#include "content/views/view_disassembler.hpp"

#include <hex/providers/provider.hpp>
#include <hex/helpers/fmt.hpp>

#include <cstring>
#include <thread>

using namespace std::literals::string_literals;

namespace hex::plugin::builtin {

    ViewDisassembler::ViewDisassembler() : View("hex.builtin.view.disassembler.name") {
        EventManager::subscribe<EventDataChanged>(this, [this]() {
            this->disassemble();
        });

        EventManager::subscribe<EventRegionSelected>(this, [this](Region region) {
            if (this->m_shouldMatchSelection) {
                if (region.address == size_t(-1)) {
                    this->m_codeRegion[0] = this->m_codeRegion[1] = 0;
                } else {
                    this->m_codeRegion[0] = region.address;
                    this->m_codeRegion[1] = region.address + region.size;
                }
            }
        });

        EventManager::subscribe<EventFileUnloaded>(this, [this] {
            this->m_disassembly.clear();
        });
    }

    ViewDisassembler::~ViewDisassembler() {
        EventManager::unsubscribe<EventDataChanged>(this);
        EventManager::unsubscribe<EventRegionSelected>(this);
        EventManager::unsubscribe<EventFileUnloaded>(this);
    }

    void ViewDisassembler::disassemble() {
        this->m_disassembly.clear();
        this->m_disassembling = true;

        std::thread([this] {
            csh capstoneHandle;
            cs_insn *instructions = nullptr;

            cs_mode mode = this->m_mode;

            if (cs_open(Disassembler::toCapstoneArchictecture(this->m_architecture), mode, &capstoneHandle) == CS_ERR_OK) {

                cs_option(capstoneHandle, CS_OPT_SKIPDATA, CS_OPT_ON);

                auto provider = ImHexApi::Provider::get();
                std::vector<u8> buffer(2048, 0x00);
                size_t size = (this->m_codeRegion[1] - this->m_codeRegion[0] + 1);

                auto task = ImHexApi::Tasks::createTask("hex.builtin.view.disassembler.disassembling", size);
                for (u64 address = 0; address < size; address += 2048) {
                    task.update(address);

                    size_t bufferSize = std::min(u64(2048), (this->m_codeRegion[1] - this->m_codeRegion[0] + 1) - address);
                    provider->read(this->m_codeRegion[0] + address, buffer.data(), bufferSize);

                    size_t instructionCount = cs_disasm(capstoneHandle, buffer.data(), bufferSize, this->m_baseAddress + address, 0, &instructions);
                    if (instructionCount == 0)
                        break;

                    this->m_disassembly.reserve(this->m_disassembly.size() + instructionCount);

                    u64 usedBytes = 0;
                    for (u32 i = 0; i < instructionCount; i++) {
                        const auto &instr = instructions[i];
                        Disassembly disassembly = { 0 };
                        disassembly.address = instr.address;
                        disassembly.offset = this->m_codeRegion[0] + address + usedBytes;
                        disassembly.size = instr.size;
                        disassembly.mnemonic = instr.mnemonic;
                        disassembly.operators = instr.op_str;

                        for (u16 j = 0; j < instr.size; j++)
                            disassembly.bytes += hex::format("{0:02X} ", instr.bytes[j]);
                        disassembly.bytes.pop_back();

                        this->m_disassembly.push_back(disassembly);

                        usedBytes += instr.size;
                    }

                    if (instructionCount < bufferSize)
                        address -= (bufferSize - usedBytes);

                    cs_free(instructions, instructionCount);
                }

                cs_close(&capstoneHandle);
            }

            this->m_disassembling = false;
        }).detach();
    }

    void ViewDisassembler::drawContent() {

        if (ImGui::Begin(View::toWindowName("hex.builtin.view.disassembler.name").c_str(), &this->getWindowOpenState(), ImGuiWindowFlags_NoCollapse)) {

            auto provider = ImHexApi::Provider::get();
            if (ImHexApi::Provider::isValid() && provider->isReadable()) {
                ImGui::TextUnformatted("hex.builtin.view.disassembler.position"_lang);
                ImGui::Separator();

                ImGui::InputScalar("hex.builtin.view.disassembler.base"_lang, ImGuiDataType_U64, &this->m_baseAddress, nullptr, nullptr, "%08llX", ImGuiInputTextFlags_CharsHexadecimal);
                ImGui::InputScalarN("hex.builtin.view.disassembler.region"_lang, ImGuiDataType_U64, this->m_codeRegion, 2, nullptr, nullptr, "%08llX", ImGuiInputTextFlags_CharsHexadecimal);

