#pragma once
#include <vector>
#include <span>
#include <string>
#include "raid/core/types.hpp"
#include "raid/core/error.hpp"

namespace raid {

/// Columnar time series: strictly increasing timestamps and one double per observation.
struct TimeSeries {
  std::string id;
  std::vector<Timestamp> t;
  std::vector<f64> v;
  usize size() const { return v.size(); }
  bool empty() const { return v.empty(); }
  void validate() const {
    RAID_REQUIRE(t.size() == v.size(), invalid_argument, "TimeSeries: t/v size mismatch");
    for (usize i = 1; i < t.size(); ++i) RAID_REQUIRE(t[i] > t[i - 1], data_quality, "TimeSeries: timestamps not strictly increasing at index " + std::to_string(i));
  }
  std::span<const f64> values() const { return v; }
};

}  // namespace raid