#!/usr/bin/env bash

name=day-"$1"

if [ -d day-"$name" ]; then
    echo "program $name already exists"
    exit 1
fi

mkdir -p "$name"/cmd/cli/testdata \
	"$name"/testdata "$name"/internal/one/testdata "$name"/internal/two/testdata
touch "$name"/makefile

cat <<EOT >> "$name"/makefile
program = $name

GO = go
SRC_DIR := src
BIN_DIR := bin

EXE := \$(BIN_DIR)/\$(program)

.DEFAULT_GOAL := build

.PHONY: fmt vet build bench clean
fmt:        
	\$(GO) fmt ./...

vet: fmt        
	\$(GO) vet ./...

build: vet | \$(BIN_DIR)
	\$(GO) build -o \$(EXE) ./\$(SRC_DIR)

bench:
	\$(GO) test ./internal/one/ -bench=. > internal/one/benchmark
	\$(GO) test ./internal/two/ -bench=. > internal/two/benchmark
	\$(GO) test . -count=10 -bench=. > benchmark

\$(BIN_DIR):
	@mkdir -p \$@

clean:
	@rm -rv \$(BIN_DIR)
EOT

cat <<EOT >> "$name"/cmd/cli/main.go
/********************************************************************************
    Advent of Code 2024 - $name
********************************************************************************/

package main

func main() {
    
}
EOT

touch "$name"/solve.go
cat <<EOT >> "$name"/solve.go
package name

import (
	"github.com/onyx-and-iris/aoc2024/day-$1/internal/one"
	"github.com/onyx-and-iris/aoc2024/day-$1/internal/two"
)

func Solve(buf []byte) (int, int, error) {
	answerOne, err := one.Solve(buf)
	if err != nil {
		return 0, 0, err
	}

	answerTwo, err := two.Solve(buf)
	if err != nil {
		return 0, 0, err
	}

	return answerOne, answerTwo, nil
}
EOT

touch "$name"/internal/one/solve.go
cat <<EOT >> "$name"/internal/one/solve.go
package one

import (
	"bufio"
	"bytes"
	"io"
)

func Solve(buf []byte) (int, error) {
	r := bytes.NewReader(buf)
	err := parseLines(r)
	if err != nil {
		return 0, err
	}

	return 0, nil
}

func parseLines(r io.Reader) error {
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
	}

	if err := scanner.Err(); err != nil {
		return err
	}

	return nil
}
EOT

touch "$name"/internal/one/solve_internal_test.go
cat <<EOT >> "$name"/internal/one/solve_internal_test.go
package one

import (
	_ "embed"
	"os"
	"testing"
)

//go:embed testdata/input.txt
var data []byte

func BenchmarkSolve(b *testing.B) {
	os.Stdout, _ = os.Open(os.DevNull)
	Solve(data)
}
EOT


touch "$name"/internal/two/solve.go
cat <<EOT >> "$name"/internal/two/solve.go
package two

import (
	"bufio"
	"bytes"
	"io"
)

func Solve(buf []byte) (int, error) {
	r := bytes.NewReader(buf)
	err := parseLines(r)
	if err != nil {
		return 0, err
	}

	return 0, nil
}

func parseLines(r io.Reader) error {
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
	}

	if err := scanner.Err(); err != nil {
		return err
	}

	return nil
}
EOT

touch "$name"/internal/two/solve_internal_test.go
cat <<EOT >> "$name"/internal/two/solve_internal_test.go
package two

import (
	_ "embed"
	"os"
	"testing"
)

//go:embed testdata/input.txt
var data []byte

func BenchmarkSolve(b *testing.B) {
	os.Stdout, _ = os.Open(os.DevNull)
	Solve(data)
}
EOT


cd "$name" || exit

go mod init github.com/onyx-and-iris/aoc2024/"$name"

MKFILES=../mkfiles.sh
[[ -f $MKFILES ]] && ln -s $MKFILES .