package service

import (
	"context"
	"errors"
	"fmt"
	"net/url"
	"octopus/internal/dal"
	"octopus/internal/dal/model"
	"octopus/internal/dal/query"
	"octopus/internal/schema"
	"time"

	"github.com/casdoor/casdoor-go-sdk/casdoorsdk"
	"github.com/rs/xid"
	"gorm.io/gen/field"
	"gorm.io/gorm"
)

func ListDocs(ctx context.Context, auth *casdoorsdk.User, param *schema.ListDocQuery) ([]*model.Doc, int64, error) {
	base := query.Doc.
		Where(query.Doc.OrgID.Eq(auth.Owner)).
		Preload(query.Doc.Folder)
	if param.FolderIDs != nil {
		base = base.Where(query.Doc.FolderID.In(*param.FolderIDs...))
	}
	if orders := param.GetOrderByFields(query.Doc); len(orders) != 0 {
		base = base.Order(orders...)
	}
	return base.FindByPage(param.GetOffset(), param.GetLimit())
}

func CreateDoc(ctx context.Context, auth *casdoorsdk.User, param *schema.CreateDoc) (*model.Doc, error) {
	storage := dal.GetStorage()
	// 检查oss对象
	stat, exists, err := storage.ObjectStats(ctx, param.ObjectName)
	if err != nil {
		return nil, fmt.Errorf("failed to get object stats: %w", err)
	}
	if !exists {
		return nil, fmt.Errorf("object not exists")
	}

	// 检查文件夹
	folder, err := GetDocFolder(ctx, auth, param.FolderID)
	if err != nil {
		return nil, err
	}

	// 将对象从临时地址移动到新地址
	newObjectName := fmt.Sprintf("%s/%s/%s", auth.Owner, time.Now().UTC().Format(time.DateOnly), param.Name)
	if err := storage.MoveObject(ctx, param.ObjectName, newObjectName); err != nil {
		return nil, fmt.Errorf("failed to move object: %w", err)
	}

	doc := model.Doc{
		Base:        model.Base{OrgID: auth.Owner},
		Name:        param.Name,
		IsDeletable: true,
		IsEditable:  true,
		FolderID:    param.FolderID,
		ObjectName:  newObjectName,
		UploadedAt:  stat.LastModified,
		CreatedBy:   auth.Id,
		Folder:      folder,
	}
	if err := query.Doc.Create(&doc); err != nil {
		return nil, fmt.Errorf("failed to create doc: %w", err)
	}
	return &doc, nil
}

func GetDoc(ctx context.Context, auth *casdoorsdk.User, id string) (*model.Doc, error) {
	doc, err := query.Doc.
		Where(
			query.Doc.OrgID.Eq(auth.Owner),
			query.Doc.ID.Eq(id),
		).
		Preload(query.Doc.Folder).
		Take()
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, fmt.Errorf("specified doc not exists")
	}
	if err != nil {
		return nil, err
	}
	return doc, nil
}

func UpdateDoc(ctx context.Context, auth *casdoorsdk.User, id string, body *schema.UpdateDoc) (*model.Doc, error) {
	if _, err := GetDoc(ctx, auth, id); err != nil {
		return nil, fmt.Errorf("failed to get doc: %w", err)
	}

	var updates []field.AssignExpr
	if body.Name != nil {
		updates = append(updates, query.Doc.Name.Value(*body.Name))
	}

	if body.FolderID != nil {
		if _, err := GetDocFolder(ctx, auth, *body.FolderID); err != nil {
			return nil, fmt.Errorf("failed to get doc folder: %w", err)
		}
		updates = append(updates, query.Doc.FolderID.Value(*body.FolderID))
	}

	if _, err := query.Doc.UpdateColumnSimple(updates...); err != nil {
		return nil, fmt.Errorf("failed to update doc: %w", err)
	}
	return GetDoc(ctx, auth, id)
}

func DeleteDoc(ctx context.Context, auth *casdoorsdk.User, id string) error {
	doc, err := GetDoc(ctx, auth, id)
	if err != nil {
		return fmt.Errorf("failed to get doc: %w", err)
	}
	if err := dal.GetStorage().DeleteObject(ctx, doc.ObjectName); err != nil {
		return fmt.Errorf("failed to delete object: %w", err)
	}
	_, err = query.Doc.Where(query.Doc.OrgID.Eq(auth.Owner), query.Doc.ID.Eq(id)).Delete()
	if err != nil {
		return fmt.Errorf("failed to delete doc: %w", err)
	}
	return nil
}

func DeleteDocBatch(ctx context.Context, auth *casdoorsdk.User, param *schema.DocsBatchDelete) *schema.DocBatchResults {
	results := make(schema.DocBatchResults, 0, len(param.IDs))
	// NOTE: 后面应该需要优化一下
	for _, docID := range param.IDs {
		err := DeleteDoc(ctx, auth, docID)
		if err != nil {
			results = append(results, schema.DocBatchResult{ID: docID, Success: false, Error: err.Error()})
		} else {
			results = append(results, schema.DocBatchResult{ID: docID, Success: true})
		}
	}
	return &results
}

func UpdateDocBatch(ctx context.Context, auth *casdoorsdk.User, param *schema.DocsBatchUpdate) *schema.DocBatchResults {
	results := make(schema.DocBatchResults, 0, len(param.IDs))
	// NOTE: 后面应该需要优化一下
	for _, docID := range param.IDs {
		_, err := UpdateDoc(ctx, auth, docID, &schema.UpdateDoc{FolderID: param.FolderID})
		if err != nil {
			results = append(results, schema.DocBatchResult{ID: docID, Success: false, Error: err.Error()})
		} else {
			results = append(results, schema.DocBatchResult{ID: docID, Success: true})
		}
	}
	return &results
}

func CreateUploadURL(ctx context.Context, auth *casdoorsdk.User, param *schema.CreateUploadURL) (u *url.URL, objectName string, err error) {
	tmpObjectName := fmt.Sprintf("/tmp/%s/%s-%s", auth.Owner, xid.New(), param.FileName)
	u, err = dal.GetStorage().PresignedPutObject(ctx, tmpObjectName, time.Hour)
	if err != nil {
		return nil, "", fmt.Errorf("failed to create presigned url: %w", err)
	}
	return u, tmpObjectName, nil
}