-- interest.lua (Nutzt die neue, dedizierte API-Funktion)

-- KONFIGURATION
local BALANCE_INTEREST_RATE = 0.005
local CREDIT_INTEREST_RATE = 0.03
local INTEREST_CHECK_INTERVAL = 600
local ONE_DAY_IN_SECONDS = 86400

local timestamp_file_path = minetest.get_worldpath() .. "/bank_interest_timestamp.txt"

local function read_timestamp() local f = io.open(timestamp_file_path, "r"); if not f then return 0 end; local time = tonumber(f:read("*a")); f:close(); return time or 0 end
local function write_timestamp(time) local f = io.open(timestamp_file_path, "w"); if not f then return end; f:write(tostring(time)); f:close() end

local time_since_last_check = 0
bank_accounts.is_calculating_interest = false

minetest.register_globalstep(function(dtime)
    time_since_last_check = time_since_last_check + dtime
    if time_since_last_check < INTEREST_CHECK_INTERVAL then return end
    time_since_last_check = 0
    
    local last_timestamp = read_timestamp()
    
    if os.time() - last_timestamp >= ONE_DAY_IN_SECONDS then
        if bank_accounts.is_calculating_interest then return end
        minetest.log("action", "[bank_accounts] Starting daily interest calculation...")
        bank_accounts.is_calculating_interest = true

        -- KORREKTUR: Nutzt die neue, dedizierte Funktion
        local data = bank_accounts.get_all_data()
        local changes_made = false
        
        -- Zinsen auf Guthaben
        if BALANCE_INTEREST_RATE > 0 then
            for player_name, balance in pairs(data.balance) do
                if balance > 0 then
                    local interest = balance * BALANCE_INTEREST_RATE
                    data.balance[player_name] = balance + interest
                    if not data.history then data.history = {} end; if not data.history[player_name] then data.history[player_name] = {} end
                    table.insert(data.history[player_name], 1, { timestamp = os.time(), type = "Interest Paid", account = "balance", amount = interest, new_total = data.balance[player_name], desc = S("Daily interest (@1%)", BALANCE_INTEREST_RATE * 100), other = "Bank" })
                    changes_made = true
                end
            end
        end

        -- Zinsen auf Kredit
        if CREDIT_INTEREST_RATE > 0 then
            for player_name, credit in pairs(data.credit) do
                if credit > 0 then
                    local interest = credit * CREDIT_INTEREST_RATE
                    data.credit[player_name] = credit + interest
                    if not data.history then data.history = {} end; if not data.history[player_name] then data.history[player_name] = {} end
                    table.insert(data.history[player_name], 1, { timestamp = os.time(), type = "Interest Charged", account = "credit", amount = interest, new_total = data.credit[player_name], desc = S("Daily interest (@1%)", CREDIT_INTEREST_RATE * 100), other = "Bank" })
                    changes_made = true
                end
            end
        end

        if changes_made then
            bank_accounts.save_all(data)
            minetest.log("action", "[bank_accounts] Daily interest calculation complete.")
        end
        
        write_timestamp(os.time())
        bank_accounts.is_calculating_interest = false
    end
end)