/**
 * Temporary compatibility entrypoint preserving the old global pi-ai API
 * surface: api-dispatch `stream()`/`complete()` with env API key injection,
 * the api-registry, generated catalog reads (`getModel`/`getModels`/
 * `getProviders`), per-API lazy stream wrappers, and image generation.
 *
 * Existing apps switch imports from "@earendil-works/pi-ai" to
 * "@earendil-works/pi-ai/compat" unchanged; new code uses `createModels()`
 * and the provider factories. This module is deleted with the coding-agent
 * ModelManager migration.
 */

export * from "./api/anthropic-messages.lazy.ts";
export * from "./api/azure-openai-responses.lazy.ts";
export * from "./api/bedrock-converse-stream.lazy.ts";
export * from "./api/google-generative-ai.lazy.ts";
export * from "./api/google-vertex.lazy.ts";
export * from "./api/mistral-conversations.lazy.ts";
export * from "./api/openai-codex-responses.lazy.ts";
export * from "./api/openai-completions.lazy.ts";
export * from "./api/openai-responses.lazy.ts";
export * from "./api-registry.ts";
export * from "./env-api-keys.ts";
export * from "./image-models.ts";
export * from "./images.ts";
export * from "./images-api-registry.ts";
export * from "./index.ts";
export * from "./providers/images/register-builtins.ts";

import { anthropicMessagesApi } from "./api/anthropic-messages.lazy.ts";
import { azureOpenAIResponsesApi } from "./api/azure-openai-responses.lazy.ts";
import { bedrockConverseStreamApi } from "./api/bedrock-converse-stream.lazy.ts";
import { googleGenerativeAIApi } from "./api/google-generative-ai.lazy.ts";
import { googleVertexApi } from "./api/google-vertex.lazy.ts";
import { mistralConversationsApi } from "./api/mistral-conversations.lazy.ts";
import { openAICodexResponsesApi } from "./api/openai-codex-responses.lazy.ts";
import { openAICompletionsApi } from "./api/openai-completions.lazy.ts";
import { openAIResponsesApi } from "./api/openai-responses.lazy.ts";
import { clearApiProviders, getApiProvider, registerApiProvider } from "./api-registry.ts";
import { getEnvApiKey } from "./env-api-keys.ts";
import { getBuiltinModel, getBuiltinModels, getBuiltinProviders } from "./providers/all.ts";
import type {
	Api,
	AssistantMessage,
	AssistantMessageEventStream,
	Context,
	Model,
	ProviderStreamOptions,
	ProviderStreams,
	SimpleStreamOptions,
	StreamOptions,
} from "./types.ts";

/** @deprecated Static catalog read. Use `getBuiltinModel` from "@earendil-works/pi-ai/providers/all" or `Models.getModel()`. */
export const getModel = getBuiltinModel;

/** @deprecated Static catalog read. Use `getBuiltinModels` from "@earendil-works/pi-ai/providers/all" or `Models.getModels()`. */
export const getModels = getBuiltinModels;

/** @deprecated Static catalog read. Use `getBuiltinProviders` from "@earendil-works/pi-ai/providers/all" or `Models.getProviders()`. */
export const getProviders = getBuiltinProviders;

const BUILTIN_APIS: [Api, ProviderStreams][] = [
	["anthropic-messages", anthropicMessagesApi()],
	["openai-completions", openAICompletionsApi()],
	["openai-responses", openAIResponsesApi()],
	["openai-codex-responses", openAICodexResponsesApi()],
	["azure-openai-responses", azureOpenAIResponsesApi()],
	["google-generative-ai", googleGenerativeAIApi()],
	["google-vertex", googleVertexApi()],
	["mistral-conversations", mistralConversationsApi()],
	["bedrock-converse-stream", bedrockConverseStreamApi()],
];

/**
 * Registers the builtin API implementations into the api-registry without
 * clobbering existing entries: compat may load after a test or extension has
 * already registered an override for a builtin api id.
 */
export function registerBuiltInApiProviders(): void {
	for (const [api, streams] of BUILTIN_APIS) {
		if (getApiProvider(api)) continue;
		registerApiProvider({ api, stream: streams.stream, streamSimple: streams.streamSimple });
	}
}

export function resetApiProviders(): void {
	clearApiProviders();
	registerBuiltInApiProviders();
}

registerBuiltInApiProviders();

function hasExplicitApiKey(apiKey: string | undefined): apiKey is string {
	return typeof apiKey === "string" && apiKey.trim().length > 0;
}

function withEnvApiKey<TOptions extends StreamOptions>(
	model: Model<Api>,
	options: TOptions | undefined,
): TOptions | undefined {
	if (hasExplicitApiKey(options?.apiKey)) return options;
	const apiKey = getEnvApiKey(model.provider);
	if (!apiKey) return options;
	return { ...options, apiKey } as TOptions;
}

function resolveApiProvider(api: Api) {
	const provider = getApiProvider(api);
	if (!provider) {
		throw new Error(`No API provider registered for api: ${api}`);
	}
	return provider;
}

export function stream<TApi extends Api>(
	model: Model<TApi>,
	context: Context,
	options?: ProviderStreamOptions,
): AssistantMessageEventStream {
	const provider = resolveApiProvider(model.api);
	return provider.stream(model, context, withEnvApiKey(model, options) as StreamOptions);
}

export async function complete<TApi extends Api>(
	model: Model<TApi>,
	context: Context,
	options?: ProviderStreamOptions,
): Promise<AssistantMessage> {
	const s = stream(model, context, options);
	return s.result();
}

export function streamSimple<TApi extends Api>(
	model: Model<TApi>,
	context: Context,
	options?: SimpleStreamOptions,
): AssistantMessageEventStream {
	const provider = resolveApiProvider(model.api);
	return provider.streamSimple(model, context, withEnvApiKey(model, options));
}

export async function completeSimple<TApi extends Api>(
	model: Model<TApi>,
	context: Context,
	options?: SimpleStreamOptions,
): Promise<AssistantMessage> {
	const s = streamSimple(model, context, options);
	return s.result();
}