import { z } from 'zod'
import { TRPCError } from '@trpc/server'
import { router, protectedProcedure, adminProcedure, juryProcedure } from '../trpc'
import { logAudit } from '@/server/utils/audit'
import { notifyAdmins, NotificationTypes } from '../services/in-app-notification'
import { processEvaluationReminders } from '../services/evaluation-reminders'
import { generateSummary } from '@/server/services/ai-evaluation-summary'

export const evaluationRouter = router({
  /**
   * Get evaluation for an assignment
   */
  get: protectedProcedure
    .input(z.object({ assignmentId: z.string() }))
    .query(async ({ ctx, input }) => {
      // Verify ownership or admin
      const assignment = await ctx.prisma.assignment.findUniqueOrThrow({
        where: { id: input.assignmentId },
      })

      if (
        ctx.user.role === 'JURY_MEMBER' &&
        assignment.userId !== ctx.user.id
      ) {
        throw new TRPCError({ code: 'FORBIDDEN' })
      }

      return ctx.prisma.evaluation.findUnique({
        where: { assignmentId: input.assignmentId },
        include: {
          form: true,
        },
      })
    }),

  /**
   * Start an evaluation (creates draft)
   */
  start: protectedProcedure
    .input(
      z.object({
        assignmentId: z.string(),
      })
    )
    .mutation(async ({ ctx, input }) => {
      // Verify assignment ownership
      const assignment = await ctx.prisma.assignment.findUniqueOrThrow({
        where: { id: input.assignmentId },
      })

      if (assignment.userId !== ctx.user.id) {
        throw new TRPCError({ code: 'FORBIDDEN' })
      }

      // Get active form for this stage
      const form = await ctx.prisma.evaluationForm.findFirst({
        where: { roundId: assignment.roundId, isActive: true },
      })
      if (!form) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'No active evaluation form for this stage',
        })
      }

      // Check if evaluation exists
      const existing = await ctx.prisma.evaluation.findUnique({
        where: { assignmentId: input.assignmentId },
      })

      if (existing) return existing

      return ctx.prisma.evaluation.create({
        data: {
          assignmentId: input.assignmentId,
          formId: form.id,
          status: 'DRAFT',
        },
      })
    }),

  /**
   * Autosave evaluation (debounced on client)
   */
  autosave: protectedProcedure
    .input(
      z.object({
        id: z.string(),
        criterionScoresJson: z.record(z.union([z.number(), z.string(), z.boolean()])).optional(),
        globalScore: z.number().int().min(1).max(10).optional().nullable(),
        binaryDecision: z.boolean().optional().nullable(),
        feedbackText: z.string().optional().nullable(),
      })
    )
    .mutation(async ({ ctx, input }) => {
      const { id, ...data } = input

      // Verify ownership and status
      const evaluation = await ctx.prisma.evaluation.findUniqueOrThrow({
        where: { id },
        include: { assignment: true },
      })

      if (evaluation.assignment.userId !== ctx.user.id) {
        throw new TRPCError({ code: 'FORBIDDEN' })
      }

      if (
        evaluation.status === 'SUBMITTED' ||
        evaluation.status === 'LOCKED'
      ) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'Cannot edit submitted evaluation',
        })
      }

      return ctx.prisma.evaluation.update({
        where: { id },
        data: {
          ...data,
          status: 'DRAFT',
        },
      })
    }),

  /**
   * Submit evaluation (final)
   */
  submit: protectedProcedure
    .input(
      z.object({
        id: z.string(),
        criterionScoresJson: z.record(z.union([z.number(), z.string(), z.boolean()])),
        globalScore: z.number().int().min(1).max(10),
        binaryDecision: z.boolean(),
        feedbackText: z.string().min(10),
      })
    )
    .mutation(async ({ ctx, input }) => {
      const { id, ...data } = input

      // Verify ownership
      const evaluation = await ctx.prisma.evaluation.findUniqueOrThrow({
        where: { id },
        include: {
          assignment: true,
        },
      })

      if (evaluation.assignment.userId !== ctx.user.id) {
        throw new TRPCError({ code: 'FORBIDDEN' })
      }

      // Check voting window via round
      const round = await ctx.prisma.round.findUniqueOrThrow({
        where: { id: evaluation.assignment.roundId },
      })
      const now = new Date()

      if (round.status !== 'ROUND_ACTIVE') {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'Round is not active',
        })
      }

