import { beforeEach, describe, expect, it, vi } from 'vitest'

const listConversationSummariesFromDbMock = vi.fn()
const getConversationDetailFromDbMock = vi.fn()
const listConversationSummariesMock = vi.fn()
const getConversationDetailMock = vi.fn()
const getSessionDetailFromDbMock = vi.fn()
const getExactSessionDetailFromDbWithProfileMock = vi.fn()
const getUsageStatsFromDbMock = vi.fn()
const getSessionMock = vi.fn()
const deleteHermesSessionForProfileMock = vi.fn()
const localListSessionsMock = vi.fn()
const localGetSessionDetailMock = vi.fn()
const localSearchSessionsMock = vi.fn()
const localDeleteSessionMock = vi.fn()
const localRenameSessionMock = vi.fn()
const localCreateSessionMock = vi.fn()
const localUpdateSessionMock = vi.fn()
const getGroupChatServerMock = vi.fn()
const getLocalUsageStatsMock = vi.fn()
const getActiveProfileNameMock = vi.fn()
const loggerWarnMock = vi.fn()
const getCompressionSnapshotMock = vi.fn()

vi.mock('../../packages/server/src/db/hermes/conversations-db', () => ({
  listConversationSummariesFromDb: listConversationSummariesFromDbMock,
  getConversationDetailFromDb: getConversationDetailFromDbMock,
}))

vi.mock('../../packages/server/src/services/hermes/conversations', () => ({
  listConversationSummaries: listConversationSummariesMock,
  getConversationDetail: getConversationDetailMock,
}))

vi.mock('../../packages/server/src/services/logger', () => ({
  logger: {
    warn: loggerWarnMock,
    error: vi.fn(),
  },
}))

vi.mock('../../packages/server/src/services/hermes/hermes-cli', () => ({
  listSessions: vi.fn(),
  getSession: getSessionMock,
  deleteSession: vi.fn(),
  deleteSessionForProfile: deleteHermesSessionForProfileMock,
  renameSession: vi.fn(),
}))

vi.mock('../../packages/server/src/db/hermes/sessions-db', () => ({
  listSessionSummaries: vi.fn(),
  searchSessionSummaries: vi.fn(),
  getSessionDetailFromDb: getSessionDetailFromDbMock,
  getExactSessionDetailFromDbWithProfile: getExactSessionDetailFromDbWithProfileMock,
  getUsageStatsFromDb: getUsageStatsFromDbMock,
}))

vi.mock('../../packages/server/src/db/hermes/session-store', () => ({
  listSessions: localListSessionsMock,
  searchSessions: localSearchSessionsMock,
  getSessionDetail: localGetSessionDetailMock,
  deleteSession: localDeleteSessionMock,
  renameSession: localRenameSessionMock,
  createSession: localCreateSessionMock,
  getSession: getSessionMock,
  updateSession: localUpdateSessionMock,
}))

vi.mock('../../packages/server/src/db/hermes/usage-store', () => ({
  deleteUsage: vi.fn(),
  getUsage: vi.fn(),
  getUsageBatch: vi.fn(),
  getLocalUsageStats: getLocalUsageStatsMock,
}))

vi.mock('../../packages/server/src/routes/hermes/group-chat', () => ({
  getGroupChatServer: getGroupChatServerMock,
}))

vi.mock('../../packages/server/src/services/hermes/model-context', () => ({
  getModelContextLength: vi.fn(),
}))

vi.mock('../../packages/server/src/services/hermes/hermes-profile', () => ({
  getActiveProfileName: getActiveProfileNameMock,
  listProfileNamesFromDisk: () => ['default', 'travel'],
}))

vi.mock('../../packages/server/src/db/hermes/compression-snapshot', () => ({
  getCompressionSnapshot: getCompressionSnapshotMock,
}))

