"""History gallery tab component."""

import logging
from pathlib import Path
from typing import Optional

import gradio as gr

from src.storage.history import history_manager, HistoryItem

logger = logging.getLogger(__name__)


def get_history_gallery(type_filter: str = "All") -> list[tuple[str, str]]:
    """Get history items for gallery display."""
    items = history_manager.get_recent(limit=100)

    gallery_items = []
    for item in items:
        # Apply type filter
        if type_filter == "Images" and item.type != "image":
            continue
        if type_filter == "Videos" and item.type != "video":
            continue

        output_path = Path(item.output_path)
        if not output_path.exists():
            continue

        # For images, show the image directly
        if item.type == "image":
            caption = f"{item.output_filename}\n{item.output_width}x{item.output_height}"
            gallery_items.append((str(output_path), caption))
        # For videos, show output path (Gradio Gallery will handle video thumbnails)
        elif item.type == "video":
            caption = f"🎬 {item.output_filename}\n{item.output_width}x{item.output_height}"
            gallery_items.append((str(output_path), caption))

    return gallery_items


def get_history_stats() -> str:
    """Get history statistics."""
    stats = history_manager.get_statistics()

    return (
        f"**History Statistics**\n\n"
        f"- Total Items: {stats['total_items']}\n"
        f"- Images: {stats['images']}\n"
        f"- Videos: {stats['videos']}\n"
        f"- Total Processing Time: {stats['total_processing_time']/60:.1f} min\n"
        f"- Total Input Size: {stats['total_input_size_mb']:.1f} MB\n"
        f"- Total Output Size: {stats['total_output_size_mb']:.1f} MB"
    )


def search_history(query: str, type_filter: str = "All") -> list[tuple[str, str]]:
    """Search history by filename."""
    if not query:
        return get_history_gallery(type_filter)

    items = history_manager.search(query)

    gallery_items = []
    for item in items:
        # Apply type filter
        if type_filter == "Images" and item.type != "image":
            continue
        if type_filter == "Videos" and item.type != "video":
            continue

        output_path = Path(item.output_path)
        if not output_path.exists():
            continue

        if item.type == "image":
            caption = f"{item.output_filename}\n{item.output_width}x{item.output_height}"
            gallery_items.append((str(output_path), caption))
        elif item.type == "video":
            caption = f"🎬 {item.output_filename}\n{item.output_width}x{item.output_height}"
            gallery_items.append((str(output_path), caption))

    return gallery_items


def get_item_details(evt: gr.SelectData, type_filter: str = "All") -> tuple[Optional[tuple], str]:
    """Get details for selected history item."""
    if evt.index is None:
        return None, "Select an item to view details"

    items = history_manager.get_recent(limit=100)

    # Filter items same as gallery
    filtered_items = []
    for item in items:
        if type_filter == "Images" and item.type != "image":
            continue
        if type_filter == "Videos" and item.type != "video":
            continue
        if Path(item.output_path).exists():
            filtered_items.append(item)

    if evt.index >= len(filtered_items):
        return None, "Item not found"

    item = filtered_items[evt.index]

    # Load images for slider (only for images)
    slider_images = None
    if item.type == "image":
        input_path = Path(item.input_path)
        output_path = Path(item.output_path)
        if input_path.exists() and output_path.exists():
            slider_images = (str(input_path), str(output_path))

    # Format details
    details = f"**{item.output_filename}**\n\n"
    details += f"- **Type:** {item.type.title()}\n"
    details += f"- **Model:** {item.model}\n"
    details += f"- **Scale:** {item.scale}x\n"
    details += f"- **Face Enhancement:** {'Yes' if item.face_enhance else 'No'}\n"

    if item.type == "video" and item.video_codec:
        details += f"- **Codec:** {item.video_codec}\n"
        if item.frames_count:
            details += f"- **Frames:** {item.frames_count}\n"

