Enable scroll through time with mousewheel

Since we pay bills for the last month in the current month...

.gitignore

@@ -1,3 +1,7 @@
 node_modules
 frontend/dist
 build
+bills.db
+main.log
+bills.db-shm
+bills.db-wal

app.go

@@ -2,6 +2,9 @@ package main
 
 import (
 	"context"
+	"time"
+
+	"github.com/wailsapp/wails/v2/pkg/runtime"
 )
 
 // App struct
@@ -19,3 +22,51 @@ func NewApp() *App {
 func (a *App) startup(ctx context.Context) {
 	a.ctx = ctx
 }
+func (a *App) Close() {
+	runtime.Quit(a.ctx)
+}
+
+func (a *App) GetBills() WailsBills {
+	res := WailsBills{}
+	bills, err := service.GetAllBills()
+	if err != nil {
+		res.Success = false
+		res.Error = err.Error()
+		return res
+	}
+	res.Success = true
+	res.Data = bills
+	return res
+}
+func (a *App) GetPaymentsForMonth(month time.Time) WailsPayments {
+	res := WailsPayments{}
+	payments, err := service.GetPaymentsForDate(month)
+	if err != nil {
+		res.Success = false
+		res.Error = err.Error()
+		return res
+	}
+	res.Success = true
+	res.Data = payments
+	return res
+}
+func (a *App) SetPaid(billid int64, month time.Time) WailsPayment {
+	res := WailsPayment{}
+	payment, err := service.MarkPaid(billid, month, time.Now())
+	if err!= nil {
+		res.Success = false
+		res.Error = err.Error()
+		return res
+	}
+	res.Success = true
+	res.Data = payment
+	return res
+}
+
+// These exist only so that wails generates models for Bill and Payment
+func (a *App) EmptyBill() Bill {
+	return Bill{}
+}
+func (a *App) EmptyPayment() Payment {
+	return Payment{}
+}

db.go

@@ -0,0 +1,134 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type DB struct {
+	Ready     bool
+	path      string
+	readConn  *sql.DB
+	writeConn *sql.DB
+}
+
+func (db *DB) Open() error {
+	if db.path == "" {
+		return fmt.Errorf("database path not set")
+	}
+
+	file, err := os.Open(db.path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			log.Printf("Database file does not exist at %s, creating", db.path)
+			file, err := os.Create(db.path)
+			if err != nil {
+				return fmt.Errorf("failed to create database file: %v", err)
+			}
+			log.Printf("Database created at %s", db.path)
+			file.Close()
+		} else {
+			return fmt.Errorf("failed to open database file: %v", err)
+		}
+	}
+	file.Close()
+
+	writeConn, err := sql.Open("sqlite3", db.path+"?_journal=WAL&_synchronous=NORMAL")
+	if err != nil {
+		Error.Printf("%++v", err)
+		return err
+	}
+	writeConn.SetMaxOpenConns(1)
+	writeConn.SetConnMaxIdleTime(30 * time.Second)
+	writeConn.SetConnMaxLifetime(30 * time.Second)
+	db.writeConn = writeConn
+
+	readConn, err := sql.Open("sqlite3", db.path+"?mode=ro&_journal=WAL&_synchronous=NORMAL&_mode=ro")
+	if err != nil {
+		Error.Printf("%++v", err)
+		return err
+	}
+	readConn.SetMaxOpenConns(4)
+	readConn.SetConnMaxIdleTime(30 * time.Second)
+	readConn.SetConnMaxLifetime(30 * time.Second)
+	db.readConn = readConn
+
+	db.Ready = true
+	return nil
+}
+
+func (db *DB) Init(ddl string) error {
+	if !db.Ready {
+		return fmt.Errorf("database not ready")
+	}
+
+	var rows map[string]struct{} = make(map[string]struct{})
+	// TODO: Maybe make this better one day...
+	var expected = map[string]struct{}{
+		"Bill":     {},
+		"Payment":   {},
+	}
+
+	res, err := db.readConn.Query("SELECT name FROM sqlite_master WHERE type='table';")
+	if err != nil {
+		Error.Printf("%++v", err)
+		return err
+	}
+	defer res.Close()
+	for res.Next() {
+		var name string
+		err := res.Scan(&name)
+		if err != nil {
+			Error.Printf("%++v", err)
+			return err
+		}
+		rows[name] = struct{}{}
+	}
+
+	var needsInit bool
+	for table := range expected {
+		if _, ok := rows[table]; !ok {
+			log.Printf("Table %s not found, initializing", table)
+			needsInit = true
+			break
+		}
+	}
+
+	if !needsInit {
+		log.Printf("Database already initialized")
+		return nil
+	}
+
+	_, err = db.writeConn.Exec(ddl)
+	if err != nil {
+		Error.Printf("%++v", err)
+		log.Printf("%#v", "Rolling back")
+		_, err2 := db.writeConn.Exec("ROLLBACK;")
+		if err2 != nil {
+			Error.Printf("Error rolling back! %++v", err)
+		}
+		return err
+	}
+
+	log.Printf("Database init OK")
+	return nil
+}
+
+func (db *DB) Close() error {
+	err := db.writeConn.Close()
+	if err != nil {
+		return err
+	}
+
+	err = db.readConn.Close()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

