#include "PowerFSM.h"
#include "GPS.h"
#include "MeshService.h"
#include "NodeDB.h"
#include "configuration.h"
#include "graphics/Screen.h"
#include "main.h"
#include "sleep.h"
#include "target_specific.h"

static void sdsEnter()
{
    // FIXME - make sure GPS and LORA radio are off first - because we want close to zero current draw
    doDeepSleep(getPref_sds_secs() * 1000LL);
}

#include "error.h"

static uint32_t secsSlept;

static void lsEnter()
{
    DEBUG_MSG("lsEnter begin, ls_secs=%u\n", getPref_ls_secs());
    screen.setOn(false);
    secsSlept = 0; // How long have we been sleeping this time

    DEBUG_MSG("lsEnter end\n");
}

static void lsIdle()
{
    // DEBUG_MSG("lsIdle begin ls_secs=%u\n", getPref_ls_secs());

#ifndef NO_ESP32
    esp_sleep_source_t wakeCause = ESP_SLEEP_WAKEUP_UNDEFINED;

    // Do we have more sleeping to do?
    if (secsSlept < getPref_ls_secs()) {
        // Briefly come out of sleep long enough to blink the led once every few seconds
        uint32_t sleepTime = 30;

        // If some other service would stall sleep, don't let sleep happen yet
        if (doPreflightSleep()) {
            setLed(false); // Never leave led on while in light sleep
            wakeCause = doLightSleep(sleepTime * 1000LL);

            switch (wakeCause) {
            case ESP_SLEEP_WAKEUP_TIMER:
                // Normal case: timer expired, we should just go back to sleep ASAP

                setLed(true);                // briefly turn on led
                wakeCause = doLightSleep(1); // leave led on for 1ms

                secsSlept += sleepTime;
                // DEBUG_MSG("sleeping, flash led!\n");
                break;

            case ESP_SLEEP_WAKEUP_UART:
                // Not currently used (because uart triggers in hw have problems)
                powerFSM.trigger(EVENT_SERIAL_CONNECTED);
                break;

            default:
                // We woke for some other reason (button press, device interrupt)
                // uint64_t status = esp_sleep_get_ext1_wakeup_status();
                DEBUG_MSG("wakeCause %d\n", wakeCause);

#ifdef BUTTON_PIN
                bool pressed = !digitalRead(BUTTON_PIN);
#else
                bool pressed = false;
#endif
                if (pressed) // If we woke because of press, instead generate a PRESS event.
                {
                    powerFSM.trigger(EVENT_PRESS);
                } else {
                    // Otherwise let the NB state handle the IRQ (and that state will handle stuff like IRQs etc)
                    // we lie and say "wake timer" because the interrupt will be handled by the regular IRQ code
                    powerFSM.trigger(EVENT_WAKE_TIMER);
                }
                break;
            }
        } else {
            // Someone says we can't sleep now, so just save some power by sleeping the CPU for 100ms or so
            delay(100);
        }
    } else {
        // Time to stop sleeping!
        setLed(false);
        DEBUG_MSG("reached ls_secs, servicing loop()\n");
        powerFSM.trigger(EVENT_WAKE_TIMER);
    }
#endif
}

static void lsExit()
{
    // setGPSPower(true); // restore GPS power
    gps->forceWake(true);
}

static void nbEnter()
{
    screen.setOn(false);
    setBluetoothEnable(false);

    // FIXME - check if we already have packets for phone and immediately trigger EVENT_PACKETS_FOR_PHONE
}

static void darkEnter()
{
    setBluetoothEnable(true);
    screen.setOn(false);
}

static void serialEnter()
{
    setBluetoothEnable(false);
    screen.setOn(true);
}

static void powerEnter()
{
    screen.setOn(true);
    setBluetoothEnable(true);
    setCPUFast(true); // Set CPU to 240mhz when we're plugged in to wall power.
}

static void powerExit()
{
    screen.setOn(true);
    setBluetoothEnable(true);
    setCPUFast(false); // Set CPU to 80mhz when we're plugged in to wall power.
}

static void onEnter()
{
    screen.setOn(true);
    setBluetoothEnable(true);

    static uint32_t lastPingMs;

