import { inject, injectable } from "tsyringe";

import { ContainerHelper } from "@spt-aki/helpers/ContainerHelper";
import { InventoryHelper } from "@spt-aki/helpers/InventoryHelper";
import { ItemHelper } from "@spt-aki/helpers/ItemHelper";
import { WeightedRandomHelper } from "@spt-aki/helpers/WeightedRandomHelper";
import { Inventory } from "@spt-aki/models/eft/common/tables/IBotBase";
import { GenerationData } from "@spt-aki/models/eft/common/tables/IBotType";
import { Item } from "@spt-aki/models/eft/common/tables/IItem";
import { Grid, ITemplateItem } from "@spt-aki/models/eft/common/tables/ITemplateItem";
import { BaseClasses } from "@spt-aki/models/enums/BaseClasses";
import { EquipmentSlots } from "@spt-aki/models/enums/EquipmentSlots";
import { ItemAddedResult } from "@spt-aki/models/enums/ItemAddedResult";
import { ILogger } from "@spt-aki/models/spt/utils/ILogger";
import { DatabaseServer } from "@spt-aki/servers/DatabaseServer";
import { LocalisationService } from "@spt-aki/services/LocalisationService";
import { HashUtil } from "@spt-aki/utils/HashUtil";
import { RandomUtil } from "@spt-aki/utils/RandomUtil";

@injectable()
export class BotWeaponGeneratorHelper
{
    constructor(
        @inject("WinstonLogger") protected logger: ILogger,
        @inject("DatabaseServer") protected databaseServer: DatabaseServer,
        @inject("ItemHelper") protected itemHelper: ItemHelper,
        @inject("RandomUtil") protected randomUtil: RandomUtil,
        @inject("HashUtil") protected hashUtil: HashUtil,
        @inject("InventoryHelper") protected inventoryHelper: InventoryHelper,
        @inject("WeightedRandomHelper") protected weightedRandomHelper: WeightedRandomHelper,
        @inject("LocalisationService") protected localisationService: LocalisationService,
        @inject("ContainerHelper") protected containerHelper: ContainerHelper
    )
    { }

    /**
     * Get a randomized number of bullets for a specific magazine
     * @param magCounts Weights of magazines
     * @param magTemplate magazine to generate bullet count for
     * @returns bullet count number
     */
    public getRandomizedBulletCount(magCounts: GenerationData, magTemplate: ITemplateItem): number
    {
        const randomizedMagazineCount = this.getRandomizedMagazineCount(magCounts);
        const parentItem = this.itemHelper.getItem(magTemplate._parent)[1];
        let chamberBulletCount = 0;
        if (this.magazineIsCylinderRelated(parentItem._name))
        {
            // if we have a CylinderMagazine/SpringDrivenCylinder we count the number of camoras as the _max_count of the magazine is 0
            chamberBulletCount = magTemplate._props.Slots.length;
        }
        else if (parentItem._id === BaseClasses.UBGL)
        {
            // underbarrel launchers can only have 1 chambered grenade
            chamberBulletCount = 1;
        }
        else
        {
            chamberBulletCount = magTemplate._props.Cartridges[0]._max_count;
        }

        /* Get the amount of bullets that would fit in the internal magazine
        * and multiply by how many magazines were supposed to be created */
        return chamberBulletCount * randomizedMagazineCount; 
    }

    /**
     * Get a randomized count of magazines
     * @param magCounts min and max value returned value can be between
     * @returns numerical value of magazine count
     */
    public getRandomizedMagazineCount(magCounts: GenerationData): number
    {
        //const range = magCounts.max - magCounts.min;
        //return this.randomUtil.getBiasedRandomNumber(magCounts.min, magCounts.max, Math.round(range * 0.75), 4);

        return this.weightedRandomHelper.getWeightedValue(magCounts.weights);
    }

    /**
     * Is this magazine cylinder related (revolvers and grenade launchers)
     * @param magazineParentName the name of the magazines parent
     * @returns true if it is cylinder related
     */
    public magazineIsCylinderRelated(magazineParentName: string): boolean
    {
        return ["CylinderMagazine", "SpringDrivenCylinder"].includes(magazineParentName);
    }

    /**
     * Create a magazine using the parameters given
     * @param magazineTpl Tpl of the magazine to create
     * @param ammoTpl Ammo to add to magazine
     * @param magTemplate template object of magazine
     * @returns Item array
     */
    public createMagazineWithAmmo(magazineTpl: string, ammoTpl: string, magTemplate: ITemplateItem): Item[]
    {
        const magazine: Item[] = [{
            _id: this.hashUtil.generate(),
            _tpl: magazineTpl
        }];

        this.itemHelper.fillMagazineWithCartridge(magazine, magTemplate, ammoTpl, 1);

        return magazine;
    }

    /**
     * Add a specific number of cartridges to a bots inventory (defaults to vest and pockets)
     * @param ammoTpl Ammo tpl to add to vest/pockets
     * @param cartridgeCount number of cartridges to add to vest/pockets
     * @param inventory bot inventory to add cartridges to
     * @param equipmentSlotsToAddTo what equipment slots should bullets be added into
     */
    public addAmmoIntoEquipmentSlots(ammoTpl: string, cartridgeCount: number, inventory: Inventory, equipmentSlotsToAddTo: EquipmentSlots[] = [EquipmentSlots.TACTICAL_VEST, EquipmentSlots.POCKETS] ): void
    {
        const ammoItems = this.itemHelper.splitStack({
            _id: this.hashUtil.generate(),
            _tpl: ammoTpl,
            upd: { StackObjectsCount: cartridgeCount }
        });

        for (const ammoItem of ammoItems)
        {
            const result = this.addItemWithChildrenToEquipmentSlot(
                equipmentSlotsToAddTo,
                ammoItem._id,
                ammoItem._tpl,
                [ammoItem],
                inventory);

            if (result === ItemAddedResult.NO_SPACE)
            {
                this.logger.debug(`Unable to add ammo: ${ammoItem._tpl} to bot equipment`);
            }
        }
    }

