local lsp_config = require 'lspconfig'

-- always show signcolumns
vim.opt.signcolumn = "yes"

-- Mappings.
-- See `:help vim.diagnostic.*` for documentation on any of the below functions
local opts = { noremap=true, silent=true }
vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, opts)
vim.keymap.set('n', '[c', vim.diagnostic.goto_prev, opts)
vim.keymap.set('n', ']c', vim.diagnostic.goto_next, opts)
vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(client, bufnr)
  -- Enable completion triggered by <c-x><c-o>
  vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- Mappings.
  -- See `:help vim.lsp.*` for documentation on any of the below functions
  local bufopts = { noremap=true, silent=true, buffer=bufnr }
  vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
  vim.keymap.set('n', 'gy', vim.lsp.buf.type_definition, bufopts)
  vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
  vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
  vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, bufopts)
  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
  vim.keymap.set('n', '<space>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, bufopts)
  vim.keymap.set('n', '<localleader>n', vim.lsp.buf.rename, bufopts)
  vim.keymap.set('n', '<localleader>a', vim.lsp.buf.code_action, bufopts)
  vim.keymap.set('n', '<localleader>f', vim.lsp.buf.formatting, bufopts)
end

-------------------------------------------------------------------------------
-- See: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
--
-- nix
lsp_config.nil_ls.setup { on_attach = on_attach }

--[[
-- js,ts
lsp_config.tsserver.setup { on_attach = on_attach }
lsp_config.eslint.setup { on_attach = on_attach }

-- rust
lsp_config.rust_analyzer.setup {
    on_attach = on_attach,
    -- Server-specific settings...
    settings = {
      ["rust-analyzer"] = {
        "server.path" = "rust-analyzer";
        "updates.prompt" = false;
        "updates.checkOnStartup" = false;
        "checkOnSave.enable" = true;
        "checkOnSave.command" = "clippy";
        "cargo.autoreload" = true;
      }
    }
}
]]--