local lsp = require('lsp-zero').preset({})

lsp.on_attach(function(client, bufnr)
  -- see :help lsp-zero-keybindings
  -- to learn the available actions
  local opts = {buffer = bufnr, remap = false}
  vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
  vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
  vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
  vim.keymap.set("n", "<leader>vd", function() vim.diagnostic.open_float() end, opts)
  vim.keymap.set("n", "[d", function() vim.diagnostic.goto_prev() end, opts)
  vim.keymap.set("n", "]d", function() vim.diagnostic.goto_next() end, opts)
  vim.keymap.set("n", "<leader>vca", function() vim.lsp.buf.code_action() end, opts)
  vim.keymap.set("n", "<leader>vrr", function() vim.lsp.buf.references() end, opts)
  vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
  vim.keymap.set("n", "<leader>vbf", function() vim.lsp.buf.format() end, opts)
  vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, {buffer = bfnr})
end)

-- specific setup for python as it's lsp does not come with formatting
require('lspconfig').pyright.setup({
  single_file_support = false,
  on_attach = function(client, bufnr)
    local opts = {buffer = bfnr}
    vim.keymap.set({'n', 'x'}, '<leader>vpf', function()
      local filename = GetCurrFileName()
      vim.cmd(":silent !autopep8 -i " .. filename)
      vim.cmd(":silent !isort " .. filename)
      end, opts)
  end
})

lsp.setup()

local cmp = require('cmp')
local cmp_action = require('lsp-zero').cmp_action()

cmp.setup({
  sources = {
    { name = 'nvim_lsp' },
    { name = 'nvim_lua' },
    { name = 'buffer' },
  },
  preselect = 'item',
  completion = {
    autocomplete = false,
    completeopt = 'menu,menuone,noinsert'
  },
  mapping = cmp.mapping.preset.insert({
    -- Ctrl+Space to trigger completion menu
    ['<C-Space>'] = cmp.mapping.complete(),

    -- Navigate between snippet placeholder
    -- @note: don't know what this is
    ['<C-f>'] = cmp_action.luasnip_jump_forward(),
    ['<C-b>'] = cmp_action.luasnip_jump_backward(),

    -- Scroll up and down in the completion documentation
    ['<C-u>'] = cmp.mapping.scroll_docs(-4),
    ['<C-d>'] = cmp.mapping.scroll_docs(4),
  }),
  snippet = {
    expand = function(args)
      require('luasnip').lsp_expand(args.body)
    end,
  },
})