-- lib-core.panel-test v0.2.0 — Panel test suite
-- Exercises: registry lifecycle, theme, errors, pause-gate, context-menu
-- dispatch, multi-active model, layout-slots, hit-test reverse-order.
-- Render paths are NOT tested here: engine.render.* is blocked in test-mode
-- (assert_in_render_phase guard in engine_lua_render.c). Input dispatch is
-- exercised via panel._dispatch_event_for_test(event).

local panel = require("lib-core.panel")
local T     = engine.test

local M = {}

-- -----------------------------------------------------------------------
-- Shared dummy widget factories
-- -----------------------------------------------------------------------

local function make_widget(overrides)
    local w = {
        title        = "Test Widget",
        render       = function(_ctx) end,
        handle_input = function(_ctx, _event) end,
    }
    if overrides then
        for k, v in pairs(overrides) do w[k] = v end
    end
    return w
end

-- -----------------------------------------------------------------------
-- Test suite
-- -----------------------------------------------------------------------

function M.run_tests(_ctx)

    -- ==================================================================
    -- v0.1.1 baseline tests (bw-compat verification)
    -- ==================================================================

    -- ------------------------------------------------------------------
    -- 1. register + open / close round-trip
    -- ------------------------------------------------------------------
    panel._test_reset_all()
    panel.register("w1", make_widget())
    panel.open("w1")
    T.assert(panel.is_open(), "register + open makes is_open() true")

    -- ------------------------------------------------------------------
    -- 2. close after open works
    -- ------------------------------------------------------------------
    panel.close()
    T.assert(not panel.is_open(), "close() after open makes is_open() false")

    -- ------------------------------------------------------------------
    -- 3. toggle twice → opens then closes
    -- ------------------------------------------------------------------
    panel.toggle("w1")
    T.assert(panel.is_open(), "toggle (first) opens panel")
    panel.toggle("w1")
    T.assert(not panel.is_open(), "toggle (second) closes panel")

    -- ------------------------------------------------------------------
    -- 4. open("unknown_id") → loud-error
    -- ------------------------------------------------------------------
    local ok_unknown = pcall(panel.open, "does_not_exist")
    T.assert(not ok_unknown,
        "panel.open with unknown widget_id raises an error")

    -- ------------------------------------------------------------------
    -- 5. set_theme with valid override + get_theme reads merged
    -- ------------------------------------------------------------------
    panel.set_theme({ padding = 16 })
    local t = panel.get_theme()
    T.equals(t.padding, 16, "set_theme override is visible via get_theme")

    -- Restore for subsequent tests
    panel.set_theme({ padding = 8 })

    -- ------------------------------------------------------------------
    -- 6. set_theme with unknown key → loud-error
    -- ------------------------------------------------------------------
    local ok_bad_key = pcall(panel.set_theme, { nonexistent_key = 99 })
    T.assert(not ok_bad_key,
        "set_theme with unknown key raises an error")

    -- ------------------------------------------------------------------
    -- 7. register without render function → loud-error
    -- ------------------------------------------------------------------
    local ok_no_render = pcall(panel.register, "w_bad", {
        title        = "Bad",
        handle_input = function() end,
        -- render intentionally missing
    })
    T.assert(not ok_no_render,
        "panel.register without render function raises an error")

    -- ------------------------------------------------------------------
    -- 8. pause_on_open=true widget makes is_pausing()=true; close → false
    -- ------------------------------------------------------------------
    panel.register("w_pause", make_widget({ pause_on_open = true }))
    panel.open("w_pause")
    T.assert(panel.is_pausing(),
        "is_pausing() is true when active widget has pause_on_open=true")
    panel.close()
    T.assert(not panel.is_pausing(),
        "is_pausing() is false after close()")

    -- ------------------------------------------------------------------
    -- 9. show_context_menu + simulated click on action row → callback invoked
    -- ------------------------------------------------------------------

    -- Need an active widget for context-menu dispatch path
    panel.open("w1")

    local callback_fired = false

    -- The context-menu renders at a known position; compute the click coords:
    -- show_context_menu is called at (100, 100). With padding=8, row_height=24:
    -- row 1 spans y=100..(100+24). Use x=120, y=110 (inside row 1).
    panel.show_context_menu(100, 100, {
        {
            label    = "Do Thing",
            callback = function(_info)
                callback_fired = true
            end,
        },
    })

    -- Simulate a left-click inside the first action row
    panel._dispatch_event_for_test({
        kind   = "click",
        x      = 120,
        y      = 110,
        button = "left",
    })

