//! Integration tests for the syntheses endpoints (Phase 5).
//!
//! Tests:
//! - GET /api/v1/syntheses — list user's syntheses (paginated)
//! - GET /api/v1/syntheses/:id — get synthesis detail
//! - DELETE /api/v1/syntheses/:id — delete a synthesis
//! - POST /api/v1/syntheses/generate — trigger generation
//!
//! Covers authentication, CRUD, ownership isolation, pagination,
//! and generation trigger behaviour.
//!
//! Requires a running Postgres instance. Set `TEST_DATABASE_URL` to run.

mod common;

use axum::body::Body;
use axum::http::StatusCode;

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

/// Helper: build a sample sections JSON value with one section and two items.
fn sample_sections() -> serde_json::Value {
    serde_json::json!([
        {
            "title": "AI News",
            "items": [
                {
                    "title": "Article 1",
                    "url": "https://example.com/1",
                    "summary": "Summary of article 1"
                },
                {
                    "title": "Article 2",
                    "url": "https://example.com/2",
                    "summary": "Summary of article 2"
                }
            ]
        }
    ])
}

/// Helper: build a multi-section JSON value.
fn multi_sections() -> serde_json::Value {
    serde_json::json!([
        {
            "title": "Major Announcements",
            "items": [
                {
                    "title": "Big Launch",
                    "url": "https://example.com/launch",
                    "summary": "A big product launch"
                }
            ]
        },
        {
            "title": "Research",
            "items": [
                {
                    "title": "New Paper",
                    "url": "https://example.com/paper",
                    "summary": "A new research paper"
                },
                {
                    "title": "Breakthrough",
                    "url": "https://example.com/breakthrough",
                    "summary": "A scientific breakthrough"
                }
            ]
        }
    ])
}

// ═══════════════════════════════════════════════════════════════════════════
// Auth (3 tests)
// ═══════════════════════════════════════════════════════════════════════════

#[tokio::test]
async fn get_syntheses_without_auth_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/syntheses").await;

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

#[tokio::test]
async fn get_synthesis_by_id_without_auth_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let fake_id = uuid::Uuid::new_v4();
    let (status, body) = app
        .get(&format!("/api/v1/syntheses/{}", fake_id))
        .await;

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

#[tokio::test]
async fn delete_synthesis_without_auth_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let fake_id = uuid::Uuid::new_v4();

    // DELETE without session — use raw request to include CSRF header
    let req = axum::http::Request::builder()
        .method(axum::http::Method::DELETE)
        .uri(&format!("/api/v1/syntheses/{}", fake_id))
        .header("X-Requested-With", "XMLHttpRequest")
        .body(axum::body::Body::empty())
        .unwrap();

    let response = app.raw_request(req).await;
    assert_eq!(
        response.status(),
        StatusCode::UNAUTHORIZED,
        "DELETE /syntheses/:id without auth should return 401"
    );
}

// ═══════════════════════════════════════════════════════════════════════════
// CRUD (6 tests)
// ═══════════════════════════════════════════════════════════════════════════

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

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("synth-empty@example.com")
        .await;

    let (status, body) = app
        .get_with_session("/api/v1/syntheses", &session)
        .await;

    assert_eq!(status, StatusCode::OK);
    let items = body["items"].as_array().expect("items should be an array");
    assert!(items.is_empty(), "New user should have no syntheses");
}

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

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-list@example.com")
        .await;

    // Insert a synthesis directly via the helper
    let sections = sample_sections();
    let synth_id = app
        .insert_test_synthesis(user_id, "2026-W12", &sections)
        .await;

    let (status, body) = app
        .get_with_session("/api/v1/syntheses", &session)
        .await;

    assert_eq!(status, StatusCode::OK);
    let items = body["items"].as_array().expect("items array");
    assert_eq!(items.len(), 1, "Should have exactly 1 synthesis");

    let item = &items[0];
    assert_eq!(item["id"], synth_id.to_string());
    assert_eq!(item["week"], "2026-W12");
    assert_eq!(item["status"], "completed");
    // first_section_title should be "AI News"
    assert_eq!(item["first_section_title"], "AI News");
    assert_eq!(item["first_section_item_count"], 2);
}

