import { _decorator, assetManager, Button, ImageAsset, instantiate, Label, Node, ScrollView, Sprite, SpriteFrame, Texture2D, UITransform } from 'cc';
import { BaseView } from 'db://assets/scripts/core/BaseView';
import { ViewManager } from 'db://assets/scripts/core/ViewManager';
import { ShareManager } from 'db://assets/scripts/utils/ShareManager';
import { SubmitShareData, SubmittedShareLevelData } from 'db://assets/scripts/types/ApiTypes';
const { ccclass, property } = _decorator;

@ccclass('PagePKEnd')
export class PagePKEnd extends BaseView {
    private static readonly ANSWER_ITEM_TOP_PADDING = 16;
    private static readonly ANSWER_ITEM_BOTTOM_PADDING = 16;
    private static readonly ANSWER_ITEM_SPACING = 16;
    private static readonly COVER_IMAGE_WIDTH = 1299;
    private static readonly COVER_IMAGE_HEIGHT = 1004;

    @property({ type: Node, tooltip: '返回首页按钮' })
    settingButton: Node | null = null;

    @property({ type: Label, tooltip: '顶部排名文案，例如：获得了第1名' })
    rankLabel: Label | null = null;

    @property({ type: Label, tooltip: '答对题数文案，例如：答对了4题' })
    rightNumberLabel: Label | null = null;

    @property({ type: Label, tooltip: '本人排名文案，例如：您获得了第1名' })
    rankNumberLabel: Label | null = null;

    @property({ type: Label, tooltip: '参与人数文案，例如：一共66人参与了挑战' })
    participateNumberLabel: Label | null = null;

    @property({ type: Label, tooltip: '答案列表标题' })
    answerTitleLabel: Label | null = null;

    @property({ type: Node, tooltip: '答案列表 content 节点' })
    answerListContent: Node | null = null;

    @property({ type: Node, tooltip: '答案列表条目模板 AnswerItem' })
    answerItemTemplate: Node | null = null;

    private _answerItemNodes: Node[] = [];
    private _answerButtonBindings: Array<{ node: Node; handler: () => void }> = [];
    private _renderVersion: number = 0;

    onViewLoad(): void {
        this._resolveNodes();
        this._bindEvents();
        this._hideAnswerTemplate();
    }

    onViewShow(): void {
        console.log('[PagePKEnd] onViewShow');
        this._resolveNodes();
        this._renderResult(this.getParams()?.result ?? null);
    }

    onViewDestroy(): void {
        this._unbindEvents();
        this._clearAnswerItems();
    }

    private _resolveNodes(): void {
        if (!this.settingButton || !this.settingButton.isValid) {
            this.settingButton = this.node.getChildByName('SettingButton');
        }

        this.rankLabel = this.rankLabel ?? this._findLabel('RankLabel');
        this.rightNumberLabel = this.rightNumberLabel ?? this._findLabel('RightNumberLabel');
        this.rankNumberLabel = this.rankNumberLabel ?? this._findLabel('RankNumberLabel');
        this.participateNumberLabel = this.participateNumberLabel ?? this._findLabel('PartipateNumberLabel');
        this.answerTitleLabel = this.answerTitleLabel ?? this._findLabel('AnswerTitle');

        const answerList = this.node.getChildByName('AnswerList');
        const view = answerList?.getChildByName('view');
        this.answerListContent = this.answerListContent ?? view?.getChildByName('content') ?? null;
        this.answerItemTemplate = this.answerItemTemplate
            ?? this.answerListContent?.getChildByName('AnswerItem')
            ?? null;

        if (!this.settingButton) {
            console.warn('[PagePKEnd] 未找到 SettingButton 节点');
        }
        if (!this.answerListContent) {
            console.warn('[PagePKEnd] 未找到 AnswerList/content 节点');
        }
        if (!this.answerItemTemplate) {
            console.warn('[PagePKEnd] 未找到 AnswerItem 模板节点');
        }
    }

