//! End-to-end integration tests that connect to a real Chrome instance and
//! verify that goto_with_html_once correctly injects HTML without deadlocking.
//!
//! Requires: Chrome running with --remote-debugging-port=9222
//! Run: CHROME_URL=ws://127.0.0.1:9222 cargo test -p spider --test chrome_intercept_e2e --features "chrome chrome_intercept smart"

#[cfg(feature = "chrome")]
mod e2e {
    use spider::tokio;
    use spider::website::Website;
    use std::time::Duration;

    /// Get the full devtools WS URL from a local Chrome instance.
    /// `Browser::connect_with_config` requires the full path (e.g.
    /// ws://host:port/devtools/browser/UUID), not just ws://host:port.
    async fn chrome_url() -> Option<String> {
        if std::net::TcpStream::connect("127.0.0.1:9222").is_err() {
            return None;
        }
        let resp = spider::reqwest::get("http://127.0.0.1:9222/json/version")
            .await
            .ok()?;
        let json: serde_json::Value = resp.json().await.ok()?;
        json["webSocketDebuggerUrl"].as_str().map(String::from)
    }

    /// Basic Chrome crawl without chrome_intercept features — the common path.
    #[tokio::test]
    async fn basic_chrome_crawl() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at port 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_limit(1)
            .with_request_timeout(Some(Duration::from_secs(30)))
            .build()
            .unwrap();

        let mut rx = website.subscribe(16);
        let collector = tokio::spawn(async move {
            let mut pages = vec![];
            while let Ok(page) = rx.recv().await {
                pages.push((page.get_url().to_string(), page.get_html().len()));
            }
            pages
        });

        let start = std::time::Instant::now();
        website.crawl().await;
        website.unsubscribe();
        let elapsed = start.elapsed();

        let pages = collector.await.unwrap();
        eprintln!("basic_chrome_crawl: {} pages in {:?}", pages.len(), elapsed);

        assert!(!pages.is_empty(), "Should have crawled at least 1 page");
        assert!(
            pages[0].1 > 100,
            "Page should have content ({} bytes)",
            pages[0].1
        );
        assert!(
            elapsed < Duration::from_secs(45),
            "Should not deadlock ({:?})",
            elapsed
        );
    }

    /// Chrome crawl with chrome_intercept — resource blocking active.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn chrome_intercept_crawl() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at port 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_limit(1)
            .with_request_timeout(Some(Duration::from_secs(30)))
            .build()
            .unwrap();

        let mut rx = website.subscribe(16);
        let collector = tokio::spawn(async move {
            let mut pages = vec![];
            while let Ok(page) = rx.recv().await {
                pages.push((page.get_url().to_string(), page.get_html().len()));
            }
            pages
        });

        let start = std::time::Instant::now();
        website.crawl().await;
        website.unsubscribe();
        let elapsed = start.elapsed();

        let pages = collector.await.unwrap();
        eprintln!(
            "chrome_intercept_crawl: {} pages in {:?}",
            pages.len(),
            elapsed
        );

        assert!(!pages.is_empty(), "Should have crawled at least 1 page");
        assert!(
            pages[0].1 > 100,
            "Page should have content ({} bytes)",
            pages[0].1
        );
        assert!(
            elapsed < Duration::from_secs(45),
            "Should not deadlock ({:?})",
            elapsed
        );
    }

    /// Multiple concurrent pages with chrome_intercept — most likely to trigger blocking.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn chrome_intercept_concurrent() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at port 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_depth(1)
            .with_limit(4)
            .with_request_timeout(Some(Duration::from_secs(30)))
            .build()
            .unwrap();

        let mut rx = website.subscribe(32);
        let collector = tokio::spawn(async move {
            let mut count = 0usize;
            while let Ok(_page) = rx.recv().await {
                count += 1;
            }
            count
        });

        let start = std::time::Instant::now();
        website.crawl().await;
        website.unsubscribe();
        let elapsed = start.elapsed();

        let count = collector.await.unwrap();
        eprintln!(
            "chrome_intercept_concurrent: {} pages in {:?}",
            count, elapsed
        );

        assert!(count >= 1, "Should have visited at least 1 page");
        assert!(
            elapsed < Duration::from_secs(60),
            "No deadlock ({:?})",
            elapsed
        );
    }

