import type { PrismaClient, RoundStatus } from '@prisma/client'
import { createNotification, NotificationTypes } from './in-app-notification'
import { getPresignedUrl } from '@/lib/minio'

export type FinalDocRequirement = {
  id: string
  name: string
  acceptedMimeTypes: string[]
  isRequired: boolean
  uploaded: boolean
  file: { id: string; fileName: string; mimeType: string; bucket: string; objectKey: string; createdAt: Date } | null
}

export type FinalDocumentStatus = {
  roundId: string
  roundName: string
  deadline: Date | null
  deadlinePassed: boolean
  requirements: FinalDocRequirement[]
  allRequiredUploaded: boolean
}

// A LIVE_FINAL round is "open for documents" during the lead-up — while it is
// DRAFT (not yet opened for the live event) or ACTIVE — but not once CLOSED/
// finalized. This decouples document upload + judge review from the ceremony
// actually starting, so the Grand Final round can stay DRAFT until event time.
const OPEN_FINALE_STATUS: RoundStatus[] = ['ROUND_DRAFT', 'ROUND_ACTIVE']

/** Resolve the program's LIVE_FINAL round while it is open for documents (DRAFT or ACTIVE, not closed/finalized), or null. */
export async function getOpenFinaleRound(prisma: PrismaClient, programId: string) {
  return prisma.round.findFirst({
    where: { competition: { programId }, roundType: 'LIVE_FINAL', status: { in: OPEN_FINALE_STATUS }, finalizedAt: null },
    orderBy: { sortOrder: 'desc' },
    select: { id: true, name: true, windowCloseAt: true },
  })
}

/**
 * Per-project grand-final document status. Returns null unless the project is
 * enrolled (ProjectRoundState) in the program's active LIVE_FINAL round.
 */
export async function getFinalDocumentStatusForProject(
  prisma: PrismaClient,
  projectId: string,
): Promise<FinalDocumentStatus | null> {
  const project = await prisma.project.findUnique({
    where: { id: projectId },
    select: { id: true, programId: true },
  })
  if (!project) return null

  const round = await getOpenFinaleRound(prisma, project.programId)
  if (!round) return null

  const enrolled = await prisma.projectRoundState.findFirst({
    where: { projectId, roundId: round.id },
    select: { id: true },
  })
  if (!enrolled) return null

  const requirements = await prisma.fileRequirement.findMany({
    where: { roundId: round.id },
    orderBy: { sortOrder: 'asc' },
    select: { id: true, name: true, acceptedMimeTypes: true, isRequired: true },
  })

  const files = await prisma.projectFile.findMany({
    where: { projectId, roundId: round.id, requirementId: { in: requirements.map((r) => r.id) } },
    orderBy: { createdAt: 'desc' },
    select: { id: true, requirementId: true, fileName: true, mimeType: true, bucket: true, objectKey: true, createdAt: true },
  })
  const fileByReq = new Map<string, (typeof files)[number]>()
  for (const f of files) if (f.requirementId && !fileByReq.has(f.requirementId)) fileByReq.set(f.requirementId, f)

  const reqStatuses: FinalDocRequirement[] = requirements.map((r) => {
    const f = fileByReq.get(r.id) ?? null
    return {
      id: r.id, name: r.name, acceptedMimeTypes: r.acceptedMimeTypes, isRequired: r.isRequired,
      uploaded: !!f,
      file: f ? { id: f.id, fileName: f.fileName, mimeType: f.mimeType, bucket: f.bucket, objectKey: f.objectKey, createdAt: f.createdAt } : null,
    }
  })

  const required = reqStatuses.filter((r) => r.isRequired)
  const allRequiredUploaded = required.length > 0 && required.every((r) => r.uploaded)
  const deadline = round.windowCloseAt ?? null
  return {
    roundId: round.id,
    roundName: round.name,
    deadline,
    deadlinePassed: deadline ? new Date() > deadline : false,
    requirements: reqStatuses,
    allRequiredUploaded,
  }
}

