import { NextResponse } from 'next/server'
import { z } from 'zod'
import { withRouteContext } from '@/lib/api/with-route-context'
import { validateBody, validateQuery } from '@/lib/api/validate'

// GET /api/agent/memory
//
// Lists memory entries for the active company, ordered by pin > relevance >
// recency. Powers /settings/agent-memory (transparency UI per plan §11).
//
// Query params:
//   include_dismissed: 'true' includes is_active=false rows (audit view).
//   kind:              filter by kind.
//   limit:             1..200, default 200 (matches the storage cap).
//
// POST /api/agent/memory
//
// Inserts a memory entry for the company. Used by Phase B's free-text seed
// memory field ("Lägg till om ditt företag (valfritt)") to capture
// foundational facts as `kind=fact`, `source=user_taught` with an elevated
// relevance score so they land in the top-30 prompt block.
//
// Also usable from /settings/agent-memory ("Lägg till minne" affordance) and
// post-Phase 4 explicit "Kom ihåg det här" surfaces.

const KIND = ['fact', 'preference', 'pattern', 'correction'] as const
const SOURCE = ['composer', 'user_taught', 'agent_learned', 'derived'] as const

const MEMORY_COLUMNS =
  'id, kind, content, source, source_ref, relevance_score, is_pinned, is_active, last_accessed_at, created_at, updated_at'

const ListQuerySchema = z.object({
  include_dismissed: z.enum(['true', 'false']).optional(),
  kind: z.enum(KIND).optional(),
  limit: z.coerce.number().int().min(1).max(200).default(200),
})

const BodySchema = z.object({
  company_id: z.string().uuid().optional(),
  content: z.string().min(2).max(2000),
  kind: z.enum(KIND).default('fact'),
  source: z.enum(SOURCE).default('user_taught'),
  source_ref: z.string().max(200).optional(),
  // Default 1.0 keeps user-taught entries above composer-derived (0.5) by
  // default; conversation-time captures can land anywhere in [0, 1].
  relevance_score: z.number().min(0).max(1).default(1.0),
})

export const GET = withRouteContext('agent.memory.list', async (request, ctx) => {
  const { supabase, companyId, log } = ctx

  const validated = validateQuery(request, ListQuerySchema, {
    log,
    operation: 'agent.memory.list',
  })
  if (!validated.success) return validated.response
  const { include_dismissed, kind, limit } = validated.data

  let query = supabase
    .from('agent_memory')
    .select(MEMORY_COLUMNS)
    .eq('company_id', companyId)

  if (include_dismissed !== 'true') query = query.eq('is_active', true)
  if (kind) query = query.eq('kind', kind)

  query = query
    .order('is_active', { ascending: false })
    .order('is_pinned', { ascending: false })
    .order('relevance_score', { ascending: false })
    .order('last_accessed_at', { ascending: false, nullsFirst: false })
    .order('created_at', { ascending: false })
    .limit(limit)

  const { data, error } = await query
  if (error) throw error
  return NextResponse.json({ data: data ?? [] })
})

export const POST = withRouteContext(
  'agent.memory.create',
  async (request, ctx) => {
    const { supabase, companyId: activeCompanyId, user, log } = ctx

    const validation = await validateBody(request, BodySchema, {
      log,
      operation: 'agent.memory.create',
    })
    if (!validation.success) return validation.response
    const body = validation.data

    const companyId = body.company_id ?? activeCompanyId

    // requireWrite (wrapper option) checks the *active* company's role; if
    // the caller passes a different company_id in the body, re-check
    // membership + non-viewer role for THAT company specifically.
    const { data: bodyMembership } = await supabase
      .from('company_members')
      .select('role')
      .eq('company_id', companyId)
      .eq('user_id', user.id)
      .maybeSingle()
    if (!bodyMembership || bodyMembership.role === 'viewer') {
      return NextResponse.json(
        {
          error: {
            code: 'WRITE_PERMISSION_REQUIRED',
            message: 'Du har endast läsbehörighet i detta företag.',
            message_en: 'You only have read access in this company.',
          },
        },
        { status: 403 },
      )
    }

    const { data, error } = await supabase
      .from('agent_memory')
      .insert({
        company_id: companyId,
        kind: body.kind,
        content: body.content,
        source: body.source,
        source_ref: body.source_ref ?? null,
        relevance_score: body.relevance_score,
        is_active: true,
        created_by_user_id: user.id,
      })
      .select(MEMORY_COLUMNS)
      .single()
    if (error) throw error

    return NextResponse.json({ data })
  },
  { requireWrite: true },
)