// Package projects provides a registry of claudebox projects.
package projects

import (
	"context"
	"fmt"
	"os/exec"
	"strings"
	"sync"
)

// Project represents a claudebox project.
type Project struct {
	ID          string `json:"id"`
	Name        string `json:"name"`
	Description string `json:"description"`
	PodName     string `json:"pod"`
	Status      string `json:"status"`
	Workspace   string `json:"workspace,omitempty"`
}

// Registry manages the list of available projects.
type Registry struct {
	namespace string
	projects  map[string]*Project
	mu        sync.RWMutex
}

// NewRegistry creates a new project registry.
func NewRegistry(namespace string) *Registry {
	r := &Registry{
		namespace: namespace,
		projects:  make(map[string]*Project),
	}

	// Initialize with known projects
	// In the future, this could discover projects from K8s labels
	r.projects["pantheon"] = &Project{
		ID:          "pantheon",
		Name:        "Pantheon",
		Description: "Go API backend",
		PodName:     "claudebox-pantheon-0",
		Status:      "unknown",
		Workspace:   "/workspace",
	}
	r.projects["aeries"] = &Project{
		ID:          "aeries",
		Name:        "Aeries",
		Description: "Note community platform",
		PodName:     "claudebox-aeries-0",
		Status:      "unknown",
		Workspace:   "/workspace",
	}

	return r
}

// List returns all projects.
func (r *Registry) List() []*Project {
	r.mu.RLock()
	defer r.mu.RUnlock()

	projects := make([]*Project, 0, len(r.projects))
	for _, p := range r.projects {
		projects = append(projects, p)
	}
	return projects
}

// Get returns a project by ID.
func (r *Registry) Get(id string) (*Project, bool) {
	r.mu.RLock()
	defer r.mu.RUnlock()

	p, ok := r.projects[id]
	return p, ok
}

// Exists checks if a project exists.
func (r *Registry) Exists(id string) bool {
	r.mu.RLock()
	defer r.mu.RUnlock()

	_, ok := r.projects[id]
	return ok
}

// RefreshStatus updates the status of all projects from K8s.
func (r *Registry) RefreshStatus(ctx context.Context) error {
	r.mu.Lock()
	defer r.mu.Unlock()

	for _, p := range r.projects {
		status, err := getPodStatus(ctx, r.namespace, p.PodName)
		if err != nil {
			p.Status = "error"
			continue
		}
		p.Status = status
	}
	return nil
}

// getPodStatus queries the status of a pod.
func getPodStatus(ctx context.Context, namespace, podName string) (string, error) {
	cmd := exec.CommandContext(ctx, "kubectl",
		"get", "pod", podName,
		"-n", namespace,
		"-o", "jsonpath={.status.phase}",
	)

	output, err := cmd.Output()
	if err != nil {
		// Check if pod doesn't exist
		if strings.Contains(err.Error(), "not found") {
			return "not_found", nil
		}
		return "unknown", fmt.Errorf("get pod status: %w", err)
	}

	phase := strings.ToLower(strings.TrimSpace(string(output)))
	switch phase {
	case "running":
		return "running", nil
	case "pending":
		return "pending", nil
	case "succeeded":
		return "completed", nil
	case "failed":
		return "failed", nil
	default:
		return phase, nil
	}
}

// Register adds a new project to the registry.
func (r *Registry) Register(p *Project) {
	r.mu.Lock()
	defer r.mu.Unlock()
	r.projects[p.ID] = p
}

// Unregister removes a project from the registry.
func (r *Registry) Unregister(id string) {
	r.mu.Lock()
	defer r.mu.Unlock()
	delete(r.projects, id)
}