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from nsepython import *
import pandas as pd
def build_preopen_html(key="NIFTY"):
# Fetch pre-open data
p = nsefetch("https://www.nseindia.com/api/market-data-pre-open?key=" + key)
data_df = df_from_data(p.pop("data"))
rem_df = df_from_data([p])
main_df = data_df.iloc[[0]] if not data_df.empty else pd.DataFrame()
const_df = data_df.iloc[1:] if len(data_df) > 1 else pd.DataFrame()
# ================= HELPER FUNCTION =================
def df_to_html_color(df, metric_col=None):
df_html = df.copy()
top3_up = []
top3_down = []
if metric_col and metric_col in df_html.columns and pd.api.types.is_numeric_dtype(df_html[metric_col]):
col_numeric = df_html[metric_col].dropna()
top3_up = col_numeric.nlargest(3).index.tolist()
top3_down = col_numeric.nsmallest(3).index.tolist()
for idx, row in df_html.iterrows():
for col in df_html.columns:
val = row[col]
style = ""
if pd.api.types.is_numeric_dtype(type(val)) or isinstance(val, (int, float)):
val_fmt = f"{val:.2f}"
if val > 0:
style = "numeric-positive"
elif val < 0:
style = "numeric-negative"
if metric_col and col == metric_col:
if idx in top3_up:
style += " top-up"
elif idx in top3_down:
style += " top-down"
df_html.at[idx, col] = f'<span class="{style.strip()}">{val_fmt}</span>'
else:
df_html.at[idx, col] = str(val)
return df_html.to_html(index=False, escape=False, classes="compact-table")
# ================= MERGE INFO + MAIN INTO MINI-CARDS =================
def merge_info_main_cards(rem_df, main_df):
combined = pd.concat([rem_df, main_df], axis=1)
combined = combined.loc[:, ~combined.columns.duplicated()]
cards_html = '<div class="mini-card-container">'
for col in combined.columns:
val = combined.at[0, col] if not combined.empty else ""
cards_html += f'''
<div class="mini-card">
<div class="card-key">{col}</div>
<div class="card-val">{val}</div>
</div>
'''
cards_html += '</div>'
return cards_html
info_cards_html = merge_info_main_cards(rem_df, main_df)
# Constituents table
cons_html = df_to_html_color(const_df) if not const_df.empty else "<i>No pre-open constituents</i>"
# Metric tables (for numeric columns)
metric_cols = [c for c in const_df.columns if pd.api.types.is_numeric_dtype(const_df[c])] if not const_df.empty else []
metric_tables = ""
for col in metric_cols:
df_const = const_df.copy()
df_const[col] = pd.to_numeric(df_const[col], errors="ignore")
df_const = df_const.sort_values(col, ascending=False)
df_html = df_to_html_color(df_const[['symbol', col]] if 'symbol' in df_const.columns else df_const[[col]], metric_col=col)
metric_tables += f"""
<div class="small-table">
<div class="st-title">{col}</div>
<div class="st-body">{df_html}</div>
</div>
"""
# ================= FINAL HTML =================
html = f"""
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
body {{
font-family: Arial;
margin: 12px;
background: #f5f5f5;
color: #222;
font-size: 14px;
}}
h2, h3 {{
margin: 12px 0 6px 0;
font-weight: 600;
}}
table {{
border-collapse: collapse;
width: 100%;
table-layout: auto;
}}
th, td {{
border: 1px solid #bbb;
padding: 5px 8px;
text-align: left;
font-size: 13px;
}}
th {{
background: #333;
color: white;
font-weight: 600;
}}
.compact-table td.numeric-positive {{ color: green; font-weight: bold; }}
.compact-table td.numeric-negative {{ color: red; font-weight: bold; }}
.compact-table td.top-up {{ background: #a8f0a5; }}
.compact-table td.top-down {{ background: #f0a8a8; }}
.small-table {{
background: white;
border-radius: 6px;
padding: 8px;
box-shadow: 0px 1px 4px rgba(0,0,0,0.15);
border: 1px solid #ddd;
overflow-y: auto;
}}
.st-title {{
font-size: 14px;
text-align: center;
margin-bottom: 6px;
font-weight: bold;
background: #222;
color: white;
padding: 5px 0;
border-radius: 4px;
}}
.st-body {{
max-height: 300px;
overflow-y: auto;
font-size: 12px;
}}
.grid {{
display: grid;
grid-template-columns: repeat(5, 1fr);
gap: 12px;
margin-top: 12px;
}}
.mini-card-container {{
display: flex;
flex-wrap: wrap;
gap: 10px;
}}
.mini-card {{
background: #fff;
padding: 8px 10px;
border-radius: 6px;
box-shadow: 0 1px 3px rgba(0,0,0,0.12);
min-width: 120px;
font-size: 13px;
}}
.card-key {{ font-weight: bold; color: #333; margin-bottom: 2px; }}
.card-val {{ color: #222; }}
</style>
</head>
<body>
<h2>Pre-Open Data: {key}</h2>
<div class="compact-section">
<h3>Info + Main Data</h3>
{info_cards_html}
</div>
<div class="compact-section">
<h3>Pre-Open Constituents</h3>
{cons_html}
</div>
<h3>Metric Tables (if numeric)</h3>
<div class="grid">
{metric_tables}
</div>
</body>
</html>
"""
return html
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