//! Integration tests for the GitHub channel using a `wiremock` HTTP server
//! standing in for `api.github.com` and `raw.githubusercontent.com`.

use chrono::Utc;
use kez_channels::{Channel, ChannelError, github::GithubChannel};
use kez_core::{ClaimPayload, Identity, NostrSecret, SignedClaim};
use reqwest::Client;
use serde_json::json;
use wiremock::matchers::{header, method, path};
use wiremock::{Mock, MockServer, ResponseTemplate};

fn sign(subject: &str) -> SignedClaim {
    let secret = NostrSecret::generate();
    let primary = Identity::parse(format!("nostr:{}", secret.npub())).unwrap();
    let subject = Identity::parse(subject).unwrap();
    SignedClaim::sign(ClaimPayload::new(subject, primary, Utc::now()), &secret).unwrap()
}

fn channel_pointing_at(server: &MockServer) -> GithubChannel {
    let client = Client::builder()
        .user_agent("kez-channels-test/0.1")
        .build()
        .unwrap();
    GithubChannel::with_bases(client, server.uri(), server.uri())
}

#[tokio::test]
async fn verifies_proof_published_in_a_gist() {
    let server = MockServer::start().await;
    let signed = sign("github:jason");
    let markdown = signed.to_markdown_proof().unwrap();

    Mock::given(method("GET"))
        .and(path("/users/jason/gists"))
        .and(header("accept", "application/vnd.github+json"))
        .respond_with(ResponseTemplate::new(200).set_body_json(json!([
            {
                "files": {
                    "notes.txt": {
                        "raw_url": format!("{}/raw/notes.txt", server.uri())
                    },
                    "github-jason.kez.md": {
                        "raw_url": format!("{}/raw/github-jason.kez.md", server.uri())
                    }
                }
            }
        ])))
        .mount(&server)
        .await;

    Mock::given(method("GET"))
        .and(path("/raw/github-jason.kez.md"))
        .respond_with(ResponseTemplate::new(200).set_body_string(markdown))
        .mount(&server)
        .await;

    let channel = channel_pointing_at(&server);
    let identity = Identity::parse("github:jason").unwrap();
    let hit = channel.fetch_and_verify(&identity).await.unwrap();
    assert_eq!(hit.proof, signed);
}

#[tokio::test]
async fn falls_back_to_profile_readme_on_main() {
    let server = MockServer::start().await;
    let signed = sign("github:jason");
    let markdown = signed.to_markdown_proof().unwrap();

    // No matching gists.
    Mock::given(method("GET"))
        .and(path("/users/jason/gists"))
        .respond_with(ResponseTemplate::new(200).set_body_json(json!([])))
        .mount(&server)
        .await;

    Mock::given(method("GET"))
        .and(path("/jason/jason/main/README.md"))
        .respond_with(ResponseTemplate::new(200).set_body_string(markdown))
        .mount(&server)
        .await;

    let channel = channel_pointing_at(&server);
    let identity = Identity::parse("github:jason").unwrap();
    let hit = channel.fetch_and_verify(&identity).await.unwrap();
    assert_eq!(hit.proof, signed);
}

#[tokio::test]
async fn falls_back_to_master_when_main_missing() {
    let server = MockServer::start().await;
    let signed = sign("github:jason");
    let markdown = signed.to_markdown_proof().unwrap();

    Mock::given(method("GET"))
        .and(path("/users/jason/gists"))
        .respond_with(ResponseTemplate::new(200).set_body_json(json!([])))
        .mount(&server)
        .await;

    // main is 404, master serves the proof.
    Mock::given(method("GET"))
        .and(path("/jason/jason/main/README.md"))
        .respond_with(ResponseTemplate::new(404))
        .mount(&server)
        .await;
    Mock::given(method("GET"))
        .and(path("/jason/jason/master/README.md"))
        .respond_with(ResponseTemplate::new(200).set_body_string(markdown))
        .mount(&server)
        .await;

    let channel = channel_pointing_at(&server);
    let identity = Identity::parse("github:jason").unwrap();
    let hit = channel.fetch_and_verify(&identity).await.unwrap();
    assert_eq!(hit.proof, signed);
}

#[tokio::test]
async fn rejects_proof_signed_for_wrong_subject() {
    let server = MockServer::start().await;
    // Signed for github:mallory, but published in jason's gist.
    let signed = sign("github:mallory");
    let markdown = signed.to_markdown_proof().unwrap();

    Mock::given(method("GET"))
        .and(path("/users/jason/gists"))
        .respond_with(ResponseTemplate::new(200).set_body_json(json!([
            {
                "files": {
                    "kez.md": {
                        "raw_url": format!("{}/raw/kez.md", server.uri())
                    }
                }
            }
        ])))
        .mount(&server)
        .await;

    Mock::given(method("GET"))
        .and(path("/raw/kez.md"))
        .respond_with(ResponseTemplate::new(200).set_body_string(markdown))
        .mount(&server)
        .await;

    // No fallback README either.
    Mock::given(method("GET"))
        .and(path("/jason/jason/main/README.md"))
        .respond_with(ResponseTemplate::new(404))
        .mount(&server)
        .await;
    Mock::given(method("GET"))
        .and(path("/jason/jason/master/README.md"))
        .respond_with(ResponseTemplate::new(404))
        .mount(&server)
        .await;

    let channel = channel_pointing_at(&server);
    let identity = Identity::parse("github:jason").unwrap();
    let err = channel.fetch_and_verify(&identity).await.unwrap_err();
    assert!(
        matches!(err, ChannelError::SubjectMismatch { .. }),
        "expected SubjectMismatch, got {err:?}"
    );
}

#[tokio::test]
async fn returns_not_found_when_no_proof_anywhere() {
    let server = MockServer::start().await;

    Mock::given(method("GET"))
        .and(path("/users/jason/gists"))
        .respond_with(ResponseTemplate::new(200).set_body_json(json!([])))
        .mount(&server)
        .await;
    Mock::given(method("GET"))
        .and(path("/jason/jason/main/README.md"))
        .respond_with(ResponseTemplate::new(404))
        .mount(&server)
        .await;
    Mock::given(method("GET"))
        .and(path("/jason/jason/master/README.md"))
        .respond_with(ResponseTemplate::new(404))
        .mount(&server)
        .await;

    let channel = channel_pointing_at(&server);
    let identity = Identity::parse("github:jason").unwrap();
    let err = channel.fetch_and_verify(&identity).await.unwrap_err();
    assert!(
        matches!(err, ChannelError::NotFound(_) | ChannelError::Unreachable(_)),
        "expected NotFound/Unreachable, got {err:?}"
    );
}