package providers

import "strings"

// ModelRef represents a parsed model reference with provider and model name.
type ModelRef struct {
	Provider string
	Model    string
}

// ParseModelRef parses "anthropic/claude-opus" into {Provider: "anthropic", Model: "claude-opus"}.
// If no slash present, uses defaultProvider.
// Returns nil for empty input.
func ParseModelRef(raw string, defaultProvider string) *ModelRef {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil
	}

	provider, model := SplitModelProviderAndID(raw, defaultProvider)
	if model == "" {
		return nil
	}
	return &ModelRef{
		Provider: provider,
		Model:    model,
	}
}

// NormalizeProvider normalizes provider identifiers to canonical form.
func NormalizeProvider(provider string) string {
	normalized := strings.ToLower(strings.TrimSpace(provider))
	if normalized == "" {
		return ""
	}
	if canonical, ok := normalizedModelProviderAliasesByName[normalized]; ok {
		return canonical
	}
	return normalized
}

// ModelKey returns a canonical "provider/model" key for deduplication.
func ModelKey(provider, model string) string {
	return NormalizeProvider(provider) + "/" + strings.ToLower(strings.TrimSpace(model))
}