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

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-detail@example.com")
        .await;

    let sections = multi_sections();
    let synth_id = app
        .insert_test_synthesis(user_id, "2026-W11", &sections)
        .await;

    let (status, body) = app
        .get_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session)
        .await;

    assert_eq!(status, StatusCode::OK);
    assert_eq!(body["id"], synth_id.to_string());
    assert_eq!(body["week"], "2026-W11");
    assert_eq!(body["status"], "completed");

    let resp_sections = body["sections"].as_array().expect("sections array");
    assert_eq!(resp_sections.len(), 2);
    assert_eq!(resp_sections[0]["title"], "Major Announcements");
    assert_eq!(
        resp_sections[0]["items"].as_array().unwrap().len(),
        1
    );
    assert_eq!(resp_sections[1]["title"], "Research");
    assert_eq!(
        resp_sections[1]["items"].as_array().unwrap().len(),
        2
    );

    // Verify nested item details
    let first_item = &resp_sections[0]["items"][0];
    assert_eq!(first_item["title"], "Big Launch");
    assert_eq!(first_item["url"], "https://example.com/launch");
    assert_eq!(first_item["summary"], "A big product launch");
}

#[tokio::test]
async fn get_synthesis_nonexistent_returns_404() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("synth-404@example.com")
        .await;

    let fake_id = uuid::Uuid::new_v4();
    let (status, body) = app
        .get_with_session(&format!("/api/v1/syntheses/{}", fake_id), &session)
        .await;

    assert_eq!(
        status,
        StatusCode::NOT_FOUND,
        "Non-existent synthesis should return 404"
    );
    assert_eq!(body["error"], "not_found");
}

#[tokio::test]
async fn delete_synthesis_returns_204() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-delete@example.com")
        .await;

    let sections = sample_sections();
    let synth_id = app
        .insert_test_synthesis(user_id, "2026-W12", &sections)
        .await;

    let (status, _) = app
        .delete_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session)
        .await;

    assert_eq!(
        status,
        StatusCode::NO_CONTENT,
        "DELETE /syntheses/:id should return 204"
    );
}

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

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-del-list@example.com")
        .await;

    let sections = sample_sections();
    let synth_id = app
        .insert_test_synthesis(user_id, "2026-W12", &sections)
        .await;

    // Delete it
    let (del_status, _) = app
        .delete_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session)
        .await;
    assert_eq!(del_status, StatusCode::NO_CONTENT);

    // List should be empty now
    let (status, body) = app
        .get_with_session("/api/v1/syntheses", &session)
        .await;
    assert_eq!(status, StatusCode::OK);
    let items = body["items"].as_array().expect("items array");
    assert!(items.is_empty(), "After deletion, list should be empty");

    // GET by id should also 404
    let (get_status, get_body) = app
        .get_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session)
        .await;
    assert_eq!(get_status, StatusCode::NOT_FOUND);
    assert_eq!(get_body["error"], "not_found");
}

// ═══════════════════════════════════════════════════════════════════════════
// Ownership Isolation (2 tests)
// ═══════════════════════════════════════════════════════════════════════════

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

    let app = common::TestApp::new().await;
    let (user_a_id, session_a) = app
        .create_authenticated_user("synth-owner-a@example.com")
        .await;
    let (_user_b_id, session_b) = app
        .create_authenticated_user("synth-owner-b@example.com")
        .await;

    // Insert a synthesis for User A
    let sections = sample_sections();
    let synth_id = app
        .insert_test_synthesis(user_a_id, "2026-W12", &sections)
        .await;

    // User B lists syntheses — should be empty
    let (status_b, body_b) = app
        .get_with_session("/api/v1/syntheses", &session_b)
        .await;
    assert_eq!(status_b, StatusCode::OK);
    let items_b = body_b["items"].as_array().expect("items array");
    assert!(
        items_b.is_empty(),
        "User B should not see User A's syntheses"
    );

    // User B tries to access User A's synthesis by ID — should 404
    let (get_status, get_body) = app
        .get_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session_b)
        .await;
    assert_eq!(
        get_status,
        StatusCode::NOT_FOUND,
        "User B should not access User A's synthesis"
    );
    assert_eq!(get_body["error"], "not_found");

    // User A can still see their synthesis
    let (status_a, body_a) = app
        .get_with_session("/api/v1/syntheses", &session_a)
        .await;
    assert_eq!(status_a, StatusCode::OK);
    let items_a = body_a["items"].as_array().expect("items array");
    assert_eq!(items_a.len(), 1);
}

