// app.js - Main Application Orchestrator
import * as config from './config.js';
import * as state from './state.js';
import * as ui from './ui.js';
import * as timer from './timer.js';
import camera from './camera.js'; // Default export
import audioManager from './audio.js';
import deepLinkManager from './deeplinks.js';
import * as pushFlic from './pushFlicIntegration.js';

// --- Core Game Actions ---

function startGame() {
    if (state.getPlayers().length < 2) {
        alert('You need at least 2 players to start.');
        return;
    }
    if (state.getGameState() === config.GAME_STATES.SETUP || state.getGameState() === config.GAME_STATES.PAUSED) {
        state.setGameState(config.GAME_STATES.RUNNING);
        audioManager.play('gameStart');
        timer.startTimer();
        ui.updateGameButton();
        ui.renderPlayers(); // Ensure active timer styling is applied
    }
}

function pauseGame() {
    if (state.getGameState() === config.GAME_STATES.RUNNING) {
        state.setGameState(config.GAME_STATES.PAUSED);
        audioManager.play('gamePause');
        timer.stopTimer();
        ui.updateGameButton();
        ui.renderPlayers(); // Ensure active timer styling is removed
    }
}

function resumeGame() {
     if (state.getGameState() === config.GAME_STATES.PAUSED) {
        // Check if there's actually a player with time left
         if (state.findNextPlayerWithTime() === -1) {
             console.log("Cannot resume, no players have time left.");
             // Optionally set state to OVER here
             handleGameOver();
             return;
         }
        state.setGameState(config.GAME_STATES.RUNNING);
        audioManager.play('gameResume');
        timer.startTimer();
        ui.updateGameButton();
        ui.renderPlayers(); // Ensure active timer styling is applied
    }
}

function togglePauseResume() {
    const currentGameState = state.getGameState();
    if (currentGameState === config.GAME_STATES.RUNNING) {
        pauseGame();
    } else if (currentGameState === config.GAME_STATES.PAUSED) {
        resumeGame();
    } else if (currentGameState === config.GAME_STATES.SETUP) {
        startGame();
    } else if (currentGameState === config.GAME_STATES.OVER) {
        resetGame(); // Or just go back to setup? Let's reset.
        startGame();
    }
}

function switchToPlayer(index) {
     if (index >= 0 && index < state.getPlayers().length) {
         const previousIndex = state.getCurrentPlayerIndex();
         if(index !== previousIndex) {
             state.setCurrentPlayerIndex(index);
             audioManager.play('playerSwitch');
             ui.renderPlayers(); // Update UI immediately

             // If the game is running, restart the timer for the new player
             // The timer interval callback will handle the decrementing
             if (state.getGameState() === config.GAME_STATES.RUNNING) {
                 timer.startTimer(); // This clears the old interval and starts anew
             }
         }
     }
}

function nextPlayer() {
    const currentGameState = state.getGameState();
    let newIndex = -1;

    if (currentGameState === config.GAME_STATES.RUNNING) {
        newIndex = state.findNextPlayerWithTimeCircular(1); // Find next with time
    } else {
        // Allow cycling through all players if not running
        const playerCount = state.getPlayers().length;
        if(playerCount > 0) {
            newIndex = (state.getCurrentPlayerIndex() + 1) % playerCount;
        }
    }

    if (newIndex !== -1) {
         switchToPlayer(newIndex);
    } else if (currentGameState === config.GAME_STATES.RUNNING) {
        console.log("NextPlayer: No other player has time remaining.");
        // Optionally handle game over immediately? Timer logic should catch this too.
    }
}

function previousPlayer() {
    const currentGameState = state.getGameState();
     let newIndex = -1;

    if (currentGameState === config.GAME_STATES.RUNNING) {
        newIndex = state.findNextPlayerWithTimeCircular(-1); // Find previous with time
    } else {
         // Allow cycling through all players if not running
         const playerCount = state.getPlayers().length;
         if (playerCount > 0) {
             newIndex = (state.getCurrentPlayerIndex() - 1 + playerCount) % playerCount;
         }
    }

     if (newIndex !== -1) {
         switchToPlayer(newIndex);
     } else if (currentGameState === config.GAME_STATES.RUNNING) {
        console.log("PreviousPlayer: No other player has time remaining.");
     }
}


