import { defineStore } from "pinia";
import { GET, POST } from "../api";
import { useBudgetsStore } from "./budget";
import { useSessionStore } from "./session";
import { useTransactionsStore } from "./transactions";

interface State {
    Accounts: Map<string, Account>;
    CurrentAccountID: string | null;
    Categories: Map<string, Category>;
    Months: Map<number, Map<number, Map<string, Category>>>;
    Available: Map<number, Map<number, number>>;
    Assignments: [];
}

export interface Account {
    ID: string;
    Name: string;
    OnBudget: boolean;
    IsOpen: boolean;
    ClearedBalance: number;
    WorkingBalance: number;
    ReconciledBalance: number;
    Transactions: string[];
    LastReconciled: NullDate;
}

interface NullDate {
    Valid: boolean;
    Time: Date;
}

export interface Category {
    ID: string;
    Group: string;
    Name: string;
    AvailableLastMonth: number;
    Assigned: number;
    Activity: number;
}

interface BudgetedAmounts {
    Assigned: number,
    Deassigned: number,
    Spent: number,
    Income: number,
}

export const useAccountStore = defineStore("budget/account", {
    state: (): State => ({
        Accounts: new Map<string, Account>(),
        CurrentAccountID: null,
        Months: new Map<number, Map<number, Map<string, Category>>>(),
        Available: new Map<number, Map<number, number>>(),
        Categories: new Map<string, Category>(),
        Assignments: [],
    }),
    getters: {
        AccountsList(state) {
            return [...state.Accounts.values()];
        },
        AllCategoriesForMonth: (state) => (year: number, month: number) => {
            const yearMap = state.Months.get(year);
            const monthMap = yearMap?.get(month);
            return [...(monthMap?.values() || [])];
        },
        GetCategoryAvailable(state) {
            return (category: Category): number => {
                return (
                    category.AvailableLastMonth +
                    category.Assigned +
                    category.Activity
                );
            };
        },
        GetIncomeCategoryID(state) {
            const budget = useBudgetsStore();
            return budget.CurrentBudget?.IncomeCategoryID;
        },
        GetBudgeted(state) {
            return (year: number, month: number) : BudgetedAmounts => {
                const IncomeCategoryID = this.GetIncomeCategoryID;
                if (IncomeCategoryID == null) return {Spent: 0, Income: 0, Assigned: 0, Deassigned: 0};

                const categories = this.AllCategoriesForMonth(year, month);

                let assigned = 0, deassigned = 0;
                let spent = 0, income = 0;
                for (const category of categories) {
                    if (category.ID == IncomeCategoryID)
                        continue;
                    
                    if(category.Activity > 0)
                        income += category.Activity;
                    else
                        spent += category.Activity;
                    if(category.Assigned > 0)
                        assigned += category.Assigned;
                    else
                        deassigned += category.Assigned;
                }
                return {
                    Assigned: assigned,
                    Deassigned: deassigned,
                    Spent: spent,
                    Income: income
                };
            };
        },
        GetIncomeAvailable(state) {
            return (year: number, month: number) => {
                const yearMapAv = this.Available.get(year);
                return yearMapAv?.get(month);
            };
        },
        CategoryGroupsForMonth(state) {
            return (year: number, month: number) => {
                const categories = this.AllCategoriesForMonth(year, month);
                const categoryGroups = [];
                let prev = undefined;
                for (const category of categories) {
                    //if (category.ID == this.GetIncomeCategoryID) continue;

                    if (prev == undefined || category.Group != prev.Name) {
                        prev = {
                            Name: category.Group,
                            Available: this.GetCategoryAvailable(category),
                            AvailableLastMonth: category.AvailableLastMonth,
                            Activity: category.Activity,
                            Assigned: category.Assigned,
                        };
                        categoryGroups.push({
                            ...prev,
                            Expand: prev.Name != "Hidden Categories",
                        });
                    } else {
                        categoryGroups[categoryGroups.length - 1].Available +=
                            this.GetCategoryAvailable(category);
                        categoryGroups[
                            categoryGroups.length - 1
                        ].AvailableLastMonth += category.AvailableLastMonth;
                        categoryGroups[categoryGroups.length - 1].Activity +=
                            category.Activity;
                        categoryGroups[categoryGroups.length - 1].Assigned +=
                            category.Assigned;
                        continue;
                    }
                }
                return categoryGroups;
            };
        },
        CategoriesForMonthAndGroup(state) {
            return (year: number, month: number, group: string) => {
                const categories = this.AllCategoriesForMonth(year, month);
                return categories.filter((x) => x.Group == group);
            };
        },
        GetAccount(state) {
            return (accountid: string) => {
                return this.Accounts.get(accountid);
            };
        },
        CurrentAccount(state): Account | undefined {
            if (state.CurrentAccountID == null) return undefined;

            return this.GetAccount(state.CurrentAccountID);
        },
        OnBudgetAccounts(state) {
            return [...state.Accounts.values()].filter((x) => x.OnBudget);
        },
        OnBudgetAccountsBalance(state): number {
            return this.OnBudgetAccounts.reduce(
                (prev, curr) => prev + Number(curr.ClearedBalance),
                0
            );
        },
        OffBudgetAccounts(state) {
            return [...state.Accounts.values()].filter((x) => !x.OnBudget);
        },
        OffBudgetAccountsBalance(state): number {
            return this.OffBudgetAccounts.reduce(
                (prev, curr) => prev + Number(curr.ClearedBalance),
                0
            );
        },
    },
    actions: {
        async SetCurrentAccount(budgetid: string, accountid: string) {
            if (budgetid == null) return;

            this.CurrentAccountID = accountid;

            if (accountid == null) return;
            const account = this.GetAccount(accountid)!;
            useSessionStore().setTitle(account.Name);
            await this.FetchAccount(account);
        },
        async FetchAccount(account: Account) {
            const result = await GET(
                "/account/" + account.ID + "/transactions"
            );
            const response = await result.json();
            const transactionsStore = useTransactionsStore();
            transactionsStore.AddTransactions(
                response.Transactions
            );
        },
        async FetchMonthBudget(budgetid: string, year: number, month: number) {
            const result = await GET(
                "/budget/" + budgetid + "/" + year + "/" + (month + 1)
            );
            const response = await result.json();
            if (
                response.Categories == undefined ||
                response.Categories.length <= 0
            )
                return;
            this.addCategoriesForMonth(year, month, response.Categories, response.AvailableBalance);
        },
        async EditAccount(
            accountid: string,
            name: string,
            onBudget: boolean,
            isOpen: boolean
        ) {
            const result = await POST(
                "/account/" + accountid,
                JSON.stringify({
                    name: name,
                    onBudget: onBudget,
                    isOpen: isOpen,
                })
            );
            const response = await result.json();
            useBudgetsStore().MergeBudgetingData(response);

            if (!isOpen) {
                this.Accounts.delete(accountid);
            }
        },
        addCategoriesForMonth(
            year: number,
            month: number,
            categories: Category[],
            available: number
        ): void {
            this.$patch((state) => {
                const yearMap =
                    state.Months.get(year) ||
                    new Map<number, Map<string, Category>>();
                const monthMap =
                    yearMap.get(month) || new Map<string, Category>();
                for (const category of categories) {
                    monthMap.set(category.ID, category);
                }

                yearMap.set(month, monthMap);
                state.Months.set(year, yearMap);

                const yearMapAv =
                    state.Available.get(year) ||
                    new Map<number, number>();
                yearMapAv.set(month, available);
                state.Available.set(year, yearMapAv);
            });
        },
        logout() {
            this.$reset();
        },
    },
});