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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

package projection

import (
	"database/sql"
	"slices"

	"google.golang.org/protobuf/proto"
	"pocka.jp/x/yamori/backend/core/event"
	"pocka.jp/x/yamori/backend/core/snapshot"
	workspaceEventsv1 "pocka.jp/x/yamori/proto/go/backend/events/workspace/v1"
	workspace "pocka.jp/x/yamori/proto/go/backend/projections/workspace/v1"
	"pocka.jp/x/yamori/proto/go/backend/workspace/v1/types"
)

type Users struct {
	hasSnapshot bool
	eventSeq    *uint64

	Projection *workspace.Users

	permissions map[string]map[types.Permission]struct{}
}

func NewUsers() *Users {
	return &Users{
		hasSnapshot: false,
		eventSeq:    nil,
		Projection: &workspace.Users{
			Users: []*workspace.Users_User{},
		},
		permissions: make(map[string]map[types.Permission]struct{}),
	}
}

func GetUsers(tx *sql.Tx) (*Users, error) {
	payload, seq, err := snapshot.GetLatest[workspace.Users](tx)
	if err != nil {
		return nil, err
	}

	if payload == nil {
		return NewUsers(), nil
	}

	permissions := make(map[string]map[types.Permission]struct{})
	for _, u := range payload.Users {
		perms := make(map[types.Permission]struct{})

		for _, p := range u.Permissions {
			perms[p] = struct{}{}
		}

		permissions[u.GetId()] = perms
	}

	return &Users{
		hasSnapshot: true,
		eventSeq:    &seq,
		Projection:  payload,
		permissions: permissions,
	}, nil
}

func (p *Users) EventSeq() *uint64 {
	return p.eventSeq
}

func (p *Users) Update(events []event.Event) {
	if len(events) == 0 || p.Projection == nil {
		return
	}

	for _, container := range events {
		if p.eventSeq != nil && container.Seq <= *p.eventSeq {
			continue
		}

		ev := container.Payload.GetWorkspaceEvent()
		if ev == nil {
			continue
		}

		p.hasSnapshot = false

		switch ev := ev.Event.(type) {
		case *workspaceEventsv1.Event_UserCreated:
			p.Projection.Users = append(p.Projection.Users, &workspace.Users_User{
				Id:            ev.UserCreated.Id,
				Name:          ev.UserCreated.Name,
				DisplayName:   ev.UserCreated.DisplayName,
				KeyId:         ev.UserCreated.KeyId,
				IsAdmin:       proto.Bool(false),
				PasswordLogin: nil,
			})
			p.permissions[ev.UserCreated.GetId()] = make(map[types.Permission]struct{})
		case *workspaceEventsv1.Event_AdminAccessGranted:
			id := ev.AdminAccessGranted.GetUserId()

			for _, u := range p.Projection.Users {
				if u.GetId() == id {
					u.IsAdmin = proto.Bool(true)
				}
			}
		case *workspaceEventsv1.Event_AdminAccessRevoked:
			id := ev.AdminAccessRevoked.GetUserId()

			for _, u := range p.Projection.Users {
				if u.GetId() == id {
					u.IsAdmin = proto.Bool(false)
				}
			}
		case *workspaceEventsv1.Event_PasswordLoginConfigured:
			id := ev.PasswordLoginConfigured.GetUserId()

			for _, u := range p.Projection.Users {
				if u.GetId() == id {
					u.PasswordLogin = &workspace.Users_PasswordLogin{
						Hash: ev.PasswordLoginConfigured.PasswordHash,
						Salt: ev.PasswordLoginConfigured.PasswordSalt,
					}
				}
			}
		case *workspaceEventsv1.Event_UserPermissionsGranted:
			id := ev.UserPermissionsGranted.GetUserId()

			if p.permissions[id] != nil {
				for _, perm := range ev.UserPermissionsGranted.Permissions {
					p.permissions[id][perm] = struct{}{}
				}
			}
		case *workspaceEventsv1.Event_UserPermissionsRevoked:
			id := ev.UserPermissionsRevoked.GetUserId()

			if p.permissions[id] != nil {
				for _, perm := range ev.UserPermissionsRevoked.Permissions {
					delete(p.permissions[id], perm)
				}
			}
		}

		for _, user := range p.Projection.Users {
			permissions := p.permissions[user.GetId()]

			s := make([]types.Permission, 0, len(permissions))

			for perm := range permissions {
				s = append(s, perm)
			}

			slices.Sort(s)
			user.Permissions = slices.Compact(s)
		}

		p.eventSeq = &container.Seq
	}
}

func (p *Users) SaveSnapshot(tx *sql.Tx) error {
	if p.hasSnapshot || p.eventSeq == nil {
		return nil
	}

	return snapshot.Save(tx, p.Projection, *p.eventSeq)
}