app.py

# app_ucs.py — ST_GeoMech_UCS (Unified workflow like Tc) — MAPE instead of MAE

import io, json, os, base64, math
from pathlib import Path
import streamlit as st
import pandas as pd
import numpy as np
import joblib
from datetime import datetime

# Matplotlib (preview + cross-plot)
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
from matplotlib.ticker import FuncFormatter

import plotly.graph_objects as go
from sklearn.metrics import mean_squared_error  # MAE removed

# =========================
# Constants / Defaults
# =========================
APP_NAME = "ST_GeoMech_UCS"
TAGLINE  = "Real-Time Unconfined Compressive Strength Tracking While Drilling"

# Default features standardized to match Ts/Tc apps.
# (Older headers are still accepted via alias map below.)
FEATURES = [
    "WOB (klbf)",
    "Torque (kft.lbf)",
    "SPP (psi)",
    "RPM (1/min)",
    "ROP (ft/h)",
    "Flow Rate (gpm)",
]
TARGET    = "UCS"
PRED_COL  = "UCS_Pred"

MODELS_DIR = Path("models")
DEFAULT_MODEL = MODELS_DIR / "ucs_rf.joblib"
MODEL_FALLBACKS = [MODELS_DIR / "model.joblib", MODELS_DIR / "model.pkl"]
COLORS = {"pred": "#1f77b4", "actual": "#f2b702", "ref": "#5a5a5a"}

STRICT_VERSION_CHECK = False  # optional env banner

# ---- Plot sizing ----
CROSS_W = 350
CROSS_H = 350
TRACK_H = 1000
TRACK_W = 600
FONT_SZ = 13
BOLD_FONT = "Arial Black, Arial, sans-serif"

# =========================
# Page / CSS
# =========================
st.set_page_config(page_title=APP_NAME, page_icon="logo.png", layout="wide")
st.markdown("""
<style>
 .brand-logo { width: 200px; height: auto; object-fit: contain; }
 .centered-container { display: flex; flex-direction: column; align-items: center; text-align: center; }
 .st-message-box { background-color: #f0f2f6; color: #333; padding: 10px; border-radius: 10px; border: 1px solid #e6e9ef; }
 .st-message-box.st-success { background-color: #d4edda; color: #155724; border-color: #c3e6cb; }
 .st-message-box.st-warning { background-color: #fff3cd; color: #856404; border-color: #ffeeba; }
 .st-message-box.st-error   { background-color: #f8d7da; color: #721c24; border-color: #f5c6cb; }

 .main .block-container { overflow: unset !important; }
 div[data-testid="stVerticalBlock"] { overflow: unset !important; }

 /* Sticky expander & tab header inside preview modal */
 div[data-testid="stExpander"] > details > summary {
   position: sticky; top: 0; z-index: 10; background: #fff; border-bottom: 1px solid #eee;
 }
 div[data-testid="stExpander"] div[data-baseweb="tab-list"] {
   position: sticky; top: 42px; z-index: 9; background: #fff; padding-top: 6px;
 }
</style>
""", unsafe_allow_html=True)

TABLE_CENTER_CSS = [
    dict(selector="th", props=[("text-align", "center")]),
    dict(selector="td", props=[("text-align", "center")]),
]

# =========================
# Password gate
# =========================
def inline_logo(path="logo.png") -> str:
    try:
        p = Path(path)
        if not p.exists(): return ""
        return f"data:image/png;base64,{base64.b64encode(p.read_bytes()).decode('ascii')}"
    except Exception:
        return ""

def add_password_gate() -> None:
    try:
        required = st.secrets.get("APP_PASSWORD", "")
    except Exception:
        required = os.environ.get("APP_PASSWORD", "")

    if not required:
        st.warning("Set APP_PASSWORD in Secrets (or environment) and restart.")
        st.stop()

    if st.session_state.get("auth_ok", False):
        return

    st.sidebar.markdown(f"""
        <div class="centered-container">
            <img src="{inline_logo('logo.png')}" style="width: 200px; height: auto; object-fit: contain;">
            <div style='font-weight:800;font-size:1.2rem; margin-top: 10px;'>{APP_NAME}</div>
            <div style='color:#667085;'>Smart Thinking • Secure Access</div>
        </div>
        """, unsafe_allow_html=True
    )
    pwd = st.sidebar.text_input("Access key", type="password", placeholder="••••••••")
    if st.sidebar.button("Unlock", type="primary"):
        if pwd == required:
            st.session_state.auth_ok = True
            st.rerun()
        else:
            st.error("Incorrect key.")
    st.stop()

add_password_gate()

# =========================
# Utilities
# =========================
def rmse(y_true, y_pred) -> float:
    return float(np.sqrt(mean_squared_error(y_true, y_pred)))

def pearson_r(y_true, y_pred) -> float:
    a = np.asarray(y_true, dtype=float)
    p = np.asarray(y_pred, dtype=float)
    if a.size < 2: return float("nan")
    if np.all(a == a[0]) or np.all(p == p[0]): return float("nan")
    return float(np.corrcoef(a, p)[0, 1])

def mape(y_true, y_pred, eps: float = 1e-8) -> float:
    """
    Mean Absolute Percentage Error in PERCENT.
    Ignores rows where |y_true| < eps to avoid division blowups.
    """
    a = np.asarray(y_true, dtype=float)
    p = np.asarray(y_pred, dtype=float)
    denom = np.where(np.abs(a) < eps, np.nan, np.abs(a))
    pct = np.abs(a - p) / denom * 100.0
    val = np.nanmean(pct)
    return float(val) if np.isfinite(val) else float("nan")

