/**
 * Staged form over settings namespace `netxops` + optional credential NETX_API_TOKEN.
 */

import type { Context as ClientContext } from '@deepseek-ai/cordis'
import type {} from '@deepseek-ai/dsh-api-remotes/client'
import type { SettingsScope, SettingsScopeSnapshot } from '@deepseek-ai/dsh-client-ui-settings/client'
import type { SnapshotStore } from './snapshot-store.ts'
import {
  CardForm, textField, booleanField, booleanFieldPersistFalse,
  type CardActions, type CardFieldState, type CardShell,
} from './card-form.ts'
import {
  fetchAlarmPushStatus,
  type AlarmPushRpcCall,
  type AlarmPushStatus,
} from './alarm-push-status-view.ts'
import {
  fetchKbStatus,
  resolveKbPath,
  type KbSnapshot,
} from './kb-status-view.ts'
import { unconfiguredKbSnapshot } from '../netx/kb-manifest.ts'
import {
  EMPTY_IM_DELIVERY_CATALOG,
  fetchImDeliveryCatalog,
  type ImDeliveryCatalog,
} from './im-delivery-catalog.ts'
import {
  downloadAllSessionsExport,
  fetchSessionsExportStatus,
  SessionsExportDownloadError,
  type SessionsExportStatus,
} from './sessions-export-view.ts'
import type { SessionsExportReasonCode } from '../session-export-shared.ts'

export const NETXOPS_NS = 'netxops'
const DEFAULT_TOKEN_REF = 'NETX_API_TOKEN'
const API_TOKEN_FIELD = 'apiToken'
const STATUS_POLL_MS = 2_000

export interface NetxopsSettings {
  apiUrl?: string
  lang?: string
  tokenCredentialRef?: string
  alarmPushEnabled?: boolean
  alarmDeliverDsh?: boolean
  alarmDeliverIm?: boolean
  /** JSON array of `{ botId, targetId }` — multi WhatsApp / IM sinks. */
  imTargets?: string
  imBotId?: string
  imTargetId?: string
  groupOpsInPreset?: boolean
  groupOpsPublic?: boolean
  groupTopologyInPreset?: boolean
  groupTopologyPublic?: boolean
  nmsProvider?: string
  /** Operator-subset knowledge package root (Host-local path). */
  kbRoot?: string
  /** Mount `_skills/kb-*` into Netx Ops preset. */
  groupKbInPreset?: boolean
  /** Publish `_skills/kb-*` to other presets. */
  groupKbPublic?: boolean
}

interface CredentialState {
  ref: string
  configured: boolean
  writable: boolean
  remoteReady: boolean
}

export interface NetxopsCardState extends CardShell {
  apiUrl: CardFieldState
  lang: CardFieldState
  groupOpsInPreset: CardFieldState
  groupOpsPublic: CardFieldState
  groupTopologyInPreset: CardFieldState
  groupTopologyPublic: CardFieldState
  nmsProvider: CardFieldState
  kbRoot: CardFieldState
  groupKbInPreset: CardFieldState
  groupKbPublic: CardFieldState
  alarmPushEnabled: CardFieldState
  alarmDeliverDsh: CardFieldState
  alarmDeliverIm: CardFieldState
  imTargets: CardFieldState
  imBotId: CardFieldState
  imTargetId: CardFieldState
  apiToken: CardFieldState
  apiTokenConfigured: boolean
  apiTokenWritable: boolean
  apiTokenRemoteReady: boolean
  /** Host WSS status when Connection RPC is available; otherwise null. */
  alarmPushStatus: AlarmPushStatus | null
  /** Latest KB snapshot (saved root, or live preview while editing). */
  kbStatus: KbSnapshot | null
  /** Soft-injected `remote.directoryPicker` is available. */
  kbDirectoryPickerReady: boolean
  /** Last browse / resolve UI error (picker refuse, RPC miss, …). */
  kbUiError: string | null
  /** Saved IM delivery targets for the picker (soft-depends on dsh-im-ops). */
  imDeliveryCatalog: ImDeliveryCatalog
  /** Bulk session-export readiness from Host RPC; null when RPC is absent. */
  sessionsExportStatus: SessionsExportStatus | null
  /** In-flight bulk export download. */
  sessionsExportBusy: boolean
  /** Last bulk export error (stable code + optional detail for locale templates). */
  sessionsExportError: {
    code: SessionsExportReasonCode
    status?: number
    detail: string
    fallback: string
  } | null
  /** Last successful download filename. */
  sessionsExportLastFile: string | null
}

