local socket = require("socket")
local ltn12 = require("ltn12")
local mime = require("mime")

dofile("testsupport.lua")

local qptest = "qptest.bin"
local eqptest = "qptest.bin2"
local dqptest = "qptest.bin3"

local b64test = "luasocket.dll"
local eb64test = "b64test.bin"
local db64test = "b64test.bin2"

-- make sure test file exists
local f = assert(io.open(b64test, "r"))
f:close()

-- from Machado de Assis, "A Mão e a Rosa"
local mao = [[
    Cursavam estes dois moços a academia de S. Paulo, estando 
    Luís Alves no quarto ano e Estêvão no terceiro. 
    Conheceram-se na academia, e ficaram amigos íntimos, tanto
    quanto podiam sê-lo dois espíritos diferentes, ou talvez por 
    isso mesmo que o eram. Estêvão, dotado de extrema
    sensibilidade, e não menor fraqueza de ânimo, afetuoso e
    bom, não daquela bondade varonil, que é apanágio de uma alma
    forte, mas dessa outra bondade mole e de cera, que vai à
    mercê de todas as circunstâncias, tinha, além de tudo isso, 
    o infortúnio de trazer ainda sobre o nariz os óculos 
    cor-de-rosa de suas virginais ilusões. Luís Alves via bem
    com os olhos da cara. Não era mau rapaz, mas tinha o seu
    grão de egoísmo, e se não era incapaz de afeições, sabia
    regê-las, moderá-las, e sobretudo guiá-las ao seu próprio
    interesse.  Entre estes dois homens travara-se amizade
    íntima, nascida para um na simpatia, para outro no costume.
    Eram eles os naturais confidentes um do outro, com a
    diferença que Luís Alves dava menos do que recebia, e, ainda
    assim, nem tudo o que dava exprimia grande confiança.
]]

local function random(handle, io_err)
    if handle then
        return function()
            local len = math.random(0, 1024)
            local chunk = handle:read(len)
            if not chunk then handle:close() end
            return chunk
        end
    else return ltn12.source.empty(io_err or "unable to open file") end
end

local function format(chunk)
    if chunk then
        if chunk == "" then return "''"
        else return string.len(chunk) end
    else return "nil" end
end

local function show(name, input, output)
    local sin = format(input)
    local sout = format(output)
    io.write(name, ": ", sin, " -> ", sout, "\n")
end

local function chunked(length)
    local tmp
    return function(chunk)
        local ret
        if chunk and chunk ~= "" then
            tmp = chunk
        end
        ret = string.sub(tmp, 1, length)
        tmp = string.sub(tmp, length+1)
        if not chunk and ret == "" then ret = nil end
        return ret
    end
end

--[[
local function named(f, name)
    return function(chunk)
        local ret = f(chunk)
        show(name, chunk, ret)
        return ret
    end
end
]]
local function named(f)
    return f
end

local what = nil
local function transform(input, output, filter)
    local source = random(io.open(input, "rb"))
    local sink = ltn12.sink.file(io.open(output, "wb"))
    if what then 
        sink = ltn12.sink.chain(filter, sink)
    else
        source = ltn12.source.chain(source, filter)
    end
    --what = not what
    ltn12.pump.all(source, sink)
end

local function encode_qptest(mode)
    local encode = mime.encode("quoted-printable", mode)
    local split = mime.wrap("quoted-printable")
    local chain = ltn12.filter.chain(encode, split)
    transform(qptest, eqptest, chain)
end

local function compare_qptest()
    compare(qptest, dqptest)
end

local function decode_qptest()
    local decode = mime.decode("quoted-printable")
    transform(eqptest, dqptest, decode)
end

