local custom_group = vim.api.nvim_create_augroup('custom', { clear = true })

vim.api.nvim_create_autocmd('TextYankPost', {
    group = custom_group,
    pattern = '*',
    callback = function()
        vim.highlight.on_yank({
            higroup = 'Visual',
            timeout = 100,
        })
    end,
    desc = 'Highlight on yank',
})

-- Remove items from quickfix list.
-- `dd` to delete in Normal
-- `d` to delete Visual selection
local function delete_qf_items()
    local mode = vim.api.nvim_get_mode()['mode']

    local start_idx
    local count

    if mode == 'n' then
        -- Normal mode
        start_idx = vim.fn.line('.')
        count = vim.v.count > 0 and vim.v.count or 1
    else
        -- Visual mode
        local v_start_idx = vim.fn.line('v')
        local v_end_idx = vim.fn.line('.')

        start_idx = math.min(v_start_idx, v_end_idx)
        count = math.abs(v_end_idx - v_start_idx) + 1

        -- Go back to normal
        vim.api.nvim_feedkeys(
            vim.api.nvim_replace_termcodes(
                '<esc>', -- what to escape
                true, -- Vim leftovers
                false, -- Also replace `<lt>`?
                true -- Replace keycodes (like `<esc>`)?
            ),
            'x', -- Mode flag
            false -- Should be false, since we already `nvim_replace_termcodes()`
        )
    end

    local qflist = vim.fn.getqflist()

    for _ = 1, count, 1 do
        table.remove(qflist, start_idx)
    end

    vim.fn.setqflist(qflist, 'r')
    vim.fn.cursor(start_idx, 1)
end

vim.api.nvim_create_autocmd('FileType', {
    group = custom_group,
    pattern = 'qf',
    callback = function()
        -- Do not show quickfix in buffer lists.
        vim.api.nvim_buf_set_option(0, 'buflisted', false)

        -- Escape closes quickfix window.
        vim.keymap.set(
            'n',
            '<ESC>',
            '<CMD>cclose<CR>',
            { buffer = true, remap = false, silent = true }
        )

        -- `dd` deletes an item from the list.
        vim.keymap.set('n', 'dd', delete_qf_items, { buffer = true })
        vim.keymap.set('x', 'd', delete_qf_items, { buffer = true })
    end,
    desc = 'Quickfix tweaks',
})