@st.cache_resource(show_spinner=False)
def load_model(model_path: str):
    return joblib.load(model_path)

@st.cache_data(show_spinner=False)
def parse_excel(data_bytes: bytes):
    bio = io.BytesIO(data_bytes)
    xl = pd.ExcelFile(bio)
    return {sh: xl.parse(sh) for sh in xl.sheet_names}

def read_book_bytes(b: bytes):
    return parse_excel(b) if b else {}

# ---- Canonical feature aliasing (accept legacy headers) ----
def _build_alias_map(canonical_features: list[str], target_name: str) -> dict:
    """
    Map common header variants -> canonical names (from meta FEATURES).
    """
    def pick(expected_list, variants):
        for v in variants:
            if v in expected_list:
                return v
        return variants[0]

    can_WOB    = pick(canonical_features, ["WOB (klbf)", "WOB, klbf", "WOB(klbf)", "WOB( klbf)"])
    can_TORQUE = pick(canonical_features, ["Torque (kft.lbf)", "Torque(kft.lbf)", "T (kft.lbf)", "TORQUE(kft.lbf)"])
    can_SPP    = pick(canonical_features, ["SPP (psi)", "SPP(psi)"])
    can_RPM    = pick(canonical_features, ["RPM (1/min)", "RPM(1/min)"])
    can_ROP    = pick(canonical_features, ["ROP (ft/h)", "ROP(ft/h)"])
    can_FR     = pick(canonical_features, ["Flow Rate (gpm)", "Q, gpm", "Flow Rate, gpm", "Flow Rate,gpm", "Flow Rate , gpm"])
    can_DEPTH  = "Depth (ft)"

    alias = {
        # Features
        "WOB (klbf)": can_WOB, "WOB, klbf": can_WOB, "WOB(klbf)": can_WOB, "WOB( klbf)": can_WOB,
        "Torque (kft.lbf)": can_TORQUE, "Torque(kft.lbf)": can_TORQUE, "T (kft.lbf)": can_TORQUE, "TORQUE(kft.lbf)": can_TORQUE,
        "SPP (psi)": can_SPP, "SPP(psi)": can_SPP,
        "RPM (1/min)": can_RPM, "RPM(1/min)": can_RPM,
        "ROP (ft/h)": can_ROP, "ROP(ft/h)": can_ROP,
        "Flow Rate (gpm)": can_FR, "Q, gpm": can_FR, "Flow Rate, gpm": can_FR, "Flow Rate,gpm": can_FR, "Flow Rate , gpm": can_FR,

        # Depth (plot only)
        "Depth (ft)": can_DEPTH, "Depth, ft": can_DEPTH, "Depth(ft)": can_DEPTH, "DEPTH, ft": can_DEPTH,

        # Target aliases
        "UCS": target_name,
        "UCS (psi)": target_name,
        "UCS_Actual": target_name,
    }
    return alias

def _normalize_columns(df: pd.DataFrame, canonical_features: list[str], target_name: str) -> pd.DataFrame:
    out = df.copy()
    out.columns = [str(c).strip().replace(" ,", ",").replace(",  ", ", ").replace("  ", " ") for c in out.columns]
    alias = _build_alias_map(canonical_features, target_name)
    actual = {k: v for k, v in alias.items() if k in out.columns and k != v}
    return out.rename(columns=actual)

def ensure_cols(df: pd.DataFrame, cols: list[str]) -> bool:
    miss = [c for c in cols if c not in df.columns]
    if miss:
        st.error(f"Missing columns: {miss}\nFound: {list(df.columns)}")
        return False
    return True

def find_sheet(book, names):
    low2orig = {k.lower(): k for k in book.keys()}
    for nm in names:
        if nm.lower() in low2orig: return low2orig[nm.lower()]
    return None

def _nice_tick0(xmin: float, step: int = 100) -> float:
    return step * math.floor(xmin / step) if np.isfinite(xmin) else xmin

def df_centered_rounded(df: pd.DataFrame, hide_index=True):
    out = df.copy()
    numcols = out.select_dtypes(include=[np.number]).columns
    styler = (
        out.style
           .format({c: "{:.2f}" for c in numcols})
           .set_properties(**{"text-align": "center"})
           .set_table_styles(TABLE_CENTER_CSS)
    )
    st.dataframe(styler, use_container_width=True, hide_index=hide_index)

# ---------- Build X exactly as trained ----------
def _make_X(df: pd.DataFrame, features: list[str]) -> pd.DataFrame:
    X = df.reindex(columns=features, copy=False)
    for c in features:
        X[c] = pd.to_numeric(X[c], errors="coerce")
    return X

