import type { Curve96 } from '@vpp/domain'
import { qualityGate } from './quality.js'
import type { QualityVerdict } from './quality.js'
import type { SnapshotStore } from './snapshot.js'
import type { CurveRecord, TimeSeriesStore } from './timeseries.js'

/**
 * What a snapshot of an ingested curve contains. Lineage refs point at this,
 * so a decision can be replayed from exactly the input that was accepted —
 * or the input that was quarantined and therefore *not* used.
 */
export interface IngestSnapshot {
  series_id: string
  source: string
  curve: Curve96
  received_at: string
  quality: QualityVerdict
}

export type IngestResult =
  | { accepted: true; record: CurveRecord; snapshot_ref: string }
  | { accepted: false; issues: string[]; snapshot_ref: string }

export interface QuarantineEntry {
  series_id: string
  date: string
  source: string
  issues: string[]
  snapshot_ref: string
  received_at: string
}

export interface IngestionPipelineDeps {
  timeseries: TimeSeriesStore
  snapshots: SnapshotStore
  gate?: (curve: Curve96) => QualityVerdict
  clock?: () => string
}

/**
 * Ingestion pipeline skeleton (docs/05 §3.1 接入管道): every incoming curve
 * is snapshotted first (evidence of what arrived), then passed through the
 * data-quality gate. Passing curves are written to the time-series store;
 * failing curves are tagged and quarantined (不合格数据打标隔离, §3.2) — they
 * never reach a store a forecast skill reads from. Cleaning/alignment stages
 * and the feature-store hand-off are M2 work; this fixes the shape.
 */
export class IngestionPipeline {
  private readonly quarantine: QuarantineEntry[] = []
  private readonly gate: (curve: Curve96) => QualityVerdict
  private readonly clock: () => string

  constructor(private readonly deps: IngestionPipelineDeps) {
    this.gate = deps.gate ?? qualityGate
    this.clock = deps.clock ?? (() => new Date().toISOString())
  }

  ingestCurve(series_id: string, curve: Curve96, source: string): IngestResult {
    const received_at = this.clock()
    const quality = this.gate(curve)
    const snapshot: IngestSnapshot = { series_id, source, curve, received_at, quality }
    const snapshot_ref = this.deps.snapshots.put(snapshot)

    if (!quality.ok) {
      this.quarantine.push({
        series_id,
        date: curve.date,
        source,
        issues: quality.issues,
        snapshot_ref,
        received_at,
      })
      return { accepted: false, issues: quality.issues, snapshot_ref }
    }

    const record = this.deps.timeseries.write(series_id, curve, source)
    return { accepted: true, record, snapshot_ref }
  }

  quarantined(): QuarantineEntry[] {
    return [...this.quarantine]
  }
}