/**
 * * **Current State:** The `AppController` seeder includes a dynamic regex and fallback system to resolve and assign a `phaseCode` attribute to blocks during block seeding (lines 75-94).
 * * **Intended Mutation:** Remove the dynamic regex resolution block and `phaseCode` mapping from `mappedBlock` within the `2. BLOCK SEEDING` loop to achieve flat block seeding.
 * * **Risk Mitigation:** Cross-entity validation is entirely shifted to the `FFB Production` ledger level, making the master block seeder 100% independent.
 */

import { Controller, Get, Logger, BadRequestException } from '@nestjs/common';
import { AppService } from './app.service';
import { PhaseService } from './site/services/phase.service';
import { BlockService } from './site/services/block.service';
import { FFBProductionService } from './FFB/services/ffb-production.service';
import * as fs from 'fs';
import * as path from 'path';

@Controller()
export class AppController {
  private readonly logger: Logger = new Logger('AppController');

  constructor(
    private readonly service: AppService,
    private readonly phaseService: PhaseService,
    private readonly blockService: BlockService,
    private readonly ffbService: FFBProductionService,
  ) { }

  @Get()
  getHello(): string {
    return this.service.getHello();
  }

  @Get('seed')
  async seedSystemData() {
    this.logger.log('🚀 Starting chronological seeding...');

    // Resolve JSON data file locations dynamically relative to process.cwd()
    const rootDir = process.cwd();
    const phaseDataPath = path.resolve(rootDir, '../mongo stuff/PhaseData.json');
    const blockDataPath = path.resolve(rootDir, '../mongo stuff/BlockData.json');
    const ffbDataPath = path.resolve(rootDir, '../mongo stuff/FFBProductionData.json');

    // 1. PHASE SEEDING
    if (!fs.existsSync(phaseDataPath)) {
      throw new BadRequestException(`PhaseData.json not found at ${phaseDataPath}`);
    }
    const rawPhases = JSON.parse(fs.readFileSync(phaseDataPath, 'utf8'));
    this.logger.log(`Found ${rawPhases.length} phases to process.`);

    for (const rawPhase of rawPhases) {
      try {
        const mappedPhase = {
          locId: Number(rawPhase.loc_id),
          phaseCode: rawPhase.name,
          description: rawPhase.description,
          locType: rawPhase.loc_type,
        };
        await this.phaseService.create(mappedPhase);
      } catch (err) {
        this.logger.error(`Error inserting Phase ${rawPhase.name}: ${err.message}`);
      }
    }
    console.log('[SEED] Phase collection initialization pass complete.');

    // 2. BLOCK SEEDING
    if (!fs.existsSync(blockDataPath)) {
      throw new BadRequestException(`BlockData.json not found at ${blockDataPath}`);
    }
    const rawBlocks = JSON.parse(fs.readFileSync(blockDataPath, 'utf8'));
    this.logger.log(`Found ${rawBlocks.length} blocks to process.`);

    for (const rawBlock of rawBlocks) {
      try {
        const mappedBlock = {
          locId: Number(rawBlock.loc_id),
          blockCode: rawBlock.blockCode,
          blockDesc: rawBlock.blockDesc,
          locType: rawBlock.loc_type,
          entryNo: Number(rawBlock.entry_no),
          entryYear: Number(rawBlock.entry_year),
          quarterPlanted: Number(rawBlock.quater_planted),
          monthPlanted: rawBlock.month_planted,
          totalTrees: Number(rawBlock.numOfTreesPlanted),
          totalMaturedTrees: Number(rawBlock.totalTreeMatured),
          totalImmaturedTrees: Number(rawBlock.totalTreeImmatured),
          totalDeadTrees: Number(rawBlock.totalTreeDead),
          plantedArea: Number(rawBlock.totalPlantedArea),
          initialPlantedArea: Number(rawBlock.initalPlantedArea),
          plantedLocUOM: rawBlock.plantedLocUOM,
          soilCondition: rawBlock.loc_soil_condition,
        };
        await this.blockService.create(mappedBlock);
      } catch (err) {
        this.logger.error(`Error inserting Block ${rawBlock.blockCode}: ${err.message}`);
      }
    }
    console.log('[SEED] Block collection initialization pass complete.');

