import { describe, expect, it } from 'vitest';
import { buildOrderBy, buildTenderWhere } from './tender-query.builder';
import type { TenderQueryDto } from './dto/tender-query.dto';

/**
 * tender-query.builder.spec — RED-first (TDD) proof for FILTER-01/04/05,
 * UI-01 (D-01, D-04, D-05, D-06).
 *
 * Core test (Pitfall 3 / D-05): an active value filter must NEVER
 * eliminate estimatedValue=null rows — 91.6% of the live Tender data has
 * no estimatedValue, so a naive range filter would collapse the list.
 */

function dto(overrides: Partial<TenderQueryDto> = {}): TenderQueryDto {
  return overrides as TenderQueryDto;
}

describe('buildTenderWhere', () => {
  it('empty DTO: defaults to status=active and openOnly (deadline in future OR null)', () => {
    const where = buildTenderWhere(dto());

    expect(where.status).toBe('active');
    expect(where.AND).toEqual(
      expect.arrayContaining([
        {
          OR: [{ deadlineAt: { gte: expect.any(Date) } }, { deadlineAt: null }],
        },
      ]),
    );
  });

  it('openOnly=false omits the deadline-open constraint entirely', () => {
    const where = buildTenderWhere(dto({ openOnly: false }));

    const and = (where.AND as unknown[]) ?? [];
    const hasOpenClause = and.some(
      (clause) =>
        typeof clause === 'object' &&
        clause !== null &&
        'OR' in (clause as Record<string, unknown>) &&
        JSON.stringify(clause).includes('deadlineAt'),
    );
    expect(hasOpenClause).toBe(false);
  });

  it('deadlineFrom/deadlineTo set: adds an explicit deadlineAt range, combinable with openOnly', () => {
    const from = new Date('2026-08-01T00:00:00.000Z');
    const to = new Date('2026-08-31T23:59:59.000Z');
    const where = buildTenderWhere(dto({ deadlineFrom: from, deadlineTo: to }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ deadlineAt: { gte: from, lte: to } }]),
    );
    // openOnly default (true) still applied alongside the explicit range.
    expect(where.AND).toEqual(
      expect.arrayContaining([
        {
          OR: [{ deadlineAt: { gte: expect.any(Date) } }, { deadlineAt: null }],
        },
      ]),
    );
  });

  it('deadlineFrom only: range uses gte without lte', () => {
    const from = new Date('2026-08-01T00:00:00.000Z');
    const where = buildTenderWhere(dto({ deadlineFrom: from }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ deadlineAt: { gte: from } }]),
    );
  });

  it('q set: adds case-insensitive OR over title + buyerName', () => {
    const where = buildTenderWhere(dto({ q: 'Bau' }));

    expect(where.AND).toEqual(
      expect.arrayContaining([
        {
          OR: [
            { title: { contains: 'Bau', mode: 'insensitive' } },
            { buyerName: { contains: 'Bau', mode: 'insensitive' } },
          ],
        },
      ]),
    );
  });

  it('value filter with default includeNullValue: OR(range, null) — NULL rows survive', () => {
    const where = buildTenderWhere(dto({ valueMin: 1000, valueMax: 5000 }));

    expect(where.AND).toEqual(
      expect.arrayContaining([
        {
          OR: [
            { estimatedValue: { gte: 1000, lte: 5000 } },
            { estimatedValue: null },
          ],
        },
      ]),
    );
  });

  it('value filter with includeNullValue=false: pure range, no null branch', () => {
    const where = buildTenderWhere(
      dto({ valueMin: 1000, valueMax: 5000, includeNullValue: false }),
    );

    expect(where.AND).toEqual(
      expect.arrayContaining([{ estimatedValue: { gte: 1000, lte: 5000 } }]),
    );
    const and = (where.AND as unknown[]) ?? [];
    const hasOrNullBranch = and.some(
      (clause) =>
        typeof clause === 'object' &&
        clause !== null &&
        JSON.stringify(clause).includes('"estimatedValue":null'),
    );
    expect(hasOrNullBranch).toBe(false);
  });

  it('valueMin only: range has gte but no lte key', () => {
    const where = buildTenderWhere(dto({ valueMin: 1000 }));

    const and = (where.AND as Array<Record<string, unknown>>) ?? [];
    const valueClause = and.find(
      (c) => 'OR' in c && JSON.stringify(c).includes('estimatedValue'),
    ) as { OR: Array<Record<string, unknown>> } | undefined;
    const rangeBranch = valueClause?.OR.find(
      (b) => 'estimatedValue' in b && b.estimatedValue !== null,
    );
    expect(rangeBranch).toEqual({ estimatedValue: { gte: 1000 } });
  });

  it('explicit status overrides the active default', () => {
    const where = buildTenderWhere(dto({ status: 'expired' }));
    expect(where.status).toBe('expired');
  });

  it('plz set: adds a plz-startsWith constraint (FILTER-02)', () => {
    const where = buildTenderWhere(dto({ plz: '10' }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ plz: { startsWith: '10' } }]),
    );
  });

  it('bundesland set: adds an exact bundesland-equality constraint against the backfilled column (FILTER-02, Pitfall 1)', () => {
    const where = buildTenderWhere(dto({ bundesland: 'Bayern' }));

    expect(where.AND).toEqual(expect.arrayContaining([{ bundesland: 'Bayern' }]));
  });

