package query

import (
	"context"
	"database/sql"
	errs "errors"
	"time"

	sq "github.com/Masterminds/squirrel"
	"github.com/lib/pq"

	"github.com/caos/zitadel/internal/api/authz"

	"github.com/caos/zitadel/internal/domain"
	"github.com/caos/zitadel/internal/errors"
	"github.com/caos/zitadel/internal/query/projection"
)

type UserGrant struct {
	ID           string
	CreationDate time.Time
	ChangeDate   time.Time
	Sequence     uint64
	Roles        []string
	GrantID      string
	State        domain.UserGrantState

	UserID             string
	Username           string
	UserType           domain.UserType
	UserResourceOwner  string
	FirstName          string
	LastName           string
	Email              string
	DisplayName        string
	AvatarURL          string
	PreferredLoginName string

	ResourceOwner    string
	OrgName          string
	OrgPrimaryDomain string

	ProjectID   string
	ProjectName string
}

type UserGrants struct {
	SearchResponse
	UserGrants []*UserGrant
}

type UserGrantsQueries struct {
	SearchRequest
	Queries []SearchQuery
}

func (q *UserGrantsQueries) toQuery(query sq.SelectBuilder) sq.SelectBuilder {
	query = q.SearchRequest.toQuery(query)
	for _, q := range q.Queries {
		query = q.toQuery(query)
	}
	return query
}

func NewUserGrantUserIDSearchQuery(id string) (SearchQuery, error) {
	return NewTextQuery(UserGrantUserID, id, TextEquals)
}

func NewUserGrantProjectIDSearchQuery(id string) (SearchQuery, error) {
	return NewTextQuery(UserGrantProjectID, id, TextEquals)
}

func NewUserGrantProjectOwnerSearchQuery(id string) (SearchQuery, error) {
	return NewTextQuery(ProjectColumnResourceOwner, id, TextEquals)
}

func NewUserGrantResourceOwnerSearchQuery(id string) (SearchQuery, error) {
	return NewTextQuery(UserGrantResourceOwner, id, TextEquals)
}

func NewUserGrantGrantIDSearchQuery(id string) (SearchQuery, error) {
	return NewTextQuery(UserGrantGrantID, id, TextEquals)
}

func NewUserGrantUserTypeQuery(typ domain.UserType) (SearchQuery, error) {
	return NewNumberQuery(UserTypeCol, typ, NumberEquals)
}

func NewUserGrantDisplayNameQuery(displayName string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanDisplayNameCol, displayName, method)
}

func NewUserGrantEmailQuery(email string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanEmailCol, email, method)
}

func NewUserGrantFirstNameQuery(value string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanFirstNameCol, value, method)
}

func NewUserGrantLastNameQuery(value string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanLastNameCol, value, method)
}

func NewUserGrantUsernameQuery(value string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(UserUsernameCol, value, method)
}

func NewUserGrantDomainQuery(value string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(OrgColumnDomain, value, method)
}

func NewUserGrantOrgNameQuery(value string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(OrgColumnName, value, method)
}

func NewUserGrantProjectNameQuery(value string, method TextComparison) (SearchQuery, error) {
	return NewTextQuery(ProjectColumnName, value, method)
}

func NewUserGrantRoleQuery(value string) (SearchQuery, error) {
	return NewTextQuery(UserGrantRoles, value, TextListContains)
}

func NewUserGrantWithGrantedQuery(owner string) (SearchQuery, error) {
	orgQuery, err := NewUserGrantResourceOwnerSearchQuery(owner)
	if err != nil {
		return nil, err
	}
	projectQuery, err := NewUserGrantProjectOwnerSearchQuery(owner)
	if err != nil {
		return nil, err
	}
	return newOrQuery(orgQuery, projectQuery)
}

func NewUserGrantContainsRolesSearchQuery(roles ...string) (SearchQuery, error) {
	r := make([]interface{}, len(roles))
	for i, role := range roles {
		r[i] = role
	}
	return NewListQuery(UserGrantRoles, r, ListIn)
}

