import os.path
import urllib.parse
from pathlib import Path
from PIL import PngImagePlugin

from modules import shared
from modules.images import read_info_from_image
import gradio as gr
import json
import html

from modules.generation_parameters_copypaste import image_from_url_text

extra_pages = []
allowed_dirs = set()


def register_page(page):
    """registers extra networks page for the UI; recommend doing it in on_before_ui() callback for extensions"""

    extra_pages.append(page)
    allowed_dirs.clear()
    allowed_dirs.update(set(sum([x.allowed_directories_for_previews() for x in extra_pages], [])))


def fetch_file(filename: str = ""):
    from starlette.responses import FileResponse

    if not any(Path(x).absolute() in Path(filename).absolute().parents for x in allowed_dirs):
        raise ValueError(f"File cannot be fetched: {filename}. Must be in one of directories registered by extra pages.")

    ext = os.path.splitext(filename)[1].lower()
    if ext not in (".png", ".jpg", ".jpeg", ".webp"):
        raise ValueError(f"File cannot be fetched: {filename}. Only png and jpg and webp.")

    # would profit from returning 304
    return FileResponse(filename, headers={"Accept-Ranges": "bytes"})


def get_metadata(page: str = "", item: str = ""):
    from starlette.responses import JSONResponse

    page = next(iter([x for x in extra_pages if x.name == page]), None)
    if page is None:
        return JSONResponse({})

    metadata = page.metadata.get(item)
    if metadata is None:
        return JSONResponse({})

    return JSONResponse({"metadata": metadata})


def add_pages_to_demo(app):
    app.add_api_route("/sd_extra_networks/thumb", fetch_file, methods=["GET"])
    app.add_api_route("/sd_extra_networks/metadata", get_metadata, methods=["GET"])


class ExtraNetworksPage:
    def __init__(self, title):
        self.title = title
        self.name = title.lower()
        self.card_page = shared.html("extra-networks-card.html")
        self.allow_negative_prompt = False
        self.metadata = {}

    def refresh(self):
        pass

    def link_preview(self, filename):
        quoted_filename = urllib.parse.quote(filename.replace('\\', '/'))
        mtime = os.path.getmtime(filename)
        return f"./sd_extra_networks/thumb?filename={quoted_filename}&mtime={mtime}"

    def search_terms_from_path(self, filename, possible_directories=None):
        abspath = os.path.abspath(filename)

        for parentdir in (possible_directories if possible_directories is not None else self.allowed_directories_for_previews()):
            parentdir = os.path.abspath(parentdir)
            if abspath.startswith(parentdir):
                return abspath[len(parentdir):].replace('\\', '/')

        return ""

    def create_html(self, tabname):
        view = shared.opts.extra_networks_default_view
        items_html = ''

        self.metadata = {}

        subdirs = {}
        for parentdir in [os.path.abspath(x) for x in self.allowed_directories_for_previews()]:
            for root, dirs, _ in os.walk(parentdir, followlinks=True):
                for dirname in dirs:
                    x = os.path.join(root, dirname)

                    if not os.path.isdir(x):
                        continue

                    subdir = os.path.abspath(x)[len(parentdir):].replace("\\", "/")
                    while subdir.startswith("/"):
                        subdir = subdir[1:]

                    is_empty = len(os.listdir(x)) == 0
                    if not is_empty and not subdir.endswith("/"):
                        subdir = subdir + "/"

                    subdirs[subdir] = 1

        if subdirs:
            subdirs = {"": 1, **subdirs}

        subdirs_html = "".join([f"""
<button class='lg secondary gradio-button custom-button{" search-all" if subdir=="" else ""}' onclick='extraNetworksSearchButton("{tabname}_extra_tabs", event)'>
{html.escape(subdir if subdir!="" else "all")}
</button>
""" for subdir in subdirs])

        for item in self.list_items():
            metadata = item.get("metadata")
            if metadata:
                self.metadata[item["name"]] = metadata

            items_html += self.create_html_for_item(item, tabname)

        if items_html == '':
            dirs = "".join([f"<li>{x}</li>" for x in self.allowed_directories_for_previews()])
            items_html = shared.html("extra-networks-no-cards.html").format(dirs=dirs)

        self_name_id = self.name.replace(" ", "_")

