package holiday

// fallbackData 内置的 2024-2026 年中国法定节假日/调休数据，
// 数据严格来自国务院办公厅历年《关于部分节假日安排的通知》原文。
//
// 用途：当外网接口不可达（内网部署、机房无外网出口、接口临时故障）且数据库
// 中也没有对应年份数据时，用本表兜底，保证日历控件always能显示休/班标记。
//
// 维护约定：每年 11 月国务院办公厅发布次年通知后，按下述格式补齐新一年数据
// （只补休假日与调休上班日两类，普通周末由前端按星期判定，不入表）：
//
//	notices = append(notices, yearNotice{Year: 2027, ...})
//
// 注意：这里只存"放假"与"补班"两类特殊日期；普通周六日不记录。
var fallbackData = buildFallback()

// yearNotice 单一年度的放假安排，按通知原文逐条录入。
type yearNotice struct {
	Year int
	// Holidays 放假日期区间：[开始日, 结束日]，闭区间。
	// 结束日与开始日相同表示只放一天；空串表示结束日等于开始日。
	Holidays []dayRange
	// Workdays 调休上班日（周末补班）。
	Workdays []string
}

type dayRange struct {
	Start string
	End   string
	Name  string
}

// yearNotices 各界各类节日的原始安排。
//
// 数据来源：
//   - 2024：国办发明电〔2023〕7号
//   - 2025：国办发明电〔2024〕12号
//   - 2026：2025年11月4日国办通知
var yearNotices = []yearNotice{
	{
		Year: 2024,
		Holidays: []dayRange{
			{Start: "2024-01-01", Name: "元旦"},
			{Start: "2024-02-10", End: "2024-02-17", Name: "春节"},
			{Start: "2024-04-04", End: "2024-04-06", Name: "清明节"},
			{Start: "2024-05-01", End: "2024-05-05", Name: "劳动节"},
			{Start: "2024-06-10", Name: "端午节"},
			{Start: "2024-09-15", End: "2024-09-17", Name: "中秋节"},
			{Start: "2024-10-01", End: "2024-10-07", Name: "国庆节"},
		},
		Workdays: []string{
			"2024-02-04", "2024-02-18",
			"2024-04-07",
			"2024-04-28", "2024-05-11",
			"2024-09-14",
			"2024-09-29", "2024-10-12",
		},
	},
	{
		Year: 2025,
		Holidays: []dayRange{
			{Start: "2025-01-01", Name: "元旦"},
			{Start: "2025-01-28", End: "2025-02-04", Name: "春节"},
			{Start: "2025-04-04", End: "2025-04-06", Name: "清明节"},
			{Start: "2025-05-01", End: "2025-05-05", Name: "劳动节"},
			{Start: "2025-05-31", End: "2025-06-02", Name: "端午节"},
			{Start: "2025-10-01", End: "2025-10-08", Name: "国庆节、中秋节"},
		},
		Workdays: []string{
			"2025-01-26", "2025-02-08",
			"2025-04-27",
			"2025-09-28", "2025-10-11",
		},
	},
	{
		Year: 2026,
		Holidays: []dayRange{
			{Start: "2026-01-01", End: "2026-01-03", Name: "元旦"},
			{Start: "2026-02-15", End: "2026-02-23", Name: "春节"},
			{Start: "2026-04-04", End: "2026-04-06", Name: "清明节"},
			{Start: "2026-05-01", End: "2026-05-05", Name: "劳动节"},
			{Start: "2026-06-19", End: "2026-06-21", Name: "端午节"},
			{Start: "2026-09-25", End: "2026-09-27", Name: "中秋节"},
			{Start: "2026-10-01", End: "2026-10-07", Name: "国庆节"},
		},
		Workdays: []string{
			"2026-01-04",
			"2026-02-14", "2026-02-28",
			"2026-05-09",
			"2026-09-20", "2026-10-10",
		},
	},
}

// buildFallback 把 yearNotices 展开成按日期索引的 Day 列表。
func buildFallback() []Day {
	out := make([]Day, 0, 256)
	for _, n := range yearNotices {
		for _, r := range n.Holidays {
			for _, d := range expandRange(r.Start, r.End) {
				out = append(out, Day{
					Date:   d,
					Name:   r.Name,
					Type:   TypeHoliday,
					Year:   n.Year,
					Source: SourceBuiltin,
				})
			}
		}
		for _, d := range n.Workdays {
			out = append(out, Day{
				Date:   d,
				Name:   "调休上班",
				Type:   TypeWorkday,
				Year:   n.Year,
				Wage:   1,
				Source: SourceBuiltin,
			})
		}
	}
	return out
}