import figures from 'figures'
import React, { useMemo, useState } from 'react'
import type { SDKMessage } from 'src/entrypoints/agentSdkTypes.js'
import type { ToolUseContext } from 'src/Tool.js'
import type { DeepImmutable } from 'src/types/utils.js'
import type { CommandResultDisplay } from '../../commands.js'
import { DIAMOND_FILLED, DIAMOND_OPEN } from '../../constants/figures.js'
import { useElapsedTime } from '../../hooks/useElapsedTime.js'
import { type KeyboardEvent, Box, Link, Text } from '@anthropic/ink'
import type { RemoteAgentTaskState } from '../../tasks/RemoteAgentTask/RemoteAgentTask.js'
import { getRemoteTaskSessionUrl } from '../../tasks/RemoteAgentTask/RemoteAgentTask.js'
import {
  AGENT_TOOL_NAME,
  LEGACY_AGENT_TOOL_NAME,
} from '../../tools/AgentTool/constants.js'
import { ASK_USER_QUESTION_TOOL_NAME } from '../../tools/AskUserQuestionTool/prompt.js'
import { EXIT_PLAN_MODE_V2_TOOL_NAME } from '../../tools/ExitPlanModeTool/constants.js'
import { openBrowser } from '../../utils/browser.js'
import { errorMessage } from '../../utils/errors.js'
import { formatDuration, truncateToWidth } from '../../utils/format.js'
import { toInternalMessages } from '../../utils/messages/mappers.js'
import { EMPTY_LOOKUPS, normalizeMessages } from '../../utils/messages.js'
import { plural } from '../../utils/stringUtils.js'
import { teleportResumeCodeSession } from '../../utils/teleport.js'
import { Select } from '../CustomSelect/select.js'
import { Byline, Dialog, KeyboardShortcutHint } from '@anthropic/ink'
import { Message } from '../Message.js'
import {
  formatReviewStageCounts,
  RemoteSessionProgress,
} from './RemoteSessionProgress.js'

type Props = {
  session: DeepImmutable<RemoteAgentTaskState>
  toolUseContext: ToolUseContext
  onDone: (
    result?: string,
    options?: { display?: CommandResultDisplay },
  ) => void
  onBack?: () => void
  onKill?: () => void
}

// Compact one-line summary: tool name + first meaningful string arg.
// Lighter than tool.renderToolUseMessage (no registry lookup / schema parse).
// Collapses whitespace so multi-line inputs (e.g. Bash command text)
// render on one line.
export function formatToolUseSummary(name: string, input: unknown): string {
  // plan_ready phase is only reached via ExitPlanMode tool
  if (name === EXIT_PLAN_MODE_V2_TOOL_NAME) {
    return 'Review the plan in Claude Code on the web'
  }
  if (!input || typeof input !== 'object') return name
  // AskUserQuestion: show the question text as a CTA, not the tool name.
  // Input shape is {questions: [{question, header, options}]}.
  if (name === ASK_USER_QUESTION_TOOL_NAME && 'questions' in input) {
    const qs = input.questions
    if (Array.isArray(qs) && qs[0] && typeof qs[0] === 'object') {
      // Prefer question (full text) over header (max-12-char tag). header
      // is a required schema field so checking it first would make the
      // question fallback dead code.
      const q =
        'question' in qs[0] &&
        typeof qs[0].question === 'string' &&
        qs[0].question
          ? qs[0].question
          : 'header' in qs[0] && typeof qs[0].header === 'string'
            ? qs[0].header
            : null
      if (q) {
        const oneLine = q.replace(/\s+/g, ' ').trim()
        return `Answer in browser: ${truncateToWidth(oneLine, 50)}`
      }
    }
  }
  for (const v of Object.values(input)) {
    if (typeof v === 'string' && v.trim()) {
      const oneLine = v.replace(/\s+/g, ' ').trim()
      return `${name} ${truncateToWidth(oneLine, 60)}`
    }
  }
  return name
}

const PHASE_LABEL = {
  needs_input: 'input required',
  plan_ready: 'ready',
} as const

const AGENT_VERB = {
  needs_input: 'waiting',
  plan_ready: 'done',
} as const

function UltraplanSessionDetail({
  session,
  onDone,
  onBack,
  onKill,
}: Omit<Props, 'toolUseContext'>): React.ReactNode {
  const running = session.status === 'running' || session.status === 'pending'
  const phase = session.ultraplanPhase
  const statusText = running
    ? phase
      ? PHASE_LABEL[phase]
      : 'running'
    : session.status
  const elapsedTime = useElapsedTime(
    session.startTime,
    running,
    1000,
    0,
    session.endTime,
  )

