local previewers = require('telescope.previewers')
local previewers_utils = require('telescope.previewers.utils')
local builtin = require('telescope.builtin')
local sorters = require('telescope.sorters')
local actions = require('telescope.actions')

local max_size = 100000
local truncate_large_files = function(filepath, bufnr, opts)
    opts = opts or {}

    filepath = vim.fn.expand(filepath)
    vim.loop.fs_stat(filepath, function(_, stat)
        if not stat then return end
        if stat.size > max_size then
            local cmd = {"head", "-c", max_size, filepath}
            previewers_utils.job_maker(cmd, bufnr, opts)
        else
            previewers.buffer_previewer_maker(filepath, bufnr, opts)
        end
    end)
end

require('telescope').setup({
	defaults = {
		file_sorter = sorters.get_fzy_sorter,
		prompt_prefix = ' >',
		color_devicons = true,

        buffer_previewer_maker = truncate_large_files,

        initial_mode = "insert",
        selection_strategy = "reset",
        sorting_strategy = "ascending",
        layout_strategy = "horizontal",
        layout_config = {
            horizontal = {
                prompt_position = "top",
                preview_width = 0.55,
                results_width = 0.8,
            },
            vertical = {
                mirror = false,
            },
            width = 0.87,
            height = 0.80,
            preview_cutoff = 120,
        },
        path_display = { "truncate" },
        winblend = 0,
        border = {},
        borderchars = { "─", "│", "─", "│", "╭", "╮", "╯", "╰" },

		mappings = {
			i = {
				['<C-x>'] = false,
				['<C-q>'] = actions.send_to_qflist,
			},
		},
	},
})

function git_branches ()
	builtin.git_branches({
		attach_mappings = function(_, map)
			map("i", "<c-d>", actions.git_delete_branch)
			map("n", "<c-d>", actions.git_delete_branch)
			return true
		end,
	})
end

function files ()
    local ran, errorMessage = pcall(function()
        builtin.git_files({ show_untracked = true })
    end)
    if not ran then
        builtin.find_files()
    end
end

local options = { noremap = true }

vim.keymap.set('n', '<C-g>', builtin.live_grep, options)

vim.keymap.set('n', '<C-p>', files, options)

vim.keymap.set('n', '<leader>df', function()
	builtin.find_files({
		prompt_title = "< VimRC >",
		cwd = vim.fn.expand('~/.config/nvim'),
		hidden = true,
	})
end, options)

vim.keymap.set('n', '<leader>fb', builtin.buffers, options)
vim.keymap.set('n', '<leader>fo', builtin.oldfiles, options)

vim.keymap.set('n', '<leader>gr', builtin.lsp_references, options)
vim.keymap.set("n", '<leader>gi', builtin.lsp_implementations, options)
vim.keymap.set("n", '<leader>gT', builtin.lsp_type_definitions, options)

vim.keymap.set('n', '<leader>m', builtin.marks, options)
vim.keymap.set('n', '<leader>ch', builtin.command_history, options)

vim.keymap.set('n', '<leader>gb', git_branches, options)
vim.keymap.set('n', '<leader>gs', builtin.git_status, options)