package platform

import (
	"encoding/json"
	"strings"
)

func validCanvasAI(value any, kind string) bool {
	if !canvasChoice(kind, "text", "script", "plain-text", "image", "plain-image") {
		return false
	}
	ai, ok := value.(map[string]any)
	if !ok || !canvasFields(ai, "enabled", "modelId", "prompt", "propagate", "parameters") {
		return false
	}
	for key, value := range ai {
		switch key {
		case "enabled", "propagate":
			if _, ok := value.(bool); !ok {
				return false
			}
		case "modelId":
			id, ok := value.(string)
			if !ok || len(id) == 0 || len(id) > 256 || strings.TrimSpace(id) != id {
				return false
			}
		case "prompt":
			if !canvasString(value, 16000) {
				return false
			}
		case "parameters":
			params, ok := value.(map[string]any)
			if !ok {
				return false
			}
			raw, err := json.Marshal(params)
			if err != nil || len(raw) > 16<<10 {
				return false
			}
		}
	}
	return true
}

// Fingerprints exclude geometry and visual styles so a result can be applied
// after a concurrent drag. Content/configuration edits invalidate the result.
func canvasTargetFingerprint(board, node string, data map[string]any) string {
	target := map[string]any{"board_id": board, "node_id": node, "kind": data["kind"], "ai": data["ai"]}
	if canvasChoice(data["kind"], "image", "plain-image") {
		target["src"] = data["src"]
		target["assetId"] = data["assetId"]
	} else {
		target["text"] = data["text"]
	}
	return payloadDigest(target)
}