package hub

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

// Install clones a GitHub repo (owner/repo or full URL) and installs the team.
func Install(repoRef, agentsDir, skillsDir string) error {
	url := repoRef
	if !strings.HasPrefix(repoRef, "http") {
		url = "https://github.com/" + repoRef
	}

	tmp, err := os.MkdirTemp("", "agent-team-hub-*")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tmp)

	cmd := exec.Command("git", "clone", "--depth=1", url, tmp)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		return fmt.Errorf("git clone: %w", err)
	}

	// Copy agents/
	if err := copyDir(filepath.Join(tmp, "agents"), agentsDir); err != nil {
		return fmt.Errorf("install agents: %w", err)
	}
	// Copy skills/
	if err := copyDir(filepath.Join(tmp, "skills"), skillsDir); err != nil {
		return fmt.Errorf("install skills: %w", err)
	}
	return nil
}

func copyDir(src, dst string) error {
	if _, err := os.Stat(src); os.IsNotExist(err) {
		return nil // optional dir, skip
	}
	os.MkdirAll(dst, 0755)
	entries, err := os.ReadDir(src)
	if err != nil {
		return err
	}
	for _, e := range entries {
		srcPath := filepath.Join(src, e.Name())
		dstPath := filepath.Join(dst, e.Name())
		if e.IsDir() {
			if err := copyDir(srcPath, dstPath); err != nil {
				return err
			}
		} else {
			data, err := os.ReadFile(srcPath)
			if err != nil {
				return err
			}
			os.MkdirAll(filepath.Dir(dstPath), 0755)
			if err := os.WriteFile(dstPath, data, 0644); err != nil {
				return err
			}
		}
	}
	return nil
}