"""Tests for screenshot.py — the pure helpers behind Wayland screenshot capture.

The script is mostly thin wrappers around grim/hyprctl (I/O boundaries, verified
functionally). The logic worth testing is pure: size parsing, grim geometry
strings, window matching, the Hyprland exec-rule body, and floating-window
centering. Those are imported and exercised directly here; the subprocess
wrappers and the capture orchestration are not unit-tested.
"""

import sys
from pathlib import Path

import pytest

sys.path.insert(0, str(Path(__file__).parent.parent))
import screenshot  # noqa: E402


# ------------------------------- parse_size ----------------------------------

def test_parse_size_normal():
    assert screenshot.parse_size("1600x1000") == (1600, 1000)

def test_parse_size_boundary_zero_and_one():
    assert screenshot.parse_size("0x0") == (0, 0)
    assert screenshot.parse_size("1x1") == (1, 1)

@pytest.mark.parametrize("bad", ["", "bad", "100", "100x", "x100", "100X100", " 1x1"])
def test_parse_size_error_malformed_dies(bad):
    with pytest.raises(SystemExit):
        screenshot.parse_size(bad)


# ------------------------------ geometry_str ---------------------------------

def test_geometry_str_normal():
    assert screenshot.geometry_str({"at": [10, 20], "size": [800, 600]}) == "10,20 800x600"

def test_geometry_str_boundary_origin_and_unit():
    assert screenshot.geometry_str({"at": [0, 0], "size": [1, 1]}) == "0,0 1x1"


# ------------------------------ match_windows --------------------------------

CLIENTS = [
    {"class": "Emacs", "title": "Emacs 30.2 : agent [.emacs.d]"},
    {"class": "firefox", "title": "TrueNAS — Mozilla Firefox"},
    {"class": "foot", "title": "foot"},
]

def test_match_windows_normal_by_class():
    assert screenshot.match_windows(CLIENTS, "firefox") == [CLIENTS[1]]

def test_match_windows_normal_by_title():
    assert screenshot.match_windows(CLIENTS, "TrueNAS") == [CLIENTS[1]]

def test_match_windows_case_insensitive():
    assert screenshot.match_windows(CLIENTS, "EMACS") == [CLIENTS[0]]

def test_match_windows_multiple():
    # "o" appears in firefox and foot classes
    assert len(screenshot.match_windows(CLIENTS, "foo")) == 1
    assert len(screenshot.match_windows(CLIENTS, "e")) >= 2  # Emacs + firefox (title/class)

def test_match_windows_boundary_empty_clients():
    assert screenshot.match_windows([], "anything") == []

def test_match_windows_boundary_missing_fields():
    # client with no class/title keys must not raise
    assert screenshot.match_windows([{"class": None, "title": None}], "x") == []

def test_match_windows_error_no_match():
    assert screenshot.match_windows(CLIENTS, "nonexistent-zzz") == []


# ------------------------------- launch_rule ---------------------------------

def test_launch_rule_tiled_default():
    assert screenshot.launch_rule(2, "tiled") == "workspace 2 silent"

def test_launch_rule_monocle_adds_fullscreen():
    assert screenshot.launch_rule(2, "monocle") == "workspace 2 silent;fullscreen 1"

def test_launch_rule_floating_adds_float():
    assert screenshot.launch_rule(7, "floating") == "workspace 7 silent;float"


# ------------------------------ center_offset --------------------------------

def test_center_offset_normal():
    assert screenshot.center_offset(1920, 1080, 800, 600) == (560, 240)

def test_center_offset_boundary_exact_fit():
    assert screenshot.center_offset(1920, 1080, 1920, 1080) == (0, 0)

def test_center_offset_error_window_larger_than_output_clamps():
    assert screenshot.center_offset(800, 600, 1000, 700) == (0, 0)