# === Excel export helpers =================================================
def _excel_engine() -> str:
    try:
        import xlsxwriter  # noqa: F401
        return "xlsxwriter"
    except Exception:
        return "openpyxl"

def _excel_safe_name(name: str) -> str:
    bad = '[]:*?/\\'
    safe = ''.join('_' if ch in bad else ch for ch in str(name))
    return safe[:31]

def _round_numeric(df: pd.DataFrame, ndigits: int = 2) -> pd.DataFrame:
    out = df.copy()
    for c in out.columns:
        if pd.api.types.is_float_dtype(out[c]) or pd.api.types.is_integer_dtype(out[c]):
            out[c] = pd.to_numeric(out[c], errors="coerce").round(ndigits)
    return out

def _summary_table(df: pd.DataFrame, cols: list[str]) -> pd.DataFrame:
    cols = [c for c in cols if c in df.columns]
    if not cols:
        return pd.DataFrame()
    tbl = (df[cols]
            .agg(['min','max','mean','std'])
            .T.rename(columns={"min":"Min","max":"Max","mean":"Mean","std":"Std"})
            .reset_index(names="Field"))
    return _round_numeric(tbl)

def _train_ranges_df(ranges: dict[str, tuple[float, float]]) -> pd.DataFrame:
    if not ranges:
        return pd.DataFrame()
    df = pd.DataFrame(ranges).T.reset_index()
    df.columns = ["Feature", "Min", "Max"]
    return _round_numeric(df)

def _available_sections() -> list[str]:
    res = st.session_state.get("results", {})
    sections = []
    if "Train" in res:        sections += ["Training","Training_Metrics","Training_Summary"]
    if "Test" in res:         sections += ["Testing","Testing_Metrics","Testing_Summary"]
    if "Validate" in res:     sections += ["Validation","Validation_Metrics","Validation_Summary","Validation_OOR"]
    if "PredictOnly" in res:  sections += ["Prediction","Prediction_Summary"]
    if st.session_state.get("train_ranges"): sections += ["Training_Ranges"]
    sections += ["Info"]
    return sections

def build_export_workbook(selected: list[str] | None = None) -> tuple[bytes|None, str|None, list[str]]:
    res = st.session_state.get("results", {})
    if not res: return None, None, []

    sheets: dict[str, pd.DataFrame] = {}
    order: list[str] = []

    # Training
    if ("Training" in (selected or _available_sections())) and "Train" in res:
        tr = _round_numeric(res["Train"])
        sheets["Training"] = tr; order.append("Training")
        m = res.get("m_train", {})
        if m:
            sheets["Training_Metrics"] = _round_numeric(pd.DataFrame([m])); order.append("Training_Metrics")
        tr_cols = FEATURES + [c for c in [TARGET, PRED_COL] if c in tr.columns]
        s = _summary_table(tr, tr_cols)
        if not s.empty:
            sheets["Training_Summary"] = s; order.append("Training_Summary")

    # Testing
    if ("Testing" in (selected or _available_sections())) and "Test" in res:
        te = _round_numeric(res["Test"])
        sheets["Testing"] = te; order.append("Testing")
        m = res.get("m_test", {})
        if m:
            sheets["Testing_Metrics"] = _round_numeric(pd.DataFrame([m])); order.append("Testing_Metrics")
        te_cols = FEATURES + [c for c in [TARGET, PRED_COL] if c in te.columns]
        s = _summary_table(te, te_cols)
        if not s.empty:
            sheets["Testing_Summary"] = s; order.append("Testing_Summary")

    # Validation
    if ("Validation" in (selected or _available_sections())) and "Validate" in res:
        va = _round_numeric(res["Validate"])
        sheets["Validation"] = va; order.append("Validation")
        m = res.get("m_val", {})
        if m:
            sheets["Validation_Metrics"] = _round_numeric(pd.DataFrame([m])); order.append("Validation_Metrics")
        sv = res.get("sv_val", {})
        if sv:
            sheets["Validation_Summary"] = _round_numeric(pd.DataFrame([sv])); order.append("Validation_Summary")
        oor_tbl = res.get("oor_tbl")
        if oor_tbl is not None and isinstance(oor_tbl, pd.DataFrame) and not oor_tbl.empty:
            sheets["Validation_OOR"] = _round_numeric(oor_tbl.reset_index(drop=True)); order.append("Validation_OOR")

    # Prediction
    if ("Prediction" in (selected or _available_sections())) and "PredictOnly" in res:
        pr = _round_numeric(res["PredictOnly"])
        sheets["Prediction"] = pr; order.append("Prediction")
        sv = res.get("sv_pred", {})
        if sv:
            sheets["Prediction_Summary"] = _round_numeric(pd.DataFrame([sv])); order.append("Prediction_Summary")

    # Ranges
    tr_ranges = st.session_state.get("train_ranges")
    if ("Training_Ranges" in (selected or _available_sections())) and tr_ranges:
        rr = _train_ranges_df(tr_ranges)
        if not rr.empty:
            sheets["Training_Ranges"] = rr; order.append("Training_Ranges")

    # Info
    info = pd.DataFrame([
        {"Key": "AppName",    "Value": APP_NAME},
        {"Key": "Tagline",    "Value": TAGLINE},
        {"Key": "Target",     "Value": TARGET},
        {"Key": "PredColumn", "Value": PRED_COL},
        {"Key": "Features",   "Value": ", ".join(FEATURES)},
        {"Key": "ExportedAt", "Value": datetime.now().strftime("%Y-%m-%d %H:%M:%S")},
    ])
    sheets["Info"] = info; order.append("Info")

    bio = io.BytesIO()
    with pd.ExcelWriter(bio, engine=_excel_engine()) as writer:
        for name in order:
            df = sheets[name]
            df.to_excel(writer, sheet_name=_excel_safe_name(name), index=False)
    bio.seek(0)

    fname = f"UCS_Export_{datetime.now().strftime('%Y%m%d_%H%M%S')}.xlsx"
    return bio.getvalue(), fname, order

def render_export_button(phase_key: str) -> None:
    res = st.session_state.get("results", {})
    if not res: return
    st.divider()
    st.markdown("### Export to Excel")

