#include "pch.h"

#include "Triplet.h"
#include "vcpkg_Checks.h"
#include "vcpkg_Strings.h"

namespace vcpkg
{
    struct TripletInstance
    {
        TripletInstance(std::string&& s) : value(std::move(s)), hash(std::hash<std::string>()(value)) {}

        const std::string value;
        const size_t hash = 0;

        bool operator==(const TripletInstance& o) const { return o.value == value; }
    };
    const TripletInstance Triplet::default_instance({});
}

template<>
struct std::hash<vcpkg::TripletInstance>
{
    size_t operator()(const vcpkg::TripletInstance& t) const { return t.hash; }
};

namespace vcpkg
{
    static std::unordered_set<TripletInstance> g_triplet_instances;

    const Triplet Triplet::X86_WINDOWS = from_canonical_name("x86-windows");
    const Triplet Triplet::X64_WINDOWS = from_canonical_name("x64-windows");
    const Triplet Triplet::X86_UWP = from_canonical_name("x86-uwp");
    const Triplet Triplet::X64_UWP = from_canonical_name("x64-uwp");
    const Triplet Triplet::ARM_UWP = from_canonical_name("arm-uwp");

    bool Triplet::operator==(const Triplet& other) const { return this->m_instance == other.m_instance; }

    bool operator!=(const Triplet& left, const Triplet& right) { return !(left == right); }

    Triplet Triplet::from_canonical_name(const std::string& triplet_as_string)
    {
        std::string s(Strings::ascii_to_lowercase(triplet_as_string));
        auto it = std::find(s.cbegin(), s.cend(), '-');
        Checks::check_exit(VCPKG_LINE_INFO, it != s.cend(), "Invalid triplet: %s", triplet_as_string);

        auto p = g_triplet_instances.emplace(std::move(s));
        return &*p.first;
    }

    const std::string& Triplet::canonical_name() const { return this->m_instance->value; }

    const std::string& Triplet::to_string() const { return this->canonical_name(); }
    size_t Triplet::hash_code() const { return m_instance->hash; }
}