import type { CommandTemplate } from '@shared/ipc'
import { isTemplateLike } from './core/validation'
import { createJsonStore } from './jsonStore'
import { TEMPLATES_MAX } from './constants'

// Plain JSON in userData, same shape as history.ts. Atomic writes / corruption
// backup / caching come from the shared jsonStore (R1–R3).
// A persisted template entry must at least be an object carrying an id (see
// isTemplateLike in validation.ts); everything else is coerced by sanitize().
// Drop anything that isn't, so a hand-edited templates.json can't inject
// malformed entries. (audit S5)
const store = createJsonStore('templates.json', isTemplateLike, TEMPLATES_MAX)

export function listTemplates(): CommandTemplate[] {
  // Normalise each surviving entry through sanitize() so name/args are always
  // well-formed strings regardless of what was on disk.
  return store.read().map(sanitize)
}

function sanitize(t: CommandTemplate): CommandTemplate {
  const urlPattern = typeof t.urlPattern === 'string' ? t.urlPattern.trim() : ''
  return {
    id: String(t.id),
    name: (t.name ?? '').trim() || 'Untitled command',
    args: (t.args ?? '').trim(),
    // Only persist a urlPattern when one was provided, keeping older files clean.
    ...(urlPattern ? { urlPattern } : {})
  }
}

/** Add a new template, or update an existing one (matched by id). */
export function saveTemplate(template: CommandTemplate): CommandTemplate[] {
  const clean = sanitize(template)
  return store.write([clean, ...listTemplates().filter((t) => t.id !== clean.id)])
}

export function removeTemplate(id: string): CommandTemplate[] {
  return store.write(listTemplates().filter((t) => t.id !== id))
}

/** Replace the entire template list (backup restore) rather than merge-by-id. */
export function replaceTemplates(templates: CommandTemplate[]): CommandTemplate[] {
  return store.write(templates.map(sanitize))
}