use std::{env, fs};

use rust_util::util_env as rust_util_env;
use rust_util::{debugging, util_env, warning};

use crate::consts;

pub const TINY_ENCRYPT_ENV_DEFAULT_ALGORITHM: &str = "TINY_ENCRYPT_DEFAULT_ALGORITHM";
pub const TINY_ENCRYPT_ENV_DEFAULT_COMPRESS: &str = "TINY_ENCRYPT_DEFAULT_COMPRESS";
pub const TINY_ENCRYPT_ENV_NO_PROGRESS: &str = "TINY_ENCRYPT_NO_PROGRESS";
pub const TINY_ENCRYPT_ENV_USE_DIALOGUER: &str = "TINY_ENCRYPT_USE_DIALOGUER";
pub const TINY_ENCRYPT_ENV_PIN: &str = "TINY_ENCRYPT_PIN";
pub const TINY_ENCRYPT_ENV_KEY_ID: &str = "TINY_ENCRYPT_KEY_ID";
pub const TINY_ENCRYPT_ENV_AUTO_SELECT_KEY_IDS: &str = "TINY_ENCRYPT_AUTO_SELECT_KEY_IDS";
pub const TINY_ENCRYPT_EVN_AUTO_COMPRESS_EXTS: &str = "TINY_ENCRYPT_AUTO_COMPRESS_EXTS";
pub const TINY_ENCRYPT_ENV_GPG_COMMAND: &str = "TINY_ENCRYPT_GPG_COMMAND";
pub const TINY_ENCRYPT_ENV_NO_DEFAULT_PIN_HINT: &str = "TINY_ENCRYPT_NO_DEFAULT_PIN_HINT";
pub const TINY_ENCRYPT_ENV_PIN_ENTRY: &str = "TINY_ENCRYPT_PIN_ENTRY";
pub const TINY_ENCRYPT_ENV_EXTERNAL_COMMAND: &str = "TINY_ENCRYPT_EXTERNAL_COMMAND";

pub fn get_default_encryption_algorithm() -> Option<&'static str> {
    let env_default_algorithm = rust_util_env::env_var(TINY_ENCRYPT_ENV_DEFAULT_ALGORITHM);
    debugging!("Environment variable {} = {:?}", TINY_ENCRYPT_ENV_DEFAULT_ALGORITHM, env_default_algorithm);
    if let Some(env_algorithm) = env_default_algorithm {
        let lower_default_algorithm = env_algorithm.to_lowercase();
        match lower_default_algorithm.as_str() {
            "aes" | "aes/gcm" => return Some(consts::TINY_ENC_AES_GCM),
            "chacha20" | "chacha20/poly1305" => return Some(consts::TINY_ENC_CHACHA20_POLY1305),
            _ => { warning!("Not matched any algorithm: {}", env_algorithm); }
        }
    }
    None
}

pub fn get_pin() -> Option<String> {
    env::var(TINY_ENCRYPT_ENV_PIN).ok()
}

pub fn get_key_id() -> Option<String> {
    rust_util_env::env_var(TINY_ENCRYPT_ENV_KEY_ID)
}

pub fn get_gpg_cmd() -> Option<String> {
    rust_util_env::env_var(TINY_ENCRYPT_ENV_GPG_COMMAND)
}

pub fn get_default_pin_entry() -> Option<String> {
    let default_pin_entry = "/usr/local/MacGPG2/libexec/pinentry-mac.app/Contents/MacOS/pinentry-mac";
    if let Ok(meta) = fs::metadata(default_pin_entry) {
        if meta.is_file() {
            return Some(default_pin_entry.to_string());
        }
    }
    get_pin_entry()
}

pub fn get_pin_entry() -> Option<String> {
    rust_util_env::env_var(TINY_ENCRYPT_ENV_PIN_ENTRY)
}

pub fn get_auto_select_key_ids() -> Option<Vec<String>> {
    get_env_with_split(TINY_ENCRYPT_ENV_AUTO_SELECT_KEY_IDS)
}

pub fn get_auto_compress_file_exts() -> Option<Vec<String>> {
    get_env_with_split(TINY_ENCRYPT_EVN_AUTO_COMPRESS_EXTS)
}

pub fn get_default_compress() -> Option<bool> {
    rust_util_env::env_var(TINY_ENCRYPT_ENV_DEFAULT_COMPRESS).map(|val| util_env::is_on(&val))
}

pub fn get_no_progress() -> bool {
    rust_util_env::is_env_on(TINY_ENCRYPT_ENV_NO_PROGRESS)
}

pub fn get_no_default_pin_hint() -> bool {
    rust_util_env::is_env_on(TINY_ENCRYPT_ENV_NO_DEFAULT_PIN_HINT)
}

pub fn get_use_dialoguer() -> bool {
    rust_util_env::is_env_on(TINY_ENCRYPT_ENV_USE_DIALOGUER)
}

fn get_env_with_split(env_name: &str) -> Option<Vec<String>> {
    let val = rust_util_env::env_var(env_name);
    debugging!("Environment variable {} = {:?}", env_name, &val);
    val.map(|env_values| {
        env_values.split(',').map(ToString::to_string).collect::<Vec<_>>()
    })
}