      // Check for grace period
      const gracePeriod = await ctx.prisma.gracePeriod.findFirst({
        where: {
          roundId: round.id,
          userId: ctx.user.id,
          OR: [
            { projectId: null },
            { projectId: evaluation.assignment.projectId },
          ],
          extendedUntil: { gte: now },
        },
      })

      const effectiveEndDate = gracePeriod?.extendedUntil ?? round.windowCloseAt

      if (round.windowOpenAt && now < round.windowOpenAt) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'Voting has not started yet',
        })
      }

      if (effectiveEndDate && now > effectiveEndDate) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'Voting window has closed',
        })
      }

      // Submit evaluation and mark assignment as completed atomically
      const [updated] = await ctx.prisma.$transaction([
        ctx.prisma.evaluation.update({
          where: { id },
          data: {
            ...data,
            status: 'SUBMITTED',
            submittedAt: now,
          },
        }),
        ctx.prisma.assignment.update({
          where: { id: evaluation.assignmentId },
          data: { isCompleted: true },
        }),
      ])

      // Audit log
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'EVALUATION_SUBMITTED',
        entityType: 'Evaluation',
        entityId: id,
        detailsJson: {
          projectId: evaluation.assignment.projectId,
          roundId: evaluation.assignment.roundId,
          globalScore: data.globalScore,
          binaryDecision: data.binaryDecision,
        },
        ipAddress: ctx.ip,
        userAgent: ctx.userAgent,
      })

      return updated
    }),

  /**
   * Get aggregated stats for a project (admin only)
   */
  getProjectStats: adminProcedure
    .input(z.object({ projectId: z.string() }))
    .query(async ({ ctx, input }) => {
      const evaluations = await ctx.prisma.evaluation.findMany({
        where: {
          status: 'SUBMITTED',
          assignment: { projectId: input.projectId },
        },
      })

      if (evaluations.length === 0) {
        return null
      }

      const globalScores = evaluations
        .map((e) => e.globalScore)
        .filter((s): s is number => s !== null)

      const yesVotes = evaluations.filter(
        (e) => e.binaryDecision === true
      ).length

      return {
        totalEvaluations: evaluations.length,
        averageGlobalScore:
          globalScores.length > 0
            ? globalScores.reduce((a, b) => a + b, 0) / globalScores.length
            : null,
        minScore: globalScores.length > 0 ? Math.min(...globalScores) : null,
        maxScore: globalScores.length > 0 ? Math.max(...globalScores) : null,
        yesVotes,
        noVotes: evaluations.length - yesVotes,
        yesPercentage: (yesVotes / evaluations.length) * 100,
      }
    }),

  /**
   * Get all evaluations for a stage (admin only)
   */
  listByStage: adminProcedure
    .input(
      z.object({
        roundId: z.string(),
        status: z.enum(['NOT_STARTED', 'DRAFT', 'SUBMITTED', 'LOCKED']).optional(),
      })
    )
    .query(async ({ ctx, input }) => {
      return ctx.prisma.evaluation.findMany({
        where: {
          assignment: { roundId: input.roundId },
          ...(input.status && { status: input.status }),
        },
        include: {
          assignment: {
            include: {
              user: { select: { id: true, name: true, email: true } },
              project: { select: { id: true, title: true } },
            },
          },
        },
        orderBy: { updatedAt: 'desc' },
      })
    }),

  /**
   * Get my past evaluations (read-only for jury)
   */
  myPastEvaluations: protectedProcedure
    .input(z.object({ roundId: z.string().optional() }))
    .query(async ({ ctx, input }) => {
      return ctx.prisma.evaluation.findMany({
        where: {
          assignment: {
            userId: ctx.user.id,
            ...(input.roundId && { roundId: input.roundId }),
          },
          status: 'SUBMITTED',
        },
        include: {
          assignment: {
            include: {
              project: { select: { id: true, title: true } },
              round: { select: { id: true, name: true } },
            },
          },
        },
        orderBy: { submittedAt: 'desc' },
      })
    }),

  // =========================================================================
  // Conflict of Interest (COI) Endpoints
  // =========================================================================

  /**
   * Declare a conflict of interest for an assignment
   */
  declareCOI: protectedProcedure
    .input(
      z.object({
        assignmentId: z.string(),
        hasConflict: z.boolean(),
        conflictType: z.string().optional(),
        description: z.string().optional(),
      })
    )
    .mutation(async ({ ctx, input }) => {
      // Look up the assignment to get projectId, roundId, userId
      const assignment = await ctx.prisma.assignment.findUniqueOrThrow({
        where: { id: input.assignmentId },
        include: {
          project: { select: { title: true } },
          round: { select: { id: true, name: true } },
        },
      })

