import json
import os.path
import shutil
import sys
import time
import traceback

import git

import gradio as gr
import html
import shutil
import errno

from modules import extensions, shared, paths


available_extensions = {"extensions": []}


def check_access():
    assert not shared.cmd_opts.disable_extension_access, "extension access disabled because of command line flags"


def apply_and_restart(disable_list, update_list):
    check_access()

    disabled = json.loads(disable_list)
    assert type(disabled) == list, f"wrong disable_list data for apply_and_restart: {disable_list}"

    update = json.loads(update_list)
    assert type(update) == list, f"wrong update_list data for apply_and_restart: {update_list}"

    update = set(update)

    for ext in extensions.extensions:
        if ext.name not in update:
            continue

        try:
            ext.fetch_and_reset_hard()
        except Exception:
            print(f"Error getting updates for {ext.name}:", file=sys.stderr)
            print(traceback.format_exc(), file=sys.stderr)

    shared.opts.disabled_extensions = disabled
    shared.opts.save(shared.config_filename)

    shared.state.interrupt()
    shared.state.need_restart = True


def check_updates():
    check_access()

    for ext in extensions.extensions:
        if ext.remote is None:
            continue

        try:
            ext.check_updates()
        except Exception:
            print(f"Error checking updates for {ext.name}:", file=sys.stderr)
            print(traceback.format_exc(), file=sys.stderr)

    return extension_table()


def extension_table():
    code = f"""<!-- {time.time()} -->
    <table id="extensions">
        <thead>
            <tr>
                <th><abbr title="Use checkbox to enable the extension; it will be enabled or disabled when you click apply button">Extension</abbr></th>
                <th>URL</th>
                <th><abbr title="Use checkbox to mark the extension for update; it will be updated when you click apply button">Update</abbr></th>
            </tr>
        </thead>
        <tbody>
    """

    for ext in extensions.extensions:
        remote = ""
        if ext.is_builtin:
            remote = "built-in"
        elif ext.remote:
            remote = f"""<a href="{html.escape(ext.remote or '')}" target="_blank">{html.escape("built-in" if ext.is_builtin else ext.remote or '')}</a>"""

        if ext.can_update:
            ext_status = f"""<label><input class="gr-check-radio gr-checkbox" name="update_{html.escape(ext.name)}" checked="checked" type="checkbox">{html.escape(ext.status)}</label>"""
        else:
            ext_status = ext.status

        code += f"""
            <tr>
                <td><label><input class="gr-check-radio gr-checkbox" name="enable_{html.escape(ext.name)}" type="checkbox" {'checked="checked"' if ext.enabled else ''}>{html.escape(ext.name)}</label></td>
                <td>{remote}</td>
                <td{' class="extension_status"' if ext.remote is not None else ''}>{ext_status}</td>
            </tr>
    """

    code += """
        </tbody>
    </table>
    """

    return code


def normalize_git_url(url):
    if url is None:
        return ""

    url = url.replace(".git", "")
    return url


def install_extension_from_url(dirname, url):
    check_access()

    assert url, 'No URL specified'

    if dirname is None or dirname == "":
        *parts, last_part = url.split('/')
        last_part = normalize_git_url(last_part)

        dirname = last_part

    target_dir = os.path.join(extensions.extensions_dir, dirname)
    assert not os.path.exists(target_dir), f'Extension directory already exists: {target_dir}'

    normalized_url = normalize_git_url(url)
    assert len([x for x in extensions.extensions if normalize_git_url(x.remote) == normalized_url]) == 0, 'Extension with this URL is already installed'

    tmpdir = os.path.join(paths.script_path, "tmp", dirname)

    try:
        shutil.rmtree(tmpdir, True)

        repo = git.Repo.clone_from(url, tmpdir)
        repo.remote().fetch()

        try:
            os.rename(tmpdir, target_dir)
        except OSError as err:
            # TODO what does this do on windows? I think it'll be a different error code but I don't have a system to check it
            # Shouldn't cause any new issues at least but we probably want to handle it there too.
            if err.errno == errno.EXDEV:
                # Cross device link, typical in docker or when tmp/ and extensions/ are on different file systems
                # Since we can't use a rename, do the slower but more versitile shutil.move()
                shutil.move(tmpdir, target_dir)
            else:
                # Something else, not enough free space, permissions, etc.  rethrow it so that it gets handled.
                raise(err)

        import launch
        launch.run_extension_installer(target_dir)

        extensions.list_extensions()
        return [extension_table(), html.escape(f"Installed into {target_dir}. Use Installed tab to restart.")]
    finally:
        shutil.rmtree(tmpdir, True)


def install_extension_from_index(url, hide_tags):
    ext_table, message = install_extension_from_url(None, url)

    code, _ = refresh_available_extensions_from_data(hide_tags)

    return code, ext_table, message


def refresh_available_extensions(url, hide_tags):
    global available_extensions

    import urllib.request
    with urllib.request.urlopen(url) as response:
        text = response.read()

    available_extensions = json.loads(text)

    code, tags = refresh_available_extensions_from_data(hide_tags)

    return url, code, gr.CheckboxGroup.update(choices=tags), ''