ddl.sql

@@ -0,0 +1,19 @@
+begin transaction;
+
+create table Bill (
+	id integer PRIMARY KEY AUTOINCREMENT,
+	name TEXT not null
+);
+create index Bill_name on Bill (name);
+
+create table Payment (
+	id integer PRIMARY KEY AUTOINCREMENT,
+	billid integer,
+	monthFor date not null,
+	paymentDate date
+);
+create unique index Payment_billid_monthFor_unique on Payment (billid, monthFor);
+create index Payment_billid on Payment (billid);
+create index Payment_monthFor on Payment (monthFor);
+
+commit;

frontend/index.html

@@ -1,12 +1,15 @@
 <!DOCTYPE html>
 <html lang="en">
+
 <head>
-    <meta charset="UTF-8"/>
-    <meta content="width=device-width, initial-scale=1.0" name="viewport"/>
-    <title>wails-template</title>
+    <meta charset="UTF-8" />
+    <meta content="width=device-width, initial-scale=1.0" name="viewport" />
+    <title>bill-manager</title>
 </head>
+
 <body>
-<div id="app"></div>
-<script src="./src/main.ts" type="module"></script>
+    <div id="app"></div>
+    <script src="./src/main.ts" type="module"></script>
 </body>
+
 </html>

frontend/src/App.svelte

@@ -1,10 +1,36 @@
 <script lang="ts">
-	import Header from "$lib/components/Header.svelte";
+	import { Toaster } from "svelte-sonner";
 	import Router from "$lib/router/Router.svelte";
+	import { Close } from "$wails/main/App";
+	import { scrollingTimeFrameStore } from "$lib/store/scrollingTimeFrameStore";
+
+	function keyDown(event: KeyboardEvent) {
+		if (event.ctrlKey && event.key == "r") {
+			window.location.reload();
+		}
+		if (event.ctrlKey && event.key == "w") {
+			Close();
+		}
+		if (event.key == "ArrowLeft") {
+			scrollingTimeFrameStore.prev();
+		}
+		if (event.key == "ArrowRight") {
+			scrollingTimeFrameStore.next();
+		}
+	}
+	function scroll(event: WheelEvent) {
+		if (event.deltaY < 0) {
+			scrollingTimeFrameStore.next();
+		} else {
+			scrollingTimeFrameStore.prev();
+		}
+	}
 </script>
 
+<svelte:window on:keydown={keyDown} on:wheel={scroll} />
+<Toaster theme="dark" expand visibleToasts={9} />
 <template>
-	<Header />
+	<!-- <Header /> -->
 	<main class="flex-1">
 		<Router />
 	</main>

