#!/usr/bin/env python
# Copyright (c) 2022 Lincoln D. Stein (https://github.com/lstein)
# Before running stable-diffusion on an internet-isolated machine,
# run this script from one with internet connectivity. The
# two machines must share a common .cache directory.

"""
This is the npyscreen frontend to the model installation application.
It is currently named model_install2.py, but will ultimately replace model_install.py.
"""

import argparse
import curses
import pathlib
import sys
import traceback
import warnings
from argparse import Namespace
from shutil import get_terminal_size
from typing import Any, Dict, List, Optional, Set

import npyscreen
import torch
from npyscreen import widget

from invokeai.app.services.config.config_default import get_config
from invokeai.app.services.model_install import ModelInstallServiceBase
from invokeai.backend.install.check_directories import validate_directories
from invokeai.backend.install.install_helper import InstallHelper, InstallSelections, UnifiedModelInfo
from invokeai.backend.model_manager import ModelType
from invokeai.backend.util import choose_precision, choose_torch_device
from invokeai.backend.util.logging import InvokeAILogger
from invokeai.frontend.install.widgets import (
    MIN_COLS,
    MIN_LINES,
    CenteredTitleText,
    CyclingForm,
    MultiSelectColumns,
    SingleSelectColumns,
    TextBox,
    WindowTooSmallException,
    set_min_terminal_size,
)

warnings.filterwarnings("ignore", category=UserWarning)  # noqa: E402
config = get_config()
logger = InvokeAILogger.get_logger("ModelInstallService", config=config)
# logger.setLevel("WARNING")
# logger.setLevel('DEBUG')

# build a table mapping all non-printable characters to None
# for stripping control characters
# from https://stackoverflow.com/questions/92438/stripping-non-printable-characters-from-a-string-in-python
NOPRINT_TRANS_TABLE = {i: None for i in range(0, sys.maxunicode + 1) if not chr(i).isprintable()}

# maximum number of installed models we can display before overflowing vertically
MAX_OTHER_MODELS = 72


def make_printable(s: str) -> str:
    """Replace non-printable characters in a string."""
    return s.translate(NOPRINT_TRANS_TABLE)


class addModelsForm(CyclingForm, npyscreen.FormMultiPage):
    """Main form for interactive TUI."""

    # for responsive resizing set to False, but this seems to cause a crash!
    FIX_MINIMUM_SIZE_WHEN_CREATED = True

    # for persistence
    current_tab = 0

    def __init__(self, parentApp: npyscreen.NPSAppManaged, name: str, multipage: bool = False, **keywords: Any):
        self.multipage = multipage
        self.subprocess = None
        super().__init__(parentApp=parentApp, name=name, **keywords)

    def create(self) -> None:
        self.installer = self.parentApp.install_helper.installer
        self.model_labels = self._get_model_labels()
        self.keypress_timeout = 10
        self.counter = 0
        self.subprocess_connection = None

        window_width, window_height = get_terminal_size()

        # npyscreen has no typing hints
        self.nextrely -= 1  # type: ignore
        self.add_widget_intelligent(
            npyscreen.FixedText,
            value="Use ctrl-N and ctrl-P to move to the <N>ext and <P>revious fields. Cursor keys navigate, and <space> selects.",
            editable=False,
            color="CAUTION",
        )
        self.nextrely += 1  # type: ignore
        self.tabs = self.add_widget_intelligent(
            SingleSelectColumns,
            values=[
                "STARTERS",
                "MAINS",
                "CONTROLNETS",
                "T2I-ADAPTERS",
                "IP-ADAPTERS",
                "LORAS",
                "TI EMBEDDINGS",
            ],
            value=[self.current_tab],
            columns=7,
            max_height=2,
            relx=8,
            scroll_exit=True,
        )
        self.tabs.on_changed = self._toggle_tables

        top_of_table = self.nextrely  # type: ignore
        self.starter_pipelines = self.add_starter_pipelines()
        bottom_of_table = self.nextrely  # type: ignore

        self.nextrely = top_of_table
        self.pipeline_models = self.add_pipeline_widgets(
            model_type=ModelType.Main, window_width=window_width, exclude=self.starter_models
        )
        # self.pipeline_models['autoload_pending'] = True
        bottom_of_table = max(bottom_of_table, self.nextrely)