def refresh_available_extensions_for_tags(hide_tags):
    code, _ = refresh_available_extensions_from_data(hide_tags)

    return code, ''


def refresh_available_extensions_from_data(hide_tags):
    extlist = available_extensions["extensions"]
    installed_extension_urls = {normalize_git_url(extension.remote): extension.name for extension in extensions.extensions}

    tags = available_extensions.get("tags", {})
    tags_to_hide = set(hide_tags)
    hidden = 0

    code = f"""<!-- {time.time()} -->
    <table id="available_extensions">
        <thead>
            <tr>
                <th>Extension</th>
                <th>Description</th>
                <th>Action</th>
            </tr>
        </thead>
        <tbody>
    """

    for ext in extlist:
        name = ext.get("name", "noname")
        url = ext.get("url", None)
        description = ext.get("description", "")
        extension_tags = ext.get("tags", [])

        if url is None:
            continue

        existing = installed_extension_urls.get(normalize_git_url(url), None)
        extension_tags = extension_tags + ["installed"] if existing else extension_tags

        if len([x for x in extension_tags if x in tags_to_hide]) > 0:
            hidden += 1
            continue

        install_code = f"""<input onclick="install_extension_from_index(this, '{html.escape(url)}')" type="button" value="{"Install" if not existing else "Installed"}" {"disabled=disabled" if existing else ""} class="gr-button gr-button-lg gr-button-secondary">"""

        tags_text = ", ".join([f"<span class='extension-tag' title='{tags.get(x, '')}'>{x}</span>" for x in extension_tags])

        code += f"""
            <tr>
                <td><a href="{html.escape(url)}" target="_blank">{html.escape(name)}</a><br />{tags_text}</td>
                <td>{html.escape(description)}</td>
                <td>{install_code}</td>
            </tr>
        
        """

        for tag in [x for x in extension_tags if x not in tags]:
            tags[tag] = tag

    code += """
        </tbody>
    </table>
    """

    if hidden > 0:
        code += f"<p>Extension hidden: {hidden}</p>"

    return code, list(tags)


def create_ui():
    import modules.ui

    with gr.Blocks(analytics_enabled=False) as ui:
        with gr.Tabs(elem_id="tabs_extensions") as tabs:
            with gr.TabItem("Installed"):

                with gr.Row():
                    apply = gr.Button(value="Apply and restart UI", variant="primary")
                    check = gr.Button(value="Check for updates")
                    extensions_disabled_list = gr.Text(elem_id="extensions_disabled_list", visible=False).style(container=False)
                    extensions_update_list = gr.Text(elem_id="extensions_update_list", visible=False).style(container=False)

                extensions_table = gr.HTML(lambda: extension_table())

                apply.click(
                    fn=apply_and_restart,
                    _js="extensions_apply",
                    inputs=[extensions_disabled_list, extensions_update_list],
                    outputs=[],
                )

                check.click(
                    fn=check_updates,
                    _js="extensions_check",
                    inputs=[],
                    outputs=[extensions_table],
                )

            with gr.TabItem("Available"):
                with gr.Row():
                    refresh_available_extensions_button = gr.Button(value="Load from:", variant="primary")
                    available_extensions_index = gr.Text(value="https://raw.githubusercontent.com/wiki/AUTOMATIC1111/stable-diffusion-webui/Extensions-index.md", label="Extension index URL").style(container=False)
                    extension_to_install = gr.Text(elem_id="extension_to_install", visible=False)
                    install_extension_button = gr.Button(elem_id="install_extension_button", visible=False)

                with gr.Row():
                    hide_tags = gr.CheckboxGroup(value=["ads", "localization", "installed"], label="Hide extensions with tags", choices=["script", "ads", "localization", "installed"])

                install_result = gr.HTML()
                available_extensions_table = gr.HTML()

                refresh_available_extensions_button.click(
                    fn=modules.ui.wrap_gradio_call(refresh_available_extensions, extra_outputs=[gr.update(), gr.update(), gr.update()]),
                    inputs=[available_extensions_index, hide_tags],
                    outputs=[available_extensions_index, available_extensions_table, hide_tags, install_result],
                )

                install_extension_button.click(
                    fn=modules.ui.wrap_gradio_call(install_extension_from_index, extra_outputs=[gr.update(), gr.update()]),
                    inputs=[extension_to_install, hide_tags],
                    outputs=[available_extensions_table, extensions_table, install_result],
                )

                hide_tags.change(
                    fn=modules.ui.wrap_gradio_call(refresh_available_extensions_for_tags, extra_outputs=[gr.update()]),
                    inputs=[hide_tags],
                    outputs=[available_extensions_table, install_result]
                )

            with gr.TabItem("Install from URL"):
                install_url = gr.Text(label="URL for extension's git repository")
                install_dirname = gr.Text(label="Local directory name", placeholder="Leave empty for auto")
                install_button = gr.Button(value="Install", variant="primary")
                install_result = gr.HTML(elem_id="extension_install_result")

                install_button.click(
                    fn=modules.ui.wrap_gradio_call(install_extension_from_url, extra_outputs=[gr.update()]),
                    inputs=[install_dirname, install_url],
                    outputs=[extensions_table, install_result],
                )

    return ui
