kakeibo/backend/tests/stats.rs

//! Panel verileri: günlük harcama ve dönem istatistikleri (toplam birikim dahil).

mod common;

use axum::http::StatusCode;
use common::{Session, TestApp};
use serde_json::{Value, json};

async fn open(app: &TestApp, s: &Session, start: &str, end: &str, goal: i64) -> String {
    let (st, p) = app
        .post(
            "/periods",
            s,
            json!({ "start_date": start, "end_date": end, "savings_goal": goal }),
        )
        .await;
    assert_eq!(st, StatusCode::CREATED, "{p}");
    p["id"].as_str().unwrap().to_string()
}

async fn category(app: &TestApp, s: &Session, group: &str) -> String {
    let (_, cats) = app.get("/categories", s).await;
    cats.as_array()
        .unwrap()
        .iter()
        .find(|c| c["group"] == group)
        .unwrap()["id"]
        .as_str()
        .unwrap()
        .to_string()
}

async fn spend(app: &TestApp, s: &Session, pid: &str, date: &str, amount: i64, cat: &str) -> Value {
    let (st, e) = app
        .post(
            &format!("/periods/{pid}/entries"),
            s,
            json!({ "date": date, "amount": amount, "category_id": cat }),
        )
        .await;
    assert_eq!(st, StatusCode::CREATED, "{e}");
    e
}

async fn income(app: &TestApp, s: &Session, pid: &str, amount: i64) {
    let (st, b) = app
        .post(
            &format!("/periods/{pid}/plan-items"),
            s,
            json!({ "kind": "income", "name": "Maaş", "amount": amount }),
        )
        .await;
    assert_eq!(st, StatusCode::CREATED, "{b}");
}

/// Kasım: gelir 10.000, harcama 3.000, 5.000 birikime → 2.000 artı Aralık'a.
/// Aralık: gelir 20.000, hedef 1.000 → harcanabilir 21.000.
async fn two_periods(app: &TestApp, s: &Session) -> (String, String) {
    let needs = category(app, s, "needs").await;
    let nov = open(app, s, "2026-11-01", "2026-12-01", 0).await;
    income(app, s, &nov, 1_000_000).await;
    spend(app, s, &nov, "2026-11-30", 300_000, &needs).await;
    let (st, b) = app
        .post(
            &format!("/periods/{nov}/close"),
            s,
            json!({ "to_savings": 500_000 }),
        )
        .await;
    assert_eq!(st, StatusCode::OK, "{b}");
    let dec = open(app, s, "2026-12-01", "2027-01-01", 100_000).await;
    income(app, s, &dec, 2_000_000).await;
    (nov, dec)
}

#[tokio::test]
async fn daily_spending_by_group() {
    let app = TestApp::new().await;
    let s = app.register("Test", None).await;
    let (_, dec) = two_periods(&app, &s).await;
    let needs = category(&app, &s, "needs").await;
    let wants = category(&app, &s, "wants").await;
    spend(&app, &s, &dec, "2026-12-01", 100_000, &needs).await;
    spend(&app, &s, &dec, "2026-12-01", 50_000, &wants).await;
    spend(&app, &s, &dec, "2026-12-07", 20_000, &needs).await;
    spend(&app, &s, &dec, "2026-12-31", 7_000, &needs).await;
    let gone = spend(&app, &s, &dec, "2026-12-02", 99_000, &needs).await;
    let (st, _) = app
        .delete(&format!("/entries/{}", gone["id"].as_str().unwrap()), &s)
        .await;
    assert_eq!(st, StatusCode::NO_CONTENT);

