package server

import (
	"context"
	"fmt"
	"net/http"
	"sync/atomic"
	"time"

	"chat-agent-system/internal/artifactvault"
	"chat-agent-system/internal/config"
)

// Vault HTTP + in-process publisher stubs for U7 incremental.
// Default: FAV_PUBLISHER_ENABLED=false, FAV_DEGRADED_READ=false.
// Full ingest hooks / enumerate backfill remain on feature/final-artifact-vault.

func (s *Server) initArtifactVault() {
	if s == nil || s.cfg == nil {
		return
	}
	// Publisher store stays nil unless explicitly enabled AND vault roots are set.
	if !s.cfg.FAVPublisherEnabled {
		return
	}
	if s.cfg.VaultStateRoot == "" || s.cfg.VaultMasterKey == "" {
		return
	}
	if err := config.ValidateIndependentVault(s.cfg.VaultStateRoot, s.cfg.DataDir); err != nil {
		return
	}
	ident := s.cfg.VaultStorageIdentity
	if ident == "" {
		env := s.cfg.Env
		if env == "" {
			env = "dev"
		}
		ident = "vault-" + env
	}
	store, err := artifactvault.NewFilesystemStore(s.cfg.VaultStateRoot, ident, []byte(s.cfg.VaultMasterKey))
	if err != nil {
		return
	}
	var reg artifactvault.Registry
	if s.pool != nil {
		reg = artifactvault.NewPGRegistry(s.pool)
	} else {
		reg = artifactvault.NewMemoryRegistry()
	}
	s.vaultStore = store
	s.vaultReg = reg
	s.vaultPub = &artifactvault.Publisher{Reg: reg, Store: store}
}

func (s *Server) startVaultPublisher() {
	if s == nil || s.vaultPub == nil || s.cfg == nil || !s.cfg.FAVPublisherEnabled {
		return
	}
	go func() {
		t := time.NewTicker(2 * time.Second)
		defer t.Stop()
		for range t.C {
			_ = s.vaultPub.Drain(context.Background())
		}
	}()
	atomic.StoreInt32(&s.vaultPublisherStarted, 1)
}

func (s *Server) tryVaultDegraded(ctx context.Context, env, logical, projectKey string) ([]byte, string, error) {
	if s == nil || s.vaultPub == nil || s.cfg == nil || !s.cfg.FAVDegradedRead {
		return nil, "", fmt.Errorf("artifactvault: degraded read disabled")
	}
	return s.vaultPub.DegradedPayload(ctx, env, logical, projectKey)
}

func (s *Server) handleVaultStatus(w http.ResponseWriter, r *http.Request) {
	_ = r
	cfg := s.cfg
	degraded := false
	publisher := false
	storeReady := false
	if cfg != nil {
		degraded = cfg.FAVDegradedRead
		publisher = cfg.FAVPublisherEnabled
	}
	if s.vaultStore != nil {
		storeReady = true
	}
	writeJSONResponse(w, http.StatusOK, map[string]any{
		"status":             "ok",
		"consumer":           "fav",
		"consumer_mode":      "off",
		"publisher_enabled":  publisher,
		"publisher_running":  atomic.LoadInt32(&s.vaultPublisherStarted) == 1,
		"degraded_read":      degraded,
		"store_configured":   storeReady,
		"subscriber_default": false,
		"shadow_observe":     true,
		"would_stage":        false,
		"would_publish":      false,
		"live_not_opened":    true,
		"note":               "fav consumer remains OFF until separate approval; shadow computes intended outcome only; full FAV branch not merged",
	})
}

func (s *Server) vaultPublisherRunning() bool {
	return atomic.LoadInt32(&s.vaultPublisherStarted) == 1
}