local ok, lspconfig = pcall(require, "lspconfig")

if not ok then
  return
end

local custom_attach = function(client, bufnr)
  local function buf_set_keymap(...)
    vim.api.nvim_buf_set_keymap(bufnr, ...)
  end

  local function buf_set_option(...)
    vim.api.nvim_buf_set_option(bufnr, ...)
  end

  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  local opts = { noremap=true, silent=true }

  -- See `:help vim.lsp.*` for documentation on any of the below functions
  buf_set_keymap('n', '<leader>h', '<Cmd>lua vim.lsp.buf.hover()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>gr', '<cmd>lua vim.lsp.buf.references()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>dl', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>dn', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>dp', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>de', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>gt', '<cmd>lua vim.lsp.buf.type_definition()<CR>', { noremap=true, silent=true })
  buf_set_keymap('n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', { noremap=true, silent=true })
  buf_set_keymap("n", "<leader>ff", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
  buf_set_keymap('n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
  buf_set_keymap('n', '<leader>dec', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
  --buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
  --buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
  --buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
  --buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
end

-- Go
lspconfig.gopls.setup{
  on_attach = custom_attach,
  cmd = {"gopls", "serve"},
  settings = {
    gopls = {
      analyses = {
        unusedparams = true,
      },
      staticcheck = true,
    },
    init_options = {
      usePlaceholders = true,
      completeUnimported = true,
      hoverKind = "FullDocumentation",
    },
  },
}

-- Golangci-lint language server
-- requires golangci-lint and golangci-lint-langserver
lspconfig.golangci_lint_ls.setup{}

-- Jsonnet
lspconfig.jsonnet_ls.setup{
  on_attach = custom_attach,
}

-- Terraform
lspconfig.terraformls.setup{
  on_attach = custom_attach,
  cmd       = {"terraform-ls", "serve"},
  filetypes = {"terraform", "hcl", "tf"},
  root_dir  = lspconfig.util.root_pattern{".terraform", ".git", "main.tf"},
}

-- Python
lspconfig.pylsp.setup{
  on_attach = custom_attach,
  cmd       = { "pylsp" },
  filetypes = { "python" },
}

-- Lua
local sumneko_root_path = vim.fn.expand('$HOME') .. "/Git/github.com/sumneko/lua-language-server"
local sumneko_binary = sumneko_root_path .. "/bin/Linux/lua-language-server"

lspconfig.sumneko_lua.setup {
  on_attach = custom_attach,
  cmd = {sumneko_binary, "-E", sumneko_root_path .. "/main.lua"},
  settings = {
    Lua = {
      runtime = {
        -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
        version = 'LuaJIT',
        -- Setup your lua path
        path = vim.split(package.path, ';')
      },
      diagnostics = {
        -- Get the language server to recognize the vim and awesome globals
        globals = {'vim', 'awesome'}
      },
      workspace = {
        -- Make the server aware of Neovim runtime files
        library = vim.api.nvim_get_runtime_file("", true),
      },
      telemetry = {
        -- Do not send telemetry data containing a randomized but unique identifier
        enable = false,
      },
    }
  }
}