import asyncio
from typing import List, Optional
from models.image_prompt import ImagePrompt
from models.sql.image_asset import ImageAsset
from models.sql.slide import SlideModel
from services.icon_finder_service import ICON_FINDER_SERVICE
from services.image_generation_service import ImageGenerationService
from utils.dict_utils import get_dict_at_path, get_dict_paths_with_key, set_dict_at_path


async def process_slide_and_fetch_assets(
    image_generation_service: ImageGenerationService,
    slide: SlideModel,
    outline_image_urls: Optional[List[str]] = None,
) -> List[ImageAsset]:

    async_tasks = []
    async_task_meta = []

    image_paths = get_dict_paths_with_key(slide.content, "__image_prompt__")
    icon_paths = get_dict_paths_with_key(slide.content, "__icon_query__")

    for image_index, image_path in enumerate(image_paths):
        __image_prompt__parent = get_dict_at_path(slide.content, image_path)

        if (
            outline_image_urls
            and image_index < len(outline_image_urls)
            and outline_image_urls[image_index]
        ):
            __image_prompt__parent["__image_url__"] = outline_image_urls[image_index]
            set_dict_at_path(slide.content, image_path, __image_prompt__parent)
            continue

        async_tasks.append(
            image_generation_service.generate_image(
                ImagePrompt(
                    prompt=__image_prompt__parent["__image_prompt__"],
                )
            )
        )
        async_task_meta.append(("image", image_path))

    for icon_path in icon_paths:
        __icon_query__parent = get_dict_at_path(slide.content, icon_path)
        async_tasks.append(
            ICON_FINDER_SERVICE.search_icons(__icon_query__parent["__icon_query__"])
        )
        async_task_meta.append(("icon", icon_path))

    results = await asyncio.gather(*async_tasks) if async_tasks else []

    return_assets = []
    for (task_type, asset_path), result in zip(async_task_meta, results):
        if task_type == "image":
            image_dict = get_dict_at_path(slide.content, asset_path)
            if isinstance(result, ImageAsset):
                return_assets.append(result)
                image_dict["__image_url__"] = result.path
            else:
                image_dict["__image_url__"] = result
            set_dict_at_path(slide.content, asset_path, image_dict)
            continue

        icon_dict = get_dict_at_path(slide.content, asset_path)
        # ICON_FINDER_SERVICE.search_icons returns a list of URLs
        if isinstance(result, list) and result:
            icon_dict["__icon_url__"] = result[0]
        else:
            # Fallback to FastAPI static placeholder if no icon found
            icon_dict["__icon_url__"] = "/static/icons/placeholder.svg"
        set_dict_at_path(slide.content, asset_path, icon_dict)

    return return_assets


async def process_old_and_new_slides_and_fetch_assets(
    image_generation_service: ImageGenerationService,
    old_slide_content: dict,
    new_slide_content: dict,
) -> List[ImageAsset]:
    # Finds all old images
    old_image_dict_paths = get_dict_paths_with_key(
        old_slide_content, "__image_prompt__"
    )
    old_image_dicts = [
        get_dict_at_path(old_slide_content, path) for path in old_image_dict_paths
    ]
    old_image_prompts = [
        old_image_dict["__image_prompt__"] for old_image_dict in old_image_dicts
    ]

    # Finds all old icons
    old_icon_dict_paths = get_dict_paths_with_key(old_slide_content, "__icon_query__")
    old_icon_dicts = [
        get_dict_at_path(old_slide_content, path) for path in old_icon_dict_paths
    ]
    old_icon_queries = [
        old_icon_dict["__icon_query__"] for old_icon_dict in old_icon_dicts
    ]

    # Finds all new images
    new_image_dict_paths = get_dict_paths_with_key(
        new_slide_content, "__image_prompt__"
    )
    new_image_dicts = [
        get_dict_at_path(new_slide_content, path) for path in new_image_dict_paths
    ]

    # Finds all new icons
    new_icon_dict_paths = get_dict_paths_with_key(new_slide_content, "__icon_query__")
    new_icon_dicts = [
        get_dict_at_path(new_slide_content, path) for path in new_icon_dict_paths
    ]

    # Creates async tasks for fetching new images
    async_image_fetch_tasks = []
    new_images_fetch_status = []

    # Creates async tasks for fetching new icons
    async_icon_fetch_tasks = []
    new_icons_fetch_status = []

    # Creates async tasks for fetching new images
    # Use old image url if prompt is same
    for new_image in new_image_dicts:
        if new_image["__image_prompt__"] in old_image_prompts:
            old_image_url = old_image_dicts[
                old_image_prompts.index(new_image["__image_prompt__"])
            ]["__image_url__"]
            new_image["__image_url__"] = old_image_url
            new_images_fetch_status.append(False)
            continue

        async_image_fetch_tasks.append(
            image_generation_service.generate_image(
                ImagePrompt(
                    prompt=new_image["__image_prompt__"],
                )
            )
        )
        new_images_fetch_status.append(True)

    # Creates async tasks for fetching new icons
    # Use old icon url if query is same
    for new_icon in new_icon_dicts:
        if new_icon["__icon_query__"] in old_icon_queries:
            old_icon_url = old_icon_dicts[
                old_icon_queries.index(new_icon["__icon_query__"])
            ]["__icon_url__"]
            new_icon["__icon_url__"] = old_icon_url
            new_icons_fetch_status.append(False)
            continue

        async_icon_fetch_tasks.append(
            ICON_FINDER_SERVICE.search_icons(new_icon["__icon_query__"])
        )
        new_icons_fetch_status.append(True)

    new_images = await asyncio.gather(*async_image_fetch_tasks)
    new_icons = await asyncio.gather(*async_icon_fetch_tasks)

    # list of new assets
    new_assets = []

    # Sets new image and icon urls for assets that were fetched
    for i, _ in enumerate(new_images):
        if new_images_fetch_status[i]:
            fetched_image = new_images[i]
            if isinstance(fetched_image, ImageAsset):
                new_assets.append(fetched_image)
                image_url = fetched_image.path
            else:
                image_url = fetched_image
            new_image_dicts[i]["__image_url__"] = image_url

    for i, _ in enumerate(new_icons):
        if new_icons_fetch_status[i]:
            icon_result = new_icons[i]
            if icon_result and len(icon_result) > 0:
                new_icon_dicts[i]["__icon_url__"] = icon_result[0]
            else:
                # Fallback to placeholder if no icon found
                new_icon_dicts[i]["__icon_url__"] = "/static/icons/placeholder.svg"

    for i, new_image_dict in enumerate(new_image_dicts):
        set_dict_at_path(new_slide_content, new_image_dict_paths[i], new_image_dict)

    for i, new_icon_dict in enumerate(new_icon_dicts):
        set_dict_at_path(new_slide_content, new_icon_dict_paths[i], new_icon_dict)

    return new_assets


def process_slide_add_placeholder_assets(slide: SlideModel):

    image_paths = get_dict_paths_with_key(slide.content, "__image_prompt__")
    icon_paths = get_dict_paths_with_key(slide.content, "__icon_query__")

    for image_path in image_paths:
        image_dict = get_dict_at_path(slide.content, image_path)
        # Use FastAPI static path for placeholder image
        image_dict["__image_url__"] = "/static/images/placeholder.jpg"
        set_dict_at_path(slide.content, image_path, image_dict)

    for icon_path in icon_paths:
        icon_dict = get_dict_at_path(slide.content, icon_path)
        # Use FastAPI static path for placeholder icon
        icon_dict["__icon_url__"] = "/static/icons/placeholder.svg"
        set_dict_at_path(slide.content, icon_path, icon_dict)