"use server";

import { auth } from "@/auth";
import { db } from "@/lib/db";
import { revalidatePath } from "next/cache";
import { z } from "zod";
import { ProjectStatus } from "@prisma/client";

const createProjectSchema = z.object({
  name: z.string().min(1).max(100),
  code: z.string().min(1).max(20).toUpperCase(),
  showId: z.string().min(1).max(10).regex(/^[A-Z0-9_]+$/i, "1–10 chars, letters/numbers/underscores").toUpperCase(),
  projectType: z.enum(["STANDARD", "EPISODIC"]).default("STANDARD"),
  description: z.string().optional(),
  clientId: z.string().cuid().optional(),
  dueDate: z.string().optional(),
  deadline: z.union([z.string(), z.date()]).optional(),
  startDate: z.string().optional(),
  slackWebhook: z.string().url().optional().or(z.literal("")),
  slackChannel: z.string().optional(),
});

export async function createProject(data: z.infer<typeof createProjectSchema>) {
  const session = await auth();
  if (!session?.user) throw new Error("Unauthorized");
  if (!["ADMIN", "PRODUCER"].includes(session.user.role)) {
    throw new Error("Insufficient permissions");
  }

  const parsed = createProjectSchema.parse(data);

  // Verify the session user still exists in the DB (guards against stale JWT after a DB reset)
  const dbUser = await db.user.findUnique({
    where: { id: session.user.id },
    select: { id: true },
  });
  if (!dbUser) throw new Error("Session expired — please sign out and sign back in.");

  const project = await db.project.create({
    data: {
      name: parsed.name,
      code: parsed.code,
      showId: parsed.showId,
      projectType: parsed.projectType,
      description: parsed.description,
      clientId: parsed.clientId || undefined,
      producerId: session.user.id,
      dueDate: parsed.dueDate
        ? new Date(parsed.dueDate)
        : parsed.deadline
        ? new Date(parsed.deadline)
        : undefined,
      startDate: parsed.startDate ? new Date(parsed.startDate) : undefined,
      slackWebhook: parsed.slackWebhook || undefined,
      slackChannel: parsed.slackChannel || undefined,
    },
    include: { client: true },
  });

  revalidatePath("/projects");
  return { success: true, project };
}

const updateProjectSchema = z.object({
  id: z.string().cuid(),
  name: z.string().min(1).max(100).optional(),
  code: z.string().min(1).max(20).optional(),
  showId: z.string().min(1).max(10).regex(/^[A-Z0-9_]+$/i).toUpperCase().optional(),
  projectType: z.enum(["STANDARD", "EPISODIC"]).optional(),
  description: z.string().optional().nullable(),
  status: z.nativeEnum(ProjectStatus).optional(),
  clientId: z.string().cuid().optional().nullable(),
  producerId: z.string().cuid().optional().nullable(),
  supervisorId: z.string().cuid().optional().nullable(),
  dueDate: z.string().optional().nullable(),
  startDate: z.string().optional().nullable(),
  slackWebhook: z.string().url().optional().or(z.literal("")).nullable(),
  slackChannel: z.string().optional().nullable(),
});

export async function updateProject(data: z.infer<typeof updateProjectSchema>) {
  const session = await auth();
  if (!session?.user) throw new Error("Unauthorized");
  if (!["ADMIN", "PRODUCER", "SUPERVISOR"].includes(session.user.role)) {
    throw new Error("Insufficient permissions");
  }

  const { id, ...rest } = updateProjectSchema.parse(data);

  const updated = await db.project.update({
    where: { id },
    data: {
      ...(rest.name !== undefined && { name: rest.name }),
      ...(rest.code !== undefined && { code: rest.code.toUpperCase() }),
      ...(rest.showId !== undefined && { showId: rest.showId }),
      ...(rest.projectType !== undefined && { projectType: rest.projectType }),
      ...(rest.description !== undefined && { description: rest.description ?? undefined }),
      ...(rest.status !== undefined && { status: rest.status }),
      ...(rest.clientId !== undefined && { clientId: rest.clientId }),
      ...(rest.producerId !== undefined && { producerId: rest.producerId }),
      ...(rest.supervisorId !== undefined && { supervisorId: rest.supervisorId }),
      ...(rest.dueDate !== undefined && { dueDate: rest.dueDate ? new Date(rest.dueDate) : null }),
      ...(rest.startDate !== undefined && { startDate: rest.startDate ? new Date(rest.startDate) : null }),
      ...(rest.slackWebhook !== undefined && { slackWebhook: rest.slackWebhook || null }),
      ...(rest.slackChannel !== undefined && { slackChannel: rest.slackChannel || null }),
    },
  });

  revalidatePath(`/projects/${id}`);
  revalidatePath("/projects");
  return { success: true, project: updated };
}

export async function updateProjectStatus(
  projectId: string,
  status: ProjectStatus
) {
  const session = await auth();
  if (!session?.user) throw new Error("Unauthorized");
  if (!["ADMIN", "PRODUCER"].includes(session.user.role)) {
    throw new Error("Insufficient permissions");
  }

  await db.project.update({ where: { id: projectId }, data: { status } });
  revalidatePath(`/projects/${projectId}`);
  return { success: true };
}

export async function getProjects() {
  const session = await auth();
  if (!session?.user) throw new Error("Unauthorized");

  // Clients only see their assigned projects
  if (session.user.role === "CLIENT") {
    const access = await db.clientAccess.findMany({
      where: { userId: session.user.id },
      select: { clientId: true },
    });
    const clientIds = access.map((a) => a.clientId);
    return db.project.findMany({
      where: { clientId: { in: clientIds }, status: { not: "ARCHIVED" } },
      include: {
        client: true,
        _count: { select: { shots: true } },
      },
      orderBy: { updatedAt: "desc" },
    });
  }

  return db.project.findMany({
    include: {
      client: true,
      producer: { select: { id: true, name: true } },
      _count: { select: { shots: true } },
    },
    orderBy: { updatedAt: "desc" },
  });
}

export async function getProjectById(id: string) {
  const session = await auth();
  if (!session?.user) throw new Error("Unauthorized");

  return db.project.findUnique({
    where: { id },
    include: {
      client: true,
      producer: { select: { id: true, name: true, email: true } },
      supervisor: { select: { id: true, name: true, email: true } },
      shots: {
        include: {
          artist: { select: { id: true, name: true, image: true } },
          _count: { select: { versions: true } },
        },
        orderBy: { shotCode: "asc" },
      },
    },
  });
}