vi.mock('../../packages/server/src/lib/context-compressor/export-compressor', () => ({
  ExportCompressor: class {
    async compress(messages: any[]) {
      return {
        messages,
        meta: { totalMessages: messages.length, compressed: true, llmCompressed: true, summaryTokenEstimate: 100, verbatimCount: 0, compressedStartIndex: -1 },
      }
    }
  },
}))

describe('session conversations controller', () => {
  beforeEach(() => {
    vi.resetModules()
    listConversationSummariesFromDbMock.mockReset()
    getConversationDetailFromDbMock.mockReset()
    listConversationSummariesMock.mockReset()
    getConversationDetailMock.mockReset()
    getSessionDetailFromDbMock.mockReset()
    getExactSessionDetailFromDbWithProfileMock.mockReset()
    getUsageStatsFromDbMock.mockReset()
    getSessionMock.mockReset()
    deleteHermesSessionForProfileMock.mockReset()
    localListSessionsMock.mockReset()
    localGetSessionDetailMock.mockReset()
    localSearchSessionsMock.mockReset()
    localDeleteSessionMock.mockReset()
    localRenameSessionMock.mockReset()
    localCreateSessionMock.mockReset()
    localUpdateSessionMock.mockReset()
    getGroupChatServerMock.mockReset()
    getGroupChatServerMock.mockReturnValue(null)
    getLocalUsageStatsMock.mockReset()
    getActiveProfileNameMock.mockReset()
    getActiveProfileNameMock.mockReturnValue('default')
    loggerWarnMock.mockReset()
    getCompressionSnapshotMock.mockReset()
  })

  it('lists conversations from the local session store', async () => {
    localListSessionsMock.mockReturnValue([{
      id: 'local-conversation',
      source: 'cli',
      model: 'gpt-5',
      title: 'Local',
      started_at: 1,
      ended_at: null,
      last_active: Math.floor(Date.now() / 1000),
      message_count: 2,
      tool_call_count: 0,
      input_tokens: 1,
      output_tokens: 2,
      cache_read_tokens: 0,
      cache_write_tokens: 0,
      reasoning_tokens: 0,
      billing_provider: null,
      estimated_cost_usd: 0,
      actual_cost_usd: null,
      cost_status: '',
      preview: 'preview',
      workspace: null,
    }])

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { query: { humanOnly: 'true', limit: '5' }, body: null }
    await mod.listConversations(ctx)

    expect(localListSessionsMock).toHaveBeenCalledWith('default', undefined, 5)
    expect(listConversationSummariesMock).not.toHaveBeenCalled()
    expect(ctx.body.sessions[0]).toMatchObject({ id: 'local-conversation', source: 'cli', title: 'Local' })
  })

  it('propagates local session store errors for conversation summaries', async () => {
    localListSessionsMock.mockImplementation(() => {
      throw new Error('db unavailable')
    })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { query: { humanOnly: 'false' }, body: null }
    await expect(mod.listConversations(ctx)).rejects.toThrow('db unavailable')
  })

  it('gets conversation messages from the local session store', async () => {
    localGetSessionDetailMock.mockReturnValue({
      id: 'root',
      messages: [
        { id: 1, session_id: 'root', role: 'user', content: 'hello', timestamp: 1 },
        { id: 2, session_id: 'root', role: 'command', content: '/usage', timestamp: 2 },
      ],
    })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { params: { id: 'root' }, query: { humanOnly: 'true' }, body: null }
    await mod.getConversationMessages(ctx)

    expect(localGetSessionDetailMock).toHaveBeenCalledWith('root')
    expect(getConversationDetailMock).not.toHaveBeenCalled()
    expect(ctx.body).toEqual({
      session_id: 'root',
      messages: [{ id: 1, session_id: 'root', role: 'user', content: 'hello', timestamp: 1 }],
      visible_count: 1,
      thread_session_count: 1,
    })
  })

  it('returns 404 when local conversation detail is missing', async () => {
    localGetSessionDetailMock.mockReturnValue(null)

