from transformers import AutoModelForSeq2SeqLM, AutoTokenizer
import torch
from modules.file import ExcelFileWriter
import os

from abc import ABC, abstractmethod
from typing import List
import re

class FilterPipeline():
    def __init__(self, filter_list):
        self._filter_list:List[Filter] = filter_list

    def append(self, filter):
        self._filter_list.append(filter)

    def batch_encoder(self, inputs):
        for filter in self._filter_list:
            inputs = filter.encoder(inputs)
        return inputs
    
    def batch_decoder(self, inputs):
        for filter in reversed(self._filter_list):
            inputs = filter.decoder(inputs)
        return inputs

class Filter(ABC):
    def __init__(self):
        self.name = 'filter'
        self.code = []
    @abstractmethod
    def encoder(self, inputs):
        pass

    @abstractmethod
    def decoder(self, inputs):
        pass

class SpecialTokenFilter(Filter):
    def __init__(self):
        self.name = 'special token filter'
        self.code = []
        self.special_tokens = ['!', '！', '-']
    
    def encoder(self, inputs):
        filtered_inputs = []
        self.code = []
        for i, input_str in enumerate(inputs):
            if not all(char in self.special_tokens for char in input_str):
                filtered_inputs.append(input_str)
            else:
                self.code.append([i, input_str])
        return filtered_inputs
    
    def decoder(self, inputs):
        original_inputs = inputs.copy()
        for removed_indice in self.code:
            original_inputs.insert(removed_indice[0], removed_indice[1])
        return original_inputs

class SperSignFilter(Filter):
    def __init__(self):
        self.name = 's percentage sign filter'
        self.code = []
    
    def encoder(self, inputs):
        encoded_inputs = []
        self.code = []  # 清空 self.code
        for i, input_str in enumerate(inputs):
            if '%s' in input_str:
                encoded_str = input_str.replace('%s', '*')
                self.code.append(i)  # 将包含 '%s' 的字符串的索引存储到 self.code 中
            else:
                encoded_str = input_str
            encoded_inputs.append(encoded_str)
        return encoded_inputs
    
    def decoder(self, inputs):
        decoded_inputs = inputs.copy()
        for i in self.code:
            decoded_inputs[i] = decoded_inputs[i].replace('*', '%s')  # 使用 self.code 中的索引还原原始字符串
        return decoded_inputs

class ParenSParenFilter(Filter):
    def __init__(self):
        self.name = 'Paren s paren filter'
        self.code = []
    
    def encoder(self, inputs):
        encoded_inputs = []
        self.code = []  # 清空 self.code
        for i, input_str in enumerate(inputs):
            if '(s)' in input_str:
                encoded_str = input_str.replace('(s)', '$')
                self.code.append(i)  # 将包含 '(s)' 的字符串的索引存储到 self.code 中
            else:
                encoded_str = input_str
            encoded_inputs.append(encoded_str)
        return encoded_inputs
    
    def decoder(self, inputs):
        decoded_inputs = inputs.copy()
        for i in self.code:
            decoded_inputs[i] = decoded_inputs[i].replace('$', '(s)')  # 使用 self.code 中的索引还原原始字符串
        return decoded_inputs
    
class ChevronsFilter(Filter):
    def __init__(self):
        self.name = 'chevrons filter'
        self.code = []

    def encoder(self, inputs):
        encoded_inputs = []
        self.code = []  # 清空 self.code
        pattern = re.compile(r'<.*?>')
        for i, input_str in enumerate(inputs):
            if pattern.search(input_str):
                matches = pattern.findall(input_str)
                encoded_str = pattern.sub('#', input_str)
                self.code.append((i, matches))  # 将包含匹配模式的字符串的索引和匹配列表存储到 self.code 中
            else:
                encoded_str = input_str
            encoded_inputs.append(encoded_str)
        return encoded_inputs

    def decoder(self, inputs):
        decoded_inputs = inputs.copy()
        for i, matches in self.code:
            for match in matches:
                decoded_inputs[i] = decoded_inputs[i].replace('#', match, 1)  # 使用 self.code 中的匹配列表依次还原原始字符串
        return decoded_inputs
    
class SimilarFilter(Filter):
    def __init__(self):
        self.name = 'similar filter'
        self.code = []
    
    def is_similar(self, str1, str2):
        # 判断两个字符串是否相似（只有数字上有区别）
        pattern = re.compile(r'\d+')
        return pattern.sub('', str1) == pattern.sub('', str2)
    
