import { z } from 'zod'
import { AwardNotice, Curve96, ExecutionReport, HumanBidRecord, MarketDate, MeteringRecord, RouterDecision } from '@vpp/domain'
import type { EventEnvelope, KpiReport, ShadowDayRecord } from '@vpp/domain'
import { shadowClearing } from '@vpp/services'
import { ENVELOPE_REVIEW_STEP_ID } from './workflows/envelope-review.js'
import { LlmUnavailable } from './llm.js'
import type { Runtime } from './runtime.js'
import { ENVELOPE_GATE_STEP_ID } from './workflows/proposal-lifecycle.js'
import type { ResumeDecision } from './workflows/proposal-lifecycle.js'

/**
 * Trigger service (docs/02 §1, docs/09 §1): three sources, one shape —
 * "instantiate template X with params Y".
 *   scheduled: cron entries (D-1 06:00 situation, 08:00 bid) — no LLM in the path
 *   event:     bus consumers with deterministic rules
 *   manual:    the router agent turns free text into a RouterDecision
 *              (a template id + params, never a new flow); on LLM outage the
 *              operator picks the template explicitly.
 * Approval is a resume on the lifecycle run (docs/09 §2).
 */
export type ScheduledTemplate = 'dayAheadSituation' | 'dayAheadBid' | 'shadowClearing' | 'shadowClose'

export interface ScheduleEntry {
  id: string
  /** 'HH:MM' Asia/Shanghai */
  localTime: string
  workflow: ScheduledTemplate
  /** Market date relative to the local day the entry fires on: +1 = tomorrow (D-1 stages), -1 = yesterday (D+1 close). */
  marketDateOffsetDays?: 1 | -1
}

export const DEFAULT_SCHEDULE: ScheduleEntry[] = [
  { id: 'situation-0600', localTime: '06:00', workflow: 'dayAheadSituation' }, // docs/07 D-1 06:00
  { id: 'bid-0800', localTime: '08:00', workflow: 'dayAheadBid' }, // docs/07 D-1 08:00; window is OPEN-QUESTION A1
]

/** Shadow mode adds the simulated market answer (docs/07 D-1 16:00) and the D+1 close (execution → metering → review → scoring). */
export const SHADOW_SCHEDULE: ScheduleEntry[] = [
  ...DEFAULT_SCHEDULE,
  { id: 'shadow-clearing-1600', localTime: '16:00', workflow: 'shadowClearing' }, // docs/07 D-1 16:00; publication time is OPEN-QUESTION A1
  { id: 'shadow-close-0200', localTime: '02:00', workflow: 'shadowClose', marketDateOffsetDays: -1 }, // D+1 02:00 for D
]

export const marketDateFor = (nowIso: string, offsetDays: number): string => {
  const shanghai = new Date(new Date(nowIso).getTime() + 8 * 3_600_000)
  shanghai.setUTCDate(shanghai.getUTCDate() + offsetDays)
  return shanghai.toISOString().slice(0, 10)
}

export const nextMarketDate = (nowIso: string): string => marketDateFor(nowIso, 1)

/** Live-data feed (docs/06 §3): actual curves for a market date; each goes through the quality gate. */
export const MarketDataInput = z.object({
  market_date: MarketDate,
  load_mw: z.array(z.string()).length(96).optional(),
  pv_mw: z.array(z.string()).length(96).optional(),
  price_yuan_per_mwh: z.array(z.string()).length(96).optional(),
  source: z.string().min(1).optional(),
})
export type MarketDataInput = z.infer<typeof MarketDataInput>

export class TriggerService {
  private timer: NodeJS.Timeout | null = null
  private readonly firedToday = new Set<string>()
  private readonly unsubscribe: Array<() => void> = []

  constructor(
    private readonly rt: Runtime,
    private readonly schedule: ScheduleEntry[] = rt.ctx.config.mode === 'SHADOW' ? SHADOW_SCHEDULE : DEFAULT_SCHEDULE,
  ) {}

