package com.aiteacher.enrichment;

import com.aiteacher.book.Book;
import com.aiteacher.book.BookRepository;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.NoSuchElementException;
import java.util.UUID;

@RestController
@RequestMapping("/api/v1/admin/books/{id}/enrich")
public class EnrichmentController {

    private final BookRepository bookRepository;
    private final EnrichmentBackfillService backfillService;

    public EnrichmentController(BookRepository bookRepository,
                                 EnrichmentBackfillService backfillService) {
        this.bookRepository = bookRepository;
        this.backfillService = backfillService;
    }

    @PostMapping
    public ResponseEntity<EnrichmentBackfillService.BackfillProgress> start(@PathVariable UUID id) {
        Book book = bookRepository.findById(id)
            .orElseThrow(() -> new NoSuchElementException("Book not found."));
        backfillService.backfillBook(id, book.getTitle());
        int total = backfillService.countTotalTextChunks(id);
        int enriched = backfillService.countEnrichedChunks(id).orElse(0);
        return ResponseEntity.status(HttpStatus.ACCEPTED)
            .body(new EnrichmentBackfillService.BackfillProgress("RUNNING", total, enriched, null));
    }

    @GetMapping
    public ResponseEntity<EnrichmentBackfillService.BackfillProgress> status(@PathVariable UUID id) {
        bookRepository.findById(id)
            .orElseThrow(() -> new NoSuchElementException("Book not found."));
        EnrichmentBackfillService.BackfillProgress progress = backfillService.getProgress(id);
        if ("IDLE".equals(progress.status())) {
            int total = backfillService.countTotalTextChunks(id);
            int enriched = backfillService.countEnrichedChunks(id).orElse(0);
            progress = new EnrichmentBackfillService.BackfillProgress(
                enriched >= total && total > 0 ? "COMPLETED" : "IDLE",
                total, enriched, null);
        }
        return ResponseEntity.ok(progress);
    }
}