// tab_joins — 2 tablas (orders + customers) pasadas a data_table::render.
// Demuestra la UI de joins del modulo: drag 'customers' chip → canvas.
// Issue 0108 fase 2.
#include "tabs.h"
#include "qa_state.h"
#include "data_table/data_table.h"
#include <imgui.h>
#include <string>
#include <vector>

namespace tables_qa::tabs {

namespace {

// ---------------------------------------------------------------------------
// Backing storage — dos tablas independientes.
// ---------------------------------------------------------------------------
struct JoinsState {
    // orders: order_id, customer_id, amount, status
    std::vector<std::string> orders_back = {
        "1001", "C01", "250.00",  "shipped",
        "1002", "C02", "89.99",   "pending",
        "1003", "C01", "540.50",  "delivered",
        "1004", "C03", "12.00",   "cancelled",
        "1005", "C04", "310.75",  "shipped",
        "1006", "C02", "75.00",   "pending",
        "1007", "C05", "1200.00", "delivered",
        "1008", "C01", "43.20",   "shipped",
        "1009", "C03", "920.00",  "processing",
        "1010", "C04", "67.80",   "cancelled",
    };
    std::vector<const char*> orders_ptrs;

    // customers: customer_id, name, country, vip_level
    std::vector<std::string> customers_back = {
        "C01", "Alice Romero",  "ES", "gold",
        "C02", "Bob Chen",      "US", "silver",
        "C03", "Carla Müller",  "DE", "bronze",
        "C04", "David Okafor",  "NG", "gold",
        "C05", "Eva Lindqvist", "SE", "silver",
    };
    std::vector<const char*> customers_ptrs;

    data_table::State dt;
    std::vector<data_table::TableEvent> last_events;

    bool seeded = false;
};

JoinsState g_jst;

void seed(JoinsState& s) {
    s.orders_ptrs.clear();
    for (auto& v : s.orders_back)    s.orders_ptrs.push_back(v.c_str());
    s.customers_ptrs.clear();
    for (auto& v : s.customers_back) s.customers_ptrs.push_back(v.c_str());
    s.seeded = true;
}

} // anon

// ---------------------------------------------------------------------------

void render_joins() {
    if (!g_jst.seeded) seed(g_jst);

    // --- Controls bar -------------------------------------------------------
    ImGui::TextDisabled(
        "Drag 'customers' table from chips bar into the canvas to join.");

    ImGui::Spacing();

    // JoinStrategy selector — display only; the module handles the actual join.
    static int s_strategy = 0; // 0=Left 1=Inner 2=Right 3=Full
    const char* strategies[] = { "Left", "Inner", "Right", "Full" };
    ImGui::SetNextItemWidth(120.0f);
    ImGui::Combo("Join strategy", &s_strategy, strategies, 4);
    ImGui::SameLine();
    ImGui::TextDisabled("(display only — use the module join UI to apply)");

    ImGui::Spacing();

    if (ImGui::Button("Reset join state")) {
        g_jst.dt = data_table::State{};
    }

    ImGui::Spacing();
    ImGui::Separator();
    ImGui::Spacing();

    // --- Build TableInputs --------------------------------------------------

    // Main table: orders
    data_table::TableInput orders_tbl;
    orders_tbl.name    = "orders";
    orders_tbl.headers = { "order_id", "customer_id", "amount", "status" };
    orders_tbl.types   = {
        data_table::ColumnType::Int,
        data_table::ColumnType::String,
        data_table::ColumnType::Float,
        data_table::ColumnType::String,
    };
    orders_tbl.cells = g_jst.orders_ptrs.data();
    orders_tbl.rows  = 10;
    orders_tbl.cols  = 4;
    orders_tbl.column_specs.resize(orders_tbl.cols);
    for (int i = 0; i < orders_tbl.cols; i++)
        orders_tbl.column_specs[i].id = orders_tbl.headers[i];

    // Secondary table: customers (joinable)
    data_table::TableInput customers_tbl;
    customers_tbl.name    = "customers";
    customers_tbl.headers = { "customer_id", "name", "country", "vip_level" };
    customers_tbl.types   = {
        data_table::ColumnType::String,
        data_table::ColumnType::String,
        data_table::ColumnType::String,
        data_table::ColumnType::String,
    };
    customers_tbl.cells = g_jst.customers_ptrs.data();
    customers_tbl.rows  = 5;
    customers_tbl.cols  = 4;
    customers_tbl.column_specs.resize(customers_tbl.cols);
    for (int i = 0; i < customers_tbl.cols; i++)
        customers_tbl.column_specs[i].id = customers_tbl.headers[i];

    // --- Render -------------------------------------------------------------
    ImGui::BeginChild("##joins_host", ImVec2(-1, -1));
    g_jst.last_events.clear();
    data_table::render("##joins_tbl",
                       { orders_tbl, customers_tbl },
                       g_jst.dt,
                       &g_jst.last_events,
                       /*show_chrome=*/true);
    ImGui::EndChild();
    qa::consume_events(g_jst.last_events);
}

} // namespace tables_qa::tabs