    options = _available_sections()
    selected_sheets = st.multiselect(
        "Sheets to include",
        options=options,
        default=[],
        placeholder="Choose option(s)",
        help="Pick the sheets you want to include in the Excel export.",
        key=f"sheets_{phase_key}",
    )

    if not selected_sheets:
        st.caption("Select one or more sheets above to enable the export.")
        st.download_button(
            label="⬇️ Export Excel",
            data=b"",
            file_name="UCS_Export.xlsx",
            mime="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            disabled=True,
            key=f"download_{phase_key}",
        )
        return

    data, fname, names = build_export_workbook(selected=selected_sheets)
    if names:
        st.caption("Will include: " + ", ".join(names))
    st.download_button(
        "⬇️ Export Excel",
        data=(data or b""),
        file_name=(fname or "UCS_Export.xlsx"),
        mime="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
        disabled=(data is None),
        key=f"download_{phase_key}",
    )

# =========================
# Cross plot (Matplotlib)
# =========================
def cross_plot_static(actual, pred):
    a = pd.Series(actual, dtype=float)
    p = pd.Series(pred, dtype=float)

    lo = float(min(a.min(), p.min()))
    hi = float(max(a.max(), p.max()))
    pad = 0.03 * (hi - lo if hi > lo else 1.0)
    lo2, hi2 = lo - pad, hi + pad
    ticks = np.linspace(lo2, hi2, 5)

    dpi = 110
    fig, ax = plt.subplots(figsize=(CROSS_W / dpi, CROSS_H / dpi), dpi=dpi, constrained_layout=False)

    ax.scatter(a, p, s=14, c=COLORS["pred"], alpha=0.9, linewidths=0)
    ax.plot([lo2, hi2], [lo2, hi2], linestyle="--", linewidth=1.2, color=COLORS["ref"])

    ax.set_xlim(lo2, hi2); ax.set_ylim(lo2, hi2)
    ax.set_xticks(ticks);  ax.set_yticks(ticks)
    ax.set_aspect("equal", adjustable="box")

    fmt = FuncFormatter(lambda x, _: f"{x:,.0f}")
    ax.xaxis.set_major_formatter(fmt); ax.yaxis.set_major_formatter(fmt)

    ax.set_xlabel("Actual UCS (psi)",    fontweight="bold", fontsize=10, color="black")
    ax.set_ylabel("Predicted UCS (psi)", fontweight="bold", fontsize=10, color="black")
    ax.tick_params(labelsize=6, colors="black")

    ax.grid(True, linestyle=":", alpha=0.3)
    for spine in ax.spines.values():
        spine.set_linewidth(1.1); spine.set_color("#444")

    fig.subplots_adjust(left=0.16, bottom=0.16, right=0.98, top=0.98)
    return fig

# =========================
# Track plot (Plotly)
# =========================
def track_plot(df, include_actual=True):
    depth_col = next((c for c in df.columns if 'depth' in str(c).lower()), None)
    if depth_col is not None:
        y = pd.Series(df[depth_col]).astype(float); ylab = depth_col
        y_range = [float(y.max()), float(y.min())]  # reversed
    else:
        y = pd.Series(np.arange(1, len(df) + 1)); ylab = "Point Index"
        y_range = [float(y.max()), float(y.min())]

    x_series = pd.Series(df.get(PRED_COL, pd.Series(dtype=float))).astype(float)
    if include_actual and TARGET in df.columns:
        x_series = pd.concat([x_series, pd.Series(df[TARGET]).astype(float)], ignore_index=True)
    x_lo, x_hi = float(x_series.min()), float(x_series.max())
    x_pad = 0.03 * (x_hi - x_lo if x_hi > x_lo else 1.0)
    xmin, xmax = x_lo - x_pad, x_hi + x_pad
    tick0 = _nice_tick0(xmin, step=100)

    fig = go.Figure()
    if PRED_COL in df.columns:
        fig.add_trace(go.Scatter(
            x=df[PRED_COL], y=y, mode="lines",
            line=dict(color=COLORS["pred"], width=1.8),
            name=PRED_COL,
            hovertemplate=f"{PRED_COL}: "+"%{x:.0f}<br>"+ylab+": %{y}<extra></extra>"
        ))
    if include_actual and TARGET in df.columns:
        fig.add_trace(go.Scatter(
            x=df[TARGET], y=y, mode="lines",
            line=dict(color=COLORS["actual"], width=2.0, dash="dot"),
            name=f"{TARGET} (actual)",
            hovertemplate=f"{TARGET}: "+"%{x:.0f}<br>"+ylab+": %{y}<extra></extra>"
        ))

    fig.update_layout(
        height=TRACK_H, width=TRACK_W, autosize=False,
        paper_bgcolor="#fff", plot_bgcolor="#fff",
        margin=dict(l=64, r=16, t=36, b=48), hovermode="closest",
        font=dict(size=FONT_SZ, color="#000"),
        legend=dict(x=0.98, y=0.05, xanchor="right", yanchor="bottom",
                    bgcolor="rgba(255,255,255,0.75)", bordercolor="#ccc", borderwidth=1),
        legend_title_text=""
    )
    fig.update_xaxes(
        title_text="UCS (psi)",
        title_font=dict(size=20, family=BOLD_FONT, color="#000"),
        tickfont=dict(size=12, family=BOLD_FONT, color="#000"),
        side="top", range=[xmin, xmax],
        ticks="outside", tickformat=",.0f", tickmode="auto", tick0=tick0,
        showline=True, linewidth=1.2, linecolor="#444", mirror=True,
        showgrid=True, gridcolor="rgba(0,0,0,0.12)", automargin=True
    )
    fig.update_yaxes(
        title_text=ylab,
        title_font=dict(size=20, family=BOLD_FONT, color="#000"),
        tickfont=dict(size=15, family=BOLD_FONT, color="#000"),
        range=y_range, ticks="outside",
        showline=True, linewidth=1.2, linecolor="#444", mirror=True,
        showgrid=True, gridcolor="rgba(0,0,0,0.12)", automargin=True
    )
    return fig