    uint32_t now = millis();

    if (now - lastPingMs > 30 * 1000) { // if more than a minute since our last press, ask other nodes to update their state
        if (displayedNodeNum)
            service.sendNetworkPing(displayedNodeNum, true); // Refresh the currently displayed node
        lastPingMs = now;
    }
}

static void screenPress()
{
    screen.onPress();
}

static void bootEnter() {}

State stateSDS(sdsEnter, NULL, NULL, "SDS");
State stateLS(lsEnter, lsIdle, lsExit, "LS");
State stateNB(nbEnter, NULL, NULL, "NB");
State stateDARK(darkEnter, NULL, NULL, "DARK");
State stateSERIAL(serialEnter, NULL, NULL, "SERIAL");
State stateBOOT(bootEnter, NULL, NULL, "BOOT");
State stateON(onEnter, NULL, NULL, "ON");
State statePOWER(powerEnter, NULL, NULL, "POWER");
State stateUNPLUG(powerExit, NULL, NULL, "UNPLUG");

Fsm powerFSM(&stateBOOT);

void PowerFSM_setup()
{
    // If we are not a router and we already have AC power go to POWER state after init, otherwise go to ON
    // We assume routers might be powered all the time, but from a low current (solar) source
    bool isLowPower = radioConfig.preferences.is_low_power;
    bool hasPower = !isLowPower && powerStatus && powerStatus->getHasUSB();
    bool isRouter = radioConfig.preferences.is_router;
    DEBUG_MSG("PowerFSM init, USB power=%d\n", hasPower);
    powerFSM.add_timed_transition(&stateBOOT, hasPower ? &statePOWER : &stateON, 3 * 1000, NULL, "boot timeout");

    // wake timer expired or a packet arrived
    // if we are a router node, we go to NB (no need for bluetooth) otherwise we go to DARK (so we can send message to phone)
    powerFSM.add_transition(&stateLS, isRouter ? &stateNB : &stateDARK, EVENT_WAKE_TIMER, NULL, "Wake timer");

    // Note we don't really use this transition, because when we wake from light sleep we _always_ transition to NB or dark and
    // then it handles things powerFSM.add_transition(&stateLS, &stateNB, EVENT_RECEIVED_PACKET, NULL, "Received packet");

    powerFSM.add_transition(&stateNB, &stateNB, EVENT_RECEIVED_PACKET, NULL, "Received packet, resetting win wake");

    // Handle press events - note: we ignore button presses when in API mode
    powerFSM.add_transition(&stateLS, &stateON, EVENT_PRESS, NULL, "Press");
    powerFSM.add_transition(&stateNB, &stateON, EVENT_PRESS, NULL, "Press");
    powerFSM.add_transition(&stateDARK, &stateON, EVENT_PRESS, NULL, "Press");
    powerFSM.add_transition(&statePOWER, &statePOWER, EVENT_PRESS, screenPress, "Press");
    powerFSM.add_transition(&stateON, &stateON, EVENT_PRESS, screenPress, "Press"); // reenter On to restart our timers
    powerFSM.add_transition(&stateSERIAL, &stateSERIAL, EVENT_PRESS, screenPress,
                            "Press"); // Allow button to work while in serial API

    // Handle critically low power battery by forcing deep sleep
    powerFSM.add_transition(&stateBOOT, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
    powerFSM.add_transition(&stateLS, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
    powerFSM.add_transition(&stateNB, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
    powerFSM.add_transition(&stateDARK, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
    powerFSM.add_transition(&stateON, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");
    powerFSM.add_transition(&stateSERIAL, &stateSDS, EVENT_LOW_BATTERY, NULL, "LowBat");

    powerFSM.add_transition(&stateDARK, &stateON, EVENT_BLUETOOTH_PAIR, NULL, "Bluetooth pairing");
    powerFSM.add_transition(&stateON, &stateON, EVENT_BLUETOOTH_PAIR, NULL, "Bluetooth pairing");

