package handlers

// workspace.go — WorkspaceHandler struct, constructor, Create, List, Get,
// and the shared scanWorkspaceRow helper. State/Update/Delete and validators
// live in workspace_crud.go.

import (
	"context"
	"database/sql"
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/Molecule-AI/molecule-monorepo/platform/internal/crypto"
	"github.com/Molecule-AI/molecule-monorepo/platform/internal/db"
	"github.com/Molecule-AI/molecule-monorepo/platform/internal/events"
	"github.com/Molecule-AI/molecule-monorepo/platform/internal/models"
	"github.com/Molecule-AI/molecule-monorepo/platform/internal/provisioner"
	"github.com/Molecule-AI/molecule-monorepo/platform/internal/wsauth"
	"github.com/Molecule-AI/molecule-monorepo/platform/pkg/provisionhook"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type WorkspaceHandler struct {
	// broadcaster narrowed from `*events.Broadcaster` to the
	// events.EventEmitter interface (#1814) so tests can substitute a
	// capture-only stub without standing up the real Redis + WS-hub
	// topology. Production callers still pass *events.Broadcaster, which
	// satisfies the interface — see the compile-time assertion in
	// internal/events/broadcaster.go.
	broadcaster events.EventEmitter
	// provisioner narrowed from `*provisioner.Provisioner` to the
	// provisioner.LocalProvisionerAPI interface (#2369) so tests can
	// substitute a stub without standing up the real Docker daemon.
	// Production callers still pass *provisioner.Provisioner via
	// NewWorkspaceHandler, which satisfies the interface — see the
	// compile-time assertion in internal/provisioner/local_provisioner_api.go.
	// Mirrors cpProv's interface-typed field for symmetry across both
	// backends.
	provisioner provisioner.LocalProvisionerAPI
	// cpProv narrowed from `*provisioner.CPProvisioner` to the
	// provisioner.CPProvisionerAPI interface (#1814) so tests can
	// substitute a stub without standing up the real CP HTTP client +
	// auth chain. Production callers still pass *CPProvisioner via
	// SetCPProvisioner, which satisfies the interface — see the
	// compile-time assertion in internal/provisioner/cp_provisioner.go.
	cpProv      provisioner.CPProvisionerAPI
	platformURL string
	configsDir  string // path to workspace-configs-templates/ (for reading templates)
	// envMutators runs registered EnvMutator plugins right before
	// container Start, after built-in secret loads. Nil = no plugins
	// registered; Registry.Run handles a nil receiver as a no-op so the
	// hot path stays a single nil-pointer compare.
	envMutators *provisionhook.Registry
	// stopFnOverride is set exclusively in tests to intercept provisioner.Stop
	// calls made by HibernateWorkspace without requiring a running Docker daemon.
	// Always nil in production; the real provisioner path is used when nil.
	stopFnOverride func(ctx context.Context, workspaceID string)
	// provisionTimeouts caches per-runtime provision-timeout values from
	// template manifests (#2054 phase 2). Lazy-init on first scan; see
	// runtime_provision_timeouts.go for the loader contract.
	provisionTimeouts runtimeProvisionTimeoutsCache
	// namespaceCleanupFn is the I5 (RFC #2728) hook called best-effort
	// during purge to delete the workspace's plugin-side namespace.
	// nil = no-op (default for operators who haven't wired the v2
	// memory plugin). main.go sets this to plugin.DeleteNamespace
	// when MEMORY_PLUGIN_URL is configured.
	namespaceCleanupFn func(ctx context.Context, workspaceID string)
}

func NewWorkspaceHandler(b events.EventEmitter, p *provisioner.Provisioner, platformURL, configsDir string) *WorkspaceHandler {
	h := &WorkspaceHandler{
		broadcaster: b,
		platformURL: platformURL,
		configsDir:  configsDir,
	}
	// Only assign p when the concrete pointer is non-nil. Without this
	// guard, a `NewWorkspaceHandler(..., nil, ...)` call (which all the
	// non-Docker test fixtures use) yields a typed-nil interface — the
	// `if h.provisioner != nil` checks scattered through the SaaS-vs-
	// Docker fork would incorrectly evaluate as non-nil and route into
	// the Docker path. Mirrors the pattern documented in the Go FAQ
	// "Why is my nil error value not equal to nil?".
	if p != nil {
		h.provisioner = p
	}
	return h
}

