#include <unity.h>
#include <cstdint>
#include <cctype>

// Include mocks first
#include "Arduino.h"
#include "WiFi.h"
#include "Preferences.h"
#include "config.h"

// Define all extern globals required by mock headers
uint32_t g_millis_value;
int      g_digital_read_value;
int      g_wifi_status;

// operation.h uses g_show_setup_qr_count under UNIT_TEST
int g_show_setup_qr_count;

// Include the functions under test
#include "../../src/operation.h"

void reset_state() {
    g_millis_value        = 0;
    g_digital_read_value  = HIGH;   // button not pressed
    g_wifi_status         = WL_CONNECTED;
    g_show_setup_qr_count = 0;
}

void setUp()    { reset_state(); }
void tearDown() {}

// ── FW-14: attempt_wifi returns true when WiFi connects immediately ───────────
void test_fw14_attempt_wifi_returns_true_on_connect() {
    g_wifi_status = WL_CONNECTED;
    bool result = attempt_wifi("myssid", "mypass");
    TEST_ASSERT_TRUE(result);
}

// ── FW-15: attempt_wifi returns false after timeout ───────────────────────────
// millis() auto-increments by 10 on each call; after enough iterations the
// elapsed time exceeds WIFI_TIMEOUT_MS (30000 ms).
void test_fw15_attempt_wifi_returns_false_on_timeout() {
    g_wifi_status  = 6;  // WL_DISCONNECTED — never connects, never terminal-fails
    g_millis_value = 0;
    bool result = attempt_wifi("myssid", "mypass");
    TEST_ASSERT_FALSE(result);
    // Sanity: we actually waited the full timeout, not bailed early
    TEST_ASSERT_GREATER_THAN(WIFI_TIMEOUT_MS, g_millis_value);
}

// ── FW-15a: attempt_wifi bails fast on WL_CONNECT_FAILED (bad PSK) ────────────
// Without fast-fail the user would wait the full 30 s before the red retry
// screen repaints; with it, failure surfaces in seconds.
void test_fw15a_attempt_wifi_returns_false_on_auth_fail() {
    g_wifi_status  = WL_CONNECT_FAILED;
    g_millis_value = 0;
    bool result = attempt_wifi("myssid", "wrongpass");
    TEST_ASSERT_FALSE(result);
    TEST_ASSERT_LESS_THAN(WIFI_TIMEOUT_MS, g_millis_value);
}

// ── FW-15b: attempt_wifi bails fast on WL_NO_SSID_AVAIL (network not visible) ─
void test_fw15b_attempt_wifi_returns_false_on_no_ssid() {
    g_wifi_status  = WL_NO_SSID_AVAIL;
    g_millis_value = 0;
    bool result = attempt_wifi("notthere", "anypass");
    TEST_ASSERT_FALSE(result);
    TEST_ASSERT_LESS_THAN(WIFI_TIMEOUT_MS, g_millis_value);
}

// ── FW-16: loop() state-machine (WiFi-credential submission path) ─────────────
// This test is deferred: loop() orchestrates DNS, WebServer, and WiFi
// together in a single function, making it impractical to unit-test without
// a larger integration harness.  The provisioning behavior is covered at the
// integration / hardware level.
// Placeholder: always passes as a reminder.
void test_fw16_loop_state_machine_deferred() {
    TEST_PASS_MESSAGE("FW-16 deferred: loop() state machine requires integration harness");
}

// ── FW-17: check_reset_button returns true when button held past threshold ────
// g_digital_read_value = LOW keeps the while-loop spinning; millis()
// auto-increments by 10 per call and will exceed RESET_HOLD_MS (5000 ms).
void test_fw17_reset_button_held_returns_true() {
    g_digital_read_value = LOW;
    g_millis_value       = 0;
    bool result = check_reset_button();
    TEST_ASSERT_TRUE(result);
}

// ── FW-18: check_reset_button returns false when button not pressed ───────────
void test_fw18_reset_button_not_pressed_returns_false() {
    g_digital_read_value = HIGH;  // button not pressed — loop exits immediately
    bool result = check_reset_button();
    TEST_ASSERT_FALSE(result);
}

int main(int argc, char** argv) {
    UNITY_BEGIN();
    RUN_TEST(test_fw14_attempt_wifi_returns_true_on_connect);
    RUN_TEST(test_fw15_attempt_wifi_returns_false_on_timeout);
    RUN_TEST(test_fw15a_attempt_wifi_returns_false_on_auth_fail);
    RUN_TEST(test_fw15b_attempt_wifi_returns_false_on_no_ssid);
    RUN_TEST(test_fw16_loop_state_machine_deferred);
    RUN_TEST(test_fw17_reset_button_held_returns_true);
    RUN_TEST(test_fw18_reset_button_not_pressed_returns_false);
    return UNITY_END();
}