use std::fs;

use axum::{
    body::Body,
    http::{Request, StatusCode},
};
use http_body_util::BodyExt;
use serde_json::Value;
use tempfile::TempDir;
use tower::ServiceExt;

async fn test_app() -> (axum::Router, TempDir) {
    let temp_dir = TempDir::new().expect("temporary directory should be created");
    let pool = task_pilot_backend::database::connect("sqlite::memory:")
        .await
        .expect("test database should initialize");
    let app = task_pilot_backend::app(pool, temp_dir.path().join("logs"))
        .await
        .expect("test app should start");
    (app, temp_dir)
}

#[tokio::test]
async fn health_endpoint_returns_service_metadata() {
    let (app, _temp_dir) = test_app().await;
    let response = app
        .oneshot(
            Request::builder()
                .uri("/api/v1/health")
                .body(Body::empty())
                .expect("request should build"),
        )
        .await
        .expect("router should respond");

    assert_eq!(response.status(), StatusCode::OK);

    let body = response
        .into_body()
        .collect()
        .await
        .expect("response body should be readable")
        .to_bytes();
    let json: Value = serde_json::from_slice(&body).expect("response should be JSON");

    assert_eq!(json["status"], "ok");
    assert_eq!(json["service"], "task-pilot-backend");
    assert_eq!(json["version"], env!("CARGO_PKG_VERSION"));
}

#[tokio::test]
async fn openapi_endpoint_describes_health_api() {
    let (app, _temp_dir) = test_app().await;
    let response = app
        .oneshot(
            Request::builder()
                .uri("/api/v1/openapi.json")
                .body(Body::empty())
                .expect("request should build"),
        )
        .await
        .expect("router should respond");

    assert_eq!(response.status(), StatusCode::OK);

    let body = response
        .into_body()
        .collect()
        .await
        .expect("response body should be readable")
        .to_bytes();
    let json: Value = serde_json::from_slice(&body).expect("response should be JSON");

    assert_eq!(json["info"]["title"], "TaskPilot API");
    assert!(json["paths"]["/api/v1/health"]["get"].is_object());
    assert!(json["paths"]["/api/v1/system/directories"]["get"].is_object());
}

fn encode_query_path(path: &std::path::Path) -> String {
    path.to_string_lossy()
        .replace('%', "%25")
        .replace(':', "%3A")
        .replace('\\', "%5C")
}

async fn get_json(app: &axum::Router, uri: &str) -> (StatusCode, Value) {
    let response = app
        .clone()
        .oneshot(
            Request::builder()
                .uri(uri)
                .body(Body::empty())
                .expect("request should build"),
        )
        .await
        .expect("router should respond");
    let status = response.status();
    let body = response
        .into_body()
        .collect()
        .await
        .expect("response body should be readable")
        .to_bytes();

    (status, serde_json::from_slice(&body).unwrap_or(Value::Null))
}

#[tokio::test]
async fn directory_listing_endpoint_returns_subdirectories() {
    let (app, temp_dir) = test_app().await;
    let project = temp_dir.path().join("project");
    fs::create_dir_all(project.join("nested")).expect("nested directory should be created");
    fs::write(project.join("file.txt"), "x").expect("file should be written");

    let uri = format!(
        "/api/v1/system/directories?path={}",
        encode_query_path(&project)
    );
    let (status, body) = get_json(&app, &uri).await;

    assert_eq!(status, StatusCode::OK);
    assert_eq!(body["path"], project.to_string_lossy().into_owned());
    let entries = body["entries"]
        .as_array()
        .expect("entries should be an array");
    assert_eq!(entries.len(), 1);
    assert_eq!(entries[0]["name"], "nested");
    assert_eq!(
        entries[0]["path"],
        project.join("nested").to_string_lossy().into_owned()
    );
}

#[tokio::test]
async fn directory_listing_endpoint_rejects_relative_paths() {
    let (app, _temp_dir) = test_app().await;

    let (status, body) = get_json(&app, "/api/v1/system/directories?path=relative").await;

    assert_eq!(status, StatusCode::BAD_REQUEST);
    assert_eq!(body["code"], "DIRECTORY_PATH_INVALID");
}

#[tokio::test]
async fn directory_listing_endpoint_returns_drives_without_path() {
    let (app, _temp_dir) = test_app().await;

    let (status, body) = get_json(&app, "/api/v1/system/directories").await;

    assert_eq!(status, StatusCode::OK);
    assert!(body["path"].is_null());
    assert!(
        !body["entries"]
            .as_array()
            .expect("entries should be an array")
            .is_empty()
    );
}