function handleGameOver() {
    state.setGameState(config.GAME_STATES.OVER);
    audioManager.play('gameOver');
    timer.stopTimer(); // Ensure timer is stopped
    ui.updateGameButton();
    ui.renderPlayers(); // Update to show final state
}

function resetGame() {
    timer.stopTimer(); // Stop timer if running/paused
    state.resetPlayersTime();
    state.setGameState(config.GAME_STATES.SETUP);
    state.setCurrentPlayerIndex(0); // Go back to first player
    audioManager.play('buttonClick'); // Or a specific reset sound?
    ui.updateGameButton();
    ui.renderPlayers();
}

function fullResetApp() {
    timer.stopTimer();
    state.resetToDefaults();
    audioManager.play('gameOver'); // Use game over sound for full reset
    ui.hideResetModal();
    ui.updateGameButton();
    ui.renderPlayers();
}

// --- Event Handlers ---

function handleGameButtonClick() {
    audioManager.play('buttonClick');
    togglePauseResume();
}

function handleSetupButtonClick() {
     audioManager.play('buttonClick');
     if (state.getGameState() === config.GAME_STATES.RUNNING) {
         alert('Please pause the game before editing players.');
         return;
     }
     const currentPlayer = state.getCurrentPlayer();
     if (!currentPlayer) {
         console.warn("Edit clicked but no current player?");
         return; // Or show Add Player modal?
     }
     camera.stopStream(); // Ensure camera is off before opening modal
     ui.showPlayerModal(false, currentPlayer);
}

function handleAddPlayerButtonClick() {
    audioManager.play('buttonClick');
     if (state.getGameState() === config.GAME_STATES.RUNNING) {
         alert('Please pause the game before adding players.');
         return;
     }
     camera.stopStream(); // Ensure camera is off before opening modal
     ui.showPlayerModal(true);
}

function handleResetButtonClick() {
     audioManager.play('buttonClick');
     if (state.getGameState() === config.GAME_STATES.RUNNING) {
         alert('Please pause the game before resetting.');
         return;
     }
     ui.showResetModal();
}

function handlePlayerFormSubmit(event) {
    event.preventDefault();
    audioManager.play('buttonClick');

    const name = ui.elements.playerNameInput.value.trim();
    const timeInMinutes = parseInt(ui.elements.playerTimeInput.value, 10);
    let remainingTimeSeconds = 0; // Default
    const isNewPlayer = ui.elements.modalTitle.textContent === 'Add New Player';
    const currentGameState = state.getGameState();

    if (!name || isNaN(timeInMinutes) || timeInMinutes <= 0) {
        alert('Please enter a valid name and positive time.');
        return;
    }

    // Get remaining time ONLY if editing and game is paused/over
    if (!isNewPlayer && (currentGameState === config.GAME_STATES.PAUSED || currentGameState === config.GAME_STATES.OVER)) {
        const remainingTimeString = ui.elements.playerRemainingTimeInput.value;
        const parsedSeconds = ui.parseTimeString(remainingTimeString);
        if (parsedSeconds === null) { // Check if parsing failed
            alert('Please enter remaining time in MM:SS format (e.g., 05:30).');
            return;
        }
         remainingTimeSeconds = parsedSeconds;
         // Validate remaining time against total time? Optional.
         if (remainingTimeSeconds > timeInMinutes * 60) {
             alert('Remaining time cannot be greater than the total time.');
             return;
         }
    } else {
        // For new players or when editing in setup, remaining time matches total time
        remainingTimeSeconds = timeInMinutes * 60;
    }

    let imageDataUrl = ui.elements.playerImageInput.dataset.capturedImage || null;
    const imageFile = ui.elements.playerImageInput.files[0];

    const saveAction = (finalImageData) => {
        if (isNewPlayer) {
            state.addPlayer(name, timeInMinutes, finalImageData);
            audioManager.play('playerAdded');
        } else {
            const playerIndex = state.getCurrentPlayerIndex();
            // Use 'undefined' for image if no new image is provided, so state.updatePlayer keeps the old one
            const imageArg = finalImageData !== null ? finalImageData : (imageFile || ui.elements.playerImageInput.dataset.capturedImage ? finalImageData : undefined);
            state.updatePlayer(playerIndex, name, timeInMinutes, remainingTimeSeconds, imageArg);
            audioManager.play('playerEdited');
        }
        ui.hidePlayerModal();
        ui.renderPlayers();
        ui.updateGameButton(); // Update in case player count changed for setup state
        camera.stopStream(); // Ensure camera is stopped
    };

