package festival_test

import (
	"context"
	"fmt"

	"git.golem15.com/golem15/summercms/modules/festival"
)

// PostPublished is the event the acme.blog plugin fires after a post goes live.
type PostPublished struct {
	Title string
}

func ExampleBus_Fire() {
	bus := festival.New() // in a plugin, use app.Events

	// acme.search and acme.notify extend acme.blog from their Boot steps.
	bus.Listen("acme.search", func(ctx context.Context, e PostPublished) error {
		fmt.Println("index", e.Title)
		return nil
	})
	bus.ListenPriority("acme.notify", 10, func(ctx context.Context, e PostPublished) error {
		fmt.Println("notify subscribers of", e.Title)
		return nil
	})

	// acme.blog fires the event; higher priorities run first.
	if err := bus.Fire(context.Background(), PostPublished{Title: "Hello"}); err != nil {
		fmt.Println(err)
	}
	// Output:
	// notify subscribers of Hello
	// index Hello
}

// PostFormExtended gathers extra fields other plugins add to the post form.
type PostFormExtended struct {
	fields map[string]any
}

func (e *PostFormExtended) Collected() map[string]any { return e.fields }

func ExampleBus_Collect() {
	bus := festival.New()
	bus.Listen("acme.seo", func(ctx context.Context, e *PostFormExtended) error {
		e.fields = map[string]any{"meta_title": "text"}
		return nil
	})
	bus.Listen("acme.gallery", func(ctx context.Context, e *PostFormExtended) error {
		e.fields = map[string]any{"cover": "fileupload"}
		return nil
	})

	fields, err := bus.Collect(context.Background(), &PostFormExtended{})
	fmt.Println(fields, err)
	// Output: map[cover:fileupload meta_title:text] <nil>
}

// SlugResolving asks plugins to resolve a URL slug; the first one that
// knows it handles the event.
type SlugResolving struct {
	Slug  string
	Found string
}

func (e *SlugResolving) IsHandled() bool { return e.Found != "" }

func ExampleBus_UntilHandled() {
	bus := festival.New()
	bus.ListenPriority("acme.pages", 10, func(ctx context.Context, e *SlugResolving) error {
		if e.Slug == "about" {
			e.Found = "page"
		}
		return nil
	})
	bus.Listen("acme.blog", func(ctx context.Context, e *SlugResolving) error {
		fmt.Println("acme.blog asked for", e.Slug)
		e.Found = "post"
		return nil
	})

	for _, slug := range []string{"about", "hello-world"} {
		e := &SlugResolving{Slug: slug}
		handled, err := bus.UntilHandled(context.Background(), e)
		fmt.Println(slug, handled, e.Found, err)
	}
	// Output:
	// about true page <nil>
	// acme.blog asked for hello-world
	// hello-world true post <nil>
}