  // ---- scheduled ---------------------------------------------------------

  /** Polls the clock; fires each entry once per local day. Deterministic, LLM-free. */
  startScheduler(pollMs = 30_000): void {
    if (this.timer) return
    this.timer = setInterval(() => void this.tick(), pollMs)
    this.timer.unref()
  }

  stop(): void {
    if (this.timer) clearInterval(this.timer)
    this.timer = null
    for (const u of this.unsubscribe) u()
  }

  async tick(nowIso = this.rt.ctx.clock()): Promise<string[]> {
    const local = new Date(new Date(nowIso).getTime() + 8 * 3_600_000)
    const hhmm = local.toISOString().slice(11, 16)
    const day = local.toISOString().slice(0, 10)
    const fired: string[] = []
    for (const entry of this.schedule) {
      const key = `${day}:${entry.id}`
      if (hhmm >= entry.localTime && !this.firedToday.has(key)) {
        const marketDate = marketDateFor(nowIso, entry.marketDateOffsetDays ?? 1)
        try {
          await this.fire(entry, marketDate)
          this.firedToday.add(key)
          fired.push(entry.id)
        } catch (e) {
          // Late data (e.g. no clearing price yet) is normal in a live shadow run: record it and retry next tick.
          this.rt.ctx.events.append({ event_type: 'ScheduledTriggerFailed', payload: { entry: entry.id, workflow: entry.workflow, market_date: marketDate, error: (e as Error).message }, correlation_id: `schedule-${entry.id}` })
        }
      }
    }
    return fired
  }

  private async fire(entry: ScheduleEntry, marketDate: string): Promise<void> {
    if (entry.workflow === 'shadowClearing') await this.shadowClearing(marketDate)
    else if (entry.workflow === 'shadowClose') await this.shadowClose(marketDate)
    else await this.startTemplate(entry.workflow, { market_date: marketDate }, 'SCHEDULED', entry.id)
  }

  // ---- event -------------------------------------------------------------

  /**
   * Deterministic event rules. A SituationPublished with EXTREME risk starts the
   * abnormal-day protocol (docs/13 §1): envelopes are off for that market date —
   * every proposal goes to a human — and a case is opened for the review.
   */
  startEventConsumers(): void {
    this.unsubscribe.push(
      this.rt.ctx.events.subscribe('SituationPublished', (evt: EventEnvelope) => {
        const payload = evt.payload as { report: { market_date: string; risk_level: string; id: string } }
        if (payload.report.risk_level === 'EXTREME') {
          this.rt.ctx.breakers.declareAbnormalDay(payload.report.market_date, { id: 'runtime', role: 'system' }, `situation ${payload.report.id}: risk EXTREME (OPEN-QUESTION B7 triggers)`, this.rt.ctx.clock())
          this.rt.ctx.caseDesk.open({
            id: this.rt.ctx.newId('case'),
            kind: 'ADHOC_ANALYSIS',
            objective: `Abnormal-day protocol review for ${payload.report.market_date} (situation ${payload.report.id})`,
            owner: 'user-ops-lead', // OPEN-QUESTION B8
            deadline: `${payload.report.market_date}T00:00:00Z`,
          })
        }
      }),
    )
  }

  /** Trading-platform adapter stand-in: an award arrives → ledger + decomposition (docs/07 D-1 16:00). */
  async onAward(award: AwardNotice) {
    const a = AwardNotice.parse(award)
    this.rt.ctx.events.append({ event_type: 'AwardReceived', payload: a, correlation_id: a.id })
    const wf = this.rt.mastra.getWorkflow('awardDecomposition')
    const run = await wf.createRun()
    const result = await run.start({ inputData: { award: a } })
    if (result.status === 'failed') throw result.error
    return { run_id: run.runId, result: result.status === 'success' ? result.result : null, status: result.status }
  }

