// This example demonstrates how to use different methods to
// run a taskflow.
#include <taskflow/taskflow.hpp>

int main(){

 // create an executor and a taskflow
 tf::Executor executor(1);
 tf::Taskflow taskflow("Demo");

 auto A = taskflow.emplace([&](){ std::cout << "TaskA\n"; }).name("A");
 auto B = taskflow.emplace([&](tf::Subflow& subflow){
 std::cout << "TaskB\n";
 auto B1 = subflow.emplace([&](){ std::cout << "TaskB1\n"; }).name("B1");
 auto B2 = subflow.emplace([&](){ std::cout << "TaskB2\n"; }).name("B2");
 auto B3 = subflow.emplace([&](){ std::cout << "TaskB3\n"; }).name("B3");
 B1.precede(B3);
 B2.precede(B3);
 }).name("B");

 auto C = taskflow.emplace([&](){ std::cout << "TaskC\n"; }).name("C");
 auto D = taskflow.emplace([&](){ std::cout << "TaskD\n"; }).name("D");

 A.precede(B, C);
 B.precede(D);
 C.precede(D);

 // dumpping a taskflow before execution won't visualize subflow tasks
 std::cout << "Dump the taskflow before execution:\n";
 taskflow.dump(std::cout);

 std::cout << "Run the taskflow once without callback\n" << std::endl;
 executor.run(taskflow).get();
 std::cout << std::endl;

 // after execution, we can visualize subflow tasks
 std::cout << "Dump the taskflow after execution:\n";
 taskflow.dump(std::cout);
 std::cout << std::endl;

 std::cout << "Use wait_for_all to wait for the execution to finish\n";
 executor.run(taskflow).get();
 executor.wait_for_all();
 std::cout << std::endl;

 std::cout << "Execute the taskflow two times without a callback\n";
 executor.run(taskflow).get();
 std::cout << "Dump after two executions:\n";
 taskflow.dump(std::cout);
 std::cout << std::endl;

 std::cout << "Execute the taskflow four times with a callback\n";
 executor.run_n(taskflow, 4, [] () { std::cout << "finishes 4 runs\n"; })
 .get();
 std::cout << std::endl;

 std::cout << "Run the taskflow until the predicate returns true\n";
 executor.run_until(taskflow, [counter=3]() mutable {
 std::cout << "Counter = " << counter << std::endl;
 return counter -- == 0;
 }).get();

 taskflow.dump(std::cout);

 return 0;
}