#include <catch2/catch.hpp>

#include <exception>
#include <numeric>
#include <sstream>

#include <boost/regex.hpp>

#include "libslic3r/Config.hpp"
#include "libslic3r/Print.hpp"
#include "libslic3r/PrintConfig.hpp"
#include "libslic3r/libslic3r.h"

#include "test_data.hpp"

using namespace Slic3r;

SCENARIO("Output file format", "[CustomGCode]")
{
    WHEN("output_file_format set") {
        auto config = Slic3r::DynamicPrintConfig::full_print_config_with({
            { "travel_speed",                   "130"},
            { "layer_height",                   "0.4"},
            { "output_filename_format",         "ts_[travel_speed]_lh_[layer_height].gcode" },
            { "start_gcode",                    "TRAVEL:[travel_speed] HEIGHT:[layer_height]\n" }
        });

        Print print;
        Model model;
        Test::init_print({ Test::TestMesh::cube_2x20x10 }, print, model, config);
    
        std::string output_file = print.output_filepath({}, {});
        THEN("print config options are replaced in output filename") {
            REQUIRE(output_file == "ts_130_lh_0.4.gcode");
        }
    }
}

SCENARIO("Custom G-code", "[CustomGCode]")
{
    WHEN("start_gcode and layer_gcode set") {
        auto config = Slic3r::DynamicPrintConfig::full_print_config_with({
            { "start_gcode", "_MY_CUSTOM_START_GCODE_" },  // to avoid dealing with the nozzle lift in start G-code
            { "layer_gcode", "_MY_CUSTOM_LAYER_GCODE_" }
        });
        GCodeReader parser;
        bool        last_move_was_z_change = false;
        int         num_layer_changes_not_applied = 0;
        parser.parse_buffer(Slic3r::Test::slice({ Test::TestMesh::cube_2x20x10 }, config), 
            [&last_move_was_z_change, &num_layer_changes_not_applied](Slic3r::GCodeReader &self, const Slic3r::GCodeReader::GCodeLine &line)
        {
            if (last_move_was_z_change != line.cmd_is("_MY_CUSTOM_LAYER_GCODE_"))
                ++ num_layer_changes_not_applied;
            last_move_was_z_change = line.dist_Z(self) > 0;
        });
        THEN("custom layer G-code is applied after Z move and before other moves") {
            REQUIRE(num_layer_changes_not_applied == 0);
        }
    };

    auto config = Slic3r::DynamicPrintConfig::new_with({
        { "nozzle_diameter",            { 0.6,0.6,0.6,0.6 } },
        { "extruder",                   2 },
        { "first_layer_temperature",    { 200, 205 } }
    });
    config.normalize_fdm();
    WHEN("Printing with single but non-zero extruder") {
        std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
        THEN("temperature set correctly for non-zero yet single extruder") {
            REQUIRE(Slic3r::Test::contains(gcode, "\nM104 S205 T1 ;"));
        }
        THEN("unused extruder correctly ignored") {
            REQUIRE(! Slic3r::Test::contains_regex(gcode, "M104 S\\d+ T0"));
        }
    }
    WHEN("Printing with two extruders") {
        config.opt_int("infill_extruder") = 1;
        std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
        THEN("temperature set correctly for first extruder") {
            REQUIRE(Slic3r::Test::contains(gcode, "\nM104 S200 T0 ;"));
        };
        THEN("temperature set correctly for second extruder") {
            REQUIRE(Slic3r::Test::contains(gcode, "\nM104 S205 T1 ;"));
        };
    }
    
