import os, json, shutil, re, docx, docx2txt, piexif, cv2
from docx.shared import Inches
from docx import Document
import piexif.helper
import numpy as np
import os.path as osp
from typing import Tuple, Union, List, Dict
from PIL import Image

from .logger import logger as LOGGER
from .io_utils import find_all_imgs, imread, imwrite, NumpyEncoder
from .textblock import TextBlock, FontFormat
from .config import pcfg
from . import shared
from .exceptions import ImgnameNotInProjectException, ProjectLoadFailureException, ProjectDirNotExistException, ProjectNotSupportedException


def get_last_modified_file(file_prefix, exts, ext_fallback=None):
    '''
    get last modified file from files sharing same prefix
    '''
    latest_time = -1
    latest_f = None
    for ext in exts:
        tmp_p = file_prefix + ext
        if osp.exists(tmp_p) and osp.getmtime(tmp_p) > latest_time:
            latest_time = osp.getmtime(tmp_p)
            latest_f = tmp_p
    if latest_f is None:
        if ext_fallback is not None:
            latest_f = file_prefix + ext_fallback
        else:
            latest_f = file_prefix + exts[0]
    return latest_f


def write_jpg_metadata(imgpath: str, metadata="a metadata"):
    exif_dict = {"Exif":{piexif.ExifIFD.UserComment: piexif.helper.UserComment.dump(metadata, encoding='unicode')}}
    exif_bytes = piexif.dump(exif_dict)
    piexif.insert(exif_bytes, imgpath)

def read_jpg_metadata(imgpath: str):
    exif_dict = piexif.load(imgpath)
    user_comment = piexif.helper.UserComment.load(exif_dict["Exif"][piexif.ExifIFD.UserComment])
    bubdict = json.loads(user_comment)
    return bubdict

page_start_pattern = re.compile(r'^###\s+', re.MULTILINE)
text_blkid_start_pattern = re.compile(r'^\d+\.', re.MULTILINE)

def parse_txt_translation(file_path: str):
    with open(file_path, 'r', encoding='utf8') as f:
        content = f.read()
    page_start = None
    page_list = []
    for matched in page_start_pattern.finditer(content):
        start, end = matched.span()
        if page_start is not None:
            page_list.append({'page_content': content[page_start: start]})
        page_start = start
    if page_start is not None:
        page_list.append({'page_content': content[page_start:]})

    for page_dict in page_list:
        page_content = page_dict['page_content']
        page_dict['page_name'] = page_start_pattern.sub('', page_content.split('\n')[0]).strip()
        blkid_start = blkid_end = None
        blk_list = []
        for matched in text_blkid_start_pattern.finditer(page_content):
            start, end = matched.span()
            if blkid_start is not None:
                blk_list.append(page_content[blkid_end: start].strip())
            blkid_start = start
            blkid_end = end
        if blkid_start is not None:
            blk_list.append(page_content[blkid_end:].strip())
        page_dict['blk_list'] = blk_list

    return page_list


class TextBlkEncoder(NumpyEncoder):
    def default(self, obj):
        if isinstance(obj, TextBlock):
            return obj.to_dict()
        elif isinstance(obj, FontFormat):
            return vars(obj)
        return NumpyEncoder.default(self, obj)


class ProjImgTrans:

    def __init__(self, directory: str = None):
        self.type = 'imgtrans'
        self.directory: str = None
        self.pages: Dict[str, List[TextBlock]] = {}
        self._pagename2idx = {}
        self._idx2pagename = {}

        self._fuzzy_inpainted_list = None

        self.not_found_pages: Dict[str, List[TextBlock]] = {}
        self.new_pages: List[str] = []
        self.proj_path: str = None

        self.current_img: str = None
        self.img_array: np.ndarray = None
        self.mask_array: np.ndarray = None
        self.inpainted_array: np.ndarray = None
        if directory is not None:
            self.load(directory)

