#!/usr/bin/env bash
set -euo pipefail

# dev-flow 收尾检查 + index 派生
#   检查模式: check-dev-flow.sh <slug>          → 对 openspec/changes/<slug>/ 执行三项收尾检查
#   索引模式: check-dev-flow.sh --index         → 扫描 openspec/changes/archive/ 与 openspec/archive/ 生成 devflow/index.md
#   全量模式: check-dev-flow.sh --all           → 对所有活跃 change 执行检查
#
# 三项收尾检查:
#   1. decision.md 存在(豁免需显式: decision.md 或提交信息中写明)
#   2. 含 ## Alternatives considered 或显式 <!-- alternatives-not-recorded -->
#   3. ## Verification 无"已确认 X"类不可重跑结论

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
CHANGES_ROOT="$PROJECT_ROOT/openspec/changes"

fail() { echo "✗ $1" >&2; exit 1; }

check_change() {
    local slug="$1"
    local dir="$CHANGES_ROOT/$slug"
    local decision="$dir/decision.md"
    local errors=0

    [ -d "$dir" ] || fail "change 目录不存在: openspec/changes/$slug"

    echo "== dev-flow 收尾检查: $slug =="

    # 1. decision.md 存在
    if [ ! -f "$decision" ]; then
        echo "✗ [1] 缺少 openspec/changes/$slug/decision.md (纯机械改动可豁免,但豁免必须显式写在提交信息里)"
        errors=$((errors+1))
    else
        echo "✓ [1] decision.md 存在"

        # 2. Alternatives 强制
        if grep -q '^## Alternatives considered' "$decision" || grep -q '<!-- alternatives-not-recorded -->' "$decision"; then
            echo "✓ [2] 备选已记录或显式声明未记录"
        else
            echo "✗ [2] decision.md 缺少 ## Alternatives considered,也没有 <!-- alternatives-not-recorded --> 显式豁免"
            errors=$((errors+1))
        fi

        # 3. Verification 无不可重跑结论
        local vtext
        vtext="$(awk '/^## Verification/{flag=1;next} /^## /{flag=0} flag' "$decision")"
        if echo "$vtext" | grep -qE '已确认|已验证[^,。;(]|测试通过$'; then
            echo "✗ [3] ## Verification 含不可重跑的结论(如\"已确认 X 存在\")——改为可重跑的命令或明确的人工步骤"
            errors=$((errors+1))
        elif [ -z "$vtext" ]; then
            echo "✗ [3] 缺少 ## Verification 小节"
            errors=$((errors+1))
        else
            echo "✓ [3] Verification 通过"
        fi
    fi

    if [ "$errors" -gt 0 ]; then
        echo "== $slug: $errors 项未通过 =="
        return 1
    fi
    echo "== $slug: 全部通过 =="
    return 0
}

gen_index() {
    local out="$PROJECT_ROOT/devflow/index.md"
    echo "# devflow 索引" > "$out"
    echo "" >> "$out"
    echo "> 本文件由 scripts/check-dev-flow.sh --index 派生生成,**不要手写**。" >> "$out"
    echo "> 存储层是 openspec/archive/ 下的归档目录;此处只是浏览视图。" >> "$out"
    echo "" >> "$out"

    local found=0
    local rows=()
    local arch_dir
    # 两个历史归档位置都扫:openspec/changes/archive/ 与 openspec/archive/
    for arch_dir in "$CHANGES_ROOT/archive" "$PROJECT_ROOT/openspec/archive"; do
        [ -d "$arch_dir" ] || continue
        local d
        while IFS= read -r d; do
            d="${d%/}"
            [ -d "$d" ] || continue
            local name; name="$(basename "$d")"
            local title; title=""
            local date; date=""
            local rel; rel="${d#"$PROJECT_ROOT"/}"
            # 标题取 decision.md 首行,否则 proposal.md 首个 # 标题
            if [ -f "$d/decision.md" ]; then
                title="$(head -1 "$d/decision.md" | sed 's/^# *//; s/^[[:space:]]*//; s/[[:space:]]*$//' || true)"
            elif [ -f "$d/proposal.md" ]; then
                title="$(grep -m1 '^# ' "$d/proposal.md" | sed 's/^# *//' || true)"
            fi
            # 日期取目录名前缀 YYYY-MM-DD
            if [[ "$name" =~ ^([0-9]{4}-[0-9]{2}-[0-9]{2}) ]]; then
                date="${BASH_REMATCH[1]}"
            fi
            rows+=("| ${date:-—} | ${title:-$name} | ${rel} |")
            found=$((found+1))
        done < <(find "$arch_dir" -mindepth 1 -maxdepth 1 -type d | sort)
    done

    # 写表格(带表头)
    {
        echo "| 日期 | 标题 | 归档位置 |"
        echo "|---|---|---|"
        if [ ${#rows[@]} -gt 0 ]; then
            printf '%s\n' "${rows[@]}"
        fi
    } >> "$out"

    echo "[index] 生成 $found 个归档条目 → devflow/index.md"
}

case "${1:-}" in
    --index)
        gen_index
        ;;
    --all)
        rc=0
        for d in "$CHANGES_ROOT"/*/; do
            d="${d%/}"
            [ -d "$d" ] || continue
            name="$(basename "$d")"
            [ "$name" = "archive" ] && continue
            check_change "$name" || rc=1
        done
        exit $rc
        ;;
    "")
        echo "用法: check-dev-flow.sh <slug> | --all | --index" >&2
        echo "  <slug>    对单个活跃 change 执行三项收尾检查" >&2
        echo "  --all     检查所有活跃 change" >&2
        echo "  --index   扫描归档生成 devflow/index.md" >&2
        exit 2
        ;;
    *)
        check_change "$1"
        ;;
esac