    auto test = [](DynamicPrintConfig &config) {
        // we use the [infill_extruder] placeholder to make sure this test doesn't
        // catch a false positive caused by the unparsed start G-code option itself
        // being embedded in the G-code
        config.opt_int("infill_extruder") = 1;
        std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
        THEN("temperature placeholder for first extruder correctly populated") {
            REQUIRE(Slic3r::Test::contains(gcode, "temp0:200"));
        }
        THEN("temperature placeholder for second extruder correctly populated") {
            REQUIRE(Slic3r::Test::contains(gcode, "temp1:205"));
        }
        THEN("temperature placeholder for unused extruder populated with first value") {
            REQUIRE(Slic3r::Test::contains(gcode, "temp2:200"));
        }
    };
    WHEN("legacy syntax") {
        config.set_deserialize_strict("start_gcode", 
            ";__temp0:[first_layer_temperature_0]__\n"
            ";__temp1:[first_layer_temperature_1]__\n"
            ";__temp2:[first_layer_temperature_2]__\n");
        test(config);
    }
    WHEN("new syntax") {
        config.set_deserialize_strict("start_gcode",
            ";__temp0:{first_layer_temperature[0]}__\n"
            ";__temp1:{first_layer_temperature[1]}__\n"
            ";__temp2:{first_layer_temperature[2]}__\n");
        test(config);
    }
    WHEN("Vojtech's syntax") {
        config.set_deserialize_strict({
            { "infill_extruder", 1 },
            { "start_gcode",
                ";substitution:{if infill_extruder==1}extruder1"
                "{elsif infill_extruder==2}extruder2"
                "{else}extruder3{endif}"
            }
        });
        std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
        THEN("if / else / endif - first block returned") {
            REQUIRE(Test::contains(gcode, "\n;substitution:extruder1\n"));
        }
    }
    GIVEN("Layer change G-codes")
    {
        auto config = Slic3r::DynamicPrintConfig::full_print_config_with({
            { "before_layer_gcode",     ";BEFORE [layer_num]" },
            { "layer_gcode",            ";CHANGE [layer_num]" },
            { "support_material",       1 },
            { "layer_height",           0.2 }
        });
        WHEN("before and after layer change G-codes set") {
            std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::overhang }, config);
            GCodeReader parser;
            std::vector<int> before;
            std::vector<int> change;
            parser.parse_buffer(gcode, [&before, &change](Slic3r::GCodeReader &self, const Slic3r::GCodeReader::GCodeLine &line){
                int d;
                if (sscanf(line.raw().c_str(), ";BEFORE %d", &d) == 1)
                    before.emplace_back(d);
                else if (sscanf(line.raw().c_str(), ";CHANGE %d", &d) == 1) {
                    change.emplace_back(d);
                    if (d != before.back())
                        throw std::runtime_error("inconsistent layer_num before and after layer change");
                }
            });
            THEN("layer_num is consistent before and after layer changes") {
                REQUIRE(before == change);
            }
            THEN("layer_num grows continously") {
                // i.e. no duplicates or regressions
                bool successive = true;
                for (size_t i = 1; i < change.size(); ++ i)
                    if (change[i - 1] + 1 != change[i])
                        successive = false;
                REQUIRE(successive);
            }
        }
    }
    GIVEN("if / elsif / elsif / elsif / else / endif")
    {
        auto config = Slic3r::DynamicPrintConfig::new_with({
            { "nozzle_diameter",        { 0.6,0.6,0.6,0.6,0.6 } },
            { "start_gcode",            
                ";substitution:{if infill_extruder==1}if block"
                "{elsif infill_extruder==2}elsif block 1"
                "{elsif infill_extruder==3}elsif block 2"
                "{elsif infill_extruder==4}elsif block 3"
                "{else}endif block{endif}"
                ":end"
            }
        });
        std::string returned[] = { "" /* indexed by one based extruder ID */, "if block", "elsif block 1", "elsif block 2", "elsif block 3", "endif block" };
        auto test = [&config, &returned](int i) {
            config.set_deserialize_strict({ { "infill_extruder", i } });
            std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
