import { NextRequest, NextResponse } from 'next/server';
import { createClient } from '@/lib/supabase/server';
import {
  isAgencyRole,
  serviceHeaders,
  supabaseUrl,
  userRole,
} from '@/lib/agency';
import { resolveActiveTenant } from '@/lib/tenant-context';
import {
  ASSETS_BUCKET,
  MAX_ASSET_BYTES,
  ensureAssetsBucket,
  sanitizeFileName,
  sanitizeFolder,
  serviceSupabase,
} from '@/lib/assets';
import { createHash, randomUUID } from 'crypto';

export const dynamic = 'force-dynamic';
export const runtime = 'nodejs';

async function gate() {
  const supabase = await createClient();
  const {
    data: { user },
  } = await supabase.auth.getUser();
  if (!user) {
    return { error: NextResponse.json({ error: 'Unauthorized' }, { status: 401 }) };
  }
  const ctx = await resolveActiveTenant(user);
  if (ctx.portfolioWide || !ctx.tenantId) {
    return {
      error: NextResponse.json(
        { error: 'Selecciona un cliente en Contexto antes de gestionar activos.' },
        { status: 400 }
      ),
    };
  }
  return { user, ctx, agency: isAgencyRole(userRole(user)) };
}

/** GET — list approved files for active tenant */
export async function GET() {
  const g = await gate();
  if ('error' in g && g.error) return g.error;
  const { ctx, agency } = g as Awaited<ReturnType<typeof gate>> & {
    ctx: { tenantId: string };
    agency: boolean;
  };

  const headers = serviceHeaders();
  if (agency && headers) {
    const r = await fetch(
      `${supabaseUrl()}/rest/v1/asset_files?tenant_id=eq.${encodeURIComponent(ctx.tenantId!)}&status=eq.approved&select=*&order=created_at.desc`,
      { headers, cache: 'no-store' }
    );
    if (!r.ok) {
      const msg = await r.text();
      return NextResponse.json({
        assets: [],
        warning: msg.includes('does not exist')
          ? 'Aplicar sql/asset_files.sql'
          : msg.slice(0, 200),
      });
    }
    return NextResponse.json({ assets: await r.json() });
  }

  const supabase = await createClient();
  const { data, error } = await supabase
    .from('asset_files')
    .select('*')
    .eq('status', 'approved')
    .order('created_at', { ascending: false });
  if (error) {
    return NextResponse.json({
      assets: [],
      warning: error.message,
    });
  }
  return NextResponse.json({ assets: data ?? [] });
}

/** POST multipart: files[] + optional folder */
export async function POST(req: NextRequest) {
  const g = await gate();
  if ('error' in g && g.error) return g.error;
  const { user, ctx } = g as Awaited<ReturnType<typeof gate>> & {
    user: { id: string };
    ctx: { tenantId: string };
  };

  const bucketOk = await ensureAssetsBucket();
  if (!bucketOk.ok) {
    return NextResponse.json(
      { error: `Storage bucket: ${bucketOk.error}` },
      { status: 503 }
    );
  }

  const svc = serviceSupabase();
  const headers = serviceHeaders();
  if (!svc || !headers) {
    return NextResponse.json(
      { error: 'Falta SUPABASE_SERVICE_ROLE_KEY' },
      { status: 503 }
    );
  }

  const form = await req.formData();
  const folder = sanitizeFolder(String(form.get('folder') || ''));
  const files = form.getAll('files').filter((f): f is File => f instanceof File);

  if (!files.length) {
    return NextResponse.json({ error: 'Ningún archivo' }, { status: 400 });
  }

  const uploaded: unknown[] = [];
  const errors: string[] = [];

  for (const file of files) {
    if (file.size <= 0) {
      errors.push(`${file.name}: vacío`);
      continue;
    }
    if (file.size > MAX_ASSET_BYTES) {
      errors.push(`${file.name}: supera 80 MB`);
      continue;
    }

    const safeName = sanitizeFileName(file.name);
    const id = randomUUID();
    const pathParts = [ctx.tenantId!, folder, `${id}_${safeName}`].filter(
      Boolean
    );
    const storagePath = pathParts.join('/');
    const buf = Buffer.from(await file.arrayBuffer());
    const sha256 = createHash('sha256').update(buf).digest('hex');

    const up = await svc.storage.from(ASSETS_BUCKET).upload(storagePath, buf, {
      contentType: file.type || 'application/octet-stream',
      upsert: false,
    });
    if (up.error) {
      errors.push(`${file.name}: ${up.error.message}`);
      continue;
    }

    const row = {
      id,
      tenant_id: ctx.tenantId,
      title: safeName,
      folder,
      file_name: safeName,
      mime_type: file.type || 'application/octet-stream',
      bytes: file.size,
      storage_path: storagePath,
      sha256,
      status: 'approved',
      created_by: user.id,
    };

    const ins = await fetch(`${supabaseUrl()}/rest/v1/asset_files`, {
      method: 'POST',
      headers: {
        ...headers,
        'Content-Type': 'application/json',
        Prefer: 'return=representation',
      },
      body: JSON.stringify(row),
    });
    if (!ins.ok) {
      await svc.storage.from(ASSETS_BUCKET).remove([storagePath]);
      errors.push(`${file.name}: ${await ins.text()}`);
      continue;
    }
    const created = await ins.json();
    uploaded.push(Array.isArray(created) ? created[0] : created);
  }

  return NextResponse.json(
    { uploaded, errors },
    { status: uploaded.length ? 201 : 400 }
  );
}

/** DELETE ?id= */
export async function DELETE(req: NextRequest) {
  const g = await gate();
  if ('error' in g && g.error) return g.error;
  const { ctx } = g as Awaited<ReturnType<typeof gate>> & {
    ctx: { tenantId: string };
  };

  const id = req.nextUrl.searchParams.get('id')?.trim();
  if (!id) {
    return NextResponse.json({ error: 'id requerido' }, { status: 400 });
  }

  const headers = serviceHeaders();
  const svc = serviceSupabase();
  if (!headers || !svc) {
    return NextResponse.json({ error: 'no service role' }, { status: 503 });
  }

  const get = await fetch(
    `${supabaseUrl()}/rest/v1/asset_files?id=eq.${encodeURIComponent(id)}&tenant_id=eq.${encodeURIComponent(ctx.tenantId!)}&select=id,storage_path`,
    { headers, cache: 'no-store' }
  );
  if (!get.ok) {
    return NextResponse.json({ error: await get.text() }, { status: 500 });
  }
  const rows = await get.json();
  const row = rows[0];
  if (!row) {
    return NextResponse.json({ error: 'No encontrado' }, { status: 404 });
  }

  await svc.storage.from(ASSETS_BUCKET).remove([row.storage_path]);
  const del = await fetch(
    `${supabaseUrl()}/rest/v1/asset_files?id=eq.${encodeURIComponent(id)}`,
    { method: 'DELETE', headers }
  );
  if (!del.ok) {
    return NextResponse.json({ error: await del.text() }, { status: 500 });
  }
  return NextResponse.json({ ok: true });
}