      // Verify ownership
      if (assignment.userId !== ctx.user.id) {
        throw new TRPCError({ code: 'FORBIDDEN' })
      }

      // Upsert COI record
      const coi = await ctx.prisma.conflictOfInterest.upsert({
        where: { assignmentId: input.assignmentId },
        create: {
          assignmentId: input.assignmentId,
          userId: ctx.user.id,
          projectId: assignment.projectId,
          hasConflict: input.hasConflict,
          conflictType: input.hasConflict ? input.conflictType : null,
          description: input.hasConflict ? input.description : null,
        },
        update: {
          hasConflict: input.hasConflict,
          conflictType: input.hasConflict ? input.conflictType : null,
          description: input.hasConflict ? input.description : null,
          declaredAt: new Date(),
        },
      })

      // Notify admins if conflict declared
      if (input.hasConflict) {
        await notifyAdmins({
          type: NotificationTypes.JURY_INACTIVE,
          title: 'Conflict of Interest Declared',
          message: `${ctx.user.name || ctx.user.email} declared a conflict of interest (${input.conflictType || 'unspecified'}) for project "${assignment.project.title}" in ${assignment.round.name}.`,
          linkUrl: `/admin/stages/${assignment.roundId}/coi`,
          linkLabel: 'Review COI',
          priority: 'high',
          metadata: {
            assignmentId: input.assignmentId,
            userId: ctx.user.id,
            projectId: assignment.projectId,
            roundId: assignment.roundId,
            conflictType: input.conflictType,
          },
        })
      }

      // Audit log
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'COI_DECLARED',
        entityType: 'ConflictOfInterest',
        entityId: coi.id,
        detailsJson: {
          assignmentId: input.assignmentId,
          projectId: assignment.projectId,
          roundId: assignment.roundId,
          hasConflict: input.hasConflict,
          conflictType: input.conflictType,
        },
        ipAddress: ctx.ip,
        userAgent: ctx.userAgent,
      })

      return coi
    }),

  /**
   * Get COI status for an assignment
   */
  getCOIStatus: protectedProcedure
    .input(z.object({ assignmentId: z.string() }))
    .query(async ({ ctx, input }) => {
      return ctx.prisma.conflictOfInterest.findUnique({
        where: { assignmentId: input.assignmentId },
      })
    }),

  /**
   * List COI declarations for a stage (admin only)
   */
  listCOIByStage: adminProcedure
    .input(
      z.object({
        roundId: z.string(),
        hasConflictOnly: z.boolean().optional(),
      })
    )
    .query(async ({ ctx, input }) => {
      return ctx.prisma.conflictOfInterest.findMany({
        where: {
          assignment: { roundId: input.roundId },
          ...(input.hasConflictOnly && { hasConflict: true }),
        },
        include: {
          user: { select: { id: true, name: true, email: true } },
          assignment: {
            include: {
              project: { select: { id: true, title: true } },
            },
          },
          reviewedBy: { select: { id: true, name: true, email: true } },
        },
        orderBy: { declaredAt: 'desc' },
      })
    }),

  /**
   * Review a COI declaration (admin only)
   */
  reviewCOI: adminProcedure
    .input(
      z.object({
        id: z.string(),
        reviewAction: z.enum(['cleared', 'reassigned', 'noted']),
      })
    )
    .mutation(async ({ ctx, input }) => {
      const coi = await ctx.prisma.conflictOfInterest.update({
        where: { id: input.id },
        data: {
          reviewedById: ctx.user.id,
          reviewedAt: new Date(),
          reviewAction: input.reviewAction,
        },
      })

      // Audit log
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'COI_REVIEWED',
        entityType: 'ConflictOfInterest',
        entityId: input.id,
        detailsJson: {
          reviewAction: input.reviewAction,
          assignmentId: coi.assignmentId,
          userId: coi.userId,
          projectId: coi.projectId,
        },
        ipAddress: ctx.ip,
        userAgent: ctx.userAgent,
      })

      return coi
    }),

  // =========================================================================
  // Reminder Triggers
  // =========================================================================

  /**
   * Manually trigger reminder check for a specific stage (admin only)
   */
  triggerReminders: adminProcedure
    .input(z.object({ roundId: z.string() }))
    .mutation(async ({ ctx, input }) => {
      const result = await processEvaluationReminders(input.roundId)

