import type { ContentBlockParam } from '@anthropic-ai/sdk/resources/index.mjs'
import type { UUID } from 'crypto'
import type { CanUseToolFn } from '../hooks/useCanUseTool.js'
import type { CompactionResult } from '../services/compact/compact.js'
import type { ScopedMcpServerConfig } from '../services/mcp/types.js'
import type { ToolUseContext } from '../Tool.js'
import type { AgentDefinition } from '../tools/AgentTool/loadAgentsDir.js'
import type { EffortValue } from '../utils/effort.js'
import type { IDEExtensionInstallationStatus, IdeType } from '../utils/ide.js'
import type { SettingSource } from '../utils/settings/constants.js'
import type { HooksSettings } from '../utils/settings/types.js'
import type { ThemeName } from '../utils/theme.js'
import type { LogOption } from './logs.js'
import type { Message } from './message.js'
import type { PluginManifest } from './plugin.js'
import type { LocalizationKey } from '../i18n/types.js'

export type LocalCommandResult =
  | {
      type: 'text'
      value: string
      display?: 'skip'
      shouldQuery?: boolean
      metaMessages?: string[]
      nextInput?: string
      submitNextInput?: boolean
    }
  | {
      type: 'compact'
      compactionResult: CompactionResult
      displayText?: string
      nextInput?: string
      submitNextInput?: boolean
    }
  | {
      type: 'skip'
      nextInput?: string
      submitNextInput?: boolean
    } // Skip messages

export type PromptCommand = {
  type: 'prompt'
  progressMessage: string
  contentLength: number // Length of command content in characters (used for token estimation)
  argNames?: string[]
  allowedTools?: string[]
  model?: string
  source: SettingSource | 'builtin' | 'mcp' | 'plugin' | 'bundled'
  pluginInfo?: {
    pluginManifest: PluginManifest
    repository: string
  }
  disableNonInteractive?: boolean
  // Hooks to register when this skill is invoked
  hooks?: HooksSettings
  // Base directory for skill resources (used to set CLAUDE_PLUGIN_ROOT environment variable for skill hooks)
  skillRoot?: string
  // Execution context: 'inline' (default) or 'fork' (run as sub-agent)
  // 'inline' = skill content expands into the current conversation
  // 'fork' = skill runs in a sub-agent with separate context and token budget
  context?: 'inline' | 'fork'
  // Agent type to use when forked (e.g., 'Bash', 'general-purpose')
  // Only applicable when context is 'fork'
  agent?: string
  effort?: EffortValue
  // Glob patterns for file paths this skill applies to
  // When set, the skill is only visible after the model touches matching files
  paths?: string[]
  getPromptForCommand(
    args: string,
    context: ToolUseContext,
  ): Promise<ContentBlockParam[]>
}

/**
 * The call signature for a local command implementation.
 */
export type LocalCommandCall = (
  args: string,
  context: LocalJSXCommandContext,
) => Promise<LocalCommandResult>

/**
 * Module shape returned by load() for lazy-loaded local commands.
 */
export type LocalCommandModule = {
  call: LocalCommandCall
}

type LocalCommand = {
  type: 'local'
  supportsNonInteractive: boolean
  load: () => Promise<LocalCommandModule>
}

export type LocalJSXCommandContext = ToolUseContext & {
  canUseTool?: CanUseToolFn
  setMessages: (updater: (prev: Message[]) => Message[]) => void
  options: {
    dynamicMcpConfig?: Record<string, ScopedMcpServerConfig>
    ideInstallationStatus: IDEExtensionInstallationStatus | null
    theme: ThemeName
  }
  onChangeAPIKey: () => void
  onChangeDynamicMcpConfig?: (
    config: Record<string, ScopedMcpServerConfig>,
  ) => void
  onInstallIDEExtension?: (ide: IdeType) => void
  setActiveSessionAgent?: (agent: AgentDefinition) => void
  resume?: (
    sessionId: UUID,
    log: LogOption,
    entrypoint: ResumeEntrypoint,
  ) => Promise<void>
}

export type ResumeEntrypoint =
  | 'cli_flag'
  | 'slash_command_picker'
  | 'slash_command_session_id'
  | 'slash_command_title'
  | 'fork'

export type CommandResultDisplay = 'skip' | 'system' | 'user'

