import "server-only";

import { LicitationSource, Prisma, SyncRunStatus } from "@prisma/client";
import { licitationsConfig } from "@/lib/licitations/config";
import { fetchMunicipalBackupLicitations, fetchMunicipalOpenLicitations } from "@/lib/licitations/connectors/municipal";
import { fetchPntLicitations } from "@/lib/licitations/connectors/pnt";
import { buildStableRecordId, sanitizeDocuments } from "@/lib/licitations/normalize";
import { prisma } from "@/lib/prisma";
import type { ConnectorResult, MunicipalityConnectorInput, SyncStats } from "@/lib/licitations/types";
import { delay } from "@/lib/licitations/utils";

const MUNICIPALITY_SELECT = {
  id: true,
  stateCode: true,
  stateName: true,
  municipalityCode: true,
  municipalityName: true,
  openPortalUrl: true,
  openPortalType: true,
  openSyncIntervalDays: true,
  lastOpenSyncAt: true,
  pntSubjectId: true,
  pntEntityId: true,
  pntSectorId: true,
  pntEntryUrl: true,
  backupUrl: true,
  scrapingEnabled: true,
  isActive: true,
} satisfies Prisma.MunicipalitySelect;

function createEmptyStats(): SyncStats {
  return {
    totalFetched: 0,
    inserted: 0,
    updated: 0,
    skipped: 0,
    errors: 0,
    latestPublishDate: null,
  };
}

function toNullableJson(value: Record<string, unknown> | null | undefined) {
  return value ? (value as Prisma.InputJsonValue) : Prisma.DbNull;
}

function getLatestPublishDate(items: { publishDate?: Date | null }[]) {
  let latest: Date | null = null;

  for (const item of items) {
    if (!item.publishDate) {
      continue;
    }

    if (!latest || item.publishDate > latest) {
      latest = item.publishDate;
    }
  }

  return latest;
}

function inferOpenFlag(source: LicitationSource, item: { isOpen?: boolean; closingDate?: Date | null }) {
  if (typeof item.isOpen === "boolean") {
    return item.isOpen;
  }

  if (source !== LicitationSource.MUNICIPAL_OPEN_PORTAL) {
    return false;
  }

  if (!item.closingDate) {
    return true;
  }

  return item.closingDate >= new Date();
}

async function upsertConnectorItems(municipality: MunicipalityConnectorInput, connectorResult: ConnectorResult): Promise<SyncStats> {
  const stats = createEmptyStats();
  stats.totalFetched = connectorResult.items.length;

  const latestDate = getLatestPublishDate(connectorResult.items);
  stats.latestPublishDate = latestDate ? latestDate.toISOString() : null;

  for (const item of connectorResult.items) {
    try {
      const title = item.title?.trim();

      if (!title) {
        stats.skipped += 1;
        continue;
      }

      const sourceRecordId = (item.sourceRecordId?.trim() || buildStableRecordId(municipality, item)).slice(0, 255);
      const existing = await prisma.licitation.findUnique({
        where: {
          municipalityId_source_sourceRecordId: {
            municipalityId: municipality.id,
            source: connectorResult.source,
            sourceRecordId,
          },
        },
        select: { id: true },
      });