      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'REMINDERS_TRIGGERED',
        entityType: 'Stage',
        entityId: input.roundId,
        detailsJson: {
          sent: result.sent,
          errors: result.errors,
        },
        ipAddress: ctx.ip,
        userAgent: ctx.userAgent,
      })

      return result
    }),

  // =========================================================================
  // AI Evaluation Summary Endpoints
  // =========================================================================

  /**
   * Generate an AI-powered evaluation summary for a project (admin only)
   */
  generateSummary: adminProcedure
    .input(
      z.object({
        projectId: z.string(),
        roundId: z.string(),
      })
    )
    .mutation(async ({ ctx, input }) => {
      return generateSummary({
        projectId: input.projectId,
        roundId: input.roundId,
        userId: ctx.user.id,
        prisma: ctx.prisma,
      })
    }),

  /**
   * Get an existing evaluation summary for a project (admin only)
   */
  getSummary: adminProcedure
    .input(
      z.object({
        projectId: z.string(),
        roundId: z.string(),
      })
    )
    .query(async ({ ctx, input }) => {
      return ctx.prisma.evaluationSummary.findUnique({
        where: {
          projectId_roundId: {
            projectId: input.projectId,
            roundId: input.roundId,
          },
        },
      })
    }),

  /**
   * Generate summaries for all projects in a stage with submitted evaluations (admin only)
   */
  generateBulkSummaries: adminProcedure
    .input(z.object({ roundId: z.string() }))
    .mutation(async ({ ctx, input }) => {
      // Find all projects with at least 1 submitted evaluation in this stage
      const assignments = await ctx.prisma.assignment.findMany({
        where: {
          roundId: input.roundId,
          evaluation: {
            status: 'SUBMITTED',
          },
        },
        select: { projectId: true },
        distinct: ['projectId'],
      })

      const projectIds = assignments.map((a) => a.projectId)

      let generated = 0
      const errors: Array<{ projectId: string; error: string }> = []

      // Generate summaries sequentially to avoid rate limits
      for (const projectId of projectIds) {
        try {
          await generateSummary({
            projectId,
            roundId: input.roundId,
            userId: ctx.user.id,
            prisma: ctx.prisma,
          })
          generated++
        } catch (error) {
          errors.push({
            projectId,
            error: error instanceof Error ? error.message : 'Unknown error',
          })
        }
      }

      return {
        total: projectIds.length,
        generated,
        errors,
      }
    }),

  // =========================================================================
  // Side-by-Side Comparison (F4)
  // =========================================================================

  /**
   * Get multiple projects with evaluations for side-by-side comparison
   */
  getMultipleForComparison: juryProcedure
    .input(
      z.object({
        projectIds: z.array(z.string()).min(2).max(3),
        roundId: z.string(),
      })
    )
    .query(async ({ ctx, input }) => {
      // Verify all projects are assigned to current user in this stage
      const assignments = await ctx.prisma.assignment.findMany({
        where: {
          userId: ctx.user.id,
          roundId: input.roundId,
          projectId: { in: input.projectIds },
        },
        include: {
          project: {
            select: {
              id: true,
              title: true,
              teamName: true,
              description: true,
              country: true,
              tags: true,
              files: {
                select: {
                  id: true,
                  fileName: true,
                  fileType: true,
                  size: true,
                },
              },
            },
          },
          evaluation: true,
        },
      })

      if (assignments.length !== input.projectIds.length) {
        throw new TRPCError({
          code: 'FORBIDDEN',
          message: 'You are not assigned to all requested projects in this stage',
        })
      }

      // Fetch the active evaluation form for this stage to get criteria labels
      const evaluationForm = await ctx.prisma.evaluationForm.findFirst({
        where: { roundId: input.roundId, isActive: true },
        select: { criteriaJson: true, scalesJson: true },
      })

      return {
        items: assignments.map((a) => ({
          project: a.project,
          evaluation: a.evaluation,
          assignmentId: a.id,
        })),
        criteria: evaluationForm?.criteriaJson as Array<{
          id: string; label: string; description?: string; scale?: string; weight?: number; type?: string
        }> | null,
        scales: evaluationForm?.scalesJson as Record<string, { min: number; max: number }> | null,
      }
    }),

  // =========================================================================
  // Peer Review & Discussion (F13)
  // =========================================================================