// WithNamespaceCleanup wires the I5 hook (RFC #2728) so workspace
// purge can drop the plugin's `workspace:<id>` namespace. main.go
// passes a closure over plugin.DeleteNamespace; tests pass a stub.
// Nil-safe: omitting this leaves namespaceCleanupFn nil, which the
// purge path treats as a no-op.
func (h *WorkspaceHandler) WithNamespaceCleanup(fn func(ctx context.Context, workspaceID string)) *WorkspaceHandler {
	h.namespaceCleanupFn = fn
	return h
}

// SetCPProvisioner wires the control plane provisioner for SaaS tenants.
// Auto-activated when MOLECULE_ORG_ID is set (no manual config needed).
//
// Parameter is the CPProvisionerAPI interface (#1814) — production passes
// the *CPProvisioner from NewCPProvisioner; tests pass a stub.
func (h *WorkspaceHandler) SetCPProvisioner(cp provisioner.CPProvisionerAPI) {
	h.cpProv = cp
}

// SetEnvMutators wires a provisionhook.Registry into the handler. Plugins
// living in separate repos register on the same Registry instance during
// boot (see cmd/server/main.go) and main.go calls this setter once before
// router.Setup. Re-callable for tests but not safe under concurrent
// provisions — only invoke during single-threaded init.
func (h *WorkspaceHandler) SetEnvMutators(r *provisionhook.Registry) {
	h.envMutators = r
}

// TokenRegistry returns the provisionhook.Registry so the router can
// wire the GET /admin/github-installation-token handler without coupling
// to WorkspaceHandler's internals. Returns nil when no plugin has been
// registered (dev / self-hosted deployments without a GitHub App).
func (h *WorkspaceHandler) TokenRegistry() *provisionhook.Registry {
	return h.envMutators
}

// Create handles POST /workspaces
func (h *WorkspaceHandler) Create(c *gin.Context) {
	var payload models.CreateWorkspacePayload
	if err := c.ShouldBindJSON(&payload); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid workspace payload"})
		return
	}

	// #685/#688: validate field lengths and reject injection characters before
	// any DB or provisioner interaction.
	if err := validateWorkspaceFields(payload.Name, payload.Role, payload.Model, payload.Runtime); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid workspace fields"})
		return
	}

	id := uuid.New().String()
	awarenessNamespace := workspaceAwarenessNamespace(id)
	if payload.Tier == 0 {
		// SaaS-aware default. SaaS → T4 (full host access; each
		// workspace runs on its own sibling EC2 so the tier boundary
		// is a Docker resource limit on the only container present —
		// no neighbour to protect from). Self-hosted → T3 (read-write
		// workspace mount + Docker daemon access, most templates'
		// baseline). Lower tiers (T1 sandboxed, T2 standard) remain
		// explicit opt-ins for low-trust agents. Matches the canvas
		// CreateWorkspaceDialog defaults so the API and the UI agree.
		payload.Tier = h.DefaultTier()
	}

