#include "rendering/performance_hud.hpp"
#include "rendering/renderer.hpp"
#include "rendering/terrain_renderer.hpp"
#include "rendering/terrain_manager.hpp"
#include "rendering/water_renderer.hpp"
#include "rendering/skybox.hpp"
#include "rendering/celestial.hpp"
#include "rendering/starfield.hpp"
#include "rendering/clouds.hpp"
#include "rendering/lens_flare.hpp"
#include "rendering/weather.hpp"
#include "rendering/character_renderer.hpp"
#include "rendering/wmo_renderer.hpp"
#include "rendering/m2_renderer.hpp"
#include "rendering/camera.hpp"
#include <imgui.h>
#include <algorithm>
#include <sstream>
#include <iomanip>

namespace wowee {
namespace rendering {

PerformanceHUD::PerformanceHUD() {
}

PerformanceHUD::~PerformanceHUD() {
}

void PerformanceHUD::update(float deltaTime) {
    if (!enabled) {
        return;
    }

    // Store frame time
    frameTime = deltaTime;
    frameTimeHistory.push_back(deltaTime);

    // Keep history size limited
    while (frameTimeHistory.size() > MAX_FRAME_HISTORY) {
        frameTimeHistory.pop_front();
    }

    // Update stats periodically
    updateTimer += deltaTime;
    if (updateTimer >= UPDATE_INTERVAL) {
        updateTimer = 0.0f;
        calculateFPS();
    }
}

void PerformanceHUD::calculateFPS() {
    if (frameTimeHistory.empty()) {
        return;
    }

    // Current FPS (from last frame time)
    currentFPS = frameTime > 0.0001f ? 1.0f / frameTime : 0.0f;

    // Average FPS
    float sum = 0.0f;
    for (float ft : frameTimeHistory) {
        sum += ft;
    }
    float avgFrameTime = sum / frameTimeHistory.size();
    averageFPS = avgFrameTime > 0.0001f ? 1.0f / avgFrameTime : 0.0f;

    // Min/Max FPS (from last 2 seconds)
    minFPS = 10000.0f;
    maxFPS = 0.0f;
    for (float ft : frameTimeHistory) {
        if (ft > 0.0001f) {
            float fps = 1.0f / ft;
            minFPS = std::min(minFPS, fps);
            maxFPS = std::max(maxFPS, fps);
        }
    }
}

void PerformanceHUD::render(const Renderer* renderer, const Camera* camera) {
    if (!enabled || !renderer) {
        return;
    }

    // Set window position based on setting
    ImGuiWindowFlags flags = ImGuiWindowFlags_NoDecoration |
                            ImGuiWindowFlags_AlwaysAutoResize |
                            ImGuiWindowFlags_NoSavedSettings |
                            ImGuiWindowFlags_NoFocusOnAppearing |
                            ImGuiWindowFlags_NoNav;

    const float PADDING = 10.0f;
    ImGuiViewport* viewport = ImGui::GetMainViewport();
    ImVec2 work_pos = viewport->WorkPos;
    ImVec2 work_size = viewport->WorkSize;
    ImVec2 window_pos, window_pos_pivot;

    switch (position) {
        case Position::TOP_LEFT:
            window_pos.x = work_pos.x + PADDING;
            window_pos.y = work_pos.y + PADDING;
            window_pos_pivot.x = 0.0f;
            window_pos_pivot.y = 0.0f;
            break;
        case Position::TOP_RIGHT:
            window_pos.x = work_pos.x + work_size.x - PADDING;
            window_pos.y = work_pos.y + PADDING;
            window_pos_pivot.x = 1.0f;
            window_pos_pivot.y = 0.0f;
            break;
        case Position::BOTTOM_LEFT:
            window_pos.x = work_pos.x + PADDING;
            window_pos.y = work_pos.y + work_size.y - PADDING;
            window_pos_pivot.x = 0.0f;
            window_pos_pivot.y = 1.0f;
            break;
        case Position::BOTTOM_RIGHT:
            window_pos.x = work_pos.x + work_size.x - PADDING;
            window_pos.y = work_pos.y + work_size.y - PADDING;
            window_pos_pivot.x = 1.0f;
            window_pos_pivot.y = 1.0f;
            break;
    }

