"""STRUCTURE lane — DB Browser for SQLite (Qt5).

Owns ONLY: the launch/surfaces GATE (app + frame + main containers exist) and
tree-SHAPE deltas (an interaction that adds/removes widgets, or a dialog that
adds a top-level window). No computed values, CHECKED flips, focus, or text
content live here — those belong to the behavioral lanes.
"""

import time
import pytest, pytest_check as check
import rb_atspi
from rb_atspi import rb_showing, rb_reach

DB = "/workspace/output/fixtures/sample.db"


@pytest.fixture(scope="module", autouse=True)
def _load_db(app):
    """Ensure the sample DB is open (cold baseline starts with no DB)."""
    rb_atspi.focus_app_window(app)
    frame = rb_atspi.get_main_frame(app)
    for _ in range(4):
        rb_atspi.press_escape(); time.sleep(0.15)
    title = (frame.get_name() or "")
    if "sample.db" not in title:
        fm = rb_atspi.find_first(frame, role="menu item", name="File")
        if fm: rb_atspi.click_node(fm); time.sleep(0.4)
        op = rb_atspi.find_first(frame, role="menu item", name="Open Database...")
        if op:
            rb_atspi.open_modal(op); time.sleep(1.2)
            rb_atspi.type_text(DB); time.sleep(0.4)
            rb_atspi.key("Return"); time.sleep(1.5)
    # settle on Database Structure tab
    st = rb_atspi.find_first(frame, role="page tab", name="Database Structure")
    if st:
        if not rb_atspi.do_action(st, "Press"):
            rb_atspi.click_node(st)
        time.sleep(0.5)
    yield


def _tab(frame, name):
    """Activate a main page tab by name via its Press action (reliable inline
    switch — an xdotool center-click misses when the window isn't WM-focused).
    Returns after settle."""
    t = rb_atspi.find_first(frame, role="page tab", name=name)
    if t:
        if not rb_atspi.do_action(t, "Press"):
            rb_atspi.click_node(t)
        time.sleep(0.7)
    return t


def _showing_count(frame, role):
    return sum(1 for n in rb_atspi.find_all(frame, role=role) if rb_atspi.is_showing(n))


def _win_count(app):
    n = 0
    for i in range(app.get_child_count()):
        c = app.get_child_at_index(i)
        if c is not None and (c.get_role_name() or "") in ("frame", "window", "dialog"):
            n += 1
    return n


# --------------------------------------------------------------------------- #
# GATE tests (jump_kind="none", depth 0) — the real top-level surfaces exist.
# --------------------------------------------------------------------------- #
@pytest.mark.rb(jump_kind="none", expect="4 main page tabs exist")
def test_gate_main_tabs_present(app, frame):
    for name in ("Database Structure", "Browse Data", "Edit Pragmas", "Execute SQL"):
        t = rb_atspi.find_first(frame, role="page tab", name=name)
        check.is_true(t is not None, f"page tab {name!r} missing")


@pytest.mark.rb(jump_kind="none", expect="File/Edit/View/Tools/Help menus exist")
def test_gate_menubar_present(app, frame):
    for name in ("File", "Edit", "View", "Tools", "Help"):
        m = rb_atspi.find_first(frame, role="menu item", name=name)
        check.is_true(m is not None, f"menu item {name!r} missing")


@pytest.mark.rb(jump_kind="none", expect="DB toolbar buttons exist")
def test_gate_db_toolbar_buttons(app, frame):
    for name in ("New Database", "Open Database", "Write Changes"):
        b = rb_atspi.find_first(frame, role="push button", name=name)
        check.is_true(b is not None, f"push button {name!r} missing")


# --------------------------------------------------------------------------- #
# SHAPE-DELTA tests — an interaction that changes the tree's shape.
# --------------------------------------------------------------------------- #
@pytest.mark.rb(
    jump_kind="transition",
    expect="Browse Data adds a Table dropdown (showing combo-box count 4 -> 5) vs the schema tree",
)
def test_tab_switch_changes_widget_shape(app, frame, rb, results_dir):
    _tab(frame, "Database Structure")
    struct_combos = _showing_count(frame, "combo box")

    rb.enter("browse")
    _tab(frame, "Browse Data")
    browse_combos = _showing_count(frame, "combo box")