	// Detect runtime + default model from template config.yaml when the
	// caller omitted them. Must happen before DB insert so persisted
	// fields match the template's intent.
	//
	// Model default pre-fills the hermes-trap gap (PR #1714 + TemplatePalette
	// patch): any create path (canvas dialog, TemplatePalette, direct API)
	// that names a template but forgets a model slug now inherits the
	// template's `runtime_config.model` — without it, hermes-agent falls
	// back to its compiled-in Anthropic default and 401s when the user's
	// key is for a different provider. Non-hermes runtimes are unaffected
	// (the server still passes model through, they just don't use it).
	if payload.Template != "" && (payload.Runtime == "" || payload.Model == "") {
		// #226: payload.Template is attacker-controllable. resolveInsideRoot
		// rejects absolute paths and any ".." that escapes configsDir so the
		// provisioner can't be pointed at host directories.
		candidatePath, resolveErr := resolveInsideRoot(h.configsDir, payload.Template)
		if resolveErr != nil {
			log.Printf("Create: invalid template path %q: %v", payload.Template, resolveErr)
			c.JSON(http.StatusBadRequest, gin.H{"error": "invalid template"})
			return
		}
		cfgData, readErr := os.ReadFile(filepath.Join(candidatePath, "config.yaml"))
		if readErr != nil {
			log.Printf("Create: could not read config.yaml for template %q: %v", payload.Template, readErr)
		}
		// Two-pass line scanner: the old parser found top-level `runtime:`
		// by substring match on trimmed lines. We extend it to also find
		// the nested `runtime_config.model:` (new format) and top-level
		// `model:` (legacy format). A minimal state var tracks whether
		// we're inside the runtime_config block based on indentation.
		inRuntimeConfig := false
		for _, rawLine := range strings.Split(string(cfgData), "\n") {
			// Track indentation to detect block transitions.
			trimmed := strings.TrimLeft(rawLine, " \t")
			indented := len(rawLine) > len(trimmed)
			if !indented {
				// Left the runtime_config block (or never entered it).
				inRuntimeConfig = strings.HasPrefix(trimmed, "runtime_config:")
			}
			stripped := strings.TrimSpace(rawLine)
			switch {
			case payload.Runtime == "" && !indented && strings.HasPrefix(stripped, "runtime:") && !strings.HasPrefix(stripped, "runtime_config"):
				payload.Runtime = strings.TrimSpace(strings.TrimPrefix(stripped, "runtime:"))
			case payload.Model == "" && !indented && strings.HasPrefix(stripped, "model:"):
				// Legacy top-level `model:` — pre-runtime_config templates.
				payload.Model = strings.Trim(strings.TrimSpace(strings.TrimPrefix(stripped, "model:")), `"'`)
			case payload.Model == "" && indented && inRuntimeConfig && strings.HasPrefix(stripped, "model:"):
				// Nested `runtime_config.model:` — current format (hermes etc.).
				payload.Model = strings.Trim(strings.TrimSpace(strings.TrimPrefix(stripped, "model:")), `"'`)
			}
			if payload.Runtime != "" && payload.Model != "" {
				break
			}
		}
	}
	if payload.Runtime == "" {
		payload.Runtime = "langgraph"
	}

	ctx := c.Request.Context()

	// Convert empty role to NULL
	var role interface{}
	if payload.Role != "" {
		role = payload.Role
	}

	// Validate and convert workspace_dir
	var workspaceDir interface{}
	if payload.WorkspaceDir != "" {
		if err := validateWorkspaceDir(payload.WorkspaceDir); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "invalid workspace directory"})
			return
		}
		workspaceDir = payload.WorkspaceDir
	}

	// #65: validate workspace_access, default to "none".
	workspaceAccess := payload.WorkspaceAccess
	if workspaceAccess == "" {
		workspaceAccess = provisioner.WorkspaceAccessNone
	}
	if err := provisioner.ValidateWorkspaceAccess(workspaceAccess, payload.WorkspaceDir); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid workspace access"})
		return
	}

	// Begin a transaction so the workspace row and any initial secrets are
	// committed atomically.  A secret-encrypt or DB error rolls back the
	// workspace insert so we never leave a workspace row with missing secrets.

	// SSRF guard: validate workspace URL before starting any DB transaction.
	// registry.go:324 calls this same guard for agent self-registration;
	// the admin-create path must be covered too (core#212).
	// Must stay above BeginTx so the rejection path never touches the DB.
	if payload.URL != "" {
		if err := validateAgentURL(payload.URL); err != nil {
			log.Printf("Create: workspace URL rejected: %v", err)
			c.JSON(http.StatusBadRequest, gin.H{"error": "unsafe workspace URL: " + err.Error()})
			return
		}
	}

	tx, txErr := db.DB.BeginTx(ctx, nil)
	if txErr != nil {
		log.Printf("Create workspace: begin tx error: %v", txErr)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create workspace"})
		return
	}

