From 90021e1d335efac1017562c1d5dee43e99580319 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Wed, 22 Jul 2020 22:13:33 +0200
Subject: Local and shared state

---
 src/state.cpp | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 src/state.cpp

(limited to 'src/state.cpp')

diff --git a/src/state.cpp b/src/state.cpp
new file mode 100644
index 0000000..8790dfc
--- /dev/null
+++ b/src/state.cpp
@@ -0,0 +1,127 @@
+#include "state.h"
+
+#include "identity.h"
+
+using namespace erebos;
+
+using std::make_shared;
+
+const UUID LocalState::headTypeId { "1d7491a9-7bcb-4eaa-8f13-c8c4c4087e4e" };
+
+LocalState::LocalState():
+	p(make_shared<Priv>())
+{}
+
+LocalState::LocalState(const Ref & ref):
+	LocalState()
+{
+	auto rec = ref->asRecord();
+	if (!rec)
+		return;
+
+	if (auto x = rec->item("id").asRef())
+		p->identity = Identity::load(*x);
+
+	for (auto i : rec->items("shared"))
+		if (const auto & x = i.as<SharedState>())
+			p->shared.push_back(*x);
+}
+
+Ref LocalState::store(const Storage & st) const
+{
+	vector<Record::Item> items;
+
+	if (p->identity)
+		items.emplace_back("id", *p->identity->ref());
+	for (const auto & x : p->shared)
+		items.emplace_back("shared", x);
+
+	return st.storeObject(Record(std::move(items)));
+}
+
+const optional<Identity> & LocalState::identity() const
+{
+	return p->identity;
+}
+
+LocalState LocalState::identity(const Identity & id) const
+{
+	LocalState ret;
+	ret.p->identity = id;
+	ret.p->shared = p->shared;
+	return ret;
+}
+
+vector<Ref> LocalState::lookupShared(UUID type) const
+{
+	vector<Stored<SharedState>> found;
+	vector<Stored<SharedState>> process = p->shared;
+
+	while (!process.empty()) {
+		auto cur = std::move(process.back());
+		process.pop_back();
+
+		if (cur->type == type) {
+			found.push_back(std::move(cur));
+			continue;
+		}
+
+		for (const auto & x : cur->prev)
+			process.push_back(x);
+	}
+
+	filterAncestors(found);
+	vector<Ref> res;
+	for (const auto & s : found)
+		for (const auto & v : s->value)
+			res.push_back(v);
+	return res;
+}
+
+LocalState LocalState::updateShared(UUID type, const vector<Ref> & xs) const
+{
+	const Storage * st;
+	if (xs.size() > 0)
+		st = &xs[0].storage();
+	else if (p->shared.size() > 0)
+		st = &p->shared[0].ref().storage();
+	else
+		return *this;
+
+	LocalState ret;
+	ret.p->identity = p->identity;
+	ret.p->shared.push_back(SharedState(p->shared, type, xs).store(*st));
+	return ret;
+}
+
+
+SharedState::SharedState(const Ref & ref)
+{
+	auto rec = ref->asRecord();
+	if (!rec)
+		return;
+
+	for (auto i : rec->items("PREV"))
+		if (const auto & x = i.as<SharedState>())
+			prev.push_back(*x);
+
+	if (auto x = rec->item("type").asUUID())
+		type = *x;
+
+	for (auto i : rec->items("value"))
+		if (const auto & x = i.asRef())
+			value.push_back(*x);
+}
+
+Ref SharedState::store(const Storage & st) const
+{
+	vector<Record::Item> items;
+
+	for (const auto & x : prev)
+		items.emplace_back("PREV", x);
+	items.emplace_back("type", type);
+	for (const auto & x : value)
+		items.emplace_back("value", x);
+
+	return st.storeObject(Record(std::move(items)));
+}
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