from datetime import datetime, timedelta, timezone


def ago(days):
    return (datetime.now(timezone.utc) - timedelta(days=days)).isoformat(timespec="milliseconds").replace("+00:00", "Z")


def board(client, project_id):
    return client.get(f"/api/kanban/projekte/{project_id}").json()


def make_board(client):
    return client.post("/api/kanban/projekte", json={"name": "Test"}).json()["id"]


def task(client, project_id, title, status="offen"):
    data = client.post(f"/api/kanban/projekte/{project_id}/aufgaben", json={"title": title, "status": status}).json()
    return next(t for t in data["tasks"] if t["title"] == title)


def test_erledigt_setzt_und_loescht_zeitpunkt(login):
    anna = login("anna")
    pid = make_board(anna)
    t = task(anna, pid, "A")
    assert t["doneAt"] is None
    data = anna.patch(f"/api/kanban/aufgaben/{t['id']}", json={"status": "erledigt"}).json()
    assert next(x for x in data["tasks"] if x["id"] == t["id"])["doneAt"]
    data = anna.patch(f"/api/kanban/aufgaben/{t['id']}", json={"status": "arbeit"}).json()
    assert next(x for x in data["tasks"] if x["id"] == t["id"])["doneAt"] is None
    assert task(anna, pid, "Gleich erledigt", status="erledigt")["doneAt"]


def test_archiv_nach_2_tagen_loeschen_nach_14(login, conn):
    anna = login("anna")
    pid = make_board(anna)
    for title in ("frisch", "alt", "uralt"):
        task(anna, pid, title, status="erledigt")
    with conn:
        conn.execute("UPDATE kanban_tasks SET done_at = ? WHERE title = 'alt'", (ago(3),))
        conn.execute("UPDATE kanban_tasks SET done_at = ? WHERE title = 'uralt'", (ago(15),))
    data = board(anna, pid)
    assert [t["title"] for t in data["tasks"]] == ["frisch"]
    assert [t["title"] for t in data["archived"]] == ["alt"]
    assert data["archived"][0]["deleteAt"] > ago(-10)
    assert conn.execute("SELECT COUNT(*) FROM kanban_tasks WHERE title = 'uralt'").fetchone()[0] == 0


def test_zurueckholen_startet_fristen_neu(login, conn):
    anna = login("anna")
    pid = make_board(anna)
    t = task(anna, pid, "alt", status="erledigt")
    with conn:
        conn.execute("UPDATE kanban_tasks SET done_at = ? WHERE id = ?", (ago(5), t["id"]))
    data = anna.post(f"/api/kanban/aufgaben/{t['id']}/zurueckholen").json()
    assert data["archived"] == []
    assert [x["title"] for x in data["tasks"]] == ["alt"]


def test_loeschen_nur_ersteller_oder_admin(login):
    anna, ben, chef = login("anna"), login("ben"), login("chef", admin=True)
    pid = make_board(anna)
    t1, t2 = task(anna, pid, "eins"), task(anna, pid, "zwei")
    assert ben.delete(f"/api/kanban/aufgaben/{t1['id']}").status_code == 403
    assert anna.delete(f"/api/kanban/aufgaben/{t1['id']}").status_code == 200
    assert chef.delete(f"/api/kanban/aufgaben/{t2['id']}").status_code == 200


# ---------- Checklisten und Abhängigkeiten ----------


def find(data, title):
    return next(t for t in data["tasks"] + data["archived"] if t["title"] == title)


def test_checkliste_speichern_und_abhaken(login):
    anna = login("anna")
    pid = make_board(anna)
    data = anna.post(f"/api/kanban/projekte/{pid}/aufgaben", json={
        "title": "Umzug", "checklist": [{"text": "Kartons"}, {"text": "Transporter", "done": True}],
    }).json()
    t = find(data, "Umzug")
    assert [(c["text"], c["done"]) for c in t["checklist"]] == [("Kartons", False), ("Transporter", True)]
    data = anna.patch(f"/api/kanban/aufgaben/{t['id']}", json={"checklist": [{"text": "Kartons", "done": True}]}).json()
    assert [(c["text"], c["done"]) for c in find(data, "Umzug")["checklist"]] == [("Kartons", True)]
    assert anna.patch(f"/api/kanban/aufgaben/{t['id']}", json={"checklist": [{"text": " "}]}).status_code == 400


def test_voraussetzung_sperrt_bis_erledigt(login):
    anna = login("anna")
    pid = make_board(anna)
    a = task(anna, pid, "Wand streichen")
    data = anna.post(f"/api/kanban/projekte/{pid}/aufgaben", json={"title": "Bilder aufhängen", "requires": [a["id"]]}).json()
    b = find(data, "Bilder aufhängen")
    assert b["blocked"] is True and b["requires"] == [a["id"]]
    res = anna.patch(f"/api/kanban/aufgaben/{b['id']}", json={"status": "arbeit"})
    assert res.status_code == 400 and "Wand streichen" in res.json()["error"]
    anna.patch(f"/api/kanban/aufgaben/{a['id']}", json={"status": "erledigt"})
    data = anna.patch(f"/api/kanban/aufgaben/{b['id']}", json={"status": "arbeit"}).json()
    assert find(data, "Bilder aufhängen")["blocked"] is False


def test_gesperrt_anlegen_nur_in_offen(login):
    anna = login("anna")
    pid = make_board(anna)
    a = task(anna, pid, "A")
    res = anna.post(f"/api/kanban/projekte/{pid}/aufgaben", json={"title": "B", "status": "arbeit", "requires": [a["id"]]})
    assert res.status_code == 400


def test_kein_kreis_und_nur_eigenes_projekt(login):
    anna = login("anna")
    pid, other = make_board(anna), make_board(anna)
    a, b = task(anna, pid, "A"), task(anna, pid, "B")
    fremd = task(anna, other, "Fremd")
    assert anna.patch(f"/api/kanban/aufgaben/{b['id']}", json={"requires": [a["id"]]}).status_code == 200
    assert anna.patch(f"/api/kanban/aufgaben/{a['id']}", json={"requires": [b["id"]]}).status_code == 400   # Kreis
    assert anna.patch(f"/api/kanban/aufgaben/{a['id']}", json={"requires": [a["id"]]}).status_code == 400   # selbst
    assert anna.patch(f"/api/kanban/aufgaben/{a['id']}", json={"requires": [fremd["id"]]}).status_code == 400


def test_geloeschte_voraussetzung_entsperrt(login):
    anna = login("anna")
    pid = make_board(anna)
    a = task(anna, pid, "A")
    data = anna.post(f"/api/kanban/projekte/{pid}/aufgaben", json={"title": "B", "requires": [a["id"]]}).json()
    anna.delete(f"/api/kanban/aufgaben/{a['id']}")
    assert find(board(anna, pid), "B")["blocked"] is False