        self.nextrely = top_of_table
        self.controlnet_models = self.add_model_widgets(
            model_type=ModelType.ControlNet,
            window_width=window_width,
        )
        bottom_of_table = max(bottom_of_table, self.nextrely)

        self.nextrely = top_of_table
        self.t2i_models = self.add_model_widgets(
            model_type=ModelType.T2IAdapter,
            window_width=window_width,
        )
        bottom_of_table = max(bottom_of_table, self.nextrely)
        self.nextrely = top_of_table
        self.ipadapter_models = self.add_model_widgets(
            model_type=ModelType.IPAdapter,
            window_width=window_width,
        )
        bottom_of_table = max(bottom_of_table, self.nextrely)

        self.nextrely = top_of_table
        self.lora_models = self.add_model_widgets(
            model_type=ModelType.LoRA,
            window_width=window_width,
        )
        bottom_of_table = max(bottom_of_table, self.nextrely)

        self.nextrely = top_of_table
        self.ti_models = self.add_model_widgets(
            model_type=ModelType.TextualInversion,
            window_width=window_width,
        )
        bottom_of_table = max(bottom_of_table, self.nextrely)

        self.nextrely = bottom_of_table + 1

        self.nextrely += 1
        back_label = "BACK"
        cancel_label = "CANCEL"
        current_position = self.nextrely
        if self.multipage:
            self.back_button = self.add_widget_intelligent(
                npyscreen.ButtonPress,
                name=back_label,
                when_pressed_function=self.on_back,
            )
        else:
            self.nextrely = current_position
            self.cancel_button = self.add_widget_intelligent(
                npyscreen.ButtonPress, name=cancel_label, when_pressed_function=self.on_cancel
            )
            self.nextrely = current_position

        label = "APPLY CHANGES"
        self.nextrely = current_position
        self.done = self.add_widget_intelligent(
            npyscreen.ButtonPress,
            name=label,
            relx=window_width - len(label) - 15,
            when_pressed_function=self.on_done,
        )

        # This restores the selected page on return from an installation
        for _i in range(1, self.current_tab + 1):
            self.tabs.h_cursor_line_down(1)
        self._toggle_tables([self.current_tab])

    ############# diffusers tab ##########
    def add_starter_pipelines(self) -> dict[str, npyscreen.widget]:
        """Add widgets responsible for selecting diffusers models"""
        widgets: Dict[str, npyscreen.widget] = {}

        all_models = self.all_models  # master dict of all models, indexed by key
        model_list = [x for x in self.starter_models if all_models[x].type in ["main", "vae"]]
        model_labels = [self.model_labels[x] for x in model_list]

        widgets.update(
            label1=self.add_widget_intelligent(
                CenteredTitleText,
                name="Select from a starter set of Stable Diffusion models from HuggingFace and Civitae.",
                editable=False,
                labelColor="CAUTION",
            )
        )

        self.nextrely -= 1
        # if user has already installed some initial models, then don't patronize them
        # by showing more recommendations
        show_recommended = len(self.installed_models) == 0

        checked = [
            model_list.index(x)
            for x in model_list
            if (show_recommended and all_models[x].recommended) or all_models[x].installed
        ]
        widgets.update(
            models_selected=self.add_widget_intelligent(
                MultiSelectColumns,
                columns=1,
                name="Install Starter Models",
                values=model_labels,
                value=checked,
                max_height=len(model_list) + 1,
                relx=4,
                scroll_exit=True,
            ),
            models=model_list,
        )

        self.nextrely += 1
        return widgets

    ############# Add a set of model install widgets ########
    def add_model_widgets(
        self,
        model_type: ModelType,
        window_width: int = 120,
        install_prompt: Optional[str] = None,
        exclude: Optional[Set[str]] = None,
    ) -> dict[str, npyscreen.widget]:
        """Generic code to create model selection widgets"""
        if exclude is None:
            exclude = set()
        widgets: Dict[str, npyscreen.widget] = {}
        all_models = self.all_models
        model_list = sorted(
            [x for x in all_models if all_models[x].type == model_type and x not in exclude],
            key=lambda x: all_models[x].name or "",
        )
        model_labels = [self.model_labels[x] for x in model_list]

