// panel_board.cpp — columns + cards Kanban panel.
#include "panels.h"
#include "core/icons_tabler.h"

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

namespace kanban_cpp {

void refresh_data(AppState& s) {
    std::string err;
    auto cards   = list_cards(s.cfg, err);
    std::string err_cards = err; err.clear();
    auto columns = list_columns(s.cfg, err);
    std::string err_cols = err;
    bool ok = health(s.cfg);
    int64_t ts = std::time(nullptr);
    std::lock_guard<std::mutex> lock(s.mu);
    s.cards   = std::move(cards);
    s.columns = std::move(columns);
    s.last_refresh_error.clear();
    if (!err_cards.empty()) s.last_refresh_error  = "cards: "    + err_cards;
    if (!err_cols.empty())  s.last_refresh_error += " columns: " + err_cols;
    s.backend_ok      = ok;
    s.last_refresh_ts = ts;
}

void draw_board(AppState& s, bool* p_open) {
    if (!ImGui::Begin(TI_LAYOUT_KANBAN " Board", p_open)) {
        ImGui::End();
        return;
    }

    // Snapshot bajo lock — refresh corre en thread separado.
    std::vector<Card>   cards_snap;
    std::vector<Column> cols_snap;
    bool backend_ok_snap;
    std::string err_snap;
    std::string sse_snap;
    {
        std::lock_guard<std::mutex> lock(s.mu);
        cards_snap = s.cards;
        cols_snap  = s.columns;
        backend_ok_snap = s.backend_ok;
        err_snap = s.last_refresh_error;
        sse_snap = s.sse_status;
    }

    // Toolbar — refresh corre en thread separado (no bloquea frame).
    if (ImGui::Button(TI_REFRESH " Refresh")) {
        std::thread([&s](){ refresh_data(s); }).detach();
    }
    ImGui::SameLine();
    if (backend_ok_snap) {
        ImGui::TextColored(ImVec4(0.4f, 0.85f, 0.4f, 1.0f), TI_CHECK " backend :8403");
    } else {
        ImGui::TextColored(ImVec4(0.85f, 0.4f, 0.4f, 1.0f), TI_ALERT_TRIANGLE " backend offline (:8403)");
    }

    // SSE live badge — refleja el estado del stream push del backend.
    ImGui::SameLine();
    if (sse_snap == "connected") {
        ImGui::TextColored(ImVec4(0.4f, 0.85f, 0.4f, 1.0f), TI_BROADCAST " live");
    } else if (sse_snap == "connecting") {
        ImGui::TextColored(ImVec4(0.85f, 0.85f, 0.4f, 1.0f), TI_LOADER " connecting");
    } else if (sse_snap == "disconnected") {
        ImGui::TextColored(ImVec4(0.85f, 0.4f, 0.4f, 1.0f), TI_PLUG_CONNECTED_X " disconnected");
    } else {
        // "error: <msg>" o cualquier otro string
        ImGui::TextColored(ImVec4(0.85f, 0.4f, 0.4f, 1.0f), TI_PLUG_CONNECTED_X " %s", sse_snap.c_str());
    }

    if (!err_snap.empty()) {
        ImGui::SameLine();
        ImGui::TextColored(ImVec4(0.85f, 0.6f, 0.2f, 1.0f), "%s", err_snap.c_str());
    }
    ImGui::Separator();

    // Empty state
    if (cols_snap.empty()) {
        ImGui::TextDisabled("No columns yet. Pulsa Refresh o lanza el backend en :8403.");
        ImGui::End();
        return;
    }

    // Render columns left-to-right
    const float col_w = 280.0f;
    if (ImGui::BeginChild("##board_scroll", ImVec2(0, 0), false,
                          ImGuiWindowFlags_HorizontalScrollbar)) {
        for (size_t ci = 0; ci < cols_snap.size(); ++ci) {
            const auto& col = cols_snap[ci];
            ImGui::SameLine();
            ImGui::BeginChild((std::string("##col_") + col.id).c_str(),
                              ImVec2(col_w, 0), true);
            ImGui::TextUnformatted(col.name.c_str());
            ImGui::SameLine();
            int count = 0;
            for (const auto& c : cards_snap) if (c.column_id == col.id) ++count;
            ImGui::TextDisabled("(%d)", count);
            ImGui::Separator();

            for (const auto& card : cards_snap) {
                if (card.column_id != col.id) continue;
                ImGui::PushID(card.id.c_str());
                ImGui::BeginChild("##card", ImVec2(0, 70), true,
                                  ImGuiWindowFlags_NoScrollbar);
                ImGui::TextUnformatted(card.title.c_str());
                if (!card.priority.empty()) {
                    ImVec4 col_p(0.6f, 0.6f, 0.6f, 1);
                    if      (card.priority == "high")     col_p = {0.95f, 0.55f, 0.2f, 1};
                    else if (card.priority == "critical") col_p = {0.95f, 0.25f, 0.25f, 1};
                    else if (card.priority == "low")      col_p = {0.45f, 0.7f, 0.95f, 1};
                    ImGui::TextColored(col_p, TI_FLAG " %s", card.priority.c_str());
                }
                if (!card.assignee.empty()) {
                    ImGui::SameLine();
                    ImGui::TextDisabled(TI_USER " %s", card.assignee.c_str());
                }
                ImGui::EndChild();
                if (ImGui::IsItemHovered() && ImGui::IsItemClicked(ImGuiMouseButton_Right)) {
                    ImGui::OpenPopup("##card_ctx");
                }
                if (ImGui::BeginPopup("##card_ctx")) {
                    ImGui::TextDisabled("Move to:");
                    for (const auto& tgt : cols_snap) {
                        if (tgt.id == card.column_id) continue;
                        if (ImGui::MenuItem(tgt.name.c_str())) {
                            std::thread([&s, card_id=card.id, tgt_id=tgt.id](){
                                std::string err;
                                if (!move_card(s.cfg, card_id, tgt_id, err)) {
                                    std::lock_guard<std::mutex> lock(s.mu);
                                    s.last_refresh_error = "move: " + err;
                                    return;
                                }
                                refresh_data(s);
                            }).detach();
                        }
                    }
                    ImGui::Separator();
                    if (ImGui::MenuItem(TI_PLAYER_PLAY " Launch agent workflow")) {
                        std::string run_id, err;
                        if (!launch_workflow(s.cfg, card.id, run_id, err))
                            s.last_refresh_error = "launch: " + err;
                    }
                    ImGui::EndPopup();
                }
                ImGui::PopID();
            }
            ImGui::EndChild();
        }
    }
    ImGui::EndChild();

    ImGui::End();
}

} // namespace kanban_cpp