package sql

import (
	"bytes"
	"fmt"
	"strings"

	"github.com/88250/lute"
	"github.com/88250/lute/ast"
	"github.com/88250/lute/parse"
	"github.com/88250/lute/render"
	"github.com/siyuan-note/siyuan/kernel/av"
	"github.com/siyuan-note/siyuan/kernel/treenode"
	"github.com/siyuan-note/siyuan/kernel/util"
)

func RenderAttributeViewGallery(attrView *av.AttributeView, view *av.View, query string) (ret *av.Gallery) {
	ret = &av.Gallery{
		BaseInstance: &av.BaseInstance{
			ID:               view.ID,
			Icon:             view.Icon,
			Name:             view.Name,
			Desc:             view.Desc,
			HideAttrViewName: view.HideAttrViewName,
			Filters:          view.Gallery.Filters,
			Sorts:            view.Gallery.Sorts,
		},
		CoverFrom:           view.Gallery.CoverFrom,
		CoverFromAssetKeyID: view.Gallery.CoverFromAssetKeyID,
		CardSize:            view.Gallery.CardSize,
		FitImage:            view.Gallery.FitImage,
		ShowIcon:            view.Gallery.ShowIcon,
		WrapField:           view.Gallery.WrapField,
		Fields:              []*av.GalleryField{},
		Cards:               []*av.GalleryCard{},
	}

	// 组装字段
	for _, field := range view.Gallery.CardFields {
		key, getErr := attrView.GetKey(field.ID)
		if nil != getErr {
			// 找不到字段则在视图中删除
			removeMissingField(attrView, view, field.ID)
			continue
		}

		ret.Fields = append(ret.Fields, &av.GalleryField{
			BaseInstanceField: &av.BaseInstanceField{
				ID:           key.ID,
				Name:         key.Name,
				Type:         key.Type,
				Icon:         key.Icon,
				Hidden:       field.Hidden,
				Desc:         key.Desc,
				Options:      key.Options,
				NumberFormat: key.NumberFormat,
				Template:     key.Template,
				Relation:     key.Relation,
				Rollup:       key.Rollup,
				Date:         key.Date,
			},
		})
	}

	cardsValues := generateAttrViewItems(attrView) // 生成卡片
	filterNotFoundAttrViewItems(&cardsValues)      // 过滤掉不存在的卡片

	// 生成卡片字段值
	for cardID, cardValues := range cardsValues {
		var galleryCard av.GalleryCard
		for _, field := range ret.Fields {
			var fieldValue *av.GalleryFieldValue
			for _, keyValues := range cardValues {
				if keyValues.Key.ID == field.ID {
					fieldValue = &av.GalleryFieldValue{
						BaseValue: &av.BaseValue{
							ID:        keyValues.Values[0].ID,
							Value:     keyValues.Values[0],
							ValueType: field.Type,
						},
					}
					break
				}
			}
			if nil == fieldValue {
				fieldValue = &av.GalleryFieldValue{
					BaseValue: &av.BaseValue{
						ID:        ast.NewNodeID(),
						ValueType: field.Type,
					},
				}
			}
			galleryCard.ID = cardID

			fillAttributeViewBaseValue(fieldValue.BaseValue, field.ID, cardID, field.NumberFormat, field.Template)
			galleryCard.Values = append(galleryCard.Values, fieldValue)
		}

		fillAttributeViewGalleryCardCover(attrView, view, cardValues, &galleryCard, cardID, luteEngine)
		ret.Cards = append(ret.Cards, &galleryCard)
	}

	// 批量获取块属性以提升性能
	var ialIDs []string
	for _, card := range ret.Cards {
		block := card.GetBlockValue()
		if nil != block && !block.IsDetached {
			ialIDs = append(ialIDs, card.ID)
		}
	}
	ials := BatchGetBlockAttrs(ialIDs)

