// Copyright IBM Corp. 2020, 2026
// SPDX-License-Identifier: BUSL-1.1

package iam

import (
	"context"
	"time"

	"github.com/hashicorp/boundary/internal/errors"
	"github.com/hashicorp/boundary/internal/pagination"
)

// ListRoles lists up to page size roles, filtering out entries that
// do not pass the filter item function. It will automatically request
// more roles from the database, at page size chunks, to fill the page.
// It returns a new list token used to continue pagination or refresh items.
// Roles are ordered by create time descending (most recently created first).
func ListRoles(
	ctx context.Context,
	grantsHash []byte,
	pageSize int,
	filterItemFn pagination.ListFilterFunc[*Role],
	repo *Repository,
	withScopeIds []string,
) (*pagination.ListResponse[*Role], error) {
	const op = "iam.ListRoles"

	switch {
	case len(grantsHash) == 0:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing grants hash")
	case pageSize < 1:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "page size must be at least 1")
	case filterItemFn == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing filter item callback")
	case repo == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing repo")
	case len(withScopeIds) == 0:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing scope ids")
	}

	listItemsFn := func(ctx context.Context, lastPageItem *Role, limit int) ([]*Role, time.Time, error) {
		opts := []Option{
			WithLimit(limit),
		}
		if lastPageItem != nil {
			opts = append(opts, WithStartPageAfterItem(lastPageItem))
		}
		return repo.listRoles(ctx, withScopeIds, opts...)
	}

	return pagination.List(ctx, grantsHash, pageSize, filterItemFn, listItemsFn, repo.estimatedRoleCount)
}

// ListUsers lists up to page size users, filtering out entries that
// do not pass the filter item function. It will automatically request
// more users from the database, at page size chunks, to fill the page.
// It returns a new list token used to continue pagination or refresh items.
// Users are ordered by create time descending (most recently created first).
func ListUsers(
	ctx context.Context,
	grantsHash []byte,
	pageSize int,
	filterItemFn pagination.ListFilterFunc[*User],
	repo *Repository,
	withScopeIds []string,
) (*pagination.ListResponse[*User], error) {
	const op = "iam.ListUsers"

	switch {
	case len(grantsHash) == 0:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing grants hash")
	case pageSize < 1:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "page size must be at least 1")
	case filterItemFn == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing filter item callback")
	case repo == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing repo")
	case withScopeIds == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing scope ids")
	}

	listItemsFn := func(ctx context.Context, lastPageItem *User, limit int) ([]*User, time.Time, error) {
		opts := []Option{
			WithLimit(limit),
		}
		if lastPageItem != nil {
			opts = append(opts, WithStartPageAfterItem(lastPageItem))
		}
		return repo.ListUsers(ctx, withScopeIds, opts...)
	}

	return pagination.List(ctx, grantsHash, pageSize, filterItemFn, listItemsFn, repo.estimatedUserCount)
}

// ListGroups lists up to page size groups, filtering out entries that
// do not pass the filter item function. It will automatically request
// more groups from the database, at page size chunks, to fill the page.
// It returns a new list token used to continue pagination or refresh items.
// Groups are ordered by create time descending (most recently created first).
func ListGroups(
	ctx context.Context,
	grantsHash []byte,
	pageSize int,
	filterItemFn pagination.ListFilterFunc[*Group],
	repo *Repository,
	withScopeIds []string,
) (*pagination.ListResponse[*Group], error) {
	const op = "iam.ListGroups"

	switch {
	case len(grantsHash) == 0:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing grants hash")
	case pageSize < 1:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "page size must be at least 1")
	case filterItemFn == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing filter item callback")
	case repo == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing repo")
	case withScopeIds == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing scope ids")
	}

	listItemsFn := func(ctx context.Context, lastPageItem *Group, limit int) ([]*Group, time.Time, error) {
		opts := []Option{
			WithLimit(limit),
		}
		if lastPageItem != nil {
			opts = append(opts, WithStartPageAfterItem(lastPageItem))
		}
		return repo.listGroups(ctx, withScopeIds, opts...)
	}

	return pagination.List(ctx, grantsHash, pageSize, filterItemFn, listItemsFn, repo.estimatedGroupCount)
}

// ListScopes lists up to page size scopes, filtering out entries that
// do not pass the filter item function. It will automatically request
// more scopes from the database, at page size chunks, to fill the page.
// It returns a new list token used to continue pagination or refresh items.
// Scopes are ordered by create time descending (most recently created first).
func ListScopes(
	ctx context.Context,
	grantsHash []byte,
	pageSize int,
	filterItemFn pagination.ListFilterFunc[*Scope],
	repo *Repository,
	withParentIds []string,
) (*pagination.ListResponse[*Scope], error) {
	const op = "iam.ListScopes"

	switch {
	case len(grantsHash) == 0:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing grants hash")
	case pageSize < 1:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "page size must be at least 1")
	case filterItemFn == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing filter item callback")
	case repo == nil:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing repo")
	case len(withParentIds) == 0:
		return nil, errors.New(ctx, errors.InvalidParameter, op, "missing parent ids")
	}

	listItemsFn := func(ctx context.Context, lastPageItem *Scope, limit int) ([]*Scope, time.Time, error) {
		opts := []Option{
			WithLimit(limit),
		}
		if lastPageItem != nil {
			opts = append(opts, WithStartPageAfterItem(lastPageItem))
		}
		return repo.listScopes(ctx, withParentIds, opts...)
	}

	return pagination.List(ctx, grantsHash, pageSize, filterItemFn, listItemsFn, repo.estimatedScopeCount)
}
