import { feature } from 'bun:bundle'
import { getModelOptions } from 'src/utils/model/modelOptions.js'
import { isVoiceGrowthBookEnabled } from 'src/voice/voiceModeEnabled.js'
import {
  getOptionsForSetting,
  SUPPORTED_SETTINGS,
} from './supportedSettings.js'

export const DESCRIPTION = 'Get or set Claude Code configuration settings.'

/**
 * Generate the prompt documentation from the registry
 */
export function generatePrompt(): string {
  const globalSettings: string[] = []
  const projectSettings: string[] = []

  for (const [key, config] of Object.entries(SUPPORTED_SETTINGS)) {
    // Skip model - it gets its own section with dynamic options
    if (key === 'model') continue
    // Voice settings are registered at build-time but gated by GrowthBook
    // at runtime. Hide from model prompt when the kill-switch is on.
    if (
      feature('VOICE_MODE') &&
      key === 'voiceEnabled' &&
      !isVoiceGrowthBookEnabled()
    )
      continue

    const options = getOptionsForSetting(key)
    let line = `- ${key}`

    if (options) {
      line += `: ${options.map(o => `"${o}"`).join(', ')}`
    } else if (config.type === 'boolean') {
      line += `: true/false`
    }

    line += ` - ${config.description}`

    if (config.source === 'global') {
      globalSettings.push(line)
    } else {
      projectSettings.push(line)
    }
  }

  const modelSection = generateModelSection()

  return `Get or set Claude Code configuration settings.

  View or change Claude Code settings. Use when the user requests configuration changes, asks about current settings, or when adjusting a setting would benefit them.


## Usage
- **Get current value:** Omit the "value" parameter
- **Set new value:** Include the "value" parameter

## Configurable settings list
The following settings are available for you to change:

### Global Settings (stored in ~/.claude.json)
${globalSettings.join('\n')}

### Project Settings (stored in settings.json)
${projectSettings.join('\n')}

${modelSection}
## Examples
- Get theme: { "setting": "theme" }
- Set dark theme: { "setting": "theme", "value": "dark" }
- Enable vim mode: { "setting": "editorMode", "value": "vim" }
- Enable verbose: { "setting": "verbose", "value": true }
- Change model: { "setting": "model", "value": "opus" }
- Change permission mode: { "setting": "permissions.defaultMode", "value": "plan" }
`
}

function generateModelSection(): string {
  try {
    const options = getModelOptions()
    const lines = options.map(o => {
      const value = o.value === null ? 'null/"default"' : `"${o.value}"`
      return `  - ${value}: ${o.descriptionForModel ?? o.description}`
    })
    return `## Model
- model - Override the default model. Available options:
${lines.join('\n')}`
  } catch {
    return `## Model
- model - Override the default model (sonnet, opus, haiku, best, or full model ID)`
  }
}
