#!/usr/bin/env bash
# 任务启动门禁：precheck / start / sync / finish（配套 Makefile 同名目标）。
# 规范依据：collaboration.md 共同基线与同步节点、治理清理；delivery.md §1/§5。
set -euo pipefail

TARGET_BRANCH="${TASK_TARGET_BRANCH:-main}"

die() { echo "ERROR: $*" >&2; exit 1; }
need_repo() { git rev-parse --git-dir >/dev/null 2>&1 || die "not inside a git repository"; }
width() { python3 -c 'import sys,unicodedata;print(sum(2 if unicodedata.east_asian_width(c) in "WF" else 1 for c in sys.argv[1]))' "$1"; }

cmd_precheck() {
  need_repo
  git fetch -q origin "${TARGET_BRANCH}" 2>/dev/null || true
  local branch head rmain dirty sub_dirty
  branch=$(git rev-parse --abbrev-ref HEAD)
  head=$(git rev-parse HEAD)
  rmain=$(git rev-parse --verify -q "origin/${TARGET_BRANCH}" 2>/dev/null || echo "$head")
  dirty=$(git status --porcelain | { grep -v '^.. \.zcode/' || true; } | wc -l)
  sub_dirty=$(git submodule status --recursive 2>/dev/null | { grep -cE '^-|^\+|^U' || true; })
  local behind ahead
  behind=$(git rev-list --count "HEAD..origin/${TARGET_BRANCH}" 2>/dev/null || echo 0)
  ahead=$(git rev-list --count "origin/${TARGET_BRANCH}..HEAD" 2>/dev/null || echo 0)
  echo "[repo]   branch=${branch} head=$(echo "$head" | cut -c1-10)"
  echo "[remote] origin/${TARGET_BRANCH}=$(echo "$rmain" | cut -c1-10) ahead=${ahead} behind=${behind}"
  echo "[tree]   $([ "$dirty" -eq 0 ] && echo clean || echo "dirty(${dirty})") submodules_dirty=${sub_dirty}"
  local wt merged
  wt=$(git worktree list | tail -n +2 | wc -l)
  merged=$(git branch --merged "origin/${TARGET_BRANCH}" 2>/dev/null | { grep -vE 'main|master|\*' || true; } | tr -d ' +')
  echo "[worktrees] linked=${wt}"
  [ -n "$merged" ] && echo "[recycle] merged un-recycled branches: $(echo $merged)"
  echo "[required-reading] core/baseline.md, workflows/delivery.md §1$([ "$dirty" -gt 0 ] && echo ", standards/collaboration.md（树脏=他人或未收尾现场，不得写入）")"
  echo "[R0] $(echo "$rmain" | cut -c1-10)（完整：$rmain）"
  if [ "$dirty" -gt 0 ] || [ "$sub_dirty" -gt 0 ]; then
    echo "[verdict] SHARED_WORKSPACE_BUSY — 工作树不干净，不得写入；先收尾或经 owner 确认"
    exit 3
  fi
  if [ "$behind" -gt 0 ] && [ "$branch" = "${TARGET_BRANCH}" ]; then
    echo "[verdict] SYNC_REQUIRED — 本地 ${TARGET_BRANCH} 落后远端 ${behind} 提交；先 git pull --ff-only"
    exit 4
  fi
  echo "[verdict] READY — 可建任务工作区：make task-start NAME=feature/your-branch"
}

cmd_start() {
  need_repo
  local name="${1:-}"; [ -n "$name" ] || die "usage: task.sh start <feature|fix|hotfix>/<slug>"
  echo "$name" | grep -qE '^(feature|fix|hotfix|release)/[A-Za-z0-9._-]+$' || die "branch name must match (feature|fix|hotfix|release)/<slug>"
  git fetch -q origin "${TARGET_BRANCH}" 2>/dev/null || true
  [ "$(git status --porcelain | grep -v '^.. \.zcode/' | wc -l)" -eq 0 ] || die "dirty tree — resolve first (precheck verdict BUSY)"
  git merge-base --is-ancestor "origin/${TARGET_BRANCH}" HEAD || die "local ${TARGET_BRANCH} behind origin — pull --ff-only first"
  local rmain slug wt
  rmain=$(git rev-parse "origin/${TARGET_BRANCH}")
  slug=$(echo "$name" | tr '/' '-')
  wt="$(dirname "$(pwd)")/$(basename "$(pwd)")-wt-${slug}"
  [ -e "$wt" ] && die "worktree path exists: $wt"
  git worktree add -q "$wt" -b "$name" "$rmain"
  (cd "$wt" && git submodule update --init --recursive >/dev/null 2>&1 || echo "[warn] submodule init incomplete in worktree")
  local card="$wt/.task/${slug}.md"
  mkdir -p "$wt/.task"
  cat > "$card" <<EOF
# ${name} 任务卡

任务主记录：<PR 链接，task-finish 时填写>；状态：进行中；owner：$(git config user.name || echo unknown)