                ImGui::Checkbox("hex.common.match_selection"_lang, &this->m_shouldMatchSelection);
                if (ImGui::IsItemEdited()) {
                    // Force execution of Region Selection Event
                    EventManager::post<RequestSelectionChange>(Region { 0, 0 });
                }

                ImGui::NewLine();
                ImGui::TextUnformatted("hex.builtin.view.disassembler.settings.header"_lang);
                ImGui::Separator();

                if (ImGui::Combo("hex.builtin.view.disassembler.arch"_lang, reinterpret_cast<int *>(&this->m_architecture), Disassembler::ArchitectureNames, Disassembler::getArchitectureSupportedCount()))
                    this->m_mode = cs_mode(0);


                if (ImGui::BeginChild("modes", ImVec2(0, ImGui::GetTextLineHeightWithSpacing() * 6), true, ImGuiWindowFlags_AlwaysAutoResize)) {

                    static int littleEndian = true;
                    ImGui::RadioButton("hex.common.little_endian"_lang, &littleEndian, true);
                    ImGui::SameLine();
                    ImGui::RadioButton("hex.common.big_endian"_lang, &littleEndian, false);

                    ImGui::NewLine();

                    switch (this->m_architecture) {
                    case Architecture::ARM: {
                            static int mode = CS_MODE_ARM;
                            ImGui::RadioButton("hex.builtin.view.disassembler.arm.arm"_lang, &mode, CS_MODE_ARM);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.arm.thumb"_lang, &mode, CS_MODE_THUMB);

                            static int extraMode = 0;
                            ImGui::RadioButton("hex.builtin.view.disassembler.arm.default"_lang, &extraMode, 0);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.arm.cortex_m"_lang, &extraMode, CS_MODE_MCLASS);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.arm.armv8"_lang, &extraMode, CS_MODE_V8);

                            this->m_mode = cs_mode(mode | extraMode);
                        }
                        break;
                    case Architecture::MIPS: {
                            static int mode = CS_MODE_MIPS32;
                            ImGui::RadioButton("hex.builtin.view.disassembler.mips.mips32"_lang, &mode, CS_MODE_MIPS32);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.mips.mips64"_lang, &mode, CS_MODE_MIPS64);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.mips.mips32R6"_lang, &mode, CS_MODE_MIPS32R6);

                            ImGui::RadioButton("hex.builtin.view.disassembler.mips.mips2"_lang, &mode, CS_MODE_MIPS2);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.mips.mips3"_lang, &mode, CS_MODE_MIPS3);

                            static bool microMode;
                            ImGui::Checkbox("hex.builtin.view.disassembler.mips.micro"_lang, &microMode);

                            this->m_mode = cs_mode(mode | (microMode ? CS_MODE_MICRO : 0));
                        }
                        break;
                    case Architecture::X86: {
                            static int mode = CS_MODE_32;
                            ImGui::RadioButton("hex.builtin.view.disassembler.16bit"_lang, &mode, CS_MODE_16);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.32bit"_lang, &mode, CS_MODE_32);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.64bit"_lang, &mode, CS_MODE_64);

                            this->m_mode = cs_mode(mode);
                        }
                        break;
                    case Architecture::PPC: {
                            static int mode = CS_MODE_32;
                            ImGui::RadioButton("hex.builtin.view.disassembler.32bit"_lang, &mode, CS_MODE_32);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.64bit"_lang, &mode, CS_MODE_64);

                            static bool qpx = false;
                            ImGui::Checkbox("hex.builtin.view.disassembler.ppc.qpx"_lang, &qpx);
                            static bool spe = false;
                            ImGui::Checkbox("hex.builtin.view.disassembler.ppc.spe"_lang, &spe);
                            static bool booke = false;
                            ImGui::Checkbox("hex.builtin.view.disassembler.ppc.booke"_lang, &booke);

                            this->m_mode = cs_mode(mode | (qpx ? CS_MODE_QPX : 0) | (spe ? CS_MODE_SPE : 0) | (booke ? CS_MODE_BOOKE : 0));
                        }
                        break;
                    case Architecture::SPARC: {
                            static bool v9Mode = false;
                            ImGui::Checkbox("hex.builtin.view.disassembler.sparc.v9"_lang, &v9Mode);

