// Package e2e cross-validates the emitted Zeta artifacts against the REAL
// Zeta Lua loaders: the arch-binary package.lua through ZETA/lib/manifest.lua
// and the arch-src .recipe through zeta-toolchain/toolchain/lib/recipe.lua.
//
// The converters are driven as packages (not via the CLI), so this runs
// under plain `go test` with no built binary. Everything lands in
// t.TempDir(); the only absolute paths are the two loader library roots,
// which live in sibling repositories and cannot be expressed relative to
// this module.
package e2e

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"testing"

	"git.spectoria.dev/huntedbytheirs/zeta-reconstruct/internal/arch/binary"
	"git.spectoria.dev/huntedbytheirs/zeta-reconstruct/internal/arch/src"
	"git.spectoria.dev/huntedbytheirs/zeta-reconstruct/internal/registry"
)

const (
	// manifestLibRoot lets a Lua probe require("manifest") from the ZETA
	// library checkout.
	manifestLibRoot = "/home/specter/Public/ZETA/lib/?.lua"
	// recipeLibRoot lets a Lua probe require("recipe") from the
	// zeta-toolchain library checkout.
	recipeLibRoot = "/home/specter/Public/zeta-toolchain/toolchain/lib/?.lua"
)

// runLua executes script with the `lua` interpreter and returns its output.
// The whole suite is skipped when lua is not installed.
func runLua(t *testing.T, script string) (string, error) {
	t.Helper()
	lua, err := exec.LookPath("lua")
	if err != nil {
		t.Skipf("lua not installed: %v", err)
	}
	out, err := exec.Command(lua, "-e", script).Output()
	return string(out), err
}

// manifestProbe returns a Lua script that loads the manifest at path through
// the real ZETA manifest.load. assert makes a nil,nil-err result a hard
// failure (non-zero exit), so exit code 0 proves load+normalize succeeded.
// The trailing ";" separates our component from the default package.path.
func manifestProbe(path string) string {
	return fmt.Sprintf(
		`package.path=%q..package.path; local m=require("manifest"); assert(m.load(%q))`,
		manifestLibRoot+";", path,
	)
}

// recipeProbe returns a Lua script that loads the recipe at path through the
// real zeta-makepkg recipe.load, with the same assert semantics.
func recipeProbe(path string) string {
	return fmt.Sprintf(
		`package.path=%q..package.path; local r=require("recipe"); assert(r.load(%q))`,
		recipeLibRoot+";", path,
	)
}

// TestEndToEnd runs both converters into one temp dir and validates every
// emitted artifact through the real Lua loaders.
func TestEndToEnd(t *testing.T) {
	out := t.TempDir()

	// arch-binary: committed fixture -> packages/hello/package.lua.
	if err := binary.Convert(
		filepath.Join("..", "..", "testdata", "hello-1.0-1-x86_64.pkg.tar.zst"),
		registry.Options{Output: out, Repo: "https://example.org/repo"},
	); err != nil {
		t.Fatalf("binary.Convert: %v", err)
	}
	manifestPath := filepath.Join(out, "packages", "hello", "package.lua")
	if _, err := os.Stat(manifestPath); err != nil {
		t.Fatalf("expected manifest at %s: %v", manifestPath, err)
	}
	if stdout, err := runLua(t, manifestProbe(manifestPath)); err != nil {
		t.Fatalf("manifest probe failed: %v\nlua output: %s", err, stdout)
	}

	// arch-src: committed fixture -> <out>/mytool.recipe.
	if err := src.Convert(
		filepath.Join("..", "..", "testdata", "srcinfo", "mytool"),
		registry.Options{Output: out, Arch: "x86_64"},
	); err != nil {
		t.Fatalf("src.Convert: %v", err)
	}
	recipePath := filepath.Join(out, "mytool.recipe")
	if _, err := os.Stat(recipePath); err != nil {
		t.Fatalf("expected recipe at %s: %v", recipePath, err)
	}
	if stdout, err := runLua(t, recipeProbe(recipePath)); err != nil {
		t.Fatalf("recipe probe failed: %v\nlua output: %s", err, stdout)
	}
}

// TestEndToEndRejectsBrokenManifest proves the manifest probe is real, not a
// no-op: corrupting the emitted sha256 must make manifest.load (and thus the
// probe) fail. A probe that ignored the file would let this test fail.
func TestEndToEndRejectsBrokenManifest(t *testing.T) {
	out := t.TempDir()

	if err := binary.Convert(
		filepath.Join("..", "..", "testdata", "hello-1.0-1-x86_64.pkg.tar.zst"),
		registry.Options{Output: out, Repo: "https://example.org/repo"},
	); err != nil {
		t.Fatalf("binary.Convert: %v", err)
	}
	manifestPath := filepath.Join(out, "packages", "hello", "package.lua")
	content, err := os.ReadFile(manifestPath)
	if err != nil {
		t.Fatalf("read manifest: %v", err)
	}

	sha256Re := regexp.MustCompile(`[0-9a-fA-F]{64}`)
	broken := sha256Re.ReplaceAllString(string(content), "zzz")
	if broken == string(content) || !strings.Contains(broken, "zzz") {
		t.Fatal("could not corrupt the manifest: no 64-hex sha256 found")
	}
	brokenPath := filepath.Join(out, "broken-package.lua")
	if err := os.WriteFile(brokenPath, []byte(broken), 0o644); err != nil {
		t.Fatalf("write broken manifest: %v", err)
	}

	stdout, err := runLua(t, manifestProbe(brokenPath))
	if err == nil {
		t.Fatalf("probe unexpectedly accepted broken manifest\nlua output: %s", stdout)
	}
}