package de.jotomo.ruffyscripter.commands;

import android.os.SystemClock;

import org.monkey.d.ruffy.ruffy.driver.display.MenuAttribute;
import org.monkey.d.ruffy.ruffy.driver.display.MenuType;
import org.monkey.d.ruffy.ruffy.driver.display.menu.MenuTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import de.jotomo.ruffyscripter.PumpState;
import de.jotomo.ruffyscripter.RuffyScripter;

public class SetTbrCommand implements Command {
    private static final Logger log = LoggerFactory.getLogger(SetTbrCommand.class);

    private final long percentage;
    private final long duration;

    public SetTbrCommand(long percentage, long duration) {
        this.percentage = percentage;
        this.duration = duration;
    }

    @Override
    public List<String> validateArguments() {
        List<String> violations = new ArrayList<>();

        if (percentage % 10 != 0) {
            violations.add("TBR percentage must be set in 10% steps");
        }
        if (percentage < 0 || percentage > 500) {
            violations.add("TBR percentage must be within 0-500%");
        }

        if (percentage != 100) {
            if (duration % 15 != 0) {
                violations.add("TBR duration can only be set in 15 minute steps");
            }
            if (duration > 60 * 24) {
                violations.add("Maximum TBR duration is 24 hours");
            }
        }

        if (percentage == 0 && duration > 120) {
            violations.add("Max allowed zero-temp duration is 2h");
        }

        return violations;
    }

    @Override
    public CommandResult execute(RuffyScripter scripter, PumpState initialPumpState) {
        try {
            enterTbrMenu(scripter);

            boolean tbrPercentInputSuccess = false;
            int tbrPercentInputRetries = 2;
            // Setting TBR percentage/duration works most of the time. Occassionnally though,
            // button presses don't take, e.g. we press down 10 times to go from 100% to 0%
            // but the pump ends on 30%. In that case restarting inputing the TBR, so we start
            // again and push down 3 times.
            // Either our timings are of, or the pump sometimes is sluggish. I suspect the later,
            // based on an error when switching from TBR_SET to TBR_DURATION took more than 1.1s
            // and 4 menu updates were sent before the menu was finally switched. This happened
            // around the time when a running TBR was about to run out. So maybe the pump was busy
            // updating its history records.
            while (!tbrPercentInputSuccess) {
                try {
                    inputTbrPercentage(scripter);
                    // TODO v2 this can probably be removed by now
                    SystemClock.sleep(750);
                    verifyDisplayedTbrPercentage(scripter);
                    tbrPercentInputSuccess = true;
                } catch (CommandException e) {
                    if (tbrPercentInputRetries >= 0) {
                        log.warn("Setting TBR percentage failed, retrying", e);
                        tbrPercentInputRetries--;
                    } else {
                        throw e;
                    }
                }
            }

            if (percentage == 100) {
                cancelTbrAndConfirmCancellationWarning(scripter);
            } else {
                // switch to TBR_DURATION menu by pressing menu key
                scripter.verifyMenuIsDisplayed(MenuType.TBR_SET);
                scripter.pressMenuKey();
                scripter.waitForMenuUpdate();
                scripter.verifyMenuIsDisplayed(MenuType.TBR_DURATION);

                boolean tbrDurationSuccess = false;
                int tbrDurationRetries = 2;
                // see above why we loop here
                while (!tbrDurationSuccess) {
                    try {
                        inputTbrDuration(scripter);
                        // TODO v2 this can probably be removed by now
                        SystemClock.sleep(750);
                        verifyDisplayedTbrDuration(scripter);
                        tbrDurationSuccess = true;
                    } catch (CommandException e) {
                        if (tbrDurationRetries >= 0) {
                            log.warn("Setting TBR duration failed, retrying", e);
                            tbrDurationRetries--;
                        } else {
                            throw e;
                        }
                    }
                }

                // confirm TBR
                scripter.pressCheckKey();
                scripter.waitForMenuToBeLeft(MenuType.TBR_DURATION);
            }

            scripter.verifyMenuIsDisplayed(MenuType.MAIN_MENU,
                    "Pump did not return to MAIN_MEU after setting TBR. " +
                            "Check pump manually, the TBR might not have been set/cancelled.");

            // check main menu shows the same values we just set
            if (percentage == 100) {
                verifyMainMenuShowsNoActiveTbr(scripter);
                return new CommandResult().success(true).enacted(true).message("TBR was cancelled");
            } else {
                verifyMainMenuShowsExpectedTbrActive(scripter);
                return new CommandResult().success(true).enacted(true).message(
                        String.format(Locale.US, "TBR set to %d%% for %d min", percentage, duration));
            }