    def encoder(self, inputs):
        encoded_inputs = []
        self.code = []  # 清空 self.code
        i = 0
        while i < len(inputs):
            encoded_inputs.append(inputs[i])
            similar_strs = [inputs[i]]
            j = i + 1
            while j < len(inputs) and self.is_similar(inputs[i], inputs[j]):
                similar_strs.append(inputs[j])
                j += 1
            if len(similar_strs) > 1:
                self.code.append((i, similar_strs))  # 将相似字符串的起始索引和实际字符串列表存储到 self.code 中
            i = j
        return encoded_inputs
    
    def decoder(self, inputs:List):
        decoded_inputs = inputs
        for i, similar_strs in self.code:
            pattern = re.compile(r'\d+')
            for j in range(len(similar_strs)):
                if pattern.search(similar_strs[j]):
                    number = re.findall(r'\d+', similar_strs[j])[0]  # 获取相似字符串的数字部分
                    new_str = pattern.sub(number, inputs[i])  # 将新字符串的数字部分替换为相似字符串的数字部分
                else:
                    new_str = inputs[i]  # 如果相似字符串不含数字，直接使用新字符串
                if j > 0:
                    decoded_inputs.insert(i+j, new_str)
        return decoded_inputs

class ChineseFilter:
    def __init__(self, pinyin_lib_file='pinyin.txt'):
        self.name = 'chinese filter'
        self.code = []
        self.pinyin_lib = self.load_pinyin_lib(pinyin_lib_file)

    def load_pinyin_lib(self, file_path):
        with open(os.path.join(script_dir,file_path), 'r', encoding='utf-8') as f:
            return set(line.strip().lower() for line in f)

    def is_valid_chinese(self, word):
        # 判断一个单词是否符合要求:只有一个单词构成,并且首字母大写
        if len(word.split()) == 1 and word[0].isupper():
            # 使用pinyin_or_word函数判断是否是合法的拼音
            return self.is_pinyin(word.lower())
        return False

    def encoder(self, inputs):
        encoded_inputs = []
        self.code = []  # 清空 self.code
        for i, word in enumerate(inputs):
            if self.is_valid_chinese(word):
                self.code.append((i, word))  # 将需要过滤的中文单词的索引和拼音存储到 self.code 中
            else:
                encoded_inputs.append(word)
        return encoded_inputs

    def decoder(self, inputs):
        decoded_inputs = inputs.copy()
        for i, word in self.code:
            decoded_inputs.insert(i, word)  # 根据索引将过滤的中文单词还原到原位置
        return decoded_inputs

    def is_pinyin(self, string):
        '''
        judge a string is a pinyin or a english word.
        pinyin_Lib comes from a txt file.
        '''
        string = string.lower()
        stringlen = len(string)
        max_len = 6
        result = []
        n = 0
        while n < stringlen:
            matched = 0
            temp_result = []
            for i in range(max_len, 0, -1):
                s = string[0:i]
                if s in self.pinyin_lib:
                    temp_result.append(string[:i])
                    matched = i
                    break
                if i == 1 and len(temp_result) == 0:
                    return False
            result.extend(temp_result)
            string = string[matched:]
            n += matched
        return True 

script_dir = os.path.dirname(os.path.abspath(__file__))
parent_dir = os.path.dirname(os.path.dirname(os.path.dirname(script_dir)))

class Model():
    def __init__(self, modelname, selected_lora_model, selected_gpu):
        def get_gpu_index(gpu_info, target_gpu_name):
            """
            从 GPU 信息中获取目标 GPU 的索引
            Args:
                gpu_info (list): 包含 GPU 名称的列表
                target_gpu_name (str): 目标 GPU 的名称

            Returns:
                int: 目标 GPU 的索引，如果未找到则返回 -1
            """
            for i, name in enumerate(gpu_info):
                if target_gpu_name.lower() in name.lower():
                    return i
            return -1
        if selected_gpu != "cpu":
            gpu_count = torch.cuda.device_count()
            gpu_info = [torch.cuda.get_device_name(i) for i in range(gpu_count)]
            selected_gpu_index = get_gpu_index(gpu_info, selected_gpu)
            self.device_name = f"cuda:{selected_gpu_index}"
        else:
            self.device_name = "cpu"
        print("device_name", self.device_name)
        self.model = AutoModelForSeq2SeqLM.from_pretrained(modelname).to(self.device_name)
        self.tokenizer = AutoTokenizer.from_pretrained(modelname)
        # self.translator = pipeline('translation', model=self.original_model, tokenizer=self.tokenizer, src_lang=original_language, tgt_lang=target_language, device=device)
    
