package fixture

import (
	"fmt"
	"io"
	"strings"
)

// 本文件只做**终端报告排版**，不含任何业务判断。
// 排版目标是「能直接贴进报告文档」：定宽列 + 明确的 ✔/✘ 标记。

const (
	markOK   = "✔"
	markFail = "✘"
)

// PrintDDLReport 打印结构补齐结果。
func PrintDDLReport(w io.Writer, r *DDLReport) {
	fmt.Fprintf(w, "== core 结构补齐 ==\n")
	fmt.Fprintf(w, "DDL 文件：%s\n", r.Path)
	fmt.Fprintf(w, "表数：%d → %d\n", r.TablesBefore, r.TablesAfter)
	fmt.Fprintf(w, "新增（%d）：%s\n", len(r.Created), strings.Join(r.Created, ", "))
	fmt.Fprintf(w, "跳过已存在（%d）：%s\n", len(r.Skipped), strings.Join(r.Skipped, ", "))
	dropped := 0
	seeds := 0
	for _, a := range r.Actions {
		switch a.Kind {
		case "skipped-drop":
			dropped++
		case "seed":
			seeds++
		}
	}
	fmt.Fprintf(w, "丢弃的 DROP TABLE 语句：%d 条（不执行）\n", dropped)
	fmt.Fprintf(w, "执行的 INSERT IGNORE 种子：%d 条（幂等）\n", seeds)
}

// PrintMapReport 打印搬数据结果。
func PrintMapReport(w io.Writer, r *MapReport) {
	fmt.Fprintf(w, "== 映射与装载 ==\n")
	fmt.Fprintf(w, "legacy userid：%d\n", r.LegacyUserID)
	fmt.Fprintf(w, "canonical_user_id：%s\n", r.CanonicalUserID)
	fmt.Fprintf(w, "legacy 行数：t_user_expense=%d, t_user_expense_school=%d, t_user_expense_log=%d（合计 %d）\n",
		r.LegacyCounts["t_user_expense"], r.LegacyCounts["t_user_expense_school"],
		r.LegacyCounts["t_user_expense_log"], r.LegacyRows)
	fmt.Fprintf(w, "写入：t_user=%d 行, t_legacy_mapping=%d 行（含创建人 %d 个）\n",
		r.UsersWritten, r.MappingsWritten, len(r.CreatorIDs))
	fmt.Fprintf(w, "流水 id（D1 原样保留）：%v\n", r.LogIDs)
	if len(r.Samples) > 0 {
		fmt.Fprintf(w, "流水样本（remark 已脱敏）：\n")
		for _, s := range r.Samples {
			fmt.Fprintf(w, "  id=%-8d type=%-4d money=%-12s create_time=