import type {
  SourceControlActionLaunchPreferences,
  SourceControlActionRecipe
} from './source-control-ai-actions'
import {
  actionArgumentChoicesValue,
  reconcileActionArgumentDocumentTransaction,
  retireActionArgumentModelSelection,
  demoteActionArgumentChoices,
  readActionArgumentNode,
  transportActionArgumentChoices
} from './source-control-action-argument-choices'
import {
  actionModelSelectionChoices,
  readActionModelSelection
} from './source-control-action-model-selection'
import { isTuiAgent } from './tui-agent-config'
import type { TuiAgent } from './tui-agent'

type CurrentActionSource = {
  authoredAgentId: SourceControlActionRecipe['agentId']
  authoredPreferences: SourceControlActionLaunchPreferences | undefined
}

export type CurrentActionSelection = {
  current: Omit<
    SourceControlActionRecipe,
    'launchPreferences' | 'resolvedChoiceSources' | 'launchPreferencesYieldToAgentArgs'
  >
  source: CurrentActionSource &
    (
      | { scope: 'global' }
      | {
          scope: 'repo'
          parentPreferences: SourceControlActionLaunchPreferences | undefined
          ownsArgs: boolean
        }
    )
}

export type SelectedSourceControlActionRecipe = SourceControlActionRecipe & {
  resolvedChoiceSources: NonNullable<SourceControlActionRecipe['resolvedChoiceSources']> & {
    canonicalAgentId: TuiAgent | undefined
  }
}

/** Canonical entries have one authored source and no inferred parent. */
export function canonicalSourceControlActionSelection(
  recipe: SourceControlActionRecipe
): CurrentActionSelection {
  const {
    launchPreferences,
    resolvedChoiceSources: _sources,
    launchPreferencesYieldToAgentArgs: _yield,
    ...current
  } = recipe
  return {
    current,
    source: {
      scope: 'global',
      authoredAgentId: recipe.agentId,
      authoredPreferences: launchPreferences
    }
  }
}

export function selectSourceControlActionRecipe(
  selection: CurrentActionSelection
): SelectedSourceControlActionRecipe {
  const { current, source } = selection
  const own = source.authoredPreferences
  const parent = source.scope === 'repo' ? source.parentPreferences : undefined
  const ownsArgs = source.scope === 'repo' && source.ownsArgs
  const ownModel = readActionModelSelection(own)
  const parentModel = readActionModelSelection(parent)
  const model =
    ownsArgs || ownModel?.base === 'default'
      ? ownModel
      : ownModel
        ? {
            base: 'inherit' as const,
            model: ownModel.model ?? parentModel?.model,
            options: { ...parentModel?.options, ...ownModel.options }
          }
        : parentModel
  const permission =
    source.scope === 'repo'
      ? (own ?? (source.authoredAgentId === undefined ? parent : undefined))
      : own
  const preferences = source.scope === 'global' || ownsArgs ? own : (own ?? parent)
  return {
    ...current,
    ...(preferences ? { launchPreferences: preferences } : {}),
    resolvedChoiceSources: {
      model: source.scope === 'global' ? ownModel : model,
      permission,
      canonicalAgentId: permission?.agentId ?? preferences?.agentId ?? parent?.agentId,
      literalKeys:
        ownsArgs || ownModel?.base !== 'default' || source.scope === 'global'
          ? (current.argumentChoices?.nodes ?? []).flatMap((node) => {
              const key = readActionArgumentNode(
                current.argumentChoices!.syntaxAgent,
                node.text
              )?.key
              return key ? [key] : []
            })
          : []
    }
  }
}

/** Read-only recipe adapters admit canonical data once; mutable invocations retain their inputs. */
export function sourceControlActionRecipeEntry(
  recipe: SourceControlActionRecipe
): SelectedSourceControlActionRecipe {
  return recipe.resolvedChoiceSources
    ? {
        ...recipe,
        resolvedChoiceSources: {
          ...recipe.resolvedChoiceSources,
          canonicalAgentId: recipe.resolvedChoiceSources.canonicalAgentId
        }
      }
    : selectSourceControlActionRecipe(canonicalSourceControlActionSelection(recipe))
}

export function pickSourceControlActionAgent(
  selection: CurrentActionSelection,
  agent: TuiAgent,
  observedAgent: TuiAgent | null,
  surface: SourceControlActionRecipe['surface']
): CurrentActionSelection {
  const actual = isTuiAgent(selection.current.agentId) ? selection.current.agentId : observedAgent
  const same = actual === agent
  const preferences = selection.source.authoredPreferences
  const model = readActionModelSelection(preferences)
  const alreadyBound =
    preferences?.agentId === agent &&
    (!model?.model || model.model.agentId === agent) &&
    Object.values(model?.options ?? {}).every((entry) => entry.agentId === agent)
  const document = selection.current.argumentChoices
  const { surface: _surface, ...current } =
    !same && document && document.syntaxAgent !== agent
      ? demoteActionArgumentChoices(selection.current)
      : selection.current
  return {
    current: { ...current, agentId: agent, ...(surface ? { surface } : {}) },
    source: same
      ? selection.source
      : {
          ...selection.source,
          authoredAgentId: agent,
          authoredPreferences: alreadyBound ? preferences : undefined
        }
  }
}

export function editSourceControlActionArguments(
  selection: CurrentActionSelection,
  agentArgs: string
): CurrentActionSelection {
  return {
    ...selection,
    current: {
      ...selection.current,
      agentArgs,
      argumentChoices: transportActionArgumentChoices(selection.current, agentArgs)
    }
  }
}

