/**
 * Prompt templates for the two claude entry points (brainstorm and
 * implement-plan). Defaults live in `src/settings/store.ts` (alongside the
 * other tunables); these helpers just read the persisted setting and run
 * placeholder substitution.
 *
 * Substitution is a plain global string replace of the placeholder text
 * (`{userRequest}` / `{planFile}`) — no template engine. If the user removes
 * the placeholder, substitution is a no-op and that's their bug.
 */

import type { ExtensionContext } from 'vscode'
import { getSettings } from '../settings/store'

export function getBrainstormPrompt(
  ctx: ExtensionContext,
  vars: { userRequest: string, nonce: string, imagePaths?: string[] },
): string {
  const tpl = getSettings(ctx).brainstormPrompt
  let out = tpl
    .split('{userRequest}')
    .join(vars.userRequest)
    .split('{nonce}')
    .join(vars.nonce)
  if (vars.imagePaths && vars.imagePaths.length > 0) {
    const lines = vars.imagePaths.map(p => `- ${p}`).join('\n')
    out += `\n\n参考图片（请用 Read 工具查看）：\n${lines}`
  }
  return out
}

export function getBrainstormContinuePrompt(
  ctx: ExtensionContext,
  vars: { issueNumber: number, issueRef?: string, prototypeFile?: string },
): string {
  const tpl = getSettings(ctx).brainstormContinuePrompt
  // For youtrack cards the board number is synthetic; substitute the readable
  // id (e.g. LXF-12) so the cc agent references the real issue (readable via
  // `opencli yt issues show <id>`), not a non-existent gitea number.
  const out = tpl.split('{issueNumber}').join(vars.issueRef ?? String(vars.issueNumber))
  return fillPrototypeRef(out, vars.prototypeFile)
}

/**
 * `{prototypeRef}` 在模板里独占一段：有原型插件就填一段「先读它」的交代，
 * 没有就连同前后空行一起抹掉——否则模板里会留下一个空洞段落。
 */
function fillPrototypeRef(tpl: string, prototypeFile: string | undefined): string {
  if (!prototypeFile)
    return tpl.replace(/\n*\{prototypeRef\}\n*/g, '\n\n').trimEnd()
  const para = `工单已有原型插件 ${prototypeFile}，先读它了解已经定下来的界面和交互，在此基础上只对齐还不明确的地方，不要从零重画。`
  return tpl.split('{prototypeRef}').join(para)
}

export function getImplementPlanPrompt(ctx: ExtensionContext, vars: { planFile: string, issueNumber: number, issueRef?: string }): string {
  const tpl = getSettings(ctx).implementPlanPrompt
  return tpl
    .split('{planFile}')
    .join(vars.planFile)
    .split('{issueNumber}')
    .join(vars.issueRef ?? String(vars.issueNumber))
}

/**
 * 测试会话首个提示词。`prRef` 是给验收技能的定位线索：主 worktree 上是
 * 已合并的 PR，worktree 里就是那条分支。
 */
export function getTestPrompt(ctx: ExtensionContext, vars: { issueNumber: number, issueRef?: string, prRef: string }): string {
  const tpl = getSettings(ctx).testPrompt
  return tpl
    .split('{issueNumber}')
    .join(vars.issueRef ?? String(vars.issueNumber))
    .split('{prRef}')
    .join(vars.prRef)
}

/**
 * 原型会话首个提示词。只认工单号——原型是照工单正文画界面，与 PR / 分支无关。
 */
export function getPrototypePrompt(ctx: ExtensionContext, vars: { issueNumber: number, issueRef?: string }): string {
  const tpl = getSettings(ctx).prototypePrompt
  return tpl.split('{issueNumber}').join(vars.issueRef ?? String(vars.issueNumber))
}

export function getReviewPrompt(ctx: ExtensionContext, vars: { prNumber: string }): string {
  const tpl = getSettings(ctx).reviewPrompt
  return tpl.split('{prNumber}').join(vars.prNumber)
}