import streamlit as st
import re
import os
import glob

st.set_page_config(layout="wide")

def process_line(line):
    if re.search(r'\b[A-G][#b]?m?\b', line):
        line = re.sub(r'\b([A-G][#b]?m?)\b', r"<img src='\1.png' style='height:20px;'>", line)
    return line

def process_chord_sheet(chord_sheet):
    processed_lines = []
    for line in chord_sheet.split('\n'):
        processed_line = process_line(line)
        processed_lines.append(processed_line)
    return '<br>'.join(processed_lines)

def create_search_url_wikipedia(artist_song):
    base_url = "https://www.wikipedia.org/search-redirect.php?family=wikipedia&language=en&search="
    return base_url + artist_song.replace(' ', '+').replace('–', '%E2%80%93').replace('&', 'and')

def create_search_url_youtube(artist_song):
    base_url = "https://www.youtube.com/results?search_query="
    return base_url + artist_song.replace(' ', '+').replace('–', '%E2%80%93').replace('&', 'and')

def create_search_url_chords(artist_song):
    base_url = "https://www.ultimate-guitar.com/search.php?search_type=title&value="
    return base_url + artist_song.replace(' ', '+').replace('–', '%E2%80%93').replace('&', 'and')

def create_search_url_lyrics(artist_song):
    base_url = "https://www.google.com/search?q="
    return base_url + artist_song.replace(' ', '+').replace('–', '%E2%80%93').replace('&', 'and') + '+lyrics'

def songupdate():
    st.write(st.session_state.EnhancedChordSheet)

def load_song_file(filename):
    with open(filename, "r") as file:
        chord_sheet = file.read()
        st.text_area(label="Enhanced Chord Sheet", value=chord_sheet, height=300, key="EnhancedChordSheet", help="This text can be read due to alternating chord lines and lyric lines.", label_visibility="visible", on_change=songupdate )
        processed_sheet = process_chord_sheet(chord_sheet)
        st.markdown(processed_sheet, unsafe_allow_html=True)

# Automatic save function
def auto_save():
    song_name = st.session_state['song_name']
    artist_name = st.session_state['artist_name']
    chord_sheet = st.session_state['chord_sheet']

    # Display the character count
    st.sidebar.write("Character Count:", len(chord_sheet))

    if song_name and artist_name:
        filename = f"{song_name} by {artist_name}.txt".replace(" ", "_")
        with open(filename, "w") as file:
            file.write(chord_sheet)
        st.sidebar.success("Chord sheet auto-saved.")

def main():
    st.title('🎵 Song Files')
    with st.expander("Select Song File", expanded=True):
        all_files = [f for f in glob.glob("*.txt") if ' by ' in f]
        selected_file = st.selectbox("Choose a file", all_files)
        if selected_file:
            song_name, artist_name = os.path.splitext(selected_file)[0].split(' by ')
            song_name = song_name.replace("_", " ")
            artist_name = artist_name.replace("_", " ")
        else:
            song_name, artist_name = "", ""
    col1, col2 = st.columns([4, 1])
    with col1:
        song_name_input = st.text_input("🎵 Song Name", key='song_name')
        artist_name_input = st.text_input("🎤 Artist Name", key='artist_name')

        # Load chord sheet from selected file into the text area
        if selected_file:
            with open(selected_file, "r") as file:
                chord_sheet_input = file.read()
                st.session_state['chord_sheet'] = chord_sheet_input
            chord_sheet_area = st.text_area("Chord Sheet", value=chord_sheet_input, height=300, key='chord_sheet', on_change=auto_save)
        else:
            chord_sheet_area = st.text_area("Chord Sheet", height=300, key='chord_sheet', on_change=auto_save)

        # Save functionality
        if st.button("💾 Save", key="save_song"):
            if song_name_input and artist_name_input:
                filename = f"{song_name_input} by {artist_name_input}.txt".replace(" ", "_")
                with open(filename, "w") as file:
                    file.write(chord_sheet_area)
                st.success("Chord sheet saved.")
            else:
                st.error("Both Song Name and Artist Name are required.")

        st.header("🎼 Available Songs")
        for file in all_files:
            song_info = os.path.splitext(file)[0].replace("_", " ")
            icol1, icol2 = st.columns([4, 1])
            with icol1:
                st.markdown(f"* {song_info}")
            with icol2:
                st.markdown(f"[📚Wikipedia]({create_search_url_wikipedia(song_info)})")
                st.markdown(f"[🎥YouTube]({create_search_url_youtube(song_info)})")
                st.markdown(f"[🎸Chords]({create_search_url_chords(song_info)})")
                st.markdown(f"[🎶Lyrics]({create_search_url_lyrics(song_info)})")

        if selected_file:
            load_song_file(selected_file)
            song_info = os.path.splitext(selected_file)[0].replace("_", " ")

    with col2:
        if selected_file:
            st.markdown(f"**Selected Song:** {song_info}")
            st.markdown(f"[📚Wikipedia]({create_search_url_wikipedia(song_info)})")
            st.markdown(f"[🎥YouTube]({create_search_url_youtube(song_info)})")
            st.markdown(f"[🎸Chords]({create_search_url_chords(song_info)})")
            st.markdown(f"[🎶Lyrics]({create_search_url_lyrics(song_info)})")

        
if __name__ == '__main__':
    main()