frontend/src/lib/components/PaymentBillComp.svelte

@@ -0,0 +1,45 @@
+<script lang="ts">
+	import { type PaymentBill } from "$lib/types";
+	import { SetPaid } from "$wails/main/App";
+	import { toast } from "svelte-sonner";
+
+	export let paymentBill: PaymentBill = {
+		id: -1,
+		name: "none",
+		payment: null,
+	};
+	export let monthFor: Date = new Date();
+
+	let paymentDate: string = "";
+	$: {
+		if (!!paymentBill.payment?.paymentDate) {
+			// @ts-ignore Yes split exists... The type is time.Time but it's actually a string
+			// Because typescript is a worthless waste of bytes
+			// And I don't know how to properly convert time.Time to Date or String
+			// So I'm doing this bullshit
+			paymentDate = paymentBill.payment!.paymentDate.split("T")[0];
+		}
+	}
+
+	async function doPaid(event: MouseEvent) {
+		const res = await SetPaid(paymentBill.id, monthFor);
+		if (!res.success) {
+			toast.error(`failed setting paid for ${paymentBill.id} and month ${monthFor} with error ${res.error}`);
+			return;
+		}
+		paymentBill.payment = res.data;
+	}
+</script>
+
+<template>
+	<div class="grid grid-cols-2 w-full text-start px-3 text-xl">
+		<p class={paymentBill.payment == null ? "text-red-700" : ""}>{paymentBill.name}</p>
+		<!-- svelte-ignore a11y-click-events-have-key-events -->
+		<p
+			class="h-[1.6em] cursor-pointer border-2 border-transparent hover:border-solid hover:border-sky-500"
+			on:click={doPaid}
+		>
+			{paymentDate}
+		</p>
+	</div>
+</template>

frontend/src/lib/components/Payments.svelte

@@ -0,0 +1,49 @@
+<script lang="ts">
+	import { billsStore } from "$lib/store/billsStore";
+	import { type PaymentBill } from "$lib/types";
+	import { main } from "$wails/models";
+	import { toast } from "svelte-sonner";
+	import PaymentBillComp from "./PaymentBillComp.svelte";
+
+	export let payments: main.Payment[] = [];
+	export let date: Date = new Date();
+	let dateString: string = date.toISOString()
+	$: {
+		dateString = date.toISOString().split("T")[0]
+		dateString = dateString.split("-").slice(0, 2).join("-");
+	}
+
+	const paymentsModel: { [key: number]: PaymentBill } = {};
+	for (const bill of $billsStore) {
+		paymentsModel[bill[1].id] = {
+			id: bill[1].id,
+			name: bill[1].name,
+			payment: null,
+		};
+	}
+	for (const payment of payments) {
+		const bill = $billsStore.get(payment.billId);
+		if (!!!bill) {
+			toast.error(`Bill not found for id ${payment.billId}`);
+			continue;
+		}
+		paymentsModel[bill.id] = {
+			id: bill.id,
+			name: bill.name,
+			payment: payment,
+		};
+	}
+</script>
+
+<template>
+	<div class="border-double border-2 border-gray-500 m-1">
+		<div class="text-4xl font-bold">
+			{dateString}
+		</div>
+		<div class="">
+			{#each Object.values(paymentsModel) as payment}
+				<PaymentBillComp paymentBill={payment} monthFor={date} />
+			{/each}
+		</div>
+	</div>
+</template>

frontend/src/lib/router/routes/Home.svelte

@@ -1,7 +1,26 @@
 <script lang="ts">
+	import Payments from "$lib/components/Payments.svelte";
+	import { scrollingTimeFrameStore } from "$lib/store/scrollingTimeFrameStore";
+	import { lastMonthPaymentsStore } from "$lib/store/lastMonthPaymentsStore";
+	import { thisMonthPaymentsStore } from "$lib/store/thisMonthPaymentsStore";
 
+	let forceupdate = false;
+	thisMonthPaymentsStore.subscribe(() => {
+		forceupdate = !forceupdate;
+	});
+	lastMonthPaymentsStore.subscribe(() => {
+		forceupdate = !forceupdate;
+	});
 </script>
 
 <template>
-	Hello, world
+	<div class="grid grid-cols-2">
+		{#if forceupdate}
+			<Payments date={$scrollingTimeFrameStore.from} payments={$lastMonthPaymentsStore} />
+			<Payments date={$scrollingTimeFrameStore.to} payments={$thisMonthPaymentsStore} />
+		{:else}
+			<Payments date={$scrollingTimeFrameStore.from} payments={$lastMonthPaymentsStore} />
+			<Payments date={$scrollingTimeFrameStore.to} payments={$thisMonthPaymentsStore} />
+		{/if}
+	</div>
 </template>