    def idx2pagename(self, idx: int) -> str:
        return self._idx2pagename[idx]

    def pagename2idx(self, pagename: str) -> int:
        if pagename in self.pages:
            return self._pagename2idx[pagename]
        return -1

    def proj_name(self) -> str:
        return self.type+'_'+osp.basename(self.directory)

    def load(self, directory: str, json_path: str = None) -> bool:
        self.directory = directory
        if json_path is None:
            self.proj_path = osp.join(self.directory, self.proj_name() + '.json')
        else:
            self.proj_path = json_path
        new_proj = False
        if not osp.exists(self.proj_path):
            new_proj = True
            self.new_project()
        else:
            try:
                with open(self.proj_path, 'r', encoding='utf8') as f:
                    proj_dict = json.loads(f.read())
            except Exception as e:
                raise ProjectLoadFailureException(e)
            self.load_from_dict(proj_dict)
        if not osp.exists(self.inpainted_dir()):
            os.makedirs(self.inpainted_dir())
        if not osp.exists(self.mask_dir()):
            os.makedirs(self.mask_dir())

        return new_proj

    def mask_dir(self):
        return osp.join(self.directory, 'mask')

    def inpainted_dir(self):
        return osp.join(self.directory, 'inpainted')

    def result_dir(self):
        return osp.join(self.directory, 'result')

    def load_from_dict(self, proj_dict: dict):
        self.set_current_img(None)
        try:
            self.pages = {}
            self._pagename2idx = {}
            self._idx2pagename = {}
            self.not_found_pages = {}
            page_dict = proj_dict['pages']
            not_found_pages = list(page_dict.keys())
            found_pages = find_all_imgs(img_dir=self.directory, abs_path=False, sort=True)
            for ii, imname in enumerate(found_pages):
                if imname in page_dict:
                    self.pages[imname] = [TextBlock(**blk_dict) for blk_dict in page_dict[imname]]
                    not_found_pages.remove(imname)
                else:
                    self.pages[imname] = []
                    self.new_pages.append(imname)
                self._pagename2idx[imname] = ii
                self._idx2pagename[ii] = imname
            for imname in not_found_pages:
                self.not_found_pages[imname] = [TextBlock(**blk_dict) for blk_dict in page_dict[imname]]
        except Exception as e:
            raise ProjectNotSupportedException(e)
        set_img_failed = False
        if 'current_img' in proj_dict:
            current_img = proj_dict['current_img']
            try:
                self.set_current_img(current_img)
            except ImgnameNotInProjectException:
                set_img_failed = True
        else:
            set_img_failed = True
            LOGGER.warning(f'{current_img} not found.')
        if set_img_failed:
            if len(self.pages) > 0:
                self.set_current_img_byidx(0)

    def load_translation_from_txt(self, file_path: str):
        page_list = parse_txt_translation(file_path)
        missing_pages = []
        unmatched_pages = []
        unexpected_pages = []
        matched_pages = []
        for page_dict in page_list:
            page_name = page_dict['page_name']
            if page_name in self.pages:
                matched_pages.append(page_name)
            else:
                unexpected_pages.append(page_name)
                continue
            blklist = self.pages[page_name]
            n_blk = len(blklist)
            src_blk_list = page_dict['blk_list']
            n_src_blk = len(src_blk_list)
            if n_src_blk != n_blk:
                LOGGER.warning(f'Unmatched text blocks in {page_name}, number of text blocks in this page vs source file: {n_blk}-{n_src_blk}')
                unmatched_pages.append(page_name)
            for blkid in range(min(n_blk, n_src_blk)):
                blk = blklist[blkid]
                blk.rich_text = ''
                blk.translation = src_blk_list[blkid]

        matched_pages = set(matched_pages)
        if len(matched_pages) != self.num_pages:
            for page_name in self.pages:
                if page_name not in matched_pages:
                    missing_pages.append(page_name)
        
