#![doc = include_str!("../.github/README.md")]
// localizer-rs
// Version: 1.2.0

// Copyright (c) 2023-present ElBe Development.

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the 'Software'),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

/////////////
// EXPORTS //
/////////////

pub mod errors;


////////////////////////////////
// IMPORTS AND USE STATEMENTS //
////////////////////////////////

use std::fs::File;
use std::io::BufReader;
use std::path::Path;

use serde_json;


///////////////////
// CONFIG OBJECT //
///////////////////

/// Localization config object.
///
/// Use [`Config::new()`] to create config objects instead of using this struct.
///
/// # Parameters
///
/// - `path`: The directory containing the translation files.
///   The directory is relative to the path the executable was executed from.
/// - `language`: The language to translate to.
///
/// # Returns
///
/// A new `Config` object with the specified path and language.
///
/// # Examples
///
/// ```rust
/// # use localizer_rs;
/// localizer_rs::Config {
///     path: "path".to_owned(),
///     language: "language".to_owned()
/// };
/// ```
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct Config {
    /// The directory containing the translation files. The directory is relative to the path the
    /// executable was executed from.
    pub path: String,
    /// The language to translate to.
    pub language: String,
}


//////////////////////
// CONFIG FUNCTIONS //
//////////////////////

impl Config {
    /// Creates a new config object.
    ///
    /// # Parameters
    ///
    /// - `path`: The directory containing the translation files.
    ///   The directory is relative to the path the executable was executed from.
    /// - `language`: The language to translate to.
    ///
    /// # Returns
    ///
    /// A new `Config` object with the specified path and language.
    ///
    /// # Panics
    ///
    /// Panics if the Path provided is invalid.
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use localizer_rs;
    /// localizer_rs::Config::new("examples/translations", "language");
    /// ```
    ///
    /// # See also
    ///
    /// - [`Config`]
    pub fn new(path: &str, language: &str) -> Config {
        let mut config: Config = Config {
            path: "".to_string(),
            language: "".to_string(),
        }
        .to_owned();
        config = config.set_language(language).to_owned();
        config = config.set_path(path).to_owned();

        return config;
    }

    /// Sets the path for the config object.
    ///
    /// # Parameters
    ///
    /// - `self`: The config object. This must be mutable.
    /// - `str_path`: The directory containing the translation files.
    ///   The directory is relative to the path the executable was executed from.
    ///
    /// # Returns
    ///
    /// The modified `Config` object with the specified path.
    ///
    /// # Panics
    ///
    /// Panics if the Path provided is invalid.
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use localizer_rs;
    /// # let mut config: localizer_rs::Config = localizer_rs::Config::new("examples/translations", "language");
    /// config.set_path("examples");
    /// ```
    ///
    /// # See also
    ///
    /// - [`Config`]
    pub fn set_path(&mut self, str_path: &str) -> &Config {
        let path: &Path = Path::new(str_path);

        match path.try_exists() {
            Ok(value) => {
                if !value {
                    let error: errors::Error =
                        errors::Error::new("OS Error", "Translation path was not found", 1);
                    error.raise(format!("Path: {:?}", str_path).as_str());
                }
            }
            Err(_error) => {
                let error: errors::Error = errors::Error::new("OS Error", "Could not open path", 2);
                error.raise(format!("Path: {:?}\nDetails: {}", str_path, _error).as_str());
            }
        }

        self.path = String::from(match path.to_owned().to_str() {
            Some(value) => value,
            None => {
                let error: errors::Error =
                    errors::Error::new("OS Error", "Path does not seem to be valid", 3);
                error.raise(format!("Path: {:?}", str_path).as_str());
                ""
            }
        });
        return self;
    }

    /// Sets the language for the config object.
    ///
    /// # Parameters
    ///
    /// - `self`: The config object. This must be mutable.
    /// - `language`: The language to translate to.
    ///
    /// # Returns
    ///
    /// The modified `Config` object with the specified language.
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use localizer_rs;
    /// # let mut config: localizer_rs::Config = localizer_rs::Config::new("examples/translations", "language");
    /// config.set_language("en");
    /// ```
    ///
    /// # See also
    ///
    /// - [`Config`]
    pub fn set_language(&mut self, language: &str) -> &Config {
        self.language = language.to_string();
        return self;
    }

    /// Translates the specified key in the language specified in the config.
    ///
    /// # Parameters
    ///
    /// - `self`: The config object.
    /// - `key`: The key to translate to.
    /// - `arguments`: The arguments to replace.
    ///
    /// # Returns
    ///
    /// A `String` containing the translated value.
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use localizer_rs;
    /// # let config: localizer_rs::Config = localizer_rs::Config::new("examples/translations", "en");
    /// config.t("test", vec![]);
    /// ```
    ///
    /// # See also
    ///
    /// - [`t!()`]
    /// - [`Config`]
    pub fn t(&self, key: &str, arguments: Vec<(&str, &str)>) -> String {
        return self.translate(key, arguments);
    }

