use magic_crypt::{MagicCryptTrait, new_magic_crypt};
use std::fs::{read_to_string, write};
use std::path::PathBuf;
use std::path::Path;
use std::fs::File;
use serde_json::{Value, json};
use rust_fuzzy_search::fuzzy_search_best_n;

pub fn encrypt_n_save_file(path: PathBuf, content: String){
    let mc = new_magic_crypt!("7J?VKYJib`=NIOpapW+zP8wD_#lPjP77Z)Q:4QUlH4`0rpMz7]>EIC%$RV-9*iW9AZ>Qk!OmAuH`8GzJ93xR4`KTl*-#fuCKzDfrPe&-A0?^Mz<F8IJ((oe+X,73iG", 256);

    let mut encrypted: String = String::new();

    for line in content.lines() {
        encrypted = encrypted.to_owned() + mc.encrypt_str_to_base64(line).as_str() + "\n";
    }
    let res = write(path, encrypted);
    match res {
        Ok(_) => {},
        Err(_) => println!("File save error!")
    }
}

pub fn decrypt_file(path: PathBuf) -> String {
    let mc = new_magic_crypt!("7J?VKYJib`=NIOpapW+zP8wD_#lPjP77Z)Q:4QUlH4`0rpMz7]>EIC%$RV-9*iW9AZ>Qk!OmAuH`8GzJ93xR4`KTl*-#fuCKzDfrPe&-A0?^Mz<F8IJ((oe+X,73iG", 256);

    let mut decrypted: String = String::new();

    let lines = read_to_string(path);
    match lines {
        Ok(lines) => {
            for line in lines.lines() {
                let dec_line = mc.decrypt_base64_to_string(&line);
                match dec_line {
                    Ok(line) => {
                        decrypted = decrypted.to_owned() + line.as_str() + "\n";
                        return decrypted;
                    },
                    Err(_) => {
                        println!("Что-то пошло не так!");
                    }
                }
            }
            return String::new();
        },
        Err(_) => {
            println!("Что-то не так...");
            return String::new();
        }
    }
}

#[tauri::command]
pub fn check_or_create_tasks_file(app_handle: tauri::AppHandle) {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let exist: bool = Path::new(&path).exists();
    if exist{
        let content = read_to_string(path);
        return match content {
            Ok(_) => {},
            Err(_) => {
                println!("Не удалось открыть конфигурационный файл!");
            }
        }
    } else{
        let path = Path::new(&path);
        let prefix = path.parent().unwrap();
        let file = std::fs::create_dir_all(prefix);
        match file{
            Ok(_) => {},
            Err(err) => println!("Не удалось создать директории! \n{}", err)
        }
        let file = File::create(path);
        match file{
            Ok(_) => {
                let data = String::from("{\
                    \"id\": 0,\
                    \"tasks\": {}\
                }");
                encrypt_n_save_file(path.into(), data);
            },
            Err(err) => println!("Не удалось создать файл! \n{}", err)
        }
    }
}

#[tauri::command]
pub fn get_tasks(app_handle: tauri::AppHandle) -> Value {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let content = decrypt_file(path);
    let data: Value = serde_json::from_str(content.as_str()).unwrap();

    let res = &data["tasks"];

    return res.clone();
}

#[tauri::command]
pub fn search_tasks(app_handle: tauri::AppHandle, value: String) -> Value {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let content = decrypt_file(path);
    let data: Value = serde_json::from_str(content.as_str()).unwrap();

    let mut tasks = vec![];

    let binding = data.clone();
    for (_key, value) in binding["tasks"].as_object().unwrap() {
        tasks.push(value["name"].as_str().unwrap().to_lowercase());
    }

    let tasks_str: Vec<&str> = tasks.iter().map(|s| &**s).collect();

    let n : usize = 5;
    let binding = value.to_lowercase();
    let res : Vec<(&str, f32)> = fuzzy_search_best_n(&binding, &tasks_str, n);

    let mut result = json!({});

    let res1 = res.clone();
    let binding1 = data.clone();
    for (name, score) in res1 {
        if score != 0.0 {
            for (key, value) in binding1["tasks"].as_object().unwrap() {
                if value.get("name").unwrap().as_str().unwrap().to_lowercase().as_str() == name {
                    result[key] = binding1["tasks"].get(key).unwrap().clone();
                    break;
                }
            }
        }
    }

    return result;
}

#[tauri::command]
pub fn add_task(app_handle: tauri::AppHandle, date: String, time: String, name: String, description: String, priority: String) {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let content = decrypt_file(path.clone());
    let mut data: Value = serde_json::from_str(content.as_str()).unwrap();

    let pending = data.clone();
    let id = &pending["id"];

    let task = json!({
        "id": id.to_string(),
        "date": date,
        "time": time,
        "name": name,
        "description": description,
        "priority": priority,
        "completed": false
    });

    data["id"] = (id.as_i64().unwrap() + 1).into();

    data["tasks"][id.to_string()] = task;
    encrypt_n_save_file(path.into(), data.to_string());
}

#[tauri::command]
pub fn edit_task(app_handle: tauri::AppHandle, id_task: String, name: String, description: String, priority: String) {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let content = decrypt_file(path.clone());
    let mut data: Value = serde_json::from_str(content.as_str()).unwrap();
    data["tasks"][id_task.clone()]["name"] = json!(name);
    data["tasks"][id_task.clone()]["description"] = json!(description);
    data["tasks"][id_task]["priority"] = json!(priority);

    encrypt_n_save_file(path.into(), data.to_string());
}

#[tauri::command]
pub fn delete_task(app_handle: tauri::AppHandle, id_task: String) {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let content = decrypt_file(path.clone());
    let mut data: Value = serde_json::from_str(content.as_str()).unwrap();

    let tasks = data["tasks"].as_object_mut().unwrap();
    let binding = tasks.clone();
    for (key, value) in binding{
        if id_task == value["id"] {
            tasks.remove(&key);
            break;
        }
    }
    data["tasks"] = json!(tasks);
    encrypt_n_save_file(path.into(), data.to_string());
}

#[tauri::command]
pub fn set_task_field(app_handle: tauri::AppHandle, id_task: String, field: String, value: String) {
    let mut path = app_handle.path_resolver().app_local_data_dir().unwrap();
    path.push("ToDo");
    path.push("tasks");

    path.set_extension("enc");

    let content = decrypt_file(path.clone());
    let mut data: Value = serde_json::from_str(content.as_str()).unwrap();
    data["tasks"][id_task][field] = json!(value);

    encrypt_n_save_file(path.into(), data.to_string());
}