#include "kpi_card.h"
#include "sparkline.h"
#include <imgui.h>
#include <cstdio>

void kpi_card(const char* label, float value, float delta_percent,
              const float* history, int history_count,
              const char* format) {
    ImGui::BeginGroup();

    // Label — small, muted
    ImGui::TextDisabled("%s", label);

    // Value — scaled up font
    ImGui::SetWindowFontScale(1.8f);
    char value_buf[64];
    snprintf(value_buf, sizeof(value_buf), format, value);
    ImGui::Text("%s", value_buf);
    ImGui::SetWindowFontScale(1.0f);

    // Delta badge — green up arrow / red down arrow
    const bool positive = delta_percent >= 0.0f;
    const ImVec4 delta_color = positive
        ? ImVec4(0.20f, 0.80f, 0.35f, 1.0f)   // green
        : ImVec4(0.90f, 0.25f, 0.25f, 1.0f);  // red

    char delta_buf[32];
    if (positive) {
        snprintf(delta_buf, sizeof(delta_buf), "\xe2\x96\xb2 +%.1f%%", delta_percent);
    } else {
        snprintf(delta_buf, sizeof(delta_buf), "\xe2\x96\xbc %.1f%%", delta_percent);
    }

    ImGui::PushStyleColor(ImGuiCol_Text, delta_color);
    ImGui::Text("%s", delta_buf);
    ImGui::PopStyleColor();

    // Sparkline — matches delta color
    if (history != nullptr && history_count > 0) {
        sparkline(label, history, history_count, delta_color, 120.0f, 24.0f);
    }

    ImGui::EndGroup();
}