require("parse")

-- TODO: This should really be a separate API and module
-- please break it out
-- Interpret some text
function interpret(content,uri,chain)
  -- LOCALS
  -- The pattern for words inbetween expressions
  local expressionWordPattern = "(.*)"
  -- The patterns to open and close expressions,
  -- the words scattered inbetween them will be matches 
  local expressionOpenPattern = "%("
  local expressionClosePattern = "%)"
  local subExpressionOpenPattern = "%:"
  local subExpressionClosePattern = "%,"
  local blockOpenPattern = "%{"
  local blockClosePattern = "%}"
  local blockDelimiterPattern = "[;]+"
  -- So that all functions have access to eachother
  local consume,
        consumeExpression,
        processWords,
        processClosure,
        processOpening,
        consumeBlock,
        consumeText,
        consumeNumber


  local consumer = Consumer(content)
  local function expression(...)
    return Expression(...):locate(
      string.format(
        "%i:%i",
        consumer.row,
        consumer.col
      ),uri)
  end
  local baseExpression = expression()

  -- FUNCTIONS
  -- Consume an expression, with its sub expressions
  -- given that an opening has just been consumed
  local singleLineStringPattern = "\""
  local function singleLineStringMeal(current,match)
    return function(words,_)
      current:insert(words,consumer:consume({
        [match] = function(words,_)
          return expression({"text",Expression({words})})
        end
      }))
    end
  end
  local multiLineStringOpenPattern = "%[%["
  local multiLineStringClosePattern = "%]%]"
  local function multiLineStringMeal(current,match)
    return function(words,_)
      current:insert(words,consumer:consume({
        ["[\n\r]"] = function()
          error("Incomplete string literal")
        end,
        [match] = function(words,_)
          return expression({"text",Expression({words})})
        end
      }))
    end
  end
  local uriOpenPattern = "<"
  local uriClosePattern = ">"
  local function URIMeal(current,match)
    return function(words,_)
      current:insert(words,consumer:consume({
        ["[\n\r]"] = function()
          current:error("Incomplete URI literal")
        end,
        [match] = function(path)
          return read(path)
        end
      }))
    end
  end
  local function expressionMeal(current)
    return function(words,_) 
      current:insert(words,consumeExpression())
    end
  end
  function consumeBlock()
    local expressions = {}
    local current = expression()
    local loop = true
    while loop do
      local expr = consumer:consume({
        [uriOpenPattern] = URIMeal(current,uriClosePattern),
        [expressionOpenPattern] = expressionMeal(current),
        [multiLineStringOpenPattern] = 
          multiLineStringMeal(
            current,multiLineStringClosePattern),
        [singleLineStringPattern] = 
          singleLineStringMeal(
            current,singleLineStringPattern),
        [blockDelimiterPattern] = function(words,_)
          if current:empty() then
            error("Extravenous semicolon.")
          end
          table.insert(expressions,current)
          current = expression()
        end,
        [blockClosePattern] = function(words,_)
          current:insert(words)
          loop = false
        end
      })
    end
    if #current.items ~= 0 then
      table.insert(expressions,current)
    end
    return expression(expressions)
  end
  function consumeExpression()
    local current = expression()
    -- Loop, adding new expressions and words,
    -- until closing that is
    local loop = true
    while loop do
      local remaining = consumer:remaining()
      local expr = consumer:consume({
        [uriOpenPattern] = URIMeal(current,uriClosePattern),
        [expressionOpenPattern] = expressionMeal(current),
        [multiLineStringOpenPattern] = 
          multiLineStringMeal(
            current,multiLineStringClosePattern),
        [singleLineStringPattern] = 
          singleLineStringMeal(
            current,singleLineStringPattern),
        [expressionOpenPattern] = expressionMeal(current),
        [expressionClosePattern] = function(words,_)
          current:insert(words)
          loop = false
        end,
        [blockOpenPattern] = function(words,_)
          current:insert(
            words,
            consumeBlock()
          )
        end,
        ["$"] = function(words,last)
          current:insert(remaining)
          loop = false
        end
      })
      -- This single line below made me procrastinate life for a total of 4 hours on instagram reels; lock in.
      -- if not expr then print("brk") break end -- Since now closing
    end
    return current
  end
  return consumeExpression()
  -- TODO: check for later expressions please?
end

return _G