/**
 * Post-Migration Script: Migrate existing TenantSymbols to new architecture.
 *
 * Run AFTER applying the schema migration (20260520_symbol_architecture).
 *
 * Steps:
 * 1. Create a default "Meine Symbole" TenantCategory for each tenant that has TenantSymbols
 * 2. Migrate existing TenantSymbols: set name, svgPath, categoryId, migratedFromIconId
 * 3. Verify consistency
 *
 * Usage:
 *   npx ts-node prisma/migrate-tenant-symbols.ts
 */

import { PrismaClient } from '@prisma/client'

const prisma = new PrismaClient()

async function main() {
  console.log('🔧 Migrating existing TenantSymbols...')

  // Step 1: Get all tenants that have existing tenantSymbols
  const tenantsWithSymbols = await (prisma as any).tenantSymbol.groupBy({
    by: ['tenantId'],
    _count: { id: true },
  })

  console.log(`Found ${tenantsWithSymbols.length} tenants with existing symbols`)

  let categoriesCreated = 0
  let symbolsMigrated = 0

  for (const group of tenantsWithSymbols) {
    const tenantId = group.tenantId

    // Step 2: Create default category for this tenant
    let defaultCategory = await (prisma as any).tenantCategory.findFirst({
      where: { tenantId, name: 'Meine Symbole' },
    })

    if (!defaultCategory) {
      defaultCategory = await (prisma as any).tenantCategory.create({
        data: {
          tenantId,
          name: 'Meine Symbole',
          sortOrder: 0,
        },
      })
      categoriesCreated++
    }

    // Step 3: Migrate all tenantSymbols for this tenant
    const tenantSymbols = await (prisma as any).tenantSymbol.findMany({
      where: { tenantId },
      include: { icon: true },
    })

    for (const ts of tenantSymbols) {
      const updates: any = {}

      // name = customName || icon.name
      if (!ts.name) {
        updates.name = ts.customName || ts.icon?.name || 'Unbenannt'
      }

      // svgPath = icon.fileKey
      if (!ts.svgPath && ts.icon?.fileKey) {
        updates.svgPath = ts.icon.fileKey
      }

      // categoryId = default category
      if (!ts.categoryId) {
        updates.categoryId = defaultCategory.id
      }

      // migratedFromIconId = current iconId
      if (!ts.migratedFromIconId) {
        updates.migratedFromIconId = ts.iconId
      }

      if (Object.keys(updates).length > 0) {
        await (prisma as any).tenantSymbol.update({
          where: { id: ts.id },
          data: updates,
        })
        symbolsMigrated++
      }
    }
  }

  console.log(`✅ Done: ${categoriesCreated} categories created, ${symbolsMigrated} symbols migrated`)

  // Verification
  const unmappedCount = await (prisma as any).tenantSymbol.count({
    where: { categoryId: null },
  })

  if (unmappedCount > 0) {
    console.warn(`⚠️  ${unmappedCount} tenantSymbols still have no categoryId!`)
  } else {
    console.log('✅ All tenantSymbols have a category assigned')
  }
}

main()
  .catch((e) => {
    console.error(e)
    process.exit(1)
  })
  .finally(async () => {
    await prisma.$disconnect()
  })