import {AbstractActionManager, AbstractMesh, ActionManager, Observable, Scene, Vector3, WebXRDefaultExperience} from "@babylonjs/core";
import {DiagramEntity, DiagramEntityType, DiagramEvent, DiagramEventType} from "./types/diagramEntity";
import log from "loglevel";

import {appConfigInstance} from "../util/appConfig";
import {buildEntityActionManager} from "./functions/buildEntityActionManager";
import {DefaultScene} from "../defaultScene";
import {DiagramMenuManager} from "./diagramMenuManager";
import {DiagramEventObserverMask} from "./types/diagramEventObserverMask";
import {DiagramObject} from "./diagramObject";
import {getMe} from "../util/me";
import {UserModelType} from "../users/userTypes";
import {vectoxys} from "./functions/vectorConversion";
import {controllerObservable} from "../controllers/controllers";
import {ControllerEvent} from "../controllers/types/controllerEvent";
import {HEX_TO_COLOR_NAME, TEMPLATE_TO_SHAPE} from "../react/types/chatTypes";


export class DiagramManager {
    private readonly _logger = log.getLogger('DiagramManager');
    private readonly _controllerObservable: Observable<ControllerEvent>;
    private readonly _diagramEntityActionManager: ActionManager;
    public readonly onDiagramEventObservable: Observable<DiagramEvent> = new Observable();
    public readonly onUserEventObservable: Observable<UserModelType> = new Observable();
    private readonly _diagramMenuManager: DiagramMenuManager;
    private readonly _scene: Scene;
    private readonly _diagramObjects: Map<string, DiagramObject> = new Map<string, DiagramObject>();
    private readonly _me: string;
    private _moving: number = 10;
    private _i: number = 0;

    public get diagramMenuManager(): DiagramMenuManager {
        return this._diagramMenuManager;
    }

    public setXR(xr: WebXRDefaultExperience): void {
        this._diagramMenuManager.setXR(xr);
    }

    constructor(readyObservable: Observable<boolean>) {
        this._me = getMe();
        this._scene = DefaultScene.Scene;
        this._diagramMenuManager = new DiagramMenuManager(this.onDiagramEventObservable, controllerObservable, readyObservable);
        this._diagramEntityActionManager = buildEntityActionManager(controllerObservable);
        this.onDiagramEventObservable.add(this.onDiagramEvent, DiagramEventObserverMask.FROM_DB, true, this);
        this.onUserEventObservable.add((user) => {
            if (user.id != this._me) {
                this._logger.debug('user event', user);
            }
        });
        window.setInterval(() => {
            this._i++;
            const platform = this._scene.getMeshByName('platform');

            if (!platform || !platform.physicsBody) {
                return;
            }
            if (platform.physicsBody) {
                if ((this._i % this._moving) == 0) {
                    this.onUserEventObservable.notifyObservers(
                        {
                            id: this._me,
                            name: 'me',
                            type: 'user',
                            base: {
                                position: vectoxys(platform.absolutePosition),
                                rotation: vectoxys(platform.absoluteRotationQuaternion.toEulerAngles()),
                                velocity: vectoxys(platform.physicsBody.getLinearVelocity())
                            },
                        }
                    );
                }
                if (platform.physicsBody.getLinearVelocity().length() > 0.01) {
                    this._moving = 1;
                } else {
                    this._moving = 10;
                }

            }


        }, 100);

        document.addEventListener('uploadImage', (event: CustomEvent) => {
            const diagramEntity: DiagramEntity = {
                template: '#image-template',
                image: event.detail.data,
                text: event.detail.name,
                type: DiagramEntityType.ENTITY,
                position: {x: 0, y: 1.6, z: 0},
                rotation: {x: 0, y: Math.PI, z: 0},
                scale: {x: 1, y: 1, z: 1},
            }
            const object = new DiagramObject(this._scene, this.onDiagramEventObservable, {diagramEntity: diagramEntity});
            this._diagramObjects.set(diagramEntity.id, object);

