/* eslint-disable n8n-nodes-base/node-dirname-against-convention */

import { ChatAnthropic } from '@langchain/anthropic';
import type { LLMResult } from '@langchain/core/outputs';
import {
	NodeConnectionType,
	type INodePropertyOptions,
	type INodeProperties,
	type ISupplyDataFunctions,
	type INodeType,
	type INodeTypeDescription,
	type SupplyData,
} from 'n8n-workflow';

import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
import { N8nLlmTracing } from '../N8nLlmTracing';
import { makeN8nLlmFailedAttemptHandler } from '../n8nLlmFailedAttemptHandler';

const modelField: INodeProperties = {
	displayName: 'Model',
	name: 'model',
	type: 'options',
	// eslint-disable-next-line n8n-nodes-base/node-param-options-type-unsorted-items
	options: [
		{
			name: 'Claude 3.5 Sonnet(20241022)',
			value: 'claude-3-5-sonnet-20241022',
		},
		{
			name: 'Claude 3 Opus(20240229)',
			value: 'claude-3-opus-20240229',
		},
		{
			name: 'Claude 3.5 Sonnet(20240620)',
			value: 'claude-3-5-sonnet-20240620',
		},
		{
			name: 'Claude 3 Sonnet(20240229)',
			value: 'claude-3-sonnet-20240229',
		},
		{
			name: 'Claude 3.5 Haiku(20241022)',
			value: 'claude-3-5-haiku-20241022',
		},
		{
			name: 'Claude 3 Haiku(20240307)',
			value: 'claude-3-haiku-20240307',
		},
		{
			name: 'LEGACY: Claude 2',
			value: 'claude-2',
		},
		{
			name: 'LEGACY: Claude 2.1',
			value: 'claude-2.1',
		},
		{
			name: 'LEGACY: Claude Instant 1.2',
			value: 'claude-instant-1.2',
		},
		{
			name: 'LEGACY: Claude Instant 1',
			value: 'claude-instant-1',
		},
	],
	description:
		'The model which will generate the completion. <a href="https://docs.anthropic.com/claude/docs/models-overview">Learn more</a>.',
	default: 'claude-2',
};

export class LmChatAnthropic implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Anthropic Chat Model',
		// eslint-disable-next-line n8n-nodes-base/node-class-description-name-miscased
		name: 'lmChatAnthropic',
		icon: 'file:anthropic.svg',
		group: ['transform'],
		version: [1, 1.1, 1.2],
		defaultVersion: 1.2,
		description: 'Language Model Anthropic',
		defaults: {
			name: 'Anthropic Chat Model',
		},
		codex: {
			categories: ['AI'],
			subcategories: {
				AI: ['Language Models', 'Root Nodes'],
				'Language Models': ['Chat Models (Recommended)'],
			},
			resources: {
				primaryDocumentation: [
					{
						url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.lmchatanthropic/',
					},
				],
			},
			alias: ['claude', 'sonnet', 'opus'],
		},
		// eslint-disable-next-line n8n-nodes-base/node-class-description-inputs-wrong-regular-node
		inputs: [],
		// eslint-disable-next-line n8n-nodes-base/node-class-description-outputs-wrong
		outputs: [NodeConnectionType.AiLanguageModel],
		outputNames: ['Model'],
		credentials: [
			{
				name: 'anthropicApi',
				required: true,
			},
		],
		properties: [
			getConnectionHintNoticeField([NodeConnectionType.AiChain, NodeConnectionType.AiChain]),
			{
				...modelField,
				displayOptions: {
					show: {
						'@version': [1],
					},
				},
			},
			{
				...modelField,
				default: 'claude-3-sonnet-20240229',
				displayOptions: {
					show: {
						'@version': [1.1],
					},
				},
			},
			{
				...modelField,
				default: 'claude-3-5-sonnet-20240620',
				options: (modelField.options ?? []).filter(
					(o): o is INodePropertyOptions => 'name' in o && !o.name.toString().startsWith('LEGACY'),
				),
				displayOptions: {
					show: {
						'@version': [{ _cnd: { gte: 1.2 } }],
					},
				},
			},
			{
				displayName: 'Options',
				name: 'options',
				placeholder: 'Add Option',
				description: 'Additional options to add',
				type: 'collection',
				default: {},
				options: [
					{
						displayName: 'Maximum Number of Tokens',
						name: 'maxTokensToSample',
						default: 4096,
						description: 'The maximum number of tokens to generate in the completion',
						type: 'number',
					},
					{
						displayName: 'Sampling Temperature',
						name: 'temperature',
						default: 0.7,
						typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
						description:
							'Controls randomness: Lowering results in less random completions. As the temperature approaches zero, the model will become deterministic and repetitive.',
						type: 'number',
					},
					{
						displayName: 'Top K',
						name: 'topK',
						default: -1,
						typeOptions: { maxValue: 1, minValue: -1, numberPrecision: 1 },
						description:
							'Used to remove "long tail" low probability responses. Defaults to -1, which disables it.',
						type: 'number',
					},
					{
						displayName: 'Top P',
						name: 'topP',
						default: 1,
						typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
						description:
							'Controls diversity via nucleus sampling: 0.5 means half of all likelihood-weighted options are considered. We generally recommend altering this or temperature but not both.',
						type: 'number',
					},
				],
			},
		],
	};

	async supplyData(this: ISupplyDataFunctions, itemIndex: number): Promise<SupplyData> {
		const credentials = await this.getCredentials('anthropicApi');

		const modelName = this.getNodeParameter('model', itemIndex) as string;
		const options = this.getNodeParameter('options', itemIndex, {}) as {
			maxTokensToSample?: number;
			temperature: number;
			topK: number;
			topP: number;
		};

		const tokensUsageParser = (llmOutput: LLMResult['llmOutput']) => {
			const usage = (llmOutput?.usage as { input_tokens: number; output_tokens: number }) ?? {
				input_tokens: 0,
				output_tokens: 0,
			};
			return {
				completionTokens: usage.output_tokens,
				promptTokens: usage.input_tokens,
				totalTokens: usage.input_tokens + usage.output_tokens,
			};
		};
		const model = new ChatAnthropic({
			anthropicApiKey: credentials.apiKey as string,
			modelName,
			maxTokens: options.maxTokensToSample,
			temperature: options.temperature,
			topK: options.topK,
			topP: options.topP,
			callbacks: [new N8nLlmTracing(this, { tokensUsageParser })],
			onFailedAttempt: makeN8nLlmFailedAttemptHandler(this),
		});

		return {
			response: model,
		};
	}
}