    if (!imageDataUrl && imageFile) {
        // Handle file upload: Read file as Data URL
        const reader = new FileReader();
        reader.onload = (e) => saveAction(e.target.result);
        reader.onerror = (e) => {
            console.error("Error reading image file:", e);
            alert("Error processing image file.");
        };
        reader.readAsDataURL(imageFile);
    } else {
        // Handle captured image or no image change
         const currentImage = isNewPlayer ? null : state.getCurrentPlayer()?.image;
         // If imageDataUrl has content (from camera), use it.
         // If not, and no file was selected, keep the current image (by passing undefined to updatePlayer later).
         // If it's a new player and no image, pass null.
        saveAction(imageDataUrl ?? (isNewPlayer ? null : currentImage));
    }
}

function handlePlayerModalCancel() {
    audioManager.play('buttonClick');
    ui.hidePlayerModal();
    camera.stopStream(); // Make sure camera turns off
}

function handleDeletePlayer() {
    audioManager.play('buttonClick');
    const success = state.deletePlayer(state.getCurrentPlayerIndex());
    if (success) {
        audioManager.play('playerDeleted');
        ui.hidePlayerModal();
        ui.renderPlayers();
        ui.updateGameButton(); // Update in case player count dropped below 2
    } else {
        alert('Cannot delete player. Minimum of 2 players required.');
    }
    camera.stopStream();
}

function handleResetConfirm() {
    audioManager.play('buttonClick');
    fullResetApp();
}

function handleResetCancel() {
    audioManager.play('buttonClick');
    ui.hideResetModal();
}

function handleCameraButtonClick(event) {
     event.preventDefault(); // Prevent form submission if inside form
     audioManager.play('buttonClick');
     camera.open(); // Open the camera interface
}

// --- Timer Callbacks ---

function handleTimerTick() {
    // Timer module already updated the state, just need to redraw UI
    ui.renderPlayers();
}

function handlePlayerSwitchOnTimer(newPlayerIndex) {
    // Timer detected current player ran out, found next player
    console.log(`Timer switching to player index: ${newPlayerIndex}`);
    switchToPlayer(newPlayerIndex);
    // Sound is handled in switchToPlayer
}

// --- Camera Callback ---
function handleCameraCapture(imageDataUrl) {
     console.log("Image captured");
     ui.updateImagePreviewFromDataUrl(imageDataUrl);
     // Camera module already closed the camera UI
}

// --- Service Worker and PWA Setup ---

function setupServiceWorker() {
    if ('serviceWorker' in navigator) {
        window.addEventListener('load', () => {
            navigator.serviceWorker.register('/sw.js')
                .then(registration => {
                    console.log('ServiceWorker registered successfully.');

                    // Listen for messages FROM the Service Worker (e.g., Flic actions)
                    navigator.serviceWorker.addEventListener('message', handleServiceWorkerMessage);

                     // Initialize Flic integration (which will try to subscribe)
                    initFlic();

                    // Setup deep links *after* SW might be ready
                    setupDeepLinks();
                })
                .catch(error => {
                    console.error('ServiceWorker registration failed:', error);
                     // Still setup deep links even if SW fails
                    setupDeepLinks();
                     // Maybe inform user push notifications won't work
                });
        });
         // Listen for SW controller changes
        navigator.serviceWorker.addEventListener('controllerchange', () => {
            console.log('Service Worker controller changed, potentially updated.');
            // window.location.reload(); // Consider prompting user to reload
        });

    } else {
        console.warn('ServiceWorker not supported.');
        // Setup deep links anyway
        window.addEventListener('load', setupDeepLinks);
    }
}

function handleServiceWorkerMessage(event) {
     console.log('[App] Message received from Service Worker:', event.data);
    if (event.data?.type === 'flic-action') {
        const { action, button, timestamp } = event.data;
        pushFlic.handleFlicAction(action, button, timestamp);
    }
    else if (event.data?.type === 'ACTION') { // Handle deep link actions sent from SW
         console.log('Received action from service worker via postMessage:', event.data.action);
         deepLinkManager.handleAction(event.data.action);
     }
    // Add other message type handlers if needed
}