            //const newMesh = buildMeshFromDiagramEntity(diagramEntity, this._scene);
            if (this.onDiagramEventObservable) {
                this.onDiagramEventObservable.notifyObservers({
                    type: DiagramEventType.ADD,
                    entity: diagramEntity
                }, DiagramEventObserverMask.TO_DB);
            }

        });

        // Chat event listeners for AI-powered diagram creation
        document.addEventListener('chatCreateEntity', (event: CustomEvent) => {
            const {entity} = event.detail;
            this._logger.debug('chatCreateEntity', entity);

            // Generate a default label if none is provided
            // Use strict check to allow empty string "" (explicit no label) while still
            // generating labels for undefined/null (user didn't specify)
            if (entity.text === undefined || entity.text === null) {
                entity.text = this.generateDefaultLabel(entity);
                this._logger.debug('Generated default label:', entity.text);
            }

            const object = new DiagramObject(this._scene, this.onDiagramEventObservable, {
                diagramEntity: entity,
                actionManager: this._diagramEntityActionManager
            });
            this._diagramObjects.set(entity.id, object);
            this.onDiagramEventObservable.notifyObservers({
                type: DiagramEventType.ADD,
                entity: entity
            }, DiagramEventObserverMask.TO_DB);
        });

        document.addEventListener('chatRemoveEntity', (event: CustomEvent) => {
            const {target} = event.detail;
            this._logger.debug('chatRemoveEntity', target);
            const entity = this.findEntityByIdOrLabel(target);
            if (entity) {
                const diagramObject = this._diagramObjects.get(entity.id);
                if (diagramObject) {
                    diagramObject.dispose();
                    this._diagramObjects.delete(entity.id);
                    this.onDiagramEventObservable.notifyObservers({
                        type: DiagramEventType.REMOVE,
                        entity: entity
                    }, DiagramEventObserverMask.TO_DB);
                }
            }
        });

        document.addEventListener('chatModifyEntity', (event: CustomEvent) => {
            const {target, updates} = event.detail;
            this._logger.debug('chatModifyEntity', target, updates);
            const entity = this.findEntityByIdOrLabel(target);
            if (entity) {
                const diagramObject = this._diagramObjects.get(entity.id);
                if (diagramObject) {
                    // Apply updates using setters (each setter handles its own DB notification)
                    if (updates.text !== undefined) {
                        diagramObject.text = updates.text;
                    }
                    if (updates.color !== undefined) {
                        diagramObject.color = updates.color;
                    }
                    if (updates.template !== undefined) {
                        diagramObject.template = updates.template;
                    }
                    if (updates.position !== undefined) {
                        diagramObject.position = updates.position;
                    }
                    if (updates.scale !== undefined) {
                        diagramObject.scale = updates.scale;
                    }
                    if (updates.rotation !== undefined) {
                        diagramObject.rotation = updates.rotation;
                    }
                }
            } else {
                this._logger.warn('chatModifyEntity: entity not found:', target);
            }
        });

        document.addEventListener('chatModifyConnection', (event: CustomEvent) => {
            const {target, updates} = event.detail;
            this._logger.debug('chatModifyConnection', target, updates);

            let connection: DiagramEntity | undefined;

            // Check if target is a connection:fromId:toId format
            if (target.startsWith('connection:')) {
                const parts = target.split(':');
                if (parts.length === 3) {
                    const fromId = parts[1];
                    const toId = parts[2];
                    // Find connection by from/to
                    connection = Array.from(this._diagramObjects.values())
                        .map(obj => obj.diagramEntity)
                        .find(e => e.template === '#connection-template' && e.from === fromId && e.to === toId);
                }
            } else {
                // Find by label (text)
                connection = this.findEntityByIdOrLabel(target);
                // Verify it's a connection
                if (connection && connection.template !== '#connection-template') {
                    this._logger.warn('chatModifyConnection: found entity is not a connection:', target);
                    connection = undefined;
                }
            }

            if (connection) {
                const diagramObject = this._diagramObjects.get(connection.id);
                if (diagramObject) {
                    if (updates.text !== undefined) {
                        diagramObject.text = updates.text;
                    }
                    if (updates.color !== undefined) {
                        diagramObject.color = updates.color;
                    }
                }
            } else {
                this._logger.warn('chatModifyConnection: connection not found:', target);
            }
        });

