import type { RequestContext } from '../../core/http.js';
import { intParam, stringParam, tenantIdFrom } from '../../core/request.js';
import { query, queryOne } from '../../core/db.js';

export async function scorelineFieldsRoute(ctx: RequestContext) {
  const tenantId = tenantIdFrom(ctx);
  const regionId = stringParam(ctx, 'regionId');

  const items = await query(
    `
    select id, legacy_id as "legacyId", region_id as "regionId",
           field_key as "fieldKey", field_name as "fieldName",
           field_type as "fieldType", unit, is_filter as "isFilter",
           is_required as "isRequired", is_visible as "isVisible",
           is_trend as "isTrend", options, placeholder, description,
           sort_order as "sortOrder", created_at as "createdAt",
           updated_at as "updatedAt"
    from public.scoreline_fields
    where tenant_id = $1 and ($2::uuid is null or region_id = $2::uuid)
    order by sort_order asc, field_name asc
    `,
    [tenantId, regionId || null],
  );

  return { items };
}

export async function scorelineSchoolsRoute(ctx: RequestContext) {
  const tenantId = tenantIdFrom(ctx);
  const regionId = stringParam(ctx, 'regionId');
  const q = stringParam(ctx, 'q');
  const limit = intParam(ctx, 'limit', 200, 1000);

  const items = await query(
    `
    select id, legacy_id as "legacyId", region_id as "regionId",
           name, short_name as "shortName", type, is_hot as "isHot",
           sort_order as "order", created_at as "createdAt",
           updated_at as "updatedAt"
    from public.scoreline_schools
    where tenant_id = $1
      and ($2::uuid is null or region_id = $2::uuid)
      and ($3::text = '' or name ilike '%' || $3 || '%' or short_name ilike '%' || $3 || '%')
    order by is_hot desc, sort_order asc, name asc, type asc nulls last
    limit $4
    `,
    [tenantId, regionId || null, q, limit],
  );

  return { items };
}

export async function scorelineMajorsRoute(ctx: RequestContext) {
  const tenantId = tenantIdFrom(ctx);
  const regionId = stringParam(ctx, 'regionId');
  const schoolId = stringParam(ctx, 'schoolId');
  const limit = intParam(ctx, 'limit', 500, 2000);

  const items = await query(
    `
    select id, legacy_id as "legacyId", region_id as "regionId",
           school_id as "schoolId", name, sort_order as "order",
           has_restriction as "hasRestriction", restriction_desc as "restrictionDesc",
           created_at as "createdAt", updated_at as "updatedAt"
    from public.scoreline_majors
    where tenant_id = $1
      and ($2::uuid is null or region_id = $2::uuid)
      and ($3::uuid is null or school_id = $3::uuid)
    order by sort_order asc, name asc
    limit $4
    `,
    [tenantId, regionId || null, schoolId || null, limit],
  );

  return { items };
}

export async function scorelineRecordsRoute(ctx: RequestContext) {
  const tenantId = tenantIdFrom(ctx);
  const regionId = stringParam(ctx, 'regionId');
  const schoolId = stringParam(ctx, 'schoolId');
  const majorId = stringParam(ctx, 'majorId');
  const year = Number(ctx.url.searchParams.get('year') || 0);
  const page = intParam(ctx, 'page', 1, 10_000);
  const pageSize = intParam(ctx, 'pageSize', intParam(ctx, 'perPage', 20, 100), 100);
  const offset = (page - 1) * pageSize;

  const where = `
    tenant_id = $1
    and ($2::uuid is null or region_id = $2::uuid)
    and ($3::uuid is null or school_id = $3::uuid)
    and ($4::uuid is null or major_id = $4::uuid)
    and ($5::integer = 0 or year = $5::integer)
  `;
  const params = [tenantId, regionId || null, schoolId || null, majorId || null, Number.isFinite(year) ? Math.trunc(year) : 0];

  const [countRow, items] = await Promise.all([
    queryOne<{ total: string }>(`select count(*)::text as total from public.scoreline_records where ${where}`, params),
    query(
      `
      select id, legacy_id as "legacyId", region_id as "regionId",
             school_id as "schoolId", major_id as "majorId", year,
             school_name as "schoolName", major_name as "majorName",
             field_values as "fieldValues", created_at as "createdAt",
             updated_at as "updatedAt"
      from public.scoreline_records
      where ${where}
      order by year desc, school_name asc nulls last, major_name asc nulls last
      limit $6 offset $7
      `,
      [...params, pageSize, offset],
    ),
  ]);

  return {
    page,
    pageSize,
    total: Number(countRow?.total || 0),
    items,
  };
}

export async function scorelineTrendRoute(ctx: RequestContext) {
  const tenantId = tenantIdFrom(ctx);
  const regionId = stringParam(ctx, 'regionId');
  const schoolId = stringParam(ctx, 'schoolId');
  const majorId = stringParam(ctx, 'majorId');
  const limit = intParam(ctx, 'limit', 20, 100);

  const items = await query(
    `
    select id, region_id as "regionId", school_id as "schoolId",
           major_id as "majorId", year, school_name as "schoolName",
           major_name as "majorName", field_values as "fieldValues"
    from public.scoreline_records
    where tenant_id = $1
      and ($2::uuid is null or region_id = $2::uuid)
      and ($3::uuid is null or school_id = $3::uuid)
      and ($4::uuid is null or major_id = $4::uuid)
    order by year asc, major_name asc nulls last
    limit $5
    `,
    [tenantId, regionId || null, schoolId || null, majorId || null, limit],
  );

  return { items };
}

export async function scorelineYearsRoute(ctx: RequestContext) {
  const tenantId = tenantIdFrom(ctx);
  const regionId = stringParam(ctx, 'regionId');

  const items = await query<{ year: number }>(
    `
    select distinct year
    from public.scoreline_records
    where tenant_id = $1 and ($2::uuid is null or region_id = $2::uuid)
    order by year desc
    `,
    [tenantId, regionId || null],
  );

  return { items: items.map(item => item.year) };
}