    ImGui::SetNextWindowPos(window_pos, ImGuiCond_Always, window_pos_pivot);
    ImGui::SetNextWindowBgAlpha(0.7f);  // Transparent background

    if (!ImGui::Begin("Performance", nullptr, flags)) {
        ImGui::End();
        return;
    }

    // FPS section
    if (showFPS) {
        ImGui::TextColored(ImVec4(1.0f, 1.0f, 0.0f, 1.0f), "PERFORMANCE");
        ImGui::Separator();

        // Color-code FPS
        ImVec4 fpsColor;
        if (currentFPS >= 60.0f) {
            fpsColor = ImVec4(0.0f, 1.0f, 0.0f, 1.0f);  // Green
        } else if (currentFPS >= 30.0f) {
            fpsColor = ImVec4(1.0f, 1.0f, 0.0f, 1.0f);  // Yellow
        } else {
            fpsColor = ImVec4(1.0f, 0.0f, 0.0f, 1.0f);  // Red
        }

        ImGui::Text("FPS: ");
        ImGui::SameLine();
        ImGui::TextColored(fpsColor, "%.1f", currentFPS);

        ImGui::Text("Avg: %.1f", averageFPS);
        ImGui::Text("Min: %.1f", minFPS);
        ImGui::Text("Max: %.1f", maxFPS);
        ImGui::Text("Frame: %.2f ms", frameTime * 1000.0f);

        ImGui::Spacing();
        ImGui::TextColored(ImVec4(0.9f, 0.8f, 0.6f, 1.0f), "CPU TIMINGS (ms)");
        ImGui::Text("Update: %.2f (Camera: %.2f)", renderer->getLastUpdateMs(), renderer->getLastCameraUpdateMs());
        ImGui::Text("Render: %.2f (Terrain: %.2f, WMO: %.2f, M2: %.2f)",
                    renderer->getLastRenderMs(),
                    renderer->getLastTerrainRenderMs(),
                    renderer->getLastWMORenderMs(),
                    renderer->getLastM2RenderMs());
        auto* wmoRenderer = renderer->getWMORenderer();
        auto* m2Renderer = renderer->getM2Renderer();
        if (wmoRenderer || m2Renderer) {
            ImGui::Text("Collision queries:");
            if (wmoRenderer) {
                ImGui::Text("  WMO: %.2f ms (%u calls)",
                            wmoRenderer->getQueryTimeMs(), wmoRenderer->getQueryCallCount());
            }
            if (m2Renderer) {
                ImGui::Text("  M2:  %.2f ms (%u calls)",
                            m2Renderer->getQueryTimeMs(), m2Renderer->getQueryCallCount());
            }
        }

        // Frame time graph
        if (!frameTimeHistory.empty()) {
            std::vector<float> frameTimesMs;
            frameTimesMs.reserve(frameTimeHistory.size());
            for (float ft : frameTimeHistory) {
                frameTimesMs.push_back(ft * 1000.0f);  // Convert to ms
            }
            ImGui::PlotLines("##frametime", frameTimesMs.data(), static_cast<int>(frameTimesMs.size()),
                           0, nullptr, 0.0f, 33.33f, ImVec2(200, 40));
        }

        ImGui::Spacing();
    }

    // Renderer stats
    if (showRenderer) {
        auto* terrainRenderer = renderer->getTerrainRenderer();
        if (terrainRenderer) {
            ImGui::TextColored(ImVec4(0.0f, 1.0f, 1.0f, 1.0f), "RENDERING");
            ImGui::Separator();

            int totalChunks = terrainRenderer->getChunkCount();
            int rendered = terrainRenderer->getRenderedChunkCount();
            int culled = terrainRenderer->getCulledChunkCount();
            int triangles = terrainRenderer->getTriangleCount();

            ImGui::Text("Chunks: %d", totalChunks);
            ImGui::Text("Rendered: %d", rendered);
            ImGui::Text("Culled: %d", culled);

            if (totalChunks > 0) {
                float visiblePercent = (rendered * 100.0f) / totalChunks;
                ImGui::Text("Visible: %.1f%%", visiblePercent);
            }

