app.py

import gradio as gr
import whisper
import yt_dlp
import os
import tempfile

models = {}

def load_model(model_name):
    if model_name not in models:
        models[model_name] = whisper.load_model(model_name)
    return models[model_name]

def format_time(seconds):
    m = int(seconds // 60)
    s = int(seconds % 60)
    ms = int((seconds % 1) * 10)
    return f"{m:02d}:{s:02d}.{ms}"


# Simple Devanagari to Roman fallback map
DEVA_MAP = {
    'अ':'a','आ':'aa','इ':'i','ई':'ii','उ':'u','ऊ':'uu','ए':'e','ऐ':'ai',
    'ओ':'o','औ':'au','क':'k','ख':'kh','ग':'g','घ':'gh','च':'ch','छ':'chh',
    'ज':'j','झ':'jh','ट':'t','ड':'d','त':'t','थ':'th','द':'d','ध':'dh',
    'न':'n','प':'p','फ':'ph','ब':'b','भ':'bh','म':'m','य':'y','र':'r',
    'ल':'l','व':'v','श':'sh','ष':'sh','स':'s','ह':'h','ं':'n','ः':'h',
    'ा':'a','ि':'i','ी':'i','ु':'u','ू':'u','े':'e','ै':'ai','ो':'o',
    'ौ':'au','्':'','ळ':'l','क्ष':'ksh','ज्ञ':'gya','ड़':'r','ढ़':'rh',
    'ऑ':'o','ऍ':'e','ॉ':'o','।':'.','॥':'.','ऋ':'ri','ॠ':'ri',
    'ग़':'g','ज़':'z','फ़':'f','ड़':'r','ढ़':'rh','ञ':'n','ण':'n','ङ':'n',
}

def devanagari_to_roman(text):
    result = []
    for ch in text:
        result.append(DEVA_MAP.get(ch, ch))
    return ''.join(result)



custom_css = """
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@1&family=Geist:wght@300;400;500;600&display=swap');

*, *::before, *::after { box-sizing: border-box; }

body, .gradio-container {
    background: #0a0a0a !important;
    font-family: 'Geist', sans-serif !important;
    color: #ededed !important;
}

.gradio-container {
    max-width: 1080px !important;
    margin: 0 auto !important;
    padding: 0 !important;
}

/* NAV / Header */
.prose {
    padding: 0 40px !important;
    height: 56px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    border-bottom: 1px solid #1a1a1a !important;
    margin-bottom: 0 !important;
}

.prose h1 {
    font-family: 'Geist', sans-serif !important;
    font-size: 13px !important;
    font-weight: 600 !important;
    color: #ededed !important;
    letter-spacing: -0.02em !important;
    line-height: 1 !important;
    margin: 0 !important;
}

.prose h1 em {
    font-family: 'Instrument Serif', serif !important;
    font-style: italic !important;
    font-weight: 400 !important;
    color: #58B8FF !important;
    font-size: 14px !important;
}

.prose p {
    font-size: 10px !important;
    color: #2a2a2a !important;
    letter-spacing: 0.14em !important;
    margin: 0 !important;
}

/* Layout */
.contain, .gap { background: transparent !important; border: none !important; }

.block {
    background: #0f0f0f !important;
    border: 1px solid #1a1a1a !important;
    border-radius: 10px !important;
}

.block label > span, label > span {
    font-family: 'Geist', sans-serif !important;
    font-size: 10px !important;
    font-weight: 500 !important;
    color: #333 !important;
    text-transform: uppercase !important;
    letter-spacing: 0.16em !important;
}

/* File upload */
[data-testid="file"], .file {
    background: #0a0a0a !important;
    border: 1px dashed #1a2d3a !important;
    border-radius: 12px !important;
    min-height: 160px !important;
    transition: all 0.2s !important;
}

[data-testid="file"]:hover {
    border-color: #3066BE !important;
    background: #060d18 !important;
}

/* Dropdowns */
.wrap-inner, select {
    background: #0a0a0a !important;
    border: 1px solid #1a1a1a !important;
    border-radius: 8px !important;
    color: #ededed !important;
    font-family: 'Geist', sans-serif !important;
    font-size: 12px !important;
}

/* Radio */
input[type="radio"] { accent-color: #3066BE !important; }
input[type="checkbox"] { accent-color: #3066BE !important; }

/* Textarea */
textarea {
    background: transparent !important;
    color: #c8c8c8 !important;
    font-family: 'Geist', sans-serif !important;
    font-size: 14px !important;
    line-height: 1.9 !important;
    font-weight: 300 !important;
    border: none !important;
}

textarea::placeholder { color: #1a1a1a !important; font-style: italic !important; }

/* Primary button */
button.primary {
    background: #ededed !important;
    border: none !important;
    border-radius: 8px !important;
    color: #000 !important;
    font-family: 'Geist', sans-serif !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    letter-spacing: 0.04em !important;
    padding: 12px 28px !important;
    transition: all 0.18s ease !important;
    width: 100% !important;
}

button.primary:hover {
    background: #58B8FF !important;
    color: #000 !important;
}

