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

package workspace

import (
	"bytes"
	"context"
	"crypto/rand"
	"strings"

	"connectrpc.com/connect"
	"github.com/google/uuid"
	"google.golang.org/protobuf/proto"

	eventV1 "pocka.jp/x/yamori/proto/go/backend/events/v1"
	errorV1 "pocka.jp/x/yamori/proto/go/error/v1"
	workspaceV2 "pocka.jp/x/yamori/proto/go/workspace/v2"

	"pocka.jp/x/yamori/backend/core/event"
	"pocka.jp/x/yamori/backend/core/projection"
	"pocka.jp/x/yamori/backend/crypto"
	workspaceEvent "pocka.jp/x/yamori/backend/events/workspace"
)

func (s *Service) CreateInitialAdmin(
	ctx context.Context,
	req *connect.Request[workspaceV2.CreateInitialAdminRequest],
) (*connect.Response[workspaceV2.CreateInitialAdminResponse], error) {
	initialAdminPassword := req.Msg.GetInitialAdminPassword()
	if initialAdminPassword == "" {
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_MissingFieldError{
				MissingFieldError: &errorV1.MissingFieldError{
					Path: proto.String("initial_admin_password"),
				},
			},
		}), nil
	}

	name := req.Msg.GetName()
	if name == "" {
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_MissingFieldError{
				MissingFieldError: &errorV1.MissingFieldError{
					Path: proto.String("name"),
				},
			},
		}), nil
	}

	// TODO: SystemError 以外にする
	if strings.Trim(name, " \r\n\t") != name {
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_SystemError{
				SystemError: &errorV1.SystemError{
					Message: proto.String("Name cannot have heading or trailing spaces"),
				},
			},
		}), nil
	}

	displayName := strings.Trim(req.Msg.GetDisplayName(), " \r\n\t")
	if displayName == "" {
		displayName = name
	}

	password := req.Msg.GetPassword()
	if password == "" {
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_MissingFieldError{
				MissingFieldError: &errorV1.MissingFieldError{
					Path: proto.String("password"),
				},
			},
		}), nil
	}

	// TODO: SystemError 以外にする
	if len(password) <= 8 {
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_SystemError{
				SystemError: &errorV1.SystemError{
					Message: proto.String("Password has to be longer than or equals to 8 bytes"),
				},
			},
		}), nil
	}

	tx, err := s.core.DB.Begin()
	if err != nil {
		return nil, err
	}
	defer tx.Rollback()

	ws, err := projection.GetWorkspace(tx)
	if err != nil {
		return nil, err
	}

	pw, err := projection.GetAdminCreationPassword(tx)
	if err != nil {
		return nil, err
	}

	users, err := projection.GetUsers(tx)
	if err != nil {
		return nil, err
	}

	if err := event.UpdateProjections(tx, ws, pw, users); err != nil {
		return nil, err
	}

	if pw.Projection.Password == nil {
		tx.Commit()
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_PasswordExpired{
				PasswordExpired: &errorV1.AuthenticationError{},
			},
		}), nil
	}

	hash := crypto.HashPassword([]byte(initialAdminPassword), pw.Projection.Password.Salt)
	if !bytes.Equal(hash, pw.Projection.Password.Hash) {
		return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
			Result: &workspaceV2.CreateInitialAdminResponse_AuthenticationError{
				AuthenticationError: &errorV1.AuthenticationError{},
			},
		}), nil
	}

	for _, u := range users.Projection.Users {
		if u.GetName() == name {
			// TODO: SystemError 以外にする
			return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
				Result: &workspaceV2.CreateInitialAdminResponse_SystemError{
					SystemError: &errorV1.SystemError{
						Message: proto.String("User with same name already exists."),
					},
				},
			}), nil
		}
	}

	id, err := uuid.NewRandom()
	if err != nil {
		return nil, err
	}

	keyID := make([]byte, 32)
	rand.Read(keyID)

	err = event.AppendEvents(tx, []*eventV1.Event{
		workspaceEvent.ExpireAdminCreationPassword(),
		workspaceEvent.CreateUser(id.String(), name, displayName, keyID),
		workspaceEvent.GrantAdminAccess(id.String()),
		workspaceEvent.ConfigurePasswordLogin(id.String(), password),
	})
	if err != nil {
		return nil, err
	}

	if err := tx.Commit(); err != nil {
		return nil, err
	}

	return connect.NewResponse(&workspaceV2.CreateInitialAdminResponse{
		Result: &workspaceV2.CreateInitialAdminResponse_Ok{
			Ok: &workspaceV2.User{
				Id: &workspaceV2.UserID{
					Value: proto.String(id.String()),
				},
				Name:        proto.String(name),
				DisplayName: proto.String(displayName),
				IsAdmin:     proto.Bool(true),
			},
		},
	}), nil
}