import os
import sys
import shutil
import requests
import re
from tqdm import tqdm
from datetime import datetime

# 📌 Konfiguration
API_URL = "http://localhost:8000/embed"
CHUNK_SIZE = 500
OVERLAP = 100
BATCH_SIZE = 20

# 📁 Kommandozeilenparameter auswerten
if len(sys.argv) != 2:
    print("❌ Bitte gib eine Kategorie an, z. B.: python import_txtdocuments.py karatetrainer")
    sys.exit(1)

CATEGORY = sys.argv[1]
SOURCE_DIR = os.path.expanduser(f"~/knowledge/{CATEGORY}")
ARCHIVE_DIR = os.path.join(SOURCE_DIR, "_imported")
COLLECTION = CATEGORY

if not os.path.exists(SOURCE_DIR):
    print(f"❌ Der Ordner '{SOURCE_DIR}' existiert nicht.")
    sys.exit(1)

os.makedirs(ARCHIVE_DIR, exist_ok=True)

print(f"📁 Lese Dokumente aus: {SOURCE_DIR}")
print(f"📂 Archivierte Dateien: {ARCHIVE_DIR}")
print(f"🎯 Ziel-Collection: {COLLECTION}")

# 🔧 Text in überlappende Chunks aufteilen
#def chunk_text(text, size=CHUNK_SIZE, overlap=OVERLAP):
#    chunks = []
#    start = 0
#    while start < len(text):
#        end = min(start + size, len(text))
#        chunks.append(text[start:end])
#        start += size - overlap
#    return chunks

def chunk_text_paragraphs(text, max_length=500):
    paragraphs = re.split(r'\n\s*\n', text.strip())  # Absatztrennung
    chunks = []
    current_chunk = ""

    for para in paragraphs:
        if len(current_chunk) + len(para) + 2 <= max_length:
            current_chunk += para + "\n\n"
        else:
            if current_chunk:
                chunks.append(current_chunk.strip())
            # Falls einzelner Absatz zu groß ist, hart splitten
            if len(para) > max_length:
                for i in range(0, len(para), max_length):
                    chunks.append(para[i:i+max_length].strip())
                current_chunk = ""
            else:
                current_chunk = para + "\n\n"
    
    if current_chunk:
        chunks.append(current_chunk.strip())
    return chunks


# 📚 Alle .txt-Dateien im Ordner lesen
def read_all_text_files(folder):
    file_chunk_map = {}  # Map: filename → chunks
    for filename in os.listdir(folder):
        if filename.endswith(".txt"):
            path = os.path.join(folder, filename)
            with open(path, "r", encoding="utf-8") as f:
                text = f.read()
                file_chunk_map[filename] = chunk_text_paragraphs(text)
    return file_chunk_map

# 🧱 Strukturierte Payloads vorbereiten
def prepare_payloads(file_chunk_map, collection):
    payloads = []
    imported_at = datetime.now().isoformat()

    for filename, chunks in file_chunk_map.items():
        for local_index, chunk in enumerate(chunks):
            payload = {
                "text": chunk,
                "source": filename,
                "type": "file",
                "category": collection,
                "imported_at": imported_at,
                "chunk_index": local_index
            }
            payloads.append(payload)
    for p in payloads:
        print(f"{p['source']}: chunk_index={p['chunk_index']}")

    return payloads

# 📤 An API senden
def embed_chunks_in_batches(payloads, collection):
    results = []
    for i in tqdm(range(0, len(payloads), BATCH_SIZE), desc="📡 Embedding"):
        batch = payloads[i:i + BATCH_SIZE]
        response = requests.post(API_URL, json={"chunks": batch, "collection": collection})
        response.raise_for_status()
        results.append(response.json())
    return results

# 🚀 Hauptlogik
if __name__ == "__main__":
    file_chunk_map = read_all_text_files(SOURCE_DIR)
    processed_files = list(file_chunk_map.keys())
    payloads = prepare_payloads(file_chunk_map, COLLECTION)

    if not payloads:
        print("⚠️ Keine Textabschnitte gefunden.")
        sys.exit(0)

    print(f"📦 {len(payloads)} Textabschnitte aus {len(processed_files)} Dateien gefunden. Sende an API...")

    try:
        result = embed_chunks_in_batches(payloads, COLLECTION)
        print(f"\n✅ Embedding abgeschlossen: {len(result)} API-Antwort(en) erhalten.")

        # 🗃️ Verarbeitete Dateien archivieren
        for filename in processed_files:
            src = os.path.join(SOURCE_DIR, filename)
            dst = os.path.join(ARCHIVE_DIR, filename)
            shutil.move(src, dst)
        print(f"📁 {len(processed_files)} Dateien verschoben nach _imported.")

    except Exception as e:
        print(f"❌ Fehler beim Senden: {e}")