frontend/src/lib/store/billsStore.ts

@@ -0,0 +1,37 @@
+import { type Writable, writable } from "svelte/store";
+import { GetBills } from "$wails/main/App";
+import { main } from "$wails/models";
+import { toast } from "svelte-sonner";
+
+async function createStore(): Promise<Writable<Map<number, main.Bill>> & { refresh: Function }> {
+	const bills: Map<number, main.Bill> = new Map<number, main.Bill>();
+	const res = await GetBills();
+	if (!res.success) {
+		toast.error("Error getting bills " + res.error);
+	} else {
+		for (let i = 0; i < res.data.length; i++) {
+			const bill = res.data[i];
+			bills.set(bill.id, bill);
+		}
+	}
+
+	const { subscribe, update, set } = writable(bills);
+	return {
+		subscribe,
+		update,
+		set,
+		refresh: async () => {
+			const res = await GetBills();
+			if (!res.success) {
+				toast.error("Error getting bills " + res.error);
+			} else {
+				for (let i = 0; i < res.data.length; i++) {
+					const bill = res.data[i];
+					bills.set(bill.id, bill);
+				}
+			}
+		},
+	};
+}
+
+export const billsStore = await createStore();

frontend/src/lib/store/lastMonthPaymentsStore.ts

@@ -0,0 +1,34 @@
+import { get, type Writable, writable } from "svelte/store";
+import { GetPaymentsForMonth } from "$wails/main/App";
+import { main } from "$wails/models";
+import { toast } from "svelte-sonner";
+import { scrollingTimeFrameStore } from "$lib/store/scrollingTimeFrameStore";
+
+async function createStore(): Promise<Writable<main.Payment[]>> {
+	const payments: main.Payment[] = [];
+	const res = await GetPaymentsForMonth(get(scrollingTimeFrameStore).from);
+	if (!res.success) {
+		toast.error("Error getting payments " + res.error);
+	} else {
+		payments.push(...res.data);
+	}
+
+	const { subscribe, update, set } = writable(payments);
+	return {
+		subscribe,
+		update,
+		set,
+	};
+}
+
+const lastMonthPaymentsStore = await createStore();
+scrollingTimeFrameStore.subscribe(async (timeframe) => {
+	const res = await GetPaymentsForMonth(timeframe.from);
+	if (!res.success) {
+		toast.error("Error getting payments " + res.error);
+		return;
+	}
+	lastMonthPaymentsStore.set(res.data);
+});
+
+export { lastMonthPaymentsStore };

frontend/src/lib/store/scrollingTimeFrameStore.ts

@@ -0,0 +1,32 @@
+import { type ScrollingTimeframe } from "$lib/types";
+import { type Writable, writable } from "svelte/store";
+
+async function createStore(): Promise<Writable<ScrollingTimeframe> & { next: Function; prev: Function }> {
+	const thism = new Date();
+	const lastm = new Date();
+	thism.setMonth(thism.getMonth() - 1);
+	lastm.setMonth(lastm.getMonth() - 2);
+
+	const { subscribe, update, set } = writable({ from: lastm, to: thism });
+	return {
+		subscribe,
+		update,
+		set,
+		next: () => {
+			update((frame: ScrollingTimeframe) => {
+				frame.from.setMonth(frame.from.getMonth() + 1);
+				frame.to.setMonth(frame.to.getMonth() + 1);
+				return frame;
+			});
+		},
+		prev: () => {
+			update((frame: ScrollingTimeframe) => {
+				frame.from.setMonth(frame.from.getMonth() - 1);
+				frame.to.setMonth(frame.to.getMonth() - 1);
+				return frame;
+			});
+		},
+	};
+}
+
+export const scrollingTimeFrameStore = await createStore();

frontend/src/lib/store/thisMonthPaymentsStore.ts

@@ -0,0 +1,34 @@
+import { get, type Writable, writable } from "svelte/store";
+import { GetPaymentsForMonth } from "$wails/main/App";
+import { main } from "$wails/models";
+import { toast } from "svelte-sonner";
+import { scrollingTimeFrameStore } from "$lib/store/scrollingTimeFrameStore";
+
+async function createStore(): Promise<Writable<main.Payment[]>> {
+	const payments: main.Payment[] = [];
+	const res = await GetPaymentsForMonth(get(scrollingTimeFrameStore).to);
+	if (!res.success) {
+		toast.error("Error getting payments " + res.error);
+	} else {
+		payments.push(...res.data);
+	}
+
+	const { subscribe, update, set } = writable(payments);
+	return {
+		subscribe,
+		update,
+		set,
+	};
+}
+
+const thisMonthPaymentsStore = await createStore();
+scrollingTimeFrameStore.subscribe(async (timeframe) => {
+	const res = await GetPaymentsForMonth(timeframe.to);
+	if (!res.success) {
+		toast.error("Error getting payments " + res.error);
+		return;
+	}
+	thisMonthPaymentsStore.set(res.data);
+});
+
+export { thisMonthPaymentsStore };

