import type { SessionSummary as V2SessionSummary } from '@moonshot-ai/agent-core-v2';
import type { GoalChange, GoalSnapshot } from '@moonshot-ai/agent-core-v2/features/goal/types';
import type { PlanData } from '@moonshot-ai/agent-core-v2/features/plan/plan';
import type { ModelCapability, ProviderConfig } from '@moonshot-ai/kosong';
import type { CompactionResult } from '@moonshot-ai/agent-core-v2/agent/fullCompaction/types';
import type { UsageStatus } from '@moonshot-ai/agent-core-v2/agent/usage/usage';

import type { AgentContextData, ContextMessage } from '#/context';
import type { PermissionApprovalResultRecord, PermissionData, PermissionMode } from '#/permission';
import type { BackgroundTaskInfo } from '#/task';
import type { ToolInfo } from '#/tool';

export type AgentType = 'main' | 'sub' | 'independent';

export interface AgentConfigData {
  cwd: string;
  provider?: ProviderConfig;
  modelAlias?: string;
  modelCapabilities: ModelCapability;
  profileName?: string;
  subagentNames?: readonly string[];
  thinkingEffort: string;
  systemPrompt: string;
}

export type AgentConfigUpdateData = Partial<{
  cwd: string;
  modelAlias: string;
  profileName: string;
  subagentNames: readonly string[];
  thinkingEffort: string;
  systemPrompt: string;
}>;

export interface AgentMeta {
  readonly homedir?: string;
  readonly type: AgentType;
  readonly parentAgentId?: string | null;
  readonly swarmItem?: string;
}

export interface SessionMeta {
  createdAt: string;
  updatedAt: string;
  title: string;
  isCustomTitle: boolean;
  lastPrompt?: string;
  forkedFrom?: string;
  workDir?: string;
  additionalDirs?: string[];
  agents: Record<string, AgentMeta>;
  custom: Record<string, any>;
}

export type AgentReplayRecordPayload =
  | { type: 'message'; message: ContextMessage }
  | { type: 'compaction'; result?: CompactionResult | 'cancelled'; instruction?: string }
  | {
      type: 'goal_updated';
      snapshot: GoalSnapshot;
      change: GoalChange | { readonly kind: 'created' };
    }
  | { type: 'plan_updated'; enabled: boolean }
  | { type: 'config_updated'; config: AgentConfigUpdateData }
  | { type: 'permission_updated'; mode: PermissionMode }
  | { type: 'approval_result'; record: PermissionApprovalResultRecord };

export type AgentReplayRecord = { readonly time: number } & AgentReplayRecordPayload;

export interface ResumedAgentState {
  readonly type: AgentType;
  readonly config: AgentConfigData;
  readonly context: AgentContextData;
  readonly replay: readonly AgentReplayRecord[];
  readonly permission: PermissionData;
  readonly plan: PlanData;
  readonly swarmMode?: boolean | undefined;
  readonly usage: UsageStatus;
  readonly tools: readonly ToolInfo[];
  readonly toolStore?: Readonly<Record<string, unknown>>;
  readonly background: readonly BackgroundTaskInfo[];
}

export interface ResumeSessionResult extends V2SessionSummary {
  readonly sessionMetadata: SessionMeta;
  readonly agents: Readonly<Record<string, ResumedAgentState>>;
  readonly warning?: string | undefined;
}

export function limitAgentReplayByTurns(
  records: readonly AgentReplayRecord[],
  maxTurns?: number,
): readonly AgentReplayRecord[] {
  if (maxTurns === undefined) return records;
  if (maxTurns <= 0) return [];
  const turnStarts = records.flatMap((record, index) =>
    isAgentReplayUserTurnRecord(record) ? [index] : [],
  );
  if (turnStarts.length <= maxTurns) return records;
  return records.slice(turnStarts[turnStarts.length - maxTurns]);
}

function isAgentReplayUserTurnRecord(record: AgentReplayRecord): boolean {
  if (record.type !== 'message') return false;
  const { message } = record;
  if (message.role !== 'user') return false;
  switch (message.origin?.kind) {
    case undefined:
    case 'user':
      return true;
    case 'skill_activation':
      return message.origin.trigger === 'user-slash';
    case 'plugin_command':
      return message.origin.trigger === 'user-slash';
    case 'shell_command':
      return message.origin.phase === 'input';
    case 'cron_job':
    case 'cron_missed':
      return true;
    case 'background_task':
    case 'compaction_summary':
    case 'hook_result':
    case 'injection':
    case 'retry':
      return false;
    case 'system_trigger':
      return message.origin.name === 'goal_continuation';
  }
}