local status, lspconfig = pcall(require, "lspconfig")
if not status then return end

local util = require "lspconfig/util"

local status, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
if not status then return end

local capabilities = cmp_nvim_lsp.default_capabilities()

lspconfig.gopls.setup {
    cmd = {"gopls", "serve"},
    filetypes = {"go", "gomod"},
    root_dir = util.root_pattern("go.work", "go.mod", ".git"),
    settings = {
        gopls = {
            analyses = {
                unusedparams = true,
            },
            staticcheck = true,
        },
    },
    capabilites = capabilites,
}

lspconfig.rust_analyzer.setup {
    -- Server-specific settings. See `:help lspconfig-setup`
    settings = {
        ['rust-analyzer'] = {},
    },
    capabilites = capabilites,
}

lspconfig.tsserver.setup {
}

vim.keymap.set('n', '<space>e', vim.diagnostic.open_float)
vim.keymap.set('n', '[d', vim.diagnostic.goto_prev)
vim.keymap.set('n', ']d', vim.diagnostic.goto_next)
vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist)

vim.api.nvim_create_autocmd('LspAttach', {
    group = vim.api.nvim_create_augroup('UserLspConfig', {}),
    callback = function(ev)
        -- Enable completion triggered by <c-x><c-o>
        vim.bo[ev.buf].omnifunc = 'v:lua.vim.lsp.omnifunc'

        -- Buffer local mappings.
        -- See `:help vim.lsp.*` for documentation on any of the below functions
        local opts = { buffer = ev.buf }
        vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, opts)
        vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
        vim.keymap.set('n', 'K', vim.lsp.buf.hover, opts)
        vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, opts)
        vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, opts)
        vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, opts)
        vim.keymap.set({ 'n', 'v' }, '<space>ca', vim.lsp.buf.code_action, opts)
        vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts)
    end,
})

local status, lspsignature = pcall(require, "lsp_signature")
if not status then return end

local cfg = {}
lspsignature.setup(cfg)

local status, cmp = pcall(require, "cmp")
if not status then return end

local status, luasnip = pcall(require, "luasnip")
if not status then return end

cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },
  sources = {
    { name = 'nvim_lsp' },
    { name = 'luasnip' },
  },
}