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

export const DEFAULT_UNITS: Length = "ft";

export type PlywoodCalculationState = {
  product?: Id | null;
  units: Length;
};

export type CarpetCalculationState = {
  product?: Id | null;
  length: length_t;
  inner_d: length_t;
  outer_d: length_t;
};

export type AppStoreState = {
  products: Product[];
  calculations?: {
    plywood: PlywoodCalculationState;
    carpet: CarpetCalculationState;
  };
};

export const DEFAULT_PRELOADED_STATE = {
  products: [] as Product[],
  calculations: {
    plywood: {
      product: undefined,
      units: DEFAULT_UNITS,
    },
    carpet: {
      product: undefined,
      length: {
        l: 0,
        u: DEFAULT_UNITS,
      },
      inner_d: {
        l: 0,
        u: DEFAULT_UNITS,
      },
      outer_d: {
        l: 0,
        u: DEFAULT_UNITS,
      },
    },
  },
} as AppStoreState;

const initialState: AppStoreState = DEFAULT_PRELOADED_STATE;

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: {
    setPlywoodCalculation(
      state,
      action: PayloadAction<PlywoodCalculationState>
    ) {
      if (!state) {
        return initialState;
      }
      const newCalc = action.payload;
      state.calculations.plywood = newCalc;
      return state;
    },
    setCarpetCalculation(state, action: PayloadAction<CarpetCalculationState>) {
      if (!state) {
        return initialState;
      }
      const newCalc = action.payload;
      state.calculations.carpet = newCalc;
      return state;
    },
    createProduct(state, action: PayloadAction<Product>) {
      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 selectPlywoodCalc = (state: RootState) => {
  return state.calculations.plywood;
};

export const selectCarpetCalc = (state: RootState) => {
  return state.calculations.carpet;
};

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.attributes ? attributesAsList(p.attributes) : []];
      })
    );
  }
);

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

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

export default productsState.reducer;