//! Integration tests for embed capture + thread hydration.
//!
//! These exercise the AppView's `embed` storage and the new
//! `/api/post/{uri}` thread-hydration endpoint end-to-end:
//!
//! - `timeline_includes_embed` — seed a post with an image embed, query
//!   the home timeline, verify the embed came back as raw JSON.
//! - `timeline_includes_external_embed` — same but with a link card.
//! - `post_endpoint_returns_thread` — seed 3 posts (root + reply + reply
//!   to reply), fetch the middle one's URI, verify the thread
//!   hydration returns the right parent + root rows.
//!
//! Like the sibling API tests these are fail-open: if the AppView
//! service isn't running on the expected port the test prints a notice
//! and returns rather than panicking. The point of the tests is to
//! catch regressions in CI where the service IS up.

use serde_json::{json, Value};
use std::time::Duration;

const APPVIEW_URL: &str = "http://127.0.0.1:2584";

async fn client() -> reqwest::Client {
    reqwest::Client::builder()
        .timeout(Duration::from_secs(5))
        .build()
        .unwrap()
}

async fn wait_for_appview_db() -> bool {
    let c = client().await;
    for _ in 0..20 {
        if let Ok(r) = c.get(format!("{APPVIEW_URL}/healthz")).send().await {
            if r.status().is_success() {
                return true;
            }
        }
        tokio::time::sleep(Duration::from_millis(250)).await;
    }
    false
}

async fn db_reachable() -> bool {
    let Some(url) = std::env::var("DATABASE_URL_APPVIEW").ok() else {
        return false;
    };
    matches!(
        tokio::time::timeout(Duration::from_secs(2), sqlx::PgPool::connect(&url)).await,
        Ok(Ok(_))
    )
}

async fn post_ingest(c: &reqwest::Client, body: Value) -> reqwest::Response {
    c.post(format!("{APPVIEW_URL}/internal/ingest-commit"))
        .json(&body)
        .send()
        .await
        .unwrap()
}

fn did_for_test(prefix: &str) -> String {
    format!(
        "did:plc:emb_{}_{}",
        prefix,
        uuid::Uuid::new_v4().simple()
    )
}

fn rkey() -> String {
    uuid::Uuid::new_v4().simple().to_string()
}

/// Seed a single post with the given record payload and return its URI.
async fn seed_post(c: &reqwest::Client, did: &str, record: Value) -> String {
    let rk = rkey();
    let uri = format!("at://{did}/app.twi.post/{rk}");
    let resp = post_ingest(
        c,
        json!({
            "did": did,
            "collection": "app.twi.post",
            "action": "create",
            "rkey": rk,
            "cid": "bafyreicid",
            "record": record,
        }),
    )
    .await;
    assert_eq!(resp.status().as_u16(), 200, "ingest failed: {record}");
    uri
}

/// Seed a post whose parent/root URIs are given explicitly. Used by
/// the thread test to build a 3-deep chain (root → reply → reply).
async fn seed_reply(
    c: &reqwest::Client,
    did: &str,
    text: &str,
    parent_uri: &str,
    root_uri: &str,
) -> String {
    seed_post(
        c,
        did,
        json!({
            "text": text,
            "createdAt": "2026-07-01T12:00:00Z",
            "reply": {
                "parent": {"uri": parent_uri, "cid": "cp"},
                "root":   {"uri": root_uri, "cid": "cr"}
            }
        }),
    )
    .await
}

#[tokio::test]
async fn timeline_includes_embed() {
    if !wait_for_appview_db().await {
        eprintln!("appview not running, skipping");
        return;
    }
    if !db_reachable().await {
        eprintln!("appview DB unreachable, skipping");
        return;
    }
    let c = client().await;
    let did = did_for_test("img");
    let uri = seed_post(
        &c,
        &did,
        json!({
            "text": "look at this image",
            "createdAt": "2026-07-01T12:00:00Z",
            "embed": {
                "$type": "app.bsky.embed.images",
                "images": [
                    {
                        "alt": "a sunset over mountains",
                        "image": {
                            "$type": "blob",
                            "ref": {"$link": "bafyreimgres1"},
                            "mimeType": "image/jpeg",
                            "size": 12345
                        },
                        "aspectRatio": {"width": 1200, "height": 800}
                    },
                    {
                        "alt": "second image",
                        "image": {
                            "$type": "blob",
                            "ref": {"$link": "bafyreimgres2"},
                            "mimeType": "image/jpeg",
                            "size": 6789
                        }
                    }
                ]
            }
        }),
    )
    .await;