      await prisma.licitation.upsert({
        where: {
          municipalityId_source_sourceRecordId: {
            municipalityId: municipality.id,
            source: connectorResult.source,
            sourceRecordId,
          },
        },
        update: {
          tenderCode: item.tenderCode ?? null,
          procedureType: item.procedureType,
          title,
          description: item.description ?? null,
          category: item.category ?? undefined,
          isOpen: inferOpenFlag(connectorResult.source, item),
          openingDate: item.openingDate ?? null,
          closingDate: item.closingDate ?? null,
          publishDate: item.publishDate ?? null,
          eventDates: toNullableJson(item.eventDates ?? null),
          amount: item.amount ?? null,
          currency: item.currency ?? null,
          status: item.status ?? null,
          supplierAwarded: item.supplierAwarded ?? null,
          documents: sanitizeDocuments(item.documents) as Prisma.InputJsonValue,
          rawSourceUrl: item.rawSourceUrl ?? connectorResult.rawSourceUrl ?? null,
          rawPayload: item.rawPayload as Prisma.InputJsonValue,
          lastSeenAt: new Date(),
        },
        create: {
          municipalityId: municipality.id,
          source: connectorResult.source,
          sourceRecordId,
          tenderCode: item.tenderCode ?? null,
          procedureType: item.procedureType,
          title,
          description: item.description ?? null,
          category: item.category ?? undefined,
          isOpen: inferOpenFlag(connectorResult.source, item),
          openingDate: item.openingDate ?? null,
          closingDate: item.closingDate ?? null,
          publishDate: item.publishDate ?? null,
          eventDates: toNullableJson(item.eventDates ?? null),
          amount: item.amount ?? null,
          currency: item.currency ?? null,
          status: item.status ?? null,
          supplierAwarded: item.supplierAwarded ?? null,
          documents: sanitizeDocuments(item.documents) as Prisma.InputJsonValue,
          rawSourceUrl: item.rawSourceUrl ?? connectorResult.rawSourceUrl ?? null,
          rawPayload: item.rawPayload as Prisma.InputJsonValue,
          lastSeenAt: new Date(),
        },
      });

      if (existing) {
        stats.updated += 1;
      } else {
        stats.inserted += 1;
      }
    } catch {
      stats.errors += 1;
    }
  }

  return stats;
}

function resolveSyncStatus(stats: SyncStats): SyncRunStatus {
  if (stats.errors === 0) {
    return SyncRunStatus.SUCCESS;
  }

  if (stats.inserted > 0 || stats.updated > 0) {
    return SyncRunStatus.PARTIAL;
  }

  return SyncRunStatus.FAILED;
}

async function runConnectorSync(municipality: MunicipalityConnectorInput, source: LicitationSource, connector: () => Promise<ConnectorResult>) {
  const syncRun = await prisma.syncRun.create({
    data: {
      municipalityId: municipality.id,
      source,
      status: SyncRunStatus.SUCCESS,
    },
  });

  try {
    const connectorResult = await connector();
    const stats = await upsertConnectorItems(municipality, connectorResult);
    const status = resolveSyncStatus(stats);
    const error = status === SyncRunStatus.FAILED ? "No se pudieron persistir registros de licitaciones." : null;

    await prisma.syncRun.update({
      where: { id: syncRun.id },
      data: {
        finishedAt: new Date(),
        status,
        stats: {
          ...stats,
          warnings: connectorResult.warnings,
        },
        error,
      },
    });

    if (source === LicitationSource.MUNICIPAL_OPEN_PORTAL && status !== SyncRunStatus.FAILED) {
      await prisma.municipality.update({
        where: { id: municipality.id },
        data: {
          lastOpenSyncAt: new Date(),
        },
      });
    }

    return {
      source,
      status,
      stats,
      warnings: connectorResult.warnings,
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Error desconocido en sync.";

    await prisma.syncRun.update({
      where: { id: syncRun.id },
      data: {
        finishedAt: new Date(),
        status: SyncRunStatus.FAILED,
        stats: createEmptyStats(),
        error: message,
      },
    });

    return {
      source,
      status: SyncRunStatus.FAILED,
      stats: createEmptyStats(),
      warnings: [message],
    };
  }
}

async function shouldRunOpenSourceThisCycle(municipality: MunicipalityConnectorInput, force = false) {
  if (force) {
    return true;
  }

  const intervalDays = municipality.openSyncIntervalDays > 0 ? municipality.openSyncIntervalDays : 7;
  const now = new Date();

  if (municipality.lastOpenSyncAt) {
    const nextRunAt = new Date(municipality.lastOpenSyncAt);
    nextRunAt.setUTCDate(nextRunAt.getUTCDate() + intervalDays);

