-- https://github.com/nvim-treesitter/nvim-treesitter/blob/main/doc/nvim-treesitter.txt
vim.api.nvim_create_autocmd("FileType", {
  pattern = { "c", "cpp", "lua", "typescript" },
  callback = function()
    vim.treesitter.start()
    vim.wo.foldexpr = "v:lua.vim.treesitter.foldexpr()"
    vim.wo.foldmethod = "expr"
    vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
  end,
})

-- https://github.com/nvim-tree/nvim-tree.lua/wiki/Open-At-Startup
vim.api.nvim_create_autocmd("VimEnter", {
  callback = function(data)
    -- buffer is a real file on the disk
    local real_file = vim.fn.filereadable(data.file) == 1

    -- buffer is a [No Name]
    local no_name = data.file == "" and vim.bo[data.buf].buftype == ""

    if not real_file and not no_name then return end

    -- open the tree, find the file but don't focus it
    require("nvim-tree.api").tree.toggle({ focus = false, find_file = true })
  end,
})

-- https://github.com/nvim-tree/nvim-tree.lua/wiki/Auto-Close
vim.api.nvim_create_autocmd("QuitPre", {
  callback = function()
    local invalid_win = {}
    local wins = vim.api.nvim_list_wins()

    for _, w in ipairs(wins) do
      local bufname = vim.api.nvim_buf_get_name(vim.api.nvim_win_get_buf(w))
      if bufname:match("NvimTree_") ~= nil then table.insert(invalid_win, w) end
    end

    if #invalid_win == #wins - 1 then
      -- Should quit, so we close all invalid windows.
      for _, w in ipairs(invalid_win) do
        vim.api.nvim_win_close(w, true)
      end
    end
  end,
})

vim.api.nvim_create_autocmd("LspAttach", {
  callback = function(event)
    local client = vim.lsp.get_client_by_id(event.data.client_id)
    local keymaps = require("config.keymaps")
    keymaps.lsp(event.buf, client)
  end,
})