	maxConcurrent := payload.MaxConcurrentTasks
	if maxConcurrent <= 0 {
		maxConcurrent = models.DefaultMaxConcurrentTasks
	}
	// delivery_mode: explicit payload value (validated below), else default
	// to push (the schema default + pre-#2339 behavior). Validated here, not
	// in workspace_provision.go, so a bad value fails the create cleanly
	// instead of mid-provision after side effects.
	deliveryMode := payload.DeliveryMode
	if deliveryMode == "" {
		deliveryMode = models.DeliveryModePush
	}
	if !models.IsValidDeliveryMode(deliveryMode) {
		tx.Rollback() //nolint:errcheck
		c.JSON(http.StatusBadRequest, gin.H{"error": "delivery_mode must be 'push' or 'poll'"})
		return
	}
	// Insert workspace with runtime + delivery_mode persisted in DB (inside transaction).
	//
	// Auto-suffix on (parent_id, name) collision via insertWorkspaceWithNameRetry:
	// the partial-unique index `workspaces_parent_name_uniq` (migration
	// 20260506000000) protects /org/import from TOCTOU duplicates, but the
	// pre-fix Canvas Create path bubbled the raw pq violation as a 500 on
	// double-click. Helper retries with " (2)", " (3)", … up to maxNameSuffix,
	// returns the actually-persisted name (which we MUST thread back into
	// payload + broadcast so the canvas displays what the DB has).
	const insertWorkspaceSQL = `
		INSERT INTO workspaces (id, name, role, tier, runtime, awareness_namespace, status, parent_id, workspace_dir, workspace_access, budget_limit, max_concurrent_tasks, delivery_mode)
		VALUES ($1, $2, $3, $4, $5, $6, 'provisioning', $7, $8, $9, $10, $11, $12)
	`
	insertArgs := []any{id, payload.Name, role, payload.Tier, payload.Runtime, awarenessNamespace, payload.ParentID, workspaceDir, workspaceAccess, payload.BudgetLimit, maxConcurrent, deliveryMode}
	persistedName, currentTx, err := insertWorkspaceWithNameRetry(
		ctx,
		tx,
		// Closure captures ctx so the retry tx uses the same request context;
		// nil opts mirrors the original BeginTx call above.
		func(ctx context.Context) (*sql.Tx, error) { return db.DB.BeginTx(ctx, nil) },
		payload.Name,
		1, // args[1] is name
		insertWorkspaceSQL,
		insertArgs,
	)
	if err != nil {
		if currentTx != nil {
			currentTx.Rollback() //nolint:errcheck
		}
		if errors.Is(err, errWorkspaceNameExhausted) {
			log.Printf("Create workspace: name suffix exhausted for base %q under parent %v", payload.Name, payload.ParentID)
			c.JSON(http.StatusConflict, gin.H{"error": "workspace name already in use; please pick a different name"})
			return
		}
		log.Printf("Create workspace error: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create workspace"})
		return
	}
	// Helper may have rolled back the original tx and returned a fresh one;
	// rebind so the remaining secrets-INSERT + Commit run on the live tx.
	tx = currentTx
	if persistedName != payload.Name {
		log.Printf("Create workspace %s: name collision auto-suffix %q -> %q", id, payload.Name, persistedName)
		payload.Name = persistedName
	}

	// Persist initial secrets from the create payload (inside same transaction).
	// nil/empty map is a no-op.  Any failure rolls back the workspace insert
	// so we never have a workspace row without its intended secrets.
	for k, v := range payload.Secrets {
		encrypted, encErr := crypto.Encrypt([]byte(v))
		if encErr != nil {
			tx.Rollback() //nolint:errcheck
			log.Printf("Create workspace %s: failed to encrypt secret %q: %v", id, k, encErr)
			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to encrypt secret: " + k})
			return
		}
		version := crypto.CurrentEncryptionVersion()
		if _, dbErr := tx.ExecContext(ctx, `
			INSERT INTO workspace_secrets (workspace_id, key, encrypted_value, encryption_version)
			VALUES ($1, $2, $3, $4)
			ON CONFLICT (workspace_id, key) DO UPDATE
				SET encrypted_value = $3, encryption_version = $4, updated_at = now()
		`, id, k, encrypted, version); dbErr != nil {
			tx.Rollback() //nolint:errcheck
			log.Printf("Create workspace %s: failed to persist secret %q: %v", id, k, dbErr)
			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to save secret: " + k})
			return
		}
	}

	if commitErr := tx.Commit(); commitErr != nil {
		log.Printf("Create workspace %s: transaction commit failed: %v", id, commitErr)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create workspace"})
		return
	}

	// Persist canvas-selected model + derived provider as workspace
	// secrets so they survive restart and are picked up by CP user-data
	// when regenerating /configs/config.yaml. Without this, the
	// applyRuntimeModelEnv fallback chain (workspace_provision.go)
	// cannot recover the user's choice on a Restart payload (which
	// rebuilds from the workspaces row, where there is no model column),
	// and hermes silently boots with the template-default model. See
	// failed-workspace 95ed3ff2 (2026-05-02): canvas POSTed
	// minimax/MiniMax-M2.7-highspeed, MODEL_PROVIDER was never written,
	// container fell through to nousresearch/hermes-4-70b, derive-
	// provider.sh produced the wrong provider, hermes gateway 401'd,
	// /health poll failed, molecule-runtime never registered.
	//
	// Both writes are non-fatal: a failure here logs and continues so
	// the workspace row stays consistent. The runtime can still boot
	// (with the template default) and a later Save+Restart will re-
	// persist via the SecretsHandler endpoints. The DB error path here
	// is rare (the same DB just committed a workspace row a microsecond
	// ago) so failing the create response would be unfriendly.
	if payload.Model != "" {
		if err := setModelSecret(ctx, id, payload.Model); err != nil {
			log.Printf("Create workspace %s: failed to persist MODEL_PROVIDER %q: %v (non-fatal)", id, payload.Model, err)
		}
		if derived := deriveProviderFromModelSlug(payload.Model); derived != "" {
			if err := setProviderSecret(ctx, id, derived); err != nil {
				log.Printf("Create workspace %s: failed to persist LLM_PROVIDER %q: %v (non-fatal)", id, derived, err)
			}
		}
	}

