package com.goldenchart.controller;

import com.goldenchart.dto.TrendSearchRequest;
import com.goldenchart.dto.TrendSearchResultDto;
import com.goldenchart.dto.TrendSearchResultsResponse;
import com.goldenchart.service.TrendSearchService;
import com.goldenchart.service.TrendSearchSnapshotService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * 암호화폐 추세검색 API.
 *
 * POST /api/trend-search/scan    — 조건 스캔 후 DB 스냅샷 갱신
 * GET  /api/trend-search/results — DB 스냅샷 조회 (자동 갱신 화면용)
 * GET  /api/trend-search/detail  — 단일 종목 상세
 */
@RestController
@RequestMapping("/trend-search")
@RequiredArgsConstructor
@Slf4j
public class TrendSearchController {

    private final TrendSearchService trendSearchService;
    private final TrendSearchSnapshotService snapshotService;

    @PostMapping("/scan")
    public ResponseEntity<List<TrendSearchResultDto>> scan(
            @RequestHeader(value = "X-User-Id", required = false) String userIdHeader,
            @RequestHeader(value = "X-Device-Id", required = false) String deviceId,
            @RequestBody TrendSearchRequest request) {
        log.info("[TrendSearch] scan tf={} limit={}", request.getTimeframe(), request.getLimit());
        Long userId = parseUserId(userIdHeader);
        return ResponseEntity.ok(snapshotService.scanAndPersist(userId, deviceId, request));
    }

    @GetMapping("/results")
    public ResponseEntity<TrendSearchResultsResponse> results(
            @RequestHeader(value = "X-User-Id", required = false) String userIdHeader,
            @RequestHeader(value = "X-Device-Id", required = false) String deviceId) {
        Long userId = parseUserId(userIdHeader);
        return ResponseEntity.ok(snapshotService.getResults(userId, deviceId));
    }

    @GetMapping("/detail")
    public ResponseEntity<TrendSearchResultDto> detail(
            @RequestParam String market,
            @RequestParam(required = false) String timeframe) {
        TrendSearchRequest req = new TrendSearchRequest();
        if (timeframe != null) req.setTimeframe(timeframe);
        return ResponseEntity.ok(trendSearchService.detail(market, req));
    }

    private Long parseUserId(String header) {
        if (header == null || header.isBlank()) return null;
        try {
            return Long.parseLong(header);
        } catch (NumberFormatException e) {
            return null;
        }
    }
}