export interface NetxopsCardFace extends CardActions {
  hooks: {
    netxopsCard: SnapshotStore<NetxopsCardState>
  }
  /** Download every durable session on this Host as one ZIP. */
  exportAllSessions: () => void
  /** Open the Host directory picker and write the chosen path into kbRoot. */
  browseKbRoot: () => void
}

type DirectoryPickerRemote = {
  pick: (signal?: AbortSignal) => Promise<string | null>
}

type CredentialsRemote = {
  describe: (refs: string[]) => Promise<{ ok: boolean; value?: Record<string, { configured?: boolean; writable?: boolean } | undefined> }>
  set: (ref: string, value: string) => Promise<unknown>
}

export class NetxopsCardController {
  private readonly form: CardForm<NetxopsSettings>
  private readonly store: SnapshotStore<NetxopsCardState>
  private credential: CredentialState = {
    ref: '',
    configured: false,
    writable: false,
    remoteReady: false,
  }
  private rpcCall: AlarmPushRpcCall | undefined
  private alarmPushStatus: AlarmPushStatus | null = null
  private kbStatus: KbSnapshot | null = null
  private kbPreview: KbSnapshot | null = null
  private kbDirectoryPicker: DirectoryPickerRemote | undefined
  private kbBrowseInFlight = false
  private kbStatusInFlight = false
  private kbUiError: string | null = null
  private imDeliveryCatalog: ImDeliveryCatalog = { ...EMPTY_IM_DELIVERY_CATALOG }
  private sessionsExportStatus: SessionsExportStatus | null = null
  private sessionsExportBusy = false
  private sessionsExportError: NetxopsCardState['sessionsExportError'] = null
  private sessionsExportLastFile: string | null = null
  private pollTimer: ReturnType<typeof setInterval> | undefined
  private pollInFlight = false
  private catalogInFlight = false
  private exportStatusInFlight = false
  private exportInFlight: Promise<void> | undefined

  constructor(
    private readonly scope: SettingsScope<NetxopsSettings>,
    private readonly ctx: ClientContext,
  ) {
    this.form = new CardForm(
      scope,
      [
        textField('apiUrl'),
        textField('lang'),
        textField('nmsProvider'),
        textField('kbRoot'),
        booleanFieldPersistFalse('groupOpsInPreset'),
        booleanField('groupOpsPublic'),
        booleanField('groupTopologyInPreset'),
        booleanField('groupTopologyPublic'),
        booleanFieldPersistFalse('groupKbInPreset'),
        booleanField('groupKbPublic'),
        booleanField('alarmPushEnabled'),
        booleanFieldPersistFalse('alarmDeliverDsh'),
        booleanField('alarmDeliverIm'),
        textField('imTargets'),
        textField('imBotId'),
        textField('imTargetId'),
      ],
      [{ field: API_TOKEN_FIELD, write: text => this.writeToken(text) }],
    )
    this.store = this.form.bind(() => this.projection())
    scope.subscribe(() => {
      void this.readCredential()
      void this.refreshKbPreview()
    })
    void this.readCredential()
  }

  /** Toggle when soft-injected `remote.credentials` arrives / leaves. */
  setCredentialsAvailable(ready: boolean): void {
    if (this.credential.remoteReady === ready) return
    this.credential = {
      ...this.credential,
      remoteReady: ready,
      writable: ready,
    }
    this.store.set(this.projection())
    if (ready) void this.readCredential()
  }

  /**
   * Soft-inject Host Connection RPC used to read alarm-push WSS status + KB status.
   * @param call - `ctx.connection.rpc.call`, or undefined when connection leaves.
   */
  setAlarmPushRpc(call: AlarmPushRpcCall | undefined): void {
    this.rpcCall = call
    if (call === undefined) {
      this.stopStatusPoll()
      let changed = false
      if (this.alarmPushStatus !== null) {
        this.alarmPushStatus = null
        changed = true
      }
      if (this.kbStatus !== null || this.kbPreview !== null) {
        this.kbStatus = null
        this.kbPreview = null
        changed = true
      }
      if (this.imDeliveryCatalog.options.length > 0 || this.imDeliveryCatalog.available !== true) {
        this.imDeliveryCatalog = { ...EMPTY_IM_DELIVERY_CATALOG }
        changed = true
      }
      if (this.sessionsExportStatus !== null) {
        this.sessionsExportStatus = null
        changed = true
      }
      if (changed) this.store.set(this.projection())
      return
    }
    this.startStatusPoll()
    void this.refreshAlarmPushStatus()
    void this.refreshKbStatus()
    void this.refreshKbPreview()
    void this.refreshImDeliveryCatalog()
    void this.refreshSessionsExportStatus()
  }

