import { createSelector, createSlice, PayloadAction } from '@reduxjs/toolkit';
import { Id, Product } from '@/lib/product';
import { dimensions_t, ProductData } from "@/lib/dimensions_t";
import uuid from "react-native-uuid";
import { RootState } from '@/app/store';
import { Length } from 'convert';

const initialState = {
    products: [] as ProductData[],
    units: "ft",
};

export type UpdateAttribute = {
    product_id: Id,
    attributeKey: string,
    attributeValue: any,
}

export type UpdateAttributeKey = {
    product_id: Id,
    oldKey: string,
    newKey: string,
}

export type AddAttribute = {
    product_id: Id,
}

const cp = (obj: any) => JSON.parse(JSON.stringify(obj));

const productsState = createSlice({
    name: 'products-slice',
    initialState,
    reducers: {
        setUnits(state, action : PayloadAction<Length>) {
            state.units = action.payload;
        },
        createProduct(state, action: PayloadAction<ProductData>) {
            if (!state) {
                return initialState
            }
            const product = action.payload;
            if (!product.id) product.id = uuid.v4().toString();
            state.products = [...state.products, action.payload];
            return state;
        },
        deleteProduct(state, action: PayloadAction<Id>) {
            if (!state) return initialState;
            return {
                ...state,
                products: [...state.products.filter((prod) => {
                    return prod.id?.valueOf() !== action.payload.valueOf();
                })],
            }
        },
        updateAttribute(state, action: PayloadAction<UpdateAttribute>) {
            const { product_id, attributeKey, attributeValue } = action.payload
            if (!state) return initialState;
            return {
                ...state,
                products: state.products.map(prod => {
                    if (prod.id !== product_id) return prod;
                    const attributes = cp(prod.attributes);
                    attributes[attributeKey] = attributeValue;
                    return {
                        ...prod,
                        attributes,
                    }
                })
            };
        },
        changeKey(state, action: PayloadAction<UpdateAttributeKey>) {
            if (!state) return initialState;
            const { product_id, oldKey, newKey } = action.payload

            return {
                ...state,
                products: state.products.map(prod => {
                    if (prod.id !== product_id) return prod;

                    const attributes = cp(prod.attributes);
                    attributes[newKey] = attributes[oldKey];
                    delete attributes[oldKey];
                    attributes.id = prod.id;
                    return {
                        ...prod,
                        attributes,
                    }
                })
            };
        },
        addAttribute(state, action: PayloadAction<Id>) {
            if (!state) return initialState;
            const product_id = action.payload;
            state.products = state.products.map(prod => {
                if (prod.id !== product_id) return prod;
                const i = (Object.keys(prod.attributes || {}).filter(k => k.match(/attribute [\d]+/)) || []).length;
                const newAttribute = `attribute ${i + 1}`;
                return {
                    ...prod,
                    attributes: {
                        ...prod.attributes,
                        [newAttribute]: `value`,
                    }
                }
            });
            return state;
        },

        deleteAttribute(state, action: PayloadAction<{ product_id: Id, attribute: string }>) {
            if (!state) return initialState;
            const { product_id, attribute } = action.payload;
            return {
                ...state,
                products: state.products.map(prod => {
                    if (prod.id !== product_id) return prod;
                    const attributes = Object.fromEntries(Object.entries(prod).filter(([k, v]) => (k !== attribute)));
                    return {
                        ...prod,
                        attributes,
                    }
                }),
            };
        },
        updatePrice(state, action: PayloadAction<{ product_id: Id, pricePerUnit: number }>) {
            if (!state) return initialState;
            const { product_id, pricePerUnit } = action.payload;
            state.products = state.products.map(prod => {
                if (prod.id !== product_id) return prod;
                prod.pricePerUnit = pricePerUnit;
                return prod;
            });
            return state;
        },
        updateDimensions(state, action: PayloadAction<{ product_id: Id, dimensions: dimensions_t }>) {
            if (!state) return initialState;
            const { product_id, dimensions } = action.payload;
            console.log("Changing dimensions: %o", action.payload);
            return {
                ...state,
                products: state.products.map(prod => {
                    if (prod.id !== product_id) return prod;
                    return {
                        ...prod,
                        dimensions,
                    }
                }),
            };
        },

    }
});

export const selectProducts = (state: RootState) => {
    return state.products;
}

export const selectUnits = (state : RootState) => {
    return (state.units || "ft") as Length;
}

export const selectProductIds = createSelector([selectProducts], products => {
    return products.map(p => p.id);
})

export const selectProductAttributes = createSelector([selectProducts], products => {
    return Object.fromEntries(products.map(p => {
        return [
            p.id,
            p.attributesAsList,
        ]
    }))
})

export const actions = {
    ...productsState.actions
};

export const {
    setUnits,
    createProduct,
    deleteProduct,
    changeKey,
    updateAttribute,
    addAttribute,
    deleteAttribute,
    updatePrice,
    updateDimensions,
} = productsState.actions;

export default productsState.reducer;