// gameMode.js - Central coordinator: switches between World and Workshop modes
import { worldState, setPlayerPosition, warpToMap, solvePuzzle, isPuzzleSolved } from './worldState.js';
import { initWorldRenderer, startWorldLoop, stopWorldLoop } from './worldRenderer.js';
import { initWorldInput, destroyWorldInput, setInteractionHandler } from './worldInput.js';
import { getMap } from './maps.js';

// Circuit editor stop function (to stop its render loop when switching modes)
import { stopCircuitLoop } from '../renderer.js';

// Circuit editor modules (registered from app.js to avoid circular deps)
let circuitEditorInit = null;
let circuitEditorDestroy = null;

let currentMode = 'none'; // 'world' | 'workshop'

/**
 * Register the circuit editor's init/destroy functions.
 * Called from app.js so we don't create circular imports.
 */
export function registerCircuitEditor(initFn, destroyFn) {
    circuitEditorInit = initFn;
    circuitEditorDestroy = destroyFn;
}

/**
 * Boot the game — start in world mode
 */
export function startGame() {
    // Set spawn
    const map = getMap(worldState.currentMap);
    if (map && map.spawn) {
        setPlayerPosition(map.spawn.x, map.spawn.y);
    }

    // Wire up interaction handler
    setInteractionHandler(handleInteraction);

    // Enter world mode
    enterWorldMode();
}

// ==================== Mode switching ====================

export function enterWorldMode() {
    if (currentMode === 'world') return;

    // Tear down workshop if active
    if (currentMode === 'workshop') {
        stopCircuitLoop();
        if (circuitEditorDestroy) circuitEditorDestroy();
        hideWorkshopUI();
    }

    currentMode = 'world';
    worldState.mode = 'world';

    showWorldUI();
    initWorldRenderer();
    initWorldInput();
    startWorldLoop();

    console.log('[gameMode] entered world mode');
}

export function enterWorkshopMode() {
    if (currentMode === 'workshop') return;

    // Tear down world
    if (currentMode === 'world') {
        stopWorldLoop();
        destroyWorldInput();
        hideWorldUI();
    }

    currentMode = 'workshop';
    worldState.mode = 'workshop';

    showWorkshopUI();
    if (circuitEditorInit) circuitEditorInit();

    console.log('[gameMode] entered workshop mode');
}

export function getCurrentMode() { return currentMode; }

// ==================== Interaction handler ====================

function handleInteraction(event) {
    switch (event.type) {
        case 'enterWorkshop':
            enterWorkshopMode();
            break;

        case 'puzzleDoor': {
            const inter = event.data;
            if (isPuzzleSolved(inter.puzzleId)) {
                // Already solved — could open door, show message, etc.
                return;
            }
            // For now, show a hint dialog. Later: open puzzle UI
            worldState.dialog = {
                lines: [
                    'This door requires a logic circuit to open.',
                    `Required output pattern: [${inter.requiredOutputs.join(', ')}]`,
                    'Craft a component in your Workshop (TAB)!'
                ],
                currentLine: 0,
                speakerName: 'System'
            };
            worldState.mode = 'dialog';
            break;
        }

        case 'mapExit': {
            const { targetMap, targetX, targetY } = event.data;
            const p = worldState.player;

            // Save return point: where the player is NOW (one tile back from the exit)
            // so when they leave the target map, they return here
            worldState.returnPoints.push({
                fromMap: worldState.currentMap,
                fromX: p.x,
                fromY: p.y
            });

            // If exit has explicit coordinates, use them
            // Otherwise, check for a stored return point for the target map
            if (targetX != null && targetY != null) {
                warpToMap(targetMap, targetX, targetY);
            } else {
                // Pop the most recent return point for this map
                const retIdx = worldState.returnPoints.findLastIndex(
                    rp => rp.fromMap === targetMap
                );
                if (retIdx >= 0) {
                    const ret = worldState.returnPoints[retIdx];
                    worldState.returnPoints.splice(retIdx, 1);
                    warpToMap(ret.fromMap, ret.fromX, ret.fromY);
                } else {
                    // Fallback: use map spawn point
                    const destMap = getMap(targetMap);
                    const sx = destMap?.spawn?.x ?? 0;
                    const sy = destMap?.spawn?.y ?? 0;
                    warpToMap(targetMap, sx, sy);
                }
            }
            console.log(`[gameMode] warped to ${worldState.currentMap} (${worldState.player.x}, ${worldState.player.y})`);
            break;
        }

        case 'openInventory':
            // TODO: inventory UI
            console.log('[gameMode] inventory:', worldState.inventory);
            break;
    }
}

// ==================== UI visibility ====================

function showWorldUI() {
    // Hide workshop-specific elements
    const toolbar = document.getElementById('toolbar');
    const wavePanel = document.getElementById('waveform-panel');
    const canvas = document.getElementById('canvas');

    if (toolbar) toolbar.style.display = 'none';
    if (wavePanel) wavePanel.style.display = 'none';
    if (canvas) {
        canvas.style.top = '0';
        canvas.style.cursor = 'default';
    }

    // Show back-to-world button (hidden since we're IN world)
    const backBtn = document.getElementById('back-to-world-btn');
    if (backBtn) backBtn.style.display = 'none';
}

function hideWorldUI() {
    // Nothing special to hide — canvas stays
}

function showWorkshopUI() {
    const toolbar = document.getElementById('toolbar');
    const canvas = document.getElementById('canvas');

    if (toolbar) toolbar.style.display = 'flex';
    if (canvas) {
        canvas.style.top = '56px';
        canvas.style.cursor = 'default';
    }

    // Show back-to-world button
    const backBtn = document.getElementById('back-to-world-btn');
    if (backBtn) backBtn.style.display = 'flex';
}

function hideWorkshopUI() {
    const toolbar = document.getElementById('toolbar');
    if (toolbar) toolbar.style.display = 'none';

    const backBtn = document.getElementById('back-to-world-btn');
    if (backBtn) backBtn.style.display = 'none';
}