/**
 * Background bash process output and kill tools.
 * Mirrors `tools/bash_tools.rs`.
 */
import * as fs from "node:fs";
import * as path from "node:path";
import type { JsonValue } from "@zesdex/domain";
import { type Tool, type ToolCtx } from "./mod.ts";
import { argStr } from "./util.ts";
import { bashControl } from "./bgbash/control.ts";

/** Get the output of a background bash job by ID. */
export class BashOutput implements Tool {
  name = "bash_output";
  description = "Get the output of a background bash job by ID";

  parameters = {
    type: "object",
    properties: {
      job_id: { type: "string", description: "Background job ID" },
    },
    required: ["job_id"],
  };

  run(ctx: ToolCtx, args: JsonValue): string {
    const jobId = argStr(args, "job_id");

    // Prevent path traversal
    if (jobId.includes("/") || jobId.includes("\\") || jobId.includes("..")) {
      throw new Error(`invalid job_id '${jobId}': must not contain path separators`);
    }

    const outputDir = path.join(ctx.sessionDir, "bash-outputs");
    const outputFile = path.join(outputDir, jobId);

    if (fs.existsSync(outputFile)) {
      try {
        const content = fs.readFileSync(outputFile, "utf8");
        return `Output for job '${jobId}':\n${content}`;
      } catch (e) {
        return `Error reading output: ${(e as Error).message}`;
      }
    }
    return `No output found for job '${jobId}'. The job may still be running.`;
  }
}

/** Kill a background bash job by ID. */
export class BashKill implements Tool {
  name = "bash_kill";
  description = "Kill a background bash job by ID";

  parameters = {
    type: "object",
    properties: {
      job_id: { type: "string", description: "Background job ID to kill" },
    },
    required: ["job_id"],
  };

  run(_ctx: ToolCtx, args: JsonValue): string {
    const jobId = argStr(args, "job_id");
    // Look up the job in the global bgbash registry.
    const cancelled = bashControl().cancel(jobId);
    if (!cancelled) {
      throw new Error(`no active background job found with ID '${jobId}'`);
    }
    return `Background job '${jobId}' killed.`;
  }
}