package render

import (
	"encoding/json"
	"fmt"
	"strings"
	"time"

	"git.5iot.com/iotlcm-public/iotlcm-bot/internal/archive"
)

// Kind 返回卡片标题用的中文名称。流量同步有日、月历史、本月快照三条链路，
// 标题必须能区分，否则运营无法从卡片判断是哪一类同步。
func Kind(operation string) string {
	switch operation {
	case "previous_day_usage_full_sync":
		return "日流量同步"
	case "previous_month_usage_full_sync":
		return "月历史同步"
	case "current_month_usage_full_sync":
		return "本月流量快照同步"
	}
	if strings.Contains(operation, "sim_status") {
		return "卡状态全量同步"
	}
	if isTrafficUsage(operation) {
		return "流量全量同步"
	}
	return operation
}

// isTrafficUsage 判定 operation 是否属于流量族（日、月历史、本月快照及兼容旧操作名）。
// 供料观测等按链路区分的行为用它判断，避免依赖 Kind 返回的中文标题。
func isTrafficUsage(operation string) bool {
	return strings.Contains(operation, "traffic") || strings.Contains(operation, "usage")
}

func Text(a archive.RunArchive, environment string) string {
	title := fmt.Sprintf("【%s｜%s】", environment, Kind(a.Run.Operation))
	startAt, endAt := executionTimes(a)
	lines := []string{
		title,
		"",
		fmt.Sprintf("总数：%s", number(a.TotalCount())),
		fmt.Sprintf("成功：%s", number(a.Run.SuccessCount)),
		fmt.Sprintf("失败：%s", number(a.Run.FailedCount)),
		fmt.Sprintf("成功率：%.2f%%", a.SuccessRate()),
		fmt.Sprintf("开始时间：%s", timestamp(startAt)),
		fmt.Sprintf("结束时间：%s", timestamp(endAt)),
		fmt.Sprintf("总耗时：%s", duration(a.Duration())),
		fmt.Sprintf("实际执行：%d 轮", len(a.Rounds)),
		"",
		"轮次结果：",
	}
	for _, r := range a.Rounds {
		lines = append(lines, roundLine(r))
	}
	if block := supplyBlock(a); block != "" {
		lines = append(lines, "", block)
	}
	lines = append(lines, "", "Run："+a.Run.RunID)
	return strings.Join(lines, "\n")
}

func Card(a archive.RunArchive, environment string) ([]byte, error) {
	title := fmt.Sprintf("%s · %s", displayEnvironment(environment), Kind(a.Run.Operation))
	startAt, endAt := executionTimes(a)
	// Full sync runs commonly have final failures; use one neutral header color.
	template := "blue"
	elements := []any{
		fields(
			field("总数", number(a.TotalCount())),
			field("成功", number(a.Run.SuccessCount)),
			field("失败", number(a.Run.FailedCount)),
			field("成功率", fmt.Sprintf("%.2f%%", a.SuccessRate())),
			field("开始时间", timestamp(startAt)),
			field("结束时间", timestamp(endAt)),
			field("总耗时", duration(a.Duration())),
			field("实际轮次", fmt.Sprintf("%d轮", len(a.Rounds))),
		),
		map[string]any{"tag": "hr"},
	}
	for _, r := range a.Rounds {
		elements = append(elements, map[string]any{
			"tag":  "div",
			"text": map[string]any{"tag": "lark_md", "content": roundBlock(r)},
		})
	}
	if block := supplyBlock(a); block != "" {
		elements = append(elements, map[string]any{"tag": "div", "text": map[string]any{"tag": "lark_md", "content": block}})
	}
	elements = append(elements,
		map[string]any{"tag": "hr"},
		map[string]any{"tag": "note", "elements": []any{map[string]any{"tag": "plain_text", "content": "Run: " + a.Run.RunID}}},
	)
	card := map[string]any{
		"msg_type": "interactive",
		"card": map[string]any{
			"header":   map[string]any{"template": template, "title": map[string]any{"tag": "plain_text", "content": title}},
			"elements": elements,
		},
	}
	return json.Marshal(card)
}

func fields(values ...map[string]any) map[string]any {
	entries := make([]any, len(values))
	for i, value := range values {
		entries[i] = value
	}
	return map[string]any{"tag": "div", "fields": entries}
}

func field(label, value string) map[string]any {
	return map[string]any{
		"is_short": true,
		"text":     map[string]any{"tag": "lark_md", "content": fmt.Sprintf("**%s**\n%s", label, value)},
	}
}

func roundBlock(r archive.RoundStats) string {
	return fmt.Sprintf("**第 %d 轮 · %s 张 · %s**\n成功 %s（%.2f%%）\n进入下轮 %s · 终态失败 %s", r.Round, number(r.EnqueuedCount), duration(r.Duration()), number(r.SuccessCount), r.SuccessRate(), number(r.NextRoundCount), number(r.FailedCount))
}

func displayEnvironment(environment string) string {
	switch environment {
	case "preview":
		return "预演"
	case "prod", "production":
		return "生产"
	default:
		return environment
	}
}

func roundLine(r archive.RoundStats) string {
	return fmt.Sprintf("第 %d 轮｜%s 张｜成功 %s（%.2f%%）｜进入下轮 %s｜终态失败 %s｜%s", r.Round, number(r.EnqueuedCount), number(r.SuccessCount), r.SuccessRate(), number(r.NextRoundCount), number(r.FailedCount), duration(r.Duration()))
}

func executionTimes(a archive.RunArchive) (string, string) {
	if len(a.Rounds) == 0 {
		return a.Run.CreatedAt, a.Run.CompletedAt
	}
	return a.Rounds[0].StartedAt, a.Rounds[len(a.Rounds)-1].CompletedAt
}

func timestamp(value string) string {
	t, err := time.Parse(time.RFC3339Nano, value)
	if err != nil {
		return value
	}
	return t.In(time.FixedZone("CST", 8*60*60)).Format("2006-01-02 15:04:05")
}

func number(n int64) string {
	negative := n < 0
	if negative {
		n = -n
	}
	s := fmt.Sprintf("%d", n)
	for i := len(s) - 3; i > 0; i -= 3 {
		s = s[:i] + "," + s[i:]
	}
	if negative {
		return "-" + s
	}
	return s
}

func duration(d time.Duration) string {
	seconds := int64(d / time.Second)
	if seconds < 0 {
		return "未记录"
	}
	h, m, s := seconds/3600, (seconds%3600)/60, seconds%60
	parts := make([]string, 0, 3)
	if h > 0 {
		parts = append(parts, fmt.Sprintf("%d小时", h))
	}
	if m > 0 {
		parts = append(parts, fmt.Sprintf("%d分", m))
	}
	if s > 0 || len(parts) == 0 {
		parts = append(parts, fmt.Sprintf("%d秒", s))
	}
	return strings.Join(parts, "")
}