  /**
   * Get anonymized peer evaluation summary for a project
   */
  getPeerSummary: juryProcedure
    .input(
      z.object({
        projectId: z.string(),
        roundId: z.string(),
      })
    )
    .query(async ({ ctx, input }) => {
      // Verify user has submitted their own evaluation first
      const userAssignment = await ctx.prisma.assignment.findFirst({
        where: {
          userId: ctx.user.id,
          projectId: input.projectId,
          roundId: input.roundId,
        },
        include: { evaluation: true },
      })

      if (!userAssignment || userAssignment.evaluation?.status !== 'SUBMITTED') {
        throw new TRPCError({
          code: 'PRECONDITION_FAILED',
          message: 'You must submit your own evaluation before viewing peer summaries',
        })
      }

      // Check stage settings for peer review
      const stage = await ctx.prisma.round.findUniqueOrThrow({
        where: { id: input.roundId },
      })

      const settings = (stage.configJson as Record<string, unknown>) || {}
      if (!settings.peer_review_enabled) {
        throw new TRPCError({
          code: 'FORBIDDEN',
          message: 'Peer review is not enabled for this stage',
        })
      }

      // Get all submitted evaluations for this project
      const evaluations = await ctx.prisma.evaluation.findMany({
        where: {
          status: 'SUBMITTED',
          assignment: {
            projectId: input.projectId,
            roundId: input.roundId,
          },
        },
        include: {
          assignment: {
            include: {
              user: { select: { id: true, name: true } },
            },
          },
        },
      })

      if (evaluations.length === 0) {
        return { aggregated: null, individualScores: [], totalEvaluations: 0 }
      }

      // Calculate average and stddev per criterion
      const criterionData: Record<string, number[]> = {}
      evaluations.forEach((e) => {
        const scores = e.criterionScoresJson as Record<string, number> | null
        if (scores) {
          Object.entries(scores).forEach(([key, val]) => {
            if (typeof val === 'number') {
              if (!criterionData[key]) criterionData[key] = []
              criterionData[key].push(val)
            }
          })
        }
      })

      const aggregated: Record<string, { average: number; stddev: number; count: number; distribution: Record<number, number> }> = {}
      Object.entries(criterionData).forEach(([key, scores]) => {
        const avg = scores.reduce((a, b) => a + b, 0) / scores.length
        const variance = scores.reduce((sum, s) => sum + Math.pow(s - avg, 2), 0) / scores.length
        const stddev = Math.sqrt(variance)

        const distribution: Record<number, number> = {}
        scores.forEach((s) => {
          const bucket = Math.round(s)
          distribution[bucket] = (distribution[bucket] || 0) + 1
        })

        aggregated[key] = { average: avg, stddev, count: scores.length, distribution }
      })

      // Anonymize individual scores based on round settings
      const anonymizationLevel = (settings.anonymization_level as string) || 'fully_anonymous'

      const individualScores = evaluations.map((e) => {
        let jurorLabel: string
        if (anonymizationLevel === 'named') {
          jurorLabel = e.assignment.user.name || 'Juror'
        } else if (anonymizationLevel === 'show_initials') {
          const name = e.assignment.user.name || ''
          jurorLabel = name
            .split(' ')
            .map((n) => n[0])
            .join('')
            .toUpperCase() || 'J'
        } else {
          jurorLabel = `Juror ${evaluations.indexOf(e) + 1}`
        }

        return {
          jurorLabel,
          globalScore: e.globalScore,
          binaryDecision: e.binaryDecision,
          criterionScoresJson: e.criterionScoresJson,
        }
      })

      return {
        aggregated,
        individualScores,
        totalEvaluations: evaluations.length,
      }
    }),

  /**
   * Get or create a discussion for a project evaluation
   */
  getDiscussion: juryProcedure
    .input(
      z.object({
        projectId: z.string(),
        roundId: z.string(),
      })
    )
    .query(async ({ ctx, input }) => {
      // Get or create discussion
      let discussion = await ctx.prisma.evaluationDiscussion.findUnique({
        where: {
          projectId_roundId: {
            projectId: input.projectId,
            roundId: input.roundId,
          },
        },
        include: {
          comments: {
            include: {
              user: { select: { id: true, name: true } },
            },
            orderBy: { createdAt: 'asc' },
          },
        },
      })

      if (!discussion) {
        discussion = await ctx.prisma.evaluationDiscussion.create({
          data: {
            projectId: input.projectId,
            roundId: input.roundId,
          },
          include: {
            comments: {
              include: {
                user: { select: { id: true, name: true } },
              },
              orderBy: { createdAt: 'asc' },
            },
          },
        })
      }

