local nvim_lsp = require("lspconfig")

local format_async = function(err, _, result, _, bufnr)
    if err ~= nil or result == nil then return end
    if not vim.api.nvim_buf_get_option(bufnr, "modified") then
        local view = vim.fn.winsaveview()
        vim.lsp.util.apply_text_edits(result, bufnr)
        vim.fn.winrestview(view)
        if bufnr == vim.api.nvim_get_current_buf() then
            vim.api.nvim_command("noautocmd :update")
        end
    end
end
vim.lsp.handlers["textDocument/formatting"] = format_async

local on_attach = function(client, bufnr)
    local buf_map = vim.api.nvim_buf_set_keymap

    vim.cmd("command! LspDef lua vim.lsp.buf.definition()")
    vim.cmd("command! LspFormatting lua vim.lsp.buf.formatting()")
    vim.cmd("command! LspCodeAction lua vim.lsp.buf.code_action()")
    vim.cmd("command! LspHover lua vim.lsp.buf.hover()")
    vim.cmd("command! LspRename lua vim.lsp.buf.rename()")
    vim.cmd("command! LspOrganize lua lsp_organize_imports()")
    vim.cmd("command! LspRefs lua vim.lsp.buf.references()")
    vim.cmd("command! LspTypeDef lua vim.lsp.buf.type_definition()")
    vim.cmd("command! LspImplementation lua vim.lsp.buf.implementation()")
    vim.cmd("command! LspDiagPrev lua vim.lsp.diagnostic.goto_prev()")
    vim.cmd("command! LspDiagNext lua vim.lsp.diagnostic.goto_next()")
    vim.cmd("command! LspDiagLine lua vim.lsp.diagnostic.show_line_diagnostics()")
    vim.cmd("command! LspSignatureHelp lua vim.lsp.buf.signature_help()")

    buf_map(bufnr, "n", "gd", ":LspDef<CR>", {silent = true})
    buf_map(bufnr, "n", "gr", ":LspRename<CR>", {silent = true})
    buf_map(bufnr, "n", "gR", ":LspRefs<CR>", {silent = true})
    buf_map(bufnr, "n", "gy", ":LspTypeDef<CR>", {silent = true})
    buf_map(bufnr, "n", "K", ":LspHover<CR>", {silent = true})
    buf_map(bufnr, "n", "gs", ":LspOrganize<CR>", {silent = true})
    buf_map(bufnr, "n", "[a", ":LspDiagPrev<CR>", {silent = true})
    buf_map(bufnr, "n", "]a", ":LspDiagNext<CR>", {silent = true})
    buf_map(bufnr, "n", "ga", ":LspCodeAction<CR>", {silent = true})
    buf_map(bufnr, "n", "<Leader>a", ":LspDiagLine<CR>", {silent = true})
    buf_map(bufnr, "i", "<C-x><C-x>", "<cmd> LspSignatureHelp<CR>", {silent = true})

    if client.resolved_capabilities.document_formatting then
        vim.api.nvim_exec([[
         augroup LspAutocommands
             autocmd! * <buffer>
             autocmd BufWritePost <buffer> LspFormatting
         augroup END
         ]], true)
    end
end

nvim_lsp.diagnosticls.setup {
    on_attach = on_attach
}

nvim_lsp.elmls.setup{
  on_attach = on_attach;
}
nvim_lsp.tsserver.setup {
    on_attach = function(client)
        -- Avoid conflict with prettier
        client.resolved_capabilities.document_formatting = false
        on_attach(client)
    end
}
nvim_lsp.elixirls.setup{
  cmd = { "elixir-ls" };
  on_attach = on_attach;
}
nvim_lsp.rnix.setup{
  cmd = { "@rnix_lsp@/bin/rnix-lsp" };
  on_attach = on_attach;
}
nvim_lsp.rust_analyzer.setup{
  on_attach = on_attach;
}

nvim_lsp.sumneko_lua.setup{
  cmd = { "@lua_ls@/bin/lua-language-server" };
  on_attach = on_attach;
  settings = {
    Lua = {
      diagnostics = {
          globals = { 'vim' }
      }
    }
  };
}