        } catch (CommandException e) {
            return e.toCommandResult();
        }
    }

    private void enterTbrMenu(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.MAIN_MENU);
        scripter.navigateToMenu(MenuType.TBR_MENU);
        scripter.verifyMenuIsDisplayed(MenuType.TBR_MENU);
        scripter.pressCheckKey();
        scripter.waitForMenuUpdate();
        scripter.verifyMenuIsDisplayed(MenuType.TBR_SET);
    }

    private void inputTbrPercentage(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.TBR_SET);
        long currentPercent = readDisplayedTbrPercentage(scripter);
        log.debug("Current TBR %: " + currentPercent);
        long percentageChange = percentage - currentPercent;
        long percentageSteps = percentageChange / 10;
        boolean increasePercentage = true;
        if (percentageSteps < 0) {
            increasePercentage = false;
            percentageSteps = Math.abs(percentageSteps);
        }
        log.debug("Pressing " + (increasePercentage ? "up" : "down") + " " + percentageSteps + " times");
        for (int i = 0; i < percentageSteps; i++) {
            scripter.verifyMenuIsDisplayed(MenuType.TBR_SET);
            if (increasePercentage) scripter.pressUpKey();
            else scripter.pressDownKey();
            SystemClock.sleep(100);
            log.debug("Push #" + (i + 1));
        }
    }

    private void verifyDisplayedTbrPercentage(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.TBR_SET);
        long displayedPercentage = readDisplayedTbrPercentage(scripter);
        if (displayedPercentage != this.percentage) {
            log.debug("Final displayed TBR percentage: " + displayedPercentage);
            throw new CommandException().message("Failed to set TBR percentage");
        }
    }

    private long readDisplayedTbrPercentage(RuffyScripter scripter) {
        // TODO v2 add timeout? Currently the command execution timeout would trigger if exceeded
        Object percentageObj = scripter.currentMenu.getAttribute(MenuAttribute.BASAL_RATE);
        // this as a bit hacky, the display value is blinking, so we might catch that, so
        // keep trying till we get the Double we want
        while (!(percentageObj instanceof Double)) {
            scripter.waitForMenuUpdate();
            percentageObj = scripter.currentMenu.getAttribute(MenuAttribute.BASAL_RATE);
        }
        return ((Double) percentageObj).longValue();
    }

    private void inputTbrDuration(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.TBR_DURATION);
        long currentDuration = readDisplayedTbrDuration(scripter);
        if (currentDuration % 15 != 0) {
            // The duration displayed is how long an active TBR will still run,
            // which might be something like 0:13, hence not in 15 minute steps.
            // Pressing up will go to the next higher 15 minute step.
            // Don't press down, from 0:13 it can't go down, so press up.
            // Pressing up from 23:59 works to go to 24:00.
            scripter.verifyMenuIsDisplayed(MenuType.TBR_DURATION);
            scripter.pressUpKey();
            scripter.waitForMenuUpdate();
            currentDuration = readDisplayedTbrDuration(scripter);
        }
        log.debug("Current TBR duration: " + currentDuration);
        long durationChange = duration - currentDuration;
        long durationSteps = durationChange / 15;
        boolean increaseDuration = true;
        if (durationSteps < 0) {
            increaseDuration = false;
            durationSteps = Math.abs(durationSteps);
        }
        log.debug("Pressing " + (increaseDuration ? "up" : "down") + " " + durationSteps + " times");
        for (int i = 0; i < durationSteps; i++) {
            scripter.verifyMenuIsDisplayed(MenuType.TBR_DURATION);
            if (increaseDuration) scripter.pressUpKey();
            else scripter.pressDownKey();
            SystemClock.sleep(100);
            log.debug("Push #" + (i + 1));
        }
    }

    private void verifyDisplayedTbrDuration(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.TBR_DURATION);
        long displayedDuration = readDisplayedTbrDuration(scripter);
        if (displayedDuration != duration) {
            log.debug("Final displayed TBR duration: " + displayedDuration);
            throw new CommandException().message("Failed to set TBR duration");
        }
    }

    private long readDisplayedTbrDuration(RuffyScripter scripter) {
        // TODO v2 add timeout? Currently the command execution timeout would trigger if exceeded
        scripter.verifyMenuIsDisplayed(MenuType.TBR_DURATION);
        Object durationObj = scripter.currentMenu.getAttribute(MenuAttribute.RUNTIME);
        // this as a bit hacky, the display value is blinking, so we might catch that, so
        // keep trying till we get the Double we want
        while (!(durationObj instanceof MenuTime)) {
            scripter.waitForMenuUpdate();
            durationObj = scripter.currentMenu.getAttribute(MenuAttribute.RUNTIME);
        }
        MenuTime duration = (MenuTime) durationObj;
        return duration.getHour() * 60 + duration.getMinute();
    }

    private void cancelTbrAndConfirmCancellationWarning(RuffyScripter scripter) {
        // confirm entered TBR
        scripter.verifyMenuIsDisplayed(MenuType.TBR_SET);
        scripter.pressCheckKey();