	// Insert canvas layout — non-fatal: workspace can be dragged into position later
	if _, err := db.DB.ExecContext(ctx, `
		INSERT INTO canvas_layouts (workspace_id, x, y) VALUES ($1, $2, $3)
	`, id, payload.Canvas.X, payload.Canvas.Y); err != nil {
		log.Printf("Create: canvas layout insert failed for %s (workspace will appear at 0,0): %v", id, err)
	}

	// Seed initial memories from the create payload (issue #1050).
	// Non-fatal: failures are logged but don't block workspace creation.
	seedInitialMemories(ctx, id, payload.InitialMemories, awarenessNamespace)

	// Broadcast provisioning event. Include `runtime` so the canvas can
	// populate the Runtime pill on the side panel immediately — without it
	// the node lives as "runtime: unknown" until something refetches the
	// workspace row (which nothing does during provisioning).
	h.broadcaster.RecordAndBroadcast(ctx, string(events.EventWorkspaceProvisioning), id, map[string]interface{}{
		"name":    payload.Name,
		"tier":    payload.Tier,
		"runtime": payload.Runtime,
	})

	// External workspaces: no container provisioning. Two shapes:
	//   (a) URL supplied up-front  — the operator already has their
	//       agent running somewhere reachable; we mark it online
	//       immediately. Legacy flow, preserved for callers that
	//       don't need the copy-this-snippet UX (org-import, etc.).
	//   (b) URL omitted             — the operator will install
	//       molecule-sdk-python or another A2A server later. We
	//       mint a workspace_auth_token now and return it alongside
	//       workspace_id + platform_url so the canvas UI can show
	//       one copy-paste connection snippet. Status is set to
	//       "awaiting_agent" — distinct from "provisioning" (which
	//       implies docker work in flight) so the canvas can render
	//       a "waiting for external agent to connect" state without
	//       tripping the provisioning-timeout UX.
	if payload.External || payload.Runtime == "external" {
		var connectionToken string
		if payload.URL != "" {
			// URL already validated by validateAgentURL above (before BeginTx).
			// Now persist it: the external URL is set after the workspace row
			// commits so that a failed URL UPDATE doesn't roll back the row.
			db.DB.ExecContext(ctx, `UPDATE workspaces SET url = $1, status = $2, runtime = 'external', updated_at = now() WHERE id = $3`, payload.URL, models.StatusOnline, id)
			if err := db.CacheURL(ctx, id, payload.URL); err != nil {
				log.Printf("External workspace: failed to cache URL for %s: %v", id, err)
			}
			h.broadcaster.RecordAndBroadcast(ctx, string(events.EventWorkspaceOnline), id, map[string]interface{}{
				"name": payload.Name, "external": true,
			})
		} else {
			// Pre-register flow: mint a token and park the workspace
			// in awaiting_agent. First POST /registry/register call
			// from the external agent (with this token + its URL)
			// flips the row to online.
			db.DB.ExecContext(ctx, `UPDATE workspaces SET status = $1, runtime = 'external', updated_at = now() WHERE id = $2`, models.StatusAwaitingAgent, id)
			tok, tokErr := wsauth.IssueToken(ctx, db.DB, id)
			if tokErr != nil {
				log.Printf("External workspace %s: token issuance failed: %v", id, tokErr)
				// Non-fatal — the workspace row still exists; the
				// operator can call POST /workspaces/:id/external/rotate
				// later to recover. Return a 201 with a hint instead of
				// 500'ing a partial-success write.
			} else {
				connectionToken = tok
			}
			h.broadcaster.RecordAndBroadcast(ctx, string(events.EventWorkspaceAwaitingAgent), id, map[string]interface{}{
				"name": payload.Name, "external": true,
			})
		}
		log.Printf("Created external workspace %s (%s) url=%q awaiting=%v",
			payload.Name, id, payload.URL, payload.URL == "")
		resp := gin.H{
			"id":       id,
			"external": true,
		}
		if payload.URL != "" {
			resp["status"] = "online"
		} else {
			resp["status"] = "awaiting_agent"
			// Connection snippet payload. Returned ONCE on create —
			// the token is not recoverable from any later read.
			//
			// Payload assembly + per-snippet template stamping lives
			// in BuildExternalConnectionPayload (external_connection.go)
			// so the rotate + re-show endpoints emit byte-identical
			// shape. Adding a new snippet means adding it once there;
			// all three callers pick it up automatically.
			resp["connection"] = BuildExternalConnectionPayload(
				externalPlatformURL(c), id, connectionToken,
			)
		}
		c.JSON(http.StatusCreated, resp)
		return
	}

