import { NextResponse } from "next/server";
import { getData, saveData, type DataStore, type Task } from "@/lib/server/taskDb";
import { getAuthenticatedUser } from "@/lib/server/auth";

export const runtime = "nodejs";

// GET - fetch all tasks, projects, and sprints
export async function GET() {
  try {
    const user = await getAuthenticatedUser();
    if (!user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }
    const data = getData();
    return NextResponse.json(data);
  } catch (error) {
    console.error(">>> API GET: database error:", error);
    return NextResponse.json({ error: "Failed to fetch data" }, { status: 500 });
  }
}

// POST - create or update tasks, projects, or sprints
export async function POST(request: Request) {
  try {
    const user = await getAuthenticatedUser();
    if (!user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const body = await request.json();
    const { task, tasks, projects, sprints } = body as {
      task?: Task;
      tasks?: Task[];
      projects?: DataStore["projects"];
      sprints?: DataStore["sprints"];
    };

    const data = getData();

    if (projects) data.projects = projects;
    if (sprints) data.sprints = sprints;

    if (task) {
      const existingIndex = data.tasks.findIndex((t) => t.id === task.id);
      if (existingIndex >= 0) {
        const existingTask = data.tasks[existingIndex];
        data.tasks[existingIndex] = {
          ...existingTask,
          ...task,
          updatedAt: new Date().toISOString(),
          updatedById: user.id,
          updatedByName: user.name,
          updatedByAvatarUrl: user.avatarUrl,
        };
      } else {
        data.tasks.push({
          ...task,
          id: task.id || Date.now().toString(),
          createdAt: new Date().toISOString(),
          updatedAt: new Date().toISOString(),
          createdById: task.createdById || user.id,
          createdByName: task.createdByName || user.name,
          createdByAvatarUrl: task.createdByAvatarUrl || user.avatarUrl,
          updatedById: user.id,
          updatedByName: user.name,
          updatedByAvatarUrl: user.avatarUrl,
          assigneeId: task.assigneeId || user.id,
          assigneeName: task.assigneeName || user.name,
          assigneeEmail: task.assigneeEmail || user.email,
        });
      }
    }

    if (tasks && Array.isArray(tasks)) {
      data.tasks = tasks.map((entry) => ({
        ...entry,
        createdById: entry.createdById || user.id,
        createdByName: entry.createdByName || user.name,
        createdByAvatarUrl: entry.createdByAvatarUrl || (entry.createdById === user.id ? user.avatarUrl : undefined),
        updatedById: entry.updatedById || user.id,
        updatedByName: entry.updatedByName || user.name,
        updatedByAvatarUrl: entry.updatedByAvatarUrl || (entry.updatedById === user.id ? user.avatarUrl : undefined),
        assigneeId: entry.assigneeId || undefined,
        assigneeName: entry.assigneeName || undefined,
        assigneeEmail: entry.assigneeEmail || undefined,
        assigneeAvatarUrl: undefined,
      }));
    }

    const saved = saveData(data);
    return NextResponse.json({ success: true, data: saved });
  } catch (error) {
    console.error(">>> API POST: database error:", error);
    return NextResponse.json({ error: "Failed to save" }, { status: 500 });
  }
}

// DELETE - remove a task
export async function DELETE(request: Request) {
  try {
    const user = await getAuthenticatedUser();
    if (!user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const { id } = (await request.json()) as { id: string };
    const data = getData();
    data.tasks = data.tasks.filter((t) => t.id !== id);
    saveData(data);
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error(">>> API DELETE: database error:", error);
    return NextResponse.json({ error: "Failed to delete" }, { status: 500 });
  }
}