package platform

import (
	"context"
	"net/http"
	"time"
)

func (s *service) canvasCapabilities(w http.ResponseWriter, r *http.Request, project, account string) error {
	if r.Method != http.MethodGet {
		reject(w, 405, "method_not_allowed")
		return nil
	}
	tx, err := s.db.BeginTx(r.Context(), nil)
	if err != nil {
		return err
	}
	defer tx.Rollback()
	kind, _, err := lockMaterial(r.Context(), tx, project, r.PathValue("workspace"), r.PathValue("material"), account)
	if err != nil {
		return err
	}
	if kind != "board" {
		reject(w, 400, "invalid_material")
		return nil
	}
	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
	defer cancel()
	models, modelErr := s.canvasAI.Models(ctx)
	textAvailable, imageAvailable := false, false
	if modelErr == nil {
		for _, model := range models {
			if model.Available {
				textAvailable = textAvailable || canvasModelSupports(model, "text")
				imageAvailable = imageAvailable || canvasModelSupports(model, "image")
			}
		}
	}
	ai := response{"available": textAvailable || imageAvailable, "text": textAvailable, "image": imageAvailable}
	if modelErr != nil {
		ai["unavailable_reason"] = "codex_unavailable"
	}
	reply(w, 200, response{
		"contract_version":          "canvas-v2-2026-11-06",
		"supported_schema_versions": []int{1, 2},
		"edge_features":             response{"appearance": true, "markers": true, "bezier_chain": true, "animation_configuration": true, "execution_events": true},
		"subgraphs":                 response{"create": true, "migrate": true, "undo": true, "members": true, "dissolve": true},
		"ai":                        ai,
		"limits":                    response{"max_depth": 8, "max_nodes": 500, "max_edges": 2000, "max_frame_ports": 4000, "max_curve_knots": 64, "max_snapshot_bytes": canvasLimit, "max_active_tasks": 128, "max_run_steps": 64, "max_execution_depth": 32, "max_input_images": 4, "max_input_image_bytes": 20 << 20, "max_coordinate": 1000000},
		"retention":                 response{"idempotency_min_seconds": 86400, "undo_receipt_seconds": 604800},
	})
	return nil
}