frontend/src/lib/types.ts

@@ -0,0 +1,11 @@
+import { main } from "$wails/models";
+
+export type PaymentBill = {
+	id: number;
+	name: string;
+	payment: main.Payment|null;
+};
+export type ScrollingTimeframe = {
+	from: Date;
+	to: Date;
+}

frontend/src/style.css

@@ -1,3 +1,7 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
 html {
     background-color: rgba(27, 38, 54, 1);
     text-align: center;

frontend/wailsjs/go/main/App.d.ts

@@ -0,0 +1,16 @@
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+import {main} from '../models';
+import {time} from '../models';
+
+export function Close():Promise<void>;
+
+export function EmptyBill():Promise<main.Bill>;
+
+export function EmptyPayment():Promise<main.Payment>;
+
+export function GetBills():Promise<main.WailsBills>;
+
+export function GetPaymentsForMonth(arg1:time.Time):Promise<main.WailsPayments>;
+
+export function SetPaid(arg1:number,arg2:time.Time):Promise<main.WailsPayment>;

frontend/wailsjs/go/main/App.js

@@ -0,0 +1,27 @@
+// @ts-check
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+
+export function Close() {
+  return window['go']['main']['App']['Close']();
+}
+
+export function EmptyBill() {
+  return window['go']['main']['App']['EmptyBill']();
+}
+
+export function EmptyPayment() {
+  return window['go']['main']['App']['EmptyPayment']();
+}
+
+export function GetBills() {
+  return window['go']['main']['App']['GetBills']();
+}
+
+export function GetPaymentsForMonth(arg1) {
+  return window['go']['main']['App']['GetPaymentsForMonth'](arg1);
+}
+
+export function SetPaid(arg1, arg2) {
+  return window['go']['main']['App']['SetPaid'](arg1, arg2);
+}

frontend/wailsjs/go/models.ts

@@ -0,0 +1,174 @@
+export namespace main {
+	
+	export class Bill {
+	    id: number;
+	    name: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new Bill(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.id = source["id"];
+	        this.name = source["name"];
+	    }
+	}
+	export class Payment {
+	    id: number;
+	    billId: number;
+	    monthFor: time.Time;
+	    paymentDate: time.Time;
+	
+	    static createFrom(source: any = {}) {
+	        return new Payment(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.id = source["id"];
+	        this.billId = source["billId"];
+	        this.monthFor = this.convertValues(source["monthFor"], time.Time);
+	        this.paymentDate = this.convertValues(source["paymentDate"], time.Time);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	export class WailsBills {
+	    data: Bill[];
+	    success: boolean;
+	    error: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new WailsBills(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.data = this.convertValues(source["data"], Bill);
+	        this.success = source["success"];
+	        this.error = source["error"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	export class WailsPayment {
+	    data: Payment;
+	    success: boolean;
+	    error: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new WailsPayment(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.data = this.convertValues(source["data"], Payment);
+	        this.success = source["success"];
+	        this.error = source["error"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	export class WailsPayments {
+	    data: Payment[];
+	    success: boolean;
+	    error: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new WailsPayments(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.data = this.convertValues(source["data"], Payment);
+	        this.success = source["success"];
+	        this.error = source["error"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+
+export namespace time {
+	
+	export class Time {
+	
+	
+	    static createFrom(source: any = {}) {
+	        return new Time(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	
+	    }
+	}
+
+}
+

go.mod

@@ -1,10 +1,13 @@
-module wails-template
+module bill-manager
 
 go 1.21
 
 toolchain go1.23.0
 
-require github.com/wailsapp/wails/v2 v2.9.1
+require (
+	github.com/mattn/go-sqlite3 v1.14.22
+	github.com/wailsapp/wails/v2 v2.9.1
+)
 
 require (
 	github.com/bep/debounce v1.2.1 // indirect

go.sum

@@ -35,6 +35,8 @@ github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27k
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
 github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
+github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8 h1:KoWmjvw+nsYOo29YJK9vDA65RGE3NrOnUtO7a+RF9HU=
 github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8/go.mod h1:HKlIX3XHQyzLZPlr7++PzdhaXEj94dEiJgZDTsxEqUI=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=

main.go

@@ -2,22 +2,66 @@ package main
 
 import (
 	"embed"
+	"fmt"
+	"io"
+	"log"
+	"os"
 