  /**
   * Soft-inject `remote.directoryPicker` for the knowledge-base browse button.
   */
  setDirectoryPicker(picker: DirectoryPickerRemote | undefined): void {
    const ready = picker !== undefined
    if (this.kbDirectoryPicker === picker && (this.kbDirectoryPicker !== undefined) === ready) {
      return
    }
    this.kbDirectoryPicker = picker
    this.store.set(this.projection())
  }

  private startStatusPoll(): void {
    if (this.pollTimer !== undefined) return
    this.pollTimer = setInterval(() => {
      void this.refreshAlarmPushStatus()
      void this.refreshKbStatus()
      void this.refreshImDeliveryCatalog()
      void this.refreshSessionsExportStatus()
    }, STATUS_POLL_MS)
  }

  private stopStatusPoll(): void {
    if (this.pollTimer === undefined) return
    clearInterval(this.pollTimer)
    this.pollTimer = undefined
  }

  private async refreshAlarmPushStatus(): Promise<void> {
    const call = this.rpcCall
    if (call === undefined || this.pollInFlight) return
    this.pollInFlight = true
    try {
      const next = await fetchAlarmPushStatus(call)
      const prev = this.alarmPushStatus
      if (
        prev
        && prev.phase === next.phase
        && prev.enabled === next.enabled
        && prev.wsUrl === next.wsUrl
        && prev.detail === next.detail
        && prev.lastError === next.lastError
        && prev.lastConnectedAt === next.lastConnectedAt
      ) return
      this.alarmPushStatus = next
      this.store.set(this.projection())
    } catch {
      // Keep last good snapshot; next poll retries.
    } finally {
      this.pollInFlight = false
    }
  }

  private async refreshImDeliveryCatalog(): Promise<void> {
    const call = this.rpcCall
    if (call === undefined || this.catalogInFlight) return
    this.catalogInFlight = true
    try {
      const next = await fetchImDeliveryCatalog(call)
      const prev = this.imDeliveryCatalog
      const sameOptions = prev.options.length === next.options.length
        && prev.options.every((row, index) => {
          const other = next.options[index]
          return other
            && row.botId === other.botId
            && row.targetId === other.targetId
            && row.name === other.name
            && row.channel === other.channel
        })
      if (
        prev.available === next.available
        && prev.hint === next.hint
        && sameOptions
      ) return
      this.imDeliveryCatalog = next
      this.store.set(this.projection())
    } catch {
      // Keep last good snapshot; next poll retries.
    } finally {
      this.catalogInFlight = false
    }
  }

  private async refreshSessionsExportStatus(): Promise<void> {
    const call = this.rpcCall
    if (call === undefined || this.exportStatusInFlight) return
    this.exportStatusInFlight = true
    try {
      const next = await fetchSessionsExportStatus(call)
      const prev = this.sessionsExportStatus
      if (
        prev
        && prev.available === next.available
        && prev.sessionCount === next.sessionCount
        && prev.supportsRawArtifacts === next.supportsRawArtifacts
        && prev.reason === next.reason
      ) return
      this.sessionsExportStatus = next
      this.store.set(this.projection())
    } catch {
      // Keep last good snapshot; next poll retries.
    } finally {
      this.exportStatusInFlight = false
    }
  }

  private async refreshKbStatus(): Promise<void> {
    const call = this.rpcCall
    if (call === undefined || this.kbStatusInFlight) return
    this.kbStatusInFlight = true
    try {
      const next = await fetchKbStatus(call)
      const prev = this.kbStatus
      if (
        prev
        && prev.status === next.status
        && prev.realRoot === next.realRoot
        && prev.operatorName === next.operatorName
        && prev.country === next.country
        && prev.version === next.version
        && prev.errorMessage === next.errorMessage
      ) return
      this.kbStatus = next
      this.store.set(this.projection())
    } catch {
      // Keep last good snapshot; next poll retries.
    } finally {
      this.kbStatusInFlight = false
    }
  }

  private async refreshKbPreview(): Promise<void> {
    const call = this.rpcCall
    if (call === undefined) return
    const draft = this.form.field('kbRoot').text.trim()
    const saved = (this.scope.getSnapshot().value?.kbRoot ?? '').trim()
    if (draft === saved) {
      if (this.kbPreview !== null) {
        this.kbPreview = null
        this.store.set(this.projection())
      }
      return
    }
    try {
      const next = draft === ''
        ? unconfiguredKbSnapshot()
        : await resolveKbPath(call, draft)
      const prev = this.kbPreview
      if (
        prev
        && prev.status === next.status
        && prev.realRoot === next.realRoot
        && prev.operatorName === next.operatorName
        && prev.country === next.country
        && prev.version === next.version
        && prev.errorMessage === next.errorMessage
      ) return
      this.kbPreview = next
      this.store.set(this.projection())
    } catch {
      // Keep last preview; edits retry via scope subscribe.
    }
  }