# ---------- Preview (Matplotlib) ----------
def preview_tracks(df: pd.DataFrame, cols: list[str]):
    """
    Multi-track quick-look:
      - distinct color per input (stable tab20 palette)
      - shared Y & reversed (Depth down if available)
    """
    cols = [c for c in cols if c in df.columns]
    n = len(cols)
    if n == 0:
        fig, ax = plt.subplots(figsize=(4, 2))
        ax.text(0.5, 0.5, "No selected columns", ha="center", va="center"); ax.axis("off")
        return fig

    # Depth or fallback
    depth_col = next((c for c in df.columns if 'depth' in str(c).lower()), None)
    if depth_col is not None:
        idx = pd.to_numeric(df[depth_col], errors="coerce")
        y_label = depth_col
    else:
        idx = pd.Series(np.arange(1, len(df) + 1))
        y_label = "Point Index"

    cmap = plt.get_cmap("tab20")
    col_colors = {col: cmap(i % cmap.N) for i, col in enumerate(cols)}

    fig, axes = plt.subplots(1, n, figsize=(2.3 * n, 7.0), sharey=True, dpi=100)
    if n == 1: axes = [axes]

    y_min, y_max = float(idx.min()), float(idx.max())
    for i, (ax, col) in enumerate(zip(axes, cols)):
        x = pd.to_numeric(df[col], errors="coerce")
        ax.plot(x, idx, '-', lw=1.8, color=col_colors[col])
        ax.set_xlabel(col); ax.xaxis.set_label_position('top'); ax.xaxis.tick_top()
        ax.set_ylim(y_max, y_min)  # reversed
        ax.grid(True, linestyle=":", alpha=0.3)
        if i == 0:
            ax.set_ylabel(y_label)
        else:
            ax.tick_params(labelleft=False)
            ax.set_ylabel("")
    fig.tight_layout()
    return fig

# =========================
# Load model + meta
# =========================
def ensure_model() -> Path|None:
    for p in [DEFAULT_MODEL, *MODEL_FALLBACKS]:
        if p.exists() and p.stat().st_size > 0: return p
    url = os.environ.get("MODEL_URL", "")
    if not url: return None
    try:
        import requests
        DEFAULT_MODEL.parent.mkdir(parents=True, exist_ok=True)
        with requests.get(url, stream=True, timeout=30) as r:
            r.raise_for_status()
            with open(DEFAULT_MODEL, "wb") as f:
                for chunk in r.iter_content(1<<20):
                    if chunk: f.write(chunk)
        return DEFAULT_MODEL
    except Exception:
        return None

mpath = ensure_model()
if not mpath:
    st.error("Model not found. Upload models/ucs_rf.joblib (or set MODEL_URL).")
    st.stop()
try:
    model = load_model(str(mpath))
except Exception as e:
    st.error(f"Failed to load model: {e}")
    st.stop()

# Prefer UCS-specific meta
meta = {}
meta_candidates = [MODELS_DIR / "ucs_meta.json", MODELS_DIR / "meta.json"]
meta_path = next((p for p in meta_candidates if p.exists()), None)
if meta_path:
    try:
        meta = json.loads(meta_path.read_text(encoding="utf-8"))
        FEATURES = meta.get("features", FEATURES)
        TARGET   = meta.get("target", TARGET)
        PRED_COL = meta.get("pred_col", PRED_COL)
    except Exception as e:
        st.warning(f"Could not parse meta file ({meta_path.name}): {e}")

# Optional: version banner
if STRICT_VERSION_CHECK and meta.get("versions"):
    import numpy as _np, sklearn as _skl
    mv = meta["versions"]; msg=[]
    if mv.get("numpy") and mv["numpy"] != _np.__version__:
        msg.append(f"NumPy {mv['numpy']} expected, running {_np.__version__}")
    if mv.get("scikit_learn") and mv["scikit_learn"] != _skl.__version__:
        msg.append(f"scikit-learn {mv['scikit_learn']} expected, running {_skl.__version__}")
    if msg:
        st.warning("Environment mismatch: " + " | ".join(msg))

# =========================
# Session state
# =========================
st.session_state.setdefault("app_step", "intro")
st.session_state.setdefault("results", {})
st.session_state.setdefault("train_ranges", None)
st.session_state.setdefault("dev_file_name","")
st.session_state.setdefault("dev_file_bytes",b"")
st.session_state.setdefault("dev_file_loaded",False)
st.session_state.setdefault("dev_preview",False)
st.session_state.setdefault("show_preview_modal", False)

