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/*---------------------------------------------------------------------------------------------
chatServiceImpl.ts
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import { DeferredPromise, raceCancellationError, raceTimeout } from '../../../../../base/common/async.js';
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import { CancellationToken, CancellationTokenSource } from '../../../../../base/common/cancellation.js';
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import { IStringDictionary } from '../../../../../base/common/collections.js';
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import { toErrorMessage } from '../../../../../base/common/errorMessage.js';
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import { BugIndicatingError, ErrorNoTelemetry } from '../../../../../base/common/errors.js';
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import { Emitter, Event } from '../../../../../base/common/event.js';
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import { MarkdownString } from '../../../../../base/common/htmlContent.js';
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import { Iterable } from '../../../../../base/common/iterator.js';
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import { Disposable, DisposableResourceMap, DisposableStore, IDisposable, MutableDisposable } from '../../../../../base/common/lifecycle.js';
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import { ResourceMap } from '../../../../../base/common/map.js';
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import { revive } from '../../../../../base/common/marshalling.js';
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import { equals } from '../../../../../base/common/objects.js';
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import { autorun, derived, IObservable, ISettableObservable, observableValue } from '../../../../../base/common/observable.js';
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import { isEqual } from '../../../../../base/common/resources.js';
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import { StopWatch } from '../../../../../base/common/stopwatch.js';
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import { isDefined } from '../../../../../base/common/types.js';
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import { URI } from '../../../../../base/common/uri.js';
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import { generateUuid } from '../../../../../base/common/uuid.js';
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import { OffsetRange } from '../../../../../editor/common/core/ranges/offsetRange.js';
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import { localize } from '../../../../../nls.js';
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import { IConfigurationService } from '../../../../../platform/configuration/common/configuration.js';
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import { IInstantiationService } from '../../../../../platform/instantiation/common/instantiation.js';
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import { ILogService } from '../../../../../platform/log/common/log.js';
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import { Progress } from '../../../../../platform/progress/common/progress.js';
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import { IStorageService, StorageScope, StorageTarget } from '../../../../../platform/storage/common/storage.js';
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import { ITelemetryService } from '../../../../../platform/telemetry/common/telemetry.js';
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import { IWorkspaceContextService } from '../../../../../platform/workspace/common/workspace.js';
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import { IExtensionService } from '../../../../services/extensions/common/extensions.js';
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import { IChatEntitlementService } from '../../../../services/chat/common/chatEntitlementService.js';
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import { IChatDebugService } from '../chatDebugService.js';
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import { IMcpService } from '../../../mcp/common/mcpTypes.js';
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import { awaitStatsForSession } from '../chat.js';
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import { ChatPerfMark, clearChatMarks, markChat } from '../chatPerf.js';
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import { IChatAgentAttachmentCapabilities, IChatAgentCommand, IChatAgentData, IChatAgentHistoryEntry, IChatAgentRequest, IChatAgentResult, IChatAgentService } from '../participants/chatAgents.js';
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import { chatEditingSessionIsReady } from '../editing/chatEditingService.js';
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import { ChatModel, ChatRequestModel, ChatRequestRemovalReason, IChatModel, IChatPendingRequest, IChatRequestModel, IChatRequestModeInfo, IChatRequestVariableData, IChatResponseModel, IExportableChatData, ISerializableChatData, ISerializableChatDataIn, ISerializableChatsData, ISerializedChatDataReference, normalizeSerializableChatData, toChatHistoryContent, updateRanges, ISerializableChatModelInputState, logChangesToStateModel } from '../model/chatModel.js';
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import { ChatModelStore, IStartSessionProps } from '../model/chatModelStore.js';
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import { chatAgentLeader, ChatRequestAgentPart, ChatRequestAgentSubcommandPart, ChatRequestSlashCommandPart, ChatRequestTextPart, chatSubcommandLeader, getPromptText, IParsedChatRequest } from '../requestParser/chatParserTypes.js';
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import { ChatRequestParser } from '../requestParser/chatRequestParser.js';
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import { ChatMcpServersStarting, ChatPendingRequestChangeClassification, ChatPendingRequestChangeEvent, ChatPendingRequestChangeEventName, ChatRequestQueueKind, ChatSendResult, ChatSendResultQueued, ChatSendResultSent, ChatStopCancellationNoopClassification, ChatStopCancellationNoopEvent, ChatStopCancellationNoopEventName, IChatCompleteResponse, IChatDetail, IChatFollowup, IChatModelReference, IChatProgress, IChatQuestionAnswers, IChatSendRequestOptions, IChatSendRequestResponseState, IChatService, IChatSessionStartOptions, IChatUserActionEvent, IRemotePendingRequest, ResponseModelState } from './chatService.js';
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import { ChatRequestTelemetry, ChatServiceTelemetry } from './chatServiceTelemetry.js';
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import { IChatSessionsService, isAgentHostTarget, isTerminalCommandPrompt, localChatSessionType } from '../chatSessionsService.js';
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import { ChatSessionStore, IChatSessionEntryMetadata } from '../model/chatSessionStore.js';
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import { IChatSlashCommandService } from '../participants/chatSlashCommands.js';
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import { IChatTransferService } from '../model/chatTransferService.js';
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import { chatSessionResourceToId, getChatSessionType, isUntitledChatSession, LocalChatSessionUri } from '../model/chatUri.js';
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import { ChatRequestVariableSet, IChatRequestVariableEntry, isExplicitFileOrImageVariableEntry, isPromptTextVariableEntry } from '../attachments/chatVariableEntries.js';
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import { IDynamicVariable } from '../attachments/chatVariables.js';
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import { ChatAgentLocation, ChatConfiguration, ChatModeKind } from '../constants.js';
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import { ChatMessageRole, IChatMessage, ILanguageModelsService } from '../languageModels.js';
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import { ILanguageModelToolsService, ToolAndToolSetEnablementMap } from '../tools/languageModelToolsService.js';
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import { ChatSessionOperationLog } from '../model/chatSessionOperationLog.js';
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import { IPromptsService } from '../promptSyntax/service/promptsService.js';
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import { AGENT_DEBUG_LOG_FILE_LOGGING_ENABLED_SETTING, TROUBLESHOOT_COMMAND_NAME, TROUBLESHOOT_SKILL_PATH, COPILOT_SKILL_URI_SCHEME } from '../promptSyntax/promptTypes.js';
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import { ChatRequestHooks, mergeHooks } from '../promptSyntax/hookSchema.js';
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import { ComputeAutomaticInstructions } from '../promptSyntax/computeAutomaticInstructions.js';
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import { findLast } from '../../../../../base/common/arraysFind.js';
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import { ChatMode } from '../chatModes.js';
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const serializedChatKey = 'interactive.sessions';
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/**
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* True when the user has typed text or attached non-trivial context to the input
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* but not yet sent it. Used to decide whether an external session needs metadata
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* persisted on dispose so the draft survives switching sessions.
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*/
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function hasDraftInput(model: ChatModel): boolean {
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const state = model.inputModel.state.get();