/* Secondary button */
button.secondary {
    background: transparent !important;
    border: 1px solid #1a1a1a !important;
    border-radius: 8px !important;
    color: #333 !important;
    font-family: 'Geist', sans-serif !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    letter-spacing: 0.04em !important;
    padding: 12px 28px !important;
    transition: all 0.18s ease !important;
    width: 100% !important;
}

button.secondary:hover {
    border-color: #3066BE !important;
    color: #58B8FF !important;
}

/* Tabs */
.tab-nav { border-bottom: 1px solid #141414 !important; }

.tab-nav button {
    font-family: 'Geist', sans-serif !important;
    font-size: 11px !important;
    font-weight: 500 !important;
    letter-spacing: 0.12em !important;
    text-transform: uppercase !important;
    color: #333 !important;
    background: transparent !important;
    border: none !important;
    border-bottom: 1.5px solid transparent !important;
    padding: 12px 20px !important;
    transition: all 0.15s !important;
}

.tab-nav button.selected {
    color: #ededed !important;
    border-bottom-color: #3066BE !important;
}

/* Progress bar */
.progress-bar { background: #3066BE !important; }
.progress-bar-wrap { background: #111 !important; border-radius: 0 !important; }

/* Scrollbar */
::-webkit-scrollbar { width: 2px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #1a2030; }

footer { display: none !important; }
"""

LANGUAGES = [
    "Auto Detect", "English", "Hinglish (Roman)", "Hindi", "Spanish", "French",
    "German", "Italian", "Portuguese", "Chinese", "Japanese",
    "Korean", "Arabic", "Russian", "Dutch", "Turkish"
]

MODEL_INFO = {
    "tiny":   "Fastest — best for short clips",
    "base":   "Fast — good everyday accuracy",
    "small":  "Balanced — recommended",
    "medium": "Best accuracy — slower processing"
}

with gr.Blocks(title="Kalp Transcript — Kalpi Edition") as demo:

    gr.Markdown("""
# Kalp *Transcript*
by Kalpi Edition
""")

    with gr.Row():
        with gr.Column(scale=5):
            file_input = gr.File(
                label="Drop your file here — MP4 · MOV · MP3 · WAV · M4A"
            )
            with gr.Row():
                model_choice = gr.Dropdown(
                    choices=[
                        "tiny   — Fastest",
                        "base   — Fast",
                        "small  — Balanced",
                        "medium — Best accuracy",
                        "large-v3 — Most accurate (very slow)"
                    ],
                    value="tiny   — Fastest",
                    label="Model"
                )
                language = gr.Dropdown(
                    choices=LANGUAGES,
                    value="Auto Detect",
                    label="Language"
                )
            with gr.Row():
                translate = gr.Dropdown(
                    choices=["Off", "Translate to English"],
                    value="Off",
                    label="Translate"
                )
                timestamps = gr.Checkbox(
                    label="Show timestamps",
                    value=False
                )
            gr.Markdown("<div style='height:4px'></div>")
            submit_btn = gr.Button("Transcribe →", variant="primary")
            clear_btn = gr.ClearButton(value="Clear", variant="secondary")

        with gr.Column(scale=6):
            with gr.Tabs():
                with gr.Tab("Transcript"):
                    output = gr.Textbox(
                        label="",
                        lines=18,
                        placeholder="Your transcript will appear here..."
                    )
                with gr.Tab("Download .txt"):
                    plain_output = gr.Textbox(label="", lines=12, visible=False)
                    gr.Markdown("<div style='height:6px'></div>")
                    download_btn = gr.Button("Save transcript", variant="secondary")
                    download_file = gr.File(label="")

    def transcribe(file, model_name, language, show_timestamps, translate):
        if file is None:
            return "⚠️ Please upload a file first.", ""

        model = load_model(model_name)

        lang = None if language == "Auto Detect" else language
        task = "translate" if translate == "Translate to English" else "transcribe"

        # Handle Hinglish — transcribe in Hindi then romanize output
        if language == "Hinglish (Roman)":
            lang = "hi"
            result = model.transcribe(file.name, language=lang, task=task)
            for seg in result["segments"]:
                seg["text"] = devanagari_to_roman(seg["text"])
            result["text"] = devanagari_to_roman(result["text"])
        else:
            result = model.transcribe(file.name, language=lang, task=task)

        if show_timestamps:
            lines = []
            for seg in result["segments"]:
                start = format_time(seg["start"])
                end   = format_time(seg["end"])
                lines.append(f"[{start} → {end}]  {seg['text'].strip()}")
            transcript = "\n".join(lines)
        else:
            transcript = result["text"].strip()

        return transcript, transcript

    def run(file, model_raw, language, timestamps, translate):
        model_name = model_raw.split()[0].strip()
        return transcribe(file, model_name, language, timestamps, translate)

    submit_btn.click(
        fn=run,
        inputs=[file_input, model_choice, language, timestamps, translate],
        outputs=[output, plain_output]
    )

if __name__ == "__main__":
    demo.launch(css=custom_css)