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use email_address_parser::EmailAddress;
use reqwest::blocking::Client;
use serde::{de::DeserializeOwned, Deserialize, Serialize};
use url::Url;

pub trait Api {
    fn login(&self, email: EmailAddress, password: &str) -> anyhow::Result<LoginResponse>;
}

#[derive(Serialize, Deserialize)]
pub struct LoginRequest {
    email: String,
    password: String,
}

#[derive(Serialize, Deserialize)]
pub enum LoginResponse {
    CreatedAccount { email: String, token: String },
    LoggedIn { email: String, token: String },
}

pub struct HttpApi {
    client: Client,
    base: Url,
}

impl HttpApi {
    pub fn new(base: &Url) -> anyhow::Result<Self> {
        anyhow::ensure!(base.as_str().ends_with("/"), "API url must end with a /");

        Ok(Self {
            client: Client::new(),
            base: base.clone(),
        })
    }

    fn call_endpoint<I, O>(&self, endpoint: &str, body: I) -> anyhow::Result<O>
    where
        I: Serialize,
        O: DeserializeOwned,
    {
        Ok(self
            .client
            .post(self.base.join(endpoint)?)
            .json(&body)
            .send()?
            .json()?)
    }
}

impl Api for HttpApi {
    fn login(&self, email: EmailAddress, password: &str) -> anyhow::Result<LoginResponse> {
        self.call_endpoint(
            "login",
            LoginRequest {
                email: email.to_string(),
                password: password.to_string(),
            },
        )
    }
}