      // Anonymize comments based on round settings
      const round = await ctx.prisma.round.findUniqueOrThrow({
        where: { id: input.roundId },
      })
      const settings = (round.configJson as Record<string, unknown>) || {}
      const anonymizationLevel = (settings.anonymization_level as string) || 'fully_anonymous'

      const anonymizedComments = discussion.comments.map((c: { id: string; userId: string; user: { name: string | null }; content: string; createdAt: Date }, idx: number) => {
        let authorLabel: string
        if (anonymizationLevel === 'named' || c.userId === ctx.user.id) {
          authorLabel = c.user.name || 'Juror'
        } else if (anonymizationLevel === 'show_initials') {
          const name = c.user.name || ''
          authorLabel = name
            .split(' ')
            .map((n: string) => n[0])
            .join('')
            .toUpperCase() || 'J'
        } else {
          authorLabel = `Juror ${idx + 1}`
        }

        return {
          id: c.id,
          authorLabel,
          isOwn: c.userId === ctx.user.id,
          content: c.content,
          createdAt: c.createdAt,
        }
      })

      return {
        id: discussion.id,
        status: discussion.status,
        createdAt: discussion.createdAt,
        closedAt: discussion.closedAt,
        comments: anonymizedComments,
      }
    }),

  /**
   * Add a comment to a project evaluation discussion
   */
  addComment: juryProcedure
    .input(
      z.object({
        projectId: z.string(),
        roundId: z.string(),
        content: z.string().min(1).max(2000),
      })
    )
    .mutation(async ({ ctx, input }) => {
      // Check max comment length from round settings
      const round = await ctx.prisma.round.findUniqueOrThrow({
        where: { id: input.roundId },
      })
      const settings = (round.configJson as Record<string, unknown>) || {}
      const maxLength = (settings.max_comment_length as number) || 2000
      if (input.content.length > maxLength) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: `Comment exceeds maximum length of ${maxLength} characters`,
        })
      }

      // Get or create discussion
      let discussion = await ctx.prisma.evaluationDiscussion.findUnique({
        where: {
          projectId_roundId: {
            projectId: input.projectId,
            roundId: input.roundId,
          },
        },
      })

      if (!discussion) {
        discussion = await ctx.prisma.evaluationDiscussion.create({
          data: {
            projectId: input.projectId,
            roundId: input.roundId,
          },
        })
      }

      if (discussion.status === 'closed') {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'This discussion has been closed',
        })
      }

      const comment = await ctx.prisma.discussionComment.create({
        data: {
          discussionId: discussion.id,
          userId: ctx.user.id,
          content: input.content,
        },
      })

      // Audit log
      try {
        await logAudit({
          prisma: ctx.prisma,
          userId: ctx.user.id,
          action: 'DISCUSSION_COMMENT_ADDED',
          entityType: 'DiscussionComment',
          entityId: comment.id,
          detailsJson: {
            discussionId: discussion.id,
            projectId: input.projectId,
            roundId: input.roundId,
          },
          ipAddress: ctx.ip,
          userAgent: ctx.userAgent,
        })
      } catch {
        // Never throw on audit failure
      }

      return comment
    }),

  /**
   * Close a discussion (admin only)
   */
  closeDiscussion: adminProcedure
    .input(z.object({ discussionId: z.string() }))
    .mutation(async ({ ctx, input }) => {
      const discussion = await ctx.prisma.evaluationDiscussion.update({
        where: { id: input.discussionId },
        data: {
          status: 'closed',
          closedAt: new Date(),
          closedById: ctx.user.id,
        },
      })

      // Audit log
      try {
        await logAudit({
          prisma: ctx.prisma,
          userId: ctx.user.id,
          action: 'DISCUSSION_CLOSED',
          entityType: 'EvaluationDiscussion',
          entityId: input.discussionId,
          detailsJson: {
            projectId: discussion.projectId,
            roundId: discussion.roundId,
          },
          ipAddress: ctx.ip,
          userAgent: ctx.userAgent,
        })
      } catch {
        // Never throw on audit failure
      }

      return discussion
    }),

  // =========================================================================
  // Evaluation Form CRUD (Admin)
  // =========================================================================

