// panel_dashboard.cpp — KPI grid using kpi_card + sparkline from the registry.
#include "panels.h"
#include "core/icons_tabler.h"
#include "viz/kpi_card.h"
#include "viz/sparkline.h"

#include <imgui.h>
#include <map>
#include <string>

namespace kanban_cpp {

namespace {

float pct_by_status(const std::vector<Card>& cards, const std::string& status) {
    if (cards.empty()) return 0.0f;
    int hits = 0;
    for (const auto& c : cards) if (c.status == status) ++hits;
    return 100.0f * static_cast<float>(hits) / static_cast<float>(cards.size());
}

} // namespace

void draw_dashboard(AppState& s, bool* p_open) {
    if (!ImGui::Begin(TI_DASHBOARD " Dashboard", p_open)) {
        ImGui::End();
        return;
    }

    ImGui::TextDisabled("KPIs sinteticos (TODO: backend /api/stats endpoint)");
    ImGui::Separator();

    // Snapshot counts
    int total = static_cast<int>(s.cards.size());
    std::map<std::string, int> by_priority;
    std::map<std::string, int> by_status;
    for (const auto& c : s.cards) {
        if (!c.priority.empty()) by_priority[c.priority]++;
        if (!c.status.empty())   by_status[c.status]++;
    }

    // Fake history for sparkline — until backend wires real time-series.
    static float hist_total[12] = {3,4,5,5,7,8,9,8,10,11,12,13};
    static float hist_doing[12] = {1,1,2,2,3,3,4,4,5,5,6,6};

    // KPI grid (use Columns for a quick 3-up layout)
    ImGui::Columns(3, "##kpi_cols", false);

    kpi_card("Total cards", static_cast<float>(total), 0.0f,
             hist_total, 12, "%.0f", TI_LAYOUT_KANBAN);
    ImGui::NextColumn();

    kpi_card("Doing now", static_cast<float>(by_status["doing"]), 0.0f,
             hist_doing, 12, "%.0f", TI_PLAYER_PLAY);
    ImGui::NextColumn();

    kpi_card("Critical", static_cast<float>(by_priority["critical"]), 0.0f,
             nullptr, 0, "%.0f", TI_FLAG);

    ImGui::Columns(1);
    ImGui::Separator();

    // Status breakdown
    ImGui::Text("Status breakdown");
    for (const auto& kv : by_status) {
        ImGui::Text("  %-12s  %d", kv.first.c_str(), kv.second);
    }

    ImGui::End();
}

} // namespace kanban_cpp