        document.addEventListener('chatListEntities', (event: CustomEvent) => {
            const requestId = event.detail?.requestId;
            this._logger.debug('chatListEntities', requestId ? `(request: ${requestId})` : '');
            const entities = Array.from(this._diagramObjects.values()).map(obj => ({
                id: obj.diagramEntity.id,
                label: obj.diagramEntity.text || '',
                template: obj.diagramEntity.template,
                text: obj.diagramEntity.text || '',
                color: obj.diagramEntity.color,
                position: obj.diagramEntity.position,
                // Include from/to for connections
                from: obj.diagramEntity.from,
                to: obj.diagramEntity.to
            }));
            const responseEvent = new CustomEvent('chatListEntitiesResponse', {
                detail: { entities, requestId },
                bubbles: true
            });
            document.dispatchEvent(responseEvent);
        });

        // Resolve entity label/ID to actual entity ID and label
        document.addEventListener('chatResolveEntity', (event: CustomEvent) => {
            const {target, requestId} = event.detail;
            this._logger.debug('chatResolveEntity', target);
            const entity = this.findEntityByIdOrLabel(target);
            const responseEvent = new CustomEvent('chatResolveEntityResponse', {
                detail: {
                    requestId,
                    target,
                    entityId: entity?.id || null,
                    entityLabel: entity?.text || null,
                    found: !!entity
                },
                bubbles: true
            });
            document.dispatchEvent(responseEvent);
        });

        // Clear all entities from the diagram
        document.addEventListener('chatClearDiagram', () => {
            this._logger.debug('chatClearDiagram - removing all entities');
            const entitiesToRemove = Array.from(this._diagramObjects.keys());
            for (const id of entitiesToRemove) {
                const diagramObject = this._diagramObjects.get(id);
                if (diagramObject) {
                    const entity = diagramObject.diagramEntity;
                    diagramObject.dispose();
                    this._diagramObjects.delete(id);
                    this.onDiagramEventObservable.notifyObservers({
                        type: DiagramEventType.REMOVE,
                        entity: entity
                    }, DiagramEventObserverMask.TO_DB);
                }
            }
            this._logger.debug(`Cleared ${entitiesToRemove.length} entities`);
        });

        // Get current camera position and orientation
        // Camera may be parented to a platform, so we use world-space coordinates
        document.addEventListener('chatGetCamera', () => {
            this._logger.debug('chatGetCamera');
            const camera = this._scene.activeCamera;
            if (!camera) {
                this._logger.warn('No active camera found');
                return;
            }

            // World-space position (accounts for parent transforms)
            const position = camera.globalPosition;

            // World-space forward direction (where camera is looking)
            const forward = camera.getForwardRay(1).direction;

            // World up vector
            const worldUp = new Vector3(0, 1, 0);

            // Compute ground-projected forward (for intuitive forward/back movement)
            // This ignores pitch so looking up/down doesn't affect horizontal movement
            const groundForward = new Vector3(forward.x, 0, forward.z);
            const groundForwardLength = groundForward.length();
            if (groundForwardLength > 0.001) {
                groundForward.scaleInPlace(1 / groundForwardLength);
            } else {
                // Looking straight up/down - use a fallback forward
                groundForward.set(0, 0, -1);
            }

            // Compute right vector (perpendicular to groundForward in XZ plane)
            // Right = Cross(groundForward, worldUp) gives left, so we negate or swap
            const groundRight = Vector3.Cross(worldUp, groundForward).normalize();

            const responseEvent = new CustomEvent('chatGetCameraResponse', {
                detail: {
                    position: {x: position.x, y: position.y, z: position.z},
                    forward: {x: forward.x, y: forward.y, z: forward.z},
                    groundForward: {x: groundForward.x, y: groundForward.y, z: groundForward.z},
                    groundRight: {x: groundRight.x, y: groundRight.y, z: groundRight.z}
                },
                bubbles: true
            });
            document.dispatchEvent(responseEvent);
        });