  /** Execution engine / edge feedback stand-in: execution reports are evidence for review and potential assessment. */
  onExecutionReports(reports: ExecutionReport[]) {
    for (const r of reports) {
      const parsed = ExecutionReport.parse(r)
      this.rt.ctx.executionReports.put(parsed)
      this.rt.ctx.events.append({ event_type: 'ExecutionReport', payload: parsed, correlation_id: parsed.dispatch_proposal_digest })
    }
  }

  /** Live-data feed: actual curves for a market date through the ingestion pipeline (quality gate + evidence snapshot). */
  onMarketData(input: MarketDataInput) {
    const m = MarketDataInput.parse(input)
    const source = m.source ?? 'market-data-feed'
    const series: Array<[string, string[] | undefined]> = [['load:aggregate', m.load_mw], ['pv:aggregate', m.pv_mw], ['price:da', m.price_yuan_per_mwh]]
    const accepted: string[] = []
    const quarantined: Array<{ series: string; issues: string[] }> = []
    for (const [id, values] of series) {
      if (!values) continue
      const curve = Curve96.parse({ interval_minutes: 15, date: m.market_date, values })
      const r = this.rt.ctx.ingestion.ingestCurve(id, curve, source)
      if (r.accepted) accepted.push(id)
      else quarantined.push({ series: id, issues: r.issues })
    }
    this.rt.ctx.events.append({ event_type: 'MarketDataIngested', payload: { market_date: m.market_date, source, accepted, quarantined }, correlation_id: `market-data-${m.market_date}` })
    return { market_date: m.market_date, accepted, quarantined }
  }

  /** The human trader's actual submission for a market date (shadow comparison baseline). */
  onHumanBid(record: HumanBidRecord) {
    const h = HumanBidRecord.parse(record)
    this.rt.ctx.humanBids.put(h)
    this.rt.ctx.events.append({ event_type: 'HumanBidRecorded', payload: { id: h.id, market_date: h.market_date, source: h.source }, correlation_id: `shadow-${h.market_date}` })
    return h
  }

  /**
   * Shadow market answer (docs/07 D-1 16:00 in shadow mode): the released
   * shadow bid is cleared against the actual day-ahead price and the resulting
   * AwardNotice goes down the normal award path. Idempotent per bid digest.
   */
  async shadowClearing(marketDate: string) {
    const ctx = this.rt.ctx
    const bid = ctx.caseDesk.proposals
      .list()
      .map((r) => r.value)
      .filter((p) => p.type === 'BID' && p.payload.market_date === marketDate && p.status === 'RELEASED')
      .sort((a, b) => (a.created_at < b.created_at ? -1 : 1))
      .at(-1)
    if (!bid) {
      ctx.events.append({ event_type: 'ShadowClearingSkipped', payload: { market_date: marketDate, reason: 'no RELEASED bid for the day' }, correlation_id: `shadow-${marketDate}` })
      return null
    }
    const existing = ctx.awards.list().find((a) => a.value.bid_proposal_digest === bid.digest)
    if (existing) return { award: existing.value, decomposition: null }
    const price = ctx.timeseries.latest('price:da', marketDate)?.curve
    if (!price) throw new Error(`no clearing price for ${marketDate} yet — ingest market data first`)
    const award = shadowClearing(bid, price, { id: `award-shadow-${marketDate}`, now: ctx.clock() })
    ctx.events.append({ event_type: 'ShadowCleared', payload: { market_date: marketDate, award_id: award.id, bid_proposal_digest: bid.digest, awarded_mwh: award.awarded_mwh.values.reduce((s, v) => s + Number(v), 0).toFixed(3) }, correlation_id: `shadow-${marketDate}` })
    const decomposition = await this.onAward(award)
    return { award, decomposition }
  }

