package providers

import (
	"fmt"
	"sync"
)

// registry holds all registered providers.
var (
	registry = make(map[string]Provider)
	mu       sync.RWMutex
)

// Register adds a provider to the registry.
func Register(p Provider) {
	mu.Lock()
	defer mu.Unlock()
	registry[p.ID()] = p
}

// Get returns a provider by ID.
func Get(id string) (Provider, error) {
	mu.RLock()
	defer mu.RUnlock()
	p, ok := registry[id]
	if !ok {
		return nil, fmt.Errorf("unknown provider: %s", id)
	}
	return p, nil
}

// List returns all registered provider IDs.
func List() []string {
	mu.RLock()
	defer mu.RUnlock()
	ids := make([]string, 0, len(registry))
	for id := range registry {
		ids = append(ids, id)
	}
	return ids
}

// Init registers all built-in providers.
func Init() {
	Register(&OpenAIProvider{})
	Register(&AnthropicProvider{})
	Register(&VeniceProvider{})
	Register(&OpenRouterProvider{})
}