import type { AgentStatusIpcPayload } from '../../shared/agent-status-types'
import type { StructuredAgentSessionResumeSource } from '../../shared/structured-agent-session-create'
import type { StructuredAgentId } from '../../shared/agent-session-provider-handle'
import { agentSessionRefusalError } from '../../shared/agent-session-wire-refusals'
import {
  adoptsCliConversations,
  chatAgentsShareConversations,
  CLI_CONVERSATION_ADOPTING_AGENTS
} from '../../shared/structured-agent-cli-conversation-adoption'
import { isWslUncPath } from '../../shared/wsl-paths'
import { needsWslHostResolution } from './host-readable-transcript-path'
import { parseSshTranscriptPath } from './ssh-transcript-path'

export type StructuredAgentCliSourceEvidence =
  | { readonly rows: readonly Readonly<AgentStatusIpcPayload>[] }
  | { readonly error: unknown }

export function captureStructuredAgentCliSource(
  readRows: () => readonly AgentStatusIpcPayload[]
): StructuredAgentCliSourceEvidence {
  try {
    return Object.freeze({
      rows: Object.freeze(
        readRows().map((row) => Object.freeze({
          ...row,
          ...(row.providerSession
            ? { providerSession: Object.freeze({ ...row.providerSession }) }
            : {})
        }))
      )
    })
  } catch (error) {
    // Capture cannot override an existing owner or committed replay.
    return Object.freeze({ error })
  }
}

export function structuredAgentCliSourcePathFromEvidence(input: {
  agent: StructuredAgentId
  resumeFrom: StructuredAgentSessionResumeSource
  workspaceId: string
  evidence?: StructuredAgentCliSourceEvidence
}): string | undefined {
  const evidence = input.evidence
  if (input.resumeFrom.cliSource && evidence && 'error' in evidence) {
    throw evidence.error
  }
  return structuredAgentCliSourcePath({
    ...input,
    rows: evidence && 'rows' in evidence ? evidence.rows : []
  })
}

/** A client names a pane; only this host supplies its provider path. */
export function structuredAgentCliSourcePath(input: {
  agent: StructuredAgentId
  resumeFrom: StructuredAgentSessionResumeSource
  workspaceId: string
  rows: readonly AgentStatusIpcPayload[]
}): string | undefined {
  const source = input.resumeFrom.cliSource
  if (!source) {
    return undefined
  }
  const row = input.rows.find(
    (candidate) =>
      source.workspaceId === input.workspaceId &&
      candidate.worktreeId === source.workspaceId &&
      candidate.paneKey === source.paneKey &&
      !candidate.connectionId &&
      !candidate.structuredHost &&
      adoptsCliConversations(candidate.agentType) &&
      // A 2.x pane started as `opencode` reports `opencode`; the OpenCode 2 chat opens its conversation.
      CLI_CONVERSATION_ADOPTING_AGENTS[candidate.agentType].some((agent) =>
        chatAgentsShareConversations(agent, input.agent)
      ) &&
      candidate.providerSession?.id === input.resumeFrom.providerSessionId
  )
  if (!row) {
    throw agentSessionRefusalError(
      'agent_session_identity_required',
      { reason: 'transcriptUnreadable' },
      'The source conversation is no longer available.'
    )
  }
  const path = row.providerSession?.transcriptPath?.trim()
  if (
    path &&
    (isWslUncPath(path) || needsWslHostResolution(path) || parseSshTranscriptPath(path))
  ) {
    throw agentSessionRefusalError('structured_agent_session_unsupported', {
      reason: 'hostUnsupported'
    })
  }
  return path || undefined
}