/*
 * test_weather.cpp -- Weather station example tests.
 *
 * THIS FILE IS MANAGED BY ANVIL and will be updated by `anvil refresh`.
 * Do not edit -- put your own tests in test_unit.cpp and test_system.cpp.
 */

#include <gtest/gtest.h>
#include <gmock/gmock.h>

#include "mock_arduino.h"
#include "hal.h"
#include "mock_hal.h"
#include "sim_hal.h"
#include "tmp36_mock.h"
#include "tmp36_sim.h"
#include "{{PROJECT_NAME}}_app.h"

using ::testing::_;
using ::testing::AnyNumber;
using ::testing::Return;
using ::testing::HasSubstr;

// ============================================================================
// Unit Tests -- verify WeatherApp behavior with mock sensor
// ============================================================================

class WeatherUnitTest : public ::testing::Test {
protected:
    void SetUp() override {
        ON_CALL(mock_, millis()).WillByDefault(Return(0));
        EXPECT_CALL(mock_, serialBegin(_)).Times(AnyNumber());
        EXPECT_CALL(mock_, serialPrint(_)).Times(AnyNumber());
        EXPECT_CALL(mock_, serialPrintln(_)).Times(AnyNumber());
        EXPECT_CALL(mock_, millis()).Times(AnyNumber());
    }

    ::testing::NiceMock<MockHal> mock_;
    Tmp36Mock sensor_;
};

TEST_F(WeatherUnitTest, BeginPrintsStartupMessage) {
    WeatherApp app(&mock_, &sensor_);

    EXPECT_CALL(mock_, serialBegin(115200)).Times(1);
    EXPECT_CALL(mock_, serialPrintln(HasSubstr("WeatherApp started"))).Times(1);

    app.begin();
}

TEST_F(WeatherUnitTest, BeginTakesInitialReading) {
    sensor_.setTemperature(25.0f);
    WeatherApp app(&mock_, &sensor_);
    app.begin();

    EXPECT_EQ(app.readCount(), 1);
    EXPECT_NEAR(app.lastCelsius(), 25.0f, 0.1f);
}

TEST_F(WeatherUnitTest, ReadsAfterInterval) {
    sensor_.setTemperature(20.0f);
    WeatherApp app(&mock_, &sensor_);

    ON_CALL(mock_, millis()).WillByDefault(Return(0));
    app.begin();
    EXPECT_EQ(app.readCount(), 1);

    // Not enough time yet
    ON_CALL(mock_, millis()).WillByDefault(Return(1999));
    app.update();
    EXPECT_EQ(app.readCount(), 1);

    // Now 2 seconds have passed
    ON_CALL(mock_, millis()).WillByDefault(Return(2000));
    app.update();
    EXPECT_EQ(app.readCount(), 2);
}

TEST_F(WeatherUnitTest, DoesNotReadTooEarly) {
    sensor_.setTemperature(22.0f);
    WeatherApp app(&mock_, &sensor_);

    ON_CALL(mock_, millis()).WillByDefault(Return(0));
    app.begin();

    ON_CALL(mock_, millis()).WillByDefault(Return(1500));
    app.update();

    EXPECT_EQ(app.readCount(), 1);
}

TEST_F(WeatherUnitTest, CelsiusToFahrenheitConversion) {
    sensor_.setTemperature(0.0f);
    WeatherApp app(&mock_, &sensor_);
    app.begin();

    EXPECT_NEAR(app.lastCelsius(), 0.0f, 0.1f);
    EXPECT_NEAR(app.lastFahrenheit(), 32.0f, 0.1f);
}

TEST_F(WeatherUnitTest, BoilingPoint) {
    sensor_.setTemperature(100.0f);
    WeatherApp app(&mock_, &sensor_);
    app.begin();

    EXPECT_NEAR(app.lastCelsius(), 100.0f, 0.1f);
    EXPECT_NEAR(app.lastFahrenheit(), 212.0f, 0.1f);
}

TEST_F(WeatherUnitTest, NegativeTemperature) {
    sensor_.setTemperature(-10.0f);
    WeatherApp app(&mock_, &sensor_);
    app.begin();

    EXPECT_NEAR(app.lastCelsius(), -10.0f, 0.1f);
    EXPECT_NEAR(app.lastFahrenheit(), 14.0f, 0.1f);
}

TEST_F(WeatherUnitTest, PrintsTemperatureOnRead) {
    sensor_.setTemperature(25.0f);
    WeatherApp app(&mock_, &sensor_);

