nvim/lua/plugins/lsp/init.lua

local M = {
  "WhoIsSethDaniel/mason-tool-installer.nvim",
  dependencies = {
    "mason-org/mason-lspconfig.nvim",
    "mason-org/mason.nvim",
    "j-hui/fidget.nvim",
    "ibhagwan/fzf-lua",
    require("plugins.lsp.extras.lazydev"),
    require("plugins.lsp.extras.gopher"),
  },
}

local function setup_keymaps(bufnr)
  local fzf = require("fzf-lua")
  local opts = { buffer = bufnr }

  -- Basic LSP
  nmap("K", vim.lsp.buf.hover, vim.tbl_extend("force", opts, { desc = "Hover Doc" }))
  nmap("<C-h>", vim.lsp.buf.signature_help, vim.tbl_extend("force", opts, { desc = "Signature Help" }))
  nmap("<leader>r", vim.lsp.buf.rename, vim.tbl_extend("force", opts, { desc = "Rename" }))
  nmap("<leader>ca", vim.lsp.buf.code_action, vim.tbl_extend("force", opts, { desc = "Code Action" }))

  -- Navigation
  nmap("gd", fzf.lsp_definitions, vim.tbl_extend("force", opts, { desc = "Go to Definition" }))
  nmap("gr", fzf.lsp_references, vim.tbl_extend("force", opts, { desc = "Go to References" }))
  nmap("gD", vim.lsp.buf.declaration, vim.tbl_extend("force", opts, { desc = "Go to Declaration" }))
  nmap("gi", fzf.lsp_implementations, vim.tbl_extend("force", opts, { desc = "Go to Implementation" }))
  nmap("gt", fzf.lsp_typedefs, vim.tbl_extend("force", opts, { desc = "Go to Type Definition" }))

  -- Diagnostics
  nmap("vd", vim.diagnostic.open_float, vim.tbl_extend("force", opts, { desc = "View Diagnostics" }))
  nmap("<leader>dl", fzf.diagnostics_document, vim.tbl_extend("force", opts, { desc = "Document Diagnostics" }))
  nmap("<leader>dw", fzf.diagnostics_workspace, vim.tbl_extend("force", opts, { desc = "Workspace Diagnostics" }))
  nmap("<leader>ds", fzf.lsp_document_symbols, vim.tbl_extend("force", opts, { desc = "Document Symbols" }))
  nmap("<leader>ws", fzf.lsp_workspace_symbols, vim.tbl_extend("force", opts, { desc = "Workspace Symbols" }))

  -- LSP management
  nmap("<leader>lr", function()
    local clients = vim.lsp.get_clients({ bufnr = bufnr })
    if #clients == 0 then
      vim.notify("No LSP clients attached to buffer", vim.log.levels.WARN)
      return
    end

    local client_names = {}
    for _, client in ipairs(clients) do
      table.insert(client_names, client.name)
      vim.cmd("LspRestart " .. client.name)
    end
    vim.notify("Restarted LSP clients: " .. table.concat(client_names, ", "), vim.log.levels.INFO)
  end, vim.tbl_extend("force", opts, { desc = "Restart LSP" }))
  nmap("<leader>li", ":LspInfo<CR>", vim.tbl_extend("force", opts, { desc = "LSP Info" }))
end

function M.config()
  require("mason").setup({ max_concurrent_installers = 4 })
  require("fidget").setup({})

  local orig_util_open_floating_preview = vim.lsp.util.open_floating_preview
  function vim.lsp.util.open_floating_preview(contents, syntax, opts, ...)
    opts = opts or {}
    opts.border = opts.border or "rounded"
    opts.max_width = opts.max_width or 80
    opts.max_height = opts.max_height or 20
    return orig_util_open_floating_preview(contents, syntax, opts, ...)
  end

  -- Diagnostics
  vim.diagnostic.config({
    virtual_text = { spacing = 2, source = "if_many" },
    float = { border = "rounded", source = "if_many" },
    severity_sort = true,
    signs = vim.g.have_nerd_font and {
      text = {
        [vim.diagnostic.severity.ERROR] = "󰅚",
        [vim.diagnostic.severity.WARN] = "󰀪",
        [vim.diagnostic.severity.INFO] = "󰋽",
        [vim.diagnostic.severity.HINT] = "󰌶",
      },
    } or {},
  })

  local servers = {
    "gopls",
    "jsonls",
    "lua_ls",
    "yamlls",
    "graphql",
    "html",
    "omnisharp",
    "svelte",
    "vtsls",
    "ccls",
    "templ",
  }

  local tools = {
    "prettierd",
    "shfmt",
    "stylua",
    "latexindent",
    "clang-format",
    "csharpier",
    "quick-lint-js",
  }

  local mason_unsupported = { "ccls" }

  local mason_servers = vim.tbl_filter(function(server)
    return not vim.tbl_contains(mason_unsupported, server)
  end, servers)

  require("mason-lspconfig").setup({
    ensure_installed = mason_servers,
    automatic_installation = true,
    automatic_enable = true,
  })
  require("mason-tool-installer").setup({ ensure_installed = tools })

  vim.lsp.enable(servers)

  -- LSP Attach
  vim.api.nvim_create_autocmd("LspAttach", {
    group = vim.api.nvim_create_augroup("UserLspConfig", { clear = true }),
    callback = function(args)
      local client = vim.lsp.get_client_by_id(args.data.client_id)
      if not client then
        return
      end

      setup_keymaps(args.buf)

      -- Inlay hints
      if client:supports_method(vim.lsp.protocol.Methods.textDocument_inlayHint, args.buf) then
        nmap("<leader>th", function()
          vim.lsp.inlay_hint.enable(not vim.lsp.inlay_hint.is_enabled({ bufnr = args.buf }), { bufnr = args.buf })
        end, { buffer = args.buf, desc = "Toggle Inlay Hints" })
      end

      -- Document highlights
      if client.server_capabilities.documentHighlightProvider then
        vim.api.nvim_create_autocmd({ "CursorHold", "CursorHoldI" }, {
          buffer = args.buf,
          callback = vim.lsp.buf.document_highlight,
        })
        vim.api.nvim_create_autocmd({ "CursorMoved", "CursorMovedI" }, {
          buffer = args.buf,
          callback = vim.lsp.buf.clear_references,
        })
      end
    end,
  })
end

return M