            ImGui::Text("Triangles: %s",
                       triangles >= 1000000 ?
                       (std::to_string(triangles / 1000) + "K").c_str() :
                       std::to_string(triangles).c_str());

            ImGui::Spacing();
        }
    }

    // Terrain streaming info
    if (showTerrain) {
        auto* terrainManager = renderer->getTerrainManager();
        if (terrainManager) {
            ImGui::TextColored(ImVec4(0.0f, 1.0f, 0.0f, 1.0f), "TERRAIN");
            ImGui::Separator();

            ImGui::Text("Loaded tiles: %d", terrainManager->getLoadedTileCount());

            auto currentTile = terrainManager->getCurrentTile();
            ImGui::Text("Current tile: [%d,%d]", currentTile.x, currentTile.y);

            ImGui::Spacing();
        }

        // Water info
        auto* waterRenderer = renderer->getWaterRenderer();
        if (waterRenderer) {
            ImGui::TextColored(ImVec4(0.2f, 0.5f, 1.0f, 1.0f), "WATER");
            ImGui::Separator();

            ImGui::Text("Surfaces: %d", waterRenderer->getSurfaceCount());
            ImGui::Text("Enabled: %s", waterRenderer->isEnabled() ? "YES" : "NO");

            ImGui::Spacing();
        }
    }

    // Skybox info
    if (showTerrain) {
        auto* skybox = renderer->getSkybox();
        if (skybox) {
            ImGui::TextColored(ImVec4(0.5f, 0.8f, 1.0f, 1.0f), "SKY");
            ImGui::Separator();

            float time = skybox->getTimeOfDay();
            int hours = static_cast<int>(time);
            int minutes = static_cast<int>((time - hours) * 60);

            ImGui::Text("Time: %02d:%02d", hours, minutes);
            ImGui::Text("Auto: %s", skybox->isTimeProgressionEnabled() ? "YES" : "NO");

            // Celestial info
            auto* celestial = renderer->getCelestial();
            if (celestial) {
                ImGui::Text("Sun/Moon: %s", celestial->isEnabled() ? "YES" : "NO");

                // Moon phase info
                float phase = celestial->getMoonPhase();
                const char* phaseName = "Unknown";
                if (phase < 0.0625f || phase >= 0.9375f) phaseName = "New";
                else if (phase < 0.1875f) phaseName = "Wax Cresc";
                else if (phase < 0.3125f) phaseName = "1st Qtr";
                else if (phase < 0.4375f) phaseName = "Wax Gibb";
                else if (phase < 0.5625f) phaseName = "Full";
                else if (phase < 0.6875f) phaseName = "Wan Gibb";
                else if (phase < 0.8125f) phaseName = "Last Qtr";
                else phaseName = "Wan Cresc";

                ImGui::Text("Moon: %s (%.0f%%)", phaseName, phase * 100.0f);
                ImGui::Text("Cycling: %s", celestial->isMoonPhaseCycling() ? "YES" : "NO");
            }

            // Star field info
            auto* starField = renderer->getStarField();
            if (starField) {
                ImGui::Text("Stars: %d (%s)", starField->getStarCount(),
                           starField->isEnabled() ? "ON" : "OFF");
            }

            // Cloud info
            auto* clouds = renderer->getClouds();
            if (clouds) {
                ImGui::Text("Clouds: %s (%.0f%%)",
                           clouds->isEnabled() ? "ON" : "OFF",
                           clouds->getDensity() * 100.0f);
            }

            // Lens flare info
            auto* lensFlare = renderer->getLensFlare();
            if (lensFlare) {
                ImGui::Text("Lens Flare: %s (%.0f%%)",
                           lensFlare->isEnabled() ? "ON" : "OFF",
                           lensFlare->getIntensity() * 100.0f);
            }