    EXPECT_CALL(mock_, serialPrint(HasSubstr("Temperature: "))).Times(1);
    EXPECT_CALL(mock_, serialPrintln(HasSubstr(" F)"))).Times(1);

    app.begin();
}

TEST_F(WeatherUnitTest, MultipleReadingsTrackNewTemperature) {
    WeatherApp app(&mock_, &sensor_);

    sensor_.setTemperature(20.0f);
    ON_CALL(mock_, millis()).WillByDefault(Return(0));
    app.begin();
    EXPECT_NEAR(app.lastCelsius(), 20.0f, 0.1f);

    sensor_.setTemperature(30.0f);
    ON_CALL(mock_, millis()).WillByDefault(Return(2000));
    app.update();
    EXPECT_NEAR(app.lastCelsius(), 30.0f, 0.1f);
    EXPECT_EQ(app.readCount(), 2);
}

// ============================================================================
// System Tests -- exercise WeatherApp with simulated sensor and hardware
// ============================================================================

class WeatherSystemTest : public ::testing::Test {
protected:
    void SetUp() override {
        mock_arduino_reset();
        sim_.setMillis(0);
    }

    SimHal sim_;
    Tmp36Sim sensor_{25.0f};  // 25 C base temperature
};

TEST_F(WeatherSystemTest, StartsAndPrintsToSerial) {
    WeatherApp app(&sim_, &sensor_);
    app.begin();

    std::string output = sim_.serialOutput();
    EXPECT_NE(output.find("WeatherApp started"), std::string::npos);
    EXPECT_NE(output.find("Temperature:"), std::string::npos);
}

TEST_F(WeatherSystemTest, InitialReadingIsReasonable) {
    Tmp36Sim exact_sensor(25.0f, 0.0f);  // zero noise
    WeatherApp app(&sim_, &exact_sensor);
    app.begin();

    EXPECT_NEAR(app.lastCelsius(), 25.0f, 1.0f);
    EXPECT_EQ(app.readCount(), 1);
}

TEST_F(WeatherSystemTest, ReadsAtTwoSecondIntervals) {
    WeatherApp app(&sim_, &sensor_);
    app.begin();
    EXPECT_EQ(app.readCount(), 1);

    // 1 second -- no new reading
    sim_.advanceMillis(1000);
    app.update();
    EXPECT_EQ(app.readCount(), 1);

    // 2 seconds -- new reading
    sim_.advanceMillis(1000);
    app.update();
    EXPECT_EQ(app.readCount(), 2);

    // 4 seconds -- another reading
    sim_.advanceMillis(2000);
    app.update();
    EXPECT_EQ(app.readCount(), 3);
}

TEST_F(WeatherSystemTest, FiveMinuteRun) {
    WeatherApp app(&sim_, &sensor_);
    app.begin();

    // Run 5 minutes at 100ms resolution
    for (int i = 0; i < 3000; ++i) {
        sim_.advanceMillis(100);
        app.update();
    }

    // 5 minutes = 300 seconds / 2 second interval = 150 readings + 1 initial
    EXPECT_EQ(app.readCount(), 151);
}

TEST_F(WeatherSystemTest, TemperatureChangeMidRun) {
    Tmp36Sim sensor(20.0f, 0.0f);  // start at 20 C, no noise
    WeatherApp app(&sim_, &sensor);
    app.begin();

    EXPECT_NEAR(app.lastCelsius(), 20.0f, 1.0f);

    // Change temperature and wait for next reading
    sensor.setBaseTemperature(35.0f);
    sim_.advanceMillis(2000);
    app.update();

    EXPECT_NEAR(app.lastCelsius(), 35.0f, 1.0f);
}

TEST_F(WeatherSystemTest, SerialOutputContainsFahrenheit) {
    Tmp36Sim exact_sensor(0.0f, 0.0f);  // 0 C = 32 F
    WeatherApp app(&sim_, &exact_sensor);
    app.begin();

    std::string output = sim_.serialOutput();
    EXPECT_NE(output.find("32"), std::string::npos)
        << "Should contain 32 F for 0 C: " << output;
}

TEST_F(WeatherSystemTest, NoisyReadingsStayInRange) {
    Tmp36Sim noisy_sensor(25.0f, 2.0f);  // +/- 2 C noise
    noisy_sensor.setSeed(42);
    WeatherApp app(&sim_, &noisy_sensor);

    for (int i = 0; i < 20; ++i) {
        sim_.setMillis(i * 2000);
        if (i == 0) app.begin(); else app.update();

        float c = app.lastCelsius();
        EXPECT_GE(c, 20.0f) << "Reading " << i << " too low: " << c;
        EXPECT_LE(c, 30.0f) << "Reading " << i << " too high: " << c;
    }
}