    if (nextRunAt > now) {
      return false;
    }
  }

  const latestRun = await prisma.syncRun.findFirst({
    where: {
      municipalityId: municipality.id,
      source: LicitationSource.MUNICIPAL_OPEN_PORTAL,
      status: {
        in: [SyncRunStatus.SUCCESS, SyncRunStatus.PARTIAL],
      },
      finishedAt: {
        not: null,
      },
    },
    orderBy: {
      finishedAt: "desc",
    },
    select: {
      finishedAt: true,
    },
  });

  if (!latestRun?.finishedAt) {
    return true;
  }

  const nextRunAt = new Date(latestRun.finishedAt);
  nextRunAt.setUTCDate(nextRunAt.getUTCDate() + intervalDays);

  return nextRunAt <= now;
}

export async function runMunicipalityLicitationsSync(
  municipality: MunicipalityConnectorInput,
  options?: {
    targetYear?: number;
    includePnt?: boolean;
    force?: boolean;
  },
) {
  const sourceResults: Array<{ source: LicitationSource; status: SyncRunStatus; stats: SyncStats; warnings: string[] }> = [];

  if (!licitationSyncEnabledForMunicipality(municipality)) {
    return {
      municipality,
      skipped: true,
      reason: "Scraping deshabilitado para municipio o entorno.",
      sourceResults,
    };
  }

  let openItemsFetched = 0;

  if (municipality.openPortalUrl && (await shouldRunOpenSourceThisCycle(municipality, options?.force))) {
    const openResult = await runConnectorSync(municipality, LicitationSource.MUNICIPAL_OPEN_PORTAL, () =>
      fetchMunicipalOpenLicitations(municipality, {
        targetYear: options?.targetYear,
      }),
    );

    sourceResults.push(openResult);
    openItemsFetched = openResult.stats.totalFetched;
    await delay(licitationsConfig.requestDelayMs);
  }

  if (openItemsFetched === 0 && municipality.backupUrl) {
    const backup = await runConnectorSync(municipality, LicitationSource.MUNICIPAL_BACKUP, () => fetchMunicipalBackupLicitations(municipality));
    sourceResults.push(backup);
    await delay(licitationsConfig.requestDelayMs);
  }

  if (options?.includePnt && (municipality.pntSubjectId || municipality.pntEntryUrl)) {
    const pnt = await runConnectorSync(municipality, LicitationSource.PNT, () =>
      fetchPntLicitations(municipality, {
        targetYear: options?.targetYear,
      }),
    );
    sourceResults.push(pnt);
  }

  return {
    municipality,
    skipped: false,
    reason: null,
    sourceResults,
  };
}

function licitationSyncEnabledForMunicipality(municipality: MunicipalityConnectorInput) {
  return licitationsConfig.scrapingEnabledByDefault && municipality.scrapingEnabled;
}

export async function runDailyLicitationsSync(options?: {
  municipalityId?: string;
  limit?: number;
  skip?: number;
  targetYear?: number;
  includePnt?: boolean;
  force?: boolean;
}) {
  const municipalities = await prisma.municipality.findMany({
    where: {
      isActive: true,
      ...(options?.municipalityId ? { id: options.municipalityId } : {}),
    },
    orderBy: [{ stateCode: "asc" }, { municipalityName: "asc" }],
    take: options?.limit ?? licitationsConfig.maxMunicipalitiesPerRun,
    skip: options?.skip ?? 0,
    select: MUNICIPALITY_SELECT,
  });

  const results = [] as Awaited<ReturnType<typeof runMunicipalityLicitationsSync>>[];

  for (const municipality of municipalities) {
    const result = await runMunicipalityLicitationsSync(municipality, {
      targetYear: options?.targetYear,
      includePnt: options?.includePnt,
      force: options?.force,
    });

    results.push(result);
    await delay(licitationsConfig.requestDelayMs);
  }

  return {
    processedMunicipalities: municipalities.length,
    skippedMunicipalities: options?.skip ?? 0,
    results,
  };
}