import json
import os
import importlib
import re
import random
import tqdm
import pandas as pd
import traceback

def import_lib(path, file_name, package_name):
    file_path = path + "/" + file_name + ".py"
    spec = importlib.util.spec_from_file_location(file_name, file_path)
    imported_file = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(imported_file)
    return getattr(imported_file, package_name)


Configuration = import_lib(os.path.dirname(__file__) , "configuration", "Configuration")
QueryGenerator = import_lib(os.path.dirname(__file__) , "query_generator", "QueryGenerator")
ParallelRequester = import_lib(os.path.dirname(__file__) , "parallel_requester", "ParallelRequester")

class Pipline:
    def __init__(self):
        self.file_path = os.path.dirname(__file__)
        self.configuration = Configuration()
        self.configuration.init_persona()
        self.query_generator = QueryGenerator()


    def load_data(self):
        df = pd.read_csv(self.file_path + "/../data/persian_blog/blogs.csv")
        rows = df.values.tolist()
        rows = [rows[i][0] for i in range(len(rows))]
        return rows
    

    def get_new_path(self):
        path = self.file_path + "/../data/generated"
        if not os.path.exists(path):
            os.makedirs(path)
        
        folders = [f for f in os.listdir(path) if os.path.isdir(os.path.join(path, f))]

        pattern = r"^v(\d+)$"

        all_numbers = []

        for f in folders:
            match = re.match(pattern, f)
            if match:
                num = int(match.group(1))
                all_numbers.append(num)

        if all_numbers:
            number = max(all_numbers) + 1
        else:
            number = 1
        
        path  = os.path.join(path, "v" + str(number))
        if not os.path.exists(path):
            os.makedirs(path)
        return path

    def get_json_path(self, save_path):
        files = [f for f in os.listdir(save_path) if os.path.isfile(os.path.join(save_path, f))]

        pattern = r"^part_(\d+)_dataset\.json$"

        all_numbers = []

        for f in files:
            match = re.match(pattern, f)
            if match:
                num = int(match.group(1))
                all_numbers.append(num)

        if all_numbers:
            number = max(all_numbers) + 1
        else:
            number = 1
        
        json_path  = os.path.join(save_path, "part_" + str(number) + "_dataset.json")
        return json_path


    def save_dataset(self, data, save_path):
        

        json_path = self.get_json_path(save_path)

        with open(json_path, "w", encoding="utf-8") as f:
            json.dump(data, f, ensure_ascii=False, indent=2)
    

    def get_a_data(self):
        with self.lock:
            if self.data_idx < len(self.data):
                data = self.data[self.data_idx]
                data_idx = self.data_idx
            else:
                data = None
                data_idx = None
            self.data_idx += 1
        return data, data_idx
    

    def exec_function(self, passage):
        try:
            config = self.configuration.run(passage)
            generated_data = self.query_generator.run(passage, config)
            one_data = config.copy()
            one_data["document"] = passage
            one_data["query"] = generated_data["query"]
        except Exception as e:
            one_data = {"passage": passage, "error": traceback.format_exc()}
        return one_data
    

    def make_a_passage(self, selected_lenth, sentences, start_idx):
        one_passage = ""
        for i in range(start_idx, len(sentences)):
            if len(one_passage) + len(sentences[i]) > selected_lenth and len(one_passage) > 0:
                return one_passage, i
            if one_passage == "":
                one_passage += sentences[i]
            else:
                one_passage += "." + sentences[i]
        return one_passage, len(sentences)
    

    def chunk_data(self, passage):
        max_length = 3000
        min_length = 30

        if len(passage) < max_length:
            return [passage]
        
        sentences = passage.split(".")

        all_passages = []
        start_idx = 0
        stop_idx = 0
        while True:
            selected_lenth = random.choice([50, 100, 200, 300, 500, 800, 1300, 2000, 3000])
            start_idx = stop_idx
            one_passage, stop_idx = self.make_a_passage(selected_lenth, sentences, start_idx)

            if len(one_passage) > min_length:
                all_passages += [one_passage]
            
            if stop_idx == len(sentences):
                break
        
        return all_passages
        

    
    def pre_process(self, data):
        chunk_data = []
        for i in tqdm.trange(len(data)):
            chunk_data += self.chunk_data(data[i])
        random.shuffle(chunk_data)
        return chunk_data


    def run_one_part(self, chunk_data, save_path, num_threads):
        parallel_requester = ParallelRequester()
        dataset = parallel_requester.run(chunk_data, self.exec_function, num_threads)

        self.save_dataset(dataset, save_path)
    

    def run(self, save_path = None):
        data = self.load_data()
        chunk_data = self.pre_process(data)

        num_data = 250000
        num_part_data = 25000
        num_threads = 5

        if save_path == None:
            save_path = self.get_new_path()
        
        for i in range(0, num_data, num_part_data):
            start_idx = i
            stop_idx = min(i+num_part_data, num_data)
            self.run_one_part(chunk_data[start_idx:stop_idx], save_path, num_threads)


def main():
    random.seed(42)
    pipline = Pipline()
    pipline.run()


if __name__ == "__main__":
    main()