local function create_qptest()
    local f, err = io.open(qptest, "wb")
    if not f then fail(err) end
    -- try all characters
    for i = 0, 255 do
        f:write(string.char(i))
    end
    -- try all characters and different line sizes
    for i = 0, 255 do
        for j = 0, i do
            f:write(string.char(i))
        end
        f:write("\r\n")
    end
    -- test latin text
    f:write(mao)
    -- force soft line breaks and treatment of space/tab in end of line
    local tab
    f:write(string.gsub(mao, "(%s)", function(c)
        if tab then
            tab = nil
            return "\t"
        else
            tab = 1
            return " "
        end
    end))
    -- test crazy end of line conventions
    local eol = { "\r\n", "\r", "\n", "\n\r" }
    local which = 0
    f:write(string.gsub(mao, "(\n)", function(c)
        which = which + 1
        if which > 4 then which = 1 end
        return eol[which]
    end))
    for i = 1, 4 do
        for j = 1, 4 do
            f:write(eol[i])
            f:write(eol[j])
        end
    end
    -- try long spaced and tabbed lines
    f:write("\r\n")
    for i = 0, 255 do
        f:write(string.char(9))
    end
    f:write("\r\n")
    for i = 0, 255 do
        f:write(' ')
    end
    f:write("\r\n")
    for i = 0, 255 do
        f:write(string.char(9),' ')
    end
    f:write("\r\n")
    for i = 0, 255 do
        f:write(' ',string.char(32))
    end
    f:write("\r\n")
    
    f:close()
end

local function cleanup_qptest()
    os.remove(qptest)
    os.remove(eqptest)
    os.remove(dqptest)
end

local function encode_b64test()
    local e1 = mime.encode("base64")
    local e2 = mime.encode("base64")
    local e3 = mime.encode("base64")
    local e4 = mime.encode("base64")
    local sp4 = mime.wrap()
    local sp3 = mime.wrap(59)
    local sp2 = mime.wrap("base64", 30)
    local sp1 = mime.wrap(27)
    local chain = ltn12.filter.chain(e1, sp1, e2, sp2, e3, sp3, e4, sp4)
    chain = socket.protect(chain)
    transform(b64test, eb64test, chain)
end

local function decode_b64test()
    local d1 = named(mime.decode("base64"), "d1")
    local d2 = named(mime.decode("base64"), "d2")
    local d3 = named(mime.decode("base64"), "d3")
    local d4 = named(mime.decode("base64"), "d4")
    local chain = named(ltn12.filter.chain(d1, d2, d3, d4), "chain")
    transform(eb64test, db64test, chain)
end

local function cleanup_b64test()
    os.remove(eb64test)
    os.remove(db64test)
end

local function compare_b64test()
    compare(b64test, db64test)
end

local function identity_test()
    local chain = ltn12.filter.chain(
        mime.encode("quoted-printable"),
        mime.encode("base64"),
        mime.decode("base64"),
        mime.decode("quoted-printable")
    )
    transform(b64test, eb64test, chain)
    compare(b64test, eb64test)
    os.remove(eb64test)
end


local function padcheck(original, encoded)
    local e = (mime.b64(original))
    local d = (mime.unb64(encoded))
    if e ~= encoded then fail("encoding failed") end
    if d ~= original then fail("decoding failed") end
end

local function chunkcheck(original, encoded)
    local len = string.len(original)
    for i = 0, len do
        local a = string.sub(original, 1, i)
        local b = string.sub(original, i+1)
        local e, r = mime.b64(a, b)
        local f = (mime.b64(r))
        if (e .. f ~= encoded) then fail(e .. f) end
    end
end

local function padding_b64test()
    padcheck("a", "YQ==")
    padcheck("ab", "YWI=")
    padcheck("abc", "YWJj")
    padcheck("abcd", "YWJjZA==")
    padcheck("abcde", "YWJjZGU=")
    padcheck("abcdef", "YWJjZGVm")
    padcheck("abcdefg", "YWJjZGVmZw==")
    padcheck("abcdefgh", "YWJjZGVmZ2g=")
    padcheck("abcdefghi", "YWJjZGVmZ2hp")
    padcheck("abcdefghij", "YWJjZGVmZ2hpag==")
    chunkcheck("abcdefgh", "YWJjZGVmZ2g=")
    chunkcheck("abcdefghi", "YWJjZGVmZ2hp")
    chunkcheck("abcdefghij", "YWJjZGVmZ2hpag==")
    print("ok")
end

local t = socket.gettime()

identity_test()
encode_b64test()
decode_b64test()
compare_b64test()
cleanup_b64test()
padding_b64test()

create_qptest()
encode_qptest()
decode_qptest()
compare_qptest()
encode_qptest("binary")
decode_qptest()
compare_qptest()
cleanup_qptest()

print(string.format("done in %.2fs", socket.gettime() - t))