use axum::{
    extract::Request,
    http::StatusCode,
    middleware::Next,
    response::{IntoResponse, Response},
    Json,
};
use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
use serde_json::json;

use crate::models::Claims;

pub fn create_jwt(secret: &str, username: &str) -> anyhow::Result<String> {
    let exp = jsonwebtoken::get_current_timestamp() + 24 * 3600;
    let claims = Claims {
        sub: username.to_string(),
        exp: exp as usize,
    };
    let token = encode(
        &Header::default(),
        &claims,
        &EncodingKey::from_secret(secret.as_bytes()),
    )?;
    Ok(token)
}

pub fn decode_jwt(secret: &str, token: &str) -> anyhow::Result<Claims> {
    let token_data = decode::<Claims>(
        token,
        &DecodingKey::from_secret(secret.as_bytes()),
        &Validation::default(),
    )?;
    Ok(token_data.claims)
}

pub async fn auth_middleware(
    request: Request,
    next: Next,
) -> Result<Response, StatusCode> {
    let auth_header = request
        .headers()
        .get("authorization")
        .and_then(|value| value.to_str().ok());

    let token = match auth_header {
        Some(value) if value.starts_with("Bearer ") => &value[7..],
        _ => {
            return Ok((
                StatusCode::UNAUTHORIZED,
                Json(json!({"error": "Missing or invalid authorization header"})),
            )
                .into_response());
        }
    };

    let secret = std::env::var("JWT_SECRET").unwrap_or_else(|_| "secret".to_string());
    match decode_jwt(&secret, token) {
        Ok(_claims) => Ok(next.run(request).await),
        Err(_) => Ok((
            StatusCode::UNAUTHORIZED,
            Json(json!({"error": "Invalid token"})),
        )
            .into_response()),
    }
}