import os
from pathlib import Path
from datetime import date
from openvpncertupdate import build_ovpn

def setup_pki(tmp_path, cn, inline_content="<ca>X</ca>"):
    pki = tmp_path / "pki"
    private_dir = pki / "inline" / "private"
    private_dir.mkdir(parents=True)
    (private_dir / f"{cn}.inline").write_text(inline_content)
    return str(pki)

def test_creates_file_with_combined_content(tmp_path):
    pki = setup_pki(tmp_path, "alice", "<ca>CERT</ca>")
    tmpl = tmp_path / "t.ovpn"
    tmpl.write_text("client\ndev tun\n")
    result = build_ovpn("alice", pki, str(tmpl), str(tmp_path / "out"), "vpn.ovpn")
    content = Path(result).read_text()
    assert "client" in content
    assert "CERT" in content

def test_output_path_has_cn_and_date(tmp_path):
    pki = setup_pki(tmp_path, "bob")
    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
    today = date.today().strftime("%Y-%m-%d")
    result = build_ovpn("bob", pki, str(tmpl), str(tmp_path / "out"), "vpn.ovpn")
    assert f"bob_{today}" in result
    assert result.endswith("vpn.ovpn")


def test_first_issuance_uses_counter_00(tmp_path):
    pki = setup_pki(tmp_path, "carol")
    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
    today = date.today().strftime("%Y-%m-%d")
    result = build_ovpn("carol", pki, str(tmpl), str(tmp_path / "out"), "vpn.ovpn")
    assert f"carol_{today}_00" in result


def test_second_issuance_same_day_uses_counter_01(tmp_path):
    pki = setup_pki(tmp_path, "dave")
    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
    today = date.today().strftime("%Y-%m-%d")
    out = str(tmp_path / "out")
    build_ovpn("dave", pki, str(tmpl), out, "vpn.ovpn")
    result2 = build_ovpn("dave", pki, str(tmpl), out, "vpn.ovpn")
    assert f"dave_{today}_01" in result2


def test_counter_skips_to_max_plus_one(tmp_path):
    """If _00 and _02 already exist (gap), next counter is 03, not 01."""
    pki = setup_pki(tmp_path, "eve")
    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
    today = date.today().strftime("%Y-%m-%d")
    out = tmp_path / "out"
    (out / f"eve_{today}_00").mkdir(parents=True)
    (out / f"eve_{today}_02").mkdir(parents=True)
    result = build_ovpn("eve", pki, str(tmpl), str(out), "vpn.ovpn")
    assert f"eve_{today}_03" in result


def test_different_cn_same_day_does_not_affect_counter(tmp_path):
    pki_a = setup_pki(tmp_path / "a", "alice")
    pki_b = setup_pki(tmp_path / "b", "bob")
    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
    today = date.today().strftime("%Y-%m-%d")
    out = str(tmp_path / "out")
    build_ovpn("alice", str(tmp_path / "a" / "pki"), str(tmpl), out, "vpn.ovpn")
    result = build_ovpn("bob", str(tmp_path / "b" / "pki"), str(tmpl), out, "vpn.ovpn")
    assert f"bob_{today}_00" in result


def test_next_day_counter_resets_to_00(tmp_path):
    """Directories from a different date don't affect today's counter."""
    pki = setup_pki(tmp_path, "frank")
    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
    today = date.today().strftime("%Y-%m-%d")
    out = tmp_path / "out"
    # Simulate yesterday's directories already present
    (out / "frank_2000-01-01_00").mkdir(parents=True)
    (out / "frank_2000-01-01_05").mkdir(parents=True)
    result = build_ovpn("frank", pki, str(tmpl), str(out), "vpn.ovpn")
    assert f"frank_{today}_00" in result