SmartyQuarryDB

local database = {}
local Coords = {}
local isPosSaved = true

--returns xCoord as int
function database.GetXCoord()
    if(Coords.xCoord == nil) then
        printError("x co-ordinate is nil, did you run PopulateDB first?")
    end
    return Coords.xCoord
end

function database.SetXCoord(xCoord)
    if(Coords.xCoord == nil) then
        printError("x co-ordinate is nil, did you run PopulateDB first?")
        return
    end
    Coords.xCoord = xCoord
    database.StorePosition()
end

--returns yCoord as int
function database.GetYCoord()
    if(Coords.yCoord == nil) then
        printError("y co-ordinate is nil, did you run PopulateDB first?")
    end
    return Coords.yCoord
end

function database.SetYCoord(yCoord)
    if(Coords.yCoord == nil) then
        printError("y co-ordinate is nil, did you run PopulateDB first?")
        return
    end
    Coords.yCoord = yCoord
    database.StorePosition()
end

--returns zCoord as int
function database.GetZCoord()
    if(Coords.zCoord == nil) then
        printError("z co-ordinate is nil, did you run PopulateDB first?")
    end
    return Coords.zCoord
end

function database.SetZCoord(zCoord)
    if(Coords.zCoord == nil) then
        printError("z co-ordinate is nil, did you run PopulateDB first?")
        return
    end
    Coords.zCoord = zCoord
    database.StorePosition()
end

--function returns table of x,y,z coordinates indexed by xCoord, yCoord, and zCoord
function database.GetCoords()
    if(Coords.xCoord == nil or Coords.y == nil or Coords.z == nil ) then
        printError("one or more co-ordinates in the table are nil, did you run PopulateDB first?")
    end
    return Coords
end

--reads from the position.txt file and saves the coordinates, creates the position file at /home/smart_quarry/database/position.txt
--returns true if succeeds and false if fails, prints error messages to console
function database.PopulateDB()
    local pos = fs.open("smart_quarry/database/position.txt","r")
    local dbPopulatedCorrectly = true

    if(pos == nil) then
        printError("position.txt file does not exist, creating one now at home/smart_quarry/database/position.txt, please add turtle start position to file with co-ordinate on a seperate line. It goes in order x, y, z. only the co-ordinates should be present no letters")
        isPosSaved = false
        pos = fs.open("smart_quarry/database/position.txt","w")
        dbPopulatedCorrectly = false
        return dbPopulatedCorrectly
    end

    local x = pos.readLine()
    local y = pos.readLine()
    local z = pos.readLine()

    if(x == nil) then
        printError("x value nil, check position.txt file for syntax errors")
        dbPopulatedCorrectly = false
    end

    if(y == nil) then
        printError("y value nil, check position.txt file for syntax errors")
        dbPopulatedCorrectly = false
    end

    if(z == nil) then
        printError("z value nil, check position.txt file for syntax errors")
        dbPopulatedCorrectly = false
    end

    if(dbPopulatedCorrectly) then
        Coords.xCoord = tonumber(x)
        Coords.yCoord = tonumber(y)
        Coords.zCoord = tonumber(z)
    end

    pos.close()
    return dbPopulatedCorrectly
end

--Writes the positions to the position.txt file in /home/smart_quarry/database/position.txt
--This is necessary to properly save the database values
function database.StorePosition()
    local pos = fs.open("/smart_quarry/database/position.txt","w")
    pos.writeLine(Coords.xCoord)
    pos.writeLine(Coords.yCoord)
    pos.writeLine(Coords.zCoord)
    pos.close()
end

--Updates positions in database for x y and z Coords, takes 3 seperate integer values for x,y,z coordinates respectively
function database.UpdatePosition(xCoord, yCoord, zCoord)
    Coords.xCoord = xCoord
    Coords.yCoord = yCoord
    Coords.zCoord = zCoord
end


return database