
        let mut dsp = DataSampleParser::new();
        let mut data = String::from("");
        data.push_str("\"firstname\",\"lastname\"\n");
        data.push_str("\"Aaron\",\"Aaberg\"\n");
        data.push_str("\"Aaron\",\"Aaby\"\n");
        data.push_str("\"Abbey\",\"Aadland\"\n");
        data.push_str("\"Abbie\",\"Aagaard\"\n");
        data.push_str("\"Abby\",\"Aakre\"");

        assert_eq!(dsp.analyze_csv_data(&data, None).unwrap(), 1);
    }

    #[test]
    // ensure DataSampleParser can analyze a csv formatted text
    fn test_parse_csv_data() {
        let mut dsp = DataSampleParser::new();
        let mut data = String::from("");
        data.push_str("\"firstname\"|\"lastname\"\n");
        data.push_str("\"Aaron\"|\"Aaberg\"\n");
        data.push_str("\"Aaron\"|\"Aaby\"\n");
        data.push_str("\"Abbey\"|\"Aadland\"\n");
        data.push_str("\"Abbie\"|\"Aagaard\"\n");
        data.push_str("\"Abby\"|\"Aakre\"");

        assert_eq!(dsp.analyze_csv_data(&data, Some(b'|')).unwrap(), 1);
    }
    #[test]
    // ensure DataSampleParser can analyze a csv formatted file
    fn test_generate_field_from_csv_file() {
        let mut dsp = DataSampleParser::new();

        dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
            .unwrap();
        println!(
            "Generated data for first name {}",
            dsp.generate_by_field_name("firstname".to_string())
        );
    }

    #[test]
    // ensure DataSampleParser can analyze a csv formatted file
    fn test_generate_record_from_csv_file() {
        let mut dsp = DataSampleParser::new();

        dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
            .unwrap();
        assert_eq!(dsp.generate_record().len(), 2);
    }

    #[test]
    // ensure DataSampleParser can analyze a csv formatted file
    fn test_parse_csv_file_bad() {
        let mut dsp = DataSampleParser::new();

        assert_eq!(
            dsp.analyze_csv_file(&String::from("./badpath/sample-01.csv"), None)
                .is_err(),
            true
        );
    }

    #[test]
    // ensure the DataSampleParser object can be saved to file
    fn test_save() {
        let mut dsp = DataSampleParser::new();
        dsp.analyze_csv_file(&String::from("./tests/samples/sample-00.csv"), None)
            .unwrap();

        assert_eq!(
            dsp.save(&String::from("./tests/samples/sample-00-dsp"))
                .unwrap(),
            true
        );
    }

    #[test]
    // ensure the DataSampleParser object can recognize the difference between realistic data and unrealistic generated data
    fn test_levenshtein_test() {
        let mut dsp = DataSampleParser::new();

        assert_eq!(
            dsp.levenshtein_distance(&"kitten".to_string(), &"sitting".to_string()),
            3 as usize
        );
    }

    #[test]
    // ensure the DataSampleParser object can recognize the difference between realistic data and unrealistic generated data
    fn test_realistic_data_test() {
        let mut dsp = DataSampleParser::new();

        assert_eq!(
            dsp.realistic_test(&"kitten".to_string(), &"sitting".to_string()),
            76.92307692307692 as f64
        );
    }

    #[test]
    // demo test
    fn test_demo() {
        let mut dsp = DataSampleParser::new();
        dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
            .unwrap();

        println!(
            "My new name is {} {}",
            dsp.generate_record()[0],
            dsp.generate_record()[1]
        );

        assert!(true);
    }

    #[test]
    // ensure the DataSampleParser object can generate test data as a csv file
    fn test_extract_headers_from_sample() {
        let mut dsp = DataSampleParser::new();

        dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
            .unwrap();
        let headers = dsp.extract_headers();

        assert_eq!(headers.len(), 2);
    }

    #[test]
    // ensure the DataSampleParser object can generate test data as a csv file
    fn test_generate_csv_test_data_from_sample() {
        let mut dsp = DataSampleParser::new();

        dsp.analyze_csv_file(&String::from("./tests/samples/sample-01.csv"), None)
            .unwrap();
        dsp.generate_csv(
            100,
            &String::from("./tests/samples/generated-01b.csv"),
            Some(b'|'),
        )
        .unwrap();

        let generated_row_count =
            match File::open(format!("{}", "./tests/samples/generated-01b.csv")) {
                Err(_e) => 0,
                Ok(f) => {
                    let mut count = 0;
                    let bf = BufReader::new(f);

                    for _line in bf.lines() {
                        count += 1;
                    }

                    count
                }
            };

        assert_eq!(generated_row_count, 101);
    }
}