## 基线与授权

- 权威仓：$(git -C "$wt" remote get-url origin 2>/dev/null || echo '(local)')；目标分支：${TARGET_BRANCH}；R0（initial_base_sha）= ${rmain}
- 工作区：${wt}（worktree）；分支：${name}
- 授权与交付终点：<本次允许的动作与终点；未授权事项写明>

## 目标与非目标

<预期结果、受影响入口/模块/契约；明确不做什么。>

## 同步记录

| 节点 | sync_base_sha | tested_head_sha | checked_at |
|---|---|---|---|
| 启动 | ${rmain} | $(git -C "$wt" rev-parse HEAD) | $(date -u +%FT%TZ) |

## 结果与验证（完成后填写）

- 结果：
- 验证：
- 影响与剩余项：
EOF
  git -C "$wt" add .task && git -C "$wt" commit -q -m "Record the task card for ${slug}" && echo "[card] $card（已随分支提交）"
  echo "[started] branch=${name} worktree=${wt} R0=$(echo "$rmain" | cut -c1-10)"
}

cmd_sync() {
  need_repo
  git fetch -q origin "${TARGET_BRANCH}"
  [ "$(git status --porcelain | grep -v '^.. \.zcode/' | wc -l)" -eq 0 ] || die "dirty tree — 先显式提交；不隐式 stash（collaboration.md:11）"
  git merge --no-edit "origin/${TARGET_BRANCH}"
  git merge-base --is-ancestor "origin/${TARGET_BRANCH}" HEAD || die "sync incomplete"
  local base head card
  base=$(git rev-parse "origin/${TARGET_BRANCH}"); head=$(git rev-parse HEAD)
  card=$(ls .task/*.md 2>/dev/null | head -1 || true)
  if [ -n "$card" ]; then
    printf '| 同步前验收 | %s | %s | %s |\n' "$base" "$head" "$(date -u +%FT%TZ)" >> "$card"
    git add "$card"
    git commit -q -m "Record the sync checkpoint" || true
  fi
  echo "[synced] sync_base=$(echo "$base" | cut -c1-10) tested_head=$(echo "$head" | cut -c1-10) checked_at=$(date -u +%FT%TZ)"
  echo "[next] 跑正式验收（make test 等），证据写入任务卡"
}

cmd_finish() {
  need_repo
  local abandon="${1:-}"
  local branch head common mainrepo
  branch=$(git rev-parse --abbrev-ref HEAD)
  head=$(git rev-parse HEAD)
  common=$(git rev-parse --git-common-dir); common=$(cd "$common" && pwd)
  mainrepo=$(dirname "$common")
  git fetch -q origin "${TARGET_BRANCH}" 2>/dev/null || true
  if [ "$abandon" = "--abandon" ]; then
    local reason="${2:-}"; [ -n "$reason" ] || die "--abandon 需要原因：task.sh finish --abandon <reason>"
    local untracked; untracked=$(git status --porcelain | grep -c '^??' || true)
    [ "$untracked" -gt 0 ] && die "存在 ${untracked} 个未跟踪文件 — 先处置或用 task-finish FORCE_ABANDON=1"
    [ "${FORCE_ABANDON:-0}" = "1" ] || { echo "[confirm] 放弃未合入工作属破坏性动作：重跑 FORCE_ABANDON=1 task.sh finish --abandon \"${reason}\""; exit 5; }
    echo "[abandoned] branch=${branch} reason=${reason} recorded_at=$(date -u +%FT%TZ)"
  else
    git merge-base --is-ancestor "$head" "origin/${TARGET_BRANCH}" || die "分支未合入 origin/${TARGET_BRANCH}——先走 PR 合入；放弃则用 --abandon <reason>"
    echo "[verified] ${branch} 已包含于 origin/${TARGET_BRANCH}；成果已落盘"
  fi
  git submodule deinit --all -f >/dev/null 2>&1 || true
  # git 对含 gitlink 的 worktree 无条件拒绝 remove（查索引，与 deinit 无关）：
  # 已验证合入且子模块已 deinit 后，直接清目录并 prune。
  git -C "$mainrepo" worktree remove "$PWD" 2>/dev/null || { rm -rf "$PWD"; git -C "$mainrepo" worktree prune; }
  git -C "$mainrepo" branch -d "$branch" 2>/dev/null || git -C "$mainrepo" branch -D "$branch"
  git -C "$mainrepo" worktree prune
  git push -q --delete origin "$branch" 2>/dev/null || true
  echo "[recycled] worktree 与分支 ${branch} 已回收（本地+远端，$(date -u +%FT%TZ)）"
}

case "${1:-}" in
  precheck) shift; cmd_precheck "$@" ;;
  start) shift; cmd_start "$@" ;;
  sync) shift; cmd_sync "$@" ;;
  finish) shift; cmd_finish "$@" ;;
  *) echo "usage: task.sh <precheck|start|sync|finish> [args]"; exit 2 ;;
esac