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

local log_directory = vim.env.LOG_HOME

if not ok then
  return
end

local custom_attach = function(_, bufnr)
  local opts = { noremap=true, silent=true, buffer=bufnr }

  -- Enable completion triggered by <c-x><c-o>
  vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- See `:help vim.diagnostic.*` for documentation on any of the diagnostics functions
  vim.keymap.set('n', '<leader>h',   vim.lsp.buf.hover, opts)
  vim.keymap.set('n', '<leader>gd',  vim.lsp.buf.definition, opts)
  vim.keymap.set('n', '<leader>gr',  vim.lsp.buf.references, opts)
  vim.keymap.set('n', '<leader>gi',  vim.lsp.buf.implementation, opts)
  vim.keymap.set('n', '<leader>dl',  vim.diagnostic.setloclist, opts)
  vim.keymap.set('n', '<leader>dn',  vim.diagnostic.goto_next, opts)
  vim.keymap.set('n', '<leader>dp',  vim.diagnostic.goto_prev, opts)
  vim.keymap.set('n', '<leader>gt',  vim.lsp.buf.type_definition, opts)
  vim.keymap.set('n', '<leader>rn',  vim.lsp.buf.rename, opts)
  vim.keymap.set("n", '<leader>ff',  function() vim.lsp.buf.format{ async = true } end, opts)
  vim.keymap.set('n', '<leader>ca',  vim.lsp.buf.code_action, opts)
  vim.keymap.set('n', '<leader>dec', vim.lsp.buf.declaration, opts)
  --buf_set_keymap('n', '<C-k>', vim.lsp.buf.signature_help, opts)
  --buf_set_keymap('n', '<space>wa', vim.lsp.buf.add_workspace_folder, opts)
  --buf_set_keymap('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, opts)
  --buf_set_keymap('n', '<space>wl', function() print(vim.inspect(vim.lsp.buf.list_workspace_folders())) end', opts)
end

local lsp_flags = {
  debounce_text_changes = 150,
}

-- Go
lspconfig.gopls.setup{
  on_attach = custom_attach,
  cmd = {"gopls", "serve", "-logfile="..log_directory.."/gopls.log"},
  settings = {
    gopls = {
      analyses = {
        unusedparams = true,
      },
      gofumpt = true,
      staticcheck = true,
    },
    init_options = {
      usePlaceholders = true,
      completeUnimported = true,
      hoverKind = "FullDocumentation",
    },
  },
  flags = lsp_flags,
}

-- Golangci-lint language server
-- requires golangci-lint and golangci-lint-langserver
lspconfig.golangci_lint_ls.setup{
  flags = lsp_flags,
}

-- Jsonnet
lspconfig.jsonnet_ls.setup{
  on_attach = custom_attach,
  cmd = {"jsonnet-language-server", "--lint"},
  flags = lsp_flags,
}

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

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

-- 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,
      },
    }
  },
  flags = lsp_flags,
}