    def generate(self, inputs, original_language, target_languages, max_batch_size):
        filter_list = [SpecialTokenFilter(), SperSignFilter(), ParenSParenFilter(), ChevronsFilter(), SimilarFilter(), ChineseFilter()]
        filter_pipeline = FilterPipeline(filter_list)
        def language_mapping(original_language):
            d = {
                "Achinese (Arabic script)": "ace_Arab",
                "Achinese (Latin script)": "ace_Latn",
                "Mesopotamian Arabic": "acm_Arab",
                "Ta'izzi-Adeni Arabic": "acq_Arab",
                "Tunisian Arabic": "aeb_Arab",
                "Afrikaans": "afr_Latn",
                "South Levantine Arabic": "ajp_Arab",
                "Akan": "aka_Latn",
                "Amharic": "amh_Ethi",
                "North Levantine Arabic": "apc_Arab",
                "Standard Arabic": "arb_Arab",
                "Najdi Arabic": "ars_Arab",
                "Moroccan Arabic": "ary_Arab",
                "Egyptian Arabic": "arz_Arab",
                "Assamese": "asm_Beng",
                "Asturian": "ast_Latn",
                "Awadhi": "awa_Deva",
                "Central Aymara": "ayr_Latn",
                "South Azerbaijani": "azb_Arab",
                "North Azerbaijani": "azj_Latn",
                "Bashkir": "bak_Cyrl",
                "Bambara": "bam_Latn",
                "Balinese": "ban_Latn",
                "Belarusian": "bel_Cyrl",
                "Bemba": "bem_Latn",
                "Bengali": "ben_Beng",
                "Bhojpuri": "bho_Deva",
                "Banjar (Arabic script)": "bjn_Arab",
                "Banjar (Latin script)": "bjn_Latn",
                "Tibetan": "bod_Tibt",
                "Bosnian": "bos_Latn",
                "Buginese": "bug_Latn",
                "Bulgarian": "bul_Cyrl",
                "Catalan": "cat_Latn",
                "Cebuano": "ceb_Latn",
                "Czech": "ces_Latn",
                "Chokwe": "cjk_Latn",
                "Central Kurdish": "ckb_Arab",
                "Crimean Tatar": "crh_Latn",
                "Welsh": "cym_Latn",
                "Danish": "dan_Latn",
                "German": "deu_Latn",
                "Dinka": "dik_Latn",
                "Jula": "dyu_Latn",
                "Dzongkha": "dzo_Tibt",
                "Greek": "ell_Grek",
                "English": "eng_Latn",
                "Esperanto": "epo_Latn",
                "Estonian": "est_Latn",
                "Basque": "eus_Latn",
                "Ewe": "ewe_Latn",
                "Faroese": "fao_Latn",
                "Persian": "pes_Arab",
                "Fijian": "fij_Latn",
                "Finnish": "fin_Latn",
                "Fon": "fon_Latn",
                "French": "fra_Latn",
                "Friulian": "fur_Latn",
                "Nigerian Fulfulde": "fuv_Latn",
                "Scottish Gaelic": "gla_Latn",
                "Irish": "gle_Latn",
                "Galician": "glg_Latn",
                "Guarani": "grn_Latn",
                "Gujarati": "guj_Gujr",
                "Haitian Creole": "hat_Latn",
                "Hausa": "hau_Latn",
                "Hebrew": "heb_Hebr",
                "Hindi": "hin_Deva",
                "Chhattisgarhi": "hne_Deva",
                "Croatian": "hrv_Latn",
                "Hungarian": "hun_Latn",
                "Armenian": "hye_Armn",
                "Igbo": "ibo_Latn",
                "Iloko": "ilo_Latn",
                "Indonesian": "ind_Latn",
                "Icelandic": "isl_Latn",
                "Italian": "ita_Latn",
                "Javanese": "jav_Latn",
                "Japanese": "jpn_Jpan",
                "Kabyle": "kab_Latn",
                "Kachin": "kac_Latn",
                "Arabic": "ar_AR",
                "Chinese": "zho_Hans", 
                "Spanish": "spa_Latn",
                "Dutch": "nld_Latn", 
                "Kazakh": "kaz_Cyrl", 
                "Korean": "kor_Hang", 
                "Lithuanian": "lit_Latn",
                "Malayalam": "mal_Mlym", 
                "Marathi": "mar_Deva", 
                "Nepali": "ne_NP", 
                "Polish": "pol_Latn", 
                "Portuguese": "por_Latn", 
                "Russian": "rus_Cyrl", 
                "Sinhala": "sin_Sinh",
                "Tamil": "tam_Taml", 
                "Turkish": "tur_Latn", 
                "Ukrainian": "ukr_Cyrl", 
                "Urdu": "urd_Arab", 
                "Vietnamese": "vie_Latn", 
                "Thai":"tha_Thai",
                "Khmer":"khm_Khmr"
            }
            return d[original_language]
        def process_gpu_translate_result(temp_outputs):
            outputs = []
            for temp_output in temp_outputs:
                length = len(temp_output[0]["generated_translation"])
                for i in range(length):
                    temp = []
                    for trans in temp_output:
                        temp.append({
                            "target_language": trans["target_language"],
                            "generated_translation": trans['generated_translation'][i],
                        })
                    outputs.append(temp)
            excel_writer = ExcelFileWriter()
            excel_writer.write_text(os.path.join(parent_dir,r"temp/empty.xlsx"), outputs, 'A', 1, len(outputs))
        self.tokenizer.src_lang = language_mapping(original_language)
        if self.device_name == "cpu":
            # Tokenize input
            input_ids = self.tokenizer(inputs, return_tensors="pt", padding=True, max_length=128).to(self.device_name)
            output = []
            for target_language in target_languages:
                # Get language code for the target language
                target_lang_code = self.tokenizer.lang_code_to_id[language_mapping(target_language)]
                # Generate translation
                generated_tokens = self.model.generate(
                    **input_ids,
                    forced_bos_token_id=target_lang_code,
                    max_length=128
                )
                generated_translation = self.tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
                # Append result to output
                output.append({
                    "target_language": target_language,
                    "generated_translation": generated_translation,
                })
            outputs = []
            length = len(output[0]["generated_translation"])
            for i in range(length):
                temp = []
                for trans in output:
                    temp.append({
                        "target_language": trans["target_language"],
                        "generated_translation": trans['generated_translation'][i],
                    })
                outputs.append(temp)
            return outputs
        else:
            # 最大批量大小 = 可用 GPU 内存字节数 / 4 / （张量大小 + 可训练参数）
            # max_batch_size = 10
            # Ensure batch size is within model limits:
            print("length of inputs: ",len(inputs))
            batch_size = min(len(inputs), int(max_batch_size))
            batches = [inputs[i:i + batch_size] for i in range(0, len(inputs), batch_size)]
            print("length of batches size: ", len(batches))
            temp_outputs = []
            processed_num = 0
            for index, batch in enumerate(batches):
                # Tokenize input
                print(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>")
                print(len(batch))
                print(batch)
                batch = filter_pipeline.batch_encoder(batch)
                print(batch)
                temp = []
                if len(batch) > 0:
                    input_ids = self.tokenizer(batch, return_tensors="pt", padding=True).to(self.device_name)
                    for target_language in target_languages:
                        target_lang_code = self.tokenizer.lang_code_to_id[language_mapping(target_language)]
                        generated_tokens = self.model.generate(
                            **input_ids,
                            forced_bos_token_id=target_lang_code,
                        )
                        generated_translation = self.tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
                        
