//! Ares is an automatic decoding and cracking tool. https://github.com/bee-san/ares
// Warns in case we forget to include documentation
#![warn(
    missing_docs,
    clippy::missing_docs_in_private_items,
    clippy::missing_errors_doc,
    clippy::missing_panics_doc
)]

/// The main crate for the Ares project.
/// This provides the library API interface for Ares.
mod api_library_input_struct;
/// Checkers is a module that contains the functions that check if the input is plaintext
pub mod checkers;
/// CLI Arg Parsing library
pub mod cli;
/// CLI Input Parser parses the input from the CLI and returns a struct.
mod cli_input_parser;
/// The Config module enables a configuration module
/// Like a global API to access config details
pub mod config;
/// Decoders are the functions that actually perform the decodings.
pub mod decoders;
/// The filtration system builds what decoders to use at runtime
/// By default it will use them all.
mod filtration_system;
/// The searcher is the thing which searches for the plaintext
/// It is the core of the program.
mod searchers;
/// The storage module contains all the dictionaries and provides
/// storage of data to our decoderrs and checkers.
mod storage;
/// Timer for internal use
mod timer;

use checkers::{
    athena::Athena,
    checker_type::{Check, Checker},
};
use log::debug;

use crate::config::Config;

use self::decoders::crack_results::CrackResult;
/// The main function to call which performs the cracking.
/// ```rust
/// use ares::perform_cracking;
/// use ares::config::Config;
/// let mut config = Config::default();
/// // You can set the config to your liking using the Config struct
/// // Just edit the data like below if you want:
/// config.timeout = 5;
/// config.human_checker_on = false;
/// config.verbose = 0;
/// let result = perform_cracking("VGhlIG1haW4gZnVuY3Rpb24gdG8gY2FsbCB3aGljaCBwZXJmb3JtcyB0aGUgY3JhY2tpbmcu", config);
/// assert!(true);
/// // The result is an Option<DecoderResult> so we need to unwrap it
/// // The DecoderResult contains the text and the path
/// // The path is a vector of CrackResults which contains the decoder used and the keys used
/// // The text is a vector of strings because some decoders return more than 1 text (Caesar)
/// // Becuase the program has returned True, the first result is the plaintext (and it will only have 1 result).
/// // This is some tech debt we need to clean up https://github.com/bee-san/Ares/issues/130
/// assert!(result.unwrap().text[0] == "The main function to call which performs the cracking.");
/// ```
/// The human checker defaults to off in the config, but it returns the first thing it finds currently.
/// We have an issue for that here https://github.com/bee-san/Ares/issues/129
/// ```rust
/// use ares::perform_cracking;
/// use ares::config::Config;
/// let mut config = Config::default();
/// // You can set the config to your liking using the Config struct
/// // Just edit the data like below if you want:
/// config.timeout = 1;
/// let result = perform_cracking("thisisatestthatitwillneverget111", config);
/// assert!(true);
/// // If the program times out, or it cannot decode the text it will return None.
/// assert!(result.is_none());
/// ```
pub fn perform_cracking(text: &str, config: Config) -> Option<DecoderResult> {
    if check_if_input_text_is_plaintext(text) {
        debug!(
            "The input text provided to the program {} is the plaintext. Returning early.",
            text
        );
        return_early_because_input_text_is_plaintext();
        return None;
    }

    // Build a new search tree
    // This starts us with a node with no parents
    // let search_tree = searchers::Tree::new(text.to_string());
    // Perform the search algorithm
    // It will either return a failure or success.
    config::set_global_config(config);
    searchers::search_for_plaintext(text)
}

/// Checks if the given input is plaintext or not
/// Used at the start of the program to not waste CPU cycles
fn check_if_input_text_is_plaintext(text: &str) -> bool {
    let athena_checker = Checker::<Athena>::new();
    athena_checker.check(text).is_identified
}

/// A nice function to print when the input text is the plaintext
fn return_early_because_input_text_is_plaintext() {
    println!("Your input text is the plaintext 🥳")
}

/// DecoderResult is the result of decoders
#[derive(Debug)]
pub struct DecoderResult {
    /// The text we have from the decoder, as a vector
    /// because the decoder might return more than 1 text (caesar)
    pub text: Vec<String>,
    /// The list of decoders we have so far
    /// The CrackResult contains more than just each decoder, such as the keys used
    /// or the checkers used.
    pub path: Vec<CrackResult>,
}

#[cfg(test)]
mod tests {
    use super::perform_cracking;
    use crate::config::Config;

    #[test]
    fn test_perform_cracking_returns() {
        let config = Config::default();
        perform_cracking("SGVscCBJIG5lZWQgc29tZWJvZHkh", config);
    }

    #[test]
    fn test_perform_cracking_returns_successful() {
        // this will work after english checker can identify "CANARY: hello"
        // let result = perform_cracking("Q0FOQVJZOiBoZWxsbw==");
        // assert!(result.is_some());
        // assert!(result.unwrap() == "CANARY: hello")
        let config = Config::default();
        let result = perform_cracking("b2xsZWg=", config);
        assert!(result.is_some());
        assert!(result.unwrap().text[0] == "hello");
    }
    #[test]
    fn test_perform_cracking_returns_failure() {
        let config = Config::default();
        let result = perform_cracking("", config);
        assert!(result.is_none());
    }

    #[test]
    fn test_perform_cracking_returns_successful_base64_reverse() {
        let config = Config::default();
        let result = perform_cracking("aGVsbG8gdGhlcmUgZ2VuZXJhbA==", config);
        assert!(result.is_some());
        assert!(result.unwrap().text[0] == "hello there general")
    }

    #[test]
    fn test_early_exit_if_input_is_plaintext() {
        let config = Config::default();
        let result = perform_cracking("192.168.0.1", config);
        // We return None since the input is the plaintext
        assert!(result.is_none());
    }
    #[test]
    // Previously this would decode to `Fchohs as 13 dzoqsg!` because the English checker wasn't that good
    // This test makes sure we can decode it okay
    fn test_successfully_decode_caesar() {
        let config = Config::default();
        let result = perform_cracking("Ebgngr zr 13 cynprf!", config);
        // We return None since the input is the plaintext
        assert!(result.unwrap().text[0] == "Rotate me 13 places!");
    }
}