import { Type } from "@sinclair/typebox";
import type { ExtensionAPI, ToolResult } from "../_shared/pi-api.js";
import { errorResult, textResult } from "../_shared/pi-api.js";
import { validateParams } from "../_shared/validation.js";

const DebugParams = Type.Object({
  action: Type.Union([
    Type.Literal("launch"),
    Type.Literal("attach"),
    Type.Literal("set_breakpoint"),
    Type.Literal("continue"),
    Type.Literal("pause"),
    Type.Literal("terminate"),
    Type.Literal("sessions"),
  ], { description: "Debug action" }),
  program: Type.Optional(Type.String({ maxLength: 1000, description: "Program path for launch" })),
  file: Type.Optional(Type.String({ maxLength: 1000 })),
  line: Type.Optional(Type.Integer({ minimum: 1 })),
});

const DETAILS = {
  owner: "omp-debug-dap",
  ported: false,
  requestedSurface: "tools-debug.debug",
  redesignRequired: true,
} as const;

const REPORT = [
  "debug is disabled in tools-debug.",
  "The previous local Node subprocess wrapper did not provide real debugger control.",
  "Port or thin-wrap the OMP DAP debug tool before enabling launch, attach, breakpoints, stepping, pause, output, or terminate.",
].join(" ");

export default function debugTool(pi: ExtensionAPI): void {
  pi.registerTool({
    name: "debug",
    description: "Disabled debug shell until the OMP DAP debug tool is ported.",
    parameters: DebugParams,
    execute(_toolCallId, params) {
      const valid = validateParams(DebugParams, params);
      if (!valid.ok) return valid.result;
      if (valid.value.action === "sessions") return debugStatus();
      return debugBlocked(valid.value.action);
    },
  });
}

function debugStatus(): ToolResult {
  return textResult(REPORT, { ...DETAILS, requestedAction: "sessions" });
}

function debugBlocked(action: string): ToolResult {
  return errorResult(REPORT, { ...DETAILS, requestedAction: action });
}