package aiprovider

import "strings"

// Mode values stored on ai_providers.mode (UI / API).
const (
	ModeInternal = "internal"
	ModePopular  = "popular"
	ModeCustom   = "custom"
)

// ModeInternalLabel is the analytics / job recording value when using platform OpenAI (admin settings or env fallback).
const ModeInternalLabel = "internal"

// ModeCustomLabel is the analytics value for custom OpenAI-compatible endpoints.
const ModeCustomLabel = "custom"

// PopularProvider is a curated OpenAI-compatible catalog entry.
type PopularProvider struct {
	Name         string   `json:"name"`
	Label        string   `json:"label"`
	BaseURL      string   `json:"base_url"`
	DefaultModel string   `json:"default_model"`
	Models       []string `json:"models"`
}

// PopularCatalog lists OpenAI-compatible providers tenants can pick by API key only.
var PopularCatalog = []PopularProvider{
	{
		Name:         "openai",
		Label:        "OpenAI",
		BaseURL:      "https://api.openai.com/v1",
		DefaultModel: "gpt-4o-mini",
		Models:       []string{"gpt-4o-mini", "gpt-4o", "gpt-4.1-mini", "gpt-4.1"},
	},
	{
		Name:         "google",
		Label:        "Google (Gemini OpenAI compat)",
		BaseURL:      "https://generativelanguage.googleapis.com/v1beta/openai",
		DefaultModel: "gemini-2.0-flash",
		Models:       []string{"gemini-2.0-flash", "gemini-2.5-flash", "gemini-2.0-flash-lite"},
	},
	{
		Name:         "groq",
		Label:        "Groq",
		BaseURL:      "https://api.groq.com/openai/v1",
		DefaultModel: "llama-3.3-70b-versatile",
		Models:       []string{"llama-3.3-70b-versatile", "llama-3.1-8b-instant", "mixtral-8x7b-32768"},
	},
	{
		Name:         "mistral",
		Label:        "Mistral",
		BaseURL:      "https://api.mistral.ai/v1",
		DefaultModel: "mistral-small-latest",
		Models:       []string{"mistral-small-latest", "mistral-medium-latest", "mistral-large-latest"},
	},
	{
		Name:         "deepseek",
		Label:        "DeepSeek",
		BaseURL:      "https://api.deepseek.com/v1",
		DefaultModel: "deepseek-chat",
		Models:       []string{"deepseek-chat", "deepseek-reasoner"},
	},
	{
		Name:         "openrouter",
		Label:        "OpenRouter",
		BaseURL:      "https://openrouter.ai/api/v1",
		DefaultModel: "openai/gpt-4o-mini",
		Models:       []string{"openai/gpt-4o-mini", "anthropic/claude-sonnet-4", "google/gemini-2.0-flash-001"},
	},
}

func FindPopular(name string) (PopularProvider, bool) {
	name = strings.ToLower(strings.TrimSpace(name))
	for _, p := range PopularCatalog {
		if p.Name == name {
			return p, true
		}
	}
	return PopularProvider{}, false
}

// AnalyticsMode returns the recorded provider mode for jobs/products.
// Contract for analytics: "internal" | "popular:<name>" | "custom"
func AnalyticsMode(mode, popularName string) string {
	switch strings.ToLower(strings.TrimSpace(mode)) {
	case ModePopular:
		name := strings.ToLower(strings.TrimSpace(popularName))
		if name == "" {
			name = "unknown"
		}
		return "popular:" + name
	case ModeCustom:
		return ModeCustomLabel
	default:
		return ModeInternalLabel
	}
}

// AnalyticsClass maps a stored ai_provider_mode value to a rollup class.
// Returns: internal | popular | custom | unknown
func AnalyticsClass(modeLabel string) string {
	m := strings.ToLower(strings.TrimSpace(modeLabel))
	switch {
	case m == "" || m == "unknown":
		return "unknown"
	case m == ModeInternalLabel || m == ModeInternal:
		return ModeInternal
	case m == ModeCustomLabel || m == ModeCustom:
		return ModeCustom
	case strings.HasPrefix(m, "popular:"):
		return ModePopular
	default:
		return "unknown"
	}
}

// NormalizeAnalyticsMode coerces free-form labels into the analytics contract.
func NormalizeAnalyticsMode(modeLabel string) string {
	m := strings.ToLower(strings.TrimSpace(modeLabel))
	switch {
	case m == "" || m == "unknown":
		return "unknown"
	case m == ModeInternalLabel || m == ModeInternal:
		return ModeInternalLabel
	case m == ModeCustomLabel || m == ModeCustom:
		return ModeCustomLabel
	case strings.HasPrefix(m, "popular:"):
		name := strings.TrimSpace(strings.TrimPrefix(m, "popular:"))
		if name == "" {
			name = "unknown"
		}
		return "popular:" + name
	default:
		return "unknown"
	}
}

func normalizeMode(mode string) string {
	switch strings.ToLower(strings.TrimSpace(mode)) {
	case ModePopular:
		return ModePopular
	case ModeCustom:
		return ModeCustom
	default:
		return ModeInternal
	}
}