#include <ctime>
#include <imgui.h>

#include "../misc.h"
#include "../log.h"
#include "logs.h"

static inline void render_table(ImFont* monospace_font, bool* autoscrolling) {
    ImGui::TableSetupScrollFreeze(0, 1);
    ImGui::TableSetupColumn("Time", ImGuiTableColumnFlags_None);
    ImGui::TableSetupColumn("Message", ImGuiTableColumnFlags_None);
    ImGui::TableHeadersRow();

    ImGui::PushFont(monospace_font);

    ImGuiListClipper clipper;
    clipper.Begin(static_cast<int>(log_entries.size()));
    while (clipper.Step()) {
        for (int i_u = clipper.DisplayStart; i_u < clipper.DisplayEnd; i_u++) {
            // what'd we do if we log the error about an error failing to show logs
            assert(i_u >= 0);
            size_t i = static_cast<size_t>(i_u);

            const LogEntry* log_entry = &log_entries[i];
            struct tm tm;
            char time_as_str[128] = {0};
            strftime(time_as_str, 127 * sizeof(char), "%c", localtime_r(&log_entry->time, &tm));

            ImGui::TableNextRow();
            if (ImGui::TableSetColumnIndex(0)) ImGui::TextUnformatted(time_as_str);
            if (ImGui::TableSetColumnIndex(1)) ImGui::TextUnformatted(log_entry->message);
        }
    }
    clipper.End();

    ImGui::PopFont();

    if (ImGui::GetScrollY() >= ImGui::GetScrollMaxY()) {
        *autoscrolling = true;
        ImGui::SetScrollHereY(1.0f);
    }

    ImGui::EndTable();
}

void logs_window(ImFont* monospace_font, bool* autoscrolling, bool* p_open) {
    if (!ImGui::Begin("LogMeow Logs", p_open)) {
        ImGui::End();
        return;
    }

    if (ImGui::Button("Clear")) {
        log_entries.clear();
    }
    ImGui::SameLine();
    if (ImGui::Button("Copy")) {
        std::string text;
        for (const LogEntry& entry : log_entries) {
            if (!text.empty()) {
                text += '\n';
            }
            text += format_log(entry);
        }
        ImGui::SetClipboardText(text.c_str());
    }

    ImGui::Separator();
    // copied from imgui/imgui_demo.cpp: [SECTION] Example App: Debug Console / ShowExampleAppConsole()
    // and [SECTION] Example App: Long Text / ShowExampleAppLongText()
    // and [SECTION] Example App: Debug Log / ShowExampleAppLog()
    // and Tables/Vertical scrolling, with clipping
    const constexpr ImGuiTableFlags flags = ImGuiTableFlags_ScrollY | ImGuiTableFlags_ScrollX | ImGuiTableFlags_RowBg | ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersV | ImGuiTableFlags_Resizable | ImGuiTableFlags_Reorderable | ImGuiTableFlags_Hideable;
    if (ImGui::BeginTable("logs", 2, flags)) {
        render_table(monospace_font, autoscrolling);
    }
    ImGui::End();
}