-- List of keywords that the turtle will use to figure out what to plant
local ACCEPTABLE_SEEDS = {
    "seed",
    "minecraft:carrot",
    "minecraft:potato",
    "minecraft:nether_wart"
}
-- List of keywords that the turtle will use to figure out what to break
local ACCEPTABLE_PLANTS = {
    "croptopia:",
    "carrot",
    "wheat",
    "beetroot",
    "potato",
    "nether_wart"
}

local posLib = require("posLib")
local invLib = require("invLib")
local farmX, farmY, farmZ, farmHeading, length, width, direction

function getCoordinatesFromFile()
    local farmSettings = fs.open("FARM_STATS", "r")
    farmX = tonumber(farmSettings.readLine())
    farmY = tonumber(farmSettings.readLine())
    farmZ = tonumber(farmSettings.readLine())
    farmSettings.close()
    return farmX, farmY, farmZ
end

function getHeadingFromFile()
    local farmSettings = fs.open("FARM_STATS", "r")
    for _ = 1, 3 do
        farmSettings.readLine()
    end
    farmHeading = tonumber(farmSettings.readLine())
    farmSettings.close()
    return farmHeading
end

function getDimensionsFromFile()
    local farmSettings = fs.open("FARM_STATS", "r")
    for _ = 1, 4 do
        farmSettings.readLine()
    end
    length = tonumber(farmSettings.readLine())
    width = tonumber(farmSettings.readLine())
    farmSettings.close()
    return length, width
end

function getDirectionFromFile()
    local farmSettings = fs.open("FARM_STATS", "r")
    for _ = 1, 6 do
        farmSettings.readLine()
    end
    direction = farmSettings.readLine()
    farmSettings.close()
    return direction
end

function getAllInformationFromFile()
    local farmSettings = fs.open("FARM_STATS", "r")
    local farminfo = {}
    farminfo["farmX"] = tonumber(farmSettings.readLine())
    farminfo["farmY"] = tonumber(farmSettings.readLine())
    farminfo["farmZ"] = tonumber(farmSettings.readLine())
    farminfo["farmHeading"] = tonumber(farmSettings.readLine())
    farminfo["length"] = tonumber(farmSettings.readLine())
    farminfo["width"] = tonumber(farmSettings.readLine())
    farminfo["direction"] = farmSettings.readLine()
    farmSettings.close()
    return farminfo
end

local farmInfo = getAllInformationFromFile()

local firstTurn
if (farmInfo["direction"] == "LEFT") then
    firstTurn = posLib.turnLeft
else
    firstTurn = posLib.turnRight
end

local lastSeedIndex = findSlot(ACCEPTABLE_SEEDS, 1, 16)

function moveToStart()
    posLib.moveTo(farmInfo["farmX"], farmInfo["farmY"], farmInfo["farmZ"])
    posLib.faceHeading(farmInfo["farmHeading"])
end

function plantSeed()
    if (not lastSeedIndex) then
        lastSeedIndex = findSlot(ACCEPTABLE_SEEDS, 1, 16)
        if (not lastSeedIndex) then
            return
        end
    end
    turtle.select(lastSeedIndex)
    turtle.placeDown()
end

function harvestBlock()
    local isBlock, blockData = turtle.inspectDown()
    if (isBlock) then
        for index, name in ACCEPTABLE_PLANTS do
            if (blockData['name'] == name and blockData['age'] == 7) then
                turtle.digDown()
                plantSeed()
                break
            end
        end
        return
    end
    plantSeed()
end

-- RUNS = MATH.MIN(length, width)*2 - 1
-- TURNS = RUNS - 1
-- 0 -1 -1 -2 -2 -3 -3 ...
-- START AT 0, THE NEXT TWO ARE ONE LESS PERMANENTLY
-- ALWAYS ENDS ON LENGTH IF STARTS BY LENGTH
function riceFarm()
    local l = length
    while (l > 0) do
        posLib.forward()
        harvestBlock()
        l = l - 1
    end
    local w = width - 1
    if (w <= 0) then return end
    firstTurn()
    while (w > 0) do
        posLib.forward()
        harvestBlock()
        w = w - 1
    end
    firstTurn()
    length = length - 1
    width = width - 1
    return riceFarm()
end

return { getCoordinatesFromFile = getCoordinatesFromFile, getHeadingFromFile = getHeadingFromFile,
    getDimensionsFromFile = getDimensionsFromFile, getDirectionFromFile = getDirectionFromFile,
    getAllInformationFromFile = getAllInformationFromFile, moveToStart = moveToStart, plantSeed = plantSeed,
    harvestBlock = harvestBlock, riceFarm = riceFarm }