from datetime import datetime, timedelta


def test_create_text_default_public_and_24h(client):
    r = client.post("/api/items", json={"body": "hello **md**"})
    assert r.status_code == 200
    data = r.json()
    assert data["slug"]
    assert data["is_public"] is True
    assert data["expires_at"] is not None
    assert data["kind"] == "text"
    assert data["title"] == "hello **md**"
    assert data["body"] == "hello **md**"
    assert data["burn_after_read"] is False
    assert data["view_count"] == 0
    assert data["created_at"]


def test_link_only_not_on_wall(client):
    r = client.post("/api/items", json={"body": "secret", "is_public": False})
    slug = r.json()["slug"]
    wall = client.get("/api/items/wall").json()["items"]
    assert all(i["slug"] != slug for i in wall)
    assert client.get(f"/api/items/{slug}").status_code == 200


def test_ttl_options(client):
    never = client.post("/api/items", json={"body": "n", "ttl": "never"}).json()
    assert never["expires_at"] is None

    one_h = client.post("/api/items", json={"body": "h", "ttl": "1h"}).json()
    expires = datetime.fromisoformat(one_h["expires_at"])
    delta = expires - datetime.fromisoformat(one_h["created_at"])
    assert timedelta(minutes=50) < delta < timedelta(hours=2)

    week = client.post("/api/items", json={"body": "w", "ttl": "7d"}).json()
    expires_w = datetime.fromisoformat(week["expires_at"])
    delta_w = expires_w - datetime.fromisoformat(week["created_at"])
    assert timedelta(days=6) < delta_w < timedelta(days=8)


def test_wall_pagination_shape(client):
    for i in range(3):
        client.post("/api/items", json={"body": f"item {i}", "is_public": True})

    r = client.get("/api/items/wall", params={"page": 1, "page_size": 2})
    assert r.status_code == 200
    data = r.json()
    assert "items" in data
    assert data["page"] == 1
    assert data["page_size"] == 2
    assert data["total"] >= 3
    assert len(data["items"]) == 2
    # newest first
    titles = [i["title"] for i in data["items"]]
    assert titles[0] == "item 2"


def test_get_missing_404(client):
    assert client.get("/api/items/does-not-exist").status_code == 404


def test_title_from_first_line(client):
    r = client.post("/api/items", json={"body": "First line\nSecond line"})
    assert r.json()["title"] == "First line"


def test_explicit_title(client):
    r = client.post("/api/items", json={"body": "body text", "title": "Custom"})
    assert r.json()["title"] == "Custom"


def test_upload_small_file(client):
    files = {"file": ("hi.txt", b"abc", "text/plain")}
    data = {"is_public": "true", "ttl": "24h"}
    r = client.post("/api/items/upload", files=files, data=data)
    assert r.status_code == 200
    slug = r.json()["slug"]
    f = client.get(f"/api/items/{slug}/file")
    assert f.status_code == 200
    assert f.content == b"abc"


def test_reject_oversize(client, monkeypatch):
    import app.config as config_module

    monkeypatch.setattr(config_module.settings, "max_upload_mb", 1)
    big = b"x" * (1 * 1024 * 1024 + 1)
    files = {"file": ("big.txt", big, "text/plain")}
    r = client.post("/api/items/upload", files=files, data={"is_public": "true", "ttl": "24h"})
    assert r.status_code == 413


def test_reject_disallowed_extension(client):
    files = {"file": ("malware.exe", b"mz", "application/octet-stream")}
    r = client.post(
        "/api/items/upload",
        files=files,
        data={"is_public": "true", "ttl": "24h"},
    )
    assert r.status_code == 400


def test_file_burn_after_download_not_metadata(client):
    files = {"file": ("secret.txt", b"top-secret", "text/plain")}
    data = {"is_public": "true", "ttl": "24h", "burn_after_read": "true"}
    r = client.post("/api/items/upload", files=files, data=data)
    assert r.status_code == 200
    slug = r.json()["slug"]

    meta = client.get(f"/api/items/{slug}")
    assert meta.status_code == 200
    assert meta.json()["file_name"] == "secret.txt"
    assert meta.json()["burn_after_read"] is True

    first = client.get(f"/api/items/{slug}/file")
    assert first.status_code == 200
    assert first.content == b"top-secret"

    assert client.get(f"/api/items/{slug}/file").status_code == 404
    assert client.get(f"/api/items/{slug}").status_code == 404


def test_svg_forced_attachment_disposition(client):
    files = {"file": ("xss.svg", b"<svg xmlns='http://www.w3.org/2000/svg'></svg>", "image/svg+xml")}
    r = client.post(
        "/api/items/upload",
        files=files,
        data={"is_public": "true", "ttl": "24h"},
    )
    assert r.status_code == 200
    slug = r.json()["slug"]
    f = client.get(f"/api/items/{slug}/file")
    assert f.status_code == 200
    cd = f.headers.get("content-disposition", "")
    assert "attachment" in cd
    assert "inline" not in cd.split(";")[0]


def test_burn_claims_before_stream(client, monkeypatch):
    """burned=True is set before streaming, not only in the post-response BackgroundTask."""
    import app.db as db_module
    import app.api.public as public_api
    from app.models import Item
    from sqlalchemy import select

    # Background only deletes bytes; claiming is done in the request handler.
    monkeypatch.setattr(public_api, "_delete_file_path", lambda *_a, **_k: None)

    files = {"file": ("once.txt", b"payload", "text/plain")}
    r = client.post(
        "/api/items/upload",
        files=files,
        data={"is_public": "true", "ttl": "never", "burn_after_read": "true"},
    )
    assert r.status_code == 200
    slug = r.json()["slug"]

    first = client.get(f"/api/items/{slug}/file")
    assert first.status_code == 200
    assert first.content == b"payload"

    db = db_module.SessionLocal()
    try:
        item = db.scalar(select(Item).where(Item.slug == slug))
        assert item is not None
        assert item.burned is True
    finally:
        db.close()

    assert client.get(f"/api/items/{slug}/file").status_code == 404


def test_rate_limit_third_request_in_same_second(client, monkeypatch):
    import app.config as config_module
    from app.services import rate_limit as rate_limit_module

    monkeypatch.setattr(config_module.settings, "rate_limit_per_second", 2)
    rate_limit_module.reset()

    r1 = client.post("/api/items", json={"body": "one"})
    r2 = client.post("/api/items", json={"body": "two"})
    r3 = client.post("/api/items", json={"body": "three"})
    assert r1.status_code == 200
    assert r2.status_code == 200
    assert r3.status_code == 429


def test_banned_ip_cannot_create(client):
    import app.db as db_module
    from app.models import BannedIP

    db = db_module.SessionLocal()
    try:
        db.add(BannedIP(ip="testclient", reason="test"))
        db.commit()
    finally:
        db.close()

    r = client.post("/api/items", json={"body": "x"})
    assert r.status_code == 403