import './index.css';
import { CollapseOptions, CollapseItemConfig } from './types';
import { IBimComponent } from '../../types/component';
import { t, localeManager } from '../../services/locale';
import { themeManager } from '../../services/theme';
import type { ThemeConfig } from '../../themes/types';

/**
 * 单个折叠面板项
 */
class BimCollapseItem {
    public element: HTMLElement;
    public headerEl!: HTMLElement;
    public contentEl!: HTMLElement;
    public contentBoxEl!: HTMLElement;
    public arrowEl!: HTMLElement;
    public titleEl!: HTMLElement;

    private config: CollapseItemConfig;
    private parent: BimCollapse;

    constructor(config: CollapseItemConfig, parent: BimCollapse) {
        this.config = config;
        this.parent = parent;
        this.element = this.createDom();
    }

    private createDom(): HTMLElement {
        const itemEl = document.createElement('div');
        itemEl.className = `bim-collapse-item ${this.config.className || ''}`;
        if (this.config.disabled) itemEl.classList.add('is-disabled');
        itemEl.dataset.id = this.config.id;

        // ��部区域
        this.headerEl = document.createElement('div');
        this.headerEl.className = 'bim-collapse-header';

        // 箭头图标
        this.arrowEl = document.createElement('span');
        this.arrowEl.className = 'bim-collapse-arrow';
        this.arrowEl.innerHTML = `<svg viewBox="0 0 1024 1024"><path d="M288 192l448 320-448 320z"></path></svg>`;
        this.headerEl.appendChild(this.arrowEl);

        // 自定义图标 (可选)
        if (this.config.icon) {
            const iconEl = document.createElement('span');
            iconEl.className = 'bim-collapse-icon';
            iconEl.innerHTML = this.config.icon;
            this.headerEl.appendChild(iconEl);
        }

        // 标题文本
        this.titleEl = document.createElement('span');
        this.titleEl.className = 'bim-collapse-title';
        this.titleEl.textContent = t(this.config.title); // 初始翻译
        this.headerEl.appendChild(this.titleEl);

        // 额外内容 (可选，如右侧标签)
        if (this.config.extra) {
            const extraEl = document.createElement('div');
            extraEl.className = 'bim-collapse-extra';
            if (typeof this.config.extra === 'string') {
                extraEl.innerHTML = this.config.extra;
            } else {
                extraEl.appendChild(this.config.extra);
            }
            this.headerEl.appendChild(extraEl);
        }

        // 点击事件
        this.headerEl.addEventListener('click', () => {
            if (this.config.disabled) return;
            this.parent.toggleItem(this.config.id);
        });

        itemEl.appendChild(this.headerEl);

        // 内容区域
        this.contentEl = document.createElement('div');
        this.contentEl.className = 'bim-collapse-content is-hidden';

        this.contentBoxEl = document.createElement('div');
        this.contentBoxEl.className = 'bim-collapse-content-box';

        if (typeof this.config.content === 'string') {
            this.contentBoxEl.innerHTML = this.config.content;
        } else {
            this.contentBoxEl.appendChild(this.config.content);
        }

        this.contentEl.appendChild(this.contentBoxEl);
        itemEl.appendChild(this.contentEl);

        return itemEl;
    }

    public updateLocale() {
        if (this.titleEl) {
            this.titleEl.textContent = t(this.config.title);
        }
    }

    public setActive(isActive: boolean) {
        if (isActive) {
            this.element.classList.add('is-active');
            this.contentEl.classList.remove('is-hidden');
            // 简单的动画处理：设置 height
            // 实际生产中可能需要更复杂的 JS 动画库或 transitionend 事件处理
            // 这里依赖 CSS transition
        } else {
            this.element.classList.remove('is-active');
            this.contentEl.classList.add('is-hidden');
        }
    }
}

/**
 * 折叠面板组件
 */
export class BimCollapse implements IBimComponent {
    private element: HTMLElement;
    private options: CollapseOptions;
    private items: Map<string, BimCollapseItem> = new Map();
    private activeIds: Set<string> = new Set();
    private unsubscribeLocale: (() => void) | null = null;
    private unsubscribeTheme: (() => void) | null = null;

    constructor(options: CollapseOptions) {
        this.options = {
            bordered: true,
            accordion: false,
            ...options
        };

        this.element = document.createElement('div');
        this.element.className = `bim-collapse ${this.options.className || ''}`;
        if (!this.options.bordered) this.element.style.border = 'none';
        if (this.options.ghost) this.element.classList.add('is-ghost');

        const container = typeof this.options.container === 'string'
            ? document.getElementById(this.options.container)
            : this.options.container;

        if (container) {
            container.appendChild(this.element);
        }

        // 初始化激活的 ID
        if (this.options.activeIds) {
            this.options.activeIds.forEach(id => this.activeIds.add(id));
        }

        this.init();
    }

    public init() {
        // 创建子项
        this.options.items.forEach(itemConfig => {
            const item = new BimCollapseItem(itemConfig, this);
            this.items.set(itemConfig.id, item);
            this.element.appendChild(item.element);

            // 设置初始状态
            if (this.activeIds.has(itemConfig.id)) {
                item.setActive(true);
            }
        });

        // 订阅语言变更
        this.unsubscribeLocale = localeManager.subscribe(() => {
            this.setLocales();
        });

        // 订阅主题变更
        this.unsubscribeTheme = themeManager.subscribe((theme) => {
            this.setTheme(theme);
        });

        // 初始应用主题
        this.setTheme(themeManager.getTheme());
    }

    public toggleItem(id: string) {
        const isActive = this.activeIds.has(id);

        if (this.options.accordion) {
            // 手风琴模式：关闭其他所有，只展开目标
            this.activeIds.clear();
            if (!isActive) {
                this.activeIds.add(id);
            }
        } else {
            // 普通模式：切换目标状态
            if (isActive) {
                this.activeIds.delete(id);
            } else {
                this.activeIds.add(id);
            }
        }

        this.refreshState();

        if (this.options.onChange) {
            this.options.onChange(Array.from(this.activeIds));
        }
    }

    private refreshState() {
        this.items.forEach((item, id) => {
            item.setActive(this.activeIds.has(id));
        });
    }

    public setTheme(theme: ThemeConfig): void {
        const style = this.element.style;
        style.setProperty('--bim-bg-color', theme.bgElevated);
        style.setProperty('--bim-border-color', theme.borderDefault);
        style.setProperty('--bim-text-color', theme.textPrimary);
        style.setProperty('--bim-header-bg-color', theme.componentBgHover);
        style.setProperty('--bim-header-hover-bg-color', theme.componentBgActive);
        style.setProperty('--bim-content-bg-color', theme.bgElevated);
        style.setProperty('--bim-disabled-color', theme.textDisabled);
    }

    public setLocales(): void {
        this.items.forEach(item => item.updateLocale());
    }

    public destroy(): void {
        if (this.unsubscribeLocale) {
            this.unsubscribeLocale();
            this.unsubscribeLocale = null;
        }
        if (this.unsubscribeTheme) {
            this.unsubscribeTheme();
            this.unsubscribeTheme = null;
        }
        this.element.remove();
        this.items.clear();
    }
}