local lsp_installer = require("nvim-lsp-installer")

local buf_map_keys = function(server_name, bufnr)
    local function buf_set_keymap(...)
        vim.api.nvim_buf_set_keymap(bufnr, ...)
    end

    local keymapOpts = {noremap = true, silent = true}
    buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>',
                   keymapOpts)
    buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>',
                   keymapOpts)
    buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', keymapOpts)
    buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<space>wa',
                   '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', keymapOpts)
    buf_set_keymap('n', '<space>wr',
                   '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<space>wl',
                   '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<space>D',
                   '<cmd>lua vim.lsp.buf.type_definition()<CR>', keymapOpts)
    buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>',
                   keymapOpts)
    buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<space>e',
                   '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>',
                   keymapOpts)
    buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>',
                   keymapOpts)
    buf_set_keymap('n', '<space>q',
                   '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', keymapOpts)
    buf_set_keymap('n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>',
                   keymapOpts)
end

-- Register a handler that will be called for all installed servers.
-- Alternatively, you may also register handlers on specific server instances instead (see example below).
lsp_installer.on_server_ready(function(server)
    local opts = {}

    -- Lua specific settings
    if server_name == "sumneko_lua" then
        local runtime_path = vim.split(package.path, ';')
        opts.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 = runtime_path
                },
                diagnostics = {
                    -- Get the language server to recognize the `vim` global
                    globals = {'vim'}
                },
                workspace = {
                    -- Make the server aware of Neovim runtime files
                    library = vim.api.nvim_get_runtime_file("", true)
                },
                -- Do not send telemetry data containing a randomized but unique identifier
                telemetry = {enable = false}
            }
        }
        opts.on_attach = buf_map_keys
        server:setup(opts)
    end
end)