  it('region set: adds a region-startsWith constraint, independent of bundesland (FILTER-02)', () => {
    const where = buildTenderWhere(dto({ region: 'DE2' }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ region: { startsWith: 'DE2' } }]),
    );
  });

  it('plz/bundesland/region are omitted from AND when unset', () => {
    const where = buildTenderWhere(dto());

    const and = (where.AND as unknown[]) ?? [];
    const hasGeoClause = and.some(
      (clause) =>
        typeof clause === 'object' &&
        clause !== null &&
        ('plz' in (clause as Record<string, unknown>) ||
          'bundesland' in (clause as Record<string, unknown>) ||
          'region' in (clause as Record<string, unknown>)),
    );
    expect(hasGeoClause).toBe(false);
  });

  it('cpv set: adds a cpvDivisions hasSome constraint (FILTER-03, Pitfall 2)', () => {
    const where = buildTenderWhere(dto({ cpv: ['45'] }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ cpvDivisions: { hasSome: ['45'] } }]),
    );
  });

  it('cpv with multiple divisions: hasSome carries all selected divisions', () => {
    const where = buildTenderWhere(dto({ cpv: ['45', '71'] }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ cpvDivisions: { hasSome: ['45', '71'] } }]),
    );
  });

  it('cpv omitted or empty is never added to AND', () => {
    const whereUnset = buildTenderWhere(dto());
    const whereEmpty = buildTenderWhere(dto({ cpv: [] }));

    for (const where of [whereUnset, whereEmpty]) {
      const and = (where.AND as unknown[]) ?? [];
      const hasCpvClause = and.some(
        (clause) =>
          typeof clause === 'object' &&
          clause !== null &&
          'cpvDivisions' in (clause as Record<string, unknown>),
      );
      expect(hasCpvClause).toBe(false);
    }
  });
});

describe('buildTenderWhere — favOnly (UI-04, D-10, T-11-10/11)', () => {
  it('favOnly=true with favIds supplied: adds an id-in constraint containing exactly those ids', () => {
    const where = buildTenderWhere(dto({ favOnly: true }), ['t1', 't2']);

    expect(where.AND).toEqual(
      expect.arrayContaining([{ id: { in: ['t1', 't2'] } }]),
    );
  });

  it('favOnly=true with empty favIds: yields a guaranteed-empty match, never "all tenders"', () => {
    const where = buildTenderWhere(dto({ favOnly: true }), []);

    expect(where.AND).toEqual(
      expect.arrayContaining([{ id: { in: ['__none__'] } }]),
    );
  });

  it('favOnly=true with favIds omitted entirely: also yields a guaranteed-empty match', () => {
    const where = buildTenderWhere(dto({ favOnly: true }));

    expect(where.AND).toEqual(
      expect.arrayContaining([{ id: { in: ['__none__'] } }]),
    );
  });

  it('favOnly unset: never adds an id-in constraint, regardless of favIds', () => {
    const where = buildTenderWhere(dto(), ['t1', 't2']);

    const and = (where.AND as unknown[]) ?? [];
    const hasFavClause = and.some(
      (clause) =>
        typeof clause === 'object' &&
        clause !== null &&
        'id' in (clause as Record<string, unknown>),
    );
    expect(hasFavClause).toBe(false);
  });

  it('favOnly=true with more favIds than MAX_FAV_IDS: the in-list is capped (T-11-11 DoS)', () => {
    const manyIds = Array.from({ length: 600 }, (_, i) => `t${i}`);
    const where = buildTenderWhere(dto({ favOnly: true }), manyIds);

    const and = (where.AND as Array<Record<string, unknown>>) ?? [];
    const favClause = and.find((c) => 'id' in c) as
      | { id: { in: string[] } }
      | undefined;
    expect(favClause?.id.in.length).toBeLessThanOrEqual(500);
  });
});

describe('buildTenderWhere — D-13 ownerTenantId visibility (Phase 14, Plan 03)', () => {
  it('a resolved ownerTenantId adds an OR[global, mine] clause', () => {
    const where = buildTenderWhere(dto(), undefined, 'tenant-a');

    expect(where.AND).toEqual(
      expect.arrayContaining([
        { OR: [{ ownerTenantId: null }, { ownerTenantId: 'tenant-a' }] },
      ]),
    );
  });

  it('an unresolved ownerTenantId (no auth context) fails closed to global-only tenders', () => {
    const where = buildTenderWhere(dto());

    expect(where.AND).toEqual(
      expect.arrayContaining([{ ownerTenantId: null }]),
    );
  });
});

describe('buildOrderBy', () => {
  it('sort=deadline maps to { deadlineAt: asc }', () => {
    expect(buildOrderBy('deadline')).toEqual({ deadlineAt: 'asc' });
  });

  it('sort=value maps to { estimatedValue: desc }', () => {
    expect(buildOrderBy('value')).toEqual({ estimatedValue: 'desc' });
  });

  it('sort=published maps to { publishedAt: desc }', () => {
    expect(buildOrderBy('published')).toEqual({ publishedAt: 'desc' });
  });

  it('unknown/missing sort key defaults to { publishedAt: desc }', () => {
    expect(buildOrderBy(undefined)).toEqual({ publishedAt: 'desc' });
    expect(buildOrderBy('not-a-real-key')).toEqual({ publishedAt: 'desc' });
  });
});