import { CommandsBase } from './CommandsBase';
import { InventoryFolder } from '../InventoryFolder';
import { InstantMessageDialog } from '../../enums/InstantMessageDialog';
import { ImprovedInstantMessageMessage } from '../messages/ImprovedInstantMessage';
import { Utils } from '../Utils';
import { FolderType } from '../../enums/FolderType';
import { InventoryOfferedEvent } from '../../events/InventoryOfferedEvent';
import { UUID } from '../UUID';
import { Vector3 } from '../Vector3';
import { PacketFlags } from '../../enums/PacketFlags';
import { ChatSourceType } from '../../enums/ChatSourceType';
import { InventoryItem } from '../InventoryItem';

export class InventoryCommands extends CommandsBase
{
    getInventoryRoot(): InventoryFolder
    {
        return this.agent.inventory.getRootFolderMain();
    }
    getLibraryRoot(): InventoryFolder
    {
        return this.agent.inventory.getRootFolderLibrary();
    }
    private async respondToInventoryOffer(event: InventoryOfferedEvent, response: InstantMessageDialog): Promise<void>
    {
        const agentName = this.agent.firstName + ' ' + this.agent.lastName;
        const im: ImprovedInstantMessageMessage = new ImprovedInstantMessageMessage();
        const folderType = (event.type as unknown) as FolderType;
        const folder = this.agent.inventory.findFolderForType(folderType);
        const binary = Buffer.allocUnsafe(16);
        folder.writeToBuffer(binary, 0);

        im.AgentData = {
            AgentID: this.agent.agentID,
            SessionID: this.circuit.sessionID
        };
        im.MessageBlock = {
            FromGroup: false,
            ToAgentID: event.from,
            ParentEstateID: 0,
            RegionID: UUID.zero(),
            Position: Vector3.getZero(),
            Offline: 0,
            Dialog: response,
            ID: event.requestID,
            Timestamp: Math.floor(new Date().getTime() / 1000),
            FromAgentName: Utils.StringToBuffer(agentName),
            Message: Utils.StringToBuffer(''),
            BinaryBucket: binary
        };
        im.EstateBlock = {
            EstateID: 0
        };
        const sequenceNo = this.circuit.sendMessage(im, PacketFlags.Reliable);
        return await this.circuit.waitForAck(sequenceNo, 10000);
    }

    async getInventoryItem(item: UUID | string): Promise<InventoryItem>
    {
        if (typeof item === 'string')
        {
            item = new UUID(item);
        }
        const result = await this.currentRegion.agent.inventory.fetchInventoryItem(item);
        if (result === null)
        {
            throw new Error('Unable to get inventory item');
        }
        else
        {
            return result;
        }
    }

    async acceptInventoryOffer(event: InventoryOfferedEvent): Promise<void>
    {
        if (event.source === ChatSourceType.Object)
        {
            return await this.respondToInventoryOffer(event, InstantMessageDialog.TaskInventoryAccepted);
        }
        else
        {
            return await this.respondToInventoryOffer(event, InstantMessageDialog.InventoryAccepted);
        }
    }

    async rejectInventoryOffer(event: InventoryOfferedEvent): Promise<void>
    {
        if (event.source === ChatSourceType.Object)
        {
            return await this.respondToInventoryOffer(event, InstantMessageDialog.TaskInventoryDeclined);
        }
        else
        {
            return await this.respondToInventoryOffer(event, InstantMessageDialog.InventoryDeclined);
        }
    }
}