//! Integration tests for the authentication flow.
//!
//! Tests register, login, magic link verify, /me, and logout endpoints.
//! Turnstile and email services are bypassed using test keys.
//!
//! Requires a running Postgres instance. Set `TEST_DATABASE_URL` to run.

mod common;

use axum::body::Body;
use axum::http::{Method, Request, StatusCode};

fn require_test_db() -> bool {
    std::env::var("TEST_DATABASE_URL").is_ok()
}

// ── Register ─────────────────────────────────────────────────────────────

#[tokio::test]
async fn register_with_valid_email_returns_200() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (status, body) = app.register_user_via_api("newuser@example.com").await;

    assert_eq!(status, StatusCode::OK, "Register should return 200");
    assert!(
        body["message"].as_str().unwrap_or("").len() > 0,
        "Response should contain a message"
    );
}

#[tokio::test]
async fn register_with_invalid_email_returns_400() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let body = serde_json::json!({
        "email": "not-an-email",
        "turnstile_token": "test-token"
    });
    let (status, resp) = app.post("/api/v1/auth/register", &body).await;

    assert_eq!(
        status,
        StatusCode::BAD_REQUEST,
        "Register with invalid email should return 400"
    );
    assert_eq!(resp["error"], "bad_request");
}

#[tokio::test]
async fn register_with_missing_turnstile_token_returns_422() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    // Omit turnstile_token entirely — Axum should fail to deserialize
    let body = serde_json::json!({
        "email": "user@example.com"
    });
    let (status, _) = app.post("/api/v1/auth/register", &body).await;

    // Axum returns 422 for JSON deserialization errors
    assert!(
        status == StatusCode::UNPROCESSABLE_ENTITY || status == StatusCode::BAD_REQUEST,
        "Register with missing turnstile_token should return 422 or 400, got {}",
        status
    );
}

#[tokio::test]
async fn register_duplicate_email_returns_same_response() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // Register the user for the first time
    let (status1, body1) = app.register_user_via_api("dup@example.com").await;
    assert_eq!(status1, StatusCode::OK);

    // Register the same email again — should return the same response (anti-enumeration)
    let (status2, body2) = app.register_user_via_api("dup@example.com").await;
    assert_eq!(status2, StatusCode::OK);

    // Both responses should have the same message
    assert_eq!(
        body1["message"], body2["message"],
        "Duplicate registration should return the same message (anti-enumeration)"
    );
}

// ── Login ────────────────────────────────────────────────────────────────

#[tokio::test]
async fn login_existing_user_returns_200() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // First, create a user
    app.create_test_user("login-existing@example.com").await;

    let body = serde_json::json!({
        "email": "login-existing@example.com",
        "turnstile_token": "test-token"
    });
    let (status, resp) = app.post("/api/v1/auth/login", &body).await;

    assert_eq!(status, StatusCode::OK, "Login should return 200");
    assert!(
        resp["message"].as_str().unwrap_or("").len() > 0,
        "Response should contain a message"
    );
}

#[tokio::test]
async fn login_nonexistent_user_returns_200_anti_enumeration() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    let body = serde_json::json!({
        "email": "nonexistent@example.com",
        "turnstile_token": "test-token"
    });
    let (status, resp) = app.post("/api/v1/auth/login", &body).await;

    assert_eq!(
        status,
        StatusCode::OK,
        "Login with non-existing email should also return 200 (anti-enumeration)"
    );
    assert!(
        resp["message"].as_str().unwrap_or("").len() > 0,
        "Response should contain a message"
    );
}

#[tokio::test]
async fn login_invalid_email_returns_400() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let body = serde_json::json!({
        "email": "no-at-sign",
        "turnstile_token": "test-token"
    });
    let (status, resp) = app.post("/api/v1/auth/login", &body).await;

    assert_eq!(
        status,
        StatusCode::BAD_REQUEST,
        "Login with invalid email should return 400"
    );
    assert_eq!(resp["error"], "bad_request");
}