    private _bindEvents(): void {
        const button = this.settingButton?.getComponent(Button);
        if (!button) {
            console.warn('[PagePKEnd] SettingButton 缺少 Button 组件');
            return;
        }

        this.settingButton?.on(Button.EventType.CLICK, this._onHomeClick, this);
    }

    private _unbindEvents(): void {
        if (this.settingButton && this.settingButton.isValid) {
            this.settingButton.off(Button.EventType.CLICK, this._onHomeClick, this);
        }
        this._unbindAnswerButtons();
    }

    private _onHomeClick(): void {
        ShareManager.instance.clearShareMode();
        ViewManager.instance.replace('PageHome');
    }

    private _renderResult(result: SubmitShareData | null): void {
        this._renderVersion++;
        this._clearAnswerItems();

        if (!result) {
            this._setLabel(this.rankLabel, '暂无排名');
            this._setLabel(this.rightNumberLabel, '答对了0题');
            this._setLabel(this.rankNumberLabel, '您暂未上榜');
            this._setLabel(this.participateNumberLabel, '暂无参与数据');
            this._setLabel(this.answerTitleLabel, '暂无挑战结果');
            this._hideAnswerTemplate();
            return;
        }

        this._setLabel(this.rankLabel, `获得了第${result.rank}名`);
        this._setLabel(this.rightNumberLabel, `答对了${result.correctCount}题`);
        this._setLabel(this.rankNumberLabel, `您获得了第${result.rank}名`);
        this._setLabel(this.participateNumberLabel, `一共${result.participantCount}人参与了挑战`);
        this._setLabel(this.answerTitleLabel, `共用时${result.totalTimeSpent}s，揭晓答案吧`);
        this._renderAnswerList(result.levels ?? []);
    }

    private _renderAnswerList(levels: SubmittedShareLevelData[]): void {
        if (!this.answerListContent || !this.answerItemTemplate) {
            return;
        }

        this._hideAnswerTemplate();
        const version = this._renderVersion;
        this._layoutAnswerContent(levels.length);

        levels.forEach((level, index) => {
            const item = instantiate(this.answerItemTemplate!);
            item.name = `AnswerItem_${index + 1}`;
            item.active = true;
            this.answerListContent!.addChild(item);
            this._answerItemNodes.push(item);
            this._positionAnswerItem(item, index);

            this._applyAnswerState(item, level);

            const coverSprite = this._findChild(item, 'CoverImage')?.getComponent(Sprite) ?? null;
            this._prepareCoverSprite(coverSprite);
            this._loadCoverImage(level.image1Url, coverSprite, version);
        });

        this._scrollAnswerListToTop();
    }

    private _layoutAnswerContent(itemCount: number): void {
        if (!this.answerListContent || !this.answerItemTemplate) {
            return;
        }

        const contentTransform = this.answerListContent.getComponent(UITransform);
        const viewTransform = this.answerListContent.parent?.getComponent(UITransform) ?? null;
        const itemTransform = this.answerItemTemplate.getComponent(UITransform);
        if (!contentTransform || !viewTransform || !itemTransform) {
            return;
        }

        const itemHeight = itemTransform.height;
        const contentHeight = Math.max(
            viewTransform.height,
            PagePKEnd.ANSWER_ITEM_TOP_PADDING
                + PagePKEnd.ANSWER_ITEM_BOTTOM_PADDING
                + itemCount * itemHeight
                + Math.max(0, itemCount - 1) * PagePKEnd.ANSWER_ITEM_SPACING,
        );

        contentTransform.setContentSize(contentTransform.width, contentHeight);
        this.answerListContent.setPosition(
            this.answerListContent.position.x,
            viewTransform.height / 2,
            this.answerListContent.position.z,
        );
    }

    private _positionAnswerItem(item: Node, index: number): void {
        const itemTransform = item.getComponent(UITransform);
        if (!itemTransform) {
            return;
        }

        const y = -PagePKEnd.ANSWER_ITEM_TOP_PADDING
            - itemTransform.height / 2
            - index * (itemTransform.height + PagePKEnd.ANSWER_ITEM_SPACING);
        item.setPosition(0, y, item.position.z);
    }

