package attach_test

import (
	"bytes"
	"context"
	"fmt"
	"image"
	"image/jpeg"
	"os"

	"git.golem15.com/golem15/summercms/modules/compass"
	"git.golem15.com/golem15/summercms/modules/lagoon/attach"
)

// Post owns attachments. MorphName is the attachment_type value its rows
// carry: the PHP class name, so rows copied from WinterCMS keep matching.
type Post struct {
	ID uint
}

func (Post) MorphName() string { return `Acme\Blog\Models\Post` }

func ExampleFile_Thumb() {
	ctx := context.Background()
	dir, err := os.MkdirTemp("", "acme-config")
	if err != nil {
		fmt.Println(err)
		return
	}
	defer os.RemoveAll(dir)

	// storage.uploads.bucket_url is a file:// URL in production; mem:// keeps
	// the example in memory.
	cfg, err := compass.Open(compass.Options{Dir: dir, Env: "development", Environ: []string{}})
	if err != nil {
		fmt.Println(err)
		return
	}
	_ = cfg.Set("storage.uploads.bucket_url", "mem://")
	bucket, err := attach.OpenBucket(ctx, cfg)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer bucket.Close()

	// The system_files row of a post's cover image.
	var owner attach.Owner = Post{ID: 1}
	f := attach.File{
		ID:             7,
		DiskName:       "5f1d0c2e9a7b4c3d8e6f.jpg",
		FileName:       "cover.jpg",
		ContentType:    "image/jpeg",
		Field:          "cover",
		AttachmentType: owner.MorphName(),
		AttachmentID:   "1",
	}

	// The original is stored under its partitioned WinterCMS key.
	var img bytes.Buffer
	if err := jpeg.Encode(&img, image.NewRGBA(image.Rect(0, 0, 640, 480)), nil); err != nil {
		fmt.Println(err)
		return
	}
	if err := bucket.WriteAll(ctx, attach.BlobKey(f.DiskName), img.Bytes(), nil); err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(attach.BlobKey(f.DiskName))

	// A thumbnail is generated on first use and reused afterwards.
	url, err := f.Thumb(ctx, bucket, 200, 200, "crop")
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(url)
	// Output:
	// 5f1/d0c/2e9/5f1d0c2e9a7b4c3d8e6f.jpg
	// /storage/uploads/5f1/d0c/2e9/thumb_7_200_200_0_0_crop.jpg
}