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#include "sim/power/mathexpr_powermodel.hh"

#include <string>

#include "base/statistics.hh"
#include "params/MathExprPowerModel.hh"
#include "sim/mathexpr.hh"
#include "sim/power/thermal_model.hh"
#include "sim/sim_object.hh"

namespace gem5
{

MathExprPowerModel::MathExprPowerModel(const Params &p)
    : PowerModelState(p), dyn_expr(p.dyn), st_expr(p.st)
{
}

void
MathExprPowerModel::startup()
{
    for (auto expr: {dyn_expr, st_expr}) {
        std::vector<std::string> vars = expr.getVariables();

        for (auto var: vars) {
            // Automatic variables:
            if (var == "temp" || var == "voltage" || var == "clock_period") {
                continue;
            }

            auto *info = statistics::resolve(var);
            fatal_if(!info, "Failed to evaluate %s in expression:\n%s\n",
                     var, expr.toStr());
            statsMap[var] = info;
        }
    }
}

double
MathExprPowerModel::eval(const MathExpr &expr) const
{
    return expr.eval(
        std::bind(&MathExprPowerModel::getStatValue,
                  this, std::placeholders::_1)
        );
}

double
MathExprPowerModel::getStatValue(const std::string &name) const
{
    using namespace statistics;

    // Automatic variables:
    if (name == "temp") {
        return _temp.toCelsius();
    } else if (name == "voltage") {
        return clocked_object->voltage();
    } else if (name=="clock_period") {
        return clocked_object->clockPeriod();
    }

    const auto it = statsMap.find(name);
    assert(it != statsMap.cend());
    const Info *info = it->second;

    // Try to cast the stat, only these are supported right now
    auto si = dynamic_cast<const ScalarInfo *>(info);
    if (si)
        return si->value();
    auto fi = dynamic_cast<const FormulaInfo *>(info);
    if (fi)
        return fi->total();

    panic("Unknown stat type!\n");
}

void
MathExprPowerModel::regStats()
{
    PowerModelState::regStats();
}

} // namespace gem5