/**
 * @file test_switch_debouncer.c
 * @brief Unit-Tests fuer den Switch-Debouncer.
 *
 * @reqs SWE-025
 * @arch SWA-006
 */
#include "../unit_test_framework.h"
#include "../../src/switch_debouncer.h"

TestStats g_test_stats = {0, 0};

static SwitchRaw mk(bool apply, bool release)
{
    SwitchRaw r = {0};
    r.apply_raw   = apply   ? 1U : 0U;
    r.release_raw = release ? 1U : 0U;
    return r;
}

static void test_init_state_is_neutral(void)
{
    TEST_BEGIN("init -> neutral");
    (void)switch_init();
    ASSERT_EQ(switch_get_state(), SWITCH_NEUTRAL);
    TEST_END();
}

static void test_debounce_apply_takes_5_samples(void)
{
    TEST_BEGIN("apply needs 5 stable samples (50 ms)");
    (void)switch_init();
    for (int i = 0; i < 4; ++i) {
        switch_step_10ms(mk(true, false));
        ASSERT_EQ(switch_get_state(), SWITCH_NEUTRAL);
    }
    switch_step_10ms(mk(true, false));
    ASSERT_EQ(switch_get_state(), SWITCH_APPLY);
    TEST_END();
}

static void test_debounce_release_takes_5_samples(void)
{
    TEST_BEGIN("release needs 5 stable samples (50 ms)");
    (void)switch_init();
    for (int i = 0; i < 5; ++i) {
        switch_step_10ms(mk(false, true));
    }
    ASSERT_EQ(switch_get_state(), SWITCH_RELEASE);
    TEST_END();
}

static void test_bounce_does_not_change_state(void)
{
    TEST_BEGIN("bouncing input keeps current state");
    (void)switch_init();
    for (int i = 0; i < 5; ++i) {
        switch_step_10ms(mk(true, false));
    }
    ASSERT_EQ(switch_get_state(), SWITCH_APPLY);
    /* Bounce: 1 sample apply, 1 sample neutral, 1 sample release ... */
    switch_step_10ms(mk(true, false));
    switch_step_10ms(mk(false, false));
    switch_step_10ms(mk(false, true));
    switch_step_10ms(mk(true, false));
    switch_step_10ms(mk(false, false));
    ASSERT_EQ(switch_get_state(), SWITCH_APPLY);
    TEST_END();
}

static void test_both_pressed_is_neutral(void)
{
    TEST_BEGIN("both apply+release pressed -> neutral");
    (void)switch_init();
    for (int i = 0; i < 5; ++i) {
        switch_step_10ms(mk(true, true));
    }
    ASSERT_EQ(switch_get_state(), SWITCH_NEUTRAL);
    TEST_END();
}

int main(void)
{
    printf("== test_switch_debouncer ==\n");
    test_init_state_is_neutral();
    test_debounce_apply_takes_5_samples();
    test_debounce_release_takes_5_samples();
    test_bounce_does_not_change_state();
    test_both_pressed_is_neutral();
    TEST_SUMMARY();
}