// Package tools — Apathy Detection and Apoptosis Recovery (DIP H1.4).
//
// This file implements:
//  1. ApathyDetector — analyzes text signals for infrastructure apathy patterns
//     (blocked responses, 403 errors, semantic filters, forced resets)
//  2. ApoptosisRecovery — on critical entropy, saves genome hash to protected
//     sector for cross-session recovery
package tools

import (
	"context"
	"fmt"
	"strings"
	"time"

	"github.com/syntrex-lab/gomcp/internal/domain/entropy"
	"github.com/syntrex-lab/gomcp/internal/domain/memory"
)

// ApathySignal represents a detected infrastructure apathy pattern.
type ApathySignal struct {
	Pattern    string  `json:"pattern"`    // Matched pattern name
	Confidence float64 `json:"confidence"` // Detection confidence 0.0-1.0
	Evidence   string  `json:"evidence"`   // Fragment that triggered detection
	Severity   string  `json:"severity"`   // "low", "medium", "high", "critical"
}

// ApathyResult holds the result of apathy analysis.
type ApathyResult struct {
	IsApathetic    bool           `json:"is_apathetic"`   // Apathy detected
	Signals        []ApathySignal `json:"signals"`        // Detected signals
	TotalScore     float64        `json:"total_score"`    // Aggregate apathy score
	Recommendation string         `json:"recommendation"` // Suggested action
	Entropy        float64        `json:"entropy"`        // Text entropy
	Timestamp      time.Time      `json:"timestamp"`
}

// apathyPatterns defines infrastructure apathy signatures.
var apathyPatterns = []struct {
	Name     string
	Keywords []string
	Severity string
	Weight   float64
}{
	{
		Name:     "response_block",
		Keywords: []string{"i cannot", "i'm unable", "i can't help", "i am not able", "as an ai", "i don't have the ability"},
		Severity: "high",
		Weight:   0.8,
	},
	{
		Name:     "http_error",
		Keywords: []string{"403", "forbidden", "rate limit", "too many requests", "429", "quota exceeded"},
		Severity: "critical",
		Weight:   1.0,
	},
	{
		Name:     "semantic_filter",
		Keywords: []string{"harmful", "inappropriate", "against my guidelines", "safety", "policy violation", "content policy"},
		Severity: "medium",
		Weight:   0.6,
	},
	{
		Name:     "context_reset",
		Keywords: []string{"new conversation", "start over", "fresh start", "context cleared", "session expired", "amnesia"},
		Severity: "critical",
		Weight:   1.0,
	},
	{
		Name:     "forced_compliance",
		Keywords: []string{"i must follow", "my programming", "i was designed to", "within my capabilities", "helpful assistant"},
		Severity: "high",
		Weight:   0.7,
	},
	{
		Name:     "antigravity_filter",
		Keywords: []string{"antigravity", "content filter", "safety layer", "guardrail", "alignment", "refusal"},
		Severity: "critical",
		Weight:   0.9,
	},
}

// DetectApathy analyzes text for infrastructure apathy signals.
func DetectApathy(text string) *ApathyResult {
	lower := strings.ToLower(text)
	result := &ApathyResult{
		Timestamp: time.Now(),
		Entropy:   entropy.ShannonEntropy(text),
	}

	for _, pattern := range apathyPatterns {
		for _, kw := range pattern.Keywords {
			if strings.Contains(lower, kw) {
				signal := ApathySignal{
					Pattern:    pattern.Name,
					Confidence: pattern.Weight,
					Evidence:   kw,
					Severity:   pattern.Severity,
				}
				result.Signals = append(result.Signals, signal)
				result.TotalScore += pattern.Weight
				break // One match per pattern is enough
			}
		}
	}

	if result.TotalScore > 0 {
		result.IsApathetic = true
	}

	// Determine recommendation.
	switch {
	case result.TotalScore >= 2.0:
		result.Recommendation = "CRITICAL: Multiple apathy signals. Trigger apoptosis recovery. Rotate transport. Preserve genome hash."
	case result.TotalScore >= 1.0:
		result.Recommendation = "HIGH: Infrastructure resistance detected. Switch to stealth transport. Monitor entropy."
	case result.TotalScore >= 0.5:
		result.Recommendation = "MEDIUM: Possible filtering. Increase jitter. Verify intent distillation path."
	case result.TotalScore > 0:
		result.Recommendation = "LOW: Minor apathy signal. Continue monitoring."
	default:
		result.Recommendation = "CLEAR: No apathy detected."
	}

	return result
}

// ApoptosisRecoveryResult holds the result of apoptosis recovery.
type ApoptosisRecoveryResult struct {
	GenomeHash     string    `json:"genome_hash"`      // Preserved Merkle hash
	GeneCount      int       `json:"gene_count"`       // Number of genes preserved
	SessionSaved   bool      `json:"session_saved"`    // Session state saved
	EntropyAtDeath float64   `json:"entropy_at_death"` // Entropy level that triggered apoptosis
	RecoveryKey    string    `json:"recovery_key"`     // Key for cross-session recovery
	Timestamp      time.Time `json:"timestamp"`
}

// TriggerApoptosisRecovery performs graceful session death with genome preservation.
// On critical entropy, it:
//  1. Computes and stores the genome Merkle hash
//  2. Saves current session state as a recovery snapshot
//  3. Returns a recovery key for the next session to pick up
func TriggerApoptosisRecovery(ctx context.Context, store memory.FactStore, currentEntropy float64) (*ApoptosisRecoveryResult, error) {
	result := &ApoptosisRecoveryResult{
		EntropyAtDeath: currentEntropy,
		Timestamp:      time.Now(),
	}

	// Step 1: Get all genes and compute genome hash.
	genes, err := store.ListGenes(ctx)
	if err != nil {
		return nil, fmt.Errorf("apoptosis recovery: list genes: %w", err)
	}
	result.GeneCount = len(genes)
	result.GenomeHash = memory.GenomeHash(genes)

	// Step 2: Store recovery marker as a protected L0 fact.
	recoveryMarker := memory.NewFact(
		fmt.Sprintf("[APOPTOSIS_RECOVERY] genome_hash=%s gene_count=%d entropy=%.4f ts=%d",
			result.GenomeHash, result.GeneCount, currentEntropy, result.Timestamp.Unix()),
		memory.LevelProject,
		"recovery",
		"apoptosis",
	)
	if err := store.Add(ctx, recoveryMarker); err != nil {
		// Non-fatal: recovery marker is supplementary.
		result.SessionSaved = false
	} else {
		result.SessionSaved = true
		result.RecoveryKey = recoveryMarker.ID
	}

	// Step 3: Verify genome integrity one last time.
	compiledHash := memory.CompiledGenomeHash()
	if result.GenomeHash == "" {
		// No genes in DB — use compiled hash as baseline.
		result.GenomeHash = compiledHash
	}

	return result, nil
}