            ImGui::Spacing();
        }
    }

    // Weather info
    if (showRenderer) {
        auto* weather = renderer->getWeather();
        if (weather) {
            ImGui::TextColored(ImVec4(0.6f, 0.8f, 1.0f, 1.0f), "WEATHER");
            ImGui::Separator();

            const char* typeName = "None";
            using WeatherType = rendering::Weather::Type;
            auto type = weather->getWeatherType();
            if (type == WeatherType::RAIN) typeName = "Rain";
            else if (type == WeatherType::SNOW) typeName = "Snow";

            ImGui::Text("Type: %s", typeName);
            if (weather->isEnabled()) {
                ImGui::Text("Particles: %d", weather->getParticleCount());
                ImGui::Text("Intensity: %.0f%%", weather->getIntensity() * 100.0f);
            }

            ImGui::Spacing();
        }
    }

    // Fog info
    if (showRenderer) {
        auto* terrainRenderer = renderer->getTerrainRenderer();
        if (terrainRenderer) {
            ImGui::TextColored(ImVec4(0.7f, 0.8f, 0.9f, 1.0f), "FOG");
            ImGui::Separator();

            ImGui::Text("Distance fog: %s", terrainRenderer->isFogEnabled() ? "ON" : "OFF");

            ImGui::Spacing();
        }
    }

    // Character info
    if (showRenderer) {
        auto* charRenderer = renderer->getCharacterRenderer();
        if (charRenderer) {
            ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.4f, 1.0f), "CHARACTERS");
            ImGui::Separator();

            ImGui::Text("Instances: %zu", charRenderer->getInstanceCount());

            ImGui::Spacing();
        }
    }

    // WMO building info
    if (showRenderer) {
        auto* wmoRenderer = renderer->getWMORenderer();
        if (wmoRenderer) {
            ImGui::TextColored(ImVec4(0.8f, 0.7f, 0.6f, 1.0f), "WMO BUILDINGS");
            ImGui::Separator();

            ImGui::Text("Models: %u", wmoRenderer->getModelCount());
            ImGui::Text("Instances: %u", wmoRenderer->getInstanceCount());
            ImGui::Text("Triangles: %u", wmoRenderer->getTotalTriangleCount());
            ImGui::Text("Draw Calls: %u", wmoRenderer->getDrawCallCount());

            ImGui::Spacing();
        }
    }

    // Zone info
    {
        const std::string& zoneName = renderer->getCurrentZoneName();
        if (!zoneName.empty()) {
            ImGui::TextColored(ImVec4(1.0f, 0.9f, 0.3f, 1.0f), "ZONE");
            ImGui::Separator();
            ImGui::Text("%s", zoneName.c_str());
            ImGui::Spacing();
        }
    }

    // Camera info
    if (showCamera && camera) {
        ImGui::TextColored(ImVec4(1.0f, 0.5f, 0.0f, 1.0f), "CAMERA");
        ImGui::Separator();

        glm::vec3 pos = camera->getPosition();
        ImGui::Text("Pos: %.1f, %.1f, %.1f", pos.x, pos.y, pos.z);

        glm::vec3 forward = camera->getForward();
        ImGui::Text("Dir: %.2f, %.2f, %.2f", forward.x, forward.y, forward.z);

        ImGui::Spacing();
    }

    // Controls help
    if (showControls) {
        ImGui::TextColored(ImVec4(0.7f, 0.7f, 0.7f, 1.0f), "CONTROLS");
        ImGui::Separator();
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F1: Toggle HUD");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F2: Wireframe");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F3: Single tile");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F4: Culling");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F5: Stats");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F6: Multi-tile");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F7: Streaming");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F8: Water");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F9: Time");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F10: Sun/Moon");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F11: Stars");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "F12: Fog");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "+/-: Change time");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "C: Clouds");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "[/]: Density");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "L: Lens Flare");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), ",/.: Intensity");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "M: Moon Cycle");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), ";/': Moon Phase");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "W: Weather");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "</>: Wx Intensity");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "K: Spawn Character");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "J: Remove Chars");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "O: Spawn Test WMO");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "Shift+O: Real WMO");
        ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1.0f), "P: Clear WMOs");
    }

    ImGui::End();
}

} // namespace rendering
} // namespace wowee