import { isCustomAgentId } from './commit-message-agent-spec'
import type { CommitMessageAiSettings } from './commit-message-ai-types'
import {
  DEFAULT_SOURCE_CONTROL_ACTION_COMMAND_TEMPLATES,
  AI_ACTION_IDS,
  SOURCE_CONTROL_TEXT_ACTION_IDS,
  normalizeSourceControlAiActionDefaults,
  readSourceControlActionDefault
} from './source-control-ai-actions'
import {
  actionRecipeFromLegacyCommitMessageAi,
  commandTemplateFromOperationInstruction,
  isLegacyBranchInstructionTemplate
} from './source-control-ai-command-template'
import type {
  SourceControlAiPrCreationDefaults,
  SourceControlAiSettings
} from './source-control-ai-types'

export const DEFAULT_SOURCE_CONTROL_AI_PR_CREATION_DEFAULTS: Required<SourceControlAiPrCreationDefaults> =
  {
    draft: false,
    useTemplate: false,
    generateDetailsOnOpen: false,
    openAfterCreate: false
  }

function copyRecord<T>(value: T | undefined): T | undefined {
  return value === undefined ? undefined : structuredClone(value)
}

export function getDefaultSourceControlAiSettings(): SourceControlAiSettings {
  const actions: NonNullable<SourceControlAiSettings['actions']> = {}
  for (const actionId of AI_ACTION_IDS) {
    actions[actionId] = {
      commandInputTemplate: DEFAULT_SOURCE_CONTROL_ACTION_COMMAND_TEMPLATES[actionId]
    }
  }
  return {
    enabled: true,
    actions,
    agentId: null,
    selectedModelByAgent: {},
    selectedModelByAgentByHost: {},
    discoveredModelsByAgent: {},
    discoveredModelsByAgentByHost: {},
    selectedThinkingByModel: {},
    customAgentCommand: '',
    instructionsByOperation: { commitMessage: '', pullRequest: '', branchName: '' },
    prCreationDefaults: { ...DEFAULT_SOURCE_CONTROL_AI_PR_CREATION_DEFAULTS },
    launchActionDefaults: {}
  }
}

export function sourceControlAiSettingsFromLegacy(
  legacy: CommitMessageAiSettings | null | undefined
): SourceControlAiSettings {
  const defaults = getDefaultSourceControlAiSettings()
  if (!legacy) {
    return defaults
  }
  const legacyActionRecipe = actionRecipeFromLegacyCommitMessageAi(legacy)
  return {
    ...defaults,
    enabled: legacy.enabled,
    agentId: legacy.agentId,
    selectedModelByAgent: { ...legacy.selectedModelByAgent },
    selectedModelByAgentByHost: copyRecord(legacy.selectedModelByAgentByHost) ?? {},
    discoveredModelsByAgent: copyRecord(legacy.discoveredModelsByAgent) ?? {},
    discoveredModelsByAgentByHost: copyRecord(legacy.discoveredModelsByAgentByHost) ?? {},
    selectedThinkingByModel: { ...legacy.selectedThinkingByModel },
    customAgentCommand: legacy.customAgentCommand,
    instructionsByOperation: {
      commitMessage: legacy.customPrompt ?? '',
      pullRequest: '',
      branchName: legacy.customPrompt ?? ''
    },
    actions: {
      ...defaults.actions,
      commitMessage: legacyActionRecipe,
      branchName: {
        ...legacyActionRecipe,
        commandInputTemplate: commandTemplateFromOperationInstruction(
          'branchName',
          legacy.customPrompt
        )
      }
    }
  }
}

export function normalizeSourceControlAiSettings(
  value: SourceControlAiSettings | null | undefined,
  legacy?: CommitMessageAiSettings | null
): SourceControlAiSettings {
  const base = value ?? sourceControlAiSettingsFromLegacy(legacy)
  const defaults = getDefaultSourceControlAiSettings()
  const normalizedLaunchActionDefaults = normalizeSourceControlAiActionDefaults(
    base.launchActionDefaults
  )
  const normalizedActions = {
    ...normalizedLaunchActionDefaults,
    ...normalizeSourceControlAiActionDefaults(base.actions)
  }
  const migratedTextActions = Object.fromEntries(
    SOURCE_CONTROL_TEXT_ACTION_IDS.map((actionId) => {
      const existing = readSourceControlActionDefault(normalizedActions, actionId)
      const instruction = base.instructionsByOperation?.[actionId]
      const legacyInstruction = actionId === 'commitMessage' ? legacy?.customPrompt : undefined
      const resolvedInstruction = instruction ?? legacyInstruction
      const instructionTemplate =
        instruction || legacyInstruction
          ? commandTemplateFromOperationInstruction(actionId, resolvedInstruction)
          : undefined
      const shouldApplyInstructionTemplate =
        instructionTemplate !== undefined &&
        (existing.commandInputTemplate === undefined ||
          existing.commandInputTemplate ===
            DEFAULT_SOURCE_CONTROL_ACTION_COMMAND_TEMPLATES[actionId] ||
          isLegacyBranchInstructionTemplate(
            actionId,
            resolvedInstruction,
            existing.commandInputTemplate
          ))
      return [
        actionId,
        {
          ...defaults.actions?.[actionId],
          ...(base.agentId && !isCustomAgentId(base.agentId) ? { agentId: base.agentId } : {}),
          ...existing,
          ...(shouldApplyInstructionTemplate ? { commandInputTemplate: instructionTemplate } : {})
        }
      ]
    })
  ) as SourceControlAiSettings['actions']
  return {
    ...defaults,
    ...base,
    selectedModelByAgent: { ...defaults.selectedModelByAgent, ...base.selectedModelByAgent },
    selectedModelByAgentByHost:
      copyRecord(base.selectedModelByAgentByHost) ?? defaults.selectedModelByAgentByHost,
    discoveredModelsByAgent:
      copyRecord(base.discoveredModelsByAgent) ?? defaults.discoveredModelsByAgent,
    discoveredModelsByAgentByHost:
      copyRecord(base.discoveredModelsByAgentByHost) ?? defaults.discoveredModelsByAgentByHost,
    selectedThinkingByModel: {
      ...defaults.selectedThinkingByModel,
      ...base.selectedThinkingByModel
    },
    instructionsByOperation: {
      ...defaults.instructionsByOperation,
      ...base.instructionsByOperation
    },
    modelOverridesByOperation: copyRecord(base.modelOverridesByOperation),
    prCreationDefaults: { ...defaults.prCreationDefaults, ...base.prCreationDefaults },
    actions: { ...defaults.actions, ...normalizedActions, ...migratedTextActions },
    launchActionDefaults: normalizedLaunchActionDefaults ?? defaults.launchActionDefaults
  }
}