--no need to understand this for the beginning.
--this script spawns the start unit from sidedata.lua for each player

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--
--  file:    game_spawn.lua
--  brief:   spawns start unit and sets storage levels
--  author:  Tobi Vollebregt
--
--  Copyright (C) 2010.
--  Licensed under the terms of the GNU GPL, v2 or later.
--
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

function gadget:GetInfo()
    return {
        name      = "Spawn",
        desc      = "spawns start unit and sets storage levels",
        author    = "Tobi Vollebregt",
        date      = "January, 2010",
        license   = "GNU GPL, v2 or later",
        layer     = 0,
        enabled   = true  --  loaded by default?
    }
end

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-- synced only
if (not gadgetHandler:IsSyncedCode()) then
    return false
end

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--------------------------------------------------------------------------------

local modOptions = Spring.GetModOptions()

function IsTeamAI(teamID)
teamID,leader,isDead,isAiTeam=Spring.GetTeamInfo(teamID)
return isAiTeam
end

local function GetStartUnit(teamID)
    -- get the team startup info
    local side = select(5, Spring.GetTeamInfo(teamID))
    local startUnit

    boolIsAI= IsTeamAI(teamID)

        if boolIsAI==true then
        local sidedata = Spring.GetSideData()
        startUnit =sidedata.startunitai
        return startUnit
        end

    if (side == "") then
        -- startscript didn't specify a side for this team
        local sidedata = Spring.GetSideData()
        if (sidedata and #sidedata > 0) then
            startUnit = sidedata[1 + teamID % #sidedata].startUnit
        end
    else
        startUnit = Spring.GetSideData(side)
    end
    return startUnit
end

local function SpawnStartUnit(teamID)
    local startUnit = GetStartUnit(teamID)
    if (startUnit and startUnit ~= "") then
        -- spawn the specified start unit
        local x,y,z = Spring.GetTeamStartPosition(teamID)
        -- snap to 16x16 grid
        x, z = 16*math.floor((x+8)/16), 16*math.floor((z+8)/16)
        y = Spring.GetGroundHeight(x, z)
        -- facing toward map center
        local facing=math.abs(Game.mapSizeX/2 - x) > math.abs(Game.mapSizeZ/2 - z)
            and ((x>Game.mapSizeX/2) and "west" or "east")
            or ((z>Game.mapSizeZ/2) and "north" or "south")
        local unitID = Spring.CreateUnit(startUnit, x, y, z, facing, teamID)
         if startUnit=="citadell" then

         id1=Spring.CreateUnit("contruck", x+100, y+200, z, facing, teamID)
         id2=Spring.CreateUnit("contruck", x+100, y+200, z+50, facing, teamID)
         id3=Spring.CreateUnit("contruck", x+100, y+200, z-50, facing, teamID)
         Spring.CreateUnit("ccittadeldecal", x, y, z, 0, teamID)
         Spring.CreateUnit("cbuildanimation",x,y,z,0,teamID)

         Spring.GiveOrderToUnit(id1,CMD.GUARD,{unitID}, {"shift"})
         Spring.GiveOrderToUnit(id2,CMD.GUARD,{unitID}, {"shift"})
         Spring.GiveOrderToUnit(id3,CMD.GUARD,{unitID}, {"shift"})


         else

         id1=Spring.CreateUnit("conbigfoot", x+100, y, z+50, facing, teamID)
         id2=Spring.CreateUnit("conbigfoot", x+100, y, z, facing, teamID)
         id3=Spring.CreateUnit("conbigfoot", x+100, y, z-50, facing, teamID)

         Spring.GiveOrderToUnit(id1,CMD.GUARD,{unitID}, {"shift"})
         Spring.GiveOrderToUnit(id2,CMD.GUARD,{unitID}, {"shift"})
         Spring.GiveOrderToUnit(id3,CMD.GUARD,{unitID}, {"shift"})

         end
    end

    -- set start resources, either from mod options or custom team keys
    local teamOptions = select(7, Spring.GetTeamInfo(teamID))
    local m = teamOptions.startmetal  or modOptions.startmetal  or 1500
    local e = teamOptions.startenergy or modOptions.startenergy or 1500

    -- using SetTeamResource to get rid of any existing resource without affecting stats
    -- using AddTeamResource to add starting resource and counting it as income
    if (m and tonumber(m) ~= 0) then
        -- remove the pre-existing storage
        --   must be done after the start unit is spawned,
        --   otherwise the starting resources are lost!
        Spring.SetTeamResource(teamID, "ms", tonumber(m))
        Spring.SetTeamResource(teamID, "m", 0)
        Spring.AddTeamResource(teamID, "m", tonumber(m))
    end
    if (e and tonumber(e) ~= 0) then
        -- remove the pre-existing storage
        --   must be done after the start unit is spawned,
        --   otherwise the starting resources are lost!
        Spring.SetTeamResource(teamID, "es", tonumber(e))
        Spring.SetTeamResource(teamID, "e", 0)
        Spring.AddTeamResource(teamID, "e", tonumber(e))
    end
end


function gadget:GameStart()
    -- only activate if engine didn't already spawn units (compatibility)
    if (#Spring.GetAllUnits() > 0) then
        return
    end

    -- spawn start units
    local gaiaTeamID = Spring.GetGaiaTeamID()
    local teams = Spring.GetTeamList()
    for i = 1,#teams do
        local teamID = teams[i]
        -- don't spawn a start unit for the Gaia team
        if (teamID ~= gaiaTeamID) then
            SpawnStartUnit(teamID)
        end
    end
end