package service

import (
	"fmt"
	"strings"

	"browser.local/platform/domain"
	"browser.local/platform/validator"
)

func (svc *CoreService) ListRemoteAdapterDeclarationsForSession(sessionID string, serverInstanceID string) ([]domain.RemoteAdapterDeclaration, error) {
	instance, err := svc.GetServerInstanceForSession(sessionID, serverInstanceID)
	if err != nil {
		return nil, err
	}
	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)
	if err != nil {
		return nil, err
	}
	endpoint, err := svc.store.RunEndpoints().Get(instance.RunEndpointID)
	if err != nil {
		return nil, err
	}
	if !plugin.Permissions.RemoteAccess {
		return []domain.RemoteAdapterDeclaration{}, nil
	}
	declarations := make([]domain.RemoteAdapterDeclaration, 0, len(plugin.RuntimeProfiles.TransportProfiles))
	for _, profile := range plugin.RuntimeProfiles.TransportProfiles {
		capabilities := intersectRemoteCapabilities(profile.Capabilities, plugin.RemoteAccess.RunCapabilities, endpoint.Capabilities)
		if len(capabilities) == 0 || strings.TrimSpace(profile.TargetKey) == "" {
			continue
		}
		declaration := domain.RemoteAdapterDeclaration{Key: profile.Key, Kind: remoteAdapterKind(profile.Kind), TargetKeys: []string{profile.TargetKey}, Capabilities: capabilities, TimeoutSeconds: 30, MaxAttempts: 3}
		if err := validator.ValidateRemoteAdapterDeclaration(declaration); err != nil {
			return nil, err
		}
		declarations = append(declarations, declaration)
	}
	return domain.CopyRemoteAdapterDeclarations(declarations), nil
}

func (svc *CoreService) RequestRemoteAdapterForSession(sessionID string, request domain.RemoteAdapterRequest) (domain.RemoteAdapterResult, error) {
	request = domain.CopyRemoteAdapterRequest(request)
	if err := validator.ValidateRemoteAdapterRequest(request); err != nil {
		return domain.RemoteAdapterResult{}, err
	}
	instance, err := svc.GetServerInstanceForSession(sessionID, request.ServerInstanceID)
	if err != nil {
		return domain.RemoteAdapterResult{}, err
	}
	declarations, err := svc.ListRemoteAdapterDeclarationsForSession(sessionID, instance.ID)
	if err != nil {
		return domain.RemoteAdapterResult{}, err
	}
	var selected domain.RemoteAdapterDeclaration
	for _, declaration := range declarations {
		if declaration.Key == request.DeclarationKey && containsString(declaration.TargetKeys, request.TargetKey) && containsString(declaration.Capabilities, request.Capability) {
			selected = declaration
			break
		}
	}
	if selected.Key == "" {
		plugin, pluginErr := svc.store.GamePlugins().Get(instance.PluginID)
		endpoint, endpointErr := svc.store.RunEndpoints().Get(instance.RunEndpointID)
		if pluginErr == nil && endpointErr == nil && plugin.Permissions.RemoteAccess && containsString(plugin.RemoteAccess.RunCapabilities, request.Capability) && containsString(endpoint.Capabilities, request.Capability) {
			selected = domain.RemoteAdapterDeclaration{Key: "legacy-" + string(remoteAdapterKindForCapability(request.Capability)), Kind: remoteAdapterKindForCapability(request.Capability), TargetKeys: []string{request.TargetKey}, Capabilities: []string{request.Capability}, TimeoutSeconds: 30, MaxAttempts: 3}
		}
		if selected.Key == "" {
			user, _ := svc.GetCurrentUser(sessionID)
			_ = svc.recordAuditEvent(user.ID, "remote-adapter.authorize", "server-instance", instance.ID, domain.AuditResultDenied, "remote adapter declaration, target, or capability was not approved")
			return domain.RemoteAdapterResult{}, ErrForbidden
		}
	}
	timeout := request.TimeoutSeconds
	if timeout == 0 {
		timeout = selected.TimeoutSeconds
	}
	attempts := request.MaxAttempts
	if attempts == 0 {
		attempts = selected.MaxAttempts
	}
	if timeout > selected.TimeoutSeconds || attempts > selected.MaxAttempts {
		return domain.RemoteAdapterResult{}, validationError("remote adapter timeout or retry exceeds declaration")
	}
	inputRef := request.InputRef
	if inputRef == "" {
		inputRef = fmt.Sprintf("input://remote-adapters/%s/%s", instance.ID, request.DeclarationKey)
	}
	job := domain.Job{
		ID:               jobIDFromParts("job-remote-adapter", instance.ID, request.IdempotencyKey),
		ServerInstanceID: instance.ID,
		RunEndpointID:    instance.RunEndpointID,
		Capability:       request.Capability,
		TargetKey:        request.TargetKey,
		InputRef:         inputRef,
		IdempotencyKey:   request.IdempotencyKey,
		Progress:         domain.JobProgress{Percent: 0, Message: "scoped remote adapter queued"},
		RetryPolicy:      domain.JobRetryPolicy{MaxAttempts: attempts, InitialBackoffSeconds: 2, MaxBackoffSeconds: 30},
		ExecutionInput:   domain.JobExecutionInput{WorkspaceScope: svc.runtimeProfileScope(instance.ID), RemoteAdapterKey: selected.Key, RemoteAdapterKind: string(selected.Kind), TimeoutSeconds: timeout, Inputs: domain.CopyStringMap(request.Inputs)},
	}
	created, err := svc.CreateJob(job)
	if err != nil {
		return domain.RemoteAdapterResult{}, err
	}
	user, err := svc.GetCurrentUser(sessionID)
	if err != nil {
		return domain.RemoteAdapterResult{}, err
	}
	auditID, err := svc.recordAuditEventWithID(user.ID, "remote-adapter.authorize", "server-instance", instance.ID, domain.AuditResultQueued, "authorized declared remote adapter target with bounded timeout and retry")
	if err != nil {
		return domain.RemoteAdapterResult{}, err
	}
	return domain.RemoteAdapterResult{RequestID: created.ID, ServerInstanceID: instance.ID, DeclarationKey: selected.Key, TargetKey: request.TargetKey, Kind: selected.Kind, Status: string(created.State), Retryable: attempts > 1, Message: "scoped remote adapter queued", ResultRef: "job://" + created.ID, AuditEventID: auditID}, nil
}

