use actix_web::http::header::ContentType;
use actix_web::{get, post, web, HttpResponse, Responder};
use gamenight_database::user::{count_users_with_email, count_users_with_username};
use serde::{Deserialize, Serialize};
use uuid::Uuid;
use validator::{Validate, ValidateArgs, ValidationError};
use crate::models::login::Login;
use crate::models::registration::Registration;
use crate::models::token::Token;
use crate::models::user::User;
use crate::request::error::ApiError;
use crate::request::authorization::get_token;
use serde_json;
use gamenight_database::{DbPool, GetConnection};

use super::authorization::AuthUser;

impl From<Login> for gamenight_database::user::LoginUser {
    fn from(val: Login) -> Self {
        gamenight_database::user::LoginUser {
            username: val.username,
            password: val.password
        }
    }
}

impl From<Registration> for gamenight_database::user::Register {
    fn from(val: Registration) -> Self {
        gamenight_database::user::Register {
            email: val.email,
            username: val.username,
            password: val.password
        }
    }
}

pub struct RegisterContext<'v_a> {
    pub pool: &'v_a DbPool
}

pub fn unique_username(username: &String, context: &RegisterContext) -> Result<(), ValidationError> {
    let mut conn = context.pool.get_conn();

    match count_users_with_username(&mut conn, username)
    {
        Ok(0) => Ok(()),
        Ok(_) => Err(ValidationError::new("User already exists")),
        Err(_) => Err(ValidationError::new("Database error while validating user")),
    }
}

pub fn unique_email(email: &String, context: &RegisterContext) -> Result<(), ValidationError> {
    let mut conn = context.pool.get_conn();

    match count_users_with_email(&mut conn, email)
    {
        Ok(0) => Ok(()),
        Ok(_) => Err(ValidationError::new("email already exists")),
        Err(_) => Err(ValidationError::new("Database error while validating email"))
    }
}

#[derive(Serialize, Deserialize, Clone, Validate)]
#[validate(context = RegisterContext::<'v_a>)]
pub struct ValidatableRegistration {
    #[validate(
        length(min = 1),
        custom(function = "unique_username", use_context)
    )]
    pub username: String,
    #[validate(
        email,
        custom(function = "unique_email", use_context)
    )]
    pub email: String,
    #[validate(length(min = 10), must_match(other = "password_repeat", ))]
    pub password: String,
    pub password_repeat: String,
}

impl From<Registration> for ValidatableRegistration {
    fn from(value: Registration) -> Self {
        Self {
            username: value.username,
            email: value.email,
            password: value.password,
            password_repeat: value.password_repeat
        }
    }
}

#[get("/token")]
pub async fn login(pool: web::Data<DbPool>, login_data: web::Json<Login>) -> Result<impl Responder, ApiError> {
    let data = login_data.into_inner();

    if let Ok(Some(user)) = web::block(move || {
        let mut conn = pool.get_conn();
        gamenight_database::login(&mut conn, data.into())
    })
    .await?
    {
        let token = get_token(&user)?;
        let response = Token{ jwt_token: Some(token) };
        Ok(HttpResponse::Ok()
            .content_type(ContentType::json())
            .body(serde_json::to_string(&response)?)
        )
    }
    else {
        Err(ApiError{status: 401, message: "User doesn't exist or password doesn't match".to_string()})
    }
}

#[post("/user")]
pub async fn register(pool: web::Data<DbPool>, register_data: web::Json<Registration>) -> Result<impl Responder, ApiError> {
    web::block(move || -> Result<(), ApiError> {
        let validatable_registration: ValidatableRegistration = register_data.clone().into();
        validatable_registration.validate_with_args(&RegisterContext{pool: &pool})?;
        let register_request = register_data.into_inner().into();
        let mut conn = pool.get_conn();
        gamenight_database::register(&mut conn, register_request)?;
        Ok(())
    }).await??;

    Ok(HttpResponse::Ok())
}

#[derive(Deserialize)]
struct UserInfo {
    pub uuid: String
}

impl From<gamenight_database::user::User> for User {
    fn from(value: gamenight_database::user::User) -> Self {
        Self {
            id: Some(value.id.to_string()),
            username: value.username,
            email: None,

        }
    }
}

#[get("/user/{user_id}")]
pub async fn get_user(pool: web::Data<DbPool>, _user: AuthUser, path: web::Path<UserInfo>) -> Result<impl Responder, ApiError> {
    let mut conn = pool.get_conn();
    
    let user = gamenight_database::user::get_user(&mut conn, Uuid::parse_str(&path.uuid)?)?;
    Ok(HttpResponse::Ok()
            .content_type(ContentType::json())
            .body(serde_json::to_string(&user)?))
}

#[get("/user/{user_id}")]
pub async fn get_user_unauthenticated(_path: web::Path<UserInfo>) -> Result<impl Responder, ApiError> {
    Ok(HttpResponse::Forbidden())
}