/**
 * 工具栏「发布」按钮的扩展侧 handler：切新发布分支、摘修复到当期发布分支、触发正式服部署。
 *
 * git 逻辑在 `src/git/release.ts`，Jenkins 触发在 `src/jenkins/trigger.ts`；这里只负责
 * 读设置、弹 QuickPick、发 toast、维护 `panel.releaseRunning` 互斥。
 */

import type { KanbanWebviewPanel } from '../KanbanPanel'
import { window, workspace } from 'vscode'
import { gitFetch } from '../../git/branches'
import {
  attachPulls,
  cherryPickToRelease,
  cutRelease,
  getReleaseStatus,
  groupCommitsByPr,
  indexUnreleasedByMergePr,
  listReleaseBranches,
  listUnreleasedCommits,
  todayReleaseBranch,
} from '../../git/release'
import { triggerJenkinsBuild } from '../../jenkins/trigger'
import { getSettings } from '../../settings/store'
import { dismiss, toast } from './handoffFlow'

export async function handleReleaseStatus(panel: KanbanWebviewPanel): Promise<void> {
  const root = workspace.workspaceFolders?.[0]?.uri.fsPath
  const s = getSettings(panel.context)
  const base = {
    type: 'release/status' as const,
    devBranch: s.devBranch,
    nextBranch: todayReleaseBranch(s.releaseBranchPrefix),
    running: panel.releaseRunning,
    // webview 只在设置弹窗打开时才有设置快照，「部署」菜单项是否显示由这里告诉它
    jenkinsConfigured: s.jenkinsJob.length > 0,
  }
  if (!root) {
    panel.postMessage({ ...base, unreleased: 0, unavailable: '请先打开一个工作区文件夹' })
    return
  }
  const st = await getReleaseStatus({ cwd: root, devBranch: s.devBranch, prefix: s.releaseBranchPrefix })
  panel.postMessage({ ...base, current: st.current, unreleased: st.unreleased, unavailable: st.unavailable })
}

function requireRoot(): string {
  const root = workspace.workspaceFolders?.[0]?.uri.fsPath
  if (!root)
    throw new Error('请先打开一个工作区文件夹')
  return root
}

/** 三个写动作共用：互斥 + 前后刷新状态 + 统一错误 toast */
async function runReleaseAction(panel: KanbanWebviewPanel, fn: () => Promise<void>): Promise<void> {
  if (panel.releaseRunning)
    return
  panel.releaseRunning = true
  void handleReleaseStatus(panel)
  try {
    await fn()
  }
  catch (err) {
    toast(panel, 'error', err instanceof Error ? err.message : String(err), { dismissOnTimer: 10_000 })
  }
  finally {
    panel.releaseRunning = false
    void handleReleaseStatus(panel)
  }
}

async function deploy(panel: KanbanWebviewPanel, branch: string): Promise<void> {
  const s = getSettings(panel.context)
  await triggerJenkinsBuild({ job: s.jenkinsJob, params: { REF: branch, REMOTE_HOST: s.jenkinsProdHost } })
  toast(panel, 'success', `已触发 Jenkins ${s.jenkinsJob}：REF=${branch} → ${s.jenkinsProdHost}`)
}

export function handleReleaseCut(panel: KanbanWebviewPanel): Promise<void> {
  return runReleaseAction(panel, async () => {
    const root = requireRoot()
    const s = getSettings(panel.context)
    const branch = todayReleaseBranch(s.releaseBranchPrefix)
    const count = await cutRelease({ cwd: root, devBranch: s.devBranch, branch })
    toast(panel, 'success', `已切发布分支 ${branch}（${count} 个提交）`)
    if (!s.jenkinsJob)
      return
    const pick = await window.showInformationMessage(`现在部署 ${branch} 到${s.jenkinsProdHost}？`, '部署')
    if (pick === '部署')
      await deploy(panel, branch)
  })
}

export async function handleReleaseCherryPick(panel: KanbanWebviewPanel): Promise<void> {
  try {
    const root = requireRoot()
    const s = getSettings(panel.context)
    const status = await getReleaseStatus({ cwd: root, devBranch: s.devBranch, prefix: s.releaseBranchPrefix })
    if (status.unavailable)
      throw new Error(status.unavailable)
    const current = status.current
    if (!current)
      throw new Error('尚无发布分支，先切新发布')
    const commits = await listUnreleasedCommits({ cwd: root, devBranch: s.devBranch, current })
    if (commits.length === 0) {
      toast(panel, 'info', '没有待摘的提交')
      return
    }
    const index = await indexUnreleasedByMergePr({
      cwd: root,
      current,
      devBranch: s.devBranch,
      shas: commits.map(c => c.sha),
    })
    panel.postMessage({
      type: 'release/pick-show',
      branch: current,
      groups: groupCommitsByPr(attachPulls(commits, index)),
      firstAfterReleaseSha: commits.at(-1)?.sha,
    })
  }
  catch (err) {
    toast(panel, 'error', err instanceof Error ? err.message : String(err), { dismissOnTimer: 10_000 })
  }
}

export function handleReleaseCherryPickConfirm(panel: KanbanWebviewPanel, shas: string[]): Promise<void> {
  return runReleaseAction(panel, async () => {
    if (shas.length === 0)
      return
    const root = requireRoot()
    const s = getSettings(panel.context)
    const status = await getReleaseStatus({ cwd: root, devBranch: s.devBranch, prefix: s.releaseBranchPrefix })
    if (status.unavailable)
      throw new Error(status.unavailable)
    const current = status.current
    if (!current)
      throw new Error('尚无发布分支，先切新发布')
    const commits = await listUnreleasedCommits({ cwd: root, devBranch: s.devBranch, current })
    const order = new Map(commits.map((c, i) => [c.sha, i]))
    const ordered = [...shas].sort((a, b) => (order.get(b) ?? 0) - (order.get(a) ?? 0))
    const spinner = toast(panel, 'info', `正在摘 ${ordered.length} 个提交到 ${current}…`, { spinner: true, dismissOnTimer: 0 })
    try {
      await cherryPickToRelease({ cwd: root, branch: current, shas: ordered })
    }
    finally {
      dismiss(panel, spinner)
    }
    toast(panel, 'success', `已摘 ${ordered.length} 个提交到 ${current}`)
  })
}

export function handleReleaseDeploy(panel: KanbanWebviewPanel): Promise<void> {
  return runReleaseAction(panel, async () => {
    const root = requireRoot()
    const s = getSettings(panel.context)
    if (!s.jenkinsJob)
      throw new Error('未配置 Jenkins 任务名，请先在设置里填写')
    await gitFetch(root)
    const branches = await listReleaseBranches({ cwd: root, prefix: s.releaseBranchPrefix })
    if (branches.length === 0)
      throw new Error('尚无发布分支')
    const [current, ...older] = branches
    const items = [
      { label: current, description: '当期' },
      ...older.map(label => ({ label, description: '回滚到此发布点' })),
    ]
    const pick = await window.showQuickPick(items, {
      title: `部署到${s.jenkinsProdHost}`,
      placeHolder: '选择要部署的发布分支（默认当期，选旧的即回滚）',
    })
    if (!pick)
      return
    await deploy(panel, pick.label)
  })
}