#include "../tdkpin_runtime_ui.h"

#include <assert.h>
#include <limits.h>

uint16_t g_tpwincrt_columns;
uint16_t g_tpwincrt_rows;
uint16_t g_tpwincrt_ring_row_origin;
Win16FarPtr g_tpwincrt_screen_buffer;

static void test_signed_bounds(void)
{
    assert(tpwincrt_min_i16(-7, 3) == -7);
    assert(tpwincrt_min_i16(INT16_MAX, INT16_MIN) == INT16_MIN);
    assert(tpwincrt_max_i16(-7, 3) == 3);
    assert(tpwincrt_max_i16(INT16_MIN, INT16_MAX) == INT16_MAX);
}

static void test_scroll_commands(void)
{
    TpWinCrtScrollMessage message = {.thumb_position = 7};

    message.command = TPWINCRT_SB_LINEUP;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 9);
    message.command = TPWINCRT_SB_LINEDOWN;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 11);
    message.command = TPWINCRT_SB_PAGEUP;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 6);
    message.command = TPWINCRT_SB_PAGEDOWN;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 14);
    message.command = TPWINCRT_SB_THUMBPOSITION;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 7);
    message.command = TPWINCRT_SB_TOP;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 0);
    message.command = TPWINCRT_SB_BOTTOM;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 20);
    message.command = 5;
    assert(tpwincrt_apply_scroll_command(&message, 20, 4, 10) == 10);

    message.command = TPWINCRT_SB_LINEDOWN;
    assert(tpwincrt_apply_scroll_command(&message, 0, 0, INT16_MAX) == INT16_MIN);
}

static void test_circular_cell_pointer(void)
{
    g_tpwincrt_columns = 80;
    g_tpwincrt_rows = 25;
    g_tpwincrt_ring_row_origin = 24;
    g_tpwincrt_screen_buffer = win16_make_far_pointer(0x1234, 0xfff0);

    Win16FarPtr result = tpwincrt_cell_pointer(2, 5);
    assert(win16_far_selector(result) == 0x1234);
    assert(win16_far_offset(result) == 0x0045);
}

static void test_key_table_bytes(void)
{
    static const uint8_t expected[48] = {
        0x25, 0, 0, 0, 0x27, 0, 0, 1, 0x25, 1, 0, 2, 0x27, 1, 0, 3,
        0x24, 0, 0, 6, 0x23, 0, 0, 7, 0x26, 0, 1, 0, 0x28, 0, 1, 1,
        0x21, 0, 1, 2, 0x22, 0, 1, 3, 0x24, 1, 1, 6, 0x23, 1, 1, 7,
    };
    const uint8_t *actual = (const uint8_t *)g_tpwincrt_key_bindings;
    for (unsigned index = 0; index < sizeof(expected); index++) {
        assert(actual[index] == expected[index]);
    }
}

int main(void)
{
    test_signed_bounds();
    test_scroll_commands();
    test_circular_cell_pointer();
    test_key_table_bytes();
    return 0;
}