Ben / RubHub

use anyhow::{Result, anyhow};
use reqwest::{Client, Response};

/// A test API client that wraps reqwest with cookie jar and provides
/// convenient methods for interacting with RubHub.
pub struct Api {
    client: Client,
    base_url: String,
}

impl Api {
    /// Create a new Api instance with the given base URL.
    pub fn new(base_url: &str) -> Self {
        let client = Client::builder()
            .cookie_store(true)
            .build()
            .expect("Failed to create reqwest client");

        Self {
            client,
            base_url: base_url.to_string(),
        }
    }

    /// Make a GET request to the given path and return the response.
    pub async fn get(&self, path: &str) -> Result<Response> {
        let url = format!("{}{}", self.base_url, path);
        Ok(self.client.get(&url).send().await?.error_for_status()?)
    }

    /// Make a GET request and return the response body as text.
    pub async fn get_text(&self, path: &str) -> Result<String> {
        Ok(self.get(path).await?.text().await?)
    }

    /// Assert that a GET request to the given path contains the expected text.
    pub async fn assert_contains(&self, path: &str, needle: &str) -> Result<()> {
        let body = self.get_text(path).await?;
        if body.contains(needle) {
            Ok(())
        } else {
            eprintln!("{body}");
            Err(anyhow!("{}{} is missing {:?}", self.base_url, path, needle))
        }
    }

    /// Register a new user account.
    pub async fn register(&self, username: &str, email: &str, password: &str) -> Result<Response> {
        let csrf_token = self.get_csrf_token("/registration").await?;

        let form = [
            ("username", username),
            ("email", email),
            ("password", password),
            ("_csrf_token", &csrf_token),
        ];

        Ok(self
            .client
            .post(format!("{}/registration", self.base_url))
            .form(&form)
            .send()
            .await?
            .error_for_status()?)
    }

    /// Login with the given credentials.
    pub async fn login(&self, username: &str, password: &str) -> Result<Response> {
        let csrf_token = self.get_csrf_token("/login").await?;

        let form = [
            ("username", username),
            ("password", password),
            ("_csrf_token", &csrf_token),
        ];

        Ok(self
            .client
            .post(format!("{}/login", self.base_url))
            .form(&form)
            .send()
            .await?
            .error_for_status()?)
    }

    /// Logout the current user.
    pub async fn logout(&self) -> Result<Response> {
        self.get("/logout").await
    }

    /// Create a new project with the given name and description.
    pub async fn create_project(&self, name: &str, description: &str) -> Result<Response> {
        let csrf_token = self.get_csrf_token("/projects/new").await?;

        let form = [
            ("name", name),
            ("description", description),
            ("_csrf_token", &csrf_token),
        ];

        Ok(self
            .client
            .post(format!("{}/projects/new", self.base_url))
            .form(&form)
            .send()
            .await?
            .error_for_status()?)
    }

    /// Fetch the CSRF token from the given page path.
    async fn get_csrf_token(&self, path: &str) -> Result<String> {
        let html = self.get_text(path).await?;
        extract_csrf_token(&html)
            .ok_or_else(|| anyhow!("Failed to extract CSRF token from {}", path))
    }
}

/// Extract CSRF token from HTML response.
/// Looks for: <input type="hidden" name="_csrf_token" value="TOKEN">
fn extract_csrf_token(html: &str) -> Option<String> {
    let needle = r#"name="_csrf_token" value=""#;
    let start = html.find(needle)? + needle.len();
    let rest = &html[start..];
    let end = rest.find('"')?;
    Some(rest[..end].to_string())
}