var (
	userGrantTable = table{
		name: projection.UserGrantProjectionTable,
	}
	UserGrantID = Column{
		name:  projection.UserGrantID,
		table: userGrantTable,
	}
	UserGrantResourceOwner = Column{
		name:  projection.UserGrantResourceOwner,
		table: userGrantTable,
	}
	UserGrantInstanceID = Column{
		name:  projection.UserGrantInstanceID,
		table: userGrantTable,
	}
	UserGrantCreationDate = Column{
		name:  projection.UserGrantCreationDate,
		table: userGrantTable,
	}
	UserGrantChangeDate = Column{
		name:  projection.UserGrantChangeDate,
		table: userGrantTable,
	}
	UserGrantSequence = Column{
		name:  projection.UserGrantSequence,
		table: userGrantTable,
	}
	UserGrantUserID = Column{
		name:  projection.UserGrantUserID,
		table: userGrantTable,
	}
	UserGrantProjectID = Column{
		name:  projection.UserGrantProjectID,
		table: userGrantTable,
	}
	UserGrantGrantID = Column{
		name:  projection.UserGrantGrantID,
		table: userGrantTable,
	}
	UserGrantRoles = Column{
		name:  projection.UserGrantRoles,
		table: userGrantTable,
	}
	UserGrantState = Column{
		name:  projection.UserGrantState,
		table: userGrantTable,
	}
)

func (q *Queries) UserGrant(ctx context.Context, queries ...SearchQuery) (*UserGrant, error) {
	query, scan := prepareUserGrantQuery()
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.
		Where(sq.Eq{
			UserGrantInstanceID.identifier(): authz.GetInstance(ctx).InstanceID(),
		}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-Fa1KW", "Errors.Query.SQLStatement")
	}

	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *Queries) UserGrants(ctx context.Context, queries *UserGrantsQueries) (*UserGrants, error) {
	query, scan := prepareUserGrantsQuery()
	stmt, args, err := queries.toQuery(query).
		Where(sq.Eq{
			UserGrantInstanceID.identifier(): authz.GetInstance(ctx).InstanceID(),
		}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-wXnQR", "Errors.Query.SQLStatement")
	}

	latestSequence, err := q.latestSequence(ctx, userGrantTable)
	if err != nil {
		return nil, err
	}

	rows, err := q.client.QueryContext(ctx, stmt, args...)
	if err != nil {
		return nil, err
	}
	grants, err := scan(rows)
	if err != nil {
		return nil, err
	}

	grants.LatestSequence = latestSequence
	return grants, nil
}

func prepareUserGrantQuery() (sq.SelectBuilder, func(*sql.Row) (*UserGrant, error)) {
	return sq.Select(
			UserGrantID.identifier(),
			UserGrantCreationDate.identifier(),
			UserGrantChangeDate.identifier(),
			UserGrantSequence.identifier(),
			UserGrantGrantID.identifier(),
			UserGrantRoles.identifier(),
			UserGrantState.identifier(),

			UserGrantUserID.identifier(),
			UserUsernameCol.identifier(),
			UserTypeCol.identifier(),
			UserResourceOwnerCol.identifier(),
			HumanFirstNameCol.identifier(),
			HumanLastNameCol.identifier(),
			HumanEmailCol.identifier(),
			HumanDisplayNameCol.identifier(),
			HumanAvatarURLCol.identifier(),
			LoginNameNameCol.identifier(),

			UserGrantResourceOwner.identifier(),
			OrgColumnName.identifier(),
			OrgColumnDomain.identifier(),

			UserGrantProjectID.identifier(),
			ProjectColumnName.identifier(),
		).
			From(userGrantTable.identifier()).
			LeftJoin(join(UserIDCol, UserGrantUserID)).
			LeftJoin(join(HumanUserIDCol, UserGrantUserID)).
			LeftJoin(join(OrgColumnID, UserGrantResourceOwner)).
			LeftJoin(join(ProjectColumnID, UserGrantProjectID)).
			LeftJoin(join(LoginNameUserIDCol, UserGrantUserID)).
			Where(
				sq.Eq{LoginNameIsPrimaryCol.identifier(): true},
			).PlaceholderFormat(sq.Dollar),
		func(row *sql.Row) (*UserGrant, error) {
			g := new(UserGrant)

			var (
				roles              = pq.StringArray{}
				username           sql.NullString
				firstName          sql.NullString
				userType           sql.NullInt32
				userOwner          sql.NullString
				lastName           sql.NullString
				email              sql.NullString
				displayName        sql.NullString
				avatarURL          sql.NullString
				preferredLoginName sql.NullString

				orgName   sql.NullString
				orgDomain sql.NullString

				projectName sql.NullString
			)

			err := row.Scan(
				&g.ID,
				&g.CreationDate,
				&g.ChangeDate,
				&g.Sequence,
				&g.GrantID,
				&roles,
				&g.State,

				&g.UserID,
				&username,
				&userType,
				&userOwner,
				&firstName,
				&lastName,
				&email,
				&displayName,
				&avatarURL,
				&preferredLoginName,