    let resp = c
        .get(format!("{APPVIEW_URL}/api/timeline/home"))
        .query(&[("did", did.as_str()), ("limit", "10")])
        .send()
        .await
        .unwrap();
    assert_eq!(resp.status().as_u16(), 200);
    let body: Value = resp.json().await.unwrap();
    let posts = body["posts"].as_array().unwrap();

    let our = posts
        .iter()
        .find(|p| p["uri"] == json!(uri))
        .expect("seeded post missing from timeline");

    let embed = our
        .get("embed")
        .expect("embed field missing from PostRow");
    assert!(!embed.is_null(), "embed must not be null for image post");
    assert_eq!(embed["$type"], "app.bsky.embed.images");
    let imgs = embed["images"].as_array().expect("images array");
    assert_eq!(imgs.len(), 2);
    assert_eq!(imgs[0]["alt"], "a sunset over mountains");
    assert_eq!(imgs[0]["image"]["ref"]["$link"], "bafyreimgres1");
    assert_eq!(imgs[0]["aspectRatio"]["width"], 1200);
    assert_eq!(imgs[1]["alt"], "second image");
}

#[tokio::test]
async fn timeline_includes_external_embed() {
    if !wait_for_appview_db().await {
        eprintln!("appview not running, skipping");
        return;
    }
    if !db_reachable().await {
        eprintln!("appview DB unreachable, skipping");
        return;
    }
    let c = client().await;
    let did = did_for_test("ext");
    let uri = seed_post(
        &c,
        &did,
        json!({
            "text": "see link",
            "createdAt": "2026-07-01T12:00:00Z",
            "embed": {
                "$type": "app.bsky.embed.external",
                "external": {
                    "uri": "https://example.com/article",
                    "title": "An interesting article",
                    "description": "A short description of the linked page.",
                    "thumb": {
                        "$type": "blob",
                        "ref": {"$link": "bafyreithumb"}
                    }
                }
            }
        }),
    )
    .await;

    let resp = c
        .get(format!("{APPVIEW_URL}/api/timeline/home"))
        .query(&[("did", did.as_str()), ("limit", "10")])
        .send()
        .await
        .unwrap();
    assert_eq!(resp.status().as_u16(), 200);
    let body: Value = resp.json().await.unwrap();
    let posts = body["posts"].as_array().unwrap();

    // The ingest endpoint commits asynchronously; the timeline may
    // not yet contain the row on the first poll. Retry briefly with
    // a 50ms back-off so we don't flake on busy CI.
    let mut our = posts.iter().find(|p| p["uri"] == json!(uri)).cloned();
    for _ in 0..10 {
        if our.is_some() {
            break;
        }
        tokio::time::sleep(Duration::from_millis(50)).await;
        let resp = c
            .get(format!("{APPVIEW_URL}/api/timeline/home"))
            .query(&[("did", did.as_str()), ("limit", "10")])
            .send()
            .await
            .unwrap();
        let body: Value = resp.json().await.unwrap();
        our = body["posts"]
            .as_array()
            .unwrap()
            .iter()
            .find(|p| p["uri"] == json!(uri))
            .cloned();
    }
    let our = our.expect("seeded post missing from timeline");
    let embed = our["embed"].as_object().expect("embed object");
    assert_eq!(embed["$type"], "app.bsky.embed.external");
    assert_eq!(embed["external"]["uri"], "https://example.com/article");
    assert_eq!(embed["external"]["title"], "An interesting article");
}

#[tokio::test]
async fn post_endpoint_returns_thread() {
    if !wait_for_appview_db().await {
        eprintln!("appview not running, skipping");
        return;
    }
    if !db_reachable().await {
        eprintln!("appview DB unreachable, skipping");
        return;
    }
    let c = client().await;
    let alice = did_for_test("thread_alice");
    let bob = did_for_test("thread_bob");
    let carol = did_for_test("thread_carol");

    // Build the chain: root (alice) → reply (bob) → reply to reply (carol).
    let root_uri = seed_post(
        &c,
        &alice,
        json!({
            "text": "alice's root post",
            "createdAt": "2026-07-01T12:00:00Z"
        }),
    )
    .await;
    let reply1_uri = seed_reply(
        &c,
        &bob,
        "bob's reply to alice",
        &root_uri,
        &root_uri,
    )
    .await;
    let reply2_uri = seed_reply(
        &c,
        &carol,
        "carol's reply to bob",
        &reply1_uri,
        &root_uri,
    )
    .await;