    details += f"- **Input:** {item.input_width}x{item.input_height}\n"
    details += f"- **Output:** {item.output_width}x{item.output_height}\n"
    details += f"- **Processing Time:** {item.processing_time_seconds:.1f}s\n"
    details += f"- **Input Size:** {item.input_size_bytes/1024:.1f} KB\n"
    details += f"- **Output Size:** {item.output_size_bytes/1024/1024:.1f} MB\n" if item.output_size_bytes > 1024*1024 else f"- **Output Size:** {item.output_size_bytes/1024:.1f} KB\n"
    details += f"- **Created:** {item.created_at.strftime('%Y-%m-%d %H:%M')}"

    return slider_images, details


def delete_selected(evt: gr.SelectData, type_filter: str = "All") -> tuple[list, str]:
    """Delete selected history item."""
    if evt.index is None:
        return get_history_gallery(type_filter), "No item selected"

    items = history_manager.get_recent(limit=100)

    # Filter items same as gallery
    filtered_items = []
    for item in items:
        if type_filter == "Images" and item.type != "image":
            continue
        if type_filter == "Videos" and item.type != "video":
            continue
        if Path(item.output_path).exists():
            filtered_items.append(item)

    if evt.index >= len(filtered_items):
        return get_history_gallery(type_filter), "Item not found"

    item = filtered_items[evt.index]
    history_manager.delete_item(item.id)

    return get_history_gallery(type_filter), f"Deleted: {item.output_filename}"


def create_history_tab():
    """Create the history gallery tab component."""
    with gr.Tab("History", id="history-tab"):
        gr.Markdown("## Processing History")

        with gr.Row():
            # Search
            search_box = gr.Textbox(
                label="Search",
                placeholder="Search by filename...",
                scale=3,
            )

            filter_dropdown = gr.Dropdown(
                choices=["All", "Images", "Videos"],
                value="All",
                label="Filter",
                scale=1,
            )

            refresh_btn = gr.Button("Refresh", variant="secondary", scale=1)

        with gr.Row():
            # Gallery
            with gr.Column(scale=2):
                gallery = gr.Gallery(
                    value=get_history_gallery(),
                    label="History",
                    columns=4,
                    object_fit="cover",
                    height=400,
                    allow_preview=True,
                )

            # Details panel
            with gr.Column(scale=1):
                stats_display = gr.Markdown(
                    get_history_stats(),
                    elem_classes=["info-card"],
                )

        # Selected item details
        with gr.Row():
            with gr.Column(scale=2):
                try:
                    from gradio_imageslider import ImageSlider

                    comparison_slider = ImageSlider(
                        label="Before / After",
                        type="filepath",
                    )
                except ImportError:
                    comparison_slider = gr.Image(
                        label="Selected Image",
                        type="filepath",
                    )

            with gr.Column(scale=1):
                item_details = gr.Markdown(
                    "Select an item to view details",
                    elem_classes=["info-card"],
                )

                with gr.Row():
                    download_btn = gr.Button("Download", variant="secondary")
                    delete_btn = gr.Button("Delete", variant="stop")

        status_text = gr.Markdown("")

        # Event handlers
        search_box.change(
            fn=search_history,
            inputs=[search_box, filter_dropdown],
            outputs=[gallery],
        )

        filter_dropdown.change(
            fn=get_history_gallery,
            inputs=[filter_dropdown],
            outputs=[gallery],
        )

        gallery.select(
            fn=get_item_details,
            inputs=[filter_dropdown],
            outputs=[comparison_slider, item_details],
        )

        delete_btn.click(
            fn=lambda f: (get_history_gallery(f), get_history_stats()),
            inputs=[filter_dropdown],
            outputs=[gallery, stats_display],
        )

        refresh_btn.click(
            fn=lambda f: (get_history_gallery(f), get_history_stats()),
            inputs=[filter_dropdown],
            outputs=[gallery, stats_display],
        )

    return {
        "gallery": gallery,
        "comparison_slider": comparison_slider,
        "item_details": item_details,
        "stats_display": stats_display,
        "filter_dropdown": filter_dropdown,
        "refresh_btn": refresh_btn,
    }