/** Build the reminder notification payload for one finalist team lead. */
async function remindTeam(
  prisma: PrismaClient,
  args: { projectId: string; projectTitle: string; deadline: Date | null; missing: string[]; leadUserId: string },
) {
  await createNotification({
    userId: args.leadUserId,
    type: NotificationTypes.GRAND_FINAL_DOCS_REMINDER,
    title: 'Upload your Grand Final documents',
    message: args.missing.length
      ? `Still needed for "${args.projectTitle}": ${args.missing.join(', ')}.`
      : `Please upload the final documents for "${args.projectTitle}".`,
    linkUrl: `/applicant/documents`, // relative → client-side nav in-app; email renderer absolutizes
    metadata: {
      projectId: args.projectId,
      projectTitle: args.projectTitle,
      deadline: args.deadline?.toISOString(),
      missing: args.missing,
    },
  })
}

/**
 * Manual admin reminder blast. Targets `projectIds` if given, else all finalist
 * teams (enrolled in the active LIVE_FINAL round) with missing required docs.
 */
export async function sendManualFinalDocReminders(
  prisma: PrismaClient,
  opts: { programId: string; projectIds?: string[]; actorId: string },
): Promise<{ sent: number }> {
  const round = await getOpenFinaleRound(prisma, opts.programId)
  if (!round) return { sent: 0 }

  const states = await prisma.projectRoundState.findMany({
    where: { roundId: round.id, ...(opts.projectIds ? { projectId: { in: opts.projectIds } } : {}) },
    select: { projectId: true },
  })

  let sent = 0
  for (const { projectId } of states) {
    const status = await getFinalDocumentStatusForProject(prisma, projectId)
    if (!status) continue
    const missing = status.requirements.filter((r) => r.isRequired && !r.uploaded).map((r) => r.name)
    // When projectIds explicitly provided, send regardless; else only if missing docs.
    if (!opts.projectIds && missing.length === 0) continue

    const project = await prisma.project.findUnique({
      where: { id: projectId },
      select: { title: true, teamMembers: { where: { role: 'LEAD' }, take: 1, select: { userId: true } } },
    })
    const leadUserId = project?.teamMembers[0]?.userId
    if (!project || !leadUserId) continue

    await remindTeam(prisma, {
      projectId, projectTitle: project.title, deadline: status.deadline, missing, leadUserId,
    })
    sent++
  }
  return { sent }
}

/**
 * Cron: remind finalist teams (enrolled in an active LIVE_FINAL round) with
 * missing required documents, once, when the deadline is within the configured
 * window. Stamps FinalistConfirmation.finalDocsReminderSentAt.
 */
export async function sendDueFinalDocReminders(prisma: PrismaClient): Promise<{ remindersSent: number }> {
  const now = new Date()
  const rounds = await prisma.round.findMany({
    where: { roundType: 'LIVE_FINAL', status: { in: OPEN_FINALE_STATUS }, finalizedAt: null },
    select: { id: true, windowCloseAt: true, configJson: true, competition: { select: { programId: true } } },
  })

  let remindersSent = 0
  for (const round of rounds) {
    if (!round.windowCloseAt) continue
    const cfg = (round.configJson ?? {}) as { finalDocsReminderHoursBeforeDeadline?: number }
    const windowMs = (cfg.finalDocsReminderHoursBeforeDeadline ?? 48) * 3_600_000
    const isDue = round.windowCloseAt.getTime() <= now.getTime() + windowMs && round.windowCloseAt.getTime() > now.getTime()
    if (!isDue) continue

    const states = await prisma.projectRoundState.findMany({ where: { roundId: round.id }, select: { projectId: true } })
    for (const { projectId } of states) {
      const confirmation = await prisma.finalistConfirmation.findFirst({
        where: { projectId, finalDocsReminderSentAt: null },
        select: { id: true },
      })
      if (!confirmation) continue
      const status = await getFinalDocumentStatusForProject(prisma, projectId)
      if (!status) continue
      const missing = status.requirements.filter((r) => r.isRequired && !r.uploaded).map((r) => r.name)
      if (missing.length === 0) continue

      const project = await prisma.project.findUnique({
        where: { id: projectId },
        select: { title: true, teamMembers: { where: { role: 'LEAD' }, take: 1, select: { userId: true } } },
      })
      const leadUserId = project?.teamMembers[0]?.userId
      if (!project || !leadUserId) continue