 	"github.com/wailsapp/wails/v2"
 	"github.com/wailsapp/wails/v2/pkg/options"
 	"github.com/wailsapp/wails/v2/pkg/options/assetserver"
 )
 
+var Error *log.Logger
+var Warning *log.Logger
+
+func init() {
+	log.SetFlags(log.Lmicroseconds | log.Lshortfile)
+	logFile, err := os.Create("main.log")
+	if err != nil {
+		log.Printf("Error creating log file: %v", err)
+		os.Exit(1)
+	}
+	logger := io.MultiWriter(os.Stdout, logFile)
+	log.SetOutput(logger)
+
+	Error = log.New(io.MultiWriter(logFile, os.Stderr, os.Stdout),
+		fmt.Sprintf("%sERROR:%s ", "\033[0;101m", "\033[0m"),
+		log.Lmicroseconds|log.Lshortfile)
+	Warning = log.New(io.MultiWriter(logFile, os.Stdout),
+		fmt.Sprintf("%sWarning:%s ", "\033[0;93m", "\033[0m"),
+		log.Lmicroseconds|log.Lshortfile)
+}
+
 //go:embed all:frontend/dist
 var assets embed.FS
 
+//go:embed ddl.sql
+var ddl string
+var service *BillService
+
 func main() {
+	db := DB{
+		path: "bills.db",
+	}
+	db.Open()
+	defer db.Close()
+	err := db.Init(ddl)
+	if err != nil {
+		Error.Printf("Error initializing database: %v", err)
+		return
+	}
+
+	service = &BillService{
+		db: &db,
+	}
+
 	// Create an instance of the app structure
 	app := NewApp()
 
 	// Create application with options
-	err := wails.Run(&options.App{
-		Title:  "wails-template",
+	err = wails.Run(&options.App{
+		Title:  "bill-manager",
 		Width:  1024,
 		Height: 768,
 		AssetServer: &assetserver.Options{