    T.assert(callback_fired,
        "context-menu action callback is invoked on click inside its row")

    -- ------------------------------------------------------------------
    -- 10. non-pause widget: is_pausing() = false
    -- ------------------------------------------------------------------
    panel.close()    -- close w1 from test 9
    panel.open("w1") -- w1 has no pause_on_open
    T.assert(not panel.is_pausing(),
        "is_pausing() is false for widget without pause_on_open")

    -- Cleanup
    panel.close()
    panel.unregister("w1")
    panel.unregister("w_pause")

    -- ==================================================================
    -- v0.2.0 — Multi-Active + Layout-Slots + Bw-Compat-Shim
    -- ==================================================================

    -- ------------------------------------------------------------------
    -- W.0 #1: bw-compat register(id, widget) without opts uses center default
    -- ------------------------------------------------------------------
    panel._test_reset_all()
    panel.register("w_bc1", make_widget({ title = "BC" }))
    panel.open("w_bc1")
    T.assert(panel.is_open(), "is_open() any-open bw-compat")
    T.assert(panel.is_open("w_bc1"), "is_open(id) per-id")
    local bounds_bc = panel._test_get_window_bounds("w_bc1")
    T.assert(bounds_bc ~= nil, "bounds resolved for open window")
    -- center slot: x = sw*0.25, w = sw*0.50, h = sh*0.60
    T.assert(bounds_bc.x > 0, "default center slot x > 0")
    T.assert(bounds_bc.w > 0, "default center slot w > 0")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #2: multi-active open(A) + open(B) both stay open
    -- ------------------------------------------------------------------
    panel.register("w_mA", make_widget({ title = "A" }))
    panel.register("w_mB", make_widget({ title = "B" }))
    panel.open("w_mA")
    panel.open("w_mB")
    T.assert(panel.is_open("w_mA"), "A still open after opening B")
    T.assert(panel.is_open("w_mB"), "B is open")
    local open_ids = panel._test_get_open_ids()
    T.equals(#open_ids, 2, "two windows open")
    T.equals(open_ids[1], "w_mA", "A first in open_order")
    T.equals(open_ids[2], "w_mB", "B second in open_order")
    T.equals(panel._test_get_focused_id(), "w_mB",
        "B (last-opened) is focused")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #3: close(id) per-id closes only that one
    -- ------------------------------------------------------------------
    panel.register("w_cA", make_widget({ title = "A" }))
    panel.register("w_cB", make_widget({ title = "B" }))
    panel.open("w_cA")
    panel.open("w_cB")
    panel.close("w_cA")
    T.assert(not panel.is_open("w_cA"), "A closed by per-id close")
    T.assert(panel.is_open("w_cB"), "B still open after per-id close(A)")
    T.equals(panel._test_get_focused_id(), "w_cB",
        "B is focused after A closed")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #4: close() bw-compat closes the focused (last-opened)
    -- ------------------------------------------------------------------
    panel.register("w_fA", make_widget({ title = "A" }))
    panel.register("w_fB", make_widget({ title = "B" }))
    panel.open("w_fA")
    panel.open("w_fB")
    panel.close()  -- no arg
    T.assert(not panel.is_open("w_fB"), "B (focused) closed by close()")
    T.assert(panel.is_open("w_fA"), "A still open after close() (bw-compat)")
    T.equals(panel._test_get_focused_id(), "w_fA",
        "A is now focused after focused-close")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #5: is_open() bw-compat = any-open
    -- ------------------------------------------------------------------
    panel.register("w_io", make_widget({ title = "X" }))
    T.assert(not panel.is_open(), "is_open() false when nothing open")
    panel.open("w_io")
    T.assert(panel.is_open(), "is_open() true after open (bw-compat any)")
    panel.close()
    T.assert(not panel.is_open(), "is_open() false after close")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #6: layout left-half resolves correctly
    -- ------------------------------------------------------------------
    panel.register("w_lh", make_widget({ title = "L" }), { layout = "left-half" })
    panel.open("w_lh")
    local b_lh = panel._test_get_window_bounds("w_lh")
    local sw_lh, sh_lh = panel._test_get_screen_size()
    T.assert(b_lh.x == 0, "left-half x = 0")
    T.assert(math.abs(b_lh.w - sw_lh * 0.5) < 0.01, "left-half w = sw/2")