	// 渲染自动生成的字段值，比如关联字段、汇总字段、创建时间字段和更新时间字段
	avCache := map[string]*av.AttributeView{}
	avCache[attrView.ID] = attrView
	for _, card := range ret.Cards {
		for _, value := range card.Values {
			fillAttributeViewAutoGeneratedValues(attrView, ials, value.Value, card, cardsValues, &avCache)
		}
	}

	// 最后单独渲染模板字段，这样模板字段就可以使用汇总、关联、创建时间和更新时间字段的值了
	var renderTemplateErr error
	for _, card := range ret.Cards {
		for _, value := range card.Values {
			err := fillAttributeViewTemplateValue(value.Value, card, attrView, ials, cardsValues)
			if nil != err {
				renderTemplateErr = err
			}
		}
	}
	if nil != renderTemplateErr {
		util.PushErrMsg(fmt.Sprintf(util.Langs[util.Lang][44], util.EscapeHTML(renderTemplateErr.Error())), 30000)
	}

	filterByQuery(query, ret)
	manualSort(view.Gallery, ret)
	return
}

func fillAttributeViewGalleryCardCover(attrView *av.AttributeView, view *av.View, cardValues []*av.KeyValues, galleryCard *av.GalleryCard, cardID string, luteEngine *lute.Lute) {
	switch view.Gallery.CoverFrom {
	case av.CoverFromNone:
	case av.CoverFromContentImage:
		blockValue := getBlockValue(cardValues)
		if blockValue.IsDetached {
			break
		}

		tree := loadTreeByBlockID(blockValue.BlockID)
		if nil == tree {
			break
		}
		node := treenode.GetNodeInTree(tree, blockValue.BlockID)
		if nil == node {
			break
		}

		if ast.NodeDocument == node.Type {
			if titleImg := treenode.GetDocTitleImgPath(node); "" != titleImg {
				galleryCard.CoverURL = titleImg
				break
			}

			if titleImgCss := node.IALAttr("title-img"); "" != titleImgCss {
				galleryCard.CoverURL = titleImgCss
				break
			}
		}

		ast.Walk(node, func(n *ast.Node, entering bool) ast.WalkStatus {
			if !entering {
				return ast.WalkContinue
			}

			if ast.NodeImage != n.Type {
				return ast.WalkContinue
			}

			dest := n.ChildByType(ast.NodeLinkDest)
			if nil == dest {
				return ast.WalkContinue
			}
			galleryCard.CoverURL = dest.TokensStr()
			return ast.WalkStop
		})

		if "" == galleryCard.CoverURL {
			if ast.NodeDocument == node.Type {
				node = node.FirstChild
			}

			buf := bytes.Buffer{}
			for c := node; nil != c; c = c.Next {
				buf.WriteString(renderBlockDOMByNode(c, luteEngine))
				if 1024*4 < buf.Len() {
					break
				}
			}
			galleryCard.CoverContent = buf.String()
			return
		}
	case av.CoverFromAssetField:
		if "" == view.Gallery.CoverFromAssetKeyID {
			break
		}

		assetValue := attrView.GetValue(view.Gallery.CoverFromAssetKeyID, cardID)
		if nil == assetValue || 1 > len(assetValue.MAsset) {
			break
		}

		galleryCard.CoverURL = assetValue.MAsset[0].Content
		return
	}
}

func renderBlockDOMByNode(node *ast.Node, luteEngine *lute.Lute) string {
	tree := &parse.Tree{Root: &ast.Node{Type: ast.NodeDocument}, Context: &parse.Context{ParseOption: luteEngine.ParseOptions}}
	blockRenderer := render.NewProtyleRenderer(tree, luteEngine.RenderOptions)
	blockRenderer.Options.ProtyleContenteditable = false
	ast.Walk(node, func(node *ast.Node, entering bool) ast.WalkStatus {
		rendererFunc := blockRenderer.RendererFuncs[node.Type]
		return rendererFunc(node, entering)
	})
	h := strings.TrimSpace(blockRenderer.Writer.String())
	if strings.HasPrefix(h, "<li") {
		h = "<ul>" + h + "</ul>"
	}
	return h
}