# FILE: ui_layout.py
import gradio as gr

# --- UI Constants and Configuration ---
TTS_MODELS_AVAILABLE = ["tts-1", "tts-1-hd", "gpt-4o-mini-tts"]
MODEL_DEFAULT_ENV = "tts-1-hd"

SPEAKER_CONFIG_METHODS = [
    "Single Voice (Global)",
    "Random per Speaker",
    "A/B Round Robin",
    "Detailed Configuration (Per Speaker UI)"
]
DEFAULT_SPEAKER_CONFIG_METHOD = "Random per Speaker"

# Assuming utils.openai_tts.OPENAI_VOICES exists and provides a list of voice names
# If not, define APP_AVAILABLE_VOICES directly here for now.
try:
    from utils.openai_tts import OPENAI_VOICES as ALL_TTS_VOICES
    APP_AVAILABLE_VOICES = ALL_TTS_VOICES.copy()
    if not APP_AVAILABLE_VOICES: # Fallback if OPENAI_VOICES is empty
        APP_AVAILABLE_VOICES = ["alloy", "echo", "fable", "onyx", "nova", "shimmer"]
except ImportError:
    print("Warning: Could not import OPENAI_VOICES from utils.openai_tts. Using default list.")
    APP_AVAILABLE_VOICES = ["alloy", "echo", "fable", "onyx", "nova", "shimmer"]


PREDEFINED_VIBES = {
    "None": "", "Calm": "Speak in a calm, composed, and relaxed manner.",
    "Excited": "Speak with an energetic, enthusiastic, and lively tone.",
    "Happy": "Speak with a cheerful, bright, and joyful voice.",
    "Sad": "Speak with a sorrowful, melancholic, and dejected tone.",
    "Whisper": "Speak softly, as if whispering.",
    "Angry": "Speak with a strong, firm, and possibly agitated voice.",
    "Fearful": "Speak with a trembling, hesitant, and scared voice.",
    "Formal": "Speak in a clear, precise, and professional tone, suitable for a formal address.",
    "Authoritative": "Speak with a commanding, confident, and firm voice.",
    "Friendly": "Speak in a warm, approachable, and amiable manner.",
    "Custom...": "CUSTOM"
}
VIBE_CHOICES = list(PREDEFINED_VIBES.keys())
DEFAULT_VIBE = "None"
DEFAULT_GLOBAL_VOICE = APP_AVAILABLE_VOICES[0] if APP_AVAILABLE_VOICES else "alloy"


# --- UI Element Creation Functions ---

def create_main_input_components(model_default_value):
    """Creates the main input components for script, model, pause, and global settings."""
    with gr.Row(elem_id="main_input_row"):
        with gr.Column(scale=2, elem_id="script_input_column"):
            script_input = gr.TextArea(label="Dialogue Script", placeholder="[Speaker1] Hello world!\\n[Speaker2] How are you today?", lines=10, elem_id="script_input_area")
        with gr.Column(scale=1, elem_id="model_config_column"):
            tts_model_dropdown = gr.Dropdown(TTS_MODELS_AVAILABLE, label="TTS Model", value=model_default_value, elem_id="tts_model_dropdown")
            pause_input = gr.Number(label="Pause Between Lines (ms)", value=500, minimum=0, maximum=5000, step=50, elem_id="pause_input")
            
            is_tts1_family_default = model_default_value in ["tts-1", "tts-1-hd"]
            is_gpt_mini_tts_default = model_default_value == "gpt-4o-mini-tts"

            global_speed_input = gr.Slider(
                minimum=0.25, maximum=4.0, value=1.0, step=0.05,
                label="Global Speed (for tts-1/hd)",
                visible=is_tts1_family_default, interactive=True, elem_id="global_speed_input"
            )
            global_instructions_input = gr.Textbox(
                label="Global Instructions (for gpt-4o-mini-tts)",
                placeholder="e.g., Speak with a calm tone.",
                visible=is_gpt_mini_tts_default, interactive=True, lines=2, elem_id="global_instructions_input"
            )
    return script_input, tts_model_dropdown, pause_input, global_speed_input, global_instructions_input

def create_speaker_config_components():
    """Creates components for speaker configuration method selection and the container for detailed UI."""
    gr.Markdown("### Speaker Voice & Style Configuration")
    speaker_config_method_dropdown = gr.Dropdown(
        SPEAKER_CONFIG_METHODS, label="Configuration Method", value=DEFAULT_SPEAKER_CONFIG_METHOD,
        elem_id="speaker_config_method_dropdown"
    )

