#include <iostream>
#include <filesystem>
#include <fstream>

#include "catch.hpp"

#include "daggy/Utilities.hpp"
#include "daggy/Serialization.hpp"
#include "daggy/executors/task/ForkingTaskExecutor.hpp"
#include "daggy/loggers/dag_run/StdOutLogger.hpp"

TEST_CASE("Parameter Expansion", "[utilities_parameter_expansion]") {
    SECTION("Basic expansion") {
        std::string testParams{R"({"DATE": ["2021-05-06", "2021-05-07" ], "SOURCE": "name", "TYPE": ["a", "b", "c"]})"};
        auto params = daggy::parametersFromJSON(testParams);
        std::vector<std::string> cmd{"/usr/bin/echo", "{{DATE}}", "{{SOURCE}}", "{{TYPE}}"};
        auto allCommands = daggy::expandCommands(cmd, params);

        REQUIRE(allCommands.size() == 6);
    }

    SECTION("Skip over unused parameters") {
        std::string testParams{R"({"DATE": ["2021-05-06", "2021-05-07" ], "SOURCE": "name", "TYPE": ["a", "b", "c"]})"};
        auto params = daggy::parametersFromJSON(testParams);
        std::vector<std::string> cmd{"/usr/bin/echo", "{{DATE}}", "{{SOURCE}}"};
        auto allCommands = daggy::expandCommands(cmd, params);

        // TYPE isn't used, so it's just |DATE| * |SOURCE|
        REQUIRE(allCommands.size() == 2);
    }
}

TEST_CASE("DAG Runner", "[utilities_dag_runner]") {
    daggy::executors::task::ForkingTaskExecutor ex(10);
    daggy::loggers::dag_run::StdOutLogger logger;

    std::string taskJSON = R"([{"name": "A", "command": ["/bin/echo", "A"], "children": ["C"]}, {"name": "B", "command": ["/bin/echo", "B"], "children": ["C"]},{"name": "C", "command": ["/bin/echo", "C"]}])";
    auto tasks = daggy::tasksFromJSON(taskJSON);
    auto dag = daggy::buildDAGFromTasks(tasks);

    auto runID = logger.startDAGRun("test_run", tasks);
    daggy::runDAG(runID, tasks, ex, logger, dag);
}