import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Types, Model } from 'mongoose';
import { Build, BuildDocument } from '@/models/build.model';
import { CreateBuildInput } from './dto/create-build.input';
import { UpdateBuildAttributeInput, UpdateBuildResponsibleInput } from './dto/update-build.input';
import { ListBuildResponse } from './dto/list-build.response';

@Injectable()
export class BuildService {

    constructor(@InjectModel(Build.name) private readonly buildModel: Model<BuildDocument>) { }

    async findAll(projection: any, skip: number, limit: number, sort?: Record<string, 1 | -1>, filters?: Record<string, any>): Promise<ListBuildResponse> {
        const query: any = {}; if (filters && Object.keys(filters).length > 0) { Object.assign(query, filters) };
        const totalCount = await this.buildModel.countDocuments(query).exec();
        const data = await this.buildModel.find(query).skip(skip).limit(limit).sort(sort).exec();
        return { data, totalCount };
    }

    async findById(id: Types.ObjectId, projection?: any): Promise<BuildDocument | null> {
        return this.buildModel.findById(id, projection, { lean: false }).populate({ path: 'buildArea', select: projection?.buildArea }).exec();
    }

    async create(input: CreateBuildInput): Promise<BuildDocument> { const buildArea = new this.buildModel(input); return buildArea.save() }

    async updateResponsible(uuid: string, input: UpdateBuildResponsibleInput): Promise<BuildDocument> {
        const build = await this.buildModel.findOne({ uuid }); if (!build) { throw new Error('Build not found') }; build.set({ responsible: input }); return build.save()
    }

    async updateAttribute(uuid: string, input: UpdateBuildAttributeInput): Promise<BuildDocument> {
        const build = await this.buildModel.findOne({ uuid }); if (!build) { throw new Error('Build not found') }; build.set({ attribute: input }); return build.save()
    }

    buildProjection(fields: Record<string, any>): any {
        const projection: any = {};
        for (const key in fields) {
            if (key === 'build' && typeof fields[key] === 'object') { for (const subField of Object.keys(fields[key])) { projection[`build.${subField}`] = 1 } }
            else { projection[key] = 1 }
        }
        return projection;
    }

}