// ── Verify (magic link) ─────────────────────────────────────────────────

#[tokio::test]
async fn verify_valid_token_sets_session_cookie_and_redirects() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // Create a user and a magic link token
    app.create_test_user("verify-ok@example.com").await;
    let raw_token = app
        .create_magic_link_for_email("verify-ok@example.com")
        .await
        .expect("Should create a magic link token");

    // Call verify
    let uri = format!("/api/v1/auth/verify?token={}", raw_token);
    let req = Request::builder()
        .method(Method::GET)
        .uri(&uri)
        .body(Body::empty())
        .unwrap();

    let response = app.raw_request(req).await;
    let status = response.status();

    // Should redirect (3xx)
    assert!(
        status.is_redirection(),
        "Verify with valid token should redirect, got {}",
        status
    );

    // Should have a Set-Cookie header with the session cookie
    let set_cookie = response
        .headers()
        .get("set-cookie")
        .map(|v| v.to_str().unwrap_or(""))
        .unwrap_or("");
    assert!(
        set_cookie.contains("ai_synth_session="),
        "Response should set the session cookie, got: {}",
        set_cookie
    );
    assert!(
        set_cookie.contains("HttpOnly"),
        "Session cookie should be HttpOnly"
    );
}

#[tokio::test]
async fn verify_invalid_token_redirects_with_error() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // Call verify with a bogus token
    let req = Request::builder()
        .method(Method::GET)
        .uri("/api/v1/auth/verify?token=totally-invalid-token")
        .body(Body::empty())
        .unwrap();

    let response = app.raw_request(req).await;
    let status = response.status();

    // Should redirect to error page
    assert!(
        status.is_redirection(),
        "Verify with invalid token should redirect, got {}",
        status
    );

    // The redirect location should contain error=invalid_token
    let location = response
        .headers()
        .get("location")
        .map(|v| v.to_str().unwrap_or(""))
        .unwrap_or("");
    assert!(
        location.contains("error=invalid_token"),
        "Redirect location should contain error=invalid_token, got: {}",
        location
    );
}

#[tokio::test]
async fn verify_already_used_token_redirects_with_error() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // Create user and magic link
    app.create_test_user("verify-reuse@example.com").await;
    let raw_token = app
        .create_magic_link_for_email("verify-reuse@example.com")
        .await
        .expect("Should create token");

    // First verification — should succeed
    let uri = format!("/api/v1/auth/verify?token={}", raw_token);
    let req1 = Request::builder()
        .method(Method::GET)
        .uri(&uri)
        .body(Body::empty())
        .unwrap();
    let response1 = app.raw_request(req1).await;
    assert!(
        response1.status().is_redirection(),
        "First verify should redirect (success)"
    );
    // The first verification should set a session cookie (no error in location)
    let location1 = response1
        .headers()
        .get("location")
        .map(|v| v.to_str().unwrap_or(""))
        .unwrap_or("");
    assert!(
        !location1.contains("error="),
        "First verify should not redirect with error"
    );

    // Second verification with the same token — should fail (single-use)
    let req2 = Request::builder()
        .method(Method::GET)
        .uri(&uri)
        .body(Body::empty())
        .unwrap();
    let response2 = app.raw_request(req2).await;
    assert!(
        response2.status().is_redirection(),
        "Second verify should also redirect"
    );
    let location2 = response2
        .headers()
        .get("location")
        .map(|v| v.to_str().unwrap_or(""))
        .unwrap_or("");
    assert!(
        location2.contains("error=invalid_token"),
        "Second verify (reused token) should redirect with error=invalid_token, got: {}",
        location2
    );
}

// ── GET /me ──────────────────────────────────────────────────────────────

#[tokio::test]
async fn me_with_valid_session_returns_user_data() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (user_id, session_token) = app.create_authenticated_user("me-ok@example.com").await;

    let (status, body) = app
        .get_with_session("/api/v1/auth/me", &session_token)
        .await;

    assert_eq!(status, StatusCode::OK, "GET /me with session should return 200");
    assert_eq!(
        body["email"], "me-ok@example.com",
        "Response should contain the user's email"
    );
    assert_eq!(
        body["id"],
        user_id.to_string(),
        "Response should contain the user's UUID"
    );
    assert_eq!(body["role"], "user", "Default role should be 'user'");
}

