M = require('Trans').metatable('util')

local fn, api = vim.fn, vim.api

function M.get_select()
    local _start = fn.getpos("v")
    local _end = fn.getpos('.')

    if _start[2] > _end[2] or (_start[3] > _end[3] and _start[2] == _end[2]) then
        _start, _end = _end, _start
    end
    local s_row, s_col = _start[2], _start[3]
    local e_row, e_col = _end[2], _end[3]

    -- print(s_row, e_row, s_col, e_col)
    ---@type string
    ---@diagnostic disable-next-line: assign-type-mismatch
    local line = fn.getline(e_row)
    local uidx = vim.str_utfindex(line, math.min(#line, e_col))
    ---@diagnostic disable-next-line: param-type-mismatch
    e_col = vim.str_byteindex(line, uidx)


    if s_row == e_row then
        return line:sub(s_col, e_col)
    else
        local lines = fn.getline(s_row, e_row)
        local e = #lines
        lines[1] = lines[1]:sub(s_col)
        lines[e] = line:sub(1, e_col)
        return table.concat(lines)
    end
end

---Get Text which need to be translated
---@param mode string 'n' | 'v' | 'i'
---@return string
function M.get_str(mode)
    if mode == 'n' or mode == 'normal' then
        return fn.expand('<cword>')
    elseif mode == 'v' or mode == 'visual' then
        api.nvim_input('<ESC>')
        return M.get_select()
    elseif mode == 'input' then
        return fn.expand('<cword>')
    else
        error('Unsupported mode' .. mode)
    end
end

function M.is_English(str)
    local char = { str:byte(1, -1) }
    for i = 1, #str do
        if char[i] > 128 then
            return false
        end
    end
    return true
end

return M