use serde::{Serialize, Deserialize};

use crate::database;
use crate::types::response::{Result, ResponseCode};


#[derive(Serialize, Deserialize, Debug)]
pub struct User {
    pub user_id: u64,
    pub firstname: String,
    pub lastname: String,
    pub email: String,
    pub password: String,
    pub gender: String,
    pub date: u64,
    pub day: u8,
    pub month: u8,
    pub year: u32,
}

impl User {

    pub fn from_user_id(user_id: u64, hide_password: bool) -> Result<Self> {
        let Ok(Some(user)) = database::users::get_user_by_id(user_id, hide_password) else {
            return Err(ResponseCode::BadRequest.msg("User does not exist"))
        };

        Ok(user)
    }

    pub fn from_user_ids(user_ids: Vec<u64>) -> Vec<Self> {
        user_ids.iter().map(|user_id| {
            let Ok(Some(user)) = database::users::get_user_by_id(*user_id, true) else {
                return None;
            };
            Some(user)
        }).flatten().collect()
    }

    pub fn from_user_page(page: u64) -> Result<Vec<Self>> {
        let Ok(users) = database::users::get_user_page(page, true) else {
            return Err(ResponseCode::BadRequest.msg("Failed to fetch users"))
        };
        Ok(users)
    }

    pub fn from_email(email: &str) -> Result<Self> {
        let Ok(Some(user)) = database::users::get_user_by_email(email, false) else {
            return Err(ResponseCode::BadRequest.msg("User does not exist"))
        };

        Ok(user)
    }

    pub fn from_password(password: &str) -> Result<Self> {
        let Ok(Some(user)) = database::users::get_user_by_password(password, true) else {
            return Err(ResponseCode::BadRequest.msg("User does not exist"))
        };

        Ok(user)
    }

    pub fn new(firstname: String, lastname: String, email: String, password: String, gender: String, day: u8, month: u8, year: u32) -> Result<Self> {
        if let Ok(_) = User::from_email(&email) {
            return Err(ResponseCode::BadRequest.msg(&format!("Email is already in use by {}", &email)))
        }

        if let Ok(user) = User::from_password(&password) {
            return Err(ResponseCode::BadRequest.msg(&format!("Password is already in use by {}", user.email)))
        }
        
        let Ok(user) = database::users::add_user(&firstname, &lastname, &email, &password, &gender, day, month, year) else {
            return Err(ResponseCode::InternalServerError.msg("Failed to create new uesr"))
        };

        Ok(user)
    }
    
}