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

    let app = common::TestApp::new().await;
    let (user_a_id, session_a) = app
        .create_authenticated_user("synth-del-a@example.com")
        .await;
    let (_user_b_id, session_b) = app
        .create_authenticated_user("synth-del-b@example.com")
        .await;

    // Insert a synthesis for User A
    let sections = sample_sections();
    let synth_id = app
        .insert_test_synthesis(user_a_id, "2026-W12", &sections)
        .await;

    // User B tries to delete User A's synthesis — should 404
    let (del_status, del_body) = app
        .delete_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session_b)
        .await;
    assert_eq!(
        del_status,
        StatusCode::NOT_FOUND,
        "User B should not be able to delete User A's synthesis"
    );
    assert_eq!(del_body["error"], "not_found");

    // User A's synthesis should still exist
    let (get_status, _) = app
        .get_with_session(&format!("/api/v1/syntheses/{}", synth_id), &session_a)
        .await;
    assert_eq!(
        get_status,
        StatusCode::OK,
        "User A's synthesis should still exist after User B's delete attempt"
    );
}

// ═══════════════════════════════════════════════════════════════════════════
// Pagination (2 tests)
// ═══════════════════════════════════════════════════════════════════════════

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

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-limit@example.com")
        .await;

    // Insert 3 syntheses
    let sections = sample_sections();
    for week in &["2026-W10", "2026-W11", "2026-W12"] {
        app.insert_test_synthesis(user_id, week, &sections).await;
    }

    // Request with limit=2
    let (status, body) = app
        .get_with_session("/api/v1/syntheses?limit=2", &session)
        .await;

    assert_eq!(status, StatusCode::OK);
    let items = body["items"].as_array().expect("items array");
    assert_eq!(
        items.len(),
        2,
        "limit=2 should return at most 2 syntheses"
    );
}

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

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-offset@example.com")
        .await;

    // Insert 3 syntheses (created in order, newest-first in response)
    let sections = sample_sections();
    for week in &["2026-W10", "2026-W11", "2026-W12"] {
        app.insert_test_synthesis(user_id, week, &sections).await;
        // Small delay to ensure different created_at timestamps
        tokio::time::sleep(std::time::Duration::from_millis(10)).await;
    }

    // Get all to see the order
    let (_, all_body) = app
        .get_with_session("/api/v1/syntheses", &session)
        .await;
    let all_items = all_body["items"].as_array().unwrap();
    assert_eq!(all_items.len(), 3);

    // Get with offset=1 — should skip the first (newest)
    let (status, body) = app
        .get_with_session("/api/v1/syntheses?offset=1", &session)
        .await;

    assert_eq!(status, StatusCode::OK);
    let items = body["items"].as_array().expect("items array");
    assert_eq!(items.len(), 2, "offset=1 should skip 1 and return 2");

    // The first item in the offset response should match the second in the full list
    assert_eq!(items[0]["id"], all_items[1]["id"]);
}

// ═══════════════════════════════════════════════════════════════════════════
// Generation Trigger (3 tests)
// ═══════════════════════════════════════════════════════════════════════════

#[tokio::test]
async fn generate_without_auth_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let body = serde_json::json!({});
    let (status, resp) = app.post("/api/v1/syntheses/generate", &body).await;

    assert_eq!(
        status,
        StatusCode::UNAUTHORIZED,
        "POST /syntheses/generate without auth should return 401"
    );
    assert_eq!(resp["error"], "unauthorized");
}

#[tokio::test]
async fn generate_returns_202_with_job_id() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("synth-gen@example.com")
        .await;

    let body = serde_json::json!({});
    let (status, resp) = app
        .post_with_session("/api/v1/syntheses/generate", &body, &session)
        .await;

    assert_eq!(
        status,
        StatusCode::ACCEPTED,
        "POST /syntheses/generate should return 202 Accepted"
    );
    // Response should contain a job_id (UUID)
    let job_id = resp["job_id"].as_str().expect("job_id should be a string");
    assert!(
        uuid::Uuid::parse_str(job_id).is_ok(),
        "job_id should be a valid UUID"
    );
    assert!(
        resp["message"].as_str().is_some(),
        "Response should contain a message"
    );
}