        // A "TBR CANCELLED alert" is only raised by the pump when the remaining time is
        // greater than 60s (displayed as 0:01, the pump goes from there to finished.
        // We could read the remaining duration from MAIN_MENU, but by the time we're here,
        // the pmup could have moved from 0:02 to 0:01, so instead, check if a "TBR CANCELLED alert"
        // is raised and if so dismiss it
        long inTwoSeconds = System.currentTimeMillis() + 5 * 1000;
        boolean alertProcessed = false;
        while (System.currentTimeMillis() < inTwoSeconds && !alertProcessed) {
            if (scripter.currentMenu.getType() == MenuType.WARNING_OR_ERROR) {
                // Check the raised alarm is TBR CANCELLED, so we're not accidentally cancelled
                // a different that might be raised at the same time.
                // Note that the message is permanently displayed, while the error code is blinking.
                // A wait till the error code can be read results in the code hanging, despite
                // menu updates coming in, so just check the message.
                // TODO v2 this only works when the pump's language is English
                String errorMsg = (String) scripter.currentMenu.getAttribute(MenuAttribute.MESSAGE);
                if (!errorMsg.equals("TBR CANCELLED")) {
                    throw new CommandException().success(false).enacted(false)
                            .message("An alert other than the expected TBR CANCELLED was raised by the pump: "
                                    + errorMsg + ". Please check the pump.");
                }
                // confirm "TBR CANCELLED alert"
                scripter.verifyMenuIsDisplayed(MenuType.WARNING_OR_ERROR);
                scripter.pressCheckKey();
                // dismiss "TBR CANCELLED alert"
                scripter.verifyMenuIsDisplayed(MenuType.WARNING_OR_ERROR);
                scripter.pressCheckKey();
                scripter.waitForMenuToBeLeft(MenuType.WARNING_OR_ERROR);
                alertProcessed = true;
            }
            SystemClock.sleep(10);
        }
    }

    private void verifyMainMenuShowsNoActiveTbr(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.MAIN_MENU);
        Double tbrPercentage = (Double) scripter.currentMenu.getAttribute(MenuAttribute.TBR);
        boolean runtimeDisplayed = scripter.currentMenu.attributes().contains(MenuAttribute.RUNTIME);
        if (tbrPercentage != 100 || runtimeDisplayed) {
            throw new CommandException().message("Cancelling TBR failed, TBR is still set according to MAIN_MENU");
        }
    }

    private void verifyMainMenuShowsExpectedTbrActive(RuffyScripter scripter) {
        scripter.verifyMenuIsDisplayed(MenuType.MAIN_MENU);
        // new TBR set; percentage and duration must be displayed ...
        if (!scripter.currentMenu.attributes().contains(MenuAttribute.TBR) ||
                !scripter.currentMenu.attributes().contains(MenuAttribute.TBR)) {
            throw new CommandException().message("Setting TBR failed, according to MAIN_MENU no TBR is active");
        }
        Double mmTbrPercentage = (Double) scripter.currentMenu.getAttribute(MenuAttribute.TBR);
        MenuTime mmTbrDuration = (MenuTime) scripter.currentMenu.getAttribute(MenuAttribute.RUNTIME);
        // ... and be the same as what we set
        // note that displayed duration might have already counted down, e.g. from 30 minutes to
        // 29 minutes and 59 seconds, so that 29 minutes are displayed
        int mmTbrDurationInMinutes = mmTbrDuration.getHour() * 60 + mmTbrDuration.getMinute();
        if (mmTbrPercentage != percentage || (mmTbrDurationInMinutes != duration && mmTbrDurationInMinutes + 1 != duration)) {
            throw new CommandException().message("Setting TBR failed, TBR in MAIN_MENU differs from expected");
        }
    }

    @Override
    public String toString() {
        return "SetTbrCommand{" +
                "percentage=" + percentage +
                ", duration=" + duration +
                '}';
    }
}