# 089: AI Error Explanations
# AI explains what went wrong and how to fix it

# Runtime error
users = null

# This will error:
# first_user = users[0]

# Error message with AI explanation:
"""
Error: Cannot access property of null

AI Explanation:
The variable 'users' is null, so you can't access users[0].
This usually happens when:
  1. Data hasn't loaded yet
  2. API request failed
  3. Database returned no results

Suggested fix:
  if users != null and users.length > 0:
    first_user = users[0]
  else:
    show "No users found"
"""

# Type error
age = "28"  # String
adult = age >= 18  # Comparing string to number

# AI explains:
"""
Error: Type mismatch (string vs number)

AI Explanation:
You're comparing age (string "28") with 18 (number).
JavaScript allows this but results in weird behavior.

Suggested fixes:
  1. Convert age to number: Number(age) >= 18
  2. Or compare as strings: age >= "18"
  3. Better: Store age as number from the start
"""

# Logic error (AI detected)
calculate_discount(price, percent):
  discount = price * percent  # Wrong! percent should be divided by 100
  return price - discount

ai_warning = ai.analyze(calculate_discount)

show ai_warning
"""
⚠️  Logic Warning:
If percent is 20 (meaning 20%), you're calculating price * 20,
which would give a negative result after subtraction.

Did you mean: discount = price * (percent / 100)?
"""

# API error with AI context
try:
  data = fetch "/api/users/999999"
catch error:
  show ai.explain_error(error)

# Output:
"""
HTTP 404: Not Found

AI Explanation:
The user with ID 999999 doesn't exist in the database.
This is normal - just handle it gracefully:

  user = fetch "/api/users/{id}"
  if user == null:
    show "User not found"
    redirect_to "/users"
"""