  // Counts are eventually correct (lag ≤ poll interval). agentsWorking starts
  // at 1 (the main session agent) and increments per subagent spawn. toolCalls
  // is main-session only — subagent calls may not surface in this stream.
  const { agentsWorking, toolCalls, lastToolCall } = useMemo(() => {
    let spawns = 0
    let calls = 0
    let lastBlock: { name: string; input: unknown } | null = null
    for (const msg of session.log) {
      if (msg.type !== 'assistant') continue
      const content = msg.message?.content ?? []
      for (const block of content as Array<{type: string; name: string; input: unknown}>) {
        if (block.type !== 'tool_use') continue
        calls++
        lastBlock = block
        if (
          block.name === AGENT_TOOL_NAME ||
          block.name === LEGACY_AGENT_TOOL_NAME
        ) {
          spawns++
        }
      }
    }
    return {
      agentsWorking: 1 + spawns,
      toolCalls: calls,
      lastToolCall: lastBlock
        ? formatToolUseSummary(lastBlock.name, lastBlock.input)
        : null,
    }
  }, [session.log])

  const sessionUrl = getRemoteTaskSessionUrl(session.sessionId)
  const goBackOrClose =
    onBack ??
    (() => onDone('Remote session details dismissed', { display: 'system' }))
  const [confirmingStop, setConfirmingStop] = useState(false)

  if (confirmingStop) {
    return (
      <Dialog
        title="Stop ultraplan?"
        onCancel={() => setConfirmingStop(false)}
        color="background"
      >
        <Box flexDirection="column" gap={1}>
          <Text dimColor>
            This will terminate the Claude Code on the web session.
          </Text>
          <Select
            options={[
              { label: 'Terminate session', value: 'stop' as const },
              { label: 'Back', value: 'back' as const },
            ]}
            onChange={v => {
              if (v === 'stop') {
                onKill?.()
                goBackOrClose()
              } else {
                setConfirmingStop(false)
              }
            }}
          />
        </Box>
      </Dialog>
    )
  }

  return (
    <Dialog
      title={
        <Text>
          <Text color="background">
            {phase === 'plan_ready' ? DIAMOND_FILLED : DIAMOND_OPEN}{' '}
          </Text>
          <Text bold>ultraplan</Text>
          <Text dimColor>
            {' · '}
            {elapsedTime}
            {' · '}
            {statusText}
          </Text>
        </Text>
      }
      onCancel={goBackOrClose}
      color="background"
    >
      <Box flexDirection="column" gap={1}>
        <Text>
          {phase === 'plan_ready' && (
            <Text color="success">{figures.tick} </Text>
          )}
          {agentsWorking} {plural(agentsWorking, 'agent')}{' '}
          {phase ? AGENT_VERB[phase] : 'working'} · {toolCalls} tool{' '}
          {plural(toolCalls, 'call')}
        </Text>
        {lastToolCall && <Text dimColor>{lastToolCall}</Text>}
        <Link url={sessionUrl}>
          <Text dimColor>{sessionUrl}</Text>
        </Link>
        <Select
          options={[
            {
              label: 'Review in Claude Code on the web',
              value: 'open' as const,
            },
            ...(onKill && running
              ? [{ label: 'Stop ultraplan', value: 'stop' as const }]
              : []),
            { label: 'Back', value: 'back' as const },
          ]}
          onChange={v => {
            switch (v) {
              case 'open':
                void openBrowser(sessionUrl)
                // Close the dialog so the user lands back at the prompt with
                // any half-written input intact (inputValue persists across
                // the showBashesDialog toggle).
                onDone()
                return
              case 'stop':
                setConfirmingStop(true)
                return
              case 'back':
                goBackOrClose()
                return
            }
          }}
        />
      </Box>
    </Dialog>
  )
}

const STAGES = ['finding', 'verifying', 'synthesizing'] as const
const STAGE_LABELS: Record<(typeof STAGES)[number], string> = {
  finding: 'Find',
  verifying: 'Verify',
  synthesizing: 'Dedupe',
}