    // 3. FFB TRANSACTION INGESTION & VECTOR ENRICHMENT STREAM
    if (!fs.existsSync(ffbDataPath)) {
      throw new BadRequestException(`FFBProductionData.json not found at ${ffbDataPath}`);
    }
    const rawFfbs = JSON.parse(fs.readFileSync(ffbDataPath, 'utf8'));
    
    // Trigger background seeder worker to prevent HTTP timeout
    this.runBackgroundFfbSeed(rawFfbs);

    this.logger.log(`[SEED] Ingestion worker spawned for all ${rawFfbs.length} records.`);
    return {
      status: 'success',
      message: `Chronological seeding initiated for ${rawFfbs.length} transaction records in the background. Monitor server logs for live updates.`,
    };
  }

  private async runBackgroundFfbSeed(records: any[]) {
    const CHUNK_SIZE = 5;  // Adjust down if CPU is weak, up to 10 if using a dedicated GPU
    const COOL_DOWN_MS = 1000; // 1 second pause between chunks to let the CPU breathe
    
    this.logger.log(`[WORKER] Beginning processing matrix for ${records.length} items...`);
    
    for (let i = 0; i < records.length; i += CHUNK_SIZE) {
      const chunk = records.slice(i, i + CHUNK_SIZE);
      this.logger.log(`[WORKER] Processing batch chunk ${Math.floor(i / CHUNK_SIZE) + 1} of ${Math.ceil(records.length / CHUNK_SIZE)}...`);
      
      for (const rawFfb of chunk) {
        try {
          const mappedFfb = {
            productionDate: rawFfb.productionDate ? new Date(rawFfb.productionDate) : new Date('2024-01-01'),
            prjCode: rawFfb.prj_code,
            actCode: rawFfb.act_code,
            actName: rawFfb.act_name,
            entityCode: rawFfb.entitycode,
            orgnId: rawFfb.orgn_id ? Number(rawFfb.orgn_id) : 0,
            orgnCode: rawFfb.orgn_code,
            orgnFullName: rawFfb.orgn_full_name,
            orgnAddress: rawFfb.orgn_address,
            orgnCompRegNo: rawFfb.orgn_comp_reg_no,
            phaseCode: rawFfb.phaseCode || 'PH01',
            phaseName: rawFfb.phaseName || 'PHASE 01',
            phaseDesc: rawFfb.phaseDesc || 'PHASE 01',
            blockCode: rawFfb.blockCode,
            blockName: rawFfb.blockName || null,
            blockDesc: rawFfb.blockDesc || null,
            truckNo: rawFfb.truck_no,
            millNo: rawFfb.mill_no,
            actEntryNo: rawFfb.act_entry_no ? Number(rawFfb.act_entry_no) : 0,
            actRound: rawFfb.act_round ? Number(rawFfb.act_round) : 0,
            weightChitNo: rawFfb.weight_chit_no,
            ownNetWeight: rawFfb.own_net_weight ? Number(rawFfb.own_net_weight) : null,
            netWeight: rawFfb.net_weight ? Number(rawFfb.net_weight) : 0,
            actUom: rawFfb.act_uom,
            noOfBunches: rawFfb.no_of_bunches ? Number(rawFfb.no_of_bunches) : 0,
            qtyUom: rawFfb.qty_uom,
            docActQty: rawFfb.doc_act_qty ? Number(rawFfb.doc_act_qty) : 0,
            locArea: rawFfb.loc_area ? Number(rawFfb.loc_area) : 0,
            locUom: rawFfb.loc_uom,
            budgetedFfb: rawFfb.budgeted_ffb ? Number(rawFfb.budgeted_ffb) : null,
            remarks: rawFfb.remarks || '',
            issues: rawFfb.issues || null,
          };
          
          await this.ffbService.create(mappedFfb);
        } catch (err) {
          this.logger.error(`[WORKER ERROR] Step failed for record entry: ${err.message}`);
        }
      }
      
      // Enforce the event-loop cool down period
      if (i + CHUNK_SIZE < records.length) {
        await new Promise(resolve => setTimeout(resolve, COOL_DOWN_MS));
      }
    }
    this.logger.log(`[WORKER] ✅ SUCCESS! Full ledger dataset vectorization and seeder run complete.`);
  }
}