      try {
        await remindTeam(prisma, { projectId, projectTitle: project.title, deadline: status.deadline, missing, leadUserId })
        await prisma.finalistConfirmation.update({ where: { id: confirmation.id }, data: { finalDocsReminderSentAt: new Date() } })
        remindersSent++
      } catch (e) {
        console.error('[final-docs] reminder failed for', projectId, e)
      }
    }
  }
  return { remindersSent }
}

export type ReviewDocument = { requirementId: string; requirementName: string; file: { id: string; fileName: string; mimeType: string; url: string } | null }
export type ReviewTeam = { projectId: string; teamName: string; category: string | null; documents: ReviewDocument[]; submitted: boolean }
export type ReviewPayload = { round: { id: string; name: string; deadline: Date | null }; totalCount: number; submittedCount: number; teams: ReviewTeam[] }

/**
 * Read-only review payload of every finalist team enrolled in the program's
 * active LIVE_FINAL round, with their uploaded grand-final documents. Each
 * present file carries a server-generated GET presigned URL (1h) so finale
 * judges — who are not assignment-gated through file.getDownloadUrl — can open
 * the documents directly in the browser.
 */
export async function listFinalistDocumentsForReview(prisma: PrismaClient, programId: string): Promise<ReviewPayload> {
  const round = await getOpenFinaleRound(prisma, programId)
  if (!round) return { round: { id: '', name: '', deadline: null }, totalCount: 0, submittedCount: 0, teams: [] }

  const requirements = await prisma.fileRequirement.findMany({ where: { roundId: round.id }, orderBy: { sortOrder: 'asc' }, select: { id: true, name: true } })
  const states = await prisma.projectRoundState.findMany({
    where: { roundId: round.id },
    select: { project: { select: { id: true, title: true, teamName: true, competitionCategory: true } } },
  })

  const teams: ReviewTeam[] = []
  for (const { project } of states) {
    const files = await prisma.projectFile.findMany({
      where: { projectId: project.id, roundId: round.id, requirementId: { in: requirements.map((r) => r.id) } },
      orderBy: { createdAt: 'desc' },
      select: { id: true, requirementId: true, fileName: true, mimeType: true, bucket: true, objectKey: true },
    })
    const byReq = new Map<string, (typeof files)[number]>()
    for (const f of files) if (f.requirementId && !byReq.has(f.requirementId)) byReq.set(f.requirementId, f)

    const documents: ReviewDocument[] = []
    for (const r of requirements) {
      const f = byReq.get(r.id)
      documents.push({
        requirementId: r.id,
        requirementName: r.name,
        file: f ? { id: f.id, fileName: f.fileName, mimeType: f.mimeType, url: await getPresignedUrl(f.bucket, f.objectKey, 'GET', 3600) } : null,
      })
    }
    teams.push({
      projectId: project.id,
      teamName: project.teamName || project.title,
      category: project.competitionCategory,
      documents,
      submitted: documents.every((d) => d.file !== null),
    })
  }

  teams.sort((a, b) => (a.category || '').localeCompare(b.category || '') || a.teamName.localeCompare(b.teamName))
  return {
    round: { id: round.id, name: round.name, deadline: round.windowCloseAt ?? null },
    totalCount: teams.length,
    submittedCount: teams.filter((t) => t.submitted).length,
    teams,
  }
}

/** True if user is admin or a member of the program's open LIVE_FINAL jury group (DRAFT or ACTIVE). */
export async function userCanReviewFinals(prisma: PrismaClient, userId: string, userRole: string, programId: string): Promise<boolean> {
  if (userRole === 'SUPER_ADMIN' || userRole === 'PROGRAM_ADMIN') return true
  const round = await prisma.round.findFirst({
    where: { competition: { programId }, roundType: 'LIVE_FINAL', status: { in: OPEN_FINALE_STATUS }, finalizedAt: null },
    orderBy: { sortOrder: 'desc' },
    select: { juryGroupId: true },
  })
  if (!round?.juryGroupId) return false
  const member = await prisma.juryGroupMember.findFirst({ where: { juryGroupId: round.juryGroupId, userId }, select: { id: true } })
  return !!member
}