package app

import (
	"net/http"
)

func handleTransportPolicies(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	transportMu.Lock()
	policy := loadTransportPolicyState()
	clientsState := loadTransportClientsState()
	plan := loadTransportPolicyCompilePlan()
	planSnapshot := captureTransportPolicyPlanStateSnapshot(policy, plan)
	transportMu.Unlock()

	policyTargets := transportPolicyClientsWithVirtualTargets(clientsState.Items)
	nextPlan, planChanged := compileTransportPolicyPlanForSnapshot(policy, policyTargets, plan)
	if planChanged {
		_ = saveTransportPlanIfSnapshotCurrent(planSnapshot, nextPlan)
	}

	writeJSON(w, http.StatusOK, TransportPolicyResponse{
		OK:             true,
		Message:        "ok",
		PolicyRevision: policy.Revision,
		Intents:        policy.Intents,
		Plan:           &nextPlan,
	})
}

func handleTransportConflicts(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	transportMu.Lock()
	st := loadTransportConflictsState()
	transportMu.Unlock()
	writeJSON(w, http.StatusOK, TransportConflictsResponse{
		OK:          true,
		Message:     "ok",
		HasBlocking: st.HasBlocking,
		Items:       st.Items,
	})
}

func handleTransportOwnership(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	transportMu.Lock()
	policy := loadTransportPolicyState()
	clientsState := loadTransportClientsState()
	owners := loadTransportOwnershipState()
	plan := loadTransportPolicyCompilePlan()
	planSnapshot := captureTransportPolicyPlanStateSnapshot(policy, plan)
	ownershipSnapshot := captureTransportOwnershipStateSnapshot(policy, owners)
	transportMu.Unlock()

	policyTargets := transportPolicyClientsWithVirtualTargets(clientsState.Items)
	nextPlan, planChanged := compileTransportPolicyPlanForSnapshot(policy, policyTargets, plan)
	if planChanged {
		_ = saveTransportPlanIfSnapshotCurrent(planSnapshot, nextPlan)
	}
	planDigest := digestTransportPolicyCompilePlan(nextPlan)
	if transportOwnershipNeedsRebuild(policy.Revision, owners, planDigest) {
		owners = buildTransportOwnershipStateFromPlan(nextPlan, policy.Revision)
		_ = saveTransportOwnershipIfSnapshotCurrent(ownershipSnapshot, owners)
	}
	items, lockCount := attachTransportOwnershipLockState(owners.Items, policyTargets)
	writeJSON(w, http.StatusOK, TransportOwnershipResponse{
		OK:             true,
		Message:        "ok",
		PolicyRevision: owners.PolicyRevision,
		PlanDigest:     owners.PlanDigest,
		Count:          len(items),
		LockCount:      lockCount,
		Items:          items,
	})
}

func handleTransportOwnerLocks(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	transportMu.Lock()
	locks := loadTransportOwnerLocksState()
	transportMu.Unlock()
	writeJSON(w, http.StatusOK, TransportOwnerLocksResponse{
		OK:             true,
		Message:        "ok",
		PolicyRevision: locks.PolicyRevision,
		Count:          len(locks.Items),
		Items:          locks.Items,
	})
}

func handleTransportCapabilities(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	writeJSON(w, http.StatusOK, TransportCapabilitiesResponse{
		OK:      true,
		Message: "ok",
		Clients: map[string]map[string]bool{
			"singbox":    {"tcp": true, "udp": true, "dns_tunnel": true, "ssh_tunnel": false},
			"dnstt":      {"tcp": true, "udp": false, "dns_tunnel": true, "ssh_tunnel": true},
			"phoenix":    {"tcp": true, "udp": true, "dns_tunnel": false, "ssh_tunnel": true},
			"adguardvpn": {"vpn": true, "autoloop": true, "dns_tunnel": false, "ssh_tunnel": false},
		},
		RuntimeModes: map[string]bool{
			"exec":     true,
			"embedded": false,
			"sidecar":  false,
		},
		PackagingProfiles: map[string]bool{
			"system":  true,
			"bundled": true,
		},
		Lifecycle:     []string{"provision", "start", "stop", "restart"},
		HealthFields:  []string{"status", "latency_ms", "last_error", "health.last_check"},
		MetricsFields: []string{"restarts", "state_changes", "uptime_sec", "last_transition_at"},
		ErrorCodes: []string{
			"TRANSPORT_CLIENT_NOT_FOUND",
			"TRANSPORT_CLIENT_SAVE_FAILED",
			"TRANSPORT_CLIENT_DEGRADED",
			"BACKEND_RUNTIME_ERROR",
			"TRANSPORT_BACKEND_NETNS_SETUP_FAILED",
			"TRANSPORT_BACKEND_BOOTSTRAP_BYPASS_FAILED",
			"TRANSPORT_BACKEND_SINGBOX_DNS_MIGRATE_FAILED",
			"TRANSPORT_BACKEND_UNIT_REQUIRED",
			"TRANSPORT_BACKEND_ACTION_FAILED",
			"TRANSPORT_BACKEND_HEALTH_FAILED",
			"TRANSPORT_BACKEND_PROVISION_CONFIG_REQUIRED",
			"TRANSPORT_BACKEND_PROVISION_FAILED",
			"TRANSPORT_BACKEND_RUNTIME_MODE_UNSUPPORTED",
		},
	})
}