#include "kpi_card.h"
#include "sparkline.h"
#include "core/tokens.h"
#include "core/icons_tabler.h"
#include <imgui.h>
#include <cstdio>

static void kpi_card_impl(const char* label, float value, float delta_percent,
                          const float* history, int history_count,
                          const char* format, const char* icon,
                          bool fixed_y, float y_min, float y_max) {
    using namespace fn_tokens;

    ImGui::PushStyleColor(ImGuiCol_ChildBg, colors::surface);
    ImGui::PushStyleColor(ImGuiCol_Border, colors::border);
    ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, radius::md);
    ImGui::PushStyleVar(ImGuiStyleVar_ChildBorderSize, 1.0f);
    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(spacing::sm, spacing::sm));

    char child_id[96];
    std::snprintf(child_id, sizeof(child_id), "##kpi_%s", label);

    float width = ImGui::GetContentRegionAvail().x;
    if (width < 1.0f) width = 1.0f;

    constexpr float card_height = 86.0f;
    ImGui::BeginChild(child_id, ImVec2(width, card_height),
                      ImGuiChildFlags_Borders,
                      ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse);

    const bool has_history = history != nullptr && history_count > 0;
    const bool has_delta   = delta_percent != 0.0f;

    constexpr float spark_w = 100.0f;
    constexpr float spark_h = 36.0f;

    const float inner_w = ImGui::GetContentRegionAvail().x;
    const float info_w  = has_history ? (inner_w - spark_w - spacing::sm) : inner_w;

    ImGui::BeginGroup();
    ImGui::PushItemWidth(info_w);

    ImGui::PushStyleColor(ImGuiCol_Text, colors::text_muted);
    if (icon && *icon) {
        ImGui::TextUnformatted(icon);
        ImGui::SameLine(0, spacing::xs);
    }
    ImGui::TextUnformatted(label);
    ImGui::PopStyleColor();

    ImGui::SetWindowFontScale(1.4f);
    char value_buf[64];
    std::snprintf(value_buf, sizeof(value_buf), format, value);
    ImGui::TextUnformatted(value_buf);
    ImGui::SetWindowFontScale(1.0f);

    if (has_delta) {
        const bool positive = delta_percent >= 0.0f;
        const ImVec4 delta_color = positive ? colors::success : colors::error;
        char delta_buf[48];
        if (positive) {
            std::snprintf(delta_buf, sizeof(delta_buf), TI_TRENDING_UP " +%.1f%%", delta_percent);
        } else {
            std::snprintf(delta_buf, sizeof(delta_buf), TI_TRENDING_DOWN " %.1f%%", delta_percent);
        }
        ImGui::PushStyleColor(ImGuiCol_Text, delta_color);
        ImGui::TextUnformatted(delta_buf);
        ImGui::PopStyleColor();
    } else {
        ImGui::PushStyleColor(ImGuiCol_Text, colors::text_dim);
        ImGui::TextUnformatted(TI_MINUS);
        ImGui::PopStyleColor();
    }

    ImGui::PopItemWidth();
    ImGui::EndGroup();

    if (has_history) {
        const ImVec4 spark_color = has_delta
            ? (delta_percent >= 0.0f ? colors::success : colors::error)
            : colors::primary;

        ImGui::SameLine();
        const float card_inner_h = card_height - 2.0f * spacing::sm;
        float y_offset = (card_inner_h - spark_h) * 0.5f;
        if (y_offset < 0.0f) y_offset = 0.0f;
        const float spark_x = inner_w - spark_w;
        ImGui::SetCursorPos(ImVec2(spacing::sm + spark_x, spacing::sm + y_offset));
        if (fixed_y) {
            sparkline(label, history, history_count, spark_color,
                      y_min, y_max, spark_w, spark_h);
        } else {
            sparkline(label, history, history_count, spark_color, spark_w, spark_h);
        }
    }

    ImGui::EndChild();

    ImGui::PopStyleVar(3);
    ImGui::PopStyleColor(2);
}

void kpi_card(const char* label, float value, float delta_percent,
              const float* history, int history_count,
              const char* format,
              const char* icon) {
    kpi_card_impl(label, value, delta_percent, history, history_count,
                  format, icon, /*fixed_y=*/false, 0.0f, 0.0f);
}

void kpi_card(const char* label, float value, float delta_percent,
              const float* history, int history_count,
              float y_min, float y_max,
              const char* format,
              const char* icon) {
    kpi_card_impl(label, value, delta_percent, history, history_count,
                  format, icon, /*fixed_y=*/true, y_min, y_max);
}