// Setup → Find → Verify → Dedupe pipeline. Current stage in cloud teal,
// rest dim. When completed, all stages dim with a trailing green ✓. The
// "Setup" label shows before the orchestrator writes its first progress
// snapshot (container boot + repo clone), so the 0-found display doesn't
// look like a hung finder.
function StagePipeline({
  stage,
  completed,
  hasProgress,
}: {
  stage: 'finding' | 'verifying' | 'synthesizing' | undefined
  completed: boolean
  hasProgress: boolean
}): React.ReactNode {
  const currentIdx = stage ? STAGES.indexOf(stage) : -1
  const inSetup = !completed && !hasProgress
  return (
    <Text>
      {inSetup ? (
        <Text color="background">Setup</Text>
      ) : (
        <Text dimColor>Setup</Text>
      )}
      <Text dimColor> → </Text>
      {STAGES.map((s, i) => {
        const isCurrent = !completed && !inSetup && i === currentIdx
        return (
          <React.Fragment key={s}>
            {i > 0 && <Text dimColor> → </Text>}
            {isCurrent ? (
              <Text color="background">{STAGE_LABELS[s]}</Text>
            ) : (
              <Text dimColor>{STAGE_LABELS[s]}</Text>
            )}
          </React.Fragment>
        )
      })}
      {completed && <Text color="success"> ✓</Text>}
    </Text>
  )
}

// Stage-appropriate counts line. Running-state formatting delegates to
// formatReviewStageCounts (shared with the pill) so the two views can't
// drift; completed state is dialog-specific (findings summary).
function reviewCountsLine(
  session: DeepImmutable<RemoteAgentTaskState>,
): string {
  const p = session.reviewProgress
  // No progress data — the orchestrator never wrote a snapshot. Don't
  // claim "0 findings" when completed; we just don't know.
  if (!p) return session.status === 'completed' ? 'done' : 'setting up'
  const verified = p.bugsVerified
  const refuted = p.bugsRefuted ?? 0
  if (session.status === 'completed') {
    const parts = [`${verified} ${plural(verified, 'finding')}`]
    if (refuted > 0) parts.push(`${refuted} refuted`)
    return parts.join(' · ')
  }
  return formatReviewStageCounts(p.stage, p.bugsFound, verified, refuted)
}

type MenuAction = 'open' | 'stop' | 'back' | 'dismiss'

function ReviewSessionDetail({
  session,
  onDone,
  onBack,
  onKill,
}: Omit<Props, 'toolUseContext'>): React.ReactNode {
  const completed = session.status === 'completed'
  const running = session.status === 'running' || session.status === 'pending'
  const [confirmingStop, setConfirmingStop] = useState(false)

  // useElapsedTime drives the 1Hz tick so the timer advances while the
  // dialog is open — the previous inline elapsed-time calculation only
  // re-rendered on session state changes (poll interval), which looked
  // like the clock was stuck.
  const elapsedTime = useElapsedTime(
    session.startTime,
    running,
    1000,
    0,
    session.endTime,
  )

  const handleClose = () =>
    onDone('Remote session details dismissed', { display: 'system' })
  const goBackOrClose = onBack ?? handleClose

  const sessionUrl = getRemoteTaskSessionUrl(session.sessionId)
  const statusLabel = completed ? 'ready' : running ? 'running' : session.status

  if (confirmingStop) {
    return (
      <Dialog
        title="Stop ultrareview?"
        onCancel={() => setConfirmingStop(false)}
        color="background"
      >
        <Box flexDirection="column" gap={1}>
          <Text dimColor>
            This archives the remote session and stops local tracking. The
            review will not complete and any findings so far are discarded.
          </Text>
          <Select
            options={[
              { label: 'Stop ultrareview', value: 'stop' as const },
              { label: 'Back', value: 'back' as const },
            ]}
            onChange={v => {
              if (v === 'stop') {
                onKill?.()
                goBackOrClose()
              } else {
                setConfirmingStop(false)
              }
            }}
          />
        </Box>
      </Dialog>
    )
  }