        all_matched = len(missing_pages) == 0 and len(unmatched_pages) == 0 and len(unexpected_pages) == 0
        return all_matched, {'missing_pages': missing_pages, 'unmatched_pages': unmatched_pages, 'unexpected_pages': unexpected_pages, 'matched_pages': matched_pages}

    def load_from_json(self, json_path: str):
        old_dir = self.directory
        directory = osp.dirname(json_path)
        try:
            self.load(directory, json_path=json_path)
        except Exception as e:
            self.load(old_dir)
            raise ProjectLoadFailureException(e)

    def set_current_img(self, imgname: str):
        if imgname is not None:
            if imgname not in self.pages:
                raise ImgnameNotInProjectException
            self.current_img = imgname
            img_path = self.current_img_path()
            mask_path = self.get_mask_path(get_last_modified=True)
            self.img_array = imread(img_path)
            im_h, im_w = self.img_array.shape[:2]
            if osp.exists(mask_path):
                self.mask_array = imread(mask_path, cv2.IMREAD_GRAYSCALE)
            else:
                self.mask_array = np.zeros((im_h, im_w), dtype=np.uint8)
            self.inpainted_array = self.load_inpainted_by_imgname(imgname)
            if self.inpainted_array is None:
                self.inpainted_array = np.copy(self.img_array)
        else:
            self.current_img = None
            self.img_array = None
            self.mask_array = None
            self.inpainted_array = None

    def current_has_alpha(self):
        if self.current_img is None:
            return False
        return len(self.img_array.shape) and self.img_array.shape[-1] == 4

    def set_current_img_byidx(self, idx: int):
        num_pages = self.num_pages
        if idx < 0:
            idx = idx + self.num_pages
        if idx < 0 or idx > num_pages - 1:
            self.set_current_img(None)
        else:
            self.set_current_img(self.idx2pagename(idx))

    def get_blklist_byidx(self, idx: int) -> List[TextBlock]:
        return self.pages[self.idx2pagename(idx)]

    @property
    def num_pages(self) -> int:
        return len(self.pages)

    @property
    def current_idx(self) -> int:
        return self.pagename2idx(self.current_img)

    def new_project(self):
        if not osp.exists(self.directory):
            raise ProjectDirNotExistException
        self.set_current_img(None)
        imglist = find_all_imgs(self.directory, abs_path=False, sort=True)
        self.pages = {}
        self._pagename2idx = {}
        self._idx2pagename = {}
        for ii, imgname in enumerate(imglist):
            self.pages[imgname] = []
            self._pagename2idx[imgname] = ii
            self._idx2pagename[ii] = imgname
        self.set_current_img_byidx(0)
        self.save()
        
    def save(self, keep_exist_as_backup=False):
        if not osp.exists(self.directory):
            raise ProjectDirNotExistException
        tmp_save_tgt = self.proj_path + '.tmp'
        try:
            with open(tmp_save_tgt, "w", encoding="utf-8") as f:
                f.write(json.dumps(self.to_dict(), ensure_ascii=False, cls=TextBlkEncoder))
        except:
            raise Exception(f'Failed to write {self.to_dict()}')
        if osp.exists(self.proj_path) and keep_exist_as_backup:
            os.replace(self.proj_path, self.proj_path + '.backup')
            os.replace(tmp_save_tgt, self.proj_path)
        else:
            os.replace(tmp_save_tgt, self.proj_path)
        LOGGER.debug(f'project saved to {self.proj_path}')

    def to_dict(self) -> Dict:
        pages = self.pages.copy()
        pages.update(self.not_found_pages)
        return {
            'directory': self.directory,
            'pages': pages,
            'current_img': self.current_img,
        }

    def read_img(self, imgname: str) -> np.ndarray:
        if imgname not in self.pages:
            raise ImgnameNotInProjectException
        return imread(osp.join(self.directory, imgname))

    def save_mask(self, img_name, mask: np.ndarray):
        imwrite(self.get_mask_path(img_name), mask, ext=pcfg.intermediate_imgsave_ext)

