app.py

import pandas as pd
import streamlit as st
import matplotlib.pyplot as plt
import matplotlib.font_manager as font_manager
import io
import base64
import os
from datetime import datetime, timedelta
import math
from matplotlib.patches import FancyBboxPatch
from pypinyin import lazy_pinyin, Style
from matplotlib.backends.backend_pdf import PdfPages

def get_font(size=14):
    """Loads a specific font file, falling back to a common name if not found."""
    font_path = "simHei.ttc"
    if not os.path.exists(font_path):
        font_path = "SimHei.ttf"
    return font_manager.FontProperties(fname=font_path, size=size)

def get_pinyin_abbr(text):
    """Gets the first letter of the Pinyin for the first two Chinese characters of a text."""
    if not text:
        return ""
    # Extract the first two Chinese characters
    chars = [c for c in text if '\u4e00' <= c <= '\u9fff']
    chars = chars[:2]
    # Get the first letter of the pinyin for each character
    pinyin_list = lazy_pinyin(chars, style=Style.FIRST_LETTER)
    return ''.join(pinyin_list).upper()

def process_schedule(file):
    """Processes the uploaded Excel file to extract and clean the movie schedule."""
    try:
        # Attempt to read the date from a specific cell
        date_df = pd.read_excel(file, header=None, skiprows=7, nrows=1, usecols=[3])
        date_str = pd.to_datetime(date_df.iloc[0, 0]).strftime('%Y-%m-%d')
        base_date = pd.to_datetime(date_str).date()
    except Exception:
        # Fallback to the current date if reading fails
        date_str = datetime.today().strftime('%Y-%m-%d')
        base_date = datetime.today().date()
    
    try:
        # Read the main schedule data
        df = pd.read_excel(file, header=9, usecols=[1, 2, 4, 5])
        df.columns = ['Hall', 'StartTime', 'EndTime', 'Movie']
        
        # Clean and format the data
        df['Hall'] = df['Hall'].ffill()
        df.dropna(subset=['StartTime', 'EndTime', 'Movie'], inplace=True)
        df['Hall'] = df['Hall'].astype(str).str.extract(r'(\d+号)')
        
        # Convert time strings to datetime objects
        df['StartTime_dt'] = pd.to_datetime(df['StartTime'], format='%H:%M', errors='coerce').apply(
            lambda t: t.replace(year=base_date.year, month=base_date.month, day=base_date.day) if pd.notnull(t) else t
        )
        df['EndTime_dt'] = pd.to_datetime(df['EndTime'], format='%H:%M', errors='coerce').apply(
            lambda t: t.replace(year=base_date.year, month=base_date.month, day=base_date.day) if pd.notnull(t) else t
        )
        
        # Handle overnight screenings
        df.loc[df['EndTime_dt'] < df['StartTime_dt'], 'EndTime_dt'] += timedelta(days=1)
        df = df.sort_values(['Hall', 'StartTime_dt'])
        
        # Merge consecutive screenings of the same movie
        merged_rows = []
        for hall, group in df.groupby('Hall'):
            group = group.sort_values('StartTime_dt')
            current = None
            for _, row in group.iterrows():
                if current is None:
                    current = row.copy()
                else:
                    if row['Movie'] == current['Movie']:
                        current['EndTime_dt'] = row['EndTime_dt'] # Extend the end time
                    else:
                        merged_rows.append(current)
                        current = row.copy()
            if current is not None:
                merged_rows.append(current)
        
        merged_df = pd.DataFrame(merged_rows)
        
        # Adjust times as per requirement
        merged_df['StartTime_dt'] = merged_df['StartTime_dt'] - timedelta(minutes=10)
        merged_df['EndTime_dt'] = merged_df['EndTime_dt'] - timedelta(minutes=5)
        
        # Format times back to strings for display
        merged_df['StartTime_str'] = merged_df['StartTime_dt'].dt.strftime('%H:%M')
        merged_df['EndTime_str'] = merged_df['EndTime_dt'].dt.strftime('%H:%M')
        
        return merged_df[['Hall', 'Movie', 'StartTime_str', 'EndTime_str']], date_str
    except Exception:
        # Return None if any processing error occurs
        return None, date_str

def create_print_layout(data, date_str):
    """Creates PNG and PDF layouts of the schedule, maximizing content size."""
    if data is None or data.empty:
        return None

    # --- Figure Setup ---
    # A4 paper size in inches, 300 dpi for good quality
    fig_width, fig_height = 8.27, 11.69
    dpi = 300

    # Create separate figures for PNG and PDF
    png_fig = plt.figure(figsize=(fig_width, fig_height), dpi=dpi)
    png_ax = png_fig.add_subplot(111)
    png_ax.set_axis_off()
    
    pdf_fig = plt.figure(figsize=(fig_width, fig_height), dpi=dpi)
    pdf_ax = pdf_fig.add_subplot(111)
    pdf_ax.set_axis_off()

    # Set tight margins to maximize the content area on the page.
    margin = 0.03
    png_fig.subplots_adjust(left=margin, right=1-margin, top=1-margin, bottom=margin)
    pdf_fig.subplots_adjust(left=margin, right=1-margin, top=1-margin, bottom=margin)