    // if we are a router we don't turn the screen on for these things
    if (!isRouter) {
        // show the latest node when we get a new node db update
        powerFSM.add_transition(&stateNB, &stateON, EVENT_NODEDB_UPDATED, NULL, "NodeDB update");
        powerFSM.add_transition(&stateDARK, &stateON, EVENT_NODEDB_UPDATED, NULL, "NodeDB update");
        powerFSM.add_transition(&stateON, &stateON, EVENT_NODEDB_UPDATED, NULL, "NodeDB update");

        // Show the received text message
        powerFSM.add_transition(&stateLS, &stateON, EVENT_RECEIVED_TEXT_MSG, NULL, "Received text");
        powerFSM.add_transition(&stateNB, &stateON, EVENT_RECEIVED_TEXT_MSG, NULL, "Received text");
        powerFSM.add_transition(&stateDARK, &stateON, EVENT_RECEIVED_TEXT_MSG, NULL, "Received text");
        powerFSM.add_transition(&stateON, &stateON, EVENT_RECEIVED_TEXT_MSG, NULL, "Received text"); // restarts the sleep timer
    }

    powerFSM.add_transition(&stateLS, &stateSERIAL, EVENT_SERIAL_CONNECTED, NULL, "serial API");
    powerFSM.add_transition(&stateNB, &stateSERIAL, EVENT_SERIAL_CONNECTED, NULL, "serial API");
    powerFSM.add_transition(&stateDARK, &stateSERIAL, EVENT_SERIAL_CONNECTED, NULL, "serial API");
    powerFSM.add_transition(&stateON, &stateSERIAL, EVENT_SERIAL_CONNECTED, NULL, "serial API");

    if (!isLowPower) {
        powerFSM.add_transition(&stateLS, &statePOWER, EVENT_POWER_CONNECTED, NULL, "power connect");
        powerFSM.add_transition(&stateNB, &statePOWER, EVENT_POWER_CONNECTED, NULL, "power connect");
        powerFSM.add_transition(&stateDARK, &statePOWER, EVENT_POWER_CONNECTED, NULL, "power connect");
        powerFSM.add_transition(&stateON, &statePOWER, EVENT_POWER_CONNECTED, NULL, "power connect");
        powerFSM.add_transition(&statePOWER, &stateUNPLUG, EVENT_POWER_DISCONNECTED, NULL, "power disconnected");
    }

    powerFSM.add_transition(&statePOWER, &stateON, EVENT_POWER_DISCONNECTED, NULL, "power disconnected");
    powerFSM.add_transition(&stateSERIAL, &stateON, EVENT_POWER_DISCONNECTED, NULL, "power disconnected");

    powerFSM.add_transition(&stateSERIAL, &stateNB, EVENT_SERIAL_DISCONNECTED, NULL, "serial disconnect");

    powerFSM.add_transition(&stateDARK, &stateDARK, EVENT_CONTACT_FROM_PHONE, NULL, "Contact from phone");

    powerFSM.add_transition(&stateNB, &stateDARK, EVENT_PACKET_FOR_PHONE, NULL, "Packet for phone");

    powerFSM.add_timed_transition(&stateON, &stateDARK, getPref_screen_on_secs() * 1000, NULL, "Screen-on timeout");

    powerFSM.add_timed_transition(&stateDARK, &stateNB, getPref_phone_timeout_secs() * 1000, NULL, "Phone timeout");

#ifndef NRF52_SERIES
    // We never enter light-sleep state on NRF52 (because the CPU uses so little power normally)
    powerFSM.add_timed_transition(&stateNB, &stateLS, getPref_min_wake_secs() * 1000, NULL, "Min wake timeout");

    powerFSM.add_timed_transition(&stateDARK, &stateLS, getPref_wait_bluetooth_secs() * 1000, NULL, "Bluetooth timeout");
#endif

    auto meshSds = getPref_mesh_sds_timeout_secs();
    if (meshSds != UINT32_MAX)
        powerFSM.add_timed_transition(&stateLS, &stateSDS, meshSds * 1000, NULL, "mesh timeout");
    // removing for now, because some users don't even have phones
    // powerFSM.add_timed_transition(&stateLS, &stateSDS, getPref_phone_sds_timeout_sec() * 1000, NULL, "phone
    // timeout");

    powerFSM.run_machine(); // run one interation of the state machine, so we run our on enter tasks for the initial DARK state
}