bamort/backend/doc/DERIVED_VALUES.md

Derived Values Implementation

Summary

Static derived values (Resistenz Körper, Resistenz Geist, Abwehr, Zaubern, Raufen) are now stored in the database as part of the Char model. These values can increase when a new grade is reached.

Bonus values are calculated on-demand from the character's attributes using the CalculateBonuses() method.

Database Fields Added to Char

• ResistenzKoerper (int) - Resistenz Körper base value
• ResistenzGeist (int) - Resistenz Geist base value
• Abwehr (int) - Abwehr base value
• Zaubern (int) - Zaubern base value
• Raufen (int) - Raufen base value

Calculated Bonuses (Not Stored)

The following bonuses are calculated from attributes and are NOT stored in the database:

• AusdauerBonus = Ko/10 + St/20
• SchadensBonus = St/20 + Gs/30 - 3
• AngriffsBonus = attribute bonus from Gs
• AbwehrBonus = attribute bonus from Gw
• ZauberBonus = attribute bonus from Zt
• ResistenzBonusKoerper = attribute/race bonus from Ko
• ResistenzBonusGeist = attribute/race bonus from In

Usage Example

// Load character from database
var char models.Char
err := char.FirstID("123")

// Get static derived values (stored in DB)
resistenzKoerper := char.ResistenzKoerper
abwehr := char.Abwehr

// Calculate bonuses from attributes (on-demand)
bonuses := char.CalculateBonuses()
abwehrBonus := bonuses.AbwehrBonus
zauberBonus := bonuses.ZauberBonus

// Total values
totalAbwehr := char.Abwehr + bonuses.AbwehrBonus
totalZaubern := char.Zaubern + bonuses.ZauberBonus

When Grade Increases

When a character reaches a new grade, the static derived values may increase. To update them:

// After grade increase, recalculate and update static values
char.Grad++
char.ResistenzKoerper++ // or apply the appropriate grade bonus
char.Abwehr++
// Save updated character
database.DB.Save(&char)

Bonuses will automatically reflect any attribute changes without needing to update the database, as they are calculated on-demand from the Eigenschaften values.