"""
Unit tests for participants.py — pure/stdlib-only, no camera or webview
needed. Every test gets its own tmp_path as owner_dir.
"""

import os

import pytest

import participants


# --- create_participant -------------------------------------------------

def test_create_participant_rejects_empty_name(tmp_path):
    with pytest.raises(participants.ParticipantError):
        participants.create_participant(str(tmp_path), "   ")


def test_create_participant_returns_expected_fields(tmp_path):
    record = participants.create_participant(str(tmp_path), "Rahul", "left-handed")
    assert record["name"] == "Rahul"
    assert record["notes"] == "left-handed"
    assert record["session_count"] == 0
    assert record["last_session_at"] is None
    assert "id" in record and "created_at" in record


def test_create_participant_strips_whitespace(tmp_path):
    record = participants.create_participant(str(tmp_path), "  Rahul  ", "  notes  ")
    assert record["name"] == "Rahul"
    assert record["notes"] == "notes"


def test_create_participant_persists_to_disk(tmp_path):
    record = participants.create_participant(str(tmp_path), "Rahul")
    profile_path = os.path.join(str(tmp_path), "participants", record["id"], "profile.json")
    assert os.path.exists(profile_path)


# --- get_participant / list_participants ---------------------------------

def test_get_participant_returns_none_for_missing(tmp_path):
    assert participants.get_participant(str(tmp_path), "does-not-exist") is None


def test_get_participant_returns_none_for_falsy_id(tmp_path):
    assert participants.get_participant(str(tmp_path), "") is None
    assert participants.get_participant(str(tmp_path), None) is None


def test_get_participant_roundtrips(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul")
    fetched = participants.get_participant(str(tmp_path), created["id"])
    assert fetched == created


def test_list_participants_sorted_by_name(tmp_path):
    participants.create_participant(str(tmp_path), "Zara")
    participants.create_participant(str(tmp_path), "Aman")
    names = [p["name"] for p in participants.list_participants(str(tmp_path))]
    assert names == ["Aman", "Zara"]


def test_list_participants_empty_when_none_created(tmp_path):
    assert participants.list_participants(str(tmp_path)) == []


# --- update_participant ---------------------------------------------------

def test_update_participant_changes_name_and_notes(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul", "old notes")
    updated = participants.update_participant(str(tmp_path), created["id"], name="Rahul K", notes="new notes")
    assert updated["name"] == "Rahul K"
    assert updated["notes"] == "new notes"


def test_update_participant_leaves_untouched_field_when_none(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul", "keep me")
    updated = participants.update_participant(str(tmp_path), created["id"], name="Rahul K", notes=None)
    assert updated["name"] == "Rahul K"
    assert updated["notes"] == "keep me"


def test_update_participant_rejects_empty_name(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul")
    with pytest.raises(participants.ParticipantError):
        participants.update_participant(str(tmp_path), created["id"], name="   ")


def test_update_participant_rejects_missing_participant(tmp_path):
    with pytest.raises(participants.ParticipantError):
        participants.update_participant(str(tmp_path), "does-not-exist", name="X")


def test_update_participant_preserves_session_stats(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul")
    participants.touch_session_stats(str(tmp_path), created["id"])
    updated = participants.update_participant(str(tmp_path), created["id"], name="Rahul K")
    assert updated["session_count"] == 1


# --- delete_participant ---------------------------------------------------

def test_delete_participant_removes_folder(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul")
    pdir = participants.participant_dir(str(tmp_path), created["id"])
    assert os.path.isdir(pdir)
    participants.delete_participant(str(tmp_path), created["id"])
    assert not os.path.exists(pdir)
    assert participants.get_participant(str(tmp_path), created["id"]) is None


def test_delete_participant_rejects_missing_participant(tmp_path):
    with pytest.raises(participants.ParticipantError):
        participants.delete_participant(str(tmp_path), "does-not-exist")


def test_delete_participant_rejects_falsy_id(tmp_path):
    with pytest.raises(participants.ParticipantError):
        participants.delete_participant(str(tmp_path), "")


# --- touch_session_stats ---------------------------------------------------

def test_touch_session_stats_increments_count_and_sets_timestamp(tmp_path):
    created = participants.create_participant(str(tmp_path), "Rahul")
    assert created["session_count"] == 0
    participants.touch_session_stats(str(tmp_path), created["id"])
    updated = participants.get_participant(str(tmp_path), created["id"])
    assert updated["session_count"] == 1
    assert updated["last_session_at"] is not None


def test_touch_session_stats_noop_for_missing_participant(tmp_path):
    # Should not raise -- just silently does nothing, since the caller
    # (browser_session.py's _write_session_meta) has already committed to
    # the session by this point and shouldn't crash a session over it.
    participants.touch_session_stats(str(tmp_path), "does-not-exist")