require("utility.misc")

function table.filter(list, predicate)
	local filtered_list = {}

	for _, item in ipairs(list) do
		if predicate(item) then
			table.insert(filtered_list, item)
		end
	end

	return filtered_list
end

local function split(inputstr, sep)
	if sep == nil then
			sep = "%s"
	end
	local t={}
	for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
			table.insert(t, str)
	end
	return t
end

local function file_exists(name)
   local f=io.open(name,"r")

   if f~=nil then io.close(f) return true else return false end
end

function _G.check_back_space()
	local col = vim.api.nvim_win_get_cursor(0)[2]

	if col == 0 then
		return true
	end

	return vim.api.nvim_get_current_line():sub(col, col):find("%s") and true
end

function _G.show_documentation()
	if vim.fn.index({"vim", "help"}, vim.bo.filetype) >= 0 then
		vim.cmd("help " .. vim.fn.expand("<cword>"))
	elseif vim.fn["coc#rpc#ready()"] then
		vim.fn.CocActionAsync("doHover")
	else
		vim.cmd(vim.go.keywordprg .. " " .. vim.fn.expand("<cword>"))
	end
end

function _G.toggle_terminal(height)
    if vim.fn.win_gotoid(vim.g.term_win) == 1 then
        vim.g.is_term_open = 0
		vim.cmd("quit!")
    else
        vim.cmd("botright new")

        vim.cmd("resize " .. height)

        if not pcall(function() vim.cmd("buffer " .. vim.g.term_buf) end) then
            vim.fn.termopen(vim.env.SHELL, {detach=0})

            vim.g.term_buf = vim.fn.bufnr("")

            vim.o.number = false
            vim.o.relativenumber = false
            vim.o.signcolumn = "no"
		end

        vim.cmd("startinsert!")

        vim.g.term_win = vim.fn.win_getid()
        vim.g.is_term_open = 1

        if vim.fn.exists("g:NERDTree") and vim.api.nvim_eval("g:NERDTree.IsOpen()") then
            vim.cmd("NERDTreeFocus")

            vim.cmd("wincmd H")

            local width_diff = vim.fn.winwidth(0) - vim.g.NERDTreeWinSize

            vim.cmd(width_diff .. "wincmd <")

            vim.cmd("wincmd p")

            vim.fn.feedkeys("A")
        end
    end
end

function _G.get_current_file()
    return vim.fn.expand("%")
end

function _G.remove_hidden_windowless_buffers()
	local all_buffers = vim.fn.getbufinfo()

	local buffers = table.filter(all_buffers, function (item)
		local windows = item.windows

		return #windows == 0 and item.hidden
	end)

	for _, buffer in ipairs(buffers) do
		vim.api.nvim_buf_delete(buffer.bufnr, { force = true })
	end
end

function _G.close_current_buffer()
	local current_buf_nr = vim.fn.bufnr()

	local all_buffers = vim.fn.getbufinfo()

	local buffers = table.filter(
		all_buffers,
		function(buf_info)
			return buf_info.loaded == 1
				and buf_info.listed == 1
				and buf_info.bufnr ~= current_buf_nr
				and not string.find(buf_info.name, "NERD_tree_")
				and not string.find(buf_info.name, "term://")
		end
	)

	if #buffers ~= 0 then
		vim.cmd("buffer " .. buffers[1].bufnr)
	else
		vim.cmd("new")
	end

	vim.api.nvim_buf_delete(current_buf_nr, { force = true })

	-- Resize terminal
	if vim.g.is_term_open == 1 then
		vim.cmd("wincmd j")
		vim.cmd("resize " .. vim.g.terminal_height)
		vim.cmd("wincmd k")
	end
end

num = vim.fn.system("od -A n -t d -N 3 /dev/random")

num = num:gsub("%s+", "")
num = num:gsub("%s+", "")

function _G.prepare_pr_review_curr_buf()
	local buf_name = vim.fn.bufname()

	local buf_name_parts = split(buf_name, "/")

	local buf_file = buf_name_parts[#buf_name_parts]
	local side = buf_name_parts[#buf_name_parts - 1]

	local tmp_file = "/tmp/nvim-pr-review-" ..  num .. "-"
		.. side .. "-" .. buf_file

	if file_exists(tmp_file) then
		return
	end

	local lines = vim.api.nvim_buf_get_lines(0, 0, -1, true)

	local file = io.open(tmp_file, "a")

	if file == nil then
		error("Temporary file not created")
		return
	end

	for _, line in next, lines, nil do
		file:write(line)
	end

	file:close()

	vim.api.nvim_buf_set_name(0, tmp_file)
end

function _G.unprepare_pr_review_curr_buf()
	local buf_name = vim.fn.bufname()

	local buf_name_parts = split(buf_name, "/")

	local buf_file = buf_name_parts[#buf_name_parts]
	local side = buf_name_parts[#buf_name_parts - 1]

	local tmp_file = "/tmp/nvim-pr-review-" ..  num .. "-"
		.. side .. "-" .. buf_file

	if file_exists(tmp_file) == false then
		return
	end

	os.remove(tmp_file)
end