package com.aiteacher.topic;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

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

@RestController
@RequestMapping("/api/v1/topics")
public class TopicController {

    private final TopicRepository topicRepository;
    private final TopicSummaryService topicSummaryService;

    public TopicController(TopicRepository topicRepository,
                           TopicSummaryService topicSummaryService) {
        this.topicRepository = topicRepository;
        this.topicSummaryService = topicSummaryService;
    }

    @GetMapping
    public ResponseEntity<List<Topic>> list() {
        return ResponseEntity.ok(topicRepository.findAll());
    }

    @PostMapping("/{id}/summary")
    public ResponseEntity<TopicSummaryResponse> generateSummary(@PathVariable String id) {
        Topic topic = topicRepository.findById(id)
            .orElseThrow(() -> new NoSuchElementException("Topic not found."));

        TopicSummaryResponse response = topicSummaryService.generateSummary(topic);
        return ResponseEntity.ok(response);
    }

    @GetMapping("/{id}/summaries")
    public ResponseEntity<List<SavedSummaryItem>> listSummaries(@PathVariable String id) {
        topicRepository.findById(id)
            .orElseThrow(() -> new NoSuchElementException("Topic not found."));

        return ResponseEntity.ok(topicSummaryService.listSummaries(id));
    }

    @GetMapping("/{id}/summaries/{summaryId}")
    public ResponseEntity<TopicSummaryResponse> getSummary(@PathVariable String id,
                                                            @PathVariable UUID summaryId) {
        topicRepository.findById(id)
            .orElseThrow(() -> new NoSuchElementException("Topic not found."));

        return ResponseEntity.ok(topicSummaryService.getSummary(summaryId));
    }
}