import { CustomIconName } from 'components/CustomIcon'
import { AllMachines } from 'hooks/useStateMachineCommands'
import { Actor, AnyStateMachine, ContextFrom, EventFrom } from 'xstate'
import { Selection } from './selections'
import { Identifier, Expr, VariableDeclaration } from 'lang/wasm'
import { commandBarMachine } from 'machines/commandBarMachine'
import { ReactNode } from 'react'

type Icon = CustomIconName
const PLATFORMS = ['both', 'web', 'desktop'] as const
const INPUT_TYPES = [
  'options',
  'string',
  'text',
  'kcl',
  'selection',
  'boolean',
] as const
export interface KclExpression {
  valueAst: Expr
  valueText: string
  valueCalculated: string
}
export interface KclExpressionWithVariable extends KclExpression {
  variableName: string
  variableDeclarationAst: VariableDeclaration
  variableIdentifierAst: Identifier
  insertIndex: number
}
export type KclCommandValue = KclExpression | KclExpressionWithVariable
export type CommandInputType = (typeof INPUT_TYPES)[number]

export type StateMachineCommandSetSchema<T extends AnyStateMachine> = Partial<{
  [EventType in EventFrom<T>['type']]: Record<string, any>
}>

export type StateMachineCommandSet<
  T extends AllMachines,
  Schema extends StateMachineCommandSetSchema<T>
> = Partial<{
  [EventType in EventFrom<T>['type']]: Command<
    T,
    EventFrom<T>['type'],
    Schema[EventType]
  >
}>

/**
 * A configuration object for a set of commands tied to a state machine.
 * Each event type can have one or more commands associated with it.
 * @param T The state machine type.
 * @param Schema The schema for the command set, defined by the developer.
 */
export type StateMachineCommandSetConfig<
  T extends AllMachines,
  Schema extends StateMachineCommandSetSchema<T>
> = Partial<{
  [EventType in EventFrom<T>['type']]:
    | CommandConfig<T, EventFrom<T>['type'], Schema[EventType]>
    | CommandConfig<T, EventFrom<T>['type'], Schema[EventType]>[]
}>

export type Command<
  T extends AnyStateMachine = AnyStateMachine,
  CommandName extends EventFrom<T>['type'] = EventFrom<T>['type'],
  CommandSchema extends StateMachineCommandSetSchema<T>[CommandName] = StateMachineCommandSetSchema<T>[CommandName]
> = {
  name: CommandName
  groupId: T['id']
  needsReview: boolean
  reviewMessage?:
    | string
    | ReactNode
    | ((
        commandBarContext: { argumentsToSubmit: Record<string, unknown> } // Should be the commandbarMachine's context, but it creates a circular dependency
      ) => string | ReactNode)
  onSubmit: (data?: CommandSchema) => void
  onCancel?: () => void
  args?: {
    [ArgName in keyof CommandSchema]: CommandArgument<CommandSchema[ArgName], T>
  }
  displayName?: string
  description?: string
  icon?: Icon
  hide?: (typeof PLATFORMS)[number]
}

export type CommandConfig<
  T extends AnyStateMachine = AnyStateMachine,
  CommandName extends EventFrom<T>['type'] = EventFrom<T>['type'],
  CommandSchema extends StateMachineCommandSetSchema<T>[CommandName] = StateMachineCommandSetSchema<T>[CommandName]
> = Omit<
  Command<T, CommandName, CommandSchema>,
  'name' | 'groupId' | 'onSubmit' | 'onCancel' | 'args' | 'needsReview'
> & {
  needsReview?: true
  args?: {
    [ArgName in keyof CommandSchema]: CommandArgumentConfig<
      CommandSchema[ArgName],
      ContextFrom<T>
    >
  }
}

export type CommandArgumentConfig<
  OutputType,
  C = ContextFrom<AnyStateMachine>
> = {
  description?: string
  required:
    | boolean
    | ((
        commandBarContext: { argumentsToSubmit: Record<string, unknown> }, // Should be the commandbarMachine's context, but it creates a circular dependency
        machineContext?: C
      ) => boolean)
  warningMessage?: string
  skip?: boolean
  /** For showing a summary display of the current value, such as in
   *  the command bar's header
   */
  valueSummary?: (value: OutputType) => string
} & (
  | {
      inputType: 'options'
      options:
        | CommandArgumentOption<OutputType>[]
        | ((
            commandBarContext: {
              argumentsToSubmit: Record<string, unknown>
            }, // Should be the commandbarMachine's context, but it creates a circular dependency
            machineContext?: C
          ) => CommandArgumentOption<OutputType>[])
      optionsFromContext?: (context: C) => CommandArgumentOption<OutputType>[]
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: C
          ) => OutputType)
      defaultValueFromContext?: (context: C) => OutputType
    }
  | {
      inputType: 'selection'
      selectionTypes: Selection['type'][]
      multiple: boolean
    }
  | { inputType: 'kcl'; defaultValue?: string } // KCL expression inputs have simple strings as default values
  | {
      inputType: 'string'
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: C
          ) => OutputType)
      defaultValueFromContext?: (context: C) => OutputType
    }
  | {
      inputType: 'text'
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: C
          ) => OutputType)
      defaultValueFromContext?: (context: C) => OutputType
    }
  | {
      inputType: 'boolean'
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: C
          ) => OutputType)
      defaultValueFromContext?: (context: C) => OutputType
    }
)

export type CommandArgument<
  OutputType,
  T extends AnyStateMachine = AnyStateMachine
> = {
  description?: string
  required:
    | boolean
    | ((
        commandBarContext: { argumentsToSubmit: Record<string, unknown> }, // Should be the commandbarMachine's context, but it creates a circular dependency
        machineContext?: ContextFrom<T>
      ) => boolean)
  skip?: boolean
  machineActor?: Actor<T>
  warningMessage?: string
  /** For showing a summary display of the current value, such as in
   *  the command bar's header
   */
  valueSummary?: (value: OutputType) => string
} & (
  | {
      inputType: Extract<CommandInputType, 'options'>
      options:
        | CommandArgumentOption<OutputType>[]
        | ((
            commandBarContext: {
              argumentsToSubmit: Record<string, unknown>
            }, // Should be the commandbarMachine's context, but it creates a circular dependency
            machineContext?: ContextFrom<T>
          ) => CommandArgumentOption<OutputType>[])
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: ContextFrom<T>
          ) => OutputType)
    }
  | {
      inputType: 'selection'
      selectionTypes: Selection['type'][]
      multiple: boolean
    }
  | { inputType: 'kcl'; defaultValue?: string } // KCL expression inputs have simple strings as default value
  | {
      inputType: 'string'
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: ContextFrom<T>
          ) => OutputType)
    }
  | {
      inputType: 'text'
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: ContextFrom<T>
          ) => OutputType)
    }
  | {
      inputType: 'boolean'
      defaultValue?:
        | OutputType
        | ((
            commandBarContext: ContextFrom<typeof commandBarMachine>,
            machineContext?: ContextFrom<T>
          ) => OutputType)
    }
)

export type CommandArgumentWithName<
  OutputType,
  T extends AnyStateMachine = AnyStateMachine
> = CommandArgument<OutputType, T> & {
  name: string
}

export type CommandArgumentOption<A> = {
  name: string
  isCurrent?: boolean
  value: A
}