                        print(generated_translation)
                        generated_translation = filter_pipeline.batch_decoder(generated_translation)
                        print(generated_translation)
                        print(len(generated_translation))
                        # Append result to output
                        temp.append({
                            "target_language": target_language,
                            "generated_translation": generated_translation,
                        })
                    input_ids.to('cpu')
                    del input_ids
                else:
                    for target_language in target_languages:
                        generated_translation = filter_pipeline.batch_decoder(batch)
                        print(generated_translation)
                        print(len(generated_translation))
                        # Append result to output
                        temp.append({
                            "target_language": target_language,
                            "generated_translation": generated_translation,
                        })
                temp_outputs.append(temp)
                processed_num += len(batch)
                if (index + 1) * max_batch_size // 1000 - index  * max_batch_size // 1000 == 1:
                    print("Already processed number: ", len(temp_outputs))
                    process_gpu_translate_result(temp_outputs)
            outputs = []
            for temp_output in temp_outputs:
                length = len(temp_output[0]["generated_translation"])
                for i in range(length):
                    temp = []
                    for trans in temp_output:
                        temp.append({
                            "target_language": trans["target_language"],
                            "generated_translation": trans['generated_translation'][i],
                        })
                    outputs.append(temp)
            return outputs
        for filter in self._filter_list:
            inputs = filter.encoder(inputs)
        return inputs
    
    def batch_decoder(self, inputs):
        for filter in reversed(self._filter_list):
            inputs = filter.decoder(inputs)
        return inputs