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { params: { id: 'root' }, query: { humanOnly: 'false' }, body: null }
    await mod.getConversationMessages(ctx)

    expect(ctx.status).toBe(404)
    expect(ctx.body).toEqual({ error: 'Conversation not found' })
  })

  it('prefers local session detail for Hermes history detail when available', async () => {
    localGetSessionDetailMock.mockReturnValue({
      id: 'cli-1',
      source: 'cli',
      title: 'Local complete',
      messages: [
        { id: 1, session_id: 'cli-1', role: 'user', content: 'local full message', timestamp: 1 },
      ],
    })
    getSessionDetailFromDbMock.mockResolvedValue({
      id: 'cli-1',
      source: 'cli',
      title: 'Hermes incomplete',
      messages: [],
    })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { params: { id: 'cli-1' }, body: null }
    await mod.getHermesSession(ctx)

    expect(localGetSessionDetailMock).toHaveBeenCalledWith('cli-1')
    expect(getSessionDetailFromDbMock).not.toHaveBeenCalled()
    expect(getSessionMock).not.toHaveBeenCalled()
    expect(ctx.body.session).toMatchObject({
      id: 'cli-1',
      title: 'Local complete',
      messages: [{ content: 'local full message' }],
    })
  })

  it('falls back to Hermes state.db when local history detail is missing', async () => {
    localGetSessionDetailMock.mockReturnValue(null)
    getSessionDetailFromDbMock.mockResolvedValue({
      id: 'hermes-1',
      source: 'cli',
      title: 'Hermes detail',
      messages: [
        { id: 1, session_id: 'hermes-1', role: 'user', content: 'from hermes', timestamp: 1 },
      ],
    })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { params: { id: 'hermes-1' }, body: null }
    await mod.getHermesSession(ctx)

    expect(localGetSessionDetailMock).toHaveBeenCalledWith('hermes-1')
    expect(getSessionDetailFromDbMock).toHaveBeenCalledWith('hermes-1')
    expect(getSessionMock).not.toHaveBeenCalled()
    expect(ctx.body.session).toMatchObject({
      id: 'hermes-1',
      title: 'Hermes detail',
      messages: [{ content: 'from hermes' }],
    })
  })

  it('does not return api_server sessions from the Hermes history detail endpoint', async () => {
    localGetSessionDetailMock.mockReturnValue({
      id: 'api-1',
      source: 'api_server',
      title: 'API Server',
      messages: [{ id: 1, session_id: 'api-1', role: 'user', content: 'local api', timestamp: 1 }],
    })
    getSessionDetailFromDbMock.mockResolvedValue(null)
    getSessionMock.mockResolvedValue(null)

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { params: { id: 'api-1' }, body: null }
    await mod.getHermesSession(ctx)

    expect(localGetSessionDetailMock).toHaveBeenCalledWith('api-1')
    expect(getSessionDetailFromDbMock).toHaveBeenCalledWith('api-1')
    expect(ctx.status).toBe(404)
    expect(ctx.body).toEqual({ error: 'Session not found' })
  })

  it('returns native state.db usage analytics for the requested period', async () => {
    const today = new Date().toISOString().slice(0, 10)
    getLocalUsageStatsMock.mockReturnValue({
      input_tokens: 10,
      output_tokens: 5,
      cache_read_tokens: 2,
      cache_write_tokens: 1,
      reasoning_tokens: 3,
      sessions: 1,
      by_model: [
        { model: 'local-model', input_tokens: 10, output_tokens: 5, cache_read_tokens: 2, cache_write_tokens: 1, reasoning_tokens: 3, sessions: 1 },
      ],
      by_day: [
        { date: today, input_tokens: 10, output_tokens: 5, cache_read_tokens: 2, cache_write_tokens: 1, sessions: 1, errors: 0, cost: 0 },
      ],
    })
    getUsageStatsFromDbMock.mockResolvedValue({
      input_tokens: 20,
      output_tokens: 10,
      cache_read_tokens: 4,
      cache_write_tokens: 2,
      reasoning_tokens: 6,
      sessions: 2,
      cost: 0.02,
      total_api_calls: 7,
      by_model: [
        { model: 'hermes-model', input_tokens: 20, output_tokens: 10, cache_read_tokens: 4, cache_write_tokens: 2, reasoning_tokens: 6, sessions: 2 },
      ],
      by_day: [
        { date: today, input_tokens: 20, output_tokens: 10, cache_read_tokens: 4, cache_write_tokens: 2, sessions: 2, errors: 0, cost: 0.02 },
      ],
    })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { query: { days: '2' }, body: null }
    await mod.usageStats(ctx)

