-- Sum of the last 7 days' expenses (rolling window).

local lang = jarvis.context.language
local raw_state = jarvis.state.get("entries") or ""
if raw_state == "" then
    return jarvis.cmd.not_found(lang == "ru"
        and "На этой неделе ничего не тратили."
        or  "Nothing logged this week.")
end

local now = jarvis.context.time
local now_ts = os.time({
    year = now.year, month = now.month, day = now.day,
    hour = now.hour, min = now.minute, sec = now.second or 0,
})
local cutoff = now_ts - 7 * 86400

local total = 0
local count = 0
for chunk in raw_state:gmatch("([^|]+)") do
    local ts, am = chunk:match("^(%d+),([%-%d%.]+),")
    ts = tonumber(ts); am = tonumber(am)
    if ts and am and ts >= cutoff then
        total = total + am
        count = count + 1
    end
end

if total == 0 then
    return jarvis.cmd.ok(lang == "ru"
        and "На этой неделе тратами не похваляешься, сэр."
        or  "Nothing tracked this week, sir.")
end

return jarvis.cmd.ok(string.format(lang == "ru"
    and "За неделю %d трат на сумму %.0f."
    or  "This week: %d expenses totalling %.0f.", count, total))