    /// Translates the specified key in the language specified in the config.
    ///
    /// # Parameters
    ///
    /// - `self`: The config object.
    /// - `key`: The key to translate to.
    /// - `arguments`: The arguments to replace.
    ///
    /// # Returns
    ///
    /// A `String` containing the translated value.
    ///
    /// # Raises
    ///
    /// This method throws an exception and exits if
    ///
    /// - The translation file could not be found
    /// - The translation file could not be opened
    /// - The translation file could not be parsed
    /// - The parsed json could not be converted to a json value
    /// - The converted json could not be indexed
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use localizer_rs;
    /// # let config: localizer_rs::Config = localizer_rs::Config::new("examples/translations", "en");
    /// config.translate("test", vec![]);
    /// ```
    ///
    /// # See also
    ///
    /// - [`t!()`]
    /// - [`Config`]
    /// - [`Config::t()`]
    /// - [`serde_json`]
    pub fn translate(&self, key: &str, mut arguments: Vec<(&str, &str)>) -> String {
        let mut colors: Vec<(&str, &str)> = vec![
            // Formatting codes
            ("end", "\x1b[0m"),
            ("bold", "\x1b[1m"),
            ("italic", "\x1b[3m"),
            ("underline", "\x1b[4m"),
            ("overline", "\x1b[53m"),

            // Foreground colors
            ("color.black", "\x1b[30m"),
            ("color.red", "\x1b[31m"),
            ("color.green", "\x1b[32m"),
            ("color.yellow", "\x1b[33m"),
            ("color.blue", "\x1b[34m"),
            ("color.magenta", "\x1b[35m"),
            ("color.cyan", "\x1b[36m"),
            ("color.white", "\x1b[37m"),

            // Bright foreground colors
            ("color.bright_black", "\x1b[90m"),
            ("color.bright_red", "\x1b[91m"),
            ("color.bright_green", "\x1b[92m"),
            ("color.bright_yellow", "\x1b[93m"),
            ("color.bright_blue", "\x1b[94m"),
            ("color.bright_magenta", "\x1b[95m"),
            ("color.bright_cyan", "\x1b[96m"),
            ("color.bright_white", "\x1b[97m"),

            // Background colors
            ("back.black", "\x1b[40m"),
            ("back.red", "\x1b[41m"),
            ("back.green", "\x1b[42m"),
            ("back.yellow", "\x1b[43m"),
            ("back.blue", "\x1b[44m"),
            ("back.magenta", "\x1b[45m"),
            ("back.cyan", "\x1b[46m"),
            ("back.white", "\x1b[47m"),

            // Bright background colors
            ("back.bright_black", "\x1b[100m"),
            ("back.bright_red", "\x1b[101m"),
            ("back.bright_green", "\x1b[102m"),
            ("back.bright_yellow", "\x1b[103m"),
            ("back.bright_blue", "\x1b[104m"),
            ("back.bright_magenta", "\x1b[105m"),
            ("back.bright_cyan", "\x1b[106m"),
            ("back.bright_white", "\x1b[107m"),
        ];
        arguments.append(&mut colors);

        let file: File = match File::open(Path::new(
            format!("./{}/{}.json", &self.path, &self.language).as_str(),
        )) {
            Ok(value) => value,
            Err(_error) => {
                let error: errors::Error =
                    errors::Error::new("OS Error", "Could not open translation file", 4);
                error.raise(
                    format!(
                        "File: ./{}/{}.json\nError: {}",
                        &self.path, &self.language, _error
                    )
                    .as_str(),
                );

                return "".to_owned();
            }
        };
        let reader: BufReader<File> = BufReader::new(file);

        let json: serde_json::Value = match serde_json::to_value::<serde_json::Value>(
            match serde_json::from_reader::<BufReader<File>, serde_json::Value>(reader) {
                Ok(value) => value,
                Err(_error) => {
                    let error: errors::Error = errors::Error::new(
                        "Parsing error",
                        "Translation file could not be parsed",
                        5,
                    );
                    error.raise(
                        format!(
                            "File: ./{}/{}.json\nError: {}",
                            &self.path, &self.language, _error
                        )
                        .as_str(),
                    );

                    return "".to_owned();
                }
            },
        ) {
            Ok(value) => value,
            Err(_error) => {
                let error: errors::Error =
                    errors::Error::new("Converting error", "Could not convert to json value", 6);
                error.raise(
                    format!(
                        "File: ./{}/{}.json\nError: {}",
                        &self.path, &self.language, _error
                    )
                    .as_str(),
                );

                return "".to_owned();
            }
        }
        .to_owned();
        let mut result: String = match json[key].as_str() {
            Some(value) => value.to_string(),
            None => {
                let error: errors::Error =
                    errors::Error::new("Indexing error", "Could not index json value", 6);
                error.raise(
                    format!(
                        "Index: {}\nFile: ./{}/{}.json",
                        key, &self.path, &self.language
                    )
                    .as_str(),
                );

                return "".to_owned();
            }
        };

        for (key, value) in arguments {
            result = result.replace(("{{".to_owned() + key + "}}").as_str(), value);
        }

        return result;
    }
}


/// Translates the specified key in the language specified in the config.
///
/// # Parameters
///
/// - `config`: The config object.
/// - `key`: The key to translate to.
/// - `arguments`: Optional parameter. The arguments to replace. Has to be of type `"name" = "value"`.
///
/// # Returns
///
/// A `String` containing the translated value.
///
/// # Examples
///
/// ```rust
/// # use localizer_rs;
/// # let config: localizer_rs::Config = localizer_rs::Config::new("examples/translations", "en");
/// localizer_rs::t!(config, "test");
/// localizer_rs::t!(config, "test", "variable" = "content");
/// ```
///
/// # See also
///
/// - [`Config`]
/// - [`Config::t()`]
#[macro_export]
macro_rules! t {
    ($config:expr, $key:expr) => {
        {
            $config.t($key, vec![])
        }
    };

    ($config:expr, $key:expr, $($argument_name:literal = $argument_value:literal),* $(,)?) => {
        {
            let mut arguments: Vec<(&str, &str)> = vec![];

            $(
                arguments.push(($argument_name, $argument_value));
            )*

            $config.t($key, arguments)
        }
    };
}