# =========================
# Sidebar branding
# =========================
st.sidebar.markdown(f"""
    <div class="centered-container">
        <img src="{inline_logo('logo.png')}" style="width: 200px; height: auto; object-fit: contain;">
        <div style='font-weight:800;font-size:1.2rem;'>{APP_NAME}</div>
        <div style='color:#667085;'>{TAGLINE}</div>
    </div>
    """, unsafe_allow_html=True
)

def sticky_header(title, message):
    st.markdown(
        f"""
        <style>
        .sticky-container {{
            position: sticky; top: 0; background-color: white; z-index: 100;
            padding-top: 10px; padding-bottom: 10px; border-bottom: 1px solid #eee;
        }}
        </style>
        <div class="sticky-container">
            <h3>{title}</h3>
            <p>{message}</p>
        </div>
        """,
        unsafe_allow_html=True
    )

# =========================
# INTRO
# =========================
if st.session_state.app_step == "intro":
    st.header("Welcome!")
    st.markdown("This software is developed by *Smart Thinking AI-Solutions Team* to estimate **UCS** from drilling data.")
    st.subheader("How It Works")
    st.markdown(
        "1) **Upload your data to build the case and preview the model performance.** \n"
        "2) Click **Run Model** to compute metrics and plots. \n"
        "3) **Proceed to Validation** (with actual UCS) or **Proceed to Prediction** (no UCS)."
    )
    if st.button("Start Showcase", type="primary"):
        st.session_state.app_step = "dev"; st.rerun()

# =========================
# CASE BUILDING
# =========================
if st.session_state.app_step == "dev":
    st.sidebar.header("Case Building")
    up = st.sidebar.file_uploader("Upload Your Data File", type=["xlsx","xls"])
    if up is not None:
        st.session_state.dev_file_bytes = up.getvalue()
        st.session_state.dev_file_name = up.name
        st.session_state.dev_file_loaded = True
        st.session_state.dev_preview = False
    if st.session_state.dev_file_loaded:
        tmp = read_book_bytes(st.session_state.dev_file_bytes)
        if tmp:
            df0 = next(iter(tmp.values()))
            st.sidebar.caption(f"**Data loaded:** {st.session_state.dev_file_name} • {df0.shape[0]} rows × {df0.shape[1]} cols")

    if st.sidebar.button("Preview data", use_container_width=True, disabled=not st.session_state.dev_file_loaded):
        st.session_state.show_preview_modal = True
        st.session_state.dev_preview = True

    run = st.sidebar.button("Run Model", type="primary", use_container_width=True)
    if st.sidebar.button("Proceed to Validation ▶", use_container_width=True): st.session_state.app_step="validate"; st.rerun()
    if st.sidebar.button("Proceed to Prediction ▶", use_container_width=True): st.session_state.app_step="predict"; st.rerun()

    if st.session_state.dev_file_loaded and st.session_state.dev_preview:
        sticky_header("Case Building", "Previewed ✓ — now click **Run Model**.")
    elif st.session_state.dev_file_loaded:
        sticky_header("Case Building", "📄 **Preview uploaded data** using the sidebar button, then click **Run Model**.")
    else:
        sticky_header("Case Building", "**Upload your data to build a case, then run the model to review development performance.**")

    if run and st.session_state.dev_file_bytes:
        book = read_book_bytes(st.session_state.dev_file_bytes)
        sh_train = find_sheet(book, ["Train","Training","training2","train","training"])
        sh_test  = find_sheet(book, ["Test","Testing","testing2","test","testing"])
        if sh_train is None or sh_test is None:
            st.markdown('<div class="st-message-box st-error">Workbook must include Train/Training/training2 and Test/Testing/testing2 sheets.</div>', unsafe_allow_html=True)
            st.stop()

        tr = _normalize_columns(book[sh_train].copy(), FEATURES, TARGET)
        te = _normalize_columns(book[sh_test].copy(),  FEATURES, TARGET)

        if not (ensure_cols(tr, FEATURES+[TARGET]) and ensure_cols(te, FEATURES+[TARGET])):
            st.markdown('<div class="st-message-box st-error">Missing required columns.</div>', unsafe_allow_html=True)
            st.stop()

        tr[PRED_COL] = model.predict(_make_X(tr, FEATURES))
        te[PRED_COL] = model.predict(_make_X(te, FEATURES))

        st.session_state.results["Train"]=tr; st.session_state.results["Test"]=te
        st.session_state.results["m_train"]={
            "R":    pearson_r(tr[TARGET], tr[PRED_COL]),
            "RMSE": rmse(tr[TARGET], tr[PRED_COL]),
            "MAPE": mape(tr[TARGET], tr[PRED_COL])
        }
        st.session_state.results["m_test"]={
            "R":    pearson_r(te[TARGET], te[PRED_COL]),
            "RMSE": rmse(te[TARGET], te[PRED_COL]),
            "MAPE": mape(te[TARGET], te[PRED_COL])
        }

        tr_min = tr[FEATURES].min().to_dict(); tr_max = tr[FEATURES].max().to_dict()
        st.session_state.train_ranges = {f:(float(tr_min[f]), float(tr_max[f])) for f in FEATURES}
        st.markdown('<div class="st-message-box st-success">Case has been built and results are displayed below.</div>', unsafe_allow_html=True)

