// src/harvest/harvest.service.ts
import { Injectable } from '@nestjs/common';
import { HarvestActivity } from './activity.schema';
import { CreateActivityDto, UpdateActivityDto } from './activity.dto';
import { ObjectId } from 'mongodb';
import { MongoService } from 'src/services/mongo.service';

@Injectable()
export class ActivityService {
    private readonly collectionName = 'activities';

    constructor(private readonly mongo: MongoService) { }

    /* ------------------------------
     * Utility: Convert DTO to Schema
     * ------------------------------ */
    private dtoToHarvestActivity(dto: CreateActivityDto): HarvestActivity {
        return {
            name: dto.name,
            type: dto.type,
            resources: dto.resources.map((r) => ({
                ...r,
                id: r.id ? new ObjectId(r.id) : new ObjectId(),
            })),
            duration: dto.duration,
            outputs: dto.outputs.map((o) => ({
                ...o,
                id: o.id ? new ObjectId(o.id) : new ObjectId(),
            })),
            targets: dto.targets.map((t) => ({
                ...t,
                id: t.id ? new ObjectId(t.id) : new ObjectId(),
            })),
            dateStart: new Date(dto.dateStart),
            dateEnd: new Date(dto.dateEnd),
        };
    }

    /* ------------------------------
     * CRUD OPERATIONS
     * ------------------------------ */
    async create(dto: CreateActivityDto) {
        const activity = this.dtoToHarvestActivity(dto);
        return this.mongo.createActivity(activity);
    }

    async findAll(filter: Record<string, any> = {}) {
        return this.mongo.getAllActivities(filter);
    }

    async findById(id: string) {
        return this.mongo.getActivityById(id);
    }

    async update(id: string, dto: UpdateActivityDto) {
        // For partial updates, we only convert provided IDs
        const update: any = { ...dto };
        if (dto.duration) {
            update.duration = {
                value: {
                    quantity: dto.duration.value?.quantity ?? 0,
                    uom: dto.duration.value?.uom ?? 'hours',
                },
            };
        }
        if (dto.resources) {
            update.resources = dto.resources.map((r) => ({
                ...r,
                id: r.id ? new ObjectId(r.id) : new ObjectId(),
            }));
        }
        if (dto.outputs) {
            update.outputs = dto.outputs.map((o) => ({
                ...o,
                id: o.id ? new ObjectId(o.id) : new ObjectId(),
            }));
        }
        if (dto.targets) {
            update.targets = dto.targets.map((t) => ({
                ...t,
                id: t.id ? new ObjectId(t.id) : new ObjectId(),
            }));
        }
        if (dto.dateStart) update.dateStart = new Date(dto.dateStart);
        if (dto.dateEnd) update.dateEnd = new Date(dto.dateEnd);

        return this.mongo.updateActivity(id, update);
    }

    async delete(id: string) {
        return this.mongo.deleteActivity(id);
    }

    /* ------------------------------
     * Aggregations / Queries
     * ------------------------------ */

    async getTotalResourceHours() {
        return this.mongo.getTotalResourceHours();
    }

    async getTotalOutputWeight() {
        return this.mongo.getTotalOutputWeight();
    }

    async findByDateRange(start: Date, end: Date) {
        return this.mongo.getActivitiesByDateRange(start, end);
    }

    /* ------------------------------
   * Aggregations / Custom Queries
   * ------------------------------ */

    async getTotalWorkers(filter: { start?: Date; end?: Date; location?: string }) {
        return this.mongo.getTotalWorkers(filter);
    }

    async getTotalOutputs(filter: { start?: Date; end?: Date }) {
        return this.mongo.getTotalOutputs(filter);
    }



}