    // Fetch carol's post and verify the thread hydration returns both
    // bob's reply (parent) and alice's root (root).
    let resp = c
        .get(format!("{APPVIEW_URL}/api/post/{reply2_uri}"))
        .send()
        .await
        .unwrap();
    assert_eq!(resp.status().as_u16(), 200);
    let body: Value = resp.json().await.unwrap();
    assert_eq!(body["post"]["uri"], json!(reply2_uri));
    assert_eq!(
        body["post"]["text"],
        json!("carol's reply to bob")
    );

    let parent = &body["thread"]["parent"];
    let root = &body["thread"]["root"];
    assert_eq!(parent["uri"], json!(reply1_uri));
    assert_eq!(parent["text"], json!("bob's reply to alice"));
    assert_eq!(root["uri"], json!(root_uri));
    assert_eq!(root["text"], json!("alice's root post"));

    // Reply → reply case: carol's `parent_uri` is bob's, `root_uri` is
    // alice's, and they must differ — so the root field must NOT be
    // collapsed into the parent field.
    assert_ne!(
        parent["uri"], root["uri"],
        "root and parent must be distinct rows for a 2-deep reply chain"
    );
}

#[tokio::test]
async fn post_endpoint_single_post_thread_self_referential() {
    if !wait_for_appview_db().await {
        eprintln!("appview not running, skipping");
        return;
    }
    if !db_reachable().await {
        eprintln!("appview DB unreachable, skipping");
        return;
    }
    let c = client().await;
    let did = did_for_test("self");
    let uri = seed_post(
        &c,
        &did,
        json!({
            "text": "standalone post, no parent",
            "createdAt": "2026-07-01T12:00:00Z"
        }),
    )
    .await;

    let resp = c
        .get(format!("{APPVIEW_URL}/api/post/{uri}"))
        .send()
        .await
        .unwrap();
    assert_eq!(resp.status().as_u16(), 200);
    let body: Value = resp.json().await.unwrap();
    assert_eq!(body["post"]["uri"], json!(uri));
    assert!(
        body["thread"]["parent"].is_null(),
        "post with no parent must have null parent"
    );
    assert!(
        body["thread"]["root"].is_null(),
        "post with no parent must have null root"
    );
}

#[tokio::test]
async fn post_endpoint_unknown_uri_returns_null_post() {
    if !wait_for_appview_db().await {
        eprintln!("appview not running, skipping");
        return;
    }
    let c = client().await;
    let bogus = format!(
        "at://did:plc:nope-{}/app.twi.post/nope-{}",
        uuid::Uuid::new_v4().simple(),
        uuid::Uuid::new_v4().simple()
    );
    let resp = c
        .get(format!("{APPVIEW_URL}/api/post/{bogus}"))
        .send()
        .await
        .unwrap();
    assert_eq!(resp.status().as_u16(), 200);
    let body: Value = resp.json().await.unwrap();
    assert!(body["post"].is_null());
    assert!(body["thread"]["parent"].is_null());
    assert!(body["thread"]["root"].is_null());
}

#[tokio::test]
async fn timeline_post_without_embed_has_null_embed() {
    if !wait_for_appview_db().await {
        eprintln!("appview not running, skipping");
        return;
    }
    if !db_reachable().await {
        eprintln!("appview DB unreachable, skipping");
        return;
    }
    let c = client().await;
    let did = did_for_test("plain");
    let uri = seed_post(
        &c,
        &did,
        json!({
            "text": "plain text only",
            "createdAt": "2026-07-01T12:00:00Z"
        }),
    )
    .await;

    let resp = c
        .get(format!("{APPVIEW_URL}/api/timeline/home"))
        .query(&[("did", did.as_str()), ("limit", "10")])
        .send()
        .await
        .unwrap();
    assert_eq!(resp.status().as_u16(), 200);
    let body: Value = resp.json().await.unwrap();
    let our = body["posts"]
        .as_array()
        .unwrap()
        .iter()
        .find(|p| p["uri"] == json!(uri))
        .expect("plain post missing");
    assert!(
        our["embed"].is_null(),
        "plain text post must have null embed, got: {}",
        our["embed"]
    );
}