  const options: { label: string; value: MenuAction }[] = completed
    ? [
        { label: 'Open in Claude Code on the web', value: 'open' },
        { label: 'Dismiss', value: 'dismiss' },
      ]
    : [
        { label: 'Open in Claude Code on the web', value: 'open' },
        ...(onKill && running
          ? [{ label: 'Stop ultrareview', value: 'stop' as const }]
          : []),
        { label: 'Back', value: 'back' },
      ]

  const handleSelect = (action: MenuAction) => {
    switch (action) {
      case 'open':
        void openBrowser(sessionUrl)
        onDone()
        break
      case 'stop':
        setConfirmingStop(true)
        break
      case 'back':
        goBackOrClose()
        break
      case 'dismiss':
        handleClose()
        break
    }
  }

  return (
    <Dialog
      title={
        <Text>
          <Text color="background">
            {completed ? DIAMOND_FILLED : DIAMOND_OPEN}{' '}
          </Text>
          <Text bold>ultrareview</Text>
          <Text dimColor>
            {' · '}
            {elapsedTime}
            {' · '}
            {statusLabel}
          </Text>
        </Text>
      }
      onCancel={goBackOrClose}
      color="background"
      inputGuide={exitState =>
        exitState.pending ? (
          <Text>Press {exitState.keyName} again to exit</Text>
        ) : (
          <Byline>
            <KeyboardShortcutHint shortcut="Enter" action="select" />
            <KeyboardShortcutHint shortcut="Esc" action="go back" />
          </Byline>
        )
      }
    >
      <Box flexDirection="column" gap={1}>
        <StagePipeline
          stage={session.reviewProgress?.stage}
          completed={completed}
          hasProgress={!!session.reviewProgress}
        />

        <Box flexDirection="column">
          <Text>{reviewCountsLine(session)}</Text>
          <Link url={sessionUrl}>
            <Text dimColor>{sessionUrl}</Text>
          </Link>
        </Box>

        <Select options={options} onChange={handleSelect} />
      </Box>
    </Dialog>
  )
}

export function RemoteSessionDetailDialog({
  session,
  toolUseContext,
  onDone,
  onBack,
  onKill,
}: Props): React.ReactNode {
  const [isTeleporting, setIsTeleporting] = useState(false)
  const [teleportError, setTeleportError] = useState<string | null>(null)

  // Get last few messages from remote session for display.
  // Scan all messages (not just the last 3 raw entries) because the tail of
  // the log is often thinking-only blocks that normalise to 'progress' type.
  // Placed before the early returns so hook call order is stable (Rules of Hooks).
  // Ultraplan/review sessions never read this — skip the normalize work for them.
  const lastMessages = useMemo(() => {
    if (session.isUltraplan || session.isRemoteReview) return []
    return normalizeMessages(toInternalMessages(session.log as SDKMessage[]))
      .filter(_ => _.type !== 'progress')
      .slice(-3)
  }, [session])

  if (session.isUltraplan) {
    return (
      <UltraplanSessionDetail
        session={session}
        onDone={onDone}
        onBack={onBack}
        onKill={onKill}
      />
    )
  }

  // Review sessions get the stage-pipeline view; everything else keeps the
  // generic label/value + recent-messages dialog below.
  if (session.isRemoteReview) {
    return (
      <ReviewSessionDetail
        session={session}
        onDone={onDone}
        onBack={onBack}
        onKill={onKill}
      />
    )
  }

  const handleClose = () =>
    onDone('Remote session details dismissed', { display: 'system' })