    def save_inpainted(self, img_name, inpainted: np.ndarray):
        imwrite(self.get_inpainted_path(img_name), inpainted, ext=pcfg.intermediate_imgsave_ext)

    def current_img_path(self) -> str:
        if self.current_img is None:
            return None
        return osp.join(self.directory, self.current_img)

    def get_mask_path(self, imgname: str = None, get_last_modified=False) -> str:
        if imgname is None:
            imgname = self.current_img

        fileprefix = osp.join(self.mask_dir(), osp.splitext(imgname)[0])
        if get_last_modified:
            p = get_last_modified_file(fileprefix, ['.jxl', '.png'], ext_fallback=pcfg.intermediate_imgsave_ext)
        else:
            p = fileprefix+pcfg.intermediate_imgsave_ext

        return p
    
    def load_mask_by_imgname(self, imgname: str) -> np.ndarray:
        mask = None
        mp = self.get_mask_path(imgname, get_last_modified=True)
        if osp.exists(mp):
            mask = imread(mp, cv2.IMREAD_GRAYSCALE)
        return mask

    def get_inpainted_path(self, imgname: str = None, get_last_modified=False) -> str:
        if imgname is None:
            imgname = self.current_img

        fileprefix = osp.join(self.inpainted_dir(), osp.splitext(imgname)[0])
        if get_last_modified:
            p = get_last_modified_file(fileprefix, ['.jxl', '.png'], ext_fallback=pcfg.intermediate_imgsave_ext)
        else:
            p = fileprefix+pcfg.intermediate_imgsave_ext

        if not osp.exists(p) and shared.FUZZY_MATCH_IMAGE_NAME:
            if self._fuzzy_inpainted_list is None:
                if osp.exists(self.inpainted_dir()):
                    self._fuzzy_inpainted_list = find_all_imgs(self.inpainted_dir(), sort=True)
                else:
                    self._fuzzy_inpainted_list = []
            pidx = self.pagename2idx(imgname)
            if pidx < len(self._fuzzy_inpainted_list):
                return osp.join(self.inpainted_dir(), self._fuzzy_inpainted_list[pidx])
        return p
    
    def load_inpainted_by_imgname(self, imgname: str, scale_to_src: bool = True) -> np.ndarray:
        inpainted = None
        mp = self.get_inpainted_path(imgname, get_last_modified=True)
        if mp is not None and osp.exists(mp):
            inpainted = imread(mp)
            if imgname == self.current_img and self.img_array is not None:
                h, w = self.img_array.shape[:2]
            else:
                i = Image.open(osp.join(self.directory, imgname))
                h, w = i.height, i.width
            ih, iw = inpainted.shape[:2]
            if ih != h or iw != w:
                inpainted = Image.fromarray(inpainted).resize((w, h), resample=Image.Resampling.LANCZOS)
                inpainted = np.array(inpainted)
        return inpainted

    def get_result_path(self, imgname: str) -> str:
        ext = '.png'
        if pcfg is not None:
            if pcfg.imgsave_ext not in {'.jpg', '.png', '.webp', '.jxl'}:
                LOGGER.warning('invalid image saving ext in config.json')
            else:
                ext = pcfg.imgsave_ext
        return osp.join(self.result_dir(), osp.splitext(imgname)[0]+ext)
        
    def backup(self):
        raise NotImplementedError

    @property
    def is_empty(self):
        return len(self.pages) == 0

    @property
    def is_all_pages_no_text(self):
        return all([len(blklist) == 0 for blklist in self.pages.values()])