                            this->m_mode = cs_mode(v9Mode ? CS_MODE_V9 : 0);
                        }
                        break;
                    case Architecture::RISCV: {
                            static int mode = CS_MODE_RISCV32;
                            ImGui::RadioButton("hex.builtin.view.disassembler.32bit"_lang, &mode, CS_MODE_RISCV32);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.64bit"_lang, &mode, CS_MODE_RISCV64);

                            static bool compressed = false;
                            ImGui::Checkbox("hex.builtin.view.disassembler.riscv.compressed"_lang, &compressed);

                            this->m_mode = cs_mode(mode | (compressed ? CS_MODE_RISCVC : 0));
                        }
                        break;
                    case Architecture::M68K: {
                            static int selectedMode = 0;

                            std::pair<const char*, cs_mode> modes[] = {
                                { "hex.builtin.view.disassembler.m68k.000"_lang, CS_MODE_M68K_000 },
                                { "hex.builtin.view.disassembler.m68k.010"_lang, CS_MODE_M68K_010 },
                                { "hex.builtin.view.disassembler.m68k.020"_lang, CS_MODE_M68K_020 },
                                { "hex.builtin.view.disassembler.m68k.030"_lang, CS_MODE_M68K_030 },
                                { "hex.builtin.view.disassembler.m68k.040"_lang, CS_MODE_M68K_040 },
                                { "hex.builtin.view.disassembler.m68k.060"_lang, CS_MODE_M68K_060 },
                            };

                            if (ImGui::BeginCombo("hex.builtin.view.disassembler.settings.mode"_lang, modes[selectedMode].first)) {
                                for (u32 i = 0; i < IM_ARRAYSIZE(modes); i++) {
                                    if (ImGui::Selectable(modes[i].first))
                                        selectedMode = i;
                                }
                                ImGui::EndCombo();
                            }

                            this->m_mode = cs_mode(modes[selectedMode].second);
                        }
                        break;
                    case Architecture::M680X: {
                            static int selectedMode = 0;

                            std::pair<const char*, cs_mode> modes[] = {
                                { "hex.builtin.view.disassembler.m680x.6301"_lang,  CS_MODE_M680X_6301  },
                                { "hex.builtin.view.disassembler.m680x.6309"_lang,  CS_MODE_M680X_6309  },
                                { "hex.builtin.view.disassembler.m680x.6800"_lang,  CS_MODE_M680X_6800  },
                                { "hex.builtin.view.disassembler.m680x.6801"_lang,  CS_MODE_M680X_6801  },
                                { "hex.builtin.view.disassembler.m680x.6805"_lang,  CS_MODE_M680X_6805  },
                                { "hex.builtin.view.disassembler.m680x.6808"_lang,  CS_MODE_M680X_6808  },
                                { "hex.builtin.view.disassembler.m680x.6809"_lang,  CS_MODE_M680X_6809  },
                                { "hex.builtin.view.disassembler.m680x.6811"_lang,  CS_MODE_M680X_6811  },
                                { "hex.builtin.view.disassembler.m680x.cpu12"_lang, CS_MODE_M680X_CPU12 },
                                { "hex.builtin.view.disassembler.m680x.hcs08"_lang, CS_MODE_M680X_HCS08 },
                            };

                            if (ImGui::BeginCombo("hex.builtin.view.disassembler.settings.mode"_lang, modes[selectedMode].first)) {
                                for (u32 i = 0; i < IM_ARRAYSIZE(modes); i++) {
                                    if (ImGui::Selectable(modes[i].first))
                                        selectedMode = i;
                                }
                                ImGui::EndCombo();
                            }

                            this->m_mode = cs_mode(modes[selectedMode].second);
                        }
                        break;
                    case Architecture::MOS65XX: {
                            static int selectedMode = 0;

                            std::pair<const char*, cs_mode> modes[] = {
                                { "hex.builtin.view.disassembler.mos65xx.6502"_lang,            CS_MODE_MOS65XX_6502            },
                                { "hex.builtin.view.disassembler.mos65xx.65c02"_lang,           CS_MODE_MOS65XX_65C02           },
                                { "hex.builtin.view.disassembler.mos65xx.w65c02"_lang,          CS_MODE_MOS65XX_W65C02          },
                                { "hex.builtin.view.disassembler.mos65xx.65816"_lang,           CS_MODE_MOS65XX_65816           },
                                { "hex.builtin.view.disassembler.mos65xx.65816_long_m"_lang,    CS_MODE_MOS65XX_65816_LONG_M    },
                                { "hex.builtin.view.disassembler.mos65xx.65816_long_x"_lang,    CS_MODE_MOS65XX_65816_LONG_X    },
                                { "hex.builtin.view.disassembler.mos65xx.65816_long_mx"_lang,   CS_MODE_MOS65XX_65816_LONG_MX   },
                            };