	// Resolve template config — needed for both Docker provisioning and
	// config-only persistence (tenant SaaS without Docker).
	var templatePath string
	var configFiles map[string][]byte
	if payload.Template != "" {
		candidatePath, resolveErr := resolveInsideRoot(h.configsDir, payload.Template)
		if resolveErr != nil {
			log.Printf("Create provision: rejecting template %q: %v", payload.Template, resolveErr)
			return
		}
		if _, err := os.Stat(candidatePath); err == nil {
			templatePath = candidatePath
		} else {
			log.Printf("Create: template %q not found, falling back for %s", payload.Template, payload.Name)
			safeRuntime := sanitizeRuntime(payload.Runtime)
			runtimeDefault := filepath.Join(h.configsDir, safeRuntime+"-default")
			if _, err := os.Stat(runtimeDefault); err == nil {
				templatePath = runtimeDefault
			} else {
				configFiles = h.ensureDefaultConfig(id, payload)
			}
		}
	} else {
		configFiles = h.ensureDefaultConfig(id, payload)
	}

	// Auto-provision — pick backend: control plane (SaaS) or Docker (self-hosted).
	// Routing AND the no-backend mark-failed path are both inside
	// provisionWorkspaceAuto (single source of truth). The Create-specific
	// extra is the workspace_config UPSERT below: when no backend is
	// wired, Auto marks the row failed but doesn't persist the bare
	// runtime/model/tier as JSON — the Config tab needs that to render
	// even on failed workspaces, so Create owns this Create-only side
	// effect rather than coupling Auto to a UI concern.
	if !h.provisionWorkspaceAuto(id, templatePath, configFiles, payload) {
		cfgJSON := fmt.Sprintf(`{"name":%q,"runtime":%q,"tier":%d,"template":%q}`,
			payload.Name, payload.Runtime, payload.Tier, payload.Template)
		if _, err := db.DB.ExecContext(ctx, `
			INSERT INTO workspace_config (workspace_id, data) VALUES ($1, $2::jsonb)
			ON CONFLICT (workspace_id) DO UPDATE SET data = $2::jsonb
		`, id, cfgJSON); err != nil {
			log.Printf("Create: workspace_config persist failed for %s: %v", id, err)
		}
	}

	c.JSON(http.StatusCreated, gin.H{
		"id":                  id,
		"status":              "provisioning",
		"awareness_namespace": awarenessNamespace,
		"workspace_access":    workspaceAccess,
	})
}

// addProvisionTimeoutMs decorates a workspace response map with the
// per-runtime provision-timeout override (#2054 phase 2) when one is
// declared in the runtime's template manifest. No-op when the runtime
// has no declared timeout — the canvas-side resolver falls through to
// its runtime-profile default.
func (h *WorkspaceHandler) addProvisionTimeoutMs(ws map[string]interface{}, runtime string) {
	if secs := h.ProvisionTimeoutSecondsForRuntime(runtime); secs > 0 {
		ws["provision_timeout_ms"] = secs * 1000
	}
}

// ProvisionTimeoutSecondsForRuntime returns the per-runtime provision
// timeout in seconds when a template's config.yaml declared
// `runtime_config.provision_timeout_seconds`, else 0 ("no override —
// caller falls through to its own default").
//
// Exported so cmd/server/main.go can pass it to
// registry.StartProvisioningTimeoutSweep — same template-manifest value
// the canvas reads via addProvisionTimeoutMs. Without this, the
// sweeper killed claude-code at 10 min while the manifest declared a
// longer window, and a user saw the "Retry" UI before their image
// pull even finished. See registry.RuntimeTimeoutLookup for the
// resolution order.
func (h *WorkspaceHandler) ProvisionTimeoutSecondsForRuntime(runtime string) int {
	return h.provisionTimeouts.get(h.configsDir, runtime)
}

