export const dynamic = 'force-dynamic'

import { NextRequest, NextResponse } from 'next/server'
import { getSession } from '@/lib/auth/get-session'
import { withUser, asAdmin } from '@/lib/db/with-user'
import { writeAuditLog } from '@/lib/db/audit'
import { auditLog } from '@/lib/db/schema'
import { eq, and, gte, sql } from 'drizzle-orm'
import { createDeepSeekClient } from '@/lib/claude/client'
import { getApiKey } from '@/lib/settings'

export async function POST(request: NextRequest) {
  const session = await getSession()
  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })

  // Rate limit
  const since = new Date(Date.now() - 60_000)
  const [rateRow] = await asAdmin(db =>
    db.select({ cnt: sql<number>`count(*)` }).from(auditLog)
      .where(and(
        eq(auditLog.changedBy, session.sub),
        eq(auditLog.action, 'ai_quality_check'),
        gte(auditLog.changedAt, since),
      ))
  )
  if (Number(rateRow?.cnt ?? 0) > 0)
    return NextResponse.json({ error: 'Rate limited — please wait 60 seconds' }, { status: 429 })

  const deepseekKey = await getApiKey('DEEPSEEK_API_KEY')
  const client = createDeepSeekClient(deepseekKey)

  let body: { description?: string; incident_type?: string }
  try {
    body = await request.json()
  } catch {
    return NextResponse.json({ error: 'Invalid JSON body' }, { status: 400 })
  }
  if (!body.description || !body.incident_type) {
    return NextResponse.json({ error: 'description and incident_type required' }, { status: 422 })
  }

  let res: Awaited<ReturnType<typeof client.chat.completions.create>>
  try {
    res = await client.chat.completions.create({
      model: 'deepseek-v4-pro',
      max_tokens: 1024,
      messages: [
        {
          role: 'system',
          content: `You are an HSE reporting assistant for a Malaysian 3PL warehouse. You must respond with valid JSON only — no markdown, no explanation outside the JSON object.

Output exactly this JSON structure:
{
  "score": <number 1-10>,
  "passes": <boolean, true when score >= 6>,
  "feedback": "<one-sentence quality summary>",
  "suggestions": ["<up to 3 concrete suggestions, empty array if score >= 6>"]
}

Scoring criteria: specificity (location, time, persons involved), completeness (what happened + immediate actions), clarity. Score 6 or above passes.`,
        },
        {
          role: 'user',
          content: `Assess this incident report description. Respond with JSON only.\n\nIncident type: ${body.incident_type}\nDescription: ${body.description}`,
        },
      ],
    })
  } catch {
    return NextResponse.json({ error: 'AI service unavailable' }, { status: 503 })
  }

  const raw = res.choices[0]?.message?.content
  if (!raw) return NextResponse.json({ error: 'AI returned empty response' }, { status: 500 })

  const json = raw.replace(/^```(?:json)?\s*/i, '').replace(/\s*```$/i, '').trim()

  let input: { score?: unknown; passes?: unknown; feedback?: unknown; suggestions?: unknown }
  try { input = JSON.parse(json) }
  catch { return NextResponse.json({ error: 'AI returned unexpected structure' }, { status: 500 }) }

  if (
    typeof input.score !== 'number' ||
    typeof input.passes !== 'boolean' ||
    typeof input.feedback !== 'string' ||
    !Array.isArray(input.suggestions)
  ) {
    return NextResponse.json({ error: 'AI returned unexpected structure' }, { status: 500 })
  }

  await withUser(session.sub, async tx => {
    await writeAuditLog(tx, 'incidents', session.sub, 'ai_quality_check', {
      score: input.score, passes: input.passes, model: 'deepseek-v4-pro',
    })
  })

  return NextResponse.json(input)
}