				&g.ResourceOwner,
				&orgName,
				&orgDomain,

				&g.ProjectID,
				&projectName,
			)
			if err != nil {
				if errs.Is(err, sql.ErrNoRows) {
					return nil, errors.ThrowNotFound(err, "QUERY-wIPkA", "Errors.UserGrant.NotFound")
				}
				return nil, errors.ThrowInternal(err, "QUERY-oQPcP", "Errors.Internal")
			}

			g.Roles = roles
			g.Username = username.String
			g.UserType = domain.UserType(userType.Int32)
			g.UserResourceOwner = userOwner.String
			g.FirstName = firstName.String
			g.LastName = lastName.String
			g.Email = email.String
			g.DisplayName = displayName.String
			g.AvatarURL = avatarURL.String
			g.PreferredLoginName = preferredLoginName.String
			g.OrgName = orgName.String
			g.OrgPrimaryDomain = orgDomain.String
			g.ProjectName = projectName.String

			return g, nil
		}
}

func prepareUserGrantsQuery() (sq.SelectBuilder, func(*sql.Rows) (*UserGrants, error)) {
	return sq.Select(
			UserGrantID.identifier(),
			UserGrantCreationDate.identifier(),
			UserGrantChangeDate.identifier(),
			UserGrantSequence.identifier(),
			UserGrantGrantID.identifier(),
			UserGrantRoles.identifier(),
			UserGrantState.identifier(),

			UserGrantUserID.identifier(),
			UserUsernameCol.identifier(),
			UserTypeCol.identifier(),
			UserResourceOwnerCol.identifier(),
			HumanFirstNameCol.identifier(),
			HumanLastNameCol.identifier(),
			HumanEmailCol.identifier(),
			HumanDisplayNameCol.identifier(),
			HumanAvatarURLCol.identifier(),
			LoginNameNameCol.identifier(),

			UserGrantResourceOwner.identifier(),
			OrgColumnName.identifier(),
			OrgColumnDomain.identifier(),

			UserGrantProjectID.identifier(),
			ProjectColumnName.identifier(),

			countColumn.identifier(),
		).
			From(userGrantTable.identifier()).
			LeftJoin(join(UserIDCol, UserGrantUserID)).
			LeftJoin(join(HumanUserIDCol, UserGrantUserID)).
			LeftJoin(join(OrgColumnID, UserGrantResourceOwner)).
			LeftJoin(join(ProjectColumnID, UserGrantProjectID)).
			LeftJoin(join(LoginNameUserIDCol, UserGrantUserID)).
			Where(
				sq.Eq{LoginNameIsPrimaryCol.identifier(): true},
			).PlaceholderFormat(sq.Dollar),
		func(rows *sql.Rows) (*UserGrants, error) {
			userGrants := make([]*UserGrant, 0)
			var count uint64
			for rows.Next() {
				g := new(UserGrant)

				var (
					roles              = pq.StringArray{}
					username           sql.NullString
					userType           sql.NullInt32
					userOwner          sql.NullString
					firstName          sql.NullString
					lastName           sql.NullString
					email              sql.NullString
					displayName        sql.NullString
					avatarURL          sql.NullString
					preferredLoginName sql.NullString

					orgName   sql.NullString
					orgDomain sql.NullString

					projectName sql.NullString
				)

				err := rows.Scan(
					&g.ID,
					&g.CreationDate,
					&g.ChangeDate,
					&g.Sequence,
					&g.GrantID,
					&roles,
					&g.State,

					&g.UserID,
					&username,
					&userType,
					&userOwner,
					&firstName,
					&lastName,
					&email,
					&displayName,
					&avatarURL,
					&preferredLoginName,

					&g.ResourceOwner,
					&orgName,
					&orgDomain,

					&g.ProjectID,
					&projectName,

					&count,
				)
				if err != nil {
					return nil, err
				}

				g.Roles = roles
				g.Username = username.String
				g.UserType = domain.UserType(userType.Int32)
				g.UserResourceOwner = userOwner.String
				g.FirstName = firstName.String
				g.LastName = lastName.String
				g.Email = email.String
				g.DisplayName = displayName.String
				g.AvatarURL = avatarURL.String
				g.PreferredLoginName = preferredLoginName.String
				g.OrgName = orgName.String
				g.OrgPrimaryDomain = orgDomain.String
				g.ProjectName = projectName.String

				userGrants = append(userGrants, g)
			}

			if err := rows.Close(); err != nil {
				return nil, errors.ThrowInternal(err, "QUERY-iGvmP", "Errors.Query.CloseRows")
			}

			return &UserGrants{
				UserGrants: userGrants,
				SearchResponse: SearchResponse{
					Count: count,
				},
			}, nil
		}
}