import { execute, queryOne } from '../../../utils/db'

interface UpdateTodoBody {
  todoTitle?: string
  todoContent?: string
  projectId?: number | null
  assigneeId?: number | null
  dueDate?: string | null
  status?: string
  priority?: number
}

/**
 * TODO 수정
 * PUT /api/todo/[id]/update
 */
export default defineEventHandler(async (event) => {
  const todoId = Number(getRouterParam(event, 'id'))
  const body = await readBody<UpdateTodoBody>(event)
  
  const existing = await queryOne('SELECT * FROM wr_todo WHERE todo_id = $1', [todoId])
  if (!existing) {
    throw createError({ statusCode: 404, message: 'TODO를 찾을 수 없습니다.' })
  }
  
  const updates: string[] = []
  const values: any[] = []
  let paramIndex = 1
  
  if (body.todoTitle !== undefined) {
    updates.push(`todo_title = $${paramIndex++}`)
    values.push(body.todoTitle)
  }
  
  if (body.todoContent !== undefined) {
    updates.push(`todo_content = $${paramIndex++}`)
    values.push(body.todoContent)
  }
  
  if (body.projectId !== undefined) {
    updates.push(`project_id = $${paramIndex++}`)
    values.push(body.projectId)
  }
  
  if (body.assigneeId !== undefined) {
    updates.push(`assignee_id = $${paramIndex++}`)
    values.push(body.assigneeId)
  }
  
  if (body.dueDate !== undefined) {
    updates.push(`due_date = $${paramIndex++}`)
    values.push(body.dueDate)
  }
  
  if (body.status !== undefined) {
    updates.push(`status = $${paramIndex++}`)
    values.push(body.status)
    
    // 완료 상태로 변경 시 완료일시 기록
    if (body.status === 'COMPLETED') {
      updates.push(`completed_at = NOW()`)
    } else if (existing.status === 'COMPLETED') {
      updates.push(`completed_at = NULL`)
    }
  }
  
  if (body.priority !== undefined) {
    updates.push(`priority = $${paramIndex++}`)
    values.push(body.priority)
  }
  
  if (updates.length === 0) {
    return { success: true, message: '변경된 내용이 없습니다.' }
  }
  
  updates.push('updated_at = NOW()')
  values.push(todoId)
  
  await execute(`
    UPDATE wr_todo SET ${updates.join(', ')} WHERE todo_id = $${paramIndex}
  `, values)
  
  return { success: true }
})