import type { components } from 'api-types'

import { INTERNAL_SCHEMAS } from '@/hooks/useProtectedSchemas'
import { WAREHOUSE_METADATA_SCHEMA } from '@/lib/warehouse'

export type WarehouseSetupBody = components['schemas']['WarehouseSetupBody']
export type WarehouseSetupTarget = WarehouseSetupBody['targets'][number]
export type WarehouseSetupStatus =
  components['schemas']['WarehouseSetupStatusResponse_Output']['setup_status']
export type WarehouseSetupTable =
  components['schemas']['WarehouseSetupStatusResponse_Output']['tables'][number]

export function isWarehouseProvisioned(setupStatus?: WarehouseSetupStatus): boolean {
  return setupStatus === 'complete'
}

export function isWarehouseSettingUp(setupStatus?: WarehouseSetupStatus): boolean {
  return setupStatus === 'setting_up' || setupStatus === 'copying'
}

/** Selection map keyed by `${schema}.${table}`. */
export type SchemaTableSelection = Record<string, boolean>

export type SchemaWithTables = { schema: string; tables: string[] }

export function getSchemaTableKey(schema: string, table: string): string {
  return `${schema}.${table}`
}

/**
 * Internal schemas that still hold product data users legitimately want in their warehouse.
 * Everything else in `INTERNAL_SCHEMAS` is Supabase infrastructure: `vault` (secrets),
 * `pgsodium`, `cron`/`pgmq` bookkeeping, and migration history. These should never be offered as a
 * replication target.
 */
const REPLICABLE_INTERNAL_SCHEMAS = ['auth', 'storage']

const NON_SELECTABLE_SCHEMAS = new Set(
  INTERNAL_SCHEMAS.filter((schema) => !REPLICABLE_INTERNAL_SCHEMAS.includes(schema))
)

/**
 * Postgres schemas Warehouse setup shouldn't offer for replication.
 *
 * `WAREHOUSE_METADATA_SCHEMA` is excluded on top of the infrastructure schemas above: it holds the
 * DuckLake catalog describing the Warehouse itself, so replicating it would feed every Warehouse
 * write back in as more catalog rows to replicate. The platform rejects it server-side too. This
 * just keeps it out of the picker so the user never picks a target that can only fail.
 */
export function isSelectableWarehouseSchema(schemaName: string): boolean {
  return (
    !schemaName.startsWith('pg_') &&
    !NON_SELECTABLE_SCHEMAS.has(schemaName) &&
    schemaName !== WAREHOUSE_METADATA_SCHEMA
  )
}

/**
 * Groups the project's tables under the schemas Warehouse can replicate, sorted by schema name.
 */
export function buildSchemasWithTables(
  schemas: { name: string }[],
  tables: { schema: string; name: string }[]
): SchemaWithTables[] {
  return schemas
    .filter((schema) => isSelectableWarehouseSchema(schema.name))
    .map((schema) => ({
      schema: schema.name,
      tables: tables.filter((table) => table.schema === schema.name).map((table) => table.name),
    }))
    .sort((a, b) => a.schema.localeCompare(b.schema))
}

export function getSelectedTableCount(selection: SchemaTableSelection): number {
  return Object.values(selection).filter(Boolean).length
}

/**
 * Compares two selections by their effective selected keys rather than by reference or raw
 * object shape, since `toggleTable`/`toggleSchema` can write explicit `false` entries that
 * shouldn't count as a difference from a key simply being absent.
 */
export function hasSelectionChanged(
  selection: SchemaTableSelection,
  initialSelection: SchemaTableSelection
): boolean {
  const currentKeys = Object.keys(selection).filter((key) => selection[key])
  const initialKeys = Object.keys(initialSelection).filter((key) => initialSelection[key])
  if (currentKeys.length !== initialKeys.length) return true
  const initialKeySet = new Set(initialKeys)
  return currentKeys.some((key) => !initialKeySet.has(key))
}

/**
 * Seeds the picker's selection from the tables already in the `supabase_warehouse` publication, so
 * editing an existing setup starts from what's actually replicated instead of an empty selection.
 * Schema-level checkboxes derive from these per-table entries, so a schema whose every table is in
 * the publication ends up fully checked on its own.
 */
export function buildSelectionFromPublicationTables(
  publicationTables: { schema: string; name: string }[]
): SchemaTableSelection {
  return publicationTables.reduce<SchemaTableSelection>((selection, table) => {
    selection[getSchemaTableKey(table.schema, table.name)] = true
    return selection
  }, {})
}

/**
 * Tri-state value for a schema's checkbox. Kept here (rather than inlined as nested ternaries in
 * the picker) so the three cases stay explicit and testable.
 */
export function getSchemaCheckedState({
  selectedCount,
  totalCount,
}: {
  selectedCount: number
  totalCount: number
}): boolean | 'indeterminate' {
  if (totalCount > 0 && selectedCount === totalCount) return true
  if (selectedCount > 0) return 'indeterminate'
  return false
}

/**
 * Maps the schema/table checkbox selection down to the API's `targets` shape. A schema whose
 * every currently-known table is selected is sent as a single `{ type: 'schema' }` target
 * (matching the API's semantics of "the currently eligible tables in that schema"); otherwise each
 * selected table is sent individually. Schemas with no tables, or no selected tables, are omitted.
 */
export function buildWarehouseSetupTargets(
  selection: SchemaTableSelection,
  schemasWithTables: SchemaWithTables[]
): WarehouseSetupTarget[] {
  const targets: WarehouseSetupTarget[] = []

  for (const { schema, tables } of schemasWithTables) {
    if (tables.length === 0) continue

    const selectedTables = tables.filter((table) => selection[getSchemaTableKey(schema, table)])
    if (selectedTables.length === 0) continue

    if (selectedTables.length === tables.length) {
      targets.push({ type: 'schema', schema })
    } else {
      selectedTables.forEach((name) => {
        targets.push({ type: 'table', schema, name })
      })
    }
  }

  return targets
}

export function buildRetryTargets(
  tables: Pick<WarehouseSetupTable, 'schema' | 'name'>[] = []
): WarehouseSetupTarget[] {
  return tables.map((table) => ({ type: 'table', schema: table.schema, name: table.name }))
}

export type WarehouseCatalogCredentials = NonNullable<
  components['schemas']['WarehouseCatalogResponse_Output']['credentials']
>