package majordomo

import (
	"net/http"

	"gitea.stevedudenhoeffer.com/steve/majordomo/llm"
	"gitea.stevedudenhoeffer.com/steve/majordomo/provider/anthropic"
	"gitea.stevedudenhoeffer.com/steve/majordomo/provider/google"
	"gitea.stevedudenhoeffer.com/steve/majordomo/provider/llamaswap"
	"gitea.stevedudenhoeffer.com/steve/majordomo/provider/ollama"
	"gitea.stevedudenhoeffer.com/steve/majordomo/provider/openai"
)

// Built-in provider names.
const (
	ProviderOpenAI      = "openai"
	ProviderAnthropic   = "anthropic"
	ProviderGoogle      = "google"
	ProviderOllama      = "ollama"
	ProviderOllamaCloud = "ollama-cloud"
	ProviderForeman     = "foreman"
	ProviderLlamaSwap   = "llama-swap"
	// ProviderLlamaSwapTLS is the DSN scheme for a TLS-fronted llama-swap
	// (https base URL). It is a scheme only, not a default built-in provider
	// name. Why a separate scheme rather than auto-detecting: a DSN carries no
	// reliable signal for http vs https, so the choice is explicit
	// (llama-swap = http local-first, llama-swaps = https), mirroring rediss.
	ProviderLlamaSwapTLS = "llama-swaps"
)

// registerBuiltins installs the built-in providers and env-DSN scheme
// factories into a fresh registry. httpClient, when non-nil, is used by
// every provider and factory the registry itself constructs.
func registerBuiltins(r *Registry, httpClient *http.Client) {
	ollamaOpts := func(extra ...ollama.Option) []ollama.Option {
		if httpClient != nil {
			extra = append(extra, ollama.WithHTTPClient(httpClient))
		}
		return extra
	}

	// Native-Ollama family: three names over one client with presets.
	r.providers[ProviderOllama] = ollama.Local(ollamaOpts()...)
	r.providers[ProviderOllamaCloud] = ollama.Cloud(ollamaOpts()...)
	// foreman has no default URL; the no-DSN registration resolves but
	// errors on use with a clear message (use an LLM_* DSN or
	// ollama.Foreman(...) + RegisterProvider).
	r.providers[ProviderForeman] = ollama.New(ollamaOpts(ollama.WithName(ProviderForeman))...)

	ollamaScheme := func(name string, dsn DSN) (llm.Provider, error) {
		return ollama.New(ollamaOpts(
			ollama.WithName(name),
			ollama.WithBaseURL(dsn.BaseURL()),
			ollama.WithToken(dsn.Token),
		)...), nil
	}
	r.schemes[ProviderOllama] = ollamaScheme
	r.schemes[ProviderOllamaCloud] = ollamaScheme
	r.schemes[ProviderForeman] = ollamaScheme

	// OpenAI and OpenAI-compatible endpoints.
	openaiOpts := func(extra ...openai.Option) []openai.Option {
		if httpClient != nil {
			extra = append(extra, openai.WithHTTPClient(httpClient))
		}
		return extra
	}
	r.providers[ProviderOpenAI] = openai.New(openaiOpts()...)
	r.schemes[ProviderOpenAI] = func(name string, dsn DSN) (llm.Provider, error) {
		return openai.New(openaiOpts(
			openai.WithName(name),
			openai.WithBaseURL(dsn.BaseURL()),
			openai.WithAPIKey(dsn.Token),
		)...), nil
	}

	// llama-swap: OpenAI-compatible chat + image generation + management
	// endpoints over a model-swapping proxy. Chat reuses the openai client
	// (provider/llamaswap delegates). Two schemes: "llama-swap" builds an
	// http:// base URL (local-first default), "llama-swaps" builds https://
	// for a TLS-fronted instance (mirrors redis/rediss). The no-DSN built-in
	// errors on use with a clear message, mirroring foreman.
	llamaSwapOpts := func(extra ...llamaswap.Option) []llamaswap.Option {
		if httpClient != nil {
			extra = append(extra, llamaswap.WithHTTPClient(httpClient))
		}
		return extra
	}
	llamaSwapScheme := func(urlScheme string) SchemeFactory {
		return func(name string, dsn DSN) (llm.Provider, error) {
			return llamaswap.New(llamaSwapOpts(
				llamaswap.WithName(name),
				llamaswap.WithBaseURL(urlScheme+"://"+dsn.Host),
				llamaswap.WithToken(dsn.Token),
			)...), nil
		}
	}
	r.providers[ProviderLlamaSwap] = llamaswap.New(llamaSwapOpts(llamaswap.WithName(ProviderLlamaSwap))...)
	r.schemes[ProviderLlamaSwap] = llamaSwapScheme("http")
	r.schemes[ProviderLlamaSwapTLS] = llamaSwapScheme("https")

	// Anthropic and Anthropic-compatible endpoints.
	anthropicOpts := func(extra ...anthropic.Option) []anthropic.Option {
		if httpClient != nil {
			extra = append(extra, anthropic.WithHTTPClient(httpClient))
		}
		return extra
	}
	r.providers[ProviderAnthropic] = anthropic.New(anthropicOpts()...)
	r.schemes[ProviderAnthropic] = func(name string, dsn DSN) (llm.Provider, error) {
		return anthropic.New(anthropicOpts(
			anthropic.WithName(name),
			anthropic.WithBaseURL(dsn.BaseURL()),
			anthropic.WithAPIKey(dsn.Token),
		)...), nil
	}

	// Google (Gemini) on the official SDK; "gemini" is an alternate scheme.
	googleOpts := func(extra ...google.Option) []google.Option {
		if httpClient != nil {
			extra = append(extra, google.WithHTTPClient(httpClient))
		}
		return extra
	}
	r.providers[ProviderGoogle] = google.New(googleOpts()...)
	googleScheme := func(name string, dsn DSN) (llm.Provider, error) {
		return google.New(googleOpts(
			google.WithName(name),
			google.WithBaseURL(dsn.BaseURL()),
			google.WithAPIKey(dsn.Token),
		)...), nil
	}
	r.schemes[ProviderGoogle] = googleScheme
	r.schemes["gemini"] = googleScheme
}