import { type } from "arktype";
import type { ToolContext } from "./server.ts";
import { execute, tool } from "./shared.ts";

interface GiteaIssue {
  number: number; title: string; body?: string | null; state: string; html_url: string;
  user?: { login: string }; labels?: Array<{ name?: string }>; assignees?: Array<{ login: string }>;
  comments: number; created_at: string; updated_at: string; closed_at?: string | null;
  milestone?: { title: string } | null; pull_request?: { html_url?: string } | null;
}

export const IssueInfo = type({
  issue_number: type.number.describe("The issue number to fetch"),
});

export function IssueInfoTool(ctx: ToolContext) {
  return tool({
    name: "get_issue",
    description: "Retrieve Gitea issue information by issue number. Example: `get_issue({ issue_number: 1234 })`.",
    parameters: IssueInfo,
    execute: execute(async ({ issue_number }) => {
      const r = await ctx.gitea.request(
        "GET /repos/{owner}/{repo}/issues/{index}",
        { owner: ctx.repo.owner, repo: ctx.repo.name, index: issue_number }
      );
      const data = r.data as GiteaIssue;
      ctx.toolState.issueNumber = issue_number;
      const hints: string[] = [];
      if (data.comments > 0) hints.push("use get_issue_comments to retrieve all comments for this issue");
      return {
        number: data.number, url: data.html_url, title: data.title, body: data.body,
        state: data.state,
        labels: data.labels?.map((l) => l.name).filter((n): n is string => n !== undefined),
        assignees: data.assignees?.map((a) => a.login).filter((n): n is string => n !== undefined),
        user: data.user?.login, created_at: data.created_at, updated_at: data.updated_at,
        closed_at: data.closed_at, comments: data.comments, milestone: data.milestone?.title,
        pull_request: data.pull_request ? { html_url: data.pull_request.html_url } : null,
        hints,
      };
    }),
  });
}