package com.lincfusion.udyamlinc.ingestion;

import com.lincfusion.udyamlinc.common.ApiResponse;
import com.lincfusion.udyamlinc.master.District;
import com.lincfusion.udyamlinc.master.DistrictRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.PageRequest;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * The operations surface for ingestion: what ran, what it fetched, and how stale
 * each district's data now is.
 *
 * <p>Mounted under {@code /admin} so the existing rule applies — any officer may
 * read, only a supervisor may trigger a run.
 */
@RestController
@RequestMapping("/admin/ingestion")
@RequiredArgsConstructor
public class IngestionController {

    private final IngestionScheduler scheduler;
    private final IngestionRunRepository runRepository;
    private final MarketSignalRepository marketSignalRepository;
    private final ClimateSignalRepository climateSignalRepository;
    private final ApiLogRepository apiLogRepository;
    private final DistrictRepository districtRepository;

    // ── what ran ────────────────────────────────────────────

    @GetMapping("/runs")
    public ApiResponse<List<IngestionRun>> runs(@RequestParam(required = false) String source,
                                                @RequestParam(defaultValue = "30") int limit) {
        PageRequest page = PageRequest.of(0, Math.min(limit, 200));
        return ApiResponse.ok(source == null
                ? runRepository.findAllByOrderByStartedAtDesc(page)
                : runRepository.findBySourceOrderByStartedAtDesc(source, page));
    }

    @GetMapping("/calls")
    public ApiResponse<List<ApiLog>> calls(@RequestParam(required = false) String source,
                                           @RequestParam(defaultValue = "50") int limit) {
        PageRequest page = PageRequest.of(0, Math.min(limit, 200));
        return ApiResponse.ok(source == null
                ? apiLogRepository.findAllByOrderByCalledAtDesc(page)
                : apiLogRepository.findBySourceOrderByCalledAtDesc(source, page));
    }

    // ── what it wrote ───────────────────────────────────────

    @GetMapping("/signals/market")
    public ApiResponse<List<MarketSignal>> marketSignals(@RequestParam(defaultValue = "12") int weeks) {
        return ApiResponse.ok(marketSignalRepository
                .findByWeekStartGreaterThanEqualOrderByWeekStartDesc(Weeks.startOf(LocalDate.now()).minusWeeks(weeks)));
    }

    @GetMapping("/signals/climate")
    public ApiResponse<List<ClimateSignal>> climateSignals(@RequestParam(defaultValue = "12") int weeks) {
        return ApiResponse.ok(climateSignalRepository
                .findByWeekStartGreaterThanEqualOrderByWeekStartDesc(Weeks.startOf(LocalDate.now()).minusWeeks(weeks)));
    }

    /**
     * Per-district freshness — the number a trip-wire consults before it is
     * allowed to fire. A rule firing on a three-week-old price is worse than no
     * rule.
     */
    @GetMapping("/freshness")
    public ApiResponse<List<Map<String, Object>>> freshness() {
        LocalDate today = LocalDate.now();
        List<Map<String, Object>> out = new ArrayList<>();
        for (District district : districtRepository.findByActiveTrue()) {
            LocalDate market = marketSignalRepository
                    .findFirstByDistrictIdOrderByValidForDateDesc(district.getId())
                    .map(MarketSignal::getValidForDate).orElse(null);
            LocalDate climate = climateSignalRepository
                    .findFirstByDistrictIdOrderByValidForDateDesc(district.getId())
                    .map(ClimateSignal::getValidForDate).orElse(null);
            Map<String, Object> row = new java.util.LinkedHashMap<>();
            row.put("districtCode", district.getCode());
            row.put("districtName", district.getName());
            row.put("marketValidFor", market);
            row.put("marketStalenessDays", market == null ? null : ChronoUnit.DAYS.between(market, today));
            row.put("climateValidFor", climate);
            row.put("climateStalenessDays", climate == null ? null : ChronoUnit.DAYS.between(climate, today));
            out.add(row);
        }
        return ApiResponse.ok(out);
    }

    // ── trigger ─────────────────────────────────────────────

    /** Supervisor only, by the {@code /admin/**} write rule in SecurityConfig. */
    @PostMapping("/run")
    public ApiResponse<List<IngestionRun>> runAll() {
        return ApiResponse.ok("Ingestion triggered", scheduler.runAll("MANUAL"));
    }

    @PostMapping("/run/{source}")
    public ApiResponse<IngestionRun> runOne(@PathVariable String source) {
        return ApiResponse.ok("Ingestion triggered", scheduler.run(source.toUpperCase(), "MANUAL"));
    }
}