import { NextRequest, NextResponse } from "next/server";
import { getServerSession } from "next-auth/next";
import { authOptions } from "@/lib/auth/authOptions";
import { query } from "@/lib/db-postgres";

// ---------------------------------------------------------------------------
// POST — save a completed discovery phase into the project data
// ---------------------------------------------------------------------------

export async function POST(
  req: NextRequest,
  { params }: { params: Promise<{ projectId: string }> }
) {
  const session = await getServerSession(authOptions);
  if (!session?.user?.email) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const { projectId } = await params;

  let body: { phase: string; title: string; summary: string; data: Record<string, unknown> };
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
  }

  const { phase, title, summary, data } = body;
  if (!phase || !data) {
    return NextResponse.json({ error: "phase and data are required" }, { status: 400 });
  }

  try {
    // Ensure the table has a phases column and merge the new phase in
    await query(`
      CREATE TABLE IF NOT EXISTS atlas_phases (
        project_id TEXT NOT NULL,
        phase      TEXT NOT NULL,
        title      TEXT,
        summary    TEXT,
        data       JSONB NOT NULL DEFAULT '{}'::jsonb,
        saved_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
        PRIMARY KEY (project_id, phase)
      )
    `);

    await query(
      `INSERT INTO atlas_phases (project_id, phase, title, summary, data, saved_at)
       VALUES ($1, $2, $3, $4, $5::jsonb, NOW())
       ON CONFLICT (project_id, phase) DO UPDATE
         SET title    = EXCLUDED.title,
             summary  = EXCLUDED.summary,
             data     = EXCLUDED.data,
             saved_at = NOW()`,
      [projectId, phase, title ?? phase, summary ?? "", JSON.stringify(data)]
    );

    // Also mirror into fs_projects.data.phases for easy access elsewhere
    await query(
      `UPDATE fs_projects
         SET data = jsonb_set(
               COALESCE(data, '{}'::jsonb),
               ARRAY['phases', $2],
               $3::jsonb,
               true
             ),
             updated_at = NOW()
       WHERE id = $1`,
      [projectId, phase, JSON.stringify({ title, summary, data, savedAt: new Date().toISOString() })]
    );

    console.log(`[save-phase] Saved phase "${phase}" for project ${projectId}`);
    return NextResponse.json({ saved: true, phase });
  } catch (err) {
    console.error("[save-phase] Error:", err);
    return NextResponse.json({ error: "Failed to save phase" }, { status: 500 });
  }
}

// ---------------------------------------------------------------------------
// GET — load all saved phases for this project
// ---------------------------------------------------------------------------

export async function GET(
  _req: NextRequest,
  { params }: { params: Promise<{ projectId: string }> }
) {
  const session = await getServerSession(authOptions);
  if (!session?.user?.email) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const { projectId } = await params;

  try {
    const rows = await query<{ phase: string; title: string; summary: string; data: unknown; saved_at: string }>(
      `SELECT phase, title, summary, data, saved_at
         FROM atlas_phases
        WHERE project_id = $1
        ORDER BY saved_at ASC`,
      [projectId]
    );
    return NextResponse.json({ phases: rows });
  } catch {
    return NextResponse.json({ phases: [] });
  }
}