  /**
   * Get active evaluation form for a round (admin view with full details)
   */
  getForm: adminProcedure
    .input(z.object({ roundId: z.string() }))
    .query(async ({ ctx, input }) => {
      const form = await ctx.prisma.evaluationForm.findFirst({
        where: { roundId: input.roundId, isActive: true },
      })

      if (!form) return null

      return {
        id: form.id,
        roundId: form.roundId,
        version: form.version,
        isActive: form.isActive,
        criteriaJson: form.criteriaJson as Array<{
          id: string
          label: string
          description?: string
          weight?: number
          minScore?: number
          maxScore?: number
        }>,
        scalesJson: form.scalesJson as Record<string, unknown> | null,
        createdAt: form.createdAt,
        updatedAt: form.updatedAt,
      }
    }),

  /**
   * Create or update the evaluation form for a round.
   * Deactivates any existing active form and creates a new versioned one.
   */
  upsertForm: adminProcedure
    .input(
      z.object({
        roundId: z.string(),
        criteria: z.array(
          z.object({
            id: z.string(),
            label: z.string().min(1).max(255),
            description: z.string().max(2000).optional(),
            weight: z.number().min(0).max(100).optional(),
            minScore: z.number().int().min(0).optional(),
            maxScore: z.number().int().min(1).optional(),
          })
        ).min(1),
      })
    )
    .mutation(async ({ ctx, input }) => {
      const { roundId, criteria } = input

      // Verify round exists
      await ctx.prisma.round.findUniqueOrThrow({ where: { id: roundId } })

      // Get current max version for this round
      const latestForm = await ctx.prisma.evaluationForm.findFirst({
        where: { roundId },
        orderBy: { version: 'desc' },
        select: { version: true },
      })
      const nextVersion = (latestForm?.version ?? 0) + 1

      // Build criteriaJson with defaults
      const criteriaJson = criteria.map((c) => ({
        id: c.id,
        label: c.label,
        description: c.description || '',
        weight: c.weight ?? 1,
        scale: `${c.minScore ?? 1}-${c.maxScore ?? 10}`,
        required: true,
      }))

      // Auto-generate scalesJson from criteria min/max ranges
      const scaleSet = new Set(criteriaJson.map((c) => c.scale))
      const scalesJson: Record<string, { min: number; max: number }> = {}
      for (const scale of scaleSet) {
        const [min, max] = scale.split('-').map(Number)
        scalesJson[scale] = { min, max }
      }

      // Transaction: deactivate old → create new
      const form = await ctx.prisma.$transaction(async (tx) => {
        await tx.evaluationForm.updateMany({
          where: { roundId, isActive: true },
          data: { isActive: false },
        })

        return tx.evaluationForm.create({
          data: {
            roundId,
            version: nextVersion,
            criteriaJson,
            scalesJson,
            isActive: true,
          },
        })
      })

      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'UPSERT_EVALUATION_FORM',
        entityType: 'EvaluationForm',
        entityId: form.id,
        detailsJson: {
          roundId,
          version: nextVersion,
          criteriaCount: criteria.length,
        },
        ipAddress: ctx.ip,
        userAgent: ctx.userAgent,
      })

      return form
    }),

  // =========================================================================
  // Phase 4: Stage-scoped evaluation procedures
  // =========================================================================

  /**
   * Start a stage-scoped evaluation (create or return existing draft)
   */
  startStage: protectedProcedure
    .input(
      z.object({
        assignmentId: z.string(),
        roundId: z.string(),
      })
    )
    .mutation(async ({ ctx, input }) => {
      // Verify assignment ownership and roundId match
      const assignment = await ctx.prisma.assignment.findUniqueOrThrow({
        where: { id: input.assignmentId },
      })

      if (assignment.userId !== ctx.user.id) {
        throw new TRPCError({ code: 'FORBIDDEN' })
      }

      if (assignment.roundId !== input.roundId) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'Assignment does not belong to this stage',
        })
      }

      // Check round window
      const round = await ctx.prisma.round.findUniqueOrThrow({
        where: { id: input.roundId },
      })

      const now = new Date()
      if (round.status !== 'ROUND_ACTIVE') {
        throw new TRPCError({
          code: 'PRECONDITION_FAILED',
          message: 'Round is not active',
        })
      }

