import csv
import sys
import os
from app import app
from extensions import db
from models.notepad import Notepad
from models.note import Note
from models.user import User

def seed_from_csv(csv_file, notepad_name, is_public=True, owner_email=None):
    """
    Reads a CSV file and populates a notepad with notes.
    CSV Format: title, content, lat, lng
    """
    if not os.path.exists(csv_file):
        print(f"Error: File '{csv_file}' not found.")
        return

    with app.app_context():
        # 1. Resolve Owner (Optional)
        user_id = None
        if owner_email:
            user = User.query.filter_by(email=owner_email).first()
            if user:
                user_id = user.id
            else:
                print(f"Warning: User with email '{owner_email}' not found. Notepad will be unowned.")

        # 2. Find or Create Notepad
        notepad = Notepad.query.filter_by(name=notepad_name).first()
        if not notepad:
            print(f"Creating new notepad: '{notepad_name}'")
            notepad = Notepad(name=notepad_name, is_public=is_public, user_id=user_id)
            db.session.add(notepad)
            db.session.commit()
        else:
            print(f"Using existing notepad: '{notepad.name}' (ID: {notepad.id})")

        # 3. Read CSV and Create Notes
        try:
            with open(csv_file, 'r', encoding='utf-8') as f:
                reader = csv.DictReader(f)
                count = 0
                for row in reader:
                    # Basic validation
                    if not all(k in row for k in ('title', 'content', 'lat', 'lng')):
                        print(f"Skipping invalid row: {row}")
                        continue
                    
                    try:
                        note = Note(
                            title=row['title'],
                            content=row['content'],
                            lat=float(row['lat']),
                            lng=float(row['lng']),
                            notepad_id=notepad.id
                        )
                        db.session.add(note)
                        count += 1
                    except ValueError:
                        print(f"Invalid coordinates in row: {row['title']}")
                        continue
                
                db.session.commit()
                print(f"Success! Added {count} notes to '{notepad_name}'.")
                
        except Exception as e:
            print(f"An error occurred: {e}")
            db.session.rollback()

if __name__ == "__main__":
    if len(sys.argv) < 3:
        print("Usage: python seed_notes.py <csv_file> <notepad_name> [owner_email]")
        sys.exit(1)
    
    csv_path = sys.argv[1]
    pad_name = sys.argv[2]
    owner = sys.argv[3] if len(sys.argv) > 3 else None

    seed_from_csv(csv_path, pad_name, is_public=True, owner_email=owner)