// scanWorkspaceRow is a helper to scan workspace+layout rows into a clean JSON map.
func scanWorkspaceRow(rows interface {
	Scan(dest ...interface{}) error
}) (map[string]interface{}, error) {
	var id, name, role, status, url, sampleError, currentTask, runtime, workspaceDir string
	var tier, activeTasks, maxConcurrentTasks, uptimeSeconds int
	var errorRate, x, y float64
	var collapsed bool
	var parentID *string
	var agentCard []byte
	var budgetLimit sql.NullInt64
	var monthlySpend int64

	err := rows.Scan(&id, &name, &role, &tier, &status, &agentCard, &url,
		&parentID, &activeTasks, &maxConcurrentTasks, &errorRate, &sampleError, &uptimeSeconds,
		&currentTask, &runtime, &workspaceDir, &x, &y, &collapsed,
		&budgetLimit, &monthlySpend)
	if err != nil {
		return nil, err
	}

	ws := map[string]interface{}{
		"id":                   id,
		"name":                 name,
		"tier":                 tier,
		"status":               status,
		"url":                  url,
		"parent_id":            parentID,
		"active_tasks":         activeTasks,
		"max_concurrent_tasks": maxConcurrentTasks,
		"last_error_rate":      errorRate,
		"last_sample_error":    sampleError,
		"uptime_seconds":       uptimeSeconds,
		"current_task":         currentTask,
		"runtime":              runtime,
		"workspace_dir":        nilIfEmpty(workspaceDir),
		"monthly_spend":        monthlySpend,
		"x":                    x,
		"y":                    y,
		"collapsed":            collapsed,
	}

	// budget_limit: nil when no limit set, int64 otherwise
	if budgetLimit.Valid {
		ws["budget_limit"] = budgetLimit.Int64
	} else {
		ws["budget_limit"] = nil
	}

	// Only include non-empty values
	if role != "" {
		ws["role"] = role
	} else {
		ws["role"] = nil
	}

	// Parse agent_card as raw JSON
	if len(agentCard) > 0 && string(agentCard) != "null" {
		ws["agent_card"] = json.RawMessage(agentCard)
	} else {
		ws["agent_card"] = nil
	}

	return ws, nil
}

const workspaceListQuery = `
	SELECT w.id, w.name, COALESCE(w.role, ''), w.tier, w.status,
		   COALESCE(w.agent_card, 'null'::jsonb), COALESCE(w.url, ''),
		   w.parent_id, w.active_tasks, COALESCE(w.max_concurrent_tasks, 1),
		   w.last_error_rate,
		   COALESCE(w.last_sample_error, ''), w.uptime_seconds,
		   COALESCE(w.current_task, ''), COALESCE(w.runtime, 'langgraph'),
		   COALESCE(w.workspace_dir, ''),
		   COALESCE(cl.x, 0), COALESCE(cl.y, 0), COALESCE(cl.collapsed, false),
		   w.budget_limit, COALESCE(w.monthly_spend, 0)
	FROM workspaces w
	LEFT JOIN canvas_layouts cl ON cl.workspace_id = w.id
	WHERE w.status != 'removed'
	ORDER BY w.created_at`

// List handles GET /workspaces
func (h *WorkspaceHandler) List(c *gin.Context) {
	rows, err := db.DB.QueryContext(c.Request.Context(), workspaceListQuery)
	if err != nil {
		log.Printf("List workspaces error: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "query failed"})
		return
	}
	defer rows.Close()

	workspaces := make([]map[string]interface{}, 0)
	for rows.Next() {
		ws, err := scanWorkspaceRow(rows)
		if err != nil {
			log.Printf("List scan error: %v", err)
			continue
		}
		// #2054 phase 2: surface per-runtime provision-timeout for
		// canvas's ProvisioningTimeout banner. Decorating per-row
		// (vs map-once-and-reuse) keeps the helper self-contained;
		// the cache hit is sub-microsecond.
		if rt, _ := ws["runtime"].(string); rt != "" {
			h.addProvisionTimeoutMs(ws, rt)
		}
		workspaces = append(workspaces, ws)
	}
	if err := rows.Err(); err != nil {
		log.Printf("List rows error: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "query iteration failed"})
		return
	}

	c.JSON(http.StatusOK, workspaces)
}

// Get handles GET /workspaces/:id
func (h *WorkspaceHandler) Get(c *gin.Context) {
	id := c.Param("id")

