import os
import sys
import time
from pathlib import Path

# Ensure the app module can be imported from root directory
sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))

from app.services.transcribe import extract_audio, transcribe_audio
from app.services.srt_generator import save_srt, translate_srt
from app.services.precision_patch import apply_precision_patch
from app.main import get_translator

class Logger(object):
    def __init__(self, filename):
        self.terminal = sys.stdout
        self.log = open(filename, "a", encoding="utf-8")
        
    def write(self, message):
        self.terminal.write(message)
        self.log.write(message)
        self.log.flush()

    def flush(self):
        self.terminal.flush()
        self.log.flush()

# Configuration
TEST_VIDEOS_DIR = Path(os.path.dirname(os.path.abspath(__file__))) / "resources" / "test-videos"
TARGET_LANGS = ["ml", "hi"]  # We will test both Malayalam and Hindi
ENGINE = "gemini"    # Using Gemini 1.5 Flash to bypass rate limits ( Add GEMINI_API_KEY=your_key_here to your .env file.)            

def generate_subtitles_test(video_path: str, target_lang: str, engine: str, version: str, reuse_version: str = None) -> str:
    # Setup paths
    base_name = os.path.splitext(os.path.basename(video_path))[0]
    safe_name = "".join([c for c in base_name if c.isalnum() or c in " ._-"]).strip()
    file_id = safe_name if safe_name else "video"
    
    upload_dir = f"app/uploads/{version}"
    subtitles_dir = f"app/subtitles/{version}"
    os.makedirs(upload_dir, exist_ok=True)
    os.makedirs(subtitles_dir, exist_ok=True)
    
    audio_path = f"{upload_dir}/{file_id}_test.wav"
    en_srt_path = f"{subtitles_dir}/{file_id}_test_en.srt"
    target_srt_path = f"{subtitles_dir}/{file_id}_test_{target_lang}.srt"
    
    # Try to reuse from previous version if requested
    if reuse_version and not os.path.exists(en_srt_path):
        old_en_srt = f"app/subtitles/{reuse_version}/{file_id}_test_en.srt"
        if os.path.exists(old_en_srt):
            import shutil
            shutil.copy(old_en_srt, en_srt_path)
            print(f"  --> Reused English SRT from {reuse_version}")
    
    # Only extract and transcribe if English SRT doesn't already exist (avoids running Whisper twice)
    if not os.path.exists(en_srt_path):
        # Extract audio
        extract_audio(video_path, audio_path)
        
        # Transcribe audio to get segments
        segments, info = transcribe_audio(audio_path)
        
        # Correct English transcription errors (brands/names)
        apply_precision_patch(segments)
        
        # Generate English SRT
        save_srt(segments, en_srt_path)
    else:
        if not (reuse_version and os.path.exists(en_srt_path)):
            print(f"  --> Skipping transcription, using cached English SRT")
    
    # Select translator and translate (validation always runs)
    translator = get_translator(engine)
    translate_srt(en_srt_path, target_srt_path, target_lang, translator, validate=True)
    
    # Clean up audio
    if os.path.exists(audio_path):
        os.remove(audio_path)
        
    return target_srt_path

def run_batch_tests():
    batch_version = time.strftime("%I-%M-%p--%d-%m-%Y")
    
    os.makedirs("logs", exist_ok=True)
    log_file = f"logs/batch_test_{batch_version}.txt"
    sys.stdout = Logger(log_file)
    sys.stderr = sys.stdout
    
    # Check for latest transcription to reuse
    reuse_version = None
    subtitles_root = Path("app/subtitles")
    if subtitles_root.exists():
        # Folders are timestamped like 08-48-AM--11-05-2026
        folders = [f.name for f in subtitles_root.iterdir() if f.is_dir() and "--" in f.name]
        if folders:
            # Sorting by name works because they are timestamped
            latest_folder = sorted(folders, reverse=True)[0]
            print(f"\n[?] Found existing transcriptions in: {latest_folder}")
            # Use raw input for simple prompt
            try:
                choice = input("Use the latest transcription to save time? (y/n): ").strip().lower()
                if choice == 'y':
                    reuse_version = latest_folder
                    print(f"✅ Reusing transcriptions from: {reuse_version}\n")
            except EOFError:
                # Handle cases where input is not available
                pass

    print(f"🚀 Starting automated pipeline tests...")
    print(f"📂 Directory: {TEST_VIDEOS_DIR}")
    print(f"⚙️  Engine: {ENGINE}")
    print(f"🌍 Target Languages: {TARGET_LANGS}")
    print(f"🕒 Batch Version: {batch_version}\n")

    videos = sorted(TEST_VIDEOS_DIR.glob("*.mp4"), key=lambda v: v.stat().st_size)
    
    if not videos:
        print("❌ No videos found in test directory.")
        return

    print(f"📋 Processing order (smallest first):")
    for i, v in enumerate(videos, 1):
        print(f"   {i}. {v.name} ({v.stat().st_size / (1024*1024):.1f} MB)")

    for video in videos:
        print(f"\n{'='*60}")
        print(f"🎥 Processing Video: {video.name} (Size: {video.stat().st_size / (1024*1024):.1f} MB)")
        print(f"{'='*60}")
        
        for lang in TARGET_LANGS:
            start_time = time.time()
            print(f"\n---> Running pipeline for [ {lang.upper()} ]")
            try:
                output_srt = generate_subtitles_test(
                    video_path=str(video),
                    target_lang=lang,
                    engine=ENGINE,
                    version=batch_version,
                    reuse_version=reuse_version
                )
                duration = time.time() - start_time
                print(f"✓ Success! Generated SRT: {output_srt}")
                print(f"⏱️ Time taken: {duration:.2f} seconds")
            except Exception as e:
                print(f"❌ Pipeline failed for {lang.upper()}: {e}")
                
    print("\n✅ Batch testing complete!")
    print("📊 Review logs/translation_failures.jsonl to see self-generated architectural insights.")

if __name__ == "__main__":
    run_batch_tests()