  /**
   * Open the Host OS directory chooser (or /api directoryPicker/pick fallback)
   * and write the path into kbRoot.
   */
  browseKbRoot(): void {
    if (this.kbBrowseInFlight) return
    this.kbBrowseInFlight = true
    this.kbUiError = null
    this.store.set(this.projection())

    const applyPath = (path: string): void => {
      this.form.actions().edit('kbRoot', path)
      void this.refreshKbPreview()
      // Selecting a folder should land immediately — don't require a separate Save.
      void this.form.save().then(() => {
        void this.refreshKbStatus()
        void this.refreshKbPreview()
      })
    }

    const fail = (error: unknown): void => {
      this.kbUiError = error instanceof Error ? error.message : String(error)
      this.store.set(this.projection())
    }

    /**
     * `remote.directoryPicker.pick()` returns a Typert Result `{ ok, value }`,
     * not a bare string (see dsh ui-workspace Navigation.pickDirectory).
     */
    const acceptPickResult = (result: unknown): void => {
      const path = unwrapDirectoryPickResult(result)
      if (path === null) return // user cancelled
      if (path === undefined) {
        fail(`unexpected directoryPicker result: ${safeJson(result)}`)
        return
      }
      applyPath(path)
    }

    const picker = this.kbDirectoryPicker
    if (picker !== undefined) {
      void picker.pick()
        .then(acceptPickResult)
        .catch(fail)
        .finally(() => {
          this.kbBrowseInFlight = false
          this.store.set(this.projection())
        })
      return
    }

    // Fallback: workspace controller remote verb on the Host /api channel.
    const call = this.rpcCall
    if (call === undefined) {
      this.kbBrowseInFlight = false
      this.kbUiError = 'directory picker unavailable — paste an absolute folder path and Save'
      this.store.set(this.projection())
      return
    }
    void call('/api', 'directoryPicker/pick', { args: {} })
      .then(acceptPickResult)
      .catch(fail)
      .finally(() => {
        this.kbBrowseInFlight = false
        this.store.set(this.projection())
      })
  }

  /**
   * Download every durable session as one ZIP through the browser download manager.
   */
  exportAllSessions(): void {
    if (this.exportInFlight !== undefined || this.sessionsExportBusy) return
    if (this.sessionsExportStatus?.available !== true) return
    this.sessionsExportBusy = true
    this.sessionsExportError = null
    this.store.set(this.projection())
    this.exportInFlight = downloadAllSessionsExport()
      .then((result) => {
        this.sessionsExportLastFile = result.filename
        this.sessionsExportError = null
      })
      .catch((error: unknown) => {
        if (error instanceof SessionsExportDownloadError) {
          this.sessionsExportError = {
            code: error.code,
            status: error.status,
            detail: error.detail,
            fallback: error.message,
          }
          return
        }
        this.sessionsExportError = {
          code: 'http_failed',
          detail: '',
          fallback: error instanceof Error ? error.message : String(error),
        }
      })
      .finally(() => {
        this.sessionsExportBusy = false
        this.exportInFlight = undefined
        this.store.set(this.projection())
        void this.refreshSessionsExportStatus()
      })
  }

