// Genererar dokumentationens skärmdumpar deterministiskt:
//
//	go run ./tools/shots
//
// Bygger debug-binären, kör den med -script för varje bild och skriver
// PNG:er till doc/img/. Kör om detta när grafik eller UI ändrats, och
// committa bilderna – README och wikin pekar på dem.
package main

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
)

type shot struct {
	file   string
	level  string
	script string
}

var shots = []shot{
	{"menu.png", "", "wait 10; shot %s; quit"},
	{"level-001.png", "001-flygplatsen", "move right 4; move down 2; wait 5; shot %s; quit"},
	{"level-002.png", "002-shinjuku", "move down 6; move right 4; wait 5; shot %s; quit"},
	{"result.png", "001-flygplatsen",
		"move down 2; move right 2; move down 2; move left 2; move down 4; move right 17; move down 1; move left 1; wait 15; shot %s; quit"},
}

func main() {
	root := repoRoot()
	out := filepath.Join(root, "doc", "img")
	must(os.MkdirAll(out, 0o755))

	build := exec.Command("go", "run", "./tools/build", "-mode", "debug")
	build.Dir, build.Stdout, build.Stderr = root, os.Stdout, os.Stderr
	must(build.Run())

	exe := filepath.Join(root, "build", "debug", "metro-puzzle-jp")
	if runtime.GOOS == "windows" {
		exe += ".exe"
	}
	for _, s := range shots {
		args := []string{"-script", fmt.Sprintf(s.script, filepath.Join(out, s.file))}
		if s.level != "" {
			args = append(args, "-level", s.level)
		}
		run := exec.Command(exe, args...)
		run.Dir, run.Stdout, run.Stderr = filepath.Dir(exe), os.Stdout, os.Stderr
		if err := run.Run(); err != nil {
			fail(fmt.Errorf("%s: %w", s.file, err))
		}
	}
	fmt.Println("klart:", out)
}

func repoRoot() string {
	dir, _ := os.Getwd()
	for {
		if _, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil {
			return dir
		}
		parent := filepath.Dir(dir)
		if parent == dir {
			fail(fmt.Errorf("hittade ingen go.mod"))
		}
		dir = parent
	}
}

func must(err error) {
	if err != nil {
		fail(err)
	}
}

func fail(err error) {
	fmt.Fprintln(os.Stderr, "shots:", err)
	os.Exit(1)
}