    # The tree SHAPE must observably differ between the two tabs: Browse Data adds
    # its 'Table:' selector combo, absent from the Database Structure schema tree.
    # (widget_count/cell totals are NOT used — Qt retains hidden-tab widgets in the
    # tree once rendered, so only the per-tab showing combo count is a stable delta.)
    check.not_equal(struct_combos, browse_combos, "showing combo-box count did not change")
    check.greater(browse_combos, struct_combos, "Browse Data did not add a combo box")

    rb_atspi.screenshot_assert(
        "test_tab_switch_changes_widget_shape",
        "Browse Data tab active: a data grid of rows with a 'Table:' dropdown at "
        "top-left, replacing the Database Structure schema tree.",
        results_dir, window=frame,
    )


@pytest.mark.rb(
    jump_kind="reach",
    expect="Execute SQL toolbar (Execute SQL + New tab buttons) appears; not present on Structure",
)
def test_execute_tab_shows_sql_editor(app, frame, rb, results_dir):
    _tab(frame, "Database Structure")

    def _btn_showing(name):
        b = rb_atspi.find_first(frame, role="push button", name=name)
        return bool(b) and rb_atspi.is_showing(b)

    exec_before = _btn_showing("Execute SQL")
    newtab_before = _btn_showing("New tab")

    rb.enter("execute")
    _tab(frame, "Execute SQL")

    exec_after = _btn_showing("Execute SQL")
    newtab_after = _btn_showing("New tab")

    check.is_false(exec_before, "Execute SQL button was already showing on Structure tab")
    check.is_true(exec_after, "Execute SQL button not showing after switching to Execute SQL tab")
    check.is_false(newtab_before, "New tab button was already showing on Structure tab")
    check.is_true(newtab_after, "New tab button not showing after switching to Execute SQL tab")

    rb_atspi.screenshot_assert(
        "test_execute_tab_shows_sql_editor",
        "Execute SQL tab active: an SQL editor area with a toolbar containing "
        "'Execute SQL' and 'New tab' buttons, plus a results grid below.",
        results_dir, window=frame,
    )


@pytest.mark.rb(
    jump_kind="reach",
    expect="'About DB Browser for SQLite' dialog opens as a new top-level window",
)
def test_about_dialog_adds_window(app, frame, rb, results_dir):
    rb_atspi.focus_app_window(app); time.sleep(0.2)
    win_before = _win_count(app)
    before = rb_showing(app)

    hm = rb_atspi.find_first(frame, role="menu item", name="Help")
    assert hm is not None, "Help menu missing (precondition)"
    rb_atspi.click_node(hm); time.sleep(0.6)
    ab = rb_atspi.find_first(frame, role="menu item", name_sub="About")
    if ab is None:
        rb_atspi.press_escape()
        pytest.skip("About menu item not reachable")

    rb.enter("about")
    rb_atspi.open_modal(ab); time.sleep(1.2)
    after = rb_showing(app)
    win_after = _win_count(app)

    check.is_true(
        rb_reach(before, after, target="About DB Browser for SQLite"),
        "About dialog did not appear as a new showing surface",
    )
    check.greater(win_after, win_before, "top-level window count did not increase")

    rb_atspi.screenshot_assert(
        "test_about_dialog_adds_window",
        "The 'About DB Browser for SQLite' dialog is open on top of the main "
        "window, showing the program name and version text.",
        results_dir,
    )
    rb_atspi.press_escape(); time.sleep(0.3)
    rb_atspi.press_escape(); time.sleep(0.3)


@pytest.mark.rb(
    jump_kind="reach",
    expect="'Edit table definition' dialog opens as a new top-level window",
)
def test_create_table_dialog_adds_window(app, frame, rb, results_dir):
    rb_atspi.focus_app_window(app); time.sleep(0.2)
    win_before = _win_count(app)
    before = rb_showing(app)

    em = rb_atspi.find_first(frame, role="menu item", name="Edit")
    assert em is not None, "Edit menu missing (precondition)"
    rb_atspi.click_node(em); time.sleep(0.6)
    ct = rb_atspi.find_first(frame, role="menu item", name="Create Table...")
    if ct is None:
        rb_atspi.press_escape()
        pytest.skip("Create Table... menu item not reachable")

    rb.enter("create_table")
    rb_atspi.open_modal(ct); time.sleep(1.3)
    after = rb_showing(app)
    win_after = _win_count(app)

    check.is_true(
        rb_reach(before, after, target="Edit table definition"),
        "Create Table dialog did not appear as a new showing surface",
    )
    check.greater(win_after, win_before, "top-level window count did not increase")

    rb_atspi.screenshot_assert(
        "test_create_table_dialog_adds_window",
        "The 'Edit table definition' dialog is open on top of the main window, "
        "with a table-name field and an empty column-definition grid.",
        results_dir,
    )
    rb_atspi.press_escape(); time.sleep(0.3)
    rb_atspi.press_escape(); time.sleep(0.4)