package gui

import (
	"debug/buildinfo"
	"errors"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"plugin"
	"runtime/debug"

	"go.wit.com/log"
)

// CheckPluginCompatibility verifies that the plugin .so file was built
// with the same Go version and dependency versions as the host binary.
func CheckPluginCompatibility(pluginPath string) error {
	pluginInfo, err := buildinfo.ReadFile(pluginPath)
	if err != nil {
		return log.Errorf("failed to read plugin build info: %w", err)
	}

	mainInfo, ok := debug.ReadBuildInfo()
	if !ok {
		log.Info("CHECK FAILED: failed to read main binary build info", pluginPath)
		log.Info("CHECK FAILED: failed to read main binary build info", pluginPath)
		return errors.New("CHECK FAILED: failed to read main binary build info")
	}

	if pluginInfo.GoVersion != mainInfo.GoVersion {
		return log.Errorf("Go version mismatch: plugin=%s, host=%s",
			pluginInfo.GoVersion, mainInfo.GoVersion)
	}
	log.Info("CHECK OK: binary build info:", pluginPath)

	// Create a map of main binary dependencies for quick lookup
	hostDeps := make(map[string]string)
	for _, dep := range mainInfo.Deps {
		hostDeps[dep.Path] = dep.Version
	}

	log.Info("CHECK OK: binary build info:", hostDeps)

	// Compare plugin dependencies
	for _, dep := range pluginInfo.Deps {
		hostVer, ok := hostDeps[dep.Path]
		if !ok {
			return log.Errorf("dependency %s not found in host binary", dep.Path)
		}
		if dep.Version != hostVer {
			return log.Errorf("dependency version mismatch for %s: plugin=%s, host=%s",
				dep.Path, dep.Version, hostVer)
		}
		log.Printf("DEP HASH: version %s: plugin=%s, host=%s\n", dep.Path, dep.Version, hostVer)
	}

	return nil
}

// tests the plugin file will load
func testPluginOld() {
	_, err := plugin.Open(argGui.GuiTest)
	if err != nil {
		log.Log(PLUG, "plugin.Open() FAILED =", argGui.GuiTest, err)
		os.Exit(-1)
	}
	log.Log(PLUG, "plugin.Open() SUCCESS loading plugin =", argGui.GuiTest)
	os.Exit(0)
}

// loads the plugin, then exits with 0 or -1
func TestPluginAndExit() {
	log.Log(WARN, "TEST plugin START", argGui.GuiCheck)

	absPath, err := filepath.Abs(argGui.GuiCheck)
	if err != nil {
		log.Log(WARN, "TEST plugin FAILED", argGui.GuiCheck, absPath, err)
		os.Exit(-1)
	}

	log.Log(WARN, "TEST plugin START abs:", absPath, argGui.GuiCheck)
	plug, err := checkPlug(absPath)
	if plug == nil {
		log.Log(WARN, "TEST plugin failed (returned nil):", argGui.GuiCheck, absPath, err)
		os.Exit(-1)
	}
	if err == nil {
		log.Log(WARN, "TEST plugin probably worked", argGui.GuiCheck, absPath)
		os.Exit(0)
	}
	log.Log(WARN, "TEST plugin failed", argGui.GuiCheck, absPath, err)
	os.Exit(-1)
}

func CheckPluginViaSubprocess(path string) error {
	exe, err := os.Executable()
	if err != nil {
		return fmt.Errorf("failed to get executable path: %w", err)
	}
	resolved, err := filepath.EvalSymlinks(exe)
	if err != nil {
		return fmt.Errorf("failed to resolve executable symlink: %w", err)
	}

	cmd := exec.Command(resolved, "--gui-check-plugin", path)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	return cmd.Run()
}

func checkPlug(pluginPath string) (*plugin.Plugin, error) {
	// const pluginPath = "/tmp/gocui.so"
	// ../../../toolkits/gocui/gocui.so
	// /usr/lib/go-gui-toolkits/gocui.v0.22.46.so

	if err := CheckPluginCompatibility(pluginPath); err != nil {
		log.Printf("Plugin check failed: %v\n", err)
		return nil, err
	}

	p, err := plugin.Open(pluginPath)
	if err != nil {
		log.Printf("plugin.Open failed: %v\n", err)
		return nil, err
	}

	log.Println("Plugin loaded successfully.")
	return p, nil
}