  /** D+1 close for a shadow day: simulated execution → metering → review → comparison → KPI (shadow-close workflow). */
  async shadowClose(marketDate: string): Promise<{ run_id: string; record: ShadowDayRecord; kpi: KpiReport; review_ran: boolean; execution_simulated: boolean }> {
    const wf = this.rt.mastra.getWorkflow('shadowClose')
    const run = await wf.createRun()
    const result = await run.start({ inputData: { market_date: marketDate } })
    if (result.status === 'failed') throw result.error
    if (result.status !== 'success') throw new Error(`shadow close for ${marketDate} ended ${result.status}`)
    return { run_id: run.runId, ...result.result }
  }

  /** Metering adapter stand-in: D+1 metering arrives → review workflow (docs/07 D+1). */
  async onMetering(record: MeteringRecord) {
    const m = MeteringRecord.parse(record)
    this.rt.ctx.metering.put(m)
    this.rt.ctx.events.append({ event_type: 'MeteringArrived', payload: m, correlation_id: m.id })
    const wf = this.rt.mastra.getWorkflow('review')
    const run = await wf.createRun()
    const result = await run.start({ inputData: { market_date: m.market_date } })
    if (result.status === 'failed') throw result.error
    return { run_id: run.runId, result: result.status === 'success' ? result.result : null }
  }

  // ---- manual ------------------------------------------------------------

  async route(message: string): Promise<RouterDecision> {
    const prompt = `Operator request: "${message}". Today (UTC) is ${this.rt.ctx.clock()}. Default market_date is ${nextMarketDate(this.rt.ctx.clock())}.`
    try {
      return await this.rt.ctx.llm.structured('router-agent', prompt, RouterDecision)
    } catch (e) {
      if (e instanceof LlmUnavailable) throw new LlmUnavailable('router needs an LLM; pick a template explicitly via startTemplate')
      throw e
    }
  }

  async manual(message: string): Promise<{ decision: RouterDecision; run_id: string | null }> {
    const decision = await this.route(message)
    if (decision.workflow_id === 'adhoc-analysis') return { decision, run_id: null }
    const run_id = await this.startTemplate(decision.workflow_id === 'day-ahead-bid' ? 'dayAheadBid' : 'dayAheadSituation', decision.params, 'MANUAL', 'router')
    return { decision, run_id }
  }

  async startTemplate(workflow: 'dayAheadSituation' | 'dayAheadBid', params: { market_date: string }, trigger: 'SCHEDULED' | 'EVENT' | 'MANUAL', source: string): Promise<string> {
    const wf = this.rt.mastra.getWorkflow(workflow)
    const run = await wf.createRun()
    this.rt.ctx.events.append({ event_type: 'WorkflowTriggered', payload: { workflow, params, trigger, source, run_id: run.runId }, correlation_id: run.runId })
    const result = await run.start({ inputData: params })
    this.rt.ctx.events.append({ event_type: 'WorkflowFinished', payload: { workflow, run_id: run.runId, status: result.status }, correlation_id: run.runId })
    if (result.status === 'failed') throw result.error
    return run.runId
  }

  // ---- approval = resume -------------------------------------------------

  async decide(runId: string, decision: ResumeDecision) {
    const pending = this.rt.ctx.caseDesk.pending.list().find((p) => p.value.run_id === runId)?.value
    if (pending?.workflow === 'envelopeReview') {
      const run = await this.rt.mastra.getWorkflow('envelopeReview').createRun({ runId })
      const res = await run.resume({ step: ENVELOPE_REVIEW_STEP_ID, resumeData: decision })
      return res.status === 'success' ? { status: 'success' as const, result: { outcome: res.result.applied ? ('RELEASED' as const) : ('REJECTED' as const), ...res.result } } : res
    }
    const wf = this.rt.mastra.getWorkflow('proposalLifecycle')
    const run = await wf.createRun({ runId })
    return run.resume({ step: ENVELOPE_GATE_STEP_ID, resumeData: decision })
  }
}