import { Response } from 'express';
import { AuthenticatedRequest } from '../types';
import * as roleService from '../services/role.service';
import { CreateRoleInput, UpdateRoleInput } from '../validators/role.validator';

/**
 * GET /roles
 * List all roles (all authenticated users)
 */
export async function getAllRoles(
  _req: AuthenticatedRequest,
  res: Response
): Promise<void> {
  try {
    const roles = await roleService.getAll();

    res.status(200).json({
      success: true,
      message: 'Roles retrieved successfully',
      data: roles,
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Failed to retrieve roles';
    res.status(500).json({
      success: false,
      error: message,
    });
  }
}

/**
 * GET /roles/:id
 * Get a single role by ID with user count (all authenticated users)
 */
export async function getRoleById(
  req: AuthenticatedRequest,
  res: Response
): Promise<void> {
  try {
    const roleId = req.params.id;

    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
    if (!uuidRegex.test(roleId)) {
      res.status(400).json({
        success: false,
        error: 'Invalid role ID',
      });
      return;
    }

    const role = await roleService.getById(roleId);

    if (!role) {
      res.status(404).json({
        success: false,
        error: 'Role not found',
      });
      return;
    }

    res.status(200).json({
      success: true,
      message: 'Role retrieved successfully',
      data: role,
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Failed to retrieve role';
    res.status(500).json({
      success: false,
      error: message,
    });
  }
}

/**
 * POST /roles
 * Create a new role (admin only)
 */
export async function createRole(
  req: AuthenticatedRequest,
  res: Response
): Promise<void> {
  try {
    const data = req.body as CreateRoleInput;

    const role = await roleService.create({
      name: data.name,
      description: data.description,
      permissions: data.permissions as Record<string, unknown> | undefined,
    });

    res.status(201).json({
      success: true,
      message: 'Role created successfully',
      data: role,
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Failed to create role';

    if (message === 'Role name already exists') {
      res.status(409).json({
        success: false,
        error: message,
      });
      return;
    }

    res.status(500).json({
      success: false,
      error: message,
    });
  }
}

/**
 * PUT /roles/:id
 * Update a role (admin only)
 */
export async function updateRole(
  req: AuthenticatedRequest,
  res: Response
): Promise<void> {
  try {
    const roleId = req.params.id;

    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
    if (!uuidRegex.test(roleId)) {
      res.status(400).json({
        success: false,
        error: 'Invalid role ID',
      });
      return;
    }

    const data = req.body as UpdateRoleInput;

    const role = await roleService.update(roleId, {
      name: data.name,
      description: data.description,
      permissions: data.permissions as Record<string, unknown> | undefined,
    });

    if (!role) {
      res.status(404).json({
        success: false,
        error: 'Role not found',
      });
      return;
    }

    res.status(200).json({
      success: true,
      message: 'Role updated successfully',
      data: role,
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Failed to update role';

    if (message === 'Role name already exists') {
      res.status(409).json({
        success: false,
        error: message,
      });
      return;
    }

    res.status(500).json({
      success: false,
      error: message,
    });
  }
}

/**
 * DELETE /roles/:id
 * Delete a role (admin only, only if no users assigned)
 */
export async function deleteRole(
  req: AuthenticatedRequest,
  res: Response
): Promise<void> {
  try {
    const roleId = req.params.id;

    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
    if (!uuidRegex.test(roleId)) {
      res.status(400).json({
        success: false,
        error: 'Invalid role ID',
      });
      return;
    }

    const deleted = await roleService.deleteRole(roleId);

    if (!deleted) {
      res.status(404).json({
        success: false,
        error: 'Role not found',
      });
      return;
    }

    res.status(200).json({
      success: true,
      message: 'Role deleted successfully',
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Failed to delete role';

    // Handle case where users are assigned to the role
    if (message.includes('Cannot delete role')) {
      res.status(409).json({
        success: false,
        error: message,
      });
      return;
    }

    res.status(500).json({
      success: false,
      error: message,
    });
  }
}