import spacy
spacy.prefer_gpu()
from spacy.cli.download import download
from spacy.matcher import Matcher
import numpy as np
import gradio as gr
import pandas as pd
from typing import List, Type
from datetime import datetime
from search_funcs.helper_functions import create_highlighted_excel_wb

PandasDataFrame = Type[pd.DataFrame]

today_rev = datetime.now().strftime("%Y%m%d")

# Load the SpaCy model

#os.system("python -m spacy download en_core_web_sm")
try:
	import en_core_web_sm
	nlp = en_core_web_sm.load()
	print("Successfully imported spaCy model")
    #nlp = spacy.load("en_core_web_sm")
    #print(nlp._path)
except:
	download("en_core_web_sm")
	nlp = spacy.load("en_core_web_sm")
	print("Successfully imported spaCy model")

def spacy_fuzzy_search(string_query:str, df_list: List[str], original_data: PandasDataFrame, text_column:str, in_join_file: PandasDataFrame, search_df_join_column:str, in_join_column:str, no_spelling_mistakes:int = 1, progress=gr.Progress(track_tqdm=True)):
    ''' Conduct fuzzy match on a list of data.'''

    if len(df_list) > 10000:
         out_message = "Your data has more than 10,000 rows and will take more than three minutes to do a fuzzy search. Please try keyword or semantic search for data of this size." 
         return out_message, None

    query = nlp(string_query)
    tokenised_query = [token.text for token in query]
    print(tokenised_query)

    spelling_mistakes_fuzzy_pattern = "FUZZY" + str(no_spelling_mistakes)

    # %%
    if len(tokenised_query) > 1:
        pattern_lemma = [{"LEMMA": {"IN": tokenised_query}}]
        pattern_fuzz = [{"TEXT": {spelling_mistakes_fuzzy_pattern: {"IN": tokenised_query}}}]
    else:
        pattern_lemma = [{"LEMMA": tokenised_query[0]}]
        pattern_fuzz = [{"TEXT": {spelling_mistakes_fuzzy_pattern: tokenised_query[0]}}]

   
    # %%
    matcher = Matcher(nlp.vocab)
    
    # %%
    matcher.add(string_query, [pattern_fuzz])
    matcher.add(string_query, [pattern_lemma])

    # %%
    batch_size = 256
    docs = nlp.pipe(df_list, batch_size=batch_size)

    # %%
    all_matches = []   

    # Get number of matches per doc
    for doc in progress.tqdm(docs, desc = "Searching text", unit = "rows"):
        matches = matcher(doc)
        match_count = len(matches)
        all_matches.append(match_count)

    print("Search complete")

    ## Get document lengths
    lengths = []
    for element in df_list:
        lengths.append(len(element))
        
    # Score is number of matches divided by length of document
    match_scores = (np.array(all_matches)/np.array(lengths)).tolist()

    # Prepare results and export
    results_df = pd.DataFrame(data={"index": list(range(len(df_list))),
                                    "search_text": df_list,
                                    "search_score_abs": match_scores})
    results_df['search_score_abs'] = abs(round(results_df['search_score_abs']*100, 2))
    results_df_out = results_df[['index', 'search_text', 'search_score_abs']].merge(original_data,left_on="index", right_index=True, how="left")

    # Keep only results with at least one match
    results_df_out = results_df_out.loc[results_df["search_score_abs"] > 0, :]

    # Join on additional files
    if not in_join_file.empty:
        progress(0.5, desc = "Joining on additional data file")
        join_df = in_join_file
        join_df[in_join_column] = join_df[in_join_column].astype(str).str.replace("\.0$","", regex=True)
        results_df_out[search_df_join_column] = results_df_out[search_df_join_column].astype(str).str.replace("\.0$","", regex=True)

        # Duplicates dropped so as not to expand out dataframe
        join_df = join_df.drop_duplicates(in_join_column)

        results_df_out = results_df_out.merge(join_df,left_on=search_df_join_column, right_on=in_join_column, how="left", suffixes=('','_y'))#.drop(in_join_column, axis=1)

    # Reorder results by score
    results_df_out = results_df_out.sort_values('search_score_abs', ascending=False)

    # Out file
    query_str_file = ("_").join(tokenised_query)
    results_df_name = "keyword_search_result_" + today_rev + "_" +  query_str_file + ".xlsx"

    print("Saving search file output")
    progress(0.7, desc = "Saving search output to file")

    #results_df_out.to_excel(results_df_name, index= None)

    # Highlight found text and save to file
    results_df_out_wb = create_highlighted_excel_wb(results_df_out, free_text_query, "search_text")
    results_df_out_wb.save(results_df_name)
    
    results_first_text = results_df_out[text_column].iloc[0]

    print("Returning results")

    return results_first_text, results_df_name