// src/screens/portfolio/PortfolioFFNView.h
#pragma once
#include "screens/portfolio/PortfolioTypes.h"

#include <QAreaSeries>
#include <QChart>
#include <QChartView>
#include <QDateTimeAxis>
#include <QJsonObject>
#include <QLabel>
#include <QLineSeries>
#include <QPointer>
#include <QPushButton>
#include <QStackedWidget>
#include <QTabWidget>
#include <QTableWidget>
#include <QValueAxis>
#include <QWidget>

namespace fincept::screens {

/// FFN (Financial Functions) analytics view with 6 sub-tabs.
/// Uses Python ffn library via PortfolioAnalyticsService (D1/P6 compliant).
class PortfolioFFNView : public QWidget {
    Q_OBJECT
  public:
    explicit PortfolioFFNView(QWidget* parent = nullptr);

    void set_data(const portfolio::PortfolioSummary& summary, const QString& currency);

    /// Benchmark (SPY) daily closes — feeds the BENCHMARK column of the
    /// Overview and Benchmark tables (stats computed natively in C++).
    void set_benchmark(const QVector<double>& closes);

  signals:
    void back_requested();

  protected:
    void changeEvent(QEvent* event) override;

  private:
    void build_ui();
    void retranslateUi();

    // Per-tab update methods
    void update_overview();
    void update_benchmark();
    void update_optimization();
    void update_rebased();
    void update_drawdowns();
    void update_rolling();

    void run_ffn();

    /// Creates a dark-themed QChartView with an amber title.
    QChartView* make_chart_view(const QString& title);

    // ── Header ────────────────────────────────────────────────────────────────
    QPushButton* back_btn_ = nullptr;
    QPushButton* run_btn_ = nullptr;
    QLabel* status_label_ = nullptr;
    QLabel* title_label_ = nullptr;

    // ── Tab container ─────────────────────────────────────────────────────────
    QTabWidget* tabs_ = nullptr;

    // Section headers — kept so retranslateUi can refresh them after a language
    // switch without rebuilding the entire view.
    QLabel* overview_hdr_ = nullptr;
    QLabel* benchmark_hdr_ = nullptr;
    QLabel* optimization_hdr_ = nullptr;
    QLabel* weights_hdr_ = nullptr;
    QLabel* stats_hdr_ = nullptr;

    // Placeholder labels shown until run_ffn() has produced data.
    QLabel* opt_placeholder_ = nullptr;
    QLabel* rebased_placeholder_ = nullptr;
    QLabel* drawdowns_placeholder_ = nullptr;
    QLabel* rolling_placeholder_ = nullptr;

    // ── Overview tab ──────────────────────────────────────────────────────────
    QTableWidget* overview_table_ = nullptr;

    // ── Benchmark tab ─────────────────────────────────────────────────────────
    QWidget* benchmark_panel_ = nullptr;
    QTableWidget* benchmark_table_ = nullptr;
    QLabel* benchmark_info_label_ = nullptr;

    // ── Optimisation tab ──────────────────────────────────────────────────────
    QWidget* optimization_panel_ = nullptr;
    QStackedWidget* opt_stack_ = nullptr; // 0=placeholder, 1=tables
    QTableWidget* opt_weights_table_ = nullptr;
    QTableWidget* opt_stats_table_ = nullptr;

    // ── Rebased tab ───────────────────────────────────────────────────────────
    QWidget* rebased_panel_ = nullptr;
    QStackedWidget* rebased_stack_ = nullptr; // 0=placeholder, 1=chart
    QChartView* rebased_chart_view_ = nullptr;

    // ── Drawdowns tab ─────────────────────────────────────────────────────────
    QWidget* drawdowns_panel_ = nullptr;
    QStackedWidget* drawdowns_stack_ = nullptr;
    QChartView* drawdowns_chart_view_ = nullptr;

    // ── Rolling correlations tab ──────────────────────────────────────────────
    QWidget* rolling_panel_ = nullptr;
    QStackedWidget* rolling_stack_ = nullptr;
    QChartView* rolling_chart_view_ = nullptr;

    // ── State ─────────────────────────────────────────────────────────────────
    portfolio::PortfolioSummary summary_;
    QString currency_;
    QJsonObject ffn_data_;
    QVector<double> benchmark_closes_; // SPY daily closes (1y), via set_benchmark()
};

} // namespace fincept::screens