service.go

@@ -0,0 +1,136 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"time"
+)
+
+type BillService struct {
+	db    *DB
+	bills map[int64]Bill
+}
+
+const paymentColumns = "id, billid, monthFor, paymentDate"
+const billColumns = "id, name"
+
+func (s *BillService) GetPaymentsForDate(date time.Time) ([]Payment, error) {
+	log.Printf("GetPaymentsForDate for %v", date)
+	res := []Payment{}
+	if s == nil {
+		return res, fmt.Errorf("calling GetPaymentsFor on nil BillService")
+	}
+	if s.db == nil || !s.db.Ready {
+		return res, fmt.Errorf("cannot get payments, db is nil or not ready - %v", s.db)
+	}
+
+	rows, err := s.db.readConn.Query(fmt.Sprintf(`
+SELECT %s
+FROM Payment
+WHERE monthFor = date(strftime('%%Y-%%m-01', ?));
+`, paymentColumns), date)
+	if err != nil {
+		return res, fmt.Errorf("query for payments of %s failed with error: %v", date, err)
+	}
+
+	for rows.Next() {
+		payment := Payment{}
+		err = rows.Scan(&payment.Id, &payment.BillId, &payment.MonthFor, &payment.PaymentDate)
+		if err != nil {
+			Error.Printf("failed to scan row: %v", err)
+			continue
+		}
+		res = append(res, payment)
+	}
+
+	return res, nil
+}
+
+func (s *BillService) GetPaymentForBillAndDate(billid int64, date time.Time) (Payment, error) {
+	log.Printf("GetPaymentForBillAndDate for %d and %s", billid, date)
+	res := Payment{}
+	if s == nil {
+		return res, fmt.Errorf("calling GetPaymentsFor on nil BillService")
+	}
+	if s.db == nil || !s.db.Ready {
+		return res, fmt.Errorf("cannot get payments, db is nil or not ready - %v", s.db)
+	}
+
+	row := s.db.readConn.QueryRow(fmt.Sprintf(`
+SELECT %s
+FROM Payment
+WHERE billid = ? AND monthFor = date(strftime('%%Y-%%m-01', ?));
+`, paymentColumns), billid, date)
+
+	err := row.Scan(&res.Id, &res.BillId, &res.MonthFor, &res.PaymentDate)
+	if err != nil {
+		return res, fmt.Errorf("failed scanning row: %v", err)
+	}
+
+	return res, nil
+}
+
+func (s *BillService) GetAllBills() ([]Bill, error) {
+	log.Printf("GetAllBills")
+	res := []Bill{}
+	if s == nil {
+		return res, fmt.Errorf("calling GetAllBills on nil BillService")
+	}
+	if s.db == nil || !s.db.Ready {
+		return res, fmt.Errorf("cannot get bills, db is nil or not ready - %v", s.db)
+	}
+
+	rows, err := s.db.readConn.Query(fmt.Sprintf(`SELECT %s FROM Bill ORDER BY name`, billColumns))
+	if err != nil {
+		return res, fmt.Errorf("failed to query for bills: %w", err)
+	}
+
+	for rows.Next() {
+		bill := Bill{}
+		err := rows.Scan(&bill.Id, &bill.Name)
+		if err != nil {
+			Error.Printf("failed to scan row: %v", err)
+			continue
+		}
+		res = append(res, bill)
+	}
+
+	s.bills = make(map[int64]Bill)
+	for _, bill := range res {
+		s.bills[bill.Id] = bill
+	}
+
+	return res, nil
+}
+
+func (s *BillService) MarkPaid(billid int64, monthFor time.Time, when time.Time) (Payment, error) {
+	log.Printf("MarkPaid for %d, %v and %v", billid, monthFor, when)
+	res := Payment{}
+	if s == nil {
+		return res, fmt.Errorf("calling MarkPaid on nil BillService")
+	}
+	if s.db == nil || !s.db.Ready {
+		return res, fmt.Errorf("cannot mark bill paid, db is nil or not ready - %v", s.db)
+	}
+
+	qres, err := s.db.writeConn.Exec(`
+INSERT INTO Payment (billid, monthFor, paymentDate)
+VALUES (?, date(strftime('%Y-%m-01', ?)), ?)
+ON CONFLICT(billid, monthFor) DO UPDATE SET
+	paymentDate = excluded.paymentDate
+WHERE Payment.paymentDate IS NULL
+	`, billid, monthFor, when)
+	if err != nil {
+		return res, fmt.Errorf("failed upserting into payment with error: %w", err)
+	}
+
+	rows, err := qres.RowsAffected()
+	if err != nil {
+		return res, fmt.Errorf("failed to get rows affected: %w", err)
+	}
+	if rows == 0 {
+		return res, fmt.Errorf("no rows affected")
+	}
+
+	return s.GetPaymentForBillAndDate(billid, monthFor)
+}

types.go

@@ -0,0 +1,32 @@
+package main
+
+import "time"
+
+type (
+	Bill struct {
+		Id   int64  `json:"id"`
+		Name string `json:"name"`
+	}
+	Payment struct {
+		Id          int64     `json:"id"`
+		BillId      int64     `json:"billId"`
+		MonthFor    time.Time `json:"monthFor" time_format:"2006-01-02"`
+		PaymentDate time.Time `json:"paymentDate" time_format:"2006-01-02T15:04:05"`
+	}
+
+	WailsBills struct {
+		Data    []Bill `json:"data"`
+		Success bool   `json:"success"`
+		Error   string `json:"error"`
+	}
+	WailsPayments struct {
+		Data    []Payment `json:"data"`
+		Success bool      `json:"success"`
+		Error   string    `json:"error"`
+	}
+	WailsPayment struct {
+		Data    Payment `json:"data"`
+		Success bool    `json:"success"`
+		Error   string  `json:"error"`
+	}
+)

wails.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://wails.io/schemas/config.v2.json",
-  "name": "wails-template",
-  "outputfilename": "wails-template",
+  "name": "bill-manager",
+  "outputfilename": "bill-manager",
   "frontend:install": "pnpm install",
   "frontend:build": "pnpm build",
   "frontend:dev:watcher": "pnpm dev",