import { Node } from 'cc';
import { LevelConfig } from './LevelTypes';
import { LevelMapData } from './LevelMapData';
import { themeForLevelId } from './LevelIds';

function hasKeys(rec?: Record<string, unknown>): boolean {
    return !!rec && Object.keys(rec).length > 0;
}

function parseJsonRecord(json: string): Record<string, unknown> | undefined {
    try {
        const o = JSON.parse(json || '{}') as unknown;
        if (o && typeof o === 'object' && !Array.isArray(o)) {
            return o as Record<string, unknown>;
        }
    } catch {
        /* ignore */
    }
    return undefined;
}

/**
 * 预制体 LevelMapData（编辑器里看到的地图）为地图/主题权威。
 * levels-database 只提供 spawns / boundary；仅当预制体没有地图数据时才回退到库。
 */
export function mergeLevelConfigWithMapData(config: LevelConfig, levelRoot: Node): LevelConfig {
    if (!levelRoot?.isValid) return config;
    const md = levelRoot.getComponent(LevelMapData);
    if (!md) return config;

    const prefabGround = parseJsonRecord(md.groundJson) as LevelConfig['ground'];
    const prefabBorder = parseJsonRecord(md.borderJson) as LevelConfig['border'];
    const prefabTheme = md.theme?.trim();
    const seriesTheme = themeForLevelId(config.levelID);
    const prefabHasMap =
        hasKeys(prefabGround as Record<string, unknown>)
        || hasKeys(prefabBorder as Record<string, unknown>);

    if (!prefabHasMap) {
        return {
            ...config,
            theme: seriesTheme || config.theme?.trim() || prefabTheme || 'silu',
        };
    }

    return {
        ...config,
        theme: seriesTheme || prefabTheme || config.theme?.trim() || 'silu',
        ground: hasKeys(prefabGround as Record<string, unknown>) ? prefabGround : config.ground,
        // 预制体已写过地图：空边框就是没有边框，不要用库里的旧 border 补上
        border: prefabBorder ?? {},
    };
}