func intersectRemoteCapabilities(profile []string, declared []string, endpoint []string) []string {
	result := make([]string, 0, len(profile))
	for _, capability := range profile {
		if isRemoteAdapterCapability(capability) && containsString(declared, capability) && containsString(endpoint, capability) {
			result = append(result, capability)
		}
	}
	return result
}

func isRemoteAdapterCapability(capability string) bool {
	switch capability {
	case domain.JobCapabilityRemoteFTPRead, domain.JobCapabilityRemoteFTPWrite,
		domain.JobCapabilityRemoteRsyncRead, domain.JobCapabilityRemoteRsyncWrite,
		domain.JobCapabilityRemoteRunFilesRead, domain.JobCapabilityRemoteRunFilesWrite,
		domain.JobCapabilityRemoteRunProcessStart, domain.JobCapabilityRemoteRunProcessStop,
		domain.JobCapabilityRemoteRunDBMySQLQuery, domain.JobCapabilityRemoteRunDBSQLiteQuery,
		domain.JobCapabilityRemoteRunLogsTransfer, domain.JobCapabilityRemoteRunRCONCommand:
		return true
	default:
		return false
	}
}

func remoteAdapterKind(kind string) domain.RemoteAdapterKind {
	switch strings.ToLower(strings.TrimSpace(kind)) {
	case "ftp":
		return domain.RemoteAdapterFTP
	case "rsync":
		return domain.RemoteAdapterRsync
	case "file":
		return domain.RemoteAdapterRunFile
	case "process":
		return domain.RemoteAdapterRunProcess
	case "sqlite", "mysql", "database":
		return domain.RemoteAdapterDatabase
	case "rcon":
		return domain.RemoteAdapterRCON
	default:
		return domain.RemoteAdapterKind(strings.ToLower(strings.TrimSpace(kind)))
	}
}

func remoteAdapterKindForCapability(capability string) domain.RemoteAdapterKind {
	switch capability {
	case domain.JobCapabilityRemoteFTPRead, domain.JobCapabilityRemoteFTPWrite:
		return domain.RemoteAdapterFTP
	case domain.JobCapabilityRemoteRsyncRead, domain.JobCapabilityRemoteRsyncWrite:
		return domain.RemoteAdapterRsync
	case domain.JobCapabilityRemoteRunFilesRead, domain.JobCapabilityRemoteRunFilesWrite:
		return domain.RemoteAdapterRunFile
	case domain.JobCapabilityRemoteRunProcessStart, domain.JobCapabilityRemoteRunProcessStop:
		return domain.RemoteAdapterRunProcess
	case domain.JobCapabilityRemoteRunDBMySQLQuery, domain.JobCapabilityRemoteRunDBSQLiteQuery:
		return domain.RemoteAdapterDatabase
	case domain.JobCapabilityRemoteRunRCONCommand:
		return domain.RemoteAdapterRCON
	case domain.JobCapabilityRemoteRunLogsTransfer:
		return domain.RemoteAdapterKind("log-transfer")
	default:
		return ""
	}
}