    /// Smart mode — HTTP first, Chrome upgrade for JS content.
    #[cfg(feature = "smart")]
    #[tokio::test]
    async fn smart_mode_crawl() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at port 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_limit(1)
            .with_request_timeout(Some(Duration::from_secs(30)))
            .build()
            .unwrap();

        let mut rx = website.subscribe(16);
        let collector = tokio::spawn(async move {
            let mut pages = vec![];
            while let Ok(page) = rx.recv().await {
                pages.push((page.get_url().to_string(), page.get_html().len()));
            }
            pages
        });

        let start = std::time::Instant::now();
        website.crawl_smart().await;
        website.unsubscribe();
        let elapsed = start.elapsed();

        let pages = collector.await.unwrap();
        eprintln!("smart_mode: {} pages in {:?}", pages.len(), elapsed);

        assert!(!pages.is_empty(), "Should have crawled at least 1 page");
        assert!(
            elapsed < Duration::from_secs(60),
            "No deadlock ({:?})",
            elapsed
        );
    }

    /// Verify the seeded content path (goto_with_html_once) doesn't deadlock.
    /// Crawl twice: first populates cache, second uses cached content.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn seeded_content_no_deadlock() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at port 9222");
            return;
        };

        // First crawl — populates pages
        let mut website1 = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.clone().into()))
            .with_limit(1)
            .with_caching(true)
            .with_request_timeout(Some(Duration::from_secs(30)))
            .build()
            .unwrap();

        let mut rx1 = website1.subscribe(16);
        let c1 = tokio::spawn(async move {
            let mut n = 0usize;
            while let Ok(_) = rx1.recv().await {
                n += 1;
            }
            n
        });

        website1.crawl().await;
        website1.unsubscribe();
        let n1 = c1.await.unwrap();
        eprintln!("seeded_content first crawl: {} pages", n1);

        // Second crawl — should use cached content (goto_with_html_once path)
        let mut website2 = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_limit(1)
            .with_caching(true)
            .with_request_timeout(Some(Duration::from_secs(30)))
            .build()
            .unwrap();

        let mut rx2 = website2.subscribe(16);
        let c2 = tokio::spawn(async move {
            let mut n = 0usize;
            while let Ok(_) = rx2.recv().await {
                n += 1;
            }
            n
        });

        let start = std::time::Instant::now();
        website2.crawl().await;
        website2.unsubscribe();
        let elapsed = start.elapsed();
        let n2 = c2.await.unwrap();

        eprintln!("seeded_content second crawl: {} pages in {:?}", n2, elapsed);
        assert!(
            elapsed < Duration::from_secs(45),
            "Second crawl (cached path) deadlocked: {:?}",
            elapsed
        );
    }

    /// High concurrency — 8 concurrent pages, depth 2.
    /// Tests that semaphore permits are returned, tabs are cleaned up,
    /// and the handler doesn't get overwhelmed.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn high_concurrency_no_deadlock() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_depth(2)
            .with_limit(8)
            .with_request_timeout(Some(Duration::from_secs(15)))
            .build()
            .unwrap();

        let mut rx = website.subscribe(64);
        let collector = tokio::spawn(async move {
            let mut count = 0usize;
            while let Ok(_) = rx.recv().await {
                count += 1;
            }
            count
        });

        let start = std::time::Instant::now();
        website.crawl().await;
        website.unsubscribe();
        let elapsed = start.elapsed();
        let count = collector.await.unwrap();

        eprintln!("high_concurrency: {} pages in {:?}", count, elapsed);
        assert!(count >= 1, "Should crawl at least 1 page");
        assert!(
            elapsed < Duration::from_secs(60),
            "High concurrency crawl should not deadlock ({:?})",
            elapsed
        );
    }