    expect(getLocalUsageStatsMock).not.toHaveBeenCalled()
    expect(getUsageStatsFromDbMock).toHaveBeenCalledWith(2)
    expect(ctx.body).toMatchObject({
      total_input_tokens: 20,
      total_output_tokens: 10,
      total_cache_read_tokens: 4,
      total_cache_write_tokens: 2,
      total_reasoning_tokens: 6,
      total_sessions: 2,
      total_cost: 0.02,
      total_api_calls: 7,
      period_days: 2,
    })
    expect(ctx.body.model_usage).toEqual([
      { model: 'hermes-model', input_tokens: 20, output_tokens: 10, cache_read_tokens: 4, cache_write_tokens: 2, reasoning_tokens: 6, sessions: 2 },
    ])
    expect(ctx.body.daily_usage.find((row: any) => row.date === today)).toMatchObject({
      input_tokens: 20,
      output_tokens: 10,
      cache_read_tokens: 4,
      cache_write_tokens: 2,
      sessions: 2,
      cost: 0.02,
    })
  })

  it('keeps blank model usage as returned by state.db analytics', async () => {
    getLocalUsageStatsMock.mockReturnValue({
      input_tokens: 3,
      output_tokens: 1,
      cache_read_tokens: 2,
      cache_write_tokens: 0,
      reasoning_tokens: 0,
      sessions: 1,
      by_model: [
        { model: '', input_tokens: 3, output_tokens: 1, cache_read_tokens: 2, cache_write_tokens: 0, reasoning_tokens: 0, sessions: 1 },
      ],
      by_day: [],
    })
    getUsageStatsFromDbMock.mockResolvedValue({
      input_tokens: 2,
      output_tokens: 1,
      cache_read_tokens: 1,
      cache_write_tokens: 1,
      reasoning_tokens: 0,
      sessions: 1,
      cost: 0,
      total_api_calls: 0,
      by_model: [
        { model: ' ', input_tokens: 2, output_tokens: 1, cache_read_tokens: 1, cache_write_tokens: 1, reasoning_tokens: 0, sessions: 1 },
      ],
      by_day: [],
    })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { query: { days: '2' }, body: null }
    await mod.usageStats(ctx)

    expect(ctx.body.model_usage).toEqual([
      { model: ' ', input_tokens: 2, output_tokens: 1, cache_read_tokens: 1, cache_write_tokens: 1, reasoning_tokens: 0, sessions: 1 },
    ])
  })

  it('sets a session model and provider in the local session store', async () => {
    getSessionMock.mockReturnValue({ id: 'session-1' })

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = {
      params: { id: 'session-1' },
      request: { body: { model: 'grok-4', provider: 'xai' } },
      body: null,
    }
    await mod.setModel(ctx)

    expect(localCreateSessionMock).not.toHaveBeenCalled()
    expect(localUpdateSessionMock).toHaveBeenCalledWith('session-1', { model: 'grok-4', provider: 'xai' })
    expect(ctx.body).toEqual({ ok: true })
  })

  it('deletes a current-profile Hermes history session even when no local Web UI session exists', async () => {
    getActiveProfileNameMock.mockReturnValue('travel')
    getSessionMock.mockReturnValue(null)
    getExactSessionDetailFromDbWithProfileMock.mockResolvedValue({ id: 'history-only', messages: [] })
    deleteHermesSessionForProfileMock.mockResolvedValue(true)

