#include <stdio.h>
#include <doctest/doctest.h>
#include <tug/Simulation.hpp>
#include "TestUtils.cpp"
#include <string>

// include the configured header file
#include <testSimulation.hpp>

static Grid setupSimulation() {
    int row = 11;
    int col = 11;
    int domain_row = 10;
    int domain_col = 10;


    // Grid
    Grid grid = Grid(row, col);
    grid.setDomain(domain_row, domain_col);

    MatrixXd concentrations = MatrixXd::Constant(row, col, 0);
    concentrations(5,5) = 1;
    grid.setConcentrations(concentrations);

    MatrixXd alpha = MatrixXd::Constant(row, col, 1);
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 6; j++) {
            alpha(i, j) = 0.01;
        }
    }
    for (int i = 0; i < 5; i++) {
        for (int j = 6; j < 11; j++) {
            alpha(i, j) = 0.001;
        }
    }
    for (int i = 5; i < 11; i++) {
        for (int j = 6; j < 11; j++) {
            alpha(i, j) = 0.1;
        }
    }
    grid.setAlpha(alpha, alpha);


    // Boundary
    Boundary bc = Boundary(grid);


    // Simulation
    Simulation sim = Simulation(grid, bc, FTCS_APPROACH);
    sim.setTimestep(0.001);
    sim.setIterations(7000);
    sim.run();

    // RUN
    return grid;
    
}

TEST_CASE("equality to reference matrix") {
    // set string from the header file
    string test_path = testSimulationCSVDir;
    MatrixXd reference = CSV2Eigen(test_path);
    Grid grid = setupSimulation();
    CHECK(checkSimilarity(reference, grid.getConcentrations(), 0.1) == true);
}

TEST_CASE("Initialize environment"){
    int rc = 12;
    Grid grid(rc, rc);
    Boundary boundary(grid);

    CHECK_NOTHROW(Simulation sim(grid, boundary, FTCS_APPROACH));
    }

TEST_CASE("Simulation environment"){
    int rc = 12;
    Grid grid(rc, rc);
    Boundary boundary(grid);
    Simulation sim(grid, boundary, FTCS_APPROACH);

    SUBCASE("default paremeters"){
        CHECK_EQ(sim.getIterations(), 1000);
    }

    SUBCASE("set iterations"){
        CHECK_NOTHROW(sim.setIterations(2000));
        CHECK_EQ(sim.getIterations(), 2000);
        CHECK_THROWS(sim.setIterations(-300));
    }

    SUBCASE("set timestep"){
        CHECK_NOTHROW(sim.setTimestep(0.1));
        CHECK_EQ(sim.getTimestep(), 0.1);
        CHECK_THROWS(sim.setTimestep(-0.3));
    }

    SUBCASE("filename"){
        string s1 = sim.createCSVfile();
        string s2 = "FTCS_12_12_1000";
        CHECK_EQ(s1.find(s2) != std::string::npos, true);
    }   
}