local istream = require("InputStream")
local ds = require("DataStructures")
local Stack, Dictionary, WordInfo, Environment = ds.Stack, ds.Dictionary, ds.WordInfo, ds.Environment


function pushThree(s)
   s:push(1)
   s:push(2)
   s:push(3)
end


describe("Stack Tests", function()
   local stack = Stack:new()
   it("fails on stack underflow", function()
      stack = Stack:new()
      assert.has.errors(function()
         stack:pop()
      end)
   end)
   it("pushes three items properly", function()
      stack = Stack:new()
      pushThree(stack)
      assert.are.same(stack.contents, {1,2,3})
   end)
   it("pops three items properly", function()
      stack = Stack:new()
      pushThree(stack)
      assert.are.same(stack.contents, {1,2,3})
      assert(3 == stack:pop())
      assert.are.same(stack.contents, {1,2})
      assert(2 == stack:pop())
      assert.are.same(stack.contents, {1})
      assert(1 == stack:pop())
      assert.are.same(stack.contents, {})
      assert.has.errors(function()
         stack:pop()
      end)
   end)
   it("PUSH 1, 2, 3, POP = 3, PUSH 4 = {1,2,4}", function()
      stack = Stack:new()
      pushThree(stack)
      assert(3 == stack:pop())
      assert.are.same(stack.contents, {1, 2})
      stack:push(4)
      assert.are.same(stack.contents, {1, 2, 4})
   end)
end)

local function dummyInput()
   return "1234567890"
end
describe("InputStream tests", function()
   local input = istream:new(dummyInput)
   it("gets a new refill accurately", function()
      input = istream:new()
      input:setRefill(dummyInput)
      assert.are.equal(input.refill, dummyInput)
   end)
   it("reads text properly", function()
      input = istream:new(dummyInput)
      input:setRefill(dummyInput)
      local inputString = dummyInput()
      for i = 0, 100 do
         local j = i % #inputString + 1
         assert.are.same(inputString:sub(j, j), input:advanceOffset())
      end
   end)
end)
describe("WordInfo tests", function()
   local Environment = ds.Environment
   local WordInfo = ds.WordInfo
   it("creates and doesn't crash", function()
      local env = Environment:new()
      wi = WordInfo:new(function(env) end, false)
   end)
end)


describe("Dictionary tests", function()
   local Dictionary = ds.Dictionary
   local WordInfo = ds.WordInfo
   local Environment = ds.Environment
   it("defines without breaking",function()
      local env = Environment:new()
      local dict = Dictionary:new()
      local wi = WordInfo:new(function(env) end, false)

      dict:define("TEST",wi)
   end)
end)