#[tokio::test]
async fn me_without_session_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (status, body) = app.get("/api/v1/auth/me").await;

    assert_eq!(
        status,
        StatusCode::UNAUTHORIZED,
        "GET /me without session should return 401"
    );
    assert_eq!(body["error"], "unauthorized");
}

// ── Logout ───────────────────────────────────────────────────────────────

#[tokio::test]
async fn logout_invalidates_session() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session_token) = app
        .create_authenticated_user("logout-test@example.com")
        .await;

    // Verify session works before logout
    let (status, _) = app
        .get_with_session("/api/v1/auth/me", &session_token)
        .await;
    assert_eq!(
        status,
        StatusCode::OK,
        "Session should be valid before logout"
    );

    // Logout
    let (logout_status, logout_body) = app
        .post_with_session(
            "/api/v1/auth/logout",
            &serde_json::json!({}),
            &session_token,
        )
        .await;
    assert_eq!(logout_status, StatusCode::OK, "Logout should return 200");
    assert_eq!(logout_body["message"], "Logged out");

    // After logout, /me should return 401
    let (status_after, body_after) = app
        .get_with_session("/api/v1/auth/me", &session_token)
        .await;
    assert_eq!(
        status_after,
        StatusCode::UNAUTHORIZED,
        "GET /me after logout should return 401"
    );
    assert_eq!(body_after["error"], "unauthorized");
}

#[tokio::test]
async fn logout_clears_cookie() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session_token) = app
        .create_authenticated_user("logout-cookie@example.com")
        .await;

    // Logout via raw request to inspect response headers
    let req = Request::builder()
        .method(Method::POST)
        .uri("/api/v1/auth/logout")
        .header("Content-Type", "application/json")
        .header("X-Requested-With", "XMLHttpRequest")
        .header(
            "Cookie",
            format!("ai_synth_session={}", session_token),
        )
        .body(Body::empty())
        .unwrap();

    let response = app.raw_request(req).await;
    assert_eq!(response.status(), StatusCode::OK);

    let set_cookie = response
        .headers()
        .get("set-cookie")
        .map(|v| v.to_str().unwrap_or(""))
        .unwrap_or("");
    assert!(
        set_cookie.contains("Max-Age=0"),
        "Logout should clear the cookie with Max-Age=0, got: {}",
        set_cookie
    );
}

// ── Edge cases ───────────────────────────────────────────────────────────

#[tokio::test]
async fn me_with_invalid_session_token_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (status, body) = app
        .get_with_session("/api/v1/auth/me", "completely-bogus-session-token")
        .await;

    assert_eq!(
        status,
        StatusCode::UNAUTHORIZED,
        "GET /me with invalid session should return 401"
    );
    assert_eq!(body["error"], "unauthorized");
}

#[tokio::test]
async fn register_then_verify_full_flow() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // Step 1: Register
    let (reg_status, _) = app.register_user_via_api("fullflow@example.com").await;
    assert_eq!(reg_status, StatusCode::OK);

    // Step 2: Create a magic link (simulate what registration did internally)
    let raw_token = app
        .create_magic_link_for_email("fullflow@example.com")
        .await
        .expect("Should create magic link");

    // Step 3: Verify
    let uri = format!("/api/v1/auth/verify?token={}", raw_token);
    let req = Request::builder()
        .method(Method::GET)
        .uri(&uri)
        .body(Body::empty())
        .unwrap();
    let response = app.raw_request(req).await;
    assert!(response.status().is_redirection());

    // Extract session cookie from Set-Cookie header
    let set_cookie = response
        .headers()
        .get("set-cookie")
        .map(|v| v.to_str().unwrap_or(""))
        .unwrap_or("");
    let session_token = set_cookie
        .split(';')
        .next()
        .unwrap_or("")
        .strip_prefix("ai_synth_session=")
        .expect("Should have session cookie");

    // Step 4: Use the session to call /me
    let (me_status, me_body) = app
        .get_with_session("/api/v1/auth/me", session_token)
        .await;
    assert_eq!(me_status, StatusCode::OK);
    assert_eq!(me_body["email"], "fullflow@example.com");
}