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

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("synth-gen-dup@example.com")
        .await;

    let body = serde_json::json!({});

    // First call should succeed with 202
    let (status1, resp1) = app
        .post_with_session("/api/v1/syntheses/generate", &body, &session)
        .await;
    assert_eq!(status1, StatusCode::ACCEPTED);
    assert!(resp1["job_id"].as_str().is_some());

    // Second call should fail — one job at a time
    let (status2, resp2) = app
        .post_with_session("/api/v1/syntheses/generate", &body, &session)
        .await;
    assert_eq!(
        status2,
        StatusCode::BAD_REQUEST,
        "Second generate call should be rejected while one is in progress"
    );
    assert_eq!(resp2["error"], "bad_request");
}

// ═══════════════════════════════════════════════════════════════════════════
// Generation Pipeline — Model Resolution
// ═══════════════════════════════════════════════════════════════════════════

/// Verify that triggering generation with a configured provider exercises
/// the model resolution SQL query against the real database schema.
/// The generation will fail at the LLM call (fake API key), but that confirms
/// settings load, model resolution, provider creation, and schema building
/// all succeed — which is the code path that had the admin_provider_models bug.
#[tokio::test]
async fn generate_pipeline_resolves_model_from_admin_config() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (user_id, session) = app
        .create_authenticated_user("synth-model-resolve@example.com")
        .await;

    // Configure user settings with provider and categories
    let settings = serde_json::json!({
        "categories": ["Test Category"],
        "ai_provider": "openai",
        "ai_model": "",
        "ai_model_writing": "",
        "use_llm_for_source_links": false,
        "use_llm_for_article_extraction": false,
        "article_history_days": 90
    });
    let (settings_status, _) = app
        .put_with_session("/api/v1/settings", &settings, &session)
        .await;
    assert_eq!(settings_status, StatusCode::OK, "Settings save should succeed");

    // Store a fake API key — we don't need a real one, just need to get past
    // model resolution and into the LLM call
    let key_body = serde_json::json!({
        "provider_name": "openai",
        "api_key": "sk-fake-test-key-for-model-resolution"
    });
    let (key_status, _) = app
        .post_with_session("/api/v1/user/api-keys", &key_body, &session)
        .await;
    assert_eq!(key_status, StatusCode::OK, "API key store should succeed");

    // Add a source so the pipeline has something to work with
    let source_body = serde_json::json!({
        "title": "Test Source",
        "url": "https://example.com"
    });
    let (source_status, _) = app
        .post_with_session("/api/v1/sources", &source_body, &session)
        .await;
    assert_eq!(source_status, StatusCode::OK, "Source creation should succeed");

    // Trigger generation — this will run async. The key assertion is that
    // the HTTP trigger returns 202 (not 500) and the async job doesn't crash
    // on a database error. It will fail at the LLM API call (fake key), which
    // is expected and fine — the model resolution path was exercised.
    let gen_body = serde_json::json!({});
    let (gen_status, gen_resp) = app
        .post_with_session("/api/v1/syntheses/generate", &gen_body, &session)
        .await;
    assert_eq!(
        gen_status,
        StatusCode::ACCEPTED,
        "Generation trigger should succeed (202)"
    );
    let job_id = gen_resp["job_id"].as_str().expect("should have job_id");

    // Wait briefly for the async job to attempt model resolution and LLM call
    tokio::time::sleep(std::time::Duration::from_secs(3)).await;

    // Poll the progress endpoint — we expect an error from the LLM call (fake key),
    // NOT a database error about a missing table. This confirms model resolution worked.
    let progress_url = format!("/api/v1/syntheses/generate/{}/progress", job_id);
    let req = axum::http::Request::builder()
        .method(axum::http::Method::GET)
        .uri(&progress_url)
        .header("cookie", format!("ai_synth_session={}", session))
        .header("x-requested-with", "XMLHttpRequest")
        .body(Body::empty())
        .unwrap();

    let (_, progress_text, _) = app.raw_request_text(req).await;

    // The SSE stream should NOT contain a database error about a missing table.
    // It should contain an LLM-related error (fake key) instead.
    assert!(
        !progress_text.contains("admin_provider_models"),
        "Generation must not reference non-existent admin_provider_models table. Got: {}",
        progress_text
    );
}