import { NextRequest, NextResponse } from "next/server"
import { getSessionUser } from "@/lib/auth"
import { query } from "@/lib/db"

export async function GET(request: NextRequest) {
  try {
    const user = await getSessionUser()
    if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

    const { searchParams } = new URL(request.url)
    const search = searchParams.get("search") || ""
    const statusId = searchParams.get("status") || ""

    let sql = `SELECT p.id, p.title, p.proposal_number, p.subtotal, p.total_amount, p.valid_until, p.created_at,
                      ps.name AS status_name, ps.color AS status_color,
                      u.first_name || ' ' || u.last_name AS created_by_name
               FROM proposals p
               JOIN proposal_statuses ps ON ps.id = p.status_id
               JOIN users u ON u.id = p.created_by
               WHERE p.deleted_at IS NULL`

    const params: any[] = []
    let idx = 1

    if (search) {
      sql += ` AND (p.title ILIKE $${idx} OR p.proposal_number ILIKE $${idx})`
      params.push(`%${search}%`)
      idx++
    }
    if (statusId) {
      sql += ` AND p.status_id = $${idx}`
      params.push(statusId)
      idx++
    }

    sql += ` ORDER BY p.created_at DESC LIMIT 50`

    const result = await query(sql, params)
    return NextResponse.json(result.rows)
  } catch (error) {
    console.error("Proposals API error:", error)
    const message = error instanceof Error ? error.message : "Failed to load proposals"
    return NextResponse.json({ error: message }, { status: 500 })
  }
}

export async function POST(request: NextRequest) {
  try {
    const user = await getSessionUser()
    if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

    const body = await request.json()
    const draftStatus = await query("SELECT id FROM proposal_statuses WHERE name = 'Draft'")
    const statusId = draftStatus.rows[0]?.id

    const numResult = await query("SELECT COALESCE(MAX(SUBSTRING(proposal_number FROM 'Q-(\\d+)')::INT), 0) + 1 AS next_num FROM proposals WHERE deleted_at IS NULL")
    const nextNum = numResult.rows[0]?.next_num || 1
    const proposalNumber = `Q-${String(nextNum).padStart(4, "0")}`

    const result = await query(
      `INSERT INTO proposals (lead_id, customer_id, title, proposal_number, status_id, content, subtotal, tax_percent, tax_amount, total_amount, valid_until, notes, terms, created_by)
       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14) RETURNING id`,
      [
        body.leadId || null,
        body.customerId || null,
        body.title,
        proposalNumber,
        statusId,
        body.content ? JSON.stringify(body.content) : null,
        body.subtotal || 0,
        body.taxPercent !== undefined ? body.taxPercent : 15,
        body.taxAmount || 0,
        body.totalAmount || 0,
        body.validUntil || null,
        body.notes || null,
        body.terms || null,
        user.id,
      ]
    )

    return NextResponse.json({ success: true, id: result.rows[0].id, proposalNumber }, { status: 201 })
  } catch (error) {
    console.error("Proposals POST error:", error)
    const message = error instanceof Error ? error.message : "Failed to create proposal"
    return NextResponse.json({ error: message }, { status: 500 })
  }
}