gogobee/internal/plugin/dnd_expedition_threat.go

package plugin

import (
	"fmt"

	"gogobee/internal/flavor"
)

// Phase 12 E2a — Threat Clock state machine.
// Spec: gogobee_expedition_system.md §8.
//
// E1a already shipped the persistence (applyThreatDelta, ThreatEvent,
// threat_level / threat_siege columns). This file layers the threshold
// model on top: labels, per-band combat effects, threshold-crossing log
// flavor, and the daily threat drift applied at briefing rollover.
//
// Combat-driven modifiers (combat-in-new-room +5, escape +10, loud-ability
// +8) require the combat engine to know about expeditions, which it does
// not yet. They land alongside the !advance/combat hookup in a later phase;
// this file is wired into the bits we *can* drive: day rollover + boss
// defeat + manual threat events from camp/extraction logic.

// ThreatBand is the bracketed state of the threat clock.
type ThreatBand int

const (
	ThreatBandQuiet ThreatBand = iota
	ThreatBandStirring
	ThreatBandAlert
	ThreatBandHostile
	ThreatBandSiege
)

// ThreatBandInfo bundles the per-band display + combat-side knobs.
// AC/Init/Perception adjustments are applied by the combat engine when
// it reads the active expedition's threat band; SupplyMult feeds into
// currentBurn() (already wired); ShortRest disabled is checked by the
// rest plumbing once expedition combat is wired.
type ThreatBandInfo struct {
	Band       ThreatBand
	Label      string
	Perception int     // enemy passive perception bonus
	AC         int     // enemy AC bonus
	InitAdv    bool    // enemy initiative advantage
	TrapsArm   bool    // re-arm cleared traps each day
	SupplyMult float32 // multiplier on daily supply burn
	NoShortRest bool   // siege-mode only
}

// threatBandFor returns the band for a given level, honouring siege override.
func threatBandFor(level int, siege bool) ThreatBand {
	if siege || level >= 81 {
		return ThreatBandSiege
	}
	switch {
	case level >= 61:
		return ThreatBandHostile
	case level >= 41:
		return ThreatBandAlert
	case level >= 21:
		return ThreatBandStirring
	default:
		return ThreatBandQuiet
	}
}

// threatBandInfo returns the descriptor for a band.
func threatBandInfo(b ThreatBand) ThreatBandInfo {
	switch b {
	case ThreatBandStirring:
		return ThreatBandInfo{Band: b, Label: "Stirring", Perception: 1, SupplyMult: 1}
	case ThreatBandAlert:
		return ThreatBandInfo{Band: b, Label: "Alert", AC: 2, Perception: 2, SupplyMult: 1}
	case ThreatBandHostile:
		return ThreatBandInfo{Band: b, Label: "Hostile", AC: 2, Perception: 2, InitAdv: true, TrapsArm: true, SupplyMult: 1}
	case ThreatBandSiege:
		return ThreatBandInfo{Band: b, Label: "Siege", AC: 2, Perception: 2, InitAdv: true, TrapsArm: true, SupplyMult: 2, NoShortRest: true}
	}
	return ThreatBandInfo{Band: ThreatBandQuiet, Label: "Quiet", SupplyMult: 1}
}

// dailyThreatDrift is the +3/day base (§8.1) plus the GMMood-driven mod
// (Wrathful +5, Elated -3). Mood bands map: effusive (≥80) → Elated,
// hostile (<20) → Wrathful, the middle three are neutral.
func dailyThreatDrift(gmMood int) (int, string) {
	base := 3
	mod := 0
	tag := ""
	switch {
	case gmMood >= 80:
		mod = -3
		tag = "elated"
	case gmMood < 20:
		mod = 5
		tag = "wrathful"
	}
	delta := base + mod
	reason := "day passes in zone"
	if tag != "" {
		reason = fmt.Sprintf("day passes in zone (%s mood mod %+d)", tag, mod)
	}
	return delta, reason
}

// applyDailyThreatDrift applies the per-day threat increment at briefing
// rollover. No-op once the boss has been defeated (the zone has nothing
// left to escalate). Returns the delta actually applied.
func applyDailyThreatDrift(e *Expedition) (int, string, error) {
	if e.BossDefeated {
		return 0, "", nil
	}
	delta, reason := dailyThreatDrift(e.GMMood)
	if delta == 0 {
		return 0, reason, nil
	}
	prevBand := threatBandFor(e.ThreatLevel, e.SiegeMode)
	if err := applyThreatDelta(e.ID, delta, reason); err != nil {
		return 0, reason, err
	}
	// Mirror the change in-memory so the caller can render it.
	e.ThreatLevel += delta
	if e.ThreatLevel > 100 {
		e.ThreatLevel = 100
	}
	if e.ThreatLevel < 0 {
		e.ThreatLevel = 0
	}
	if e.ThreatLevel >= 100 {
		e.SiegeMode = true
	}
	newBand := threatBandFor(e.ThreatLevel, e.SiegeMode)
	if newBand != prevBand && newBand > prevBand {
		_ = appendThreatTransitionLog(e, newBand)
	}
	return delta, reason, nil
}

// appendThreatTransitionLog records a band-crossing in the expedition log
// with the prewritten TwinBee narration for that band.
func appendThreatTransitionLog(e *Expedition, band ThreatBand) error {
	var pool []string
	switch band {
	case ThreatBandStirring:
		pool = flavor.ThreatClockStirring
	case ThreatBandAlert:
		pool = flavor.ThreatClockAlert
	case ThreatBandHostile:
		pool = flavor.ThreatClockHostile
	case ThreatBandSiege:
		pool = flavor.ThreatClockSiege
	default:
		return nil
	}
	line := flavor.Pick(pool)
	info := threatBandInfo(band)
	summary := fmt.Sprintf("threat clock crossed into %s (%d/100)", info.Label, e.ThreatLevel)
	return appendExpeditionLog(e.ID, e.CurrentDay, "threat", summary, line)
}

// applyBossDefeatThreat records the -20 threat drop when a zone boss is
// killed (§8.1). Caller wires it from the combat completion path once
// expedition combat is hooked up.
func applyBossDefeatThreat(expID string) error {
	return applyThreatDelta(expID, -20, "boss defeated")
}