      // Check grace period
      const gracePeriod = await ctx.prisma.gracePeriod.findFirst({
        where: {
          roundId: input.roundId,
          userId: ctx.user.id,
          OR: [
            { projectId: null },
            { projectId: assignment.projectId },
          ],
          extendedUntil: { gte: now },
        },
      })

      const effectiveClose = gracePeriod?.extendedUntil ?? round.windowCloseAt
      if (round.windowOpenAt && now < round.windowOpenAt) {
        throw new TRPCError({
          code: 'PRECONDITION_FAILED',
          message: 'Evaluation window has not opened yet',
        })
      }
      if (effectiveClose && now > effectiveClose) {
        throw new TRPCError({
          code: 'PRECONDITION_FAILED',
          message: 'Evaluation window has closed',
        })
      }

      // Check for existing evaluation
      const existing = await ctx.prisma.evaluation.findUnique({
        where: { assignmentId: input.assignmentId },
      })
      if (existing) return existing

      // Get active evaluation form for this stage
      const form = await ctx.prisma.evaluationForm.findFirst({
        where: { roundId: input.roundId, isActive: true },
      })
      if (!form) {
        throw new TRPCError({
          code: 'BAD_REQUEST',
          message: 'No active evaluation form for this stage',
        })
      }

      return ctx.prisma.evaluation.create({
        data: {
          assignmentId: input.assignmentId,
          formId: form.id,
          status: 'DRAFT',
        },
      })
    }),

  /**
   * Get the active evaluation form for a stage
   */
  getStageForm: protectedProcedure
    .input(z.object({ roundId: z.string() }))
    .query(async ({ ctx, input }) => {
      const form = await ctx.prisma.evaluationForm.findFirst({
        where: { roundId: input.roundId, isActive: true },
      })

      if (!form) {
        return null
      }

      return {
        id: form.id,
        criteriaJson: form.criteriaJson as Array<{
          id: string
          label: string
          description?: string
          scale?: string
          weight?: number
          type?: string
          required?: boolean
        }>,
        scalesJson: form.scalesJson as Record<string, { min: number; max: number; labels?: Record<string, string> }> | null,
        version: form.version,
      }
    }),

  /**
   * Check the evaluation window status for a stage
   */
  checkStageWindow: protectedProcedure
    .input(
      z.object({
        roundId: z.string(),
        userId: z.string().optional(),
      })
    )
    .query(async ({ ctx, input }) => {
      const stage = await ctx.prisma.round.findUniqueOrThrow({
        where: { id: input.roundId },
        select: {
          id: true,
          status: true,
          windowOpenAt: true,
          windowCloseAt: true,
        },
      })

      const userId = input.userId ?? ctx.user.id
      const now = new Date()

      // Check for grace period
      const gracePeriod = await ctx.prisma.gracePeriod.findFirst({
        where: {
          roundId: input.roundId,
          userId,
          extendedUntil: { gte: now },
        },
        orderBy: { extendedUntil: 'desc' },
      })

      const effectiveClose = gracePeriod?.extendedUntil ?? stage.windowCloseAt

      const isOpen =
        stage.status === 'ROUND_ACTIVE' &&
        (!stage.windowOpenAt || now >= stage.windowOpenAt) &&
        (!effectiveClose || now <= effectiveClose)

      let reason = ''
      if (!isOpen) {
        if (stage.status !== 'ROUND_ACTIVE') {
          reason = 'Stage is not active'
        } else if (stage.windowOpenAt && now < stage.windowOpenAt) {
          reason = 'Window has not opened yet'
        } else {
          reason = 'Window has closed'
        }
      }

      return {
        isOpen,
        opensAt: stage.windowOpenAt,
        closesAt: stage.windowCloseAt,
        hasGracePeriod: !!gracePeriod,
        graceExpiresAt: gracePeriod?.extendedUntil ?? null,
        reason,
      }
    }),

  /**
   * List evaluations for the current user in a specific stage
   */
  listStageEvaluations: protectedProcedure
    .input(
      z.object({
        roundId: z.string(),
        projectId: z.string().optional(),
      })
    )
    .query(async ({ ctx, input }) => {
      const where: Record<string, unknown> = {
        assignment: {
          userId: ctx.user.id,
          roundId: input.roundId,
          ...(input.projectId ? { projectId: input.projectId } : {}),
        },
      }

      return ctx.prisma.evaluation.findMany({
        where,
        include: {
          assignment: {
            include: {
              project: { select: { id: true, title: true, teamName: true } },
            },
          },
          form: {
            select: { criteriaJson: true, scalesJson: true },
          },
        },
        orderBy: { updatedAt: 'desc' },
      })
    }),
})