        this._logger.debug("DiagramManager constructed");
    }

    public get actionManager(): AbstractActionManager {
        return this._diagramEntityActionManager;
    }

    public getDiagramObject(id: string) {
        return this._diagramObjects.get(id);
    }

    public isDiagramObject(mesh: AbstractMesh) {
        return this._diagramObjects.has(mesh?.id)
    }

    public createCopy(id: string): DiagramObject {
        const diagramObject = this._diagramObjects.get(id);
        if (!diagramObject) {
            this._logger.warn('createCopy called with invalid diagram object', id);
            return null;
        }
        const obj = diagramObject.clone();
        return obj;
    }

    public addObject(diagramObject: DiagramObject) {
        this._diagramObjects.set(diagramObject.diagramEntity.id, diagramObject);
    }

    public get config() {
        return appConfigInstance;
    }

    private findEntityByIdOrLabel(target: string): DiagramEntity | null {
        // First try direct ID match
        const byId = this._diagramObjects.get(target);
        if (byId) {
            return byId.diagramEntity;
        }
        // Then try label match (case-insensitive)
        const targetLower = target.toLowerCase();
        for (const [, obj] of this._diagramObjects) {
            if (obj.diagramEntity.text?.toLowerCase() === targetLower) {
                return obj.diagramEntity;
            }
        }
        return null;
    }

    /**
     * Generates a default label for an entity based on its color and shape.
     * Format: "{color} {shape} {number}" e.g., "blue box 1", "red sphere 2"
     * The number is determined by counting existing entities with the same prefix.
     */
    private generateDefaultLabel(entity: DiagramEntity): string {
        // Get color name from hex
        const colorHex = entity.color?.toLowerCase() || '#0000ff';
        const colorName = HEX_TO_COLOR_NAME[colorHex] || 'blue';

        // Get shape name from template
        const shapeName = TEMPLATE_TO_SHAPE[entity.template] || 'box';

        // Create the prefix (e.g., "blue box")
        const prefix = `${colorName} ${shapeName}`;

        // Count existing entities with labels starting with this prefix
        let maxNumber = 0;
        for (const [, obj] of this._diagramObjects) {
            const label = obj.diagramEntity.text?.toLowerCase() || '';
            if (label.startsWith(prefix)) {
                // Extract the number from the end of the label
                const match = label.match(new RegExp(`^${prefix}\\s*(\\d+)$`));
                if (match) {
                    const num = parseInt(match[1], 10);
                    if (num > maxNumber) {
                        maxNumber = num;
                    }
                }
            }
        }

        // Return the next number in sequence
        return `${prefix} ${maxNumber + 1}`;
    }

    private onDiagramEvent(event: DiagramEvent) {
        let diagramObject = this._diagramObjects.get(event?.entity?.id);
        switch (event.type) {
            case DiagramEventType.CLEAR:
                this._diagramObjects.forEach((value) => {

                    value.dispose();
                });
                this._diagramObjects.clear();
                break;
            case DiagramEventType.ADD:
                if (diagramObject) {
                    diagramObject.fromDiagramEntity(event.entity);
                } else {
                    diagramObject = DiagramObject.CreateObject(this._scene,
                        this.onDiagramEventObservable,
                        {diagramEntity: event.entity, actionManager: this._diagramEntityActionManager});
                }
                if (diagramObject) {
                    this._diagramObjects.set(event.entity.id, diagramObject);
                } else {
                    this._logger.error('failed to create diagram object for ', event.entity);
                }
                break;
            case DiagramEventType.REMOVE:
                if (diagramObject) {
                    diagramObject.dispose();
                }
                this._diagramObjects.delete(event?.entity?.id);
                break;
            case DiagramEventType.MODIFY:
                this._logger.debug(event);
                //diagramObject = this._diagramObjects.get(event.entity.id);
                if (diagramObject && event.entity.text && event.entity.text != diagramObject.text) {
                    diagramObject.text = event.entity.text;
                } else {
                    this._logger.warn('Skipping text update for', event);
                }

                if (event.entity.position) {
                    //diagramObject.position = event.entity.position;
                }
                break;
        }
    }
}