use axum::Json;
use serde::Serialize;
use std::env;

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub struct DidDocument {
    #[serde(rename = "@context")]
    context: Vec<String>,
    id: String,
    verification_method: Vec<VerificationMethod>,
    service: Vec<Service>,
}

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
struct VerificationMethod {
    id: String,
    #[serde(rename = "type")]
    type_: String,
    controller: String,
    public_key_multibase: Option<String>,
}

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
struct Service {
    id: String,
    #[serde(rename = "type")]
    type_: String,
    service_endpoint: String,
}

pub async fn did_document() -> Json<DidDocument> {
    let domain =
        env::var("APP_VIEW_DOMAIN").unwrap_or_else(|_| "api.blacksky.community".to_string());
    let did_id = format!("did:web:{domain}");
    let endpoint = format!("https://{domain}");

    Json(DidDocument {
        context: vec![
            "https://www.w3.org/ns/did/v1".to_string(),
            "https://w3id.org/security/multikey/v1".to_string(),
        ],
        verification_method: vec![VerificationMethod {
            id: format!("{did_id}#atproto"),
            type_: "Multikey".to_string(),
            controller: did_id.clone(),
            public_key_multibase: Some(
                "z42tusbpVy6BCE8tqcQAkvvRi9W3M7LEqLWNdTxtW2KicMNJ".to_string(),
            ),
        }],
        service: vec![Service {
            id: "#bsky_appview".to_string(),
            type_: "BskyAppView".to_string(),
            service_endpoint: endpoint,
        }],
        id: did_id,
    })
}