package api

import (
	"context"
	"errors"
	"net/http"

	"git.golem15.com/golem15/sm-seo-plugin/classes"
)

// GetGraphInput is the query of GET /_seo/api/v1/graph.
type GetGraphInput struct {
	URL    string  `json:"url" query:"url" jsonschema:"the page: a path such as /blog/post or an absolute URL of the site"`
	Schema *string `json:"schema,omitempty" query:"schema" jsonschema:"an unsaved structured data value (the seo_set_url_seo schema string) to preview instead of the stored one; omitted: the stored value"`
}

// Graph serves GET /_seo/api/v1/graph?url=&schema= (D-46, D-10): the
// JSON-LD @graph the resolve answer of the URL carries, built with the
// given unsaved schema value when sent, and every node with its missing
// required and recommended properties (rules false for a type Google has
// no rules for). It answers {locale, url, graph, nodes}; url and graph are
// null for an address that is not an ok page. 422 for a URL that is not a
// path or http(s) URL, or for a schema value the SEO tab would refuse.
func Graph(service func() *classes.Service) http.HandlerFunc {
	return manage(service, func(ctx context.Context, svc *classes.Service, r *http.Request) (int, any, error) {
		q := r.URL.Query()
		var override *string
		if q.Has("schema") {
			v := q.Get("schema")
			override = &v
		}
		answer, res, err := svc.GraphOfURL(ctx, q.Get("url"), override)
		if errors.Is(err, classes.ErrBadURL) {
			return 0, nil, Fail(http.StatusUnprocessableEntity, err.Error())
		}
		if err != nil {
			return 0, nil, err
		}
		if override != nil && res.TypeKey != "" {
			if typ, ok := svc.Registry().ContentType(res.TypeKey); ok && typ.Content != nil {
				if err := svc.CheckSchema(ctx, typ.Content.Kind, res.TypeKey, res.RecordID, *override); err != nil {
					return 0, nil, err
				}
			}
		}
		return http.StatusOK, answer, nil
	})
}