    def _dev_block(df, m):
        c1,c2,c3 = st.columns(3)
        c1.metric("R", f"{m['R']:.3f}")
        c2.metric("RMSE", f"{m['RMSE']:.2f}")
        c3.metric("MAPE (%)", f"{m['MAPE']:.2f}%")
        st.markdown("""
            <div style='text-align: left; font-size: 0.8em; color: #6b7280; margin-top: -16px; margin-bottom: 8px;'>
                <strong>R:</strong> Pearson Correlation Coefficient<br>
                <strong>RMSE:</strong> Root Mean Square Error<br>
                <strong>MAPE:</strong> Mean Absolute Percentage Error (percent of actual; rows with near-zero actuals are ignored).
            </div>
        """, unsafe_allow_html=True)
        col_track, col_cross = st.columns([2, 3], gap="large")
        with col_track:
            st.plotly_chart(track_plot(df, include_actual=True), use_container_width=False, config={"displayModeBar": False, "scrollZoom": True})
        with col_cross:
            st.pyplot(cross_plot_static(df[TARGET], df[PRED_COL]), use_container_width=False)

    if "Train" in st.session_state.results or "Test" in st.session_state.results:
        tab1, tab2 = st.tabs(["Training", "Testing"])
        if "Train" in st.session_state.results:
            with tab1: _dev_block(st.session_state.results["Train"], st.session_state.results["m_train"])
        if "Test" in st.session_state.results:
            with tab2: _dev_block(st.session_state.results["Test"], st.session_state.results["m_test"])
        render_export_button(phase_key="dev")

# =========================
# VALIDATION (with actual UCS)
# =========================
if st.session_state.app_step == "validate":
    st.sidebar.header("Validate the Model")
    up = st.sidebar.file_uploader("Upload Validation Excel", type=["xlsx","xls"])
    if up is not None:
        book = read_book_bytes(up.getvalue())
        if book:
            df0 = next(iter(book.values()))
            st.sidebar.caption(f"**Data loaded:** {up.name} • {df0.shape[0]} rows × {df0.shape[1]} cols")
    if st.sidebar.button("Preview data", use_container_width=True, disabled=(up is None)):
        st.session_state.show_preview_modal = True
    go_btn = st.sidebar.button("Predict & Validate", type="primary", use_container_width=True)
    if st.sidebar.button("⬅ Back to Case Building", use_container_width=True): st.session_state.app_step="dev"; st.rerun()
    if st.sidebar.button("Proceed to Prediction ▶", use_container_width=True): st.session_state.app_step="predict"; st.rerun()

    sticky_header("Validate the Model", "Upload a dataset with the same **features** and **UCS** to evaluate performance.")

    if go_btn and up is not None:
        book = read_book_bytes(up.getvalue())
        name = find_sheet(book, ["Validation","Validate","validation2","Val","val"]) or list(book.keys())[0]
        df = _normalize_columns(book[name].copy(), FEATURES, TARGET)
        if not ensure_cols(df, FEATURES+[TARGET]):
            st.markdown('<div class="st-message-box st-error">Missing required columns.</div>', unsafe_allow_html=True); st.stop()
        df[PRED_COL] = model.predict(_make_X(df, FEATURES))
        st.session_state.results["Validate"]=df

        ranges = st.session_state.train_ranges; oor_pct = 0.0; tbl=None
        if ranges:
            any_viol = pd.DataFrame({f:(df[f]<ranges[f][0])|(df[f]>ranges[f][1]) for f in FEATURES}).any(axis=1)
            oor_pct = float(any_viol.mean()*100.0)
            if any_viol.any():
                tbl = df.loc[any_viol, FEATURES].copy()
                for c in FEATURES:
                    if pd.api.types.is_numeric_dtype(tbl[c]): tbl[c] = tbl[c].round(2)
                tbl["Violations"] = pd.DataFrame({f:(df[f]<ranges[f][0])|(df[f]>ranges[f][1]) for f in FEATURES}).loc[any_viol].apply(
                    lambda r:", ".join([c for c,v in r.items() if v]), axis=1
                )
        st.session_state.results["m_val"]={
            "R":    pearson_r(df[TARGET], df[PRED_COL]),
            "RMSE": rmse(df[TARGET], df[PRED_COL]),
            "MAPE": mape(df[TARGET], df[PRED_COL])
        }
        st.session_state.results["sv_val"]={"n":len(df), "pred_min":float(df[PRED_COL].min()), "pred_max":float(df[PRED_COL].max()), "oor":oor_pct}
        st.session_state.results["oor_tbl"]=tbl

    if "Validate" in st.session_state.results:
        m = st.session_state.results["m_val"]
        c1,c2,c3 = st.columns(3)
        c1.metric("R", f"{m['R']:.3f}")
        c2.metric("RMSE", f"{m['RMSE']:.2f}")
        c3.metric("MAPE (%)", f"{m['MAPE']:.2f}%")
        st.markdown("""
            <div style='text-align: left; font-size: 0.8em; color: #6b7280; margin-top: -16px; margin-bottom: 8px;'>
                <strong>R:</strong> Pearson Correlation Coefficient<br>
                <strong>RMSE:</strong> Root Mean Square Error<br>
                <strong>MAPE:</strong> Mean Absolute Percentage Error (percent of actual; rows with near-zero actuals are ignored).
            </div>
        """, unsafe_allow_html=True)

        col_track, col_cross = st.columns([2, 3], gap="large")
        with col_track:
            st.plotly_chart(track_plot(st.session_state.results["Validate"], include_actual=True),
                            use_container_width=False, config={"displayModeBar": False, "scrollZoom": True})
        with col_cross:
            st.pyplot(cross_plot_static(st.session_state.results["Validate"][TARGET],
                                        st.session_state.results["Validate"][PRED_COL]),
                      use_container_width=False)

        render_export_button(phase_key="validate")

        sv = st.session_state.results["sv_val"]
        if sv["oor"] > 0: st.markdown('<div class="st-message-box st-warning">Some inputs fall outside **training min–max** ranges.</div>', unsafe_allow_html=True)
        if st.session_state.results["oor_tbl"] is not None:
            st.write("*Out-of-range rows (vs. Training min–max):*")
            df_centered_rounded(st.session_state.results["oor_tbl"])

