import { createClient } from '@/lib/supabase/server'
import { NextResponse } from 'next/server'
import { saveMappings } from '@/lib/import/sie-import'
import type { AccountMapping } from '@/lib/import/types'

/**
 * GET /api/import/sie/mappings
 * Get all saved account mappings for the user
 */
export async function GET() {
  const supabase = await createClient()

  const {
    data: { user },
  } = await supabase.auth.getUser()

  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  const { data, error } = await supabase
    .from('sie_account_mappings')
    .select('*')
    .eq('user_id', user.id)
    .order('source_account')

  if (error) {
    return NextResponse.json({ error: error.message }, { status: 500 })
  }

  return NextResponse.json({ data })
}

/**
 * POST /api/import/sie/mappings
 * Save account mappings (bulk upsert)
 */
export async function POST(request: Request) {
  const supabase = await createClient()

  const {
    data: { user },
  } = await supabase.auth.getUser()

  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  const body = await request.json()
  const mappings: AccountMapping[] = body.mappings

  if (!mappings || !Array.isArray(mappings)) {
    return NextResponse.json({ error: 'Invalid mappings data' }, { status: 400 })
  }

  try {
    await saveMappings(supabase, user.id, mappings)
    return NextResponse.json({ success: true })
  } catch (error) {
    return NextResponse.json(
      { error: error instanceof Error ? error.message : 'Failed to save mappings' },
      { status: 500 }
    )
  }
}

/**
 * PUT /api/import/sie/mappings
 * Update a single mapping
 */
export async function PUT(request: Request) {
  const supabase = await createClient()

  const {
    data: { user },
  } = await supabase.auth.getUser()

  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  const body = await request.json()
  const { sourceAccount, targetAccount } = body

  if (!sourceAccount || !targetAccount) {
    return NextResponse.json(
      { error: 'sourceAccount and targetAccount are required' },
      { status: 400 }
    )
  }

  const { data, error } = await supabase
    .from('sie_account_mappings')
    .upsert({
      user_id: user.id,
      source_account: sourceAccount,
      target_account: targetAccount,
      confidence: 1.0,
      match_type: 'manual',
    }, {
      onConflict: 'user_id,source_account',
    })
    .select()
    .single()

  if (error) {
    return NextResponse.json({ error: error.message }, { status: 500 })
  }

  return NextResponse.json({ data })
}

/**
 * DELETE /api/import/sie/mappings
 * Delete a specific mapping or all mappings
 */
export async function DELETE(request: Request) {
  const supabase = await createClient()

  const {
    data: { user },
  } = await supabase.auth.getUser()

  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  const { searchParams } = new URL(request.url)
  const sourceAccount = searchParams.get('sourceAccount')

  if (sourceAccount) {
    // Delete specific mapping
    const { error } = await supabase
      .from('sie_account_mappings')
      .delete()
      .eq('user_id', user.id)
      .eq('source_account', sourceAccount)

    if (error) {
      return NextResponse.json({ error: error.message }, { status: 500 })
    }
  } else {
    // Delete all mappings
    const { error } = await supabase
      .from('sie_account_mappings')
      .delete()
      .eq('user_id', user.id)

    if (error) {
      return NextResponse.json({ error: error.message }, { status: 500 })
    }
  }

  return NextResponse.json({ success: true })
}