        res = f"""
<div id='{tabname}_{self_name_id}_subdirs' class='extra-network-subdirs extra-network-subdirs-{view}'>
{subdirs_html}
</div>
<div id='{tabname}_{self_name_id}_cards' class='extra-network-{view}'>
{items_html}
</div>
"""

        return res

    def list_items(self):
        raise NotImplementedError()

    def allowed_directories_for_previews(self):
        return []

    def create_html_for_item(self, item, tabname):
        preview = item.get("preview", None)

        onclick = item.get("onclick", None)
        if onclick is None:
            onclick = '"' + html.escape(f"""return cardClicked({json.dumps(tabname)}, {item["prompt"]}, {"true" if self.allow_negative_prompt else "false"})""") + '"'

        height = f"height: {shared.opts.extra_networks_card_height}px;" if shared.opts.extra_networks_card_height else ''
        width = f"width: {shared.opts.extra_networks_card_width}px;" if shared.opts.extra_networks_card_width else ''
        background_image = f"background-image: url(\"{html.escape(preview)}\");" if preview else ''
        metadata_button = ""
        metadata = item.get("metadata")
        if metadata:
            metadata_button = f"<div class='metadata-button' title='Show metadata' onclick='extraNetworksRequestMetadata(event, {json.dumps(self.name)}, {json.dumps(item['name'])})'></div>"

        local_path = ""
        filename = item.get("filename", "")
        for reldir in self.allowed_directories_for_previews():
            absdir = os.path.abspath(reldir)

            if filename.startswith(absdir):
                local_path = filename[len(absdir):]

        # if this is true, the item must not be show in the default view, and must instead only be
        # shown when searching for it
        search_only = "/." in local_path or "\\." in local_path

        args = {
            "style": f"'display: none; {height}{width}{background_image}'",
            "prompt": item.get("prompt", None),
            "tabname": json.dumps(tabname),
            "local_preview": json.dumps(item["local_preview"]),
            "name": item["name"],
            "description": (item.get("description") or ""),
            "card_clicked": onclick,
            "save_card_preview": '"' + html.escape(f"""return saveCardPreview(event, {json.dumps(tabname)}, {json.dumps(item["local_preview"])})""") + '"',
            "search_term": item.get("search_term", ""),
            "metadata_button": metadata_button,
            "search_only": " search_only" if search_only else "",
        }

        return self.card_page.format(**args)

    def find_preview(self, path):
        """
        Find a preview PNG for a given path (without extension) and call link_preview on it.
        """

        preview_extensions = ["png", "jpg", "jpeg", "webp"]
        if shared.opts.samples_format not in preview_extensions:
            preview_extensions.append(shared.opts.samples_format)

        potential_files = sum([[path + "." + ext, path + ".preview." + ext] for ext in preview_extensions], [])

        for file in potential_files:
            if os.path.isfile(file):
                return self.link_preview(file)

        return None

    def find_description(self, path):
        """
        Find and read a description file for a given path (without extension).
        """
        for file in [f"{path}.txt", f"{path}.description.txt"]:
            try:
                with open(file, "r", encoding="utf-8", errors="replace") as f:
                    return f.read()
            except OSError:
                pass
        return None


def intialize():
    extra_pages.clear()


class ExtraNetworksUi:
    def __init__(self):
        self.pages = None
        """gradio HTML components related to extra networks' pages"""

        self.page_contents = None
        """HTML content of the above; empty initially, filled when extra pages have to be shown"""

        self.stored_extra_pages = None

        self.button_save_preview = None
        self.preview_target_filename = None

        self.tabname = None


def pages_in_preferred_order(pages):
    tab_order = [x.lower().strip() for x in shared.opts.ui_extra_networks_tab_reorder.split(",")]

    def tab_name_score(name):
        name = name.lower()
        for i, possible_match in enumerate(tab_order):
            if possible_match in name:
                return i

        return len(pages)

    tab_scores = {page.name: (tab_name_score(page.name), original_index) for original_index, page in enumerate(pages)}

    return sorted(pages, key=lambda x: tab_scores[x.name])


def create_ui(container, button, tabname):
    ui = ExtraNetworksUi()
    ui.pages = []
    ui.pages_contents = []
    ui.stored_extra_pages = pages_in_preferred_order(extra_pages.copy())
    ui.tabname = tabname

