import { createHandler } from './_shared/middleware'
import { resolveTypeId, resolveAgentId, resolvePromptConfigId, resolveLinkTypeId } from './_shared/resolve-ids'
import { runAgent } from './_shared/index'
import { create as adminCreate, update as adminUpdate, list as adminList } from './admin-data'

function adminDataUpdate(ctx: any, entity: string, id: string, fields: Record<string, any>) {
  return adminUpdate({ ...ctx, query: { ...((ctx as any).query || {}), entity, id } } as any, fields)
}

function adminDataList(ctx: any, entity: string, filters: Record<string, any>) {
  return adminList({ ...ctx, query: { ...((ctx as any).query || {}), entity, ...filters } } as any, {})
}

function extractJsonPlan(content: string): any {
  const match = content.match(/```json\s*([\s\S]*?)\s*```/)
  if (!match) return null
  try {
    return JSON.parse(match[1])
  } catch {
    return null
  }
}

async function buildCreatorMessage(item: any, threadMessages: any[]): Promise<string> {
  const d = item.data || {}
  const parentSummary = [
    `Title: ${item.title || '(no title)'}`,
    `Description: ${item.description || '(no description)'}`,
    d.work_type && `Work Type: ${d.work_type}`,
    item.status && `Status: ${item.status}`,
    d.priority && `Priority: ${d.priority}`,
    d.severity && `Severity: ${d.severity}`,
    d.team && `Team: ${d.team}`,
  ].filter(Boolean).join('\n')

  const analysis = threadMessages
    .filter((m: any) => m.data?.message_type === 'agent' || m.direction === 'outbound')
    .sort((a: any, b: any) => (b.sequence || 0) - (a.sequence || 0))[0]

  const parts = [
    `Create a documentation ticket for the following engineering work item.`,
    ``,
    parentSummary,
  ]

  if (analysis?.content) {
    parts.push(``, `Latest analysis:`, analysis.content)
  }

  return parts.join('\n')
}

export const handler = createHandler(async (ctx, body) => {
  const { item_id } = (body || {}) as { item_id?: string }
  if (!item_id) {
    const e: any = new Error('item_id is required')
    e.statusCode = 400
    throw e
  }

  const itemResult = await adminDataList(ctx, 'items', { id: item_id, limit: '1' })
  const item = Array.isArray(itemResult) ? itemResult[0] : (itemResult as any)?.data?.[0]
  if (!item) {
    const e: any = new Error('Work item not found')
    e.statusCode = 404
    throw e
  }

  const [engTicketThreadId, docsTicketTypeId, linkTypeId, agentId, promptConfigId] = await Promise.all([
    resolveTypeId('thread', 'eng_ticket_thread'),
    resolveTypeId('item', 'workbench_docs_ticket'),
    resolveLinkTypeId('workbench_documented_by'),
    resolveAgentId('Workbench Docs Ticket Creator'),
    resolvePromptConfigId('workbench_docs_ticket_creator'),
  ])

  const linkResult = await adminDataList(ctx, 'links', {
    source_id: item_id,
    source_type: 'items',
    link_type_id: linkTypeId,
    target_type: 'items',
    limit: '1',
  })
  const existingLink = Array.isArray(linkResult) ? linkResult[0] : (linkResult as any)?.data?.[0]

  if (existingLink?.target_id) {
    const targetResult = await adminDataList(ctx, 'items', { id: existingLink.target_id, limit: '1' })
    const target = Array.isArray(targetResult) ? targetResult[0] : (targetResult as any)?.data?.[0]
    return {
      docs_ticket_id: existingLink.target_id,
      title: target?.title || '',
      created: false,
      existing: true,
    }
  }

  const placeholder = await adminCreate(ctx, {
    entity: 'items',
    type_id: docsTicketTypeId,
    title: `Draft docs ticket for ${item.title || 'work item'}`,
    description: 'AI-generated documentation ticket draft - review required',
    status: 'draft',
    data: {
      work_item_id: item_id,
      status: 'draft',
    },
  } as any)

  const docsTicketId = (placeholder as any)?.id ?? (placeholder as any)?.data?.id
  if (!docsTicketId) {
    const e: any = new Error('Failed to create docs ticket')
    e.statusCode = 500
    throw e
  }

  const threadRecord = await adminCreate(ctx, {
    entity: 'threads',
    type_id: engTicketThreadId,
    target_type: 'items',
    target_id: docsTicketId,
    title: 'Docs ticket draft',
    visibility: 'internal',
    status: 'active',
    data: {
      agent_id: agentId,
      prompt_config_id: promptConfigId,
    },
  } as any)

  const threadId = (threadRecord as any)?.id ?? (threadRecord as any)?.data?.id
  if (!threadId) {
    const e: any = new Error('Failed to create docs ticket thread')
    e.statusCode = 500
    throw e
  }

  const parentThreadResult = await adminDataList(ctx, 'threads', {
    target_id: item_id,
    target_type: 'items',
    limit: '1',
  })
  const parentThreads = Array.isArray(parentThreadResult) ? parentThreadResult : (parentThreadResult as any)?.data
  const parentThreadId = parentThreads?.[0]?.id
  const messagesResult = await adminDataList(ctx, 'messages', {
    thread_id: parentThreadId,
    limit: '20',
    sort_field: 'sequence',
    sort_direction: 'desc',
  })
  const threadMessages = Array.isArray(messagesResult) ? messagesResult : (messagesResult as any)?.data

  const userMessage = await buildCreatorMessage(item, threadMessages || [])
  const agentMsg = await runAgent(threadId, userMessage, ctx)

  const plan = extractJsonPlan(agentMsg?.content || '')
  if (plan && agentMsg?.id) {
    const currentData = agentMsg.data || {}
    await adminDataUpdate(ctx, 'messages', agentMsg.id, {
      data: { ...currentData, plan },
    })
  }

  const updatePayload: any = {
    title: plan?.title || `Docs: ${item.title || 'Work item'}`,
    description: plan?.description || `Documentation for ${item.title || 'work item'}`,
    data: {
      work_item_id: item_id,
      doc_type: plan?.doc_type || 'internal_note',
      audience: plan?.audience || 'engineering',
      status: 'draft',
      content_outline: plan?.content_outline || '',
      known_limitations: Array.isArray(plan?.known_limitations) ? plan.known_limitations : [],
      notes: plan?.notes || '',
    },
  }

  await adminDataUpdate(ctx, 'items', docsTicketId, updatePayload)

  await adminCreate(ctx, {
    entity: 'links',
    type_slug: 'link',
    link_type_id: linkTypeId,
    link_type: 'workbench_documented_by',
    source_type: 'items',
    source_id: item_id,
    target_type: 'items',
    target_id: docsTicketId,
  } as any)

  return {
    docs_ticket_id: docsTicketId,
    title: updatePayload.title,
    created: true,
    existing: false,
  }
})