// SPDX-License-Identifier: EUPL-1.2

package api

import (
	core "dappco.re/go/core"
	"gopkg.in/yaml.v3"
)

// ExportSpec generates the OpenAPI spec and writes it to a core.Fs path.
// Format must be "json" or "yaml".
func ExportSpec(path, format string, builder *SpecBuilder, groups []RouteGroup) core.Result {
	r := builder.Build(groups)
	if !r.OK {
		return r
	}
	data := r.Value.([]byte)

	switch format {
	case "json":
		return (&core.Fs{}).NewUnrestricted().Write(path, string(data))
	case "yaml":
		var obj any
		if ur := core.JSONUnmarshal(data, &obj); !ur.OK {
			return core.Result{Value: core.E("ExportSpec", "unmarshal spec", nil), OK: false}
		}
		b := core.NewBuilder()
		enc := yaml.NewEncoder(b)
		enc.SetIndent(2)
		if err := enc.Encode(obj); err != nil {
			return core.Result{Value: core.E("ExportSpec", "encode yaml", err), OK: false}
		}
		enc.Close()
		return (&core.Fs{}).NewUnrestricted().Write(path, b.String())
	default:
		return core.Result{Value: core.E("ExportSpec", core.Concat("unsupported format: ", format), nil), OK: false}
	}
}