package rosa

import (
	"slices"
	"strings"

	"hakurei.app/internal/pkg"
)

func (t Toolchain) newMeson() (pkg.Artifact, string) {
	const (
		version  = "1.10.1"
		checksum = "w895BXF_icncnXatT_OLCFe2PYEtg4KrKooMgUYdN-nQVvbFX3PvYWHGEpogsHtd"
	)
	return t.New("meson-"+version, 0, []pkg.Artifact{
		t.Load(Python),
		t.Load(Setuptools),
	}, nil, nil, `
cd /usr/src/meson
chmod -R +w meson.egg-info
python3 setup.py \
	install \
	--prefix=/system \
	--root=/work
`, pkg.Path(AbsUsrSrc.Append("meson"), true, pkg.NewHTTPGetTar(
		nil, "https://github.com/mesonbuild/meson/releases/download/"+
			version+"/meson-"+version+".tar.gz",
		mustDecode(checksum),
		pkg.TarGzip,
	))), version
}
func init() {
	artifactsM[Meson] = Metadata{
		f: Toolchain.newMeson,

		Name:        "meson",
		Description: "an open source build system",
		Website:     "https://mesonbuild.com/",
	}
}

// MesonHelper is the [Meson] build system helper.
type MesonHelper struct {
	// Runs after setup.
	ScriptCompileEarly string
	// Runs after compile.
	ScriptCompiled string
	// Runs after install.
	Script string

	// Flags passed to the setup command.
	Setup [][2]string
	// Whether to skip meson test.
	SkipTest bool
}

var _ Helper = new(MesonHelper)

// name returns its arguments joined with '-'.
func (*MesonHelper) name(name, version string) string {
	return name + "-" + version
}

// extra returns hardcoded meson runtime dependencies.
func (*MesonHelper) extra(int) []PArtifact {
	return []PArtifact{
		Python,
		Meson,
		Ninja,

		PkgConfig,
		CMake,
	}
}

// wantsChmod returns false.
func (*MesonHelper) wantsChmod() bool { return false }

// wantsWrite returns false.
func (*MesonHelper) wantsWrite() bool { return false }

// scriptEarly returns the zero value.
func (*MesonHelper) scriptEarly() string { return "" }

// createDir returns false.
func (*MesonHelper) createDir() bool { return false }

// wantsDir requests a new directory in TMPDIR.
func (*MesonHelper) wantsDir() string { return `"$(mktemp -d)"` }

// script generates the cure script.
func (attr *MesonHelper) script(name string) string {
	if attr == nil {
		attr = new(MesonHelper)
	}

	scriptCompiled := attr.ScriptCompiled
	if len(scriptCompiled) > 0 && scriptCompiled[0] != '\n' {
		scriptCompiled = "\n" + scriptCompiled
	}

	var scriptTest string
	if !attr.SkipTest {
		scriptTest = `
meson test \
	--print-errorlogs`
	}

	return `
cd "$(mktemp -d)"
meson setup \
	` + strings.Join(slices.Collect(func(yield func(string) bool) {
		for _, v := range append([][2]string{
			{"prefix", "/system"},
			{"buildtype", "release"},
		}, attr.Setup...) {
			s := "-" + v[0]
			if len(v[0]) > 0 && v[0][0] != 'D' {
				s = "-" + s
			}
			if v[1] != "" {
				s += "=" + v[1]
			}
			if !yield(s) {
				return
			}
		}
	}), " \\\n\t") + ` \
	. '/usr/src/` + name + `'
meson compile` + scriptCompiled + scriptTest + `
meson install \
	--destdir=/work
` + attr.Script
}