        show_recommended = len(self.installed_models) == 0
        truncated = False
        if len(model_list) > 0:
            max_width = max([len(x) for x in model_labels])
            columns = window_width // (max_width + 8)  # 8 characters for "[x] " and padding
            columns = min(len(model_list), columns) or 1
            prompt = (
                install_prompt
                or f"Select the desired {model_type.value.title()} models to install. Unchecked models will be purged from disk."
            )

            widgets.update(
                label1=self.add_widget_intelligent(
                    CenteredTitleText,
                    name=prompt,
                    editable=False,
                    labelColor="CAUTION",
                )
            )

            if len(model_labels) > MAX_OTHER_MODELS:
                model_labels = model_labels[0:MAX_OTHER_MODELS]
                truncated = True

            widgets.update(
                models_selected=self.add_widget_intelligent(
                    MultiSelectColumns,
                    columns=columns,
                    name=f"Install {model_type} Models",
                    values=model_labels,
                    value=[
                        model_list.index(x)
                        for x in model_list
                        if (show_recommended and all_models[x].recommended) or all_models[x].installed
                    ],
                    max_height=len(model_list) // columns + 1,
                    relx=4,
                    scroll_exit=True,
                ),
                models=model_list,
            )

        if truncated:
            widgets.update(
                warning_message=self.add_widget_intelligent(
                    npyscreen.FixedText,
                    value=f"Too many models to display (max={MAX_OTHER_MODELS}). Some are not displayed.",
                    editable=False,
                    color="CAUTION",
                )
            )

        self.nextrely += 1
        widgets.update(
            download_ids=self.add_widget_intelligent(
                TextBox,
                name="Additional URLs, or HuggingFace repo_ids to install (Space separated. Use shift-control-V to paste):",
                max_height=6,
                scroll_exit=True,
                editable=True,
            )
        )
        return widgets

    ### Tab for arbitrary diffusers widgets ###
    def add_pipeline_widgets(
        self,
        model_type: ModelType = ModelType.Main,
        window_width: int = 120,
        **kwargs,
    ) -> dict[str, npyscreen.widget]:
        """Similar to add_model_widgets() but adds some additional widgets at the bottom
        to support the autoload directory"""
        widgets = self.add_model_widgets(
            model_type=model_type,
            window_width=window_width,
            install_prompt=f"Installed {model_type.value.title()} models. Unchecked models in the InvokeAI root directory will be deleted. Enter URLs, paths or repo_ids to import.",
            **kwargs,
        )

        return widgets

    def resize(self) -> None:
        super().resize()
        if s := self.starter_pipelines.get("models_selected"):
            if model_list := self.starter_pipelines.get("models"):
                s.values = [self.model_labels[x] for x in model_list]

    def _toggle_tables(self, value: List[int]) -> None:
        selected_tab = value[0]
        widgets = [
            self.starter_pipelines,
            self.pipeline_models,
            self.controlnet_models,
            self.t2i_models,
            self.ipadapter_models,
            self.lora_models,
            self.ti_models,
        ]

        for group in widgets:
            for _k, v in group.items():
                try:
                    v.hidden = True
                    v.editable = False
                except Exception:
                    pass
        for _k, v in widgets[selected_tab].items():
            try:
                v.hidden = False
                if not isinstance(v, (npyscreen.FixedText, npyscreen.TitleFixedText, CenteredTitleText)):
                    v.editable = True
            except Exception:
                pass
        self.__class__.current_tab = selected_tab  # for persistence
        self.display()

    def _get_model_labels(self) -> dict[str, str]:
        """Return a list of trimmed labels for all models."""
        window_width, window_height = get_terminal_size()
        checkbox_width = 4
        spacing_width = 2
        result = {}

        models = self.all_models
        label_width = max([len(models[x].name or "") for x in self.starter_models])
        description_width = window_width - label_width - checkbox_width - spacing_width

        for key in self.all_models:
            description = models[key].description
            description = (
                description[0 : description_width - 3] + "..."
                if description and len(description) > description_width
                else description
                if description
                else ""
            )
            result[key] = f"%-{label_width}s %s" % (models[key].name, description)