    @property
    def img_valid(self):
        return self.img_array is not None
    
    @property
    def mask_valid(self):
        return self.mask_array is not None

    @property
    def inpainted_valid(self):
        return self.inpainted_array is not None

    def set_next_img(self):
        if self.current_img is not None:
            next_idx = (self.current_idx + 1) % self.num_pages
            self.set_current_img(self.idx2pagename(next_idx))

    def set_prev_img(self):
        if self.current_img is not None:
            next_idx = (self.current_idx - 1 + self.num_pages) % self.num_pages
            self.set_current_img(self.idx2pagename(next_idx))

    def current_block_list(self) -> List[TextBlock]:
        if self.current_img is not None:
            assert self.current_img in self.pages
            return self.pages[self.current_img]
        else:
            return None

    def doc_path(self) -> str:
        return os.path.join(self.directory, self.proj_name() + ".docx")

    def doc_exist(self) -> bool:
        return osp.exists(self.doc_path())

    def dump_doc(self, delete_tmp_folder=True, fin_page_signal=None):
        
        cuts_dir = os.path.join(self.directory, "bubcuts")
        if os.path.exists(cuts_dir):
            shutil.rmtree(cuts_dir)
        os.mkdir(cuts_dir)
        
        document = Document()
        style = document.styles['Normal']
        font = style.font
        target_font = 'Arial'
        font.name = target_font
        for pagename, blklist in self.pages.items():
            imgpath = os.path.join(self.directory, pagename)
            
            cuts_path_list, cut_width_list = gen_ballon_cuts(cuts_dir, imgpath, blklist)
            paragraph = document.add_paragraph(pagename)
            paragraph.style = document.styles['Normal']
            table = document.add_table(rows=len(cuts_path_list), cols=2, style='Table Grid')

            for index, (cut_path, width) in enumerate(zip(cuts_path_list, cut_width_list)):
                run = table.cell(index, 0).paragraphs[0].add_run()
                run.style.font.name = target_font
                blk: TextBlock = blklist[index]
                bubdict = vars(blk).copy()
                bubdict["imgkey"] = pagename
                bubdict["rich_text"] = ''
                bubdict["text"] = blk.get_text()
                write_jpg_metadata(cut_path, metadata=json.dumps(bubdict, ensure_ascii=False, cls=TextBlkEncoder))
                run.add_picture(cut_path, width=Inches(width/96 * 0.85))
                table.cell(index, 1).text = bubdict["translation"]

            document.add_page_break()
            
            if fin_page_signal is not None:
                fin_page_signal.emit()
                # time.sleep(1)

        doc_path = self.doc_path()
        document.save(doc_path)
        if delete_tmp_folder:
            shutil.rmtree(cuts_dir)

    def dump_txt_path(self, dump_target, suffix):
        save_path = osp.join(self.directory, self.proj_name() + f'_{dump_target}{suffix}')
        return save_path

    def dump_txt(self, dump_target: str, suffix='.txt'):
        save_path = self.dump_txt_path(dump_target, suffix=suffix)
        text_all = []
        assert dump_target in {'source', 'translation'}
        assert suffix in {'.txt', '.md'}
        for page_name, blk_list in self.pages.items():
            text_in_page = ['### ' + page_name]
            for ii, blk in enumerate(blk_list):
                if dump_target == 'translation':
                    text = blk.translation.strip()
                elif dump_target == 'source':
                    text = blk.get_text().strip()
                text_in_page.append(f'{ii + 1}. {text}')
            text_all.append('\n\n'.join(text_in_page))
        with open(save_path, 'w', encoding='utf8') as f:
            f.write('\n\n\n'.join(text_all))

    def load_doc(self, doc_path, delete_tmp_folder=True, fin_page_signal=None):
        tmp_bubble_folder = osp.join(self.directory, 'img_folder')
        os.makedirs(tmp_bubble_folder, exist_ok=True)
        docx2txt.process(doc_path, tmp_bubble_folder)

