local jdtls_bin = vim.fn.stdpath("data") .. "/mason/bin/jdtls"

local keymap = vim.keymap -- for conciseness

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

local lsp_attach = function(client, bufnr)
  require("jdtls.dap").setup_dap_main_class_configs() -- Discover main classes for debugging

  opts.buffer = bufnr

  -- set keybinds
  opts.desc = "Show LSP references"
  keymap.set("n", "gR", "<cmd>Telescope lsp_references<CR>", opts) -- show definition, references

  opts.desc = "Go to declaration"
  keymap.set("n", "gD", vim.lsp.buf.declaration, opts) -- go to declaration

  opts.desc = "Show LSP definitions"
  keymap.set("n", "gd", "<cmd>Telescope lsp_definitions<CR>", opts) -- show lsp definitions

  opts.desc = "Show LSP implementations"
  keymap.set("n", "gi", "<cmd>Telescope lsp_implementations<CR>", opts) -- show lsp implementations

  opts.desc = "Show LSP type definitions"
  keymap.set("n", "gt", "<cmd>Telescope lsp_type_definitions<CR>", opts) -- show lsp type definitions

  opts.desc = "See available code actions"
  keymap.set({ "n", "v" }, "<leader>ca", vim.lsp.buf.code_action, opts) -- see available code actions, in visual mode will apply to selection

  opts.desc = "Smart rename"
  keymap.set("n", "<leader>rn", vim.lsp.buf.rename, opts) -- smart rename

  opts.desc = "Show buffer diagnostics"
  keymap.set("n", "<leader>D", "<cmd>Telescope diagnostics bufnr=0<CR>", opts) -- show  diagnostics for file

  opts.desc = "Show line diagnostics"
  keymap.set("n", "<leader>d", vim.diagnostic.open_float, opts) -- show diagnostics for line

  opts.desc = "Go to previous diagnostic"
  keymap.set("n", "[d", vim.diagnostic.goto_prev, opts) -- jump to previous diagnostic in buffer

  opts.desc = "Go to next diagnostic"
  keymap.set("n", "]d", vim.diagnostic.goto_next, opts) -- jump to next diagnostic in buffer

  opts.desc = "Show documentation for what is under cursor"
  keymap.set("n", "K", vim.lsp.buf.hover, opts) -- show documentation for what is under cursor

  opts.desc = "Restart LSP"
  keymap.set("n", "<leader>rs", ":LspRestart<CR>", opts) -- mapping to restart lsp if necessary
end

local config = {
  cmd = { jdtls_bin },
  root_dir = vim.fs.dirname(vim.fs.find({ "gradlew", ".git", "mvnw" }, { upward = true })[1]),
  on_attach = lsp_attach,
  init_options = {
    bundles = {
      vim.fn.glob(
        vim.fn.stdpath("data")
          .. "/java-debug/com.microsoft.java.debug.plugin/target/com.microsoft.java.debug.plugin-*.jar",
        1
      ),
    },
  },
}

require("jdtls").start_or_attach(config)