"""Plotly helpers: consistent, theme-aware figures + CSV export for the logbook."""
import os
import numpy as np
import pandas as pd
import plotly.graph_objects as go

PALETTE = ["#4C78A8", "#F58518", "#54A24B", "#E45756", "#72B7B2", "#B279A2"]


def new_fig(title, xtitle, ytitle):
    fig = go.Figure()
    fig.update_layout(
        title=title, xaxis_title=xtitle, yaxis_title=ytitle,
        template="plotly_white", width=760, height=480,
        legend=dict(borderwidth=1, bordercolor="#ccc"),
        margin=dict(l=60, r=20, t=60, b=50),
    )
    return fig


def add_theory_sim(fig, x, theory, sim, sim_std=None, color=None, name=""):
    """Solid line = theory, markers = simulation (paper's convention)."""
    color = color or PALETTE[0]
    fig.add_trace(go.Scatter(x=x, y=theory, mode="lines", line=dict(color=color, width=2.5),
                             name=f"{name} theory"))
    err = dict(type="data", array=sim_std, visible=True) if sim_std is not None else None
    fig.add_trace(go.Scatter(x=x, y=sim, mode="markers", marker=dict(color=color, size=8,
                             symbol="circle", line=dict(color="white", width=1)),
                             error_y=err, name=f"{name} sim"))


def save(fig, df, outdir, stem):
    os.makedirs(outdir, exist_ok=True)
    html = os.path.join(outdir, stem + ".html")
    csv = os.path.join(outdir, stem + ".csv")
    fig.write_html(html, include_plotlyjs="cdn")
    df.to_csv(csv, index=False)
    print(f"  wrote {html}\n  wrote {csv}")
    return html, csv