// --- Deep Link Setup ---
function setupDeepLinks() {
    deepLinkManager.registerHandler('start', startGame);
    deepLinkManager.registerHandler('pause', pauseGame);
    deepLinkManager.registerHandler('toggle', togglePauseResume);
    deepLinkManager.registerHandler('nextplayer', nextPlayer);
    deepLinkManager.registerHandler('prevplayer', previousPlayer); // Add previous player handler
    deepLinkManager.registerHandler('reset', handleResetButtonClick); // Show confirmation

    // Process initial deep link on load
    deepLinkManager.processDeepLink();

    // Listen for subsequent deep links
    window.addEventListener('hashchange', deepLinkManager.processDeepLink);
    // Also listen for popstate if using history API or query params
    window.addEventListener('popstate', deepLinkManager.processDeepLink);
}

// --- Flic Integration Setup ---
function initFlic() {
     // Define what happens for each Flic button action
    const flicActionHandlers = {
        [config.FLIC_ACTIONS.SINGLE_CLICK]: nextPlayer,
        [config.FLIC_ACTIONS.DOUBLE_CLICK]: previousPlayer, // Map double-click to previous player
        [config.FLIC_ACTIONS.HOLD]: togglePauseResume,
    };
    pushFlic.initPushFlic(flicActionHandlers);
}


// --- Initialization ---

function initialize() {
    console.log("Initializing Game Timer App...");

    // 1. Load saved state or defaults
    state.loadData();

    // 2. Initialize UI (pass carousel swipe handler)
    ui.initUI({
        onCarouselSwipe: (direction) => {
            if (direction > 0) nextPlayer(); else previousPlayer();
        }
    });

    // 3. Initialize Timer (pass callbacks for UI updates/state changes)
    timer.initTimer({
        onTimerTick: handleTimerTick,
        onPlayerSwitch: handlePlayerSwitchOnTimer,
        onGameOver: handleGameOver
    });

    // 4. Initialize Camera (pass elements and capture callback)
    camera.init(
        { // Pass relevant DOM elements
            cameraContainer: ui.elements.cameraContainer,
            cameraView: ui.elements.cameraView,
            cameraCanvas: ui.elements.cameraCanvas,
            cameraCaptureButton: ui.elements.cameraCaptureButton,
            cameraCancelButton: ui.elements.cameraCancelButton
        },
        { // Pass options/callbacks
            onCapture: handleCameraCapture
        }
    );

    // 5. Set up UI Event Listeners that trigger actions
    ui.elements.gameButton.addEventListener('click', handleGameButtonClick);
    ui.elements.setupButton.addEventListener('click', handleSetupButtonClick);
    ui.elements.addPlayerButton.addEventListener('click', handleAddPlayerButtonClick);
    ui.elements.resetButton.addEventListener('click', handleResetButtonClick);
    ui.elements.playerForm.addEventListener('submit', handlePlayerFormSubmit);
    ui.elements.cancelButton.addEventListener('click', handlePlayerModalCancel);
    ui.elements.deletePlayerButton.addEventListener('click', handleDeletePlayer);
    ui.elements.resetConfirmButton.addEventListener('click', handleResetConfirm);
    ui.elements.resetCancelButton.addEventListener('click', handleResetCancel);
    ui.elements.cameraButton.addEventListener('click', handleCameraButtonClick);

    // 6. Setup Service Worker (which also initializes Flic and Deep Links)
    setupServiceWorker();

     // 7. Initial UI Update based on loaded state
    ui.renderPlayers();
    ui.updateGameButton();

    // 8. Resume timer if state loaded as 'running' (e.g., after refresh)
    // Note: This might be undesirable. Usually, a refresh should pause.
    // Consider forcing state to 'paused' or 'setup' on load?
    // For now, let's reset running state to paused on load.
    if (state.getGameState() === config.GAME_STATES.RUNNING) {
        console.log("Game was running on load, setting to paused.");
        state.setGameState(config.GAME_STATES.PAUSED);
        ui.updateGameButton();
        ui.renderPlayers();
    }

    console.log("App Initialized.");
}

// --- Start the application ---
initialize();