/**
 * @copyright NHCarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */

import {
  AttachmentBuilder,
  MessageFlags,
  type ChatInputCommandInteraction,
} from "discord.js";
import { ids } from "../config/ids.js";
import { anthropic } from "../utils/anthropic.js";
import { logger } from "../utils/logger.js";
import { amariPersonality } from "../utils/makeAiRequest.js";
import type { Amari } from "../interfaces/amari.js";
import type { ContentBlock } from "@anthropic-ai/sdk/resources/messages.js";

const researchSystemPrompt = `${amariPersonality}\n\nYour role in this`
  + " conversation is to research the user's query thoroughly using web search."
  + " Provide a comprehensive, well-structured response with cited sources."
  + " Format your response clearly with headers and sections where"
  + " appropriate.";

/**
 * Formats a single content block into a markdown string.
 * @param block - The content block to format.
 * @returns A formatted markdown string.
 */
const formatBlock = (block: ContentBlock): string => {
  if (block.type === "text") {
    if ((block.citations?.length ?? 0) > 0) {
      const sources = (block.citations ?? []).
        filter((citation) => {
          return citation.type === "web_search_result_location";
        }).
        map((citation) => {
          return `- [${citation.title ?? "Unknown Title"}](${citation.url})`;
        }).
        join("\n");
      return `${block.text}\n\n**Sources:**\n${sources}`;
    }
    return block.text;
  }
  if (block.type === "server_tool_use") {
    return `> 🔍 *Searching: ${JSON.stringify(block.input)}*`;
  }
  if (block.type === "web_search_tool_result") {
    if (!Array.isArray(block.content)) {
      return "";
    }
    const links = block.content.
      map((entry) => {
        return `[${entry.title}](${entry.url})`;
      }).
      join(", ");
    return `> 📄 *Found: ${links}*`;
  }
  if (block.type === "thinking") {
    return `> 💭 *${block.thinking}*`;
  }
  return "";
};

/**
 * Builds a markdown buffer from the research prompt and API response content.
 * @param prompt - The original research prompt.
 * @param content - The content blocks returned from the API.
 * @returns A Buffer containing the formatted markdown.
 */
const buildMarkdownFile = (
  prompt: string,
  content: Array<ContentBlock>,
): Buffer => {
  const markdown = [
    `# Research: ${prompt}`,
    "",
    ...content.
      map((block) => {
        return formatBlock(block);
      }).
      filter((block) => {
        return block.length > 0;
      }),
  ].join("\n\n");
  return Buffer.from(markdown, "utf-8");
};

/**
 * Runs a web-search-backed research query and returns the result as a
 * markdown file attachment.
 * @param _amari - The Amari instance (unused but kept for handler consistency).
 * @param interaction - The Discord slash command interaction.
 */
export const research = async(
  _amari: Amari,
  interaction: ChatInputCommandInteraction,
): Promise<void> => {
  if (interaction.user.id !== ids.users.naomi) {
    await interaction.reply({
      content: "This command is restricted to Naomi.",
      flags:   [ MessageFlags.Ephemeral ],
    });
    return;
  }

  const prompt = interaction.options.getString("prompt", true);

  await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });

  try {
    const response = await anthropic.messages.create({
      // eslint-disable-next-line @typescript-eslint/naming-convention -- Anthropic API field.
      max_tokens: 3000,
      messages:   [ { content: prompt, role: "user" } ],
      model:      "claude-sonnet-4-6",
      system:     researchSystemPrompt,
      tools:      [ {
        // eslint-disable-next-line @typescript-eslint/naming-convention -- Anthropic API field.
        max_uses: 5,
        name:     "web_search",
        type:     "web_search_20250305",
      } ],
    });

    const file = new AttachmentBuilder(
      buildMarkdownFile(prompt, response.content),
      { name: "research.md" },
    );

    await logger.metric("research_query", 1, { user: interaction.user.id });
    await interaction.editReply({
      content: "Here are your research results!",
      files:   [ file ],
    });
  } catch (error) {
    await logger.error("research command", error instanceof Error
      ? error
      : new Error(String(error)));
    await interaction.editReply({
      content: "Something went wrong whilst running the research query.",
    });
  }
};