package publisher

import (
	"context"
	"log"
	"os"

	"emperror.dev/errors"
	"github.com/go-openapi/runtime"
	"github.com/go-openapi/strfmt"
	"github.com/netlify/open-api/v2/go/porcelain"
	netlify_ctx "github.com/netlify/open-api/v2/go/porcelain/context"
	"lmika.dev/lmika/weiro/layouts/simplecss"
	"lmika.dev/lmika/weiro/models"
	"lmika.dev/lmika/weiro/models/pubmodel"
	"lmika.dev/lmika/weiro/providers/db"
	"lmika.dev/lmika/weiro/providers/sitebuilder"
)

type Publisher struct {
	db *db.Provider
}

func New(db *db.Provider) *Publisher {
	return &Publisher{
		db: db,
	}
}

func (p *Publisher) Publish(ctx context.Context, siteID int64) error {
	// Fetch site, ensure user is owner
	site, err := p.db.SelectSiteByID(ctx, siteID)
	if err != nil {
		return err
	}

	user, ok := models.GetUser(ctx)
	if !ok {
		return models.UserRequiredError
	} else if user.ID != site.OwnerID {
		return models.PermissionError
	}

	targets, err := p.db.SelectPublishTargetsOfSite(ctx, siteID)
	if err != nil {
		return err
	}

	// Fetch all content of site
	posts, err := p.db.SelectPostsOfSite(ctx, siteID)
	if err != nil {
		return err
	}

	for _, target := range targets {
		pubSite := pubmodel.Site{
			Site:    site,
			Posts:   posts,
			BaseURL: target.BaseURL,
		}

		if err := p.publishSite(ctx, pubSite, target); err != nil {
			return err
		}
	}

	return nil
}

func (p *Publisher) publishSite(ctx context.Context, pubSite pubmodel.Site, target models.SitePublishTarget) error {
	sb, err := sitebuilder.New(pubSite, sitebuilder.Options{
		BasePosts:   "/posts",
		TemplatesFS: simplecss.FS,
	})
	if err != nil {
		return err
	}

	switch target.TargetType {
	case "localfs":
		log.Printf("Building site at %s", target.TargetRef)
		return sb.BuildSite(target.TargetRef)
	case "netlify":
		return func() error {
			tmpDir, err := os.MkdirTemp("", "weiro-publish")
			if err != nil {
				return err
			}
			defer os.RemoveAll(tmpDir)

			if err := sb.BuildSite(tmpDir); err != nil {
				return err
			}

			ctx = netlify_ctx.WithAuthInfo(ctx, runtime.ClientAuthInfoWriterFunc(func(r runtime.ClientRequest, _ strfmt.Registry) error {
				return r.SetHeaderParam("Authorization", "Bearer "+target.TargetKey)
			}))

			client := porcelain.Default
			_, err = client.DeploySite(ctx, porcelain.DeployOptions{
				SiteID: target.TargetRef,
				Dir:    tmpDir,
			})
			return err
		}()
	}

	return errors.New("unknown target type")
}