    # --- Drawing Logic ---
    def process_figure(fig, ax):
        # --- Dynamic Sizing ---
        halls = sorted(data['Hall'].unique(), key=lambda h: int(h.replace('号','')) if h else 0)
        
        # Calculate total lines needed: one for each movie + a gap between each hall's schedule
        num_movie_lines = len(data)
        num_hall_breaks = len(halls) - 1
        total_lines = num_movie_lines + num_hall_breaks
        if total_lines == 0: return

        # Calculate the height available for content based on margins
        available_height = 1 - (2 * margin)
        # Calculate the height for each line to perfectly fill the page
        line_height = available_height / total_lines
        
        # Dynamically set font size based on line height.
        # This makes the text as large as possible while still fitting.
        # (72 points per inch, 0.65 is a factor for vertical padding)
        font_size_pt = line_height * fig_height * 72 * 0.65
        hall_font = get_font(font_size_pt)
        movie_font = get_font(font_size_pt)
        date_font = get_font(font_size_pt * 0.7)

        # --- Content Drawing ---
        ax.text(0.01, 0.99, date_str, 
                fontsize=date_font.get_size(), color='#A9A9A9',
                ha='left', va='top', fontproperties=date_font,
                transform=ax.transAxes, zorder=2)
        
        y_position = 0.99 # Start drawing from the top
        
        for hall in halls:
            hall_data = data[data['Hall'] == hall].sort_values('StartTime_str')
            y_block_top = y_position
            hall_num_str = hall.replace("号", "")
            hall_display_text = f"${hall_num_str}^{{\\#}}$"
            
            # Center text vertically within its line height for better appearance
            text_v_align_offset = line_height * 0.5
            
            for i, (_, row) in enumerate(hall_data.iterrows()):
                if i == 0:
                    ax.text(0.05, y_position - text_v_align_offset, hall_display_text,
                            fontproperties=hall_font, fontweight='bold',
                            ha='center', va='center', transform=ax.transAxes, zorder=2)
                
                pinyin_abbr = get_pinyin_abbr(row['Movie'])
                movie_display_text = f"{i+1}. {pinyin_abbr} {row['Movie']}"
                ax.text(0.15, y_position - text_v_align_offset, movie_display_text,
                        fontproperties=movie_font, ha='left', va='center',
                        transform=ax.transAxes, zorder=2, clip_on=True)
                
                time_display_text = f"{row['StartTime_str']} - {row['EndTime_str']}"
                ax.text(0.99, y_position - text_v_align_offset, time_display_text,
                        fontproperties=movie_font, ha='right', va='center',
                        transform=ax.transAxes, zorder=2)
                
                y_position -= line_height

            # Add a decorative rounded box around each hall's schedule
            y_block_bottom = y_position + line_height
            rect_height = y_block_top - y_block_bottom
            
            rect = FancyBboxPatch((0, y_block_bottom), 1, rect_height,
                                  boxstyle="round,pad=0.01,rounding_size=0.02",
                                  edgecolor='gray', facecolor='white',
                                  linewidth=0.8, zorder=1, transform=ax.transAxes)
            ax.add_patch(rect)
            
            if hall != halls[-1]:
                y_position -= line_height # Add gap for the next block

    # Render the layout on both figures
    process_figure(png_fig, png_ax)
    process_figure(pdf_fig, pdf_ax)
    
    # --- File Saving ---
    # Save PNG to a memory buffer
    png_buffer = io.BytesIO()
    png_fig.savefig(png_buffer, format='png', bbox_inches='tight', pad_inches=0.05)
    png_buffer.seek(0)
    image_base64 = base64.b64encode(png_buffer.getvalue()).decode()
    plt.close(png_fig)
    
    # Save PDF to a memory buffer
    pdf_buffer = io.BytesIO()
    with PdfPages(pdf_buffer) as pdf:
        pdf.savefig(pdf_fig, bbox_inches='tight', pad_inches=0.05)
    pdf_buffer.seek(0)
    pdf_base64 = base64.b64encode(pdf_buffer.getvalue()).decode()
    plt.close(pdf_fig)
    
    return {
        'png': f"data:image/png;base64,{image_base64}",
        'pdf': f"data:application/pdf;base64,{pdf_base64}"
    }

def display_pdf(base64_pdf):
    """Generates the HTML to embed and display a PDF in Streamlit."""
    pdf_display = f"""
    <iframe src="{base64_pdf}" width="100%" height="800" type="application/pdf"></iframe>
    """
    return pdf_display

# --- Streamlit App ---
st.set_page_config(page_title="LED 屏幕时间表打印", layout="wide")
st.title("LED 屏幕时间表打印")

uploaded_file = st.file_uploader("选择打开【放映时间核对表.xls】文件", accept_multiple_files=False, type=["xls"])

if uploaded_file:
    with st.spinner("文件正在处理中，请稍候..."):
        schedule, date_str = process_schedule(uploaded_file)
        if schedule is not None:
            output = create_print_layout(schedule, date_str)
            
            # Use tabs for PDF and PNG previews
            tab1, tab2 = st.tabs(["PDF 预览", "PNG 预览"])
            
            with tab1:
                st.markdown(display_pdf(output['pdf']), unsafe_allow_html=True)
            
            with tab2:
                st.image(output['png'], use_container_width=True)
        else:
            st.error("无法处理文件，请检查文件格式或内容是否正确。")