    /**
     * Get a weapons default magazine template id
     * @param weaponTemplate weapon to get default magazine for
     * @returns tpl of magazine
     */
    public getWeaponsDefaultMagazineTpl(weaponTemplate: ITemplateItem): string
    {
        return weaponTemplate._props.defMagType;
    }

    /**
     * TODO - move into BotGeneratorHelper, this is not the class for it
     * Adds an item with all its children into specified equipmentSlots, wherever it fits.
     * @param equipmentSlots Slot to add item+children into
     * @param parentId 
     * @param parentTpl 
     * @param itemWithChildren Item to add
     * @param inventory Inventory to add item+children into
     * @returns a `boolean` indicating item was added
     */
    public addItemWithChildrenToEquipmentSlot(equipmentSlots: string[], parentId: string, parentTpl: string, itemWithChildren: Item[], inventory: Inventory): ItemAddedResult
    {
        for (const slot of equipmentSlots)
        {
            // Get container to put item into
            const container = inventory.items.find(i => i.slotId === slot);
            if (!container)
            {
                // Desired equipment container (e.g. backpack) not found
                this.logger.debug(`Unable to add item: ${itemWithChildren[0]._tpl} to: ${slot}, slot missing/bot generated without equipment`);
                continue;
            }

            // Get container details from db
            const containerTemplate = this.itemHelper.getItem(container._tpl);
            if (!containerTemplate[0])
            {
                this.logger.error(this.localisationService.getText("bot-missing_container_with_tpl", container._tpl));

                continue;
            }

            if (!containerTemplate[1]._props.Grids?.length)
            {
                // Container has no slots to hold items
                continue;
            }

            const itemSize = this.inventoryHelper.getItemSize(parentTpl, parentId, itemWithChildren);

            for (const slotGrid of containerTemplate[1]._props.Grids)
            {
                // Grid is empty, skip
                if (slotGrid._props.cellsH === 0 || slotGrid._props.cellsV === 0)
                {
                    continue;
                }

                // Can't put item type in grid, skip
                if (!this.itemAllowedInContainer(slotGrid, parentTpl))
                {
                    continue;
                }

                // Get all base level items in backpack
                const containerItems = inventory.items.filter(i => i.parentId === container._id && i.slotId === slotGrid._name);

                // Get a copy of base level items we can iterate over
                const containerItemsToCheck = containerItems.filter(x => x.slotId === slotGrid._name);
                for (const item of containerItemsToCheck)
                {
                    // Look for children on items, insert into array if found
                    // (used later when figuring out how much space weapon takes up)
                    const itemWithChildren = this.itemHelper.findAndReturnChildrenAsItems(inventory.items, item._id);
                    if (itemWithChildren.length > 1)
                    {
                        containerItems.splice(containerItems.indexOf(item), 1, ...itemWithChildren);
                    }
                }

                // Get rid of items free/used spots in current grid
                const slotGridMap = this.inventoryHelper.getContainerMap(slotGrid._props.cellsH, slotGrid._props.cellsV, containerItems, container._id);
                // Try to fit item into grid
                const findSlotResult = this.containerHelper.findSlotForItem(slotGridMap, itemSize[0], itemSize[1]);

                // Open slot found, add item to inventory
                if (findSlotResult.success)
                {
                    const parentItem = itemWithChildren.find(i => i._id === parentId);

                    // Set items parent to container id
                    parentItem.parentId = container._id;
                    parentItem.slotId = slotGrid._name;
                    parentItem.location = {
                        x: findSlotResult.x,
                        y: findSlotResult.y,
                        r: findSlotResult.rotation ? 1 : 0
                    };

                    inventory.items.push(...itemWithChildren);

                    return ItemAddedResult.SUCCESS;
                }

                // Start loop again in next grid of container
            }
        }

        return ItemAddedResult.NO_SPACE;
    }

    /**
     * is the provided item allowed inside a container
     * @param slot location item wants to be placed in
     * @param itemTpl item being placed
     * @returns true if allowed
     */
    protected itemAllowedInContainer(slot: Grid, itemTpl: string): boolean
    {
        const filters = slot._props.filters;

        // Check if item base type is excluded
        if (filters?.length && (filters[0].ExcludedFilter || filters[0].Filter))
        {
            const itemDetails = this.itemHelper.getItem(itemTpl)[1];

            // if item to add is found in exclude filter, not allowed
            if (filters[0].ExcludedFilter.includes(itemDetails._parent))
            {
                return false;
            }

            // if Filter array only contains 1 filter and its for 'item', allowed
            if (filters[0].Filter.length === 1 && filters[0].Filter.includes(BaseClasses.ITEM))
            {
                return true;
            }

            // if allowed filter has something in it + filter doesnt have item, not allowed
            if (filters[0].Filter.length > 0 && !filters[0].Filter.includes(itemDetails._parent))
            {
                return false;
            }
        }

        return true;
    }
}