  private projection(): NetxopsCardState {
    return {
      ...this.form.shell(),
      apiUrl: this.form.field('apiUrl'),
      lang: this.form.field('lang'),
      nmsProvider: this.form.field('nmsProvider'),
      kbRoot: this.form.field('kbRoot'),
      groupOpsInPreset: this.form.field('groupOpsInPreset'),
      groupOpsPublic: this.form.field('groupOpsPublic'),
      groupTopologyInPreset: this.form.field('groupTopologyInPreset'),
      groupTopologyPublic: this.form.field('groupTopologyPublic'),
      groupKbInPreset: this.form.field('groupKbInPreset'),
      groupKbPublic: this.form.field('groupKbPublic'),
      alarmPushEnabled: this.form.field('alarmPushEnabled'),
      alarmDeliverDsh: this.form.field('alarmDeliverDsh'),
      alarmDeliverIm: this.form.field('alarmDeliverIm'),
      imTargets: this.form.field('imTargets'),
      imBotId: this.form.field('imBotId'),
      imTargetId: this.form.field('imTargetId'),
      apiToken: this.form.field(API_TOKEN_FIELD),
      apiTokenConfigured: this.credential.configured,
      apiTokenWritable: this.credential.remoteReady && this.credential.writable,
      apiTokenRemoteReady: this.credential.remoteReady,
      alarmPushStatus: this.alarmPushStatus,
      kbStatus: this.kbPreview ?? this.kbStatus,
      kbDirectoryPickerReady: this.kbDirectoryPicker !== undefined || this.rpcCall !== undefined,
      kbUiError: this.kbUiError,
      imDeliveryCatalog: this.imDeliveryCatalog,
      sessionsExportStatus: this.sessionsExportStatus,
      sessionsExportBusy: this.sessionsExportBusy,
      sessionsExportError: this.sessionsExportError,
      sessionsExportLastFile: this.sessionsExportLastFile,
    }
  }

  private credentials(): CredentialsRemote | undefined {
    return this.ctx.get('remote.credentials') as CredentialsRemote | undefined
  }

  private async readCredential(): Promise<void> {
    const ref = refOf(this.scope.getSnapshot())
    const api = this.credentials()
    if (api === undefined) {
      if (ref !== this.credential.ref || this.credential.remoteReady) {
        this.credential = {
          ref,
          configured: false,
          writable: false,
          remoteReady: false,
        }
        this.store.set(this.projection())
      }
      return
    }
    if (ref !== this.credential.ref) {
      this.credential = { ref, configured: false, writable: true, remoteReady: true }
      this.store.set(this.projection())
    }
    const response = await api.describe([ref])
    if (!response.ok || ref !== refOf(this.scope.getSnapshot())) return
    const view = response.value?.[ref]
    const next: CredentialState = {
      ref,
      configured: view?.configured ?? false,
      writable: view?.writable ?? true,
      remoteReady: true,
    }
    if (
      next.configured === this.credential.configured
      && next.writable === this.credential.writable
      && next.remoteReady === this.credential.remoteReady
    ) return
    this.credential = next
    this.store.set(this.projection())
  }

  refreshCredential(ref: string): void {
    if (ref !== this.credential.ref) return
    void this.readCredential()
  }

  inject(): NetxopsCardFace {
    const actions = this.form.actions()
    return {
      hooks: { netxopsCard: this.store },
      ...actions,
      edit: (field, text) => {
        actions.edit(field, text)
        if (field === 'kbRoot') void this.refreshKbPreview()
      },
      discard: () => {
        actions.discard()
        void this.refreshKbPreview()
      },
      resetField: (field) => {
        actions.resetField(field)
        if (field === 'kbRoot') void this.refreshKbPreview()
      },
      exportAllSessions: () => { this.exportAllSessions() },
      browseKbRoot: () => { this.browseKbRoot() },
    }
  }

  private async writeToken(value: string): Promise<boolean> {
    const api = this.credentials()
    if (api === undefined) return false
    await api.set(refOf(this.scope.getSnapshot()), value)
    await this.readCredential()
    return this.credential.configured
  }
}

function refOf(snapshot: SettingsScopeSnapshot<NetxopsSettings>): string {
  const declared = snapshot.value?.tokenCredentialRef
  return declared !== undefined && declared.length > 0 ? declared : DEFAULT_TOKEN_REF
}

/**
 * Normalize directoryPicker pick outcomes.
 * @returns trimmed path; `null` = cancelled; `undefined` = unparseable.
 */
function unwrapDirectoryPickResult(result: unknown): string | null | undefined {
  if (result === null) return null
  if (typeof result === 'string') {
    const trimmed = result.trim()
    return trimmed === '' ? null : trimmed
  }
  if (result === null || typeof result !== 'object' || Array.isArray(result)) return undefined
  const row = result as {
    ok?: boolean
    value?: unknown
    error?: { message?: string }
  }
  if (row.ok === false) {
    throw new Error(row.error?.message || 'directoryPicker/pick failed')
  }
  if ('value' in row) {
    if (row.value === null) return null
    if (typeof row.value === 'string') {
      const trimmed = row.value.trim()
      return trimmed === '' ? null : trimmed
    }
    return undefined
  }
  return undefined
}

function safeJson(value: unknown): string {
  try {
    return JSON.stringify(value)
  } catch {
    return String(value)
  }
}