    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
    const ctx: any = { params: { id: 'history-only' }, body: null }
    await mod.remove(ctx)

    expect(getExactSessionDetailFromDbWithProfileMock).toHaveBeenCalledWith('history-only', 'travel')
    expect(deleteHermesSessionForProfileMock).toHaveBeenCalledWith('history-only', 'travel')
    expect(localDeleteSessionMock).not.toHaveBeenCalled()
    expect(ctx.body).toEqual({
      ok: true,
      deleted: false,
      hermes: { attempted: true, deleted: true, profile: 'travel', error: undefined },
    })
  })

  describe('exportSession', () => {
    it('returns session as JSON download with correct headers (full mode)', async () => {
      const sessionData = { id: 'abc-123', title: 'Test Session', messages: [{ id: 1, role: 'user', content: 'hello' }] }
      localGetSessionDetailMock.mockReturnValue(sessionData)

      const mod = await import('../../packages/server/src/controllers/hermes/sessions')
      const setMock = vi.fn()
      const ctx: any = { params: { id: 'abc-123' }, query: {}, set: setMock, body: null }

      await mod.exportSession(ctx)

      expect(localGetSessionDetailMock).toHaveBeenCalledWith('abc-123')
      expect(setMock).toHaveBeenCalledWith('Content-Disposition', expect.stringContaining('abc-123'))
      expect(setMock).toHaveBeenCalledWith('Content-Type', 'application/json')
      expect(ctx.status).toBeUndefined()
      expect(JSON.parse(ctx.body)).toMatchObject({ id: 'abc-123', title: 'Test Session' })
    })

    it('returns full TXT export', async () => {
      const sessionData = {
        id: 'txt-123',
        title: 'Text Export',
        messages: [
          { id: 1, role: 'user', content: 'hello', timestamp: 1700000000 },
          { id: 2, role: 'assistant', content: 'hi', timestamp: 1700000001 },
        ],
      }
      localGetSessionDetailMock.mockReturnValue(sessionData)

      const mod = await import('../../packages/server/src/controllers/hermes/sessions')
      const setMock = vi.fn()
      const ctx: any = { params: { id: 'txt-123' }, query: { mode: 'full', ext: 'txt' }, set: setMock, body: null }

      await mod.exportSession(ctx)

      expect(setMock).toHaveBeenCalledWith('Content-Type', 'text/plain; charset=utf-8')
      expect(ctx.body).toContain('# Text Export')
      expect(ctx.body).toContain('[user]')
      expect(ctx.body).toContain('hello')
      expect(ctx.body).toContain('[assistant]')
      expect(ctx.body).toContain('hi')
    })

    it('returns 404 when session not found', async () => {
      localGetSessionDetailMock.mockReturnValue(null)
      getSessionMock.mockResolvedValue(null)

      const mod = await import('../../packages/server/src/controllers/hermes/sessions')
      const ctx: any = { params: { id: 'not-found' }, query: {}, set: vi.fn(), body: null }

      await mod.exportSession(ctx)

      expect(ctx.status).toBe(404)
      expect(ctx.body).toEqual({ error: 'Session not found' })
    })

    it('falls back to CLI when DB query fails', async () => {
      const sessionData = { id: 'cli-123', title: 'CLI Session', messages: [] }
      localGetSessionDetailMock.mockReturnValue(sessionData)

      const mod = await import('../../packages/server/src/controllers/hermes/sessions')
      const setMock = vi.fn()
      const ctx: any = { params: { id: 'cli-123' }, query: {}, set: setMock, body: null }

      await mod.exportSession(ctx)

      expect(localGetSessionDetailMock).toHaveBeenCalledWith('cli-123')
      expect(JSON.parse(ctx.body)).toMatchObject({ id: 'cli-123' })
    })
  })
})