/**
 * worldState.js - World game state management
 *
 * Tracks player position, current map, dialog, inventory, puzzles, and other game state
 */

// Default/initial world state
export const worldState = {
    // Current mode
    mode: 'world',  // 'world' | 'workshop' | 'dialog' | 'puzzle'

    // Player
    player: {
        x: 4,
        y: 10,          // tile position in current map
        px: 0,
        py: 0,          // pixel offset for smooth movement (interpolation)
        direction: 'down',  // 'up' | 'down' | 'left' | 'right'
        moving: false,
        frame: 0,       // animation frame (0-3 for walking cycles)
        speed: 150      // milliseconds per tile movement
    },

    // Map
    currentMap: 'lab',

    // Camera
    camera: {
        x: 0,
        y: 0
    },

    // Dialog
    dialog: null,  // { lines: [...], currentLine: 0, speakerName: '' } or null

    // Inventory of crafted components
    inventory: [],  // array of component IDs from customComponents (stored in circuit editor)

    // Puzzle state
    solvedPuzzles: [],  // array of puzzleIds that have been solved
    activePuzzle: null,  // { puzzleId, requiredOutputs, doorX, doorY } or null when no puzzle active

    // Game flags
    flags: {
        // Examples:
        // 'met_professor': false,
        // 'guard_talked': false,
        // 'merchant_met': false
    },

    // Timing
    lastMoveTime: 0,
    animTimer: 0
};

/**
 * Reset world state to initial defaults
 */
export function resetWorldState() {
    worldState.mode = 'world';
    worldState.player.x = 4;
    worldState.player.y = 10;
    worldState.player.px = 0;
    worldState.player.py = 0;
    worldState.player.direction = 'down';
    worldState.player.moving = false;
    worldState.player.frame = 0;
    worldState.currentMap = 'lab';
    worldState.camera.x = 0;
    worldState.camera.y = 0;
    worldState.dialog = null;
    worldState.inventory = [];
    worldState.solvedPuzzles = [];
    worldState.activePuzzle = null;
    worldState.flags = {};
    worldState.lastMoveTime = 0;
    worldState.animTimer = 0;
}

/**
 * Check if player is currently in movement animation
 */
export function isPlayerMoving() {
    return worldState.player.moving;
}

/**
 * Set player position and reset movement state
 */
export function setPlayerPosition(x, y) {
    worldState.player.x = x;
    worldState.player.y = y;
    worldState.player.px = 0;
    worldState.player.py = 0;
    worldState.player.moving = false;
    worldState.player.frame = 0;
}

/**
 * Start a dialog sequence
 */
export function startDialog(lines, speakerName = '') {
    worldState.dialog = {
        lines: Array.isArray(lines) ? lines : [lines],
        currentLine: 0,
        speakerName: speakerName
    };
    worldState.mode = 'dialog';
}

/**
 * Advance dialog to next line
 * Returns false when dialog sequence ends and should be closed
 */
export function advanceDialog() {
    if (!worldState.dialog) return false;

    worldState.dialog.currentLine++;

    // Dialog finished
    if (worldState.dialog.currentLine >= worldState.dialog.lines.length) {
        worldState.dialog = null;
        worldState.mode = 'world';
        return false;
    }

    return true;
}

/**
 * Get current dialog line text
 */
export function getCurrentDialogLine() {
    if (!worldState.dialog) return '';
    return worldState.dialog.lines[worldState.dialog.currentLine] || '';
}

/**
 * Add component to inventory
 */
export function addToInventory(componentId) {
    if (!worldState.inventory.includes(componentId)) {
        worldState.inventory.push(componentId);
    }
}

/**
 * Remove component from inventory
 */
export function removeFromInventory(componentId) {
    const idx = worldState.inventory.indexOf(componentId);
    if (idx !== -1) {
        worldState.inventory.splice(idx, 1);
    }
}