        return result

    def _get_columns(self) -> int:
        window_width, window_height = get_terminal_size()
        cols = 4 if window_width > 240 else 3 if window_width > 160 else 2 if window_width > 80 else 1
        return min(cols, len(self.installed_models))

    def confirm_deletions(self, selections: InstallSelections) -> bool:
        remove_models = selections.remove_models
        if remove_models:
            model_names = [self.all_models[x].name or "" for x in remove_models]
            mods = "\n".join(model_names)
            is_ok = npyscreen.notify_ok_cancel(
                f"These unchecked models will be deleted from disk. Continue?\n---------\n{mods}"
            )
            assert isinstance(is_ok, bool)  # npyscreen doesn't have return type annotations
            return is_ok
        else:
            return True

    @property
    def all_models(self) -> Dict[str, UnifiedModelInfo]:
        # npyscreen doesn't having typing hints
        return self.parentApp.install_helper.all_models  # type: ignore

    @property
    def starter_models(self) -> List[str]:
        return self.parentApp.install_helper._starter_models  # type: ignore

    @property
    def installed_models(self) -> List[str]:
        return self.parentApp.install_helper._installed_models  # type: ignore

    def on_back(self) -> None:
        self.parentApp.switchFormPrevious()
        self.editing = False

    def on_cancel(self) -> None:
        self.parentApp.setNextForm(None)
        self.parentApp.user_cancelled = True
        self.editing = False

    def on_done(self) -> None:
        self.marshall_arguments()
        if not self.confirm_deletions(self.parentApp.install_selections):
            return
        self.parentApp.setNextForm(None)
        self.parentApp.user_cancelled = False
        self.editing = False

    def marshall_arguments(self) -> None:
        """
        Assemble arguments and store as attributes of the application:
        .starter_models: dict of model names to install from INITIAL_CONFIGURE.yaml
                         True  => Install
                         False => Remove
        .scan_directory: Path to a directory of models to scan and import
        .autoscan_on_startup:  True if invokeai should scan and import at startup time
        .import_model_paths:   list of URLs, repo_ids and file paths to import
        """
        selections = self.parentApp.install_selections
        all_models = self.all_models

        # Defined models (in INITIAL_CONFIG.yaml or invokeai.db) to add/remove
        ui_sections = [
            self.starter_pipelines,
            self.pipeline_models,
            self.controlnet_models,
            self.t2i_models,
            self.ipadapter_models,
            self.lora_models,
            self.ti_models,
        ]
        for section in ui_sections:
            if "models_selected" not in section:
                continue
            selected = {section["models"][x] for x in section["models_selected"].value}
            models_to_install = [x for x in selected if not self.all_models[x].installed]
            models_to_remove = [x for x in section["models"] if x not in selected and self.all_models[x].installed]
            selections.remove_models.extend(models_to_remove)
            selections.install_models.extend([all_models[x] for x in models_to_install])

        # models located in the 'download_ids" section
        for section in ui_sections:
            if downloads := section.get("download_ids"):
                models = [UnifiedModelInfo(source=x) for x in downloads.value.split()]
                selections.install_models.extend(models)


class AddModelApplication(npyscreen.NPSAppManaged):  # type: ignore
    def __init__(self, opt: Namespace, install_helper: InstallHelper):
        super().__init__()
        self.program_opts = opt
        self.user_cancelled = False
        self.install_selections = InstallSelections()
        self.install_helper = install_helper

    def onStart(self) -> None:
        npyscreen.setTheme(npyscreen.Themes.DefaultTheme)
        self.main_form = self.addForm(
            "MAIN",
            addModelsForm,
            name="Install Stable Diffusion Models",
            cycle_widgets=False,
        )


def list_models(installer: ModelInstallServiceBase, model_type: ModelType):
    """Print out all models of type model_type."""
    models = installer.record_store.search_by_attr(model_type=model_type)
    print(f"Installed models of type `{model_type}`:")
    for model in models:
        path = (config.models_path / model.path).resolve()
        print(f"{model.name:40}{model.base.value:5}{model.type.value:8}{model.format.value:12}{path}")


