//go:build windows

package pkgmanager

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

	"golang.org/x/sys/windows/registry"
)

func listWindowsPackages() ([]PackageInfo, error) {
	seen := make(map[string]PackageInfo)

	if err := enumerateRegistryUninstall(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall`, seen); err != nil {
		return nil, fmt.Errorf("enumerate current user uninstall failed: %w", err)
	}
	if err := enumerateRegistryUninstall(registry.LOCAL_MACHINE, `SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall`, seen); err != nil {
		// non-fatal; 32-bit view may not exist
		_ = err
	}
	if err := enumerateRegistryUninstall(registry.CURRENT_USER, `SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall`, seen); err != nil {
		_ = err
	}

	if _, err := exec.LookPath(resolveManagerPath("winget", interactiveProfile())); err == nil {
		if wingetPkgs, err := listWingetPackages(); err == nil {
			for _, p := range wingetPkgs {
				key := p.Name + "@" + p.Manager
				if _, ok := seen[key]; !ok {
					seen[key] = p
				}
			}
		}
	}

	packages := make([]PackageInfo, 0, len(seen))
	for _, p := range seen {
		packages = append(packages, p)
	}
	return packages, nil
}

func enumerateRegistryUninstall(root registry.Key, path string, seen map[string]PackageInfo) error {
	k, err := registry.OpenKey(root, path, registry.READ)
	if err != nil {
		return err
	}
	defer k.Close()

	subKeys, err := k.ReadSubKeyNames(0)
	if err != nil {
		return err
	}

	for _, name := range subKeys {
		sk, err := registry.OpenKey(k, name, registry.READ)
		if err != nil {
			continue
		}
		displayName, _, err := sk.GetStringValue("DisplayName")
		if err != nil || displayName == "" {
			sk.Close()
			continue
		}
		displayVersion, _, _ := sk.GetStringValue("DisplayVersion")
		version := strings.TrimSpace(displayVersion)
		if version == "" {
			version = "unknown"
		}

		key := displayName + "@windows"
		if _, ok := seen[key]; !ok {
			seen[key] = PackageInfo{
				Name:    displayName,
				Version: version,
				Manager: "windows",
			}
		}
		sk.Close()
	}
	return nil
}

func BootstrapManagers() error {
	var errs []string

	if !lookupWinget() {
		if err := installWingetViaAppInstaller(); err != nil {
			errs = append(errs, "winget: "+err.Error())
		}
	}

	if _, err := exec.LookPath("choco"); err != nil {
		if err := installChocolatey(); err != nil {
			errs = append(errs, "chocolatey: "+err.Error())
		}
	}

	if len(errs) > 0 {
		return fmt.Errorf("bootstrap failed: %s", strings.Join(errs, "; "))
	}
	return nil
}

func installChocolatey() error {
	// Official Chocolatey install script (requires admin; agent runs as LocalSystem).
	cmd := exec.Command("powershell", "-NoProfile", "-ExecutionPolicy", "Bypass", "-Command",
		"Set-ExecutionPolicy Bypass -Scope Process -Force; "+
			"[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; "+
			"iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))")
	if out, err := cmd.CombinedOutput(); err != nil {
		return fmt.Errorf("chocolatey install script failed: %w\nOutput: %s", err, string(out))
	}
	return nil
}

func lookupWinget() bool {
	if _, err := exec.LookPath(resolveManagerPath("winget", interactiveProfile())); err == nil {
		return true
	}
	appInstaller := `Microsoft.DesktopAppInstaller_8wekyb3d8bbwe`
	appxReg, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows\CurrentVersion\Appx\AppxAllUserStore`,
		registry.READ|registry.ENUMERATE_SUB_KEYS)
	if err == nil {
		defer appxReg.Close()
		if keys, err := appxReg.ReadSubKeyNames(0); err == nil {
			for _, keyName := range keys {
				if strings.Contains(keyName, "DesktopAppInstaller") {
					_ = appInstaller
					return true
				}
			}
		}
	}
	return false
}

func installWingetViaAppInstaller() error {
	// Microsoft App Installer download link (redirects to latest winget bundle)
	installerURL := "https://aka.ms/getwinget"
	appInstallerPath := filepath.Join(os.TempDir(), "DesktopAppInstaller.msixbundle")

	// Download App Installer bundle
	downloadCmd := exec.Command("powershell", "-NoProfile", "-NonInteractive", "-Command",
		"[Net.ServicePointManager]::SecurityProtocol=[Net.SecurityProtocolType]::Tls12; "+
			"Invoke-WebRequest -Uri '"+installerURL+"' -OutFile '"+appInstallerPath+"' -UseBasicParsing")
	if out, err := downloadCmd.CombinedOutput(); err != nil {
		return fmt.Errorf("download App Installer failed: %w\nOutput: %s", err, string(out))
	}

	// Install bundle (dependencies may need to be allowed; add-AppxPackage on msixbundle handles it)
	installCmd := exec.Command("powershell", "-NoProfile", "-NonInteractive", "-Command",
		"Add-AppxPackage -Path '"+appInstallerPath+"' -ForceUpdateFromAnyVersion")
	if out, err := installCmd.CombinedOutput(); err != nil {
		return fmt.Errorf("install App Installer failed: %w\nOutput: %s", err, string(out))
	}

	return nil
}