/**
 * Callback when a command completes.
 * @param result - Optional user-visible message to display
 * @param options - Optional configuration for command completion
 * @param options.display - How to display the result: 'skip' | 'system' | 'user' (default)
 * @param options.shouldQuery - If true, send messages to the model after command completes
 * @param options.metaMessages - Additional messages to insert as isMeta (model-visible but hidden)
 */
export type LocalJSXCommandOnDone = (
  result?: string,
  options?: {
    display?: CommandResultDisplay
    shouldQuery?: boolean
    metaMessages?: string[]
    nextInput?: string
    submitNextInput?: boolean
  },
) => void

/**
 * The call signature for a local JSX command implementation.
 */
export type LocalJSXCommandCall = (
  onDone: LocalJSXCommandOnDone,
  context: ToolUseContext & LocalJSXCommandContext,
  args: string,
) => Promise<React.ReactNode>

/**
 * Module shape returned by load() for lazy-loaded commands.
 */
export type LocalJSXCommandModule = {
  call: LocalJSXCommandCall
}

type LocalJSXCommand = {
  type: 'local-jsx'
  /**
   * Lazy-load the command implementation.
   * Returns a module with a call() function.
   * This defers loading heavy dependencies until the command is invoked.
   */
  load: () => Promise<LocalJSXCommandModule>
}

/**
 * Declares which auth/provider environments a command is available in.
 *
 * This is separate from `isEnabled()`:
 *   - `availability` = who can use this (auth/provider requirement, static)
 *   - `isEnabled()`  = is this turned on right now (GrowthBook, platform, env vars)
 *
 * Commands without `availability` are available everywhere.
 * Commands with `availability` are only shown if the user matches at least one
 * of the listed auth types. See meetsAvailabilityRequirement() in commands.ts.
 *
 * Example: `availability: ['claude-ai', 'console']` shows the command to
 * claude.ai subscribers and direct Console API key users (api.anthropic.com),
 * but hides it from Bedrock/Vertex/Foundry users and custom base URL users.
 */
export type CommandAvailability =
  // claude.ai OAuth subscriber (Pro/Max/Team/Enterprise via claude.ai)
  | 'claude-ai'
  // Console API key user (direct api.anthropic.com, not via claude.ai OAuth)
  | 'console'

export type CommandBase = {
  availability?: CommandAvailability[]
  description: string
  localizationKey?: LocalizationKey
  hasUserSpecifiedDescription?: boolean
  /** Defaults to true. Only set when the command has conditional enablement (feature flags, env checks, etc). */
  isEnabled?: () => boolean
  /** Defaults to false. Only set when the command should be hidden from typeahead/help. */
  isHidden?: boolean
  name: string
  aliases?: string[]
  isMcp?: boolean
  argumentHint?: string // Hint text for command arguments (displayed in gray after command)
  whenToUse?: string // From the "Skill" spec. Detailed usage scenarios for when to use this command
  whenToUseLocalizationKey?: LocalizationKey
  version?: string // Version of the command/skill
  disableModelInvocation?: boolean // Whether to disable this command from being invoked by models
  userInvocable?: boolean // Whether users can invoke this skill by typing /skill-name
  loadedFrom?:
    | 'commands_DEPRECATED'
    | 'skills'
    | 'plugin'
    | 'managed'
    | 'bundled'
    | 'mcp' // Where the command was loaded from
  kind?: 'workflow' // Distinguishes workflow-backed commands (badged in autocomplete)
  immediate?: boolean // If true, command executes immediately without waiting for a stop point (bypasses queue)
  isSensitive?: boolean // If true, args are redacted from the conversation history
  /** Defaults to `name`. Only override when the displayed name differs (e.g. plugin prefix stripping). */
  userFacingName?: () => string
}

export type Command = CommandBase &
  (PromptCommand | LocalCommand | LocalJSXCommand)

/** Runtime guard for values that are allowed into command registries. */
export function isCommand(value: unknown): value is Command {
  if (typeof value !== 'object' || value === null) return false

  const maybeCommand = value as {
    name?: unknown
    type?: unknown
  }

  return (
    typeof maybeCommand.name === 'string' &&
    (maybeCommand.type === 'prompt' ||
      maybeCommand.type === 'local' ||
      maybeCommand.type === 'local-jsx')
  )
}

/** Resolves the user-visible name, falling back to `cmd.name` when not overridden. */
export function getCommandName(cmd: CommandBase): string {
  return cmd.userFacingName?.() ?? cmd.name
}

/** Resolves whether the command is enabled, defaulting to true. */
export function isCommandEnabled(cmd: CommandBase | null | undefined): boolean {
  return cmd?.isEnabled?.() ?? true
}