# --------------------------------------------------------
def select_and_download_models(opt: Namespace) -> None:
    """Prompt user for install/delete selections and execute."""
    precision = "float32" if opt.full_precision else choose_precision(torch.device(choose_torch_device()))
    config.precision = precision
    install_helper = InstallHelper(config, logger)
    installer = install_helper.installer

    if opt.list_models:
        list_models(installer, opt.list_models)

    elif opt.add or opt.delete:
        selections = InstallSelections(
            install_models=[UnifiedModelInfo(source=x) for x in (opt.add or [])], remove_models=opt.delete or []
        )
        install_helper.add_or_delete(selections)

    elif opt.default_only:
        default_model = install_helper.default_model()
        assert default_model is not None
        selections = InstallSelections(install_models=[default_model])
        install_helper.add_or_delete(selections)

    elif opt.yes_to_all:
        selections = InstallSelections(install_models=install_helper.recommended_models())
        install_helper.add_or_delete(selections)

    # this is where the TUI is called
    else:
        if not set_min_terminal_size(MIN_COLS, MIN_LINES):
            raise WindowTooSmallException(
                "Could not increase terminal size. Try running again with a larger window or smaller font size."
            )

        installApp = AddModelApplication(opt, install_helper)
        try:
            installApp.run()
        except KeyboardInterrupt:
            print("Aborted...")
            sys.exit(-1)

        install_helper.add_or_delete(installApp.install_selections)


# -------------------------------------
def main() -> None:
    parser = argparse.ArgumentParser(description="InvokeAI model downloader")
    parser.add_argument(
        "--add",
        nargs="*",
        help="List of URLs, local paths or repo_ids of models to install",
    )
    parser.add_argument(
        "--delete",
        nargs="*",
        help="List of names of models to delete. Use type:name to disambiguate, as in `controlnet:my_model`",
    )
    parser.add_argument(
        "--full-precision",
        dest="full_precision",
        action=argparse.BooleanOptionalAction,
        type=bool,
        default=False,
        help="use 32-bit weights instead of faster 16-bit weights",
    )
    parser.add_argument(
        "--yes",
        "-y",
        dest="yes_to_all",
        action="store_true",
        help='answer "yes" to all prompts',
    )
    parser.add_argument(
        "--default_only",
        action="store_true",
        help="Only install the default model",
    )
    parser.add_argument(
        "--list-models",
        choices=[x.value for x in ModelType],
        help="list installed models",
    )
    parser.add_argument(
        "--root_dir",
        dest="root",
        type=pathlib.Path,
        default=None,
        help="path to root of install directory",
    )
    opt = parser.parse_args()

    invoke_args: dict[str, Any] = {}
    if opt.full_precision:
        invoke_args["precision"] = "float32"
    config.update_config(invoke_args)
    if opt.root:
        config.set_root(opt.root)

    logger = InvokeAILogger().get_logger(config=config)

    try:
        validate_directories(config)
    except AssertionError:
        logger.info("Your InvokeAI root directory is not set up. Calling invokeai-configure.")
        sys.argv = ["invokeai_configure", "--yes", "--skip-sd-weights"]
        from invokeai.frontend.install.invokeai_configure import invokeai_configure

        invokeai_configure()
        sys.exit(0)

    try:
        select_and_download_models(opt)
    except AssertionError as e:
        logger.error(e)
        sys.exit(-1)
    except KeyboardInterrupt:
        curses.nocbreak()
        curses.echo()
        curses.endwin()
        logger.info("Goodbye! Come back soon.")
    except WindowTooSmallException as e:
        logger.error(str(e))
    except widget.NotEnoughSpaceForWidget as e:
        if str(e).startswith("Height of 1 allocated"):
            logger.error("Insufficient vertical space for the interface. Please make your window taller and try again")
        input("Press any key to continue...")
    except Exception as e:
        if str(e).startswith("addwstr"):
            logger.error(
                "Insufficient horizontal space for the interface. Please make your window wider and try again."
            )
        else:
            print(f"An exception has occurred: {str(e)} Details:")
            print(traceback.format_exc(), file=sys.stderr)
        input("Press any key to continue...")


# -------------------------------------
if __name__ == "__main__":
    main()