package main

import "testing"

// TestSplitFlagsAndArgs 锁住「flags 与位置参数任意顺序」这条。
//
// 这条不是洁癖：`spdump columns t_campus -db yuansiwei_2026` 这种直觉写法若丢掉了 `-db`，
// 工具会连到默认库、查不到列、打印 "(0 行)" —— 一个看起来正常的错误答案。
func TestSplitFlagsAndArgs(t *testing.T) {
	valueFlags := map[string]bool{"-db": true, "--db": true, "-like": true, "--like": true}

	cases := []struct {
		name      string
		in        []string
		wantFlags []string
		wantPos   []string
	}{
		{
			name:      "flags 在前",
			in:        []string{"-db", "yuansiwei_2026", "t_campus"},
			wantFlags: []string{"-db", "yuansiwei_2026"},
			wantPos:   []string{"t_campus"},
		},
		{
			name:      "flags 在后（直觉写法，必须支持）",
			in:        []string{"t_campus", "-db", "yuansiwei_2026"},
			wantFlags: []string{"-db", "yuansiwei_2026"},
			wantPos:   []string{"t_campus"},
		},
		{
			name:      "等号形式",
			in:        []string{"t_campus", "-db=yuansiwei"},
			wantFlags: []string{"-db=yuansiwei"},
			wantPos:   []string{"t_campus"},
		},
		{
			name:      "两个值型 flag 交错",
			in:        []string{"x", "-like", "%a%", "-db", "finance_bk"},
			wantFlags: []string{"-like", "%a%", "-db", "finance_bk"},
			wantPos:   []string{"x"},
		},
		{
			name:      "纯位置参数",
			in:        []string{"sp_user_expense_baddebt", "sp_user_expense_recharge"},
			wantFlags: nil,
			wantPos:   []string{"sp_user_expense_baddebt", "sp_user_expense_recharge"},
		},
		{
			name:      "SQL 语句里的短横线不能被当 flag",
			in:        []string{"-db", "finance_bk", "select * from t where a=-1"},
			wantFlags: []string{"-db", "finance_bk"},
			wantPos:   []string{"select * from t where a=-1"},
		},
	}
	for _, c := range cases {
		gotFlags, gotPos := splitFlagsAndArgs(c.in, valueFlags)
		if !eq(gotFlags, c.wantFlags) {
			t.Errorf("%s：flags = %v, want %v", c.name, gotFlags, c.wantFlags)
		}
		if !eq(gotPos, c.wantPos) {
			t.Errorf("%s：pos = %v, want %v", c.name, gotPos, c.wantPos)
		}
	}
}

func eq(a, b []string) bool {
	if len(a) != len(b) {
		return false
	}
	for i := range a {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}

// TestReadOnlyPrefixes 保证 `sql` 子命令只放行只读语句的前缀判断是可靠的。
func TestReadOnlyPrefixes(t *testing.T) {
	allowed := []string{"select 1", "SELECT * FROM t", "show create table t", "desc t", "explain select 1"}
	for _, s := range allowed {
		if !allowedSQL(s) {
			t.Errorf("应当放行：%q", s)
		}
	}
	denied := []string{
		"update t set a=1",
		"delete from t",
		"drop table t",
		"insert into t values (1)",
		"select 1; drop table t", // 分号后第二条 → 拒绝
		"",
	}
	for _, s := range denied {
		if allowedSQL(s) {
			t.Errorf("应当拒绝：%q", s)
		}
	}
}