                            if (ImGui::BeginCombo("hex.builtin.view.disassembler.settings.mode"_lang, modes[selectedMode].first)) {
                                for (u32 i = 0; i < IM_ARRAYSIZE(modes); i++) {
                                    if (ImGui::Selectable(modes[i].first))
                                        selectedMode = i;
                                }
                                ImGui::EndCombo();
                            }

                            this->m_mode = cs_mode(modes[selectedMode].second);
                        }
                        break;
                    case Architecture::BPF: {
                            static int mode = CS_MODE_BPF_CLASSIC;
                            ImGui::RadioButton("hex.builtin.view.disassembler.bpf.classic"_lang, &mode, CS_MODE_BPF_CLASSIC);
                            ImGui::SameLine();
                            ImGui::RadioButton("hex.builtin.view.disassembler.bpf.extended"_lang, &mode, CS_MODE_BPF_EXTENDED);

                            this->m_mode = cs_mode(mode);
                        }
                        break;
                    case Architecture::EVM:
                    case Architecture::TMS320C64X:
                    case Architecture::ARM64:
                    case Architecture::SYSZ:
                    case Architecture::XCORE:
                    case Architecture::WASM:
                    case Architecture::MAX:
                        this->m_mode = cs_mode(0);
                        break;
                    }
                }
                ImGui::EndChild();

                ImGui::Disabled([this] {
                    if (ImGui::Button("hex.builtin.view.disassembler.disassemble"_lang))
                        this->disassemble();
                },
                                this->m_disassembling);

                if (this->m_disassembling) {
                    ImGui::SameLine();
                    ImGui::TextSpinner("hex.builtin.view.disassembler.disassembling"_lang);
                }

                ImGui::NewLine();

                ImGui::TextUnformatted("hex.builtin.view.disassembler.disassembly.title"_lang);
                ImGui::Separator();

                if (ImGui::BeginTable("##disassembly", 4, ImGuiTableFlags_ScrollY | ImGuiTableFlags_Borders | ImGuiTableFlags_Resizable | ImGuiTableFlags_RowBg | ImGuiTableFlags_Reorderable | ImGuiTableFlags_Hideable)) {
                    ImGui::TableSetupScrollFreeze(0, 1);
                    ImGui::TableSetupColumn("hex.builtin.view.disassembler.disassembly.address"_lang);
                    ImGui::TableSetupColumn("hex.builtin.view.disassembler.disassembly.offset"_lang);
                    ImGui::TableSetupColumn("hex.builtin.view.disassembler.disassembly.bytes"_lang);
                    ImGui::TableSetupColumn("hex.builtin.view.disassembler.disassembly.title"_lang);

                    if (!this->m_disassembling) {
                        ImGuiListClipper clipper;
                        clipper.Begin(this->m_disassembly.size());

                        ImGui::TableHeadersRow();
                        while (clipper.Step()) {
                            for (u64 i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) {
                                const auto &instruction = this->m_disassembly[i];
                                ImGui::TableNextRow();
                                ImGui::TableNextColumn();
                                if (ImGui::Selectable(("##DisassemblyLine"s + std::to_string(i)).c_str(), false, ImGuiSelectableFlags_SpanAllColumns)) {
                                    EventManager::post<RequestSelectionChange>(Region { instruction.offset, instruction.size });
                                }
                                ImGui::SameLine();
                                ImGui::TextFormatted("0x{0:X}", instruction.address);
                                ImGui::TableNextColumn();
                                ImGui::TextFormatted("0x{0:X}", instruction.offset);
                                ImGui::TableNextColumn();
                                ImGui::TextUnformatted(instruction.bytes.c_str());
                                ImGui::TableNextColumn();
                                ImGui::TextFormattedColored(ImColor(0xFFD69C56), "{}", instruction.mnemonic);
                                ImGui::SameLine();
                                ImGui::TextUnformatted(instruction.operators.c_str());
                            }
                        }

                        clipper.End();
                    }

                    ImGui::EndTable();
                }
            }
        }
        ImGui::End();
    }

}