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

import { MessageFlags, type ChatInputCommandInteraction } from "discord.js";
import { ids } from "../config/ids.js";
import { logger } from "../utils/logger.js";
import { makeAiRequest } from "../utils/makeAiRequest.js";

interface LeantimeResponse {
  error?:  { message: string };
  result?: number;
}

const taskSystemPrompt = "Create well-structured task descriptions."
  + " Be concise and actionable."
  + " Return only the description text with no extra formatting or headers.";

/**
 * Generates an AI-augmented task description.
 * @param description - Optional additional context for the task.
 * @param title - The subject of the Leantime task.
 * @returns The generated task description text, or the original description as fallback.
 */
const generateTaskDescription = async(
  description: string,
  title: string,
): Promise<string> => {
  const result = await makeAiRequest({
    maxTokens:    500,
    systemPrompt: taskSystemPrompt,
    userMessage:  `Create a clear, concise task description for a personal productivity board.\n\nTask title: ${title}${description === ""
      ? ""
      : `\nAdditional context: ${description}`}`,
  });
  return result ?? description;
};

/**
 * Posts a task to the Leantime board via JSON-RPC.
 * @param description - Body copy for the Leantime task.
 * @param priority - The task priority level.
 * @param title - The headline for the Leantime task.
 * @returns The Leantime API response.
 */
const postLeantimeTask = async(
  description: string,
  priority: number,
  title: string,
): Promise<LeantimeResponse> => {
  const response = await fetch("https://board.nhcarrigan.com/api/jsonrpc", {
    body: JSON.stringify({
      id:      `amari-task-${Date.now().toString()}`,
      jsonrpc: "2.0",
      method:  "leantime.rpc.tickets.addTicket",
      params:  {
        values: {
          description: description,
          editorId:    "1",
          headline:    title,
          priority:    priority.toString(),
          projectId:   "1",
          type:        "task",
        },
      },
    }),
    headers: {
      // eslint-disable-next-line @typescript-eslint/naming-convention -- HTTP header name.
      "Content-Type": "application/json",
      // eslint-disable-next-line @typescript-eslint/naming-convention -- HTTP header name.
      "x-api-key":    process.env.LEANTIME_KEY ?? "",
    },
    method: "POST",
  });
  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Required to type Response.json() output.
  const data = await response.json() as LeantimeResponse;
  return data;
};

/**
 * Creates a Leantime task using AI-augmented description content.
 * @param interaction - The Discord slash command interaction.
 */
export const createTask = async(
  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 title = interaction.options.getString("title", true);
  const description = interaction.options.getString("description") ?? "";
  const priority = interaction.options.getInteger("priority") ?? 3;

  await interaction.deferReply({ ephemeral: true });

  try {
    const augmentedDesc = await generateTaskDescription(description, title);
    const data = await postLeantimeTask(augmentedDesc, priority, title);

    if (data.error !== undefined) {
      await interaction.editReply({
        content: `❌ Failed to create task: ${data.error.message}`,
      });
      return;
    }

    const taskId = data.result;
    const taskUrl = taskId === undefined
      ? "https://board.nhcarrigan.com"
      : `https://board.nhcarrigan.com/dashboard/home#/tickets/showTicket/${taskId.toString()}`;

    await logger.metric("created_task", 1, { title });
    await interaction.editReply({
      content: `✅ Task created: **${title}**\n${taskUrl}`,
    });
  } catch (error) {
    if (error instanceof Error) {
      await logger.error("createTask command", error);
    }
    await interaction.editReply({
      content: "❌ An unexpected error occurred while creating the task.",
    });
  }
};