import gradio as gr
import requests
import json
import os
import time
from collections import defaultdict

BASE_URL = "https://api.jigsawstack.com/v1"
headers = {
    "x-api-key": os.getenv("JIGSAWSTACK_API_KEY")
}


# Rate limiting configuration
request_times = defaultdict(list)
MAX_REQUESTS = 20  # Maximum requests per time window
TIME_WINDOW = 3600   # Time window in seconds (1 hour)

def get_real_ip(request: gr.Request):
    """Extract real IP address using x-forwarded-for header or fallback"""
    if not request:
        return "unknown"
    
    forwarded = request.headers.get("x-forwarded-for")
    if forwarded:
        ip = forwarded.split(",")[0].strip()  # First IP in the list is the client's
    else:
        ip = request.client.host  # fallback
    return ip

def check_rate_limit(request: gr.Request):
    """Check if the current request exceeds rate limits"""
    if not request:
        return True, "Rate limit check failed - no request info"
    
    ip = get_real_ip(request)
    now = time.time()

    # Clean up old timestamps outside the time window
    request_times[ip] = [t for t in request_times[ip] if now - t < TIME_WINDOW]
    

    # Check if rate limit exceeded
    if len(request_times[ip]) >= MAX_REQUESTS:
        time_remaining = int(TIME_WINDOW - (now - request_times[ip][0]))
        time_remaining_minutes = round(time_remaining / 60, 1)      
        time_window_minutes = round(TIME_WINDOW / 60, 1)
        return False, f"Rate limit exceeded. You can make {MAX_REQUESTS} requests per {time_window_minutes} minutes. Try again in {time_remaining_minutes} minutes."
    
    # Add current request timestamp
    request_times[ip].append(now)
    return True, ""


def transcribe_audio(input_type, audio_url, file_store_key, language, request: gr.Request):
    """Transcribe audio using JigsawStack Speech-to-Text API"""
    
    # Check rate limit first
    rate_limit_ok, rate_limit_msg = check_rate_limit(request)
    if not rate_limit_ok:
        return rate_limit_msg, ""
    
    if input_type == "Audio URL" and not audio_url:
        return "Error: Please provide an audio URL.", ""
    if input_type == "File Store Key" and not file_store_key:
        return "Error: Please provide a file store key.", ""
    try:
        payload = {}
        if input_type == "Audio URL":
            payload["url"] = audio_url.strip()
        if input_type == "File Store Key":
            payload["file_store_key"] = file_store_key.strip()
        if language:
            payload["language"] = language
        response = requests.post(
            f"{BASE_URL}/ai/transcribe",
            headers=headers,
            json=payload
        )
        response.raise_for_status()
        result = response.json()
        
        if not result.get("success"):
            error_msg = f"Error: API call failed - {result.get('message', 'Unknown error')}"
            return error_msg, ""
        transcribed_text = result.get("text", "")
        return "Transcription completed successfully!", transcribed_text
    except requests.exceptions.RequestException as e:
        return f"Request failed: {str(e)}", ""
    except Exception as e:
        return f"An unexpected error occurred: {str(e)}", ""

with gr.Blocks() as demo:
    gr.Markdown("""
    <div style='text-align: center; margin-bottom: 24px;'>
        <h1 style='font-size:2.2em; margin-bottom: 0.2em;'>🧩 Speech-to-Text Transcription</h1>
        <p style='font-size:1.2em; margin-top: 0;'>Convert speech to text with ease.</p>
        <p style='font-size:1em; margin-top: 0.5em;'>For more details and API usage, see the <a href='https://jigsawstack.com/docs/api-reference/ai/speech-to-text' target='_blank'>documentation</a>.</p>
    </div>
    """)
    with gr.Row():
        with gr.Column():
            gr.Markdown("#### Audio Input")
            input_type = gr.Radio([
                "Audio URL",
                "File Store Key"
            ], value="Audio URL", label="Select Input Type")
            audio_url = gr.Textbox(
                label="Audio URL",
                placeholder="Enter the URL of the audio/video file...",
                visible=True
            )
            file_store_key = gr.Textbox(
                label="File Store Key",
                placeholder="Enter the file store key from JigsawStack File Storage...",
                visible=False
            )
            language = gr.Textbox(
                label="Language (optional)",
                placeholder="e.g., en, es, fr, de, ja, zh... (leave empty for auto-detect)"
            )
            transcribe_btn = gr.Button("Start Transcription", variant="primary")
        with gr.Column():
            gr.Markdown("#### Transcription Result")
            status_message = gr.Textbox(label="Status", interactive=False)
            transcribed_text = gr.Textbox(
                label="Transcribed Text",
                interactive=False,
                lines=10,
                max_lines=20
            )
    def toggle_inputs(selected):
        if selected == "Audio URL":
            return gr.update(visible=True), gr.update(visible=False)
        else:
            return gr.update(visible=False), gr.update(visible=True)
    input_type.change(toggle_inputs, inputs=[input_type], outputs=[audio_url, file_store_key])
    transcribe_btn.click(
        transcribe_audio,
        inputs=[input_type, audio_url, file_store_key, language],
        outputs=[status_message, transcribed_text]
    )

demo.launch()