// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package gtsmodel

import (
	"path"
	"strings"
	"time"
)

// AdminActionCategory describes the category
// of entity that this admin action targets.
type AdminActionCategory uint8

// Only ever add new action categories to the *END* of the list
// below, DO NOT insert them before/between other entries!

const (
	AdminActionCategoryUnknown AdminActionCategory = iota
	AdminActionCategoryAccount
	AdminActionCategoryDomain
)

func (c AdminActionCategory) String() string {
	switch c {
	case AdminActionCategoryAccount:
		return "account"
	case AdminActionCategoryDomain:
		return "domain"
	default:
		return "unknown" //nolint:goconst
	}
}

func ParseAdminActionCategory(in string) AdminActionCategory {
	switch strings.ToLower(in) {
	case "account":
		return AdminActionCategoryAccount
	case "domain":
		return AdminActionCategoryDomain
	default:
		return AdminActionCategoryUnknown
	}
}

// AdminActionType describes a type of
// action taken on an entity by an admin.
type AdminActionType uint8

// Only ever add new action types to the *END* of the list
// below, DO NOT insert them before/between other entries!

const (
	AdminActionUnknown AdminActionType = iota
	AdminActionDisable
	AdminActionReenable
	AdminActionSilence
	AdminActionUnsilence
	AdminActionSuspend
	AdminActionUnsuspend
	AdminActionExpireKeys
)

func (t AdminActionType) String() string {
	switch t {
	case AdminActionDisable:
		return "disable"
	case AdminActionReenable:
		return "reenable"
	case AdminActionSilence:
		return "silence"
	case AdminActionUnsilence:
		return "unsilence"
	case AdminActionSuspend:
		return "suspend"
	case AdminActionUnsuspend:
		return "unsuspend"
	case AdminActionExpireKeys:
		return "expire-keys"
	default:
		return "unknown"
	}
}

func ParseAdminActionType(in string) AdminActionType {
	switch strings.ToLower(in) {
	case "disable":
		return AdminActionDisable
	case "reenable":
		return AdminActionReenable
	case "silence":
		return AdminActionSilence
	case "unsilence":
		return AdminActionUnsilence
	case "suspend":
		return AdminActionSuspend
	case "unsuspend":
		return AdminActionUnsuspend
	case "expire-keys":
		return AdminActionExpireKeys
	default:
		return AdminActionUnknown
	}
}

// AdminAction models an action taken by an instance administrator towards an account, domain, etc.
type AdminAction struct {
	ID             string              `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                    // ID of this item in the database.
	CreatedAt      time.Time           `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // Creation time of this item.
	UpdatedAt      time.Time           `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // Last updated time of this item.
	CompletedAt    time.Time           `bun:"type:timestamptz,nullzero"`                                   // Completion time of this item.
	TargetCategory AdminActionCategory `bun:",nullzero,notnull"`                                           // Category of the entity targeted by this action.
	TargetID       string              `bun:",nullzero,notnull"`                                           // Identifier of the target. May be a ULID (in case of accounts), or a domain name (in case of domains).
	Target         interface{}         `bun:"-"`                                                           // Target of the action. Might be a domain string, might be an account.
	Type           AdminActionType     `bun:",nullzero,notnull"`                                           // Type of action that was taken.
	AccountID      string              `bun:"type:CHAR(26),notnull,nullzero"`                              // Who performed this admin action.
	Account        *Account            `bun:"rel:has-one"`                                                 // Account corresponding to accountID
	Text           string              `bun:",nullzero"`                                                   // Free text field for explaining why this action was taken, or adding a note about this action.
	SendEmail      *bool               `bun:",nullzero,notnull,default:false"`                             // Send an email to the target account's user to explain what happened (local accounts only).
	ReportIDs      []string            `bun:"reports,array"`                                               // IDs of any reports cited when creating this action.
	Reports        []*Report           `bun:"-"`                                                           // Reports corresponding to ReportIDs.
	Errors         []string            `bun:",array"`                                                      // String value of any error(s) encountered while processing. May be helpful for admins to debug.
}

// Key returns a key for the AdminAction which is
// unique only on its TargetCategory and TargetID
// fields. This key can be used to check if this
// AdminAction overlaps with another action performed
// on the same target, regardless of the Type of
// either this or the other action.
func (a *AdminAction) Key() string {
	return path.Join(
		a.TargetCategory.String(),
		a.TargetID,
	)
}