"""
Generate encrypted request payload for Postman
"""
import base64
import gzip
import json
import sys
import os
from nacl.secret import SecretBox
from nacl.utils import random

# Your 64-character hex key from .env
SECRET_KEY_HEX = "7633eeaf69156124e49025ce8f6a3adbdbf6be87f1e58529397a67168a65bd66"

# Convert hex to bytes (32 bytes)
SECRET_KEY = bytes.fromhex(SECRET_KEY_HEX)

if len(SECRET_KEY) != 32:
    print(f"❌ ERROR: Key must be 32 bytes, got {len(SECRET_KEY)}")
    sys.exit(1)

print(f"✓ Key length: {len(SECRET_KEY)} bytes")

# Get file path
if len(sys.argv) > 1:
    file_path = sys.argv[1]
else:
    file_path = "tests/samples/sample1.pdf"

if not os.path.exists(file_path):
    print(f"❌ File not found: {file_path}")
    sys.exit(1)

print(f"📄 Reading: {file_path}")

# Read your test file
with open(file_path, 'rb') as f:
    file_data = f.read()

print(f"✓ Read {len(file_data):,} bytes")

# Determine file type
if file_path.lower().endswith('.pdf'):
    file_type = "pdf"
elif file_path.lower().endswith(('.jpg', '.jpeg', '.png', '.tiff', '.bmp')):
    file_type = "image"
else:
    file_type = "image"  # default

print(f"📋 File type: {file_type}")

# Prepare payload
payload = {
    "filename": os.path.basename(file_path),
    "file_type": file_type,
    "file_data": base64.b64encode(file_data).decode('utf-8'),
    "patient_id": "TEST_001"
}

print("🔐 Encrypting...")

# Encrypt
json_data = json.dumps(payload).encode('utf-8')
compressed = gzip.compress(json_data, compresslevel=6)
compressed_b64 = base64.b64encode(compressed).decode('utf-8')

box = SecretBox(SECRET_KEY)  # Use bytes directly, not .encode()
nonce = random(SecretBox.NONCE_SIZE)
ciphertext = box.encrypt(compressed_b64.encode('utf-8'), nonce)

encrypted_request = {
    "ciphertext": base64.b64encode(ciphertext.ciphertext).decode('utf-8'),
    "nonce": base64.b64encode(nonce).decode('utf-8')
}

# Save for Postman
with open('postman_request.json', 'w') as f:
    json.dump(encrypted_request, f, indent=2)

print("\n" + "="*70)
print("✓ Generated postman_request.json")
print("="*70)

print("\n📋 COPY THIS JSON FOR POSTMAN:")
print("-"*70)
print(json.dumps(encrypted_request, indent=2))
print("-"*70)

print("\n📝 POSTMAN INSTRUCTIONS:")
print("1. Method: POST")
print("2. URL: http://localhost:8000/analyze-lab-secure")
print("3. Headers: Content-Type = application/json")
print("4. Body → raw → JSON")
print("5. Paste the JSON above")
print("6. Click Send")
print("\n✅ Done!")