package manifests

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/samber/lo"
	"github.com/sirupsen/logrus"
	"gorm.io/gorm"
	"io"
	"net/http"
	"nf-repo/internal/interfaces"
	"nf-repo/internal/model"
	"nf-repo/internal/util/rerr"
	"nf-repo/internal/util/tools"
)

type PackageManifest struct {
	Id        uint64 `json:"id" gorm:"primaryKey;column:id"`
	CreatedAt int64  `json:"created_at" gorm:"column:created_at;autoCreateTime:milli"`
	UpdatedAt int64  `json:"updated_at" gorm:"column:updated_at;autoUpdateTime:milli"`

	Repo        string `json:"repo" gorm:"uniqueIndex:repo_tag_idx;column:repo"`
	Target      string `json:"target" gorm:"uniqueIndex:repo_tag_idx;column:target"`
	Digest      string `json:"digest" gorm:"unique;column:digest"`
	ContentType string `json:"content_type" gorm:"column:content_type"`
	Content     []byte `json:"content" gorm:"column:content;type:bytes"`
}

type dbManifests struct {
	db interfaces.Database
}

func (m *dbManifests) Get(ctx context.Context, repo string, target string) (io.ReadCloser, string, *rerr.RepositoryError) {
	var (
		err error
		pm  = new(PackageManifest)
		h   model.Hash
		tx  = m.db.TX(tools.Timeout(5)).Model(pm)
	)

	if h, err = model.NewHash(target); err == nil {
		tx = tx.Where("digest", h.String())
	} else {
		tx = tx.Where("repo", repo).
			Where("target", target)
	}

	if err = tx.
		Take(pm).
		Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, "", &rerr.RepositoryError{
				Status:  http.StatusNotFound,
				Code:    "NAME_UNKNOWN",
				Message: fmt.Sprintf("Unknown name: %s@%s", repo, target),
			}
		}

		return nil, "", rerr.ErrInternal(err)
	}

	return io.NopCloser(bytes.NewReader(pm.Content)), pm.ContentType, nil
}

func (m *dbManifests) Put(ctx context.Context, repo string, target string, digest string, mf *model.Manifest) *rerr.RepositoryError {
	var (
		err error
		pm  = &PackageManifest{
			Repo:        repo,
			Target:      target,
			Digest:      digest,
			ContentType: mf.ContentType,
			Content:     mf.Blob,
		}
	)

	// todo on conflict
	if err = m.db.TX(tools.Timeout(5)).Create(pm).Error; err == nil {
		return nil
	}

	logrus.
		WithField("path", "dbManifests.Put.Create").
		WithField("err", err.Error()).
		Trace()

	if err = m.db.TX(tools.Timeout(5)).Model(&PackageManifest{}).
		Where("(repo = ? AND target = ?) OR (digest = ?)", repo, target, digest).
		Updates(map[string]any{
			"repo":         repo,
			"target":       target,
			"digest":       digest,
			"content_type": mf.ContentType,
			"content":      mf.Blob,
		}).
		Error; err != nil {
		logrus.
			WithField("path", "dbManifests.Put.Updates").
			WithField("err", err.Error()).
			Debug()
		return rerr.ErrInternal(err)
	}

	return nil
}

func (m *dbManifests) Delete(ctx context.Context, repo string, target string) *rerr.RepositoryError {
	var (
		err error
	)

	if err = m.db.TX(tools.Timeout(5)).
		Where("repo", repo).
		Where("target", target).
		Delete(&PackageManifest{}).
		Error; err != nil {
		return rerr.ErrInternal(err)
	}

	return nil
}

func (m *dbManifests) Catelog(ctx context.Context, limit int, last int) (*model.Catalog, *rerr.RepositoryError) {
	var (
		err  error
		list = make([]*PackageManifest, 0)
	)

	if err = m.db.TX(tools.Timeout(5)).Model(&PackageManifest{}).
		Order("updated_at").
		Offset(last).
		Limit(limit).
		Find(&list).
		Error; err != nil {
		return nil, rerr.ErrInternal(err)
	}

	return &model.Catalog{
		Repos: lo.Map(list, func(item *PackageManifest, index int) string {
			return item.Repo
		}),
	}, nil
}

func (m *dbManifests) Tags(ctx context.Context, repo string, limit, last int) (*model.Tag, *rerr.RepositoryError) {
	var (
		err  error
		list = make([]*PackageManifest, 0)
	)

	if err = m.db.TX(tools.Timeout(5)).Model(&PackageManifest{}).
		Where("repo", repo).
		Order("updated_at").
		Offset(last).
		Limit(limit).
		Find(&list).
		Error; err != nil {
		return nil, rerr.ErrInternal(err)
	}

	return &model.Tag{
		Name: repo,
		Tags: lo.Map(list, func(item *PackageManifest, index int) string {
			return item.Target
		}),
	}, nil
}

func (m *dbManifests) Referrers(ctx context.Context, repo string, target string) (*model.IndexManifest, *rerr.RepositoryError) {
	var (
		err      error
		pm       = new(PackageManifest)
		manifest = &model.IndexManifest{}
		tx       = m.db.TX(tools.Timeout(5)).Model(pm)
	)

	h, err := model.NewHash(target)
	if err != nil {
		tx = tx.Where("repo", repo).Where("digest", h.String())
	} else {
		tx = tx.Where("repo", repo).Where("target", target)
	}

	if err = m.db.TX(tools.Timeout(5)).Model(pm).
		Take(pm).
		Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, &rerr.RepositoryError{
				Status:  http.StatusNotFound,
				Code:    "NAME_UNKNOWN",
				Message: fmt.Sprintf("Unknown name: %s@%s", repo, target),
			}
		}

		logrus.
			WithField("path", "dbManifests.Referrers.Take").
			WithField("repo", repo).
			WithField("target", target).
			WithField("err", err.Error()).
			Debug()

		return nil, rerr.ErrInternal(err)
	}

	if err = json.Unmarshal(pm.Content, manifest); err != nil {
		logrus.
			WithField("path", "dbManifests.Referrers.Unmarshal").
			WithField("repo", repo).
			WithField("target", target).
			WithField("err", err.Error()).
			Debug()
		return nil, rerr.ErrInternal(err)
	}

	return manifest, nil
}

func NewManifestDBHandler(tx interfaces.Database) interfaces.ManifestHandler {
	var (
		err error
	)

	if err = tx.TX(tools.Timeout(5)).AutoMigrate(&PackageManifest{}); err != nil {
		logrus.
			WithField("path", "NewManifestDBHandler").
			WithField("method", "AutoMigrate").
			Panic(err)
	}

	return &dbManifests{db: tx}
}