// Server Registry - Maps a language id (or file extension) to an LSP server
// launcher plus the root markers that identify a project boundary.
//
// Add new servers here. `match` is a list of file extensions (no dot) OR
// language ids; either matches.
import * as fs from "node:fs";
import * as path from "node:path";
import type { ServerConfig } from "./src/types.ts";

// Resolve Python Path - Prefer the project's virtualenv when present so
// Pyright sees the same interpreter/dependencies as project commands.
function resolvePythonPath(rootDir: string): string | undefined {
  const candidates = [
    path.join(rootDir, ".venv", "bin", "python"),
    path.join(rootDir, "venv", "bin", "python"),
  ];
  return candidates.find((candidate) => fs.existsSync(candidate));
}

// Pyright Settings - Minimal editor settings needed for diagnostics and import
// resolution. Shared by workspace/configuration and didChangeConfiguration.
function pyrightSettings(rootDir: string): {
  pythonPath: string | undefined;
  analysis: {
    diagnosticMode: string;
    typeCheckingMode: string;
    autoSearchPaths: boolean;
    useLibraryCodeForTypes: boolean;
  };
} {
  return {
    pythonPath: resolvePythonPath(rootDir),
    analysis: {
      diagnosticMode: "openFilesOnly",
      typeCheckingMode: "basic",
      autoSearchPaths: true,
      useLibraryCodeForTypes: true,
    },
  };
}

// Global Root Markers — appended to every server's rootMarkers list
export const globalRootMarkers = [".git"];

export const servers: ServerConfig[] = [
  {
    id: "gopls",
    match: ["go"],
    command: "gopls",
    args: ["-remote=auto"],
    rootMarkers: ["go.work", "go.mod"],
    languageId: "go",
  },
  {
    id: "typescript-language-server",
    match: ["ts", "tsx", "js", "jsx", "mts", "cts"],
    command: "typescript-language-server",
    args: ["--stdio"],
    rootMarkers: ["pnpm-workspace.yaml", "tsconfig.json", "package.json"],
    languageId: "typescript",
  },
  {
    id: "pyright",
    match: ["py"],
    command: "pyright-langserver",
    args: ["--stdio"],
    rootMarkers: ["pyproject.toml", "setup.py", "setup.cfg"],
    languageId: "python",
    workspaceConfiguration: {
      initialSettings: ({ rootDir }) => ({ python: pyrightSettings(rootDir) }),
      getSection: (section, { rootDir }) => {
        const settings = pyrightSettings(rootDir);
        if (section === "python") return settings;
        if (section === "python.analysis") return settings.analysis;
        return null;
      },
    },
  },
  {
    id: "lua-language-server",
    match: ["lua"],
    command: "lua-language-server",
    args: [],
    rootMarkers: [".luarc.json"],
    languageId: "lua",
  },
  {
    id: "vscode-html-language-server",
    match: ["html", "css", "jsonl", "jsonc", "json"],
    command: "vscode-html-language-server",
    args: ["--stdio"],
    rootMarkers: ["package.json"],
    languageId: "html",
  },
  {
    id: "nil",
    match: ["nix"],
    command: "nil",
    args: [],
    rootMarkers: ["flake.nix"],
    languageId: "nix",
  },
  {
    id: "oxlint",
    match: ["ts", "tsx", "js", "jsx", "mjs", "cjs"],
    command: "oxlint",
    args: ["--lsp"],
    rootMarkers: [".oxlintrc.json", "oxlint.config.json"],
    languageId: "typescript",
    diagnosticsOnly: true,
  },
];