/**
 * Check if component is in inventory
 */
export function hasInInventory(componentId) {
    return worldState.inventory.includes(componentId);
}

/**
 * Mark a puzzle as solved
 */
export function solvePuzzle(puzzleId) {
    if (!worldState.solvedPuzzles.includes(puzzleId)) {
        worldState.solvedPuzzles.push(puzzleId);
    }
}

/**
 * Check if a puzzle has been solved
 */
export function isPuzzleSolved(puzzleId) {
    return worldState.solvedPuzzles.includes(puzzleId);
}

/**
 * Set the active puzzle that player is attempting
 */
export function setActivePuzzle(puzzleId, requiredOutputs, doorX, doorY) {
    worldState.activePuzzle = {
        puzzleId: puzzleId,
        requiredOutputs: requiredOutputs,
        doorX: doorX,
        doorY: doorY
    };
    worldState.mode = 'puzzle';
}

/**
 * Clear the active puzzle
 */
export function clearActivePuzzle() {
    worldState.activePuzzle = null;
    worldState.mode = 'world';
}

/**
 * Get the active puzzle
 */
export function getActivePuzzle() {
    return worldState.activePuzzle;
}

/**
 * Set a game flag
 */
export function setFlag(key, value) {
    worldState.flags[key] = value;
}

/**
 * Get a game flag
 */
export function getFlag(key, defaultValue = false) {
    return worldState.flags[key] !== undefined ? worldState.flags[key] : defaultValue;
}

/**
 * Check if a flag is true
 */
export function isFlagSet(key) {
    return getFlag(key) === true;
}

/**
 * Move player by tile offset (for movement updates)
 * Returns true if movement started, false if blocked
 */
export function movePlayer(dx, dy, isWalkable) {
    if (worldState.player.moving) return false;

    const newX = worldState.player.x + dx;
    const newY = worldState.player.y + dy;

    // Check if new position is walkable
    if (!isWalkable(newX, newY)) {
        return false;
    }

    // Update direction
    if (dx > 0) worldState.player.direction = 'right';
    if (dx < 0) worldState.player.direction = 'left';
    if (dy > 0) worldState.player.direction = 'down';
    if (dy < 0) worldState.player.direction = 'up';

    // Start movement animation
    worldState.player.x = newX;
    worldState.player.y = newY;
    worldState.player.moving = true;
    worldState.player.frame = 0;
    worldState.lastMoveTime = Date.now();

    return true;
}

/**
 * Update player movement animation
 * Call this in game loop, delta is time elapsed in ms
 */
export function updatePlayerAnimation(delta) {
    if (!worldState.player.moving) return;

    const elapsed = Date.now() - worldState.lastMoveTime;
    const progress = Math.min(elapsed / worldState.player.speed, 1);

    // Update pixel offset for smooth movement
    const tileSize = 32;  // Assuming 32x32 tiles
    worldState.player.px = (worldState.player.direction === 'right' ? 1 : worldState.player.direction === 'left' ? -1 : 0) * tileSize * progress;
    worldState.player.py = (worldState.player.direction === 'down' ? 1 : worldState.player.direction === 'up' ? -1 : 0) * tileSize * progress;

    // Update animation frame
    worldState.player.frame = Math.floor(progress * 4) % 4;

    // Movement complete
    if (progress >= 1) {
        worldState.player.moving = false;
        worldState.player.px = 0;
        worldState.player.py = 0;
        worldState.player.frame = 0;
    }
}

/**
 * Warp player to a new map and position
 */
export function warpToMap(mapId, x, y) {
    worldState.currentMap = mapId;
    setPlayerPosition(x, y);
}

/**
 * Get complete world state snapshot (for debugging/saving)
 */
export function getWorldStateSnapshot() {
    return JSON.parse(JSON.stringify(worldState));
}

/**
 * Load world state from snapshot
 */
export function loadWorldStateSnapshot(snapshot) {
    Object.assign(worldState, JSON.parse(JSON.stringify(snapshot)));
}