"""
Reference audio player component using native Gradio components.

Provides the reference reciter audio player with multi-verse navigation.
Supports:
- Single verse: Just audio player
- 2+ verses: Audio player with navigation arrows
- 3+ verses: Audio player with arrows and slider

Uses native Gradio components (gr.Audio, gr.Slider, gr.Button) instead of
custom HTML/JavaScript for HF Spaces compatibility.
"""
from typing import Optional

import gradio as gr

from i8n import t


def create_reference_audio_components(initial_audio_path: str | None = None) -> dict:
    """
    Create native Gradio components for reference audio playback.

    Args:
        initial_audio_path: Optional path to initial audio file. Must be set during
            component creation (not after) to properly render the waveform.

    Returns a dict with all components needed for reference audio:
    - nav_row: Row containing navigation buttons and slider
    - prev_btn: Previous verse button
    - slider: Slider for verse navigation (embedded in nav row)
    - next_btn: Next verse button
    - audio_player: Native Gradio audio player with "Reference Reciter" label
    - verse_index: State tracking current index
    - verse_keys: State tracking list of verse keys

    Returns:
        Dict with component references
    """
    with gr.Column(elem_classes=["reference-audio-section"]):
        # Navigation row with slider (hidden for single verse)
        # Layout: [◀ 15%] [slider 70%] [▶ 15%]
        with gr.Row(visible=False, elem_classes=["ref-audio-nav-row"]) as nav_row:
            prev_btn = gr.Button(
                "◀",
                scale=1,
                min_width=40,
                elem_classes=["ref-audio-nav-btn"]
            )
            verse_slider = gr.Slider(
                minimum=0,
                maximum=0,
                step=1,
                value=0,
                label="",
                show_label=False,
                scale=5,
                elem_id="ref-audio-verse-slider",
                elem_classes=["ref-audio-slider"]
            )
            next_btn = gr.Button(
                "▶",
                scale=1,
                min_width=40,
                elem_classes=["ref-audio-nav-btn"]
            )

        # Audio player (always visible)
        audio_player = gr.Audio(
            value=initial_audio_path,
            label=t("audio.reference_reciter"),
            show_label=False,
            type="filepath",
            interactive=False,
            elem_classes=["ref-audio-player"]
        )

    # State components
    verse_index = gr.State(0)
    verse_keys = gr.State([])

    return {
        "nav_row": nav_row,
        "prev_btn": prev_btn,
        "slider": verse_slider,
        "next_btn": next_btn,
        "audio_player": audio_player,
        "verse_index": verse_index,
        "verse_keys": verse_keys,
    }


# ============================================================================
# Legacy functions (kept for backward compatibility during transition)
# ============================================================================

def get_placeholder_audio_html() -> str:
    """
    Return placeholder HTML to prevent empty-state Gradio bug.

    DEPRECATED: Use create_reference_audio_components() instead.
    Kept for backward compatibility.
    """
    return '<div id="ref-audio-container" style="display:none;"></div>'


def build_reference_audio_html(
    data_uris: list[str] | str | None = None,
    urls: list[str] | str | None = None,
    verse_keys: list[str] | None = None,
    from_verse: int | None = None,
    to_verse: int | None = None,
    chapter: int | None = None,
    label: str = "Reference Reciter",
    lazy_load: bool = False
) -> str:
    """
    Build HTML for audio player with multi-verse navigation.

    DEPRECATED: Use create_reference_audio_components() instead.
    Kept for backward compatibility during transition.
    """
    # Determine which source to use (prefer urls for lazy loading)
    sources = urls if urls is not None else data_uris

    # Handle backward compatibility: convert single string to list
    if isinstance(sources, str):
        if not sources:
            return ""
        sources = [sources]
        if from_verse is None:
            from_verse = 1
        if to_verse is None:
            to_verse = 1

    # In lazy_load mode, use verse_keys to determine verse count
    if lazy_load and verse_keys:
        verse_count = len(verse_keys)
    elif sources:
        verse_count = len(sources)
    else:
        return ""

    # Ensure we have at least one source for the first verse
    if not sources or len(sources) == 0:
        return ""

    # Determine verse range
    if from_verse is None or to_verse is None:
        from_verse = 1
        to_verse = verse_count