    private _applyAnswerState(item: Node, level: SubmittedShareLevelData): void {
        const answerButton = this._findChild(item, 'ButtonViewAnswer');
        const buttonLabel = answerButton?.getChildByName('Label')?.getComponent(Label) ?? null;
        const answerLabelNode = this._findChild(item, 'AnswerLabel');
        const answerLabel = answerLabelNode?.getComponent(Label) ?? null;

        this._setLabel(buttonLabel, '查看答案');
        this._setLabel(answerLabel, level.answer || '-');

        if (level.isCorrect) {
            if (answerButton) {
                answerButton.active = false;
            }
            if (answerLabelNode) {
                answerLabelNode.active = true;
            }
            return;
        }

        if (answerButton) {
            answerButton.active = true;
        }
        if (answerLabelNode) {
            answerLabelNode.active = false;
        }

        const handler = () => {
            if (answerButton?.isValid) {
                answerButton.active = false;
            }
            if (answerLabelNode?.isValid) {
                answerLabelNode.active = true;
            }
        };
        if (answerButton) {
            answerButton.on(Button.EventType.CLICK, handler, this);
            this._answerButtonBindings.push({ node: answerButton, handler });
        }
    }

    private _scrollAnswerListToTop(): void {
        const scrollView = this.node.getChildByName('AnswerList')?.getComponent(ScrollView);
        scrollView?.scrollToTop(0);
    }

    private _loadCoverImage(url: string, sprite: Sprite | null, version: number): void {
        if (!url || !sprite) {
            return;
        }

        this._prepareCoverSprite(sprite);
        assetManager.loadRemote<ImageAsset>(url, (err, imageAsset) => {
            if (err || !imageAsset || version !== this._renderVersion || !sprite.node.isValid) {
                if (err) {
                    console.error('[PagePKEnd] 加载答案封面失败:', url, err);
                }
                return;
            }

            const texture = new Texture2D();
            texture.image = imageAsset;
            const spriteFrame = new SpriteFrame();
            spriteFrame.texture = texture;
            this._prepareCoverSprite(sprite);
            sprite.spriteFrame = spriteFrame;
            this._prepareCoverSprite(sprite);
        });
    }

    private _prepareCoverSprite(sprite: Sprite | null): void {
        if (!sprite?.node.isValid) {
            return;
        }

        sprite.sizeMode = Sprite.SizeMode.CUSTOM;
        const transform = sprite.node.getComponent(UITransform);
        if (transform) {
            transform.setContentSize(PagePKEnd.COVER_IMAGE_WIDTH, PagePKEnd.COVER_IMAGE_HEIGHT);
        }
        sprite.node.setScale(0.242, 0.242, 0.242);
    }

    private _clearAnswerItems(): void {
        this._unbindAnswerButtons();

        for (const item of this._answerItemNodes) {
            if (item.isValid) {
                item.removeFromParent();
                item.destroy();
            }
        }
        this._answerItemNodes = [];
        this._hideAnswerTemplate();
    }

    private _unbindAnswerButtons(): void {
        for (const binding of this._answerButtonBindings) {
            if (binding.node.isValid) {
                binding.node.off(Button.EventType.CLICK, binding.handler, this);
            }
        }
        this._answerButtonBindings = [];
    }

    private _hideAnswerTemplate(): void {
        if (this.answerItemTemplate?.isValid) {
            this.answerItemTemplate.active = false;
        }
    }

    private _setLabel(label: Label | null, text: string): void {
        if (label) {
            label.string = text;
        }
    }

    private _findLabel(nodeName: string): Label | null {
        return this._findChild(this.node, nodeName)?.getComponent(Label) ?? null;
    }

    private _findChild(root: Node, nodeName: string): Node | null {
        if (root.name === nodeName) {
            return root;
        }

        for (const child of root.children) {
            const found = this._findChild(child, nodeName);
            if (found) {
                return found;
            }
        }

        return null;
    }
}