    let (st, days) = app.get(&format!("/periods/{dec}/daily"), &s).await;
    assert_eq!(st, StatusCode::OK, "{days}");
    let days = days.as_array().unwrap();
    assert_eq!(days.len(), 31, "her gün, harcama olmasa da");
    assert_eq!(days[0]["date"], "2026-12-01");
    assert_eq!(
        days[0]["spent"],
        json!({ "needs": 100_000, "wants": 50_000, "culture": 0, "unexpected": 0 })
    );
    assert_eq!(days[1]["spent"]["needs"], 0, "silinen kayıt sayılmaz");
    assert_eq!(days[6]["spent"]["needs"], 20_000);
    assert_eq!(days[30]["date"], "2026-12-31");
    assert_eq!(days[30]["spent"]["needs"], 7_000, "son gün dahil");
    // Kasım'ın 30.11 harcaması Aralık'a karışmaz
    let total: i64 = days
        .iter()
        .map(|d| d["spent"]["needs"].as_i64().unwrap())
        .sum();
    assert_eq!(total, 127_000);

    // Başka hane göremez
    let other = app.register("Diger", None).await;
    let (st, _) = app.get(&format!("/periods/{dec}/daily"), &other).await;
    assert_eq!(st, StatusCode::NOT_FOUND);
    app.cleanup().await;
}

#[tokio::test]
async fn period_stats_and_total_savings() {
    let app = TestApp::new().await;
    let s = app.register("Test", None).await;
    let (nov, dec) = two_periods(&app, &s).await;
    let needs = category(&app, &s, "needs").await;
    let culture = category(&app, &s, "culture").await;
    spend(&app, &s, &dec, "2026-12-05", 40_000, &needs).await;
    spend(&app, &s, &dec, "2026-12-06", 2_500, &culture).await;

    let (st, b) = app.get("/stats/periods", &s).await;
    assert_eq!(st, StatusCode::OK, "{b}");
    assert_eq!(b["total_saved"], 500_000);
    let list = b["periods"].as_array().unwrap();
    assert_eq!(list.len(), 2);
    // Eskiden yeniye
    assert_eq!(list[0]["id"], nov.as_str());
    assert_eq!(list[0]["status"], "closed");
    assert_eq!(list[0]["spendable"], 1_000_000);
    assert_eq!(list[0]["spent"], 300_000);
    assert_eq!(
        list[0]["spent_by_group"],
        json!({ "needs": 300_000, "wants": 0, "culture": 0, "unexpected": 0 })
    );
    assert_eq!(list[0]["to_savings"], 500_000);
    assert_eq!(list[0]["last_date"], "2026-11-30");
    assert_eq!(list[1]["id"], dec.as_str());
    assert_eq!(
        list[1]["spendable"], 2_100_000,
        "20.000 − 1.000 hedef + 2.000 artı"
    );
    assert_eq!(list[1]["spent"], 42_500);
    assert_eq!(list[1]["spent_by_group"]["needs"], 40_000);
    assert_eq!(list[1]["spent_by_group"]["culture"], 2_500);
    assert_eq!(list[1]["income_total"], 2_000_000);
    assert_eq!(list[1]["savings_goal"], 100_000);
    assert_eq!(list[1]["carryover_surplus"], 200_000);
    assert_eq!(
        list[0]["realized_savings"], 700_000,
        "Kasım: 10.000 − 3.000"
    );
    assert_eq!(
        list[1]["realized_savings"], 2_157_500,
        "20.000 + 2.000 artı − 425 harcanan (hedef düşülmez)"
    );
    assert_eq!(list[1]["to_savings"], Value::Null);

    // limit: en yeni N dönem
    let (_, b) = app.get("/stats/periods?limit=1", &s).await;
    let list = b["periods"].as_array().unwrap();
    assert_eq!(list.len(), 1);
    assert_eq!(list[0]["id"], dec.as_str());
    assert_eq!(
        b["total_saved"], 500_000,
        "toplam birikim limitten bağımsız"
    );

    // Başka hane: boş
    let other = app.register("Diger", None).await;
    let (_, b) = app.get("/stats/periods", &other).await;
    assert_eq!(b["total_saved"], 0);
    assert_eq!(b["periods"], json!([]));
    app.cleanup().await;
}