    # Determine what UI elements to show
    show_navigation = verse_count >= 2
    show_slider = verse_count >= 3
    show_indicator = verse_count >= 2

    # Serialize sources (URLs or data URIs) to JSON for JavaScript
    import json
    sources_json = json.dumps(sources)
    verse_keys_json = json.dumps(verse_keys) if verse_keys else "[]"

    # CSS styles
    container_style = '''
        position: relative;
        padding: 12px 14px;
        border: 1px solid var(--border-color-primary, #e5e7eb);
        border-radius: 10px;
        background: var(--background-fill-secondary, #f3f4f6);
    '''

    header_style = '''
        display: flex;
        justify-content: flex-start;
        align-items: center;
        margin-bottom: 8px;
    '''

    title_style = '''
        font-weight: 600;
        font-size: 14px;
        color: var(--body-text-color, inherit);
    '''

    verse_indicator_style = '''
        position: absolute;
        top: 8px;
        right: 14px;
        background: #fb8c00;
        color: white;
        padding: 4px 10px;
        border-radius: 6px;
        font-size: 12px;
        font-weight: 600;
    '''

    slider_row_style = '''
        margin-bottom: 10px;
        padding: 0 30px;
    '''

    slider_style = '''
        width: 100%;
        height: 6px;
        cursor: pointer;
        accent-color: #fb8c00;
    '''

    player_row_style = '''
        display: flex;
        align-items: center;
        gap: 12px;
    '''

    nav_button_style = '''
        background: var(--button-secondary-background-fill, #f3f4f6);
        border: 1px solid var(--border-color-primary, #e5e7eb);
        border-radius: 6px;
        padding: 8px 12px;
        cursor: pointer;
        font-size: 16px;
        font-weight: 600;
        transition: background 0.2s;
        color: var(--body-text-color, inherit);
    '''

    audio_style = '''
        flex: 1;
        height: 36px;
        min-width: 0;
    '''

    # Build final HTML
    html = f'''
    <div id="ref-audio-container"
         style="{container_style}"
         data-verse-count="{verse_count}"
         data-current-verse="0"
         data-uris='{sources_json}'
         data-verse-keys='{verse_keys_json}'
         data-from-verse="{from_verse}"
         data-chapter="{chapter or 1}"
         data-lazy-load="{str(lazy_load).lower()}">

        <div style="{header_style}">
            <span style="{title_style}">{label}</span>
        </div>

        {'<div style="' + verse_indicator_style + '" id="verse-indicator">Verse ' + str(from_verse) + '</div>' if show_indicator else ''}

        {'<div style="' + slider_row_style + '"><input type="range" id="verse-slider" min="0" max="' + str(verse_count - 1) + '" value="0" style="' + slider_style + '"></div>' if show_slider else ''}

        <div style="{player_row_style}">
            {'<button class="ref-audio-nav-btn" data-direction="-1" style="' + nav_button_style + '">◀</button>' if show_navigation else ''}
            <audio id="ref-audio-player" controls style="{audio_style}">
                <source src="{sources[0]}" type="audio/mpeg">
                Your browser does not support the audio element.
            </audio>
            {'<button class="ref-audio-nav-btn" data-direction="1" style="' + nav_button_style + '">▶</button>' if show_navigation else ''}
        </div>
    </div>
    '''

    return html


def create_reference_audio_section(init_audio_html: str) -> dict:
    """
    Create reference audio section with just the audio player.

    DEPRECATED: Use create_reference_audio_components() instead.
    Kept for backward compatibility during transition.
    """
    # Main audio player row
    with gr.Row(equal_height=True) as audio_row:
        with gr.Column(scale=1, min_width=80, visible=False) as dropdown_col:
            dropdown = gr.Dropdown(visible=False)
        with gr.Column(scale=4) as audio_col:
            audio_html = gr.HTML(
                value=init_audio_html,
                elem_id="reference-audio-container"
            )

    return {
        "audio_row": audio_row,
        "audio_html": audio_html,
        "dropdown_col": dropdown_col,
        "dropdown": dropdown,
    }