            int found_error = 0;
            for (int j = 1; j <= 5; ++ j)
                if (i != j && Slic3r::Test::contains(gcode, std::string("substitution:") + returned[j] + ":end"))
                    // failure
                    ++ found_error;
            THEN(std::string("if / else / endif returned ") + returned[i]) {
                REQUIRE(Slic3r::Test::contains(gcode, std::string("substitution:") + returned[i] + ":end"));
            }
            THEN(std::string("if / else / endif - only ") + returned[i] + "returned") {
                REQUIRE(found_error == 0);
            }
        };
        WHEN("infill_extruder == 1") { test(1); }
        WHEN("infill_extruder == 2") { test(2); }
        WHEN("infill_extruder == 3") { test(3); }
        WHEN("infill_extruder == 4") { test(4); }
        WHEN("infill_extruder == 5") { test(5); }
    }
    GIVEN("nested if / if / else / endif") {
        auto config = Slic3r::DynamicPrintConfig::full_print_config_with({
            { "nozzle_diameter",        { 0.6,0.6,0.6,0.6,0.6 } },
            { "start_gcode",            
                ";substitution:{if infill_extruder==1}{if perimeter_extruder==1}block11{else}block12{endif}"
                "{elsif infill_extruder==2}{if perimeter_extruder==1}block21{else}block22{endif}"
                "{else}{if perimeter_extruder==1}block31{else}block32{endif}{endif}:end"
            }
        });
        auto test = [&config](int i) {
            config.opt_int("infill_extruder") = i;
            int failed = 0;
            for (int j = 1; j <= 2; ++ j) {
                config.opt_int("perimeter_extruder") = j;
                std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
                if (! Slic3r::Test::contains(gcode, std::string("substitution:block") + std::to_string(i) + std::to_string(j) + ":end"))
                    ++ failed;
            }
            THEN(std::string("two level if / else / endif - block for infill_extruder ") + std::to_string(i) + "succeeded") {
                REQUIRE(failed == 0);
            }
        };
        WHEN("infill_extruder == 1") { test(1); }
        WHEN("infill_extruder == 2") { test(2); }
        WHEN("infill_extruder == 3") { test(3); }
    }
    GIVEN("printer type in notes") {
        auto config = Slic3r::DynamicPrintConfig::new_with({
            { "start_gcode",            
              ";substitution:{if notes==\"MK2\"}MK2{elsif notes==\"MK3\"}MK3{else}MK1{endif}:end"
            }
        });
        auto test = [&config](const std::string &printer_name) {
            config.set_deserialize_strict("notes", printer_name);
            std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
            THEN(std::string("printer name ") + printer_name + " matched") {
                REQUIRE(Slic3r::Test::contains(gcode, std::string("substitution:") + printer_name + ":end"));
            }
        };
        WHEN("printer MK2") { test("MK2"); }
        WHEN("printer MK3") { test("MK3"); }
        WHEN("printer MK1") { test("MK1"); }
    }
    GIVEN("sequential print with between_objects_gcode") {
        auto config = Slic3r::DynamicPrintConfig::full_print_config_with({
            { "complete_objects",       1 },
            { "between_objects_gcode",  "_MY_CUSTOM_GCODE_" }
        });
        std::string gcode = Slic3r::Test::slice(
            // 3x 20mm box
            { Slic3r::Test::TestMesh::cube_20x20x20, Slic3r::Test::TestMesh::cube_20x20x20, Slic3r::Test::TestMesh::cube_20x20x20 },
            config);
        THEN("between_objects_gcode is applied correctly") {
            const boost::regex expression("^_MY_CUSTOM_GCODE_");
            const std::ptrdiff_t match_count = 
                std::distance(boost::sregex_iterator(gcode.begin(), gcode.end(), expression), boost::sregex_iterator());
            REQUIRE(match_count == 2);
        }
    }
    GIVEN("before_layer_gcode increments global variable") {
        auto config = Slic3r::DynamicPrintConfig::new_with({
            { "start_gcode", "{global counter=0}" },
            { "before_layer_gcode", ";Counter{counter=counter+1;counter}\n" }
        });
        std::string gcode = Slic3r::Test::slice({ Slic3r::Test::TestMesh::cube_20x20x20 }, config);
        THEN("The counter is emitted multiple times before layer change.") {
            REQUIRE(Slic3r::Test::contains(gcode, ";Counter1\n"));
            REQUIRE(Slic3r::Test::contains(gcode, ";Counter2\n"));
            REQUIRE(Slic3r::Test::contains(gcode, ";Counter3\n"));
        }
    }
}