    /// Rapid sequential crawls — reuse the same Chrome instance across
    /// multiple Website instances to test tab cleanup between crawls.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn sequential_crawls_no_accumulation() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at 9222");
            return;
        };

        for i in 0..3 {
            let mut website = Website::new("https://example.com")
                .with_chrome_connection(Some(ws.clone().into()))
                .with_limit(2)
                .with_depth(1)
                .with_request_timeout(Some(Duration::from_secs(15)))
                .build()
                .unwrap();

            let mut rx = website.subscribe(16);
            let collector = tokio::spawn(async move {
                let mut count = 0usize;
                while let Ok(_) = rx.recv().await {
                    count += 1;
                }
                count
            });

            let start = std::time::Instant::now();
            website.crawl().await;
            website.unsubscribe();
            let elapsed = start.elapsed();
            let count = collector.await.unwrap();

            eprintln!(
                "sequential crawl {}: {} pages in {:?}",
                i + 1,
                count,
                elapsed
            );
            assert!(
                elapsed < Duration::from_secs(30),
                "Sequential crawl {} should not degrade ({:?})",
                i + 1,
                elapsed
            );
        }
    }

    /// Budget exhaustion — set a small budget and verify the crawl
    /// completes without hanging when the budget is exceeded.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn budget_exhaustion_completes() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at 9222");
            return;
        };

        let mut budget = spider::hashbrown::HashMap::new();
        budget.insert("*", 1u32); // max 1 page total

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_depth(2)
            .with_limit(4)
            .with_budget(Some(budget))
            .with_request_timeout(Some(Duration::from_secs(15)))
            .build()
            .unwrap();

        let mut rx = website.subscribe(16);
        let collector = tokio::spawn(async move {
            let mut count = 0usize;
            while let Ok(_) = rx.recv().await {
                count += 1;
            }
            count
        });

        let start = std::time::Instant::now();
        website.crawl().await;
        website.unsubscribe();
        let elapsed = start.elapsed();
        let count = collector.await.unwrap();

        eprintln!("budget_exhaustion: {} pages in {:?}", count, elapsed);
        assert!(count <= 2, "Budget should limit pages (got {})", count);
        assert!(
            elapsed < Duration::from_secs(30),
            "Budget exhaustion should not hang ({:?})",
            elapsed
        );
    }

    /// Crawl with timeout — set a very short crawl timeout and verify
    /// it terminates promptly without hanging on cleanup.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn crawl_timeout_terminates() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_depth(3)
            .with_limit(10)
            .with_request_timeout(Some(Duration::from_secs(5)))
            .with_crawl_timeout(Some(Duration::from_secs(5)))
            .build()
            .unwrap();

        let start = std::time::Instant::now();
        website.crawl().await;
        let elapsed = start.elapsed();

        eprintln!("crawl_timeout: completed in {:?}", elapsed);
        assert!(
            elapsed < Duration::from_secs(30),
            "Crawl with 5s timeout should not hang on cleanup ({:?})",
            elapsed
        );
    }

    /// Drop subscriber mid-crawl — verify subscription_guard doesn't hang.
    #[cfg(feature = "chrome_intercept")]
    #[tokio::test]
    async fn dropped_subscriber_no_hang() {
        let Some(ws) = chrome_url().await else {
            eprintln!("SKIP: no Chrome at 9222");
            return;
        };

        let mut website = Website::new("https://example.com")
            .with_chrome_connection(Some(ws.into()))
            .with_limit(1)
            .with_request_timeout(Some(Duration::from_secs(15)))
            .build()
            .unwrap();

        // Subscribe then immediately drop the receiver
        let _rx = website.subscribe(16);
        drop(_rx);

        let start = std::time::Instant::now();
        website.crawl().await;
        let elapsed = start.elapsed();

        eprintln!("dropped_subscriber: completed in {:?}", elapsed);
        assert!(
            elapsed < Duration::from_secs(20),
            "Dropped subscriber should not cause hang ({:?})",
            elapsed
        );
    }
}
