/* This file is part of the dynarmic project.
 * Copyright (c) 2018 MerryMage
 * This software may be used and distributed according to the terms of the GNU
 * General Public License version 2 or any later version.
 */

#pragma once

#include <array>
#include <cinttypes>
#include <map>

#include <dynarmic/A64/a64.h>

#include "common/assert.h"
#include "common/common_types.h"

using Vector = Dynarmic::A64::Vector;

class TestEnv final : public Dynarmic::A64::UserCallbacks {
public:
    u64 ticks_left = 0;
    bool code_mem_modified_by_guest = false;
    std::array<u32, 1024> code_mem{};
    std::map<u64, u8> modified_memory;

    std::uint32_t MemoryReadCode(u64 vaddr) override {
        if (vaddr < code_mem.size() * sizeof(u32)) {
            size_t index = vaddr / sizeof(u32);
            return code_mem[index];
        }
        return 0x14000000; // B .
    }

    std::uint8_t MemoryRead8(u64 vaddr) override {
        if (vaddr < 4 * code_mem.size()) {
            return reinterpret_cast<u8*>(code_mem.data())[vaddr];
        }
        if (auto iter = modified_memory.find(vaddr); iter != modified_memory.end()) {
            return iter->second;
        }
        return static_cast<u8>(vaddr);
    }
    std::uint16_t MemoryRead16(u64 vaddr) override {
        return u16(MemoryRead8(vaddr)) | u16(MemoryRead8(vaddr + 1)) << 8;
    }
    std::uint32_t MemoryRead32(u64 vaddr) override {
        return u32(MemoryRead16(vaddr)) | u32(MemoryRead16(vaddr + 2)) << 16;
    }
    std::uint64_t MemoryRead64(u64 vaddr) override {
        return u64(MemoryRead32(vaddr)) | u64(MemoryRead32(vaddr + 4)) << 32;
    }
    Vector MemoryRead128(u64 vaddr) override {
        return {MemoryRead64(vaddr), MemoryRead64(vaddr + 8)};
    }

    void MemoryWrite8(u64 vaddr, std::uint8_t value) override {
        if (vaddr < code_mem.size() * sizeof(u32)) {
            code_mem_modified_by_guest = true;
        }
        modified_memory[vaddr] = value;
    }
    void MemoryWrite16(u64 vaddr, std::uint16_t value) override {
        MemoryWrite8(vaddr, static_cast<u8>(value));
        MemoryWrite8(vaddr + 1, static_cast<u8>(value >> 8));
    }
    void MemoryWrite32(u64 vaddr, std::uint32_t value) override {
        MemoryWrite16(vaddr, static_cast<u16>(value));
        MemoryWrite16(vaddr + 2, static_cast<u16>(value >> 16));
    }
    void MemoryWrite64(u64 vaddr, std::uint64_t value) override {
        MemoryWrite32(vaddr, static_cast<u32>(value));
        MemoryWrite32(vaddr + 4, static_cast<u32>(value >> 32));
    }
    void MemoryWrite128(u64 vaddr, Vector value) override {
        MemoryWrite64(vaddr, value[0]);
        MemoryWrite64(vaddr + 4, value[1]);
    }

    void InterpreterFallback(u64 pc, size_t num_instructions) override { ASSERT_MSG(false, "InterpreterFallback(%" PRIx64 ", %zu)", pc, num_instructions); }

    void CallSVC(std::uint32_t swi) override { ASSERT_MSG(false, "CallSVC(%u)", swi); }

    void ExceptionRaised(u64 pc, Dynarmic::A64::Exception /*exception*/) override { ASSERT_MSG(false, "ExceptionRaised(%" PRIx64 ")", pc); }

    void AddTicks(std::uint64_t ticks) override {
        if (ticks > ticks_left) {
            ticks_left = 0;
            return;
        }
        ticks_left -= ticks;
    }
    std::uint64_t GetTicksRemaining() override {
        return ticks_left;
    }
};