    with gr.Group(visible=(DEFAULT_SPEAKER_CONFIG_METHOD == "Single Voice (Global)"), elem_id="single_voice_config_group") as single_voice_group:
        global_voice_dropdown = gr.Dropdown(
            APP_AVAILABLE_VOICES, label="Global Voice", value=DEFAULT_GLOBAL_VOICE, interactive=True,
            elem_id="global_voice_dropdown"
        )

    detailed_per_speaker_ui_group_container = gr.Column(
        visible=(DEFAULT_SPEAKER_CONFIG_METHOD == "Detailed Configuration (Per Speaker UI)"),
        elem_id="detailed_per_speaker_ui_group_container" 
    )
    with detailed_per_speaker_ui_group_container:
        load_per_speaker_ui_button = gr.Button(
            "Load/Refresh Per-Speaker Settings UI (from Script Above)",
            elem_id="load_per_speaker_ui_button"
        )
        gr.Markdown(
            "<small>Click button above to populate settings for each speaker found in the script. "
            "Settings are applied per-speaker. If script changes, click again to refresh.</small>"
        )
        # The @gr.render dynamic UI will be placed here by app.py
    
    return (
        speaker_config_method_dropdown, 
        single_voice_group, 
        global_voice_dropdown, 
        detailed_per_speaker_ui_group_container,
        load_per_speaker_ui_button
    )

def create_action_and_output_components():
    """Creates buttons for actions (cost, generate) and output display areas."""
    with gr.Row(elem_id="action_buttons_row"):
        calculate_cost_button = gr.Button("Calculate Estimated Cost", elem_id="calculate_cost_button")
        generate_button = gr.Button("Generate Audio", variant="primary", elem_id="generate_button")
    
    cost_output = gr.Textbox(label="Estimated Cost", interactive=False, elem_id="cost_output")
    with gr.Row(elem_id="output_files_row"):
        individual_lines_zip_output = gr.File(label="Download Individual Lines (ZIP)", elem_id="individual_lines_zip_output")
        merged_dialogue_mp3_output = gr.Audio(label="Play/Download Merged Dialogue (MP3)", type="filepath", elem_id="merged_dialogue_mp3_output")
    status_output = gr.Textbox(label="Status", interactive=False, lines=2, max_lines=5, elem_id="status_output")
    return calculate_cost_button, generate_button, cost_output, individual_lines_zip_output, merged_dialogue_mp3_output, status_output

def create_examples_ui(inputs_for_examples, process_fn, outputs_for_examples=None):
    """Creates the examples section."""
    gr.Markdown("## Example Scripts")
    example_script_1 = "[Alice] Hello Bob, this is a test using the detailed configuration method.\\n[Bob] Hi Alice! I'm Bob, and I'll have my own voice settings.\\n[Alice] Let's see how this sounds."
    example_script_2 = "[Narrator] This is a short story.\\n[CharacterA] Once upon a time...\\n[Narrator] ...there was a Gradio app.\\n[CharacterB] And it could talk!"
    
    examples_data = [
        [example_script_1, "tts-1-hd", 300, "Detailed Configuration (Per Speaker UI)", DEFAULT_GLOBAL_VOICE, {}, 1.0, ""],
        [example_script_2, "gpt-4o-mini-tts", 200, "Random per Speaker", DEFAULT_GLOBAL_VOICE, {}, 1.0, "Speak with a gentle, storytelling voice for the narrator."],
        ["[Solo] Just one line, using global voice and speed.", "tts-1", 0, "Single Voice (Global)", "fable", {}, 1.2, ""],
    ]
    
    num_inputs = len(inputs_for_examples)
    valid_examples_data = []
    for ex_data in examples_data:
        if len(ex_data) == num_inputs:
            valid_examples_data.append(ex_data)
        else:
            print(f"Warning: Example data mismatch. Expected {num_inputs} items, got {len(ex_data)}. Skipping example: {ex_data[0][:30]}...")

    if not valid_examples_data:
        gr.Markdown("<p style='color: orange;'>No valid examples could be loaded due to configuration mismatch.</p>")
        return None

    if process_fn and outputs_for_examples:
        return gr.Examples(
            examples=valid_examples_data,
            inputs=inputs_for_examples,
            outputs=outputs_for_examples,
            fn=process_fn,
            cache_examples=False,
            examples_per_page=5,
            label="Example Scripts (Click to Load & Run)",
            run_on_click=True 
        )
    else: 
        return gr.Examples(
            examples=valid_examples_data,
            inputs=inputs_for_examples,
            examples_per_page=5,
            label="Example Scripts (Click to Load Inputs)",
        )