/** Finalize an explicit raw edit once, retaining captured sources beside the consumed view. */
export function commitSourceControlActionArguments(
  selection: CurrentActionSelection,
  agent: TuiAgent
): { selection: CurrentActionSelection; recipe: SelectedSourceControlActionRecipe } {
  const selected = selectSourceControlActionRecipe(selection)
  const { model, permission, literalKeys } = selected.resolvedChoiceSources
  const document = selected.argumentChoices
  const literal = actionArgumentChoicesValue({
    argumentChoices:
      document?.syntaxAgent === agent
        ? {
            ...document,
            nodes: document.nodes.filter((node) => {
              const key = readActionArgumentNode(document.syntaxAgent, node.text)!.key
              const entry = key === 'model' ? model?.model : model?.options?.[key]
              return literalKeys.includes(key) && !entry
            })
          }
        : undefined
  })
  const typed = actionModelSelectionChoices(model, agent)
  const current = selection.current
  const transaction = reconcileActionArgumentDocumentTransaction(
    { ...current, agentId: agent },
    'arguments-edit',
    {
      choices: {
        ...literal,
        ...typed,
        options: { ...literal.options, ...typed.options },
        ...(permission?.agentId === agent ? { permissionMode: permission.permissionMode } : {})
      },
      literalKeys,
      permissionEligible: !permission || permission.agentId === agent
    }
  )
  const receipt = transaction.result
  if (!receipt?.selected.length) {
    return { selection, recipe: selected }
  }
  const touched = new Set(receipt.selected.map((entry) => entry.key))
  const source = selection.source
  const own = readActionModelSelection(source.authoredPreferences)
  const ownsKey = (key: string) =>
    source.scope === 'global' ||
    source.ownsArgs ||
    own?.base === 'default' ||
    (key === 'model' ? own?.model : own?.options?.[key]) !== undefined
  const update = (
    preferences: SourceControlActionLaunchPreferences | undefined,
    owns: (key: string) => boolean,
    ownsPermission: boolean
  ) => {
    const previous = readActionModelSelection(preferences)
    const modelSelection = retireActionArgumentModelSelection(
      previous,
      agent,
      touched,
      receipt.choices,
      'arguments-edit',
      owns
    )
    if (modelSelection === previous && !(ownsPermission && touched.has('permissionMode'))) {
      return preferences
    }
    const permissionMode =
      ownsPermission && touched.has('permissionMode')
        ? receipt.choices.permissionMode
        : preferences?.permissionMode
    return modelSelection || permissionMode
      ? {
          agentId: preferences?.agentId ?? agent,
          ...(modelSelection ? { modelSelection } : {}),
          ...(permissionMode ? { permissionMode } : {})
        }
      : undefined
  }
  const ownPermission =
    source.scope === 'global' ||
    source.authoredPreferences !== undefined ||
    source.authoredAgentId !== undefined
  const next: CurrentActionSelection = {
    current: {
      ...current,
      agentArgs: transaction.recipe.agentArgs,
      argumentChoices: transaction.recipe.argumentChoices
    },
    source: {
      ...source,
      authoredPreferences: update(source.authoredPreferences, ownsKey, ownPermission),
      ...(source.scope === 'repo'
        ? {
            parentPreferences: update(
              source.parentPreferences,
              (key) => !ownsKey(key),
              !ownPermission
            )
          }
        : {})
    }
  }
  const committedPermission = touched.has('permissionMode')
    ? {
        agentId: permission?.agentId ?? agent,
        permissionMode: receipt.choices.permissionMode
      }
    : permission
  const nodes = transaction.recipe.argumentChoices
  return {
    selection: next,
    recipe: {
      ...selected,
      agentArgs: transaction.recipe.agentArgs,
      argumentChoices: nodes,
      resolvedChoiceSources: {
        ...selected.resolvedChoiceSources,
        model: retireActionArgumentModelSelection(
          model,
          agent,
          touched,
          receipt.choices,
          'arguments-edit'
        ),
        permission: committedPermission,
        canonicalAgentId: touched.has('permissionMode')
          ? committedPermission?.agentId
          : selected.resolvedChoiceSources.canonicalAgentId,
        literalKeys: (nodes?.nodes ?? []).flatMap((node) => {
          const key = readActionArgumentNode(nodes!.syntaxAgent, node.text)!.key
          return literalKeys.includes(key) || touched.has(key) ? [key] : []
        })
      }
    }
  }
}