    with gr.Tabs(elem_id=tabname+"_extra_tabs"):
        for page in ui.stored_extra_pages:
            page_id = page.title.lower().replace(" ", "_")

            with gr.Tab(page.title, id=page_id):
                elem_id = f"{tabname}_{page_id}_cards_html"
                page_elem = gr.HTML('Loading...', elem_id=elem_id)
                ui.pages.append(page_elem)

                page_elem.change(fn=lambda: None, _js='function(){applyExtraNetworkFilter(' + json.dumps(tabname) + '); return []}', inputs=[], outputs=[])

    gr.Textbox('', show_label=False, elem_id=tabname+"_extra_search", placeholder="Search...", visible=False)
    button_refresh = gr.Button('Refresh', elem_id=tabname+"_extra_refresh")

    ui.button_save_preview = gr.Button('Save preview', elem_id=tabname+"_save_preview", visible=False)
    ui.preview_target_filename = gr.Textbox('Preview save filename', elem_id=tabname+"_preview_filename", visible=False)

    def toggle_visibility(is_visible):
        is_visible = not is_visible

        return is_visible, gr.update(visible=is_visible), gr.update(variant=("secondary-down" if is_visible else "secondary"))

    def fill_tabs(is_empty):
        """Creates HTML for extra networks' tabs when the extra networks button is clicked for the first time."""

        if not ui.pages_contents:
            refresh()

        if is_empty:
            return True, *ui.pages_contents

        return True, *[gr.update() for _ in ui.pages_contents]

    state_visible = gr.State(value=False)
    button.click(fn=toggle_visibility, inputs=[state_visible], outputs=[state_visible, container, button], show_progress=False)

    state_empty = gr.State(value=True)
    button.click(fn=fill_tabs, inputs=[state_empty], outputs=[state_empty, *ui.pages], show_progress=False)

    def refresh():
        for pg in ui.stored_extra_pages:
            pg.refresh()

        ui.pages_contents = [pg.create_html(ui.tabname) for pg in ui.stored_extra_pages]

        return ui.pages_contents

    button_refresh.click(fn=refresh, inputs=[], outputs=ui.pages)

    return ui


def path_is_parent(parent_path, child_path):
    parent_path = os.path.abspath(parent_path)
    child_path = os.path.abspath(child_path)

    return child_path.startswith(parent_path)


def setup_ui(ui, gallery):
    def save_preview(index, images, filename):
        if len(images) == 0:
            print("There is no image in gallery to save as a preview.")
            return [page.create_html(ui.tabname) for page in ui.stored_extra_pages]

        index = int(index)
        index = 0 if index < 0 else index
        index = len(images) - 1 if index >= len(images) else index

        img_info = images[index if index >= 0 else 0]
        image = image_from_url_text(img_info)
        geninfo, items = read_info_from_image(image)

        is_allowed = False
        for extra_page in ui.stored_extra_pages:
            if any(path_is_parent(x, filename) for x in extra_page.allowed_directories_for_previews()):
                is_allowed = True
                break

        assert is_allowed, f'writing to {filename} is not allowed'

        if geninfo:
            ext = os.path.splitext(filename)[1].lower()
            if ext == '.png':
                pnginfo_data = PngImagePlugin.PngInfo()
                pnginfo_data.add_text('parameters', geninfo)
                image.save(filename, pnginfo=pnginfo_data)
            elif ext in ('.jpg', '.jpeg', '.webp'):
                exif_bytes = piexif.dump({
                    'Exif': {piexif.ExifIFD.UserComment: piexif.helper.UserComment.dump(geninfo or '',
                                                                                        encoding='unicode')}
                })
                image.save(filename, exif=exif_bytes, quality=shared.opts.jpeg_quality)
            else:
                image.save(filename)
        else:
            image.save(filename)

        return [page.create_html(ui.tabname) for page in ui.stored_extra_pages]

    ui.button_save_preview.click(
        fn=save_preview,
        _js="function(x, y, z){return [selected_gallery_index(), y, z]}",
        inputs=[ui.preview_target_filename, gallery, ui.preview_target_filename],
        outputs=[*ui.pages]
    )