# =========================
# PREDICTION (no actual UCS)
# =========================
if st.session_state.app_step == "predict":
    st.sidebar.header("Prediction (No Actual UCS)")
    up = st.sidebar.file_uploader("Upload Prediction Excel", type=["xlsx","xls"])
    if up is not None:
        book = read_book_bytes(up.getvalue())
        if book:
            df0 = next(iter(book.values()))
            st.sidebar.caption(f"**Data loaded:** {up.name} • {df0.shape[0]} rows × {df0.shape[1]} cols")
    if st.sidebar.button("Preview data", use_container_width=True, disabled=(up is None)):
        st.session_state.show_preview_modal = True
    go_btn = st.sidebar.button("Predict", type="primary", use_container_width=True)
    if st.sidebar.button("⬅ Back to Case Building", use_container_width=True): st.session_state.app_step="dev"; st.rerun()

    sticky_header("Prediction", "Upload a dataset with the feature columns (no **UCS**).")

    if go_btn and up is not None:
        book = read_book_bytes(up.getvalue()); name = list(book.keys())[0]
        df = _normalize_columns(book[name].copy(), FEATURES, TARGET)
        if not ensure_cols(df, FEATURES):
            st.markdown('<div class="st-message-box st-error">Missing required columns.</div>', unsafe_allow_html=True); st.stop()
        df[PRED_COL] = model.predict(_make_X(df, FEATURES))
        st.session_state.results["PredictOnly"]=df

        ranges = st.session_state.train_ranges; oor_pct = 0.0
        if ranges:
            any_viol = pd.DataFrame({f:(df[f]<ranges[f][0])|(df[f]>ranges[f][1]) for f in FEATURES}).any(axis=1)
            oor_pct = float(any_viol.mean()*100.0)
        st.session_state.results["sv_pred"]={
            "n":len(df),
            "pred_min":float(df[PRED_COL].min()),
            "pred_max":float(df[PRED_COL].max()),
            "pred_mean":float(df[PRED_COL].mean()),
            "pred_std":float(df[PRED_COL].std(ddof=0)),
            "oor":oor_pct
        }

    if "PredictOnly" in st.session_state.results:
        df = st.session_state.results["PredictOnly"]; sv = st.session_state.results["sv_pred"]

        col_left, col_right = st.columns([2,3], gap="large")
        with col_left:
            table = pd.DataFrame({
                "Metric": ["# points","Pred min","Pred max","Pred mean","Pred std","OOR %"],
                "Value": [sv["n"], round(sv["pred_min"],2), round(sv["pred_max"],2),
                          round(sv["pred_mean"],2), round(sv["pred_std"],2), f'{sv["oor"]:.1f}%']
            })
            st.markdown('<div class="st-message-box st-success">Predictions ready ✓</div>', unsafe_allow_html=True)
            df_centered_rounded(table, hide_index=True)
            st.caption("**★ OOR** = % of rows whose input features fall outside the training min–max range.")
        with col_right:
            st.plotly_chart(track_plot(df, include_actual=False),
                            use_container_width=False, config={"displayModeBar": False, "scrollZoom": True})

        render_export_button(phase_key="predict")

# =========================
# Preview modal
# =========================
if st.session_state.show_preview_modal:
    book_to_preview = {}
    if st.session_state.app_step == "dev":
        book_to_preview = read_book_bytes(st.session_state.dev_file_bytes)
    elif st.session_state.app_step in ["validate", "predict"] and 'up' in locals() and up is not None:
        book_to_preview = read_book_bytes(up.getvalue())

    with st.expander("Preview data", expanded=True):
        if not book_to_preview:
            st.markdown('<div class="st-message-box">No data loaded yet.</div>', unsafe_allow_html=True)
        else:
            names = list(book_to_preview.keys())
            tabs = st.tabs(names)
            for t, name in zip(tabs, names):
                with t:
                    df = _normalize_columns(book_to_preview[name], FEATURES, TARGET)
                    t1, t2 = st.tabs(["Tracks", "Summary"])
                    with t1:
                        st.pyplot(preview_tracks(df, FEATURES), use_container_width=True)
                    with t2:
                        feat_present = [c for c in FEATURES if c in df.columns]
                        if not feat_present:
                            st.info("No feature columns found to summarize.")
                        else:
                            tbl = (
                                df[feat_present]
                                  .agg(['min','max','mean','std'])
                                  .T.rename(columns={"min":"Min","max":"Max","mean":"Mean","std":"Std"})
                                  .reset_index(names="Feature")
                            )
                            df_centered_rounded(tbl)

    st.session_state.show_preview_modal = False

# =========================
# Footer
# =========================
st.markdown("""
<br><br><br>
<hr>
<div style='text-align:center;color:#6b7280;font-size:1.0em;'>
    © 2025 Smart Thinking AI-Solutions Team. All rights reserved.<br>
    Website: <a href="https://smartthinking.com.sa" target="_blank" rel="noopener noreferrer">smartthinking.com.sa</a>
</div>
""", unsafe_allow_html=True)