local lspKeys = function(client, bufnr)
  local base_opts = { noremap = true, silent = false, buffer = bufnr }

  local function opts(desc) return vim.tbl_extend('error', base_opts, { desc = desc }) end

  local mappings = {
    { mode = { 'n', 'x' }, key = '<space>a', fn = vim.lsp.buf.code_action, desc = 'Code action' },
    { mode = 'n', key = '<space>e', fn = vim.lsp.buf.declaration, desc = 'Declaration' },
    { mode = 'n', key = '<space>h', fn = function() vim.lsp.buf.hover({ border = 'none' }) end, desc = 'Hover' },
    { mode = 'n', key = '<space>c', fn = vim.lsp.buf.outgoing_calls, desc = 'Outgoing calls' },
    { mode = 'n', key = '<space>C', fn = vim.lsp.buf.incoming_calls, desc = 'Incoming calls' },
    { mode = 'n', key = '<space>m', fn = vim.lsp.buf.rename, desc = 'Rename' },
    { mode = 'n', key = '<space>D', fn = vim.lsp.buf.type_definition, desc = 'Type definition' },
    { mode = { 'n', 'i', 'x' }, key = '<C-k>', fn = vim.lsp.buf.signature_help, desc = 'Signature help' },
    { mode = 'n', key = '<space>v', fn = function() vim.diagnostic.open_float({ border = 'rounded' }) end, desc = 'Diagnostics Float' },
    { mode = 'n', key = '<A-o>', fn = '<cmd>ClangdSwitchSourceHeader<CR>', desc = 'Switch Source/Header' },
  }

  for _, map in ipairs(mappings) do
    vim.keymap.set(map.mode, map.key, map.fn, opts(map.desc))
  end

  if client.supports_method('inlayHintProvider') then
    vim.keymap.set(
      'n',
      '<space>i',
      function() vim.lsp.inlay_hint.enable(not vim.lsp.inlay_hint.is_enabled({ bufnr = bufnr }), { bufnr = bufnr }) end,
      opts('Toggle inlay hints')
    )
  end
end

return {
  {
    'neovim/nvim-lspconfig',
    dependencies = {
      'williamboman/mason.nvim',
      'williamboman/mason-lspconfig.nvim',
      'SmiteshP/nvim-navic',
    },
    lazy = false,
    config = function()
      local servers = {
        basedpyright = {
          settings = {
            basedpyright = {
              typeCheckingMode = 'standard',
            },
          },
        },
        ruff = {},
        clangd = {
          cmd = {
            'clangd',
            '--compile-commands-dir=build_nvim',
            '--query-driver',
            '/opt/cortex-a78-2022.08-gcc12.1-linux5.15/bin/aarch64-linux-gnu-g*',
            '--clang-tidy',
            '--background-index',
            '--use-dirty-headers',
            '--completion-style=detailed',
          },
          root_markers = {
            '.clangd',
            '.clang-tidy',
            '.clang-format',
            'compile_flags.txt',
            'configure.ac',
            '.git',
            'build_nvim',
          },
        },
        lua_ls = {
          settings = {
            Lua = {
              workspace = {
                checkThirdParty = false,
              },
              completion = {
                callSnippet = 'Replace',
              },
              -- Do not send telemetry data containing a randomized but unique identifier
              telemetry = {
                enable = false,
              },
              diagnostics = {
                disable = { 'missing-fields' },
              },
              format = {
                enable = false,
              },
            },
          },
        },
        jsonls = {},
        dockerls = {},
        yamlls = {
          settings = {
            yaml = {
              validate = true,
            },
          },
        },
        neocmake = {},
        markdown_oxide = {},
      }

      require('mason').setup()
      require('mason-lspconfig').setup({
        ensure_installed = vim.tbl_keys(servers or {}),
      })

      local capabilities = vim.lsp.protocol.make_client_capabilities()
      capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)
      vim.lsp.config('*', {
        capabilities = capabilities,
      })

      for server, settings in pairs(servers) do
        vim.lsp.config(server, settings)
        vim.lsp.enable(server)
      end

      local lsp_group = vim.api.nvim_create_augroup('UserLspAttach', { clear = true })
      vim.api.nvim_create_autocmd('LspAttach', {
        group = lsp_group,
        desc = 'Set buffer‑local keymaps and options after an LSP client attaches',
        callback = function(args)
          local bufnr = args.buf
          local client = vim.lsp.get_client_by_id(args.data.client_id)
          if not client then
            return
          end
          lspKeys(client, bufnr)

          if client.server_capabilities.completionProvider then
            vim.bo[bufnr].omnifunc = 'v:lua.vim.lsp.omnifunc'
            vim.bo[bufnr].formatexpr = 'v:lua.vim.lsp.formatexpr()'
          end

          if client.server_capabilities.documentSymbolProvider then
            local navic = require('nvim-navic')
            navic.attach(client, bufnr)
          end
        end,
      })
    end,
  },
}