import { query } from '../../utils/db'
import { getCurrentUserId } from '../../utils/user'

/**
 * TODO 목록 조회
 * GET /api/todo/list
 */
export default defineEventHandler(async (event) => {
  const params = getQuery(event)
  const userId = await getCurrentUserId(event)
  
  const status = params.status as string | null
  const assigneeId = params.assigneeId ? Number(params.assigneeId) : null
  const projectId = params.projectId ? Number(params.projectId) : null
  const meetingId = params.meetingId ? Number(params.meetingId) : null
  const myOnly = params.myOnly === 'true'
  
  const conditions: string[] = []
  const values: any[] = []
  let paramIndex = 1
  
  if (status) {
    conditions.push(`t.status = $${paramIndex++}`)
    values.push(status)
  }
  
  if (assigneeId) {
    conditions.push(`t.assignee_id = $${paramIndex++}`)
    values.push(assigneeId)
  }
  
  if (projectId) {
    conditions.push(`t.project_id = $${paramIndex++}`)
    values.push(projectId)
  }
  
  if (meetingId) {
    conditions.push(`t.meeting_id = $${paramIndex++}`)
    values.push(meetingId)
  }
  
  if (myOnly && userId) {
    conditions.push(`(t.assignee_id = $${paramIndex} OR t.reporter_id = $${paramIndex})`)
    values.push(userId)
    paramIndex++
  }
  
  const whereClause = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : ''
  
  const sql = `
    SELECT 
      t.*,
      p.project_name,
      m.meeting_title,
      a.employee_name as assignee_name,
      r.employee_name as reporter_name
    FROM wr_todo t
    LEFT JOIN wr_project_info p ON t.project_id = p.project_id
    LEFT JOIN wr_meeting m ON t.meeting_id = m.meeting_id
    LEFT JOIN wr_employee_info a ON t.assignee_id = a.employee_id
    LEFT JOIN wr_employee_info r ON t.reporter_id = r.employee_id
    ${whereClause}
    ORDER BY 
      CASE t.status WHEN 'PENDING' THEN 1 WHEN 'IN_PROGRESS' THEN 2 WHEN 'COMPLETED' THEN 3 ELSE 4 END,
      t.priority DESC,
      t.due_date ASC NULLS LAST,
      t.created_at DESC
    LIMIT 100
  `
  
  const todos = await query(sql, values)
  
  return {
    todos: todos.map((t: any) => ({
      todoId: t.todo_id,
      todoTitle: t.todo_title,
      todoContent: t.todo_content,
      sourceType: t.source_type,
      sourceId: t.source_id,
      meetingId: t.meeting_id,
      meetingTitle: t.meeting_title,
      projectId: t.project_id,
      projectName: t.project_name,
      assigneeId: t.assignee_id,
      assigneeName: t.assignee_name,
      reporterId: t.reporter_id,
      reporterName: t.reporter_name,
      dueDate: t.due_date,
      status: t.status,
      priority: t.priority,
      completedAt: t.completed_at,
      weeklyReportId: t.weekly_report_id,
      createdAt: t.created_at,
      updatedAt: t.updated_at
    }))
  }
})