    T.assert(math.abs(b_lh.h - sh_lh) < 0.01, "left-half h = sh")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #7: layout right-half resolves correctly
    -- ------------------------------------------------------------------
    panel.register("w_rh", make_widget({ title = "R" }), { layout = "right-half" })
    panel.open("w_rh")
    local b_rh = panel._test_get_window_bounds("w_rh")
    local sw_rh = panel._test_get_screen_size()
    T.assert(math.abs(b_rh.x - sw_rh * 0.5) < 0.01, "right-half x = sw/2")
    T.assert(math.abs(b_rh.w - sw_rh * 0.5) < 0.01, "right-half w = sw/2")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #8: layout center default
    -- ------------------------------------------------------------------
    panel.register("w_c", make_widget({ title = "C" }))  -- no opts = center
    panel.open("w_c")
    local b_c = panel._test_get_window_bounds("w_c")
    local sw_c, sh_c = panel._test_get_screen_size()
    T.assert(math.abs(b_c.x - sw_c * 0.25) < 0.01, "center x = sw*0.25")
    T.assert(math.abs(b_c.y - sh_c * 0.20) < 0.01, "center y = sh*0.20")
    T.assert(math.abs(b_c.w - sw_c * 0.50) < 0.01, "center w = sw*0.50")
    T.assert(math.abs(b_c.h - sh_c * 0.60) < 0.01, "center h = sh*0.60")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #9: layout custom function
    -- ------------------------------------------------------------------
    panel.register("w_cu", make_widget({ title = "Cu" }), {
        layout = function(_sw, _sh)
            return { x = 10, y = 20, w = 100, h = 50 }
        end,
    })
    panel.open("w_cu")
    local b_cu = panel._test_get_window_bounds("w_cu")
    T.equals(b_cu.x, 10, "custom layout x = 10")
    T.equals(b_cu.y, 20, "custom layout y = 20")
    T.equals(b_cu.w, 100, "custom layout w = 100")
    T.equals(b_cu.h, 50, "custom layout h = 50")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #10: Loud-Error on unknown layout-slot
    -- ------------------------------------------------------------------
    local ok_bog, err_bog = pcall(panel.register, "w_bog",
        make_widget({ title = "X" }), { layout = "bogus" })
    T.assert(not ok_bog, "register with unknown layout slot errors")
    T.assert(err_bog ~= nil and string.find(err_bog, "panel%.register") ~= nil,
        "error message mentions panel.register")
    T.assert(err_bog ~= nil and string.find(err_bog, "bogus") ~= nil,
        "error message mentions the bad slot name")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #11: hit-test reverse-open-order
    -- ------------------------------------------------------------------
    local captured_a, captured_b = nil, nil
    local w_hA = make_widget({
        title        = "A",
        handle_input = function(_ctx, event) captured_a = event end,
    })
    local w_hB = make_widget({
        title        = "B",
        handle_input = function(_ctx, event) captured_b = event end,
    })
    panel.register("w_hA", w_hA, { layout = "left-half" })
    panel.register("w_hB", w_hB, { layout = "right-half" })
    panel.open("w_hA")
    panel.open("w_hB")
    local sw_h, sh_h = panel._test_get_screen_size()
    -- Click in left half: hits A only (B's bounds are right-half so click misses)
    panel._dispatch_event_for_test({
        kind = "click", button = "left",
        x = sw_h * 0.25, y = sh_h * 0.5,
    })
    T.assert(captured_a ~= nil, "A captured click in its left-half bounds")
    T.assert(captured_b == nil, "B did not capture click outside its bounds")
    -- Reset captures, click in right half
    captured_a, captured_b = nil, nil
    panel._dispatch_event_for_test({
        kind = "click", button = "left",
        x = sw_h * 0.75, y = sh_h * 0.5,
    })
    T.assert(captured_b ~= nil, "B captured click in its right-half bounds")
    T.assert(captured_a == nil, "A did not capture click outside its bounds")
    panel._test_reset_all()

    -- ------------------------------------------------------------------
    -- W.0 #12: is_pausing() checks ALL open windows, not just focused
    -- ------------------------------------------------------------------
    panel.register("w_np", make_widget({ title = "NP" }))  -- non-pausing
    panel.register("w_p", make_widget({ title = "P", pause_on_open = true }))
    panel.open("w_p")
    panel.open("w_np")  -- focused = non-pausing
    T.assert(panel.is_pausing(),
        "is_pausing() true when a non-focused open window has pause_on_open")
    panel.close("w_p")
    T.assert(not panel.is_pausing(),
        "is_pausing() false after closing the pausing window (np still open)")
    panel._test_reset_all()
end

return M