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

const LspParams = Type.Object({
  action: Type.Union([
    Type.Literal("diagnostics"),
    Type.Literal("definition"),
    Type.Literal("references"),
    Type.Literal("hover"),
    Type.Literal("symbols"),
    Type.Literal("implementation"),
    Type.Literal("type_definition"),
    Type.Literal("rename"),
    Type.Literal("rename_file"),
    Type.Literal("code_actions"),
    Type.Literal("status"),
    Type.Literal("reload"),
    Type.Literal("capabilities"),
    Type.Literal("request"),
  ], { description: "OMP LSP action" }),
  file: Type.Optional(Type.String({ description: "File path" })),
  line: Type.Optional(Type.Integer({ minimum: 1, description: "Line number" })),
  symbol: Type.Optional(Type.String({ description: "Symbol substring" })),
  query: Type.Optional(Type.String({ description: "Query/filter" })),
  new_name: Type.Optional(Type.String({ description: "New symbol or destination path" })),
  apply: Type.Optional(Type.Boolean({ description: "Apply edits" })),
  timeout: Type.Optional(Type.Integer({ minimum: 1, description: "Request timeout seconds" })),
  payload: Type.Optional(Type.String({ description: "JSON-encoded raw request params" })),
});

export default function lspTool(pi: ExtensionAPI): void {
  pi.registerTool({
    name: "lsp",
    description: "OMP-shaped LSP contract shell; disabled until the real OMP LSP backend is ported.",
    parameters: LspParams,
    async execute(_toolCallId, params, _signal, _update, ctx) {
      const valid = validateParams(LspParams, params);
      if (!valid.ok) return valid.result;
      return errorResult(
        [
          "OMP LSP backend is not ported into miloc-pi yet.",
          "The previous regex/file-scan implementation was removed because it was not a real language-server surface.",
          "Port OMP LSP client/config/diagnostics/rename/code_actions behavior before enabling this tool.",
        ].join("\n"),
        {
          owner: "omp-lsp",
          ported: false,
          requestedAction: valid.value.action,
          projectRoot: ctx.session?.projectRoot ?? ctx.cwd,
          supportsActions: [
            "diagnostics",
            "definition",
            "references",
            "hover",
            "symbols",
            "implementation",
            "type_definition",
            "rename",
            "rename_file",
            "code_actions",
            "status",
            "reload",
            "capabilities",
            "request",
          ],
        },
      );
    },
  });
}