  // Component-specific shortcuts shown in UI hints (t=teleport, space=dismiss,
  // left=back). These are state-dependent actions, not standard dialog keybindings.
  const handleKeyDown = (e: KeyboardEvent) => {
    if (e.key === ' ') {
      e.preventDefault()
      onDone('Remote session details dismissed', { display: 'system' })
    } else if (e.key === 'left' && onBack) {
      e.preventDefault()
      onBack()
    } else if (e.key === 't' && !isTeleporting) {
      e.preventDefault()
      void handleTeleport()
    } else if (e.key === 'return') {
      e.preventDefault()
      handleClose()
    }
  }

  // Handle teleporting to remote session
  async function handleTeleport(): Promise<void> {
    setIsTeleporting(true)
    setTeleportError(null)

    try {
      await teleportResumeCodeSession(session.sessionId)
    } catch (err) {
      setTeleportError(errorMessage(err))
    } finally {
      setIsTeleporting(false)
    }
  }

  // Truncate title if too long (for display purposes)
  const displayTitle = truncateToWidth(session.title, 50)

  // Map TaskStatus to display status (handle 'pending')
  const displayStatus =
    session.status === 'pending' ? 'starting' : session.status

  return (
    <Box
      flexDirection="column"
      tabIndex={0}
      autoFocus
      onKeyDown={handleKeyDown}
    >
      <Dialog
        title="Remote session details"
        onCancel={handleClose}
        color="background"
        inputGuide={exitState =>
          exitState.pending ? (
            <Text>Press {exitState.keyName} again to exit</Text>
          ) : (
            <Byline>
              {onBack && <KeyboardShortcutHint shortcut="←" action="go back" />}
              <KeyboardShortcutHint shortcut="Esc/Enter/Space" action="close" />
              {!isTeleporting && (
                <KeyboardShortcutHint shortcut="t" action="teleport" />
              )}
            </Byline>
          )
        }
      >
        <Box flexDirection="column">
          <Text>
            <Text bold>Status</Text>:{' '}
            {displayStatus === 'running' || displayStatus === 'starting' ? (
              <Text color="background">{displayStatus}</Text>
            ) : displayStatus === 'completed' ? (
              <Text color="success">{displayStatus}</Text>
            ) : (
              <Text color="error">{displayStatus}</Text>
            )}
          </Text>
          <Text>
            <Text bold>Runtime</Text>:{' '}
            {formatDuration(
              (session.endTime ?? Date.now()) - session.startTime,
            )}
          </Text>
          <Text wrap="truncate-end">
            <Text bold>Title</Text>: {displayTitle}
          </Text>
          <Text>
            <Text bold>Progress</Text>:{' '}
            <RemoteSessionProgress session={session} />
          </Text>
          <Text>
            <Text bold>Session URL</Text>:{' '}
            <Link url={getRemoteTaskSessionUrl(session.sessionId)}>
              <Text dimColor>{getRemoteTaskSessionUrl(session.sessionId)}</Text>
            </Link>
          </Text>
        </Box>

        {/* Remote session messages section */}
        {session.log.length > 0 && (
          <Box flexDirection="column" marginTop={1}>
            <Text>
              <Text bold>Recent messages</Text>:
            </Text>
            <Box flexDirection="column" height={10} overflowY="hidden">
              {lastMessages.map((msg, i) => (
                <Message
                  key={i}
                  message={msg}
                  lookups={EMPTY_LOOKUPS}
                  addMargin={i > 0}
                  tools={toolUseContext.options.tools}
                  commands={toolUseContext.options.commands}
                  verbose={toolUseContext.options.verbose}
                  inProgressToolUseIDs={new Set()}
                  progressMessagesForMessage={[]}
                  shouldAnimate={false}
                  shouldShowDot={false}
                  style="condensed"
                  isTranscriptMode={false}
                  isStatic={true}
                />
              ))}
            </Box>
            <Box marginTop={1}>
              <Text dimColor italic>
                Showing last {lastMessages.length} of {session.log.length}{' '}
                messages
              </Text>
            </Box>
          </Box>
        )}

        {/* Teleport error message */}
        {teleportError && (
          <Box marginTop={1}>
            <Text color="error">Teleport failed: {teleportError}</Text>
          </Box>
        )}

        {/* Teleporting status */}
        {isTeleporting && (
          <Text color="background">Teleporting to session…</Text>
        )}
      </Dialog>
    </Box>
  )
}