        doc = docx.Document(doc_path)
        body_xml_str = doc._body._element.xml

        pages = {}
        bub_index = 0
        for tbl in re.findall(r'<w:tbl>(.*?)</w:tbl>', body_xml_str, re.DOTALL):
            for tr in re.findall(r'<w:tr(.*?)>(.*?)</w:tr>', tbl, re.DOTALL):
                if re.findall(r'<pic:cNvPr id=\"(.*?)\" name=\"(.*?)\"(.*?)>', tr[1]):
                    bub_index += 1
                    translation = ""
                    for paragraph in re.findall(r'<w:p(.*?)>(.*?)</w:p>', tr[1], re.DOTALL):
                        for wt in re.findall(r'<w:t>(.*?)</w:t>', paragraph[1], re.DOTALL):
                            translation += wt
                        translation += "\n"
                    translation = translation[:-1]
                    if len(translation) != 0 and translation[0] == "\n":
                        translation = translation[1:]


                    bubpath = os.path.join(tmp_bubble_folder, "image"+str(bub_index))
                    if osp.exists(bubpath+'.jpg'):
                        bubpath = bubpath + '.jpg'
                    else:
                        bubpath = bubpath + '.jpeg'

                    meta_dict = read_jpg_metadata(bubpath)
                    meta_dict["translation"] = translation
                    imgkey = meta_dict.pop("imgkey")
                    if not imgkey in pages:
                        pages[imgkey] = []
                    pages[imgkey].append(TextBlock(**meta_dict))
                    
                    if fin_page_signal is not None:
                        fin_page_signal.emit()

        self.merge_from_proj_dict(pages)
        if delete_tmp_folder:
            shutil.rmtree(tmp_bubble_folder)

    def merge_from_proj_dict(self, tgt_dict: Dict) -> Dict:
        if self.pages is None:
            self.pages = {}
        src_dict = self.pages if self.pages is not None else {}
        key_lst = list(dict.fromkeys(list(src_dict.keys()) + list(tgt_dict.keys())))
        key_lst.sort()
        rst_dict = {}
        pagename2idx = {}
        idx2pagename = {}
        page_counter = 0
        for key in key_lst:
            if key in src_dict and not key in tgt_dict:
                rst_dict[key] = src_dict[key]
            else:
                rst_dict[key] = tgt_dict[key]
            pagename2idx[key] = page_counter
            idx2pagename[page_counter] = key
            page_counter += 1
        self.pages.clear()
        self.pages.update(rst_dict)
        self._pagename2idx = pagename2idx
        self._idx2pagename = idx2pagename        


def gen_ballon_cuts(cuts_dir: str, imgpath: str, blk_list: List[TextBlock], resize=True) -> Tuple[List[str], List[int]]:
    img = imread(imgpath)
    imgname = os.path.basename(imgpath)
    cuts_path_list = []
    cut_width_list = []
    for ii, blk in enumerate(blk_list):
        
        x, y, w, h = blk.bounding_rect()
        x, y = max(x, 0), max(y, 0)
        w = max(w, 1)
        h = max(h, 1)
        x1, y1, x2, y2 = int(x), int(y), int(x+w), int(y+h)

        cut_path = os.path.join(cuts_dir, f'{imgname}-{ii}.jpg')
        bub = img[y1:y2, x1:x2]
        max_width = 448

        if bub.shape[0] < 1 or bub.shape[1] < 1:
            emptyw = 60
            resized = np.full((emptyw, emptyw, 3), fill_value=0, dtype=np.uint8)
            width = emptyw
        else:
            # scale_percent = 60 # percent of original size
            scale_percent = min(1920 / img.shape[0], max_width / w)
            
            if scale_percent < 1:
                width = max(1, int(bub.shape[1] * scale_percent))
                height = max(1, int(bub.shape[0] * scale_percent))
                dim = (width, height)
                resized = cv2.resize(bub, dim, interpolation = cv2.INTER_AREA) if resize else bub
            else:
                width = w
                resized = bub

        imwrite(cut_path, resized, '.jpg')
        cuts_path_list.append(cut_path)
        cut_width_list.append(width)

    return cuts_path_list, cut_width_list