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#include "build.h"

#include <future>
#include <vector>
#include <iostream>
#include <chrono>
#include <set>
#include <thread>

#include "tasks.h"

using namespace std::chrono_literals;

int build(const Settings& settings,
          const std::string& name,
          const std::list<std::shared_ptr<Task>>& tasks,
          const std::list<std::shared_ptr<Task>>& all_tasks)
{
	if(settings.verbose > 1)
	{
		std::cout << "Building '" << name << "'\n";
	}

	std::list<std::shared_ptr<Task>> dirtyTasks;
	for(auto task : tasks)
	{
		if(task->dirty())
		{
			dirtyTasks.push_back(task);
		}
	}

	if(dirtyTasks.empty())
	{
		std::cout << "Nothing to be done for '"<< name << "'\n";
		return 0;
	}

	std::list<std::future<int>> processes;

	// Start all tasks
	bool done{false};
	while(!done)
	{
		bool started_one{false};
		while(processes.size() < settings.parallel_processes)
		{
			if(dirtyTasks.empty())
			{
				done = true;
				break;
			}

			auto task = getNextTask(all_tasks, dirtyTasks);
			if(task == nullptr)
			{
				if(processes.empty() && !dirtyTasks.empty())
				{
					// No running processes, yet no process to run. This is a dead-lock...
					std::cout << "Dead-lock detected.\n";
					return 1;
				}
				break;
			}

			processes.emplace_back(
				std::async(std::launch::async,
				           [task]()
				           {
					           return task->run();
				           }));
			started_one = true;
			std::this_thread::sleep_for(2ms);
		}

		for(auto process = processes.begin();
		    process != processes.end();
		    ++process)
		{
			if(process->valid())
			{
				if(process->get() != 0)
				{
					// TODO: Wait for other processes to finish before returning
					return 1;
				}
				processes.erase(process);
				break;
			}
		}

		if(started_one)
		{
			std::this_thread::sleep_for(2ms);
		}
		else
		{
			std::this_thread::sleep_for(200ms);
		}
	}

	for(auto process = processes.begin();
	    process != processes.end();
	    ++process)
	{
		process->wait();
		auto ret = process->get();
		if(ret != 0)
		{
			return 1;
		}
	}

	return 0;
}

namespace
{
std::set<std::shared_ptr<Task>> getDepTasks(std::shared_ptr<Task> task)
{
	std::set<std::shared_ptr<Task>> tasks;
	tasks.insert(task);

	auto deps = task->getDependsTasks();
	for(const auto& dep : deps)
	{
		auto depSet = getDepTasks(dep);
		for(const auto& dep : depSet)
		{
			tasks.insert(dep);
		}
	}

	return tasks;
}
}

int build(const Settings& settings,
          const std::string& name,
          const std::list<std::shared_ptr<Task>>& all_tasks)
{
	bool task_found{false};
	for(auto task : all_tasks)
	{
		if(task->name() == name || task->target() == name)
		{
			std::cout << name << "\n";
			task_found = true;

			auto depSet = getDepTasks(task);
			std::list<std::shared_ptr<Task>> ts;
			for(const auto& task : depSet)
			{
				ts.push_back(task);
			}
			auto ret = build(settings, name, ts, all_tasks);
			if(ret != 0)
			{
				return ret;
			}

			break;
		}
	}

	if(!task_found)
	{
		std::cerr << "*** No rule to make target '" << name << "'.  Stop.\n";
		return 1;
	}

	return 0;
}