import { v4 as uuid } from 'uuid'
import type { CableType, Catalog, Device, DeviceCategoryDef, DeviceTemplate, PortType, Project } from './types'

export function allPortTypes(catalog: Catalog): PortType[] {
  return catalog.portTypes
}

export function allCableTypes(catalog: Catalog): CableType[] {
  return catalog.cableTypes
}

/** `hiddenPublicIds` is a per-user UI preference (see state/catalogStore.ts),
 *  not part of the catalog data itself — you can hide any public template
 *  from your own palette without affecting anyone else or the shared entry. */
export function allDeviceTemplates(catalog: Catalog, hiddenPublicIds: ReadonlySet<string> = new Set()): DeviceTemplate[] {
  return catalog.deviceTemplates.filter((t) => t.custom || !hiddenPublicIds.has(t.id))
}

/** Public templates the user has hidden, for a "restore" list. */
export function hiddenDeviceTemplates(catalog: Catalog, hiddenPublicIds: ReadonlySet<string>): DeviceTemplate[] {
  return catalog.deviceTemplates.filter((t) => !t.custom && hiddenPublicIds.has(t.id))
}

export function allDeviceCategories(catalog: Catalog): DeviceCategoryDef[] {
  return catalog.deviceCategories
}

export function getDeviceCategory(catalog: Catalog, categoryId: string): DeviceCategoryDef | undefined {
  return allDeviceCategories(catalog).find((c) => c.id === categoryId)
}

/** Friendly label for a category id, falling back to the raw id if it's
 *  somehow unknown (e.g. data from an older export) rather than crashing. */
export function deviceCategoryName(catalog: Catalog, categoryId: string): string {
  return getDeviceCategory(catalog, categoryId)?.name ?? categoryId
}

export function getPortType(catalog: Catalog, portTypeId: string): PortType | undefined {
  return allPortTypes(catalog).find((pt) => pt.id === portTypeId)
}

export function getCableType(catalog: Catalog, cableTypeId: string): CableType | undefined {
  return allCableTypes(catalog).find((ct) => ct.id === cableTypeId)
}

/** The set of connector families a port type will mate with: its own family
 *  plus anything it explicitly lists as also-compatible. Shared with
 *  `compatibility.ts` so "does A connect to B" and "which cable fits" agree. */
export function acceptedFamilies(portType: PortType): Set<string> {
  return new Set([portType.family, ...(portType.compatibleFamilyIds ?? [])])
}

/** A cable's two connector ends as families — `family2` falls back to
 *  `family` for a plain (non-adapter) cable, so it always has exactly two. */
function cableEnds(cableType: CableType): [string, string] {
  return [cableType.family, cableType.family2 ?? cableType.family]
}

/** Does this cable type fit between a port that accepts `sourceFamilies` and
 *  one that accepts `targetFamilies`? Checked in both orientations since a
 *  passive cable (including an adapter with different connectors on each
 *  end) can be plugged in either way around. */
function cableFits(cableType: CableType, sourceFamilies: Set<string>, targetFamilies: Set<string>): boolean {
  const [endA, endB] = cableEnds(cableType)
  if (sourceFamilies.has(endA) && targetFamilies.has(endB)) return true
  if (sourceFamilies.has(endB) && targetFamilies.has(endA)) return true
  return false
}

/** Cable types usable with the given port type at (at least) one end — for
 *  a plain cable that means its family matches; for an adapter cable it's
 *  enough that either end matches. */
export function cableTypesForPortType(catalog: Catalog, portType: PortType): CableType[] {
  const families = acceptedFamilies(portType)
  return allCableTypes(catalog).filter((ct) => {
    const [endA, endB] = cableEnds(ct)
    return families.has(endA) || families.has(endB)
  })
}

/**
 * Cable types valid for a connection between two specific ports. For a plain
 * cable this is the *intersection* of what each end accepts, not the union:
 * a "combo" jack (e.g. a patch bay accepting balanced or unbalanced) paired
 * with a plain balanced port should only offer balanced cable — the plain
 * end still dictates what's electrically correct, even though the combo end
 * alone would accept more. An adapter cable (different connector families on
 * each end — e.g. XLR-to-TRS) is included whenever its two ends line up with
 * the two ports, in either orientation; that's what lets two port types that
 * aren't declared generally compatible still be wired with the right cable,
 * without changing either port type's own compatibility rules.
 */
export function cableTypesForConnection(catalog: Catalog, sourcePortType: PortType, targetPortType: PortType): CableType[] {
  const sourceFamilies = acceptedFamilies(sourcePortType)
  const targetFamilies = acceptedFamilies(targetPortType)
  return allCableTypes(catalog).filter((ct) => cableFits(ct, sourceFamilies, targetFamilies))
}

/** Whether any cable type (built-in or custom) could bridge these two port
 *  types — used to allow a connection even when the port types aren't
 *  declared directly compatible, as long as a specific adapter cable exists. */
export function hasBridgingCableType(catalog: Catalog, sourcePortType: PortType, targetPortType: PortType): boolean {
  return cableTypesForConnection(catalog, sourcePortType, targetPortType).length > 0
}

/**
 * Resolves a set of "also compatible with" picks (port type ids, as checked
 * in the connector-type editor) into the family list to store on a new/edited
 * port type. Crucially this pulls in each picked type's *full* accepted-family
 * set, not just its own bare family — so picking an existing combo/hybrid type
 * (like "1/4" TRS/TS (Balanced or Unbalanced)") inherits everything *that*
 * type accepts, rather than only matching other ports that are that exact
 * combo type. Without this, "compatible with a combo type" wouldn't imply
 * "compatible with what the combo type itself accepts", which is the
 * confusing gap that makes newly-authored combo connectors fail to mate with
 * the plain connectors they were meant to cover.
 */
export function expandCompatibleFamilyIds(selectedPortTypeIds: string[], allTypes: PortType[]): string[] {
  const families = new Set<string>()
  for (const id of selectedPortTypeIds) {
    const portType = allTypes.find((pt) => pt.id === id)
    if (!portType) continue
    for (const family of acceptedFamilies(portType)) families.add(family)
  }
  return [...families]
}

export function createEmptyProject(name = 'Untitled Project'): Project {
  const now = new Date().toISOString()
  return {
    id: uuid(),
    name,
    createdAt: now,
    updatedAt: now,
    devices: [],
    connections: [],
  }
}

/** Instantiates a device on the canvas from a template, deep-copying ports
 *  (with fresh ids) so editing the instance never mutates the template. */
export function createDeviceFromTemplate(template: DeviceTemplate, position: { x: number; y: number }): Device {
  return {
    id: uuid(),
    name: template.name,
    templateId: template.id,
    category: template.category,
    manufacturer: template.manufacturer,
    model: template.model,
    ports: template.ports.map((port) => ({ ...port, id: uuid() })),
    cost: template.cost,
    position,
  }
}

/** "CV Out 1" -> "CV Out 2", "Port 3" -> "Port 4", "Gate In" -> "Gate In 2".
 *  Only increments a number that's the very last thing in the name (trailing
 *  whitespace aside), so labels like `1/4" TS In` aren't misread as ending
 *  in a counter — they just get " 2" appended instead. Used by "clone port". */
export function incrementPortName(name: string): string {
  const match = name.match(/^(.*?)(\d+)\s*$/)
  if (match) {
    const [, prefix, digits] = match
    const next = String(Number(digits) + 1).padStart(digits.length, '0')
    return `${prefix}${next}`
  }
  return `${name.trim()} 2`
}