	// #687: reject non-UUID IDs before hitting the DB.
	if err := validateWorkspaceID(id); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid workspace ID"})
		return
	}

	row := db.DB.QueryRowContext(c.Request.Context(), `
		SELECT w.id, w.name, COALESCE(w.role, ''), w.tier, w.status,
			   COALESCE(w.agent_card, 'null'::jsonb), COALESCE(w.url, ''),
			   w.parent_id, w.active_tasks, COALESCE(w.max_concurrent_tasks, 1),
			   w.last_error_rate,
			   COALESCE(w.last_sample_error, ''), w.uptime_seconds,
			   COALESCE(w.current_task, ''), COALESCE(w.runtime, 'langgraph'),
			   COALESCE(w.workspace_dir, ''),
			   COALESCE(cl.x, 0), COALESCE(cl.y, 0), COALESCE(cl.collapsed, false),
			   w.budget_limit, COALESCE(w.monthly_spend, 0)
		FROM workspaces w
		LEFT JOIN canvas_layouts cl ON cl.workspace_id = w.id
		WHERE w.id = $1
	`, id)

	ws, err := scanWorkspaceRow(row)
	if err == sql.ErrNoRows {
		c.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})
		return
	}
	if err != nil {
		log.Printf("Get workspace error: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "query failed"})
		return
	}

	// #2429: workspaces with status='removed' return 410 Gone (not 200)
	// so callers fail loudly at startup instead of after 60s of revoked-
	// token heartbeats. The audit-trail consumers that need the body of
	// a removed workspace opt in via ?include_removed=true.
	//
	// Why a query param and not a header: cheap to set in curl/canvas
	// fetch alike, visible in access logs, and works without coupling
	// to content negotiation.
	if status, _ := ws["status"].(string); status == string(models.StatusRemoved) {
		if c.Query("include_removed") != "true" {
			// Best-effort fetch of the removal timestamp. If the row was
			// deleted (or some transient DB error fired) between the
			// scanWorkspaceRow above and this follow-up SELECT,
			// removedAt stays as Go's zero time. Emit `null` in that
			// case rather than the misleading `0001-01-01T00:00:00Z`
			// the client would otherwise see — the actionable signal
			// is the 410 + hint, not the timestamp.
			var removedAt time.Time
			_ = db.DB.QueryRowContext(c.Request.Context(),
				`SELECT updated_at FROM workspaces WHERE id = $1`, id,
			).Scan(&removedAt)
			body := gin.H{
				"error": "workspace removed",
				"id":    id,
				"hint":  "Regenerate workspace + token from the canvas → Tokens tab",
			}
			if removedAt.IsZero() {
				body["removed_at"] = nil
			} else {
				body["removed_at"] = removedAt
			}
			c.JSON(http.StatusGone, body)
			return
		}
	}

	// Strip sensitive fields — GET /workspaces/:id is on the open router.
	// Any caller with a valid UUID would otherwise read operational data.
	delete(ws, "budget_limit")
	delete(ws, "monthly_spend")
	delete(ws, "current_task")      // operational surveillance risk (#955)
	delete(ws, "last_sample_error") // internal error details
	delete(ws, "workspace_dir")     // host path disclosure

	// #817: expose last_outbound_at so orchestrators can detect silent
	// workspaces. Non-sensitive — just a timestamp of the most recent
	// outbound A2A. Null if the workspace has never sent anything.
	var lastOutbound sql.NullTime
	if err := db.DB.QueryRowContext(c.Request.Context(),
		`SELECT last_outbound_at FROM workspaces WHERE id = $1`, id,
	).Scan(&lastOutbound); err == nil && lastOutbound.Valid {
		ws["last_outbound_at"] = lastOutbound.Time
	} else {
		ws["last_outbound_at"] = nil
	}

	// #2054 phase 2: per-runtime provision-timeout for canvas's
	// ProvisioningTimeout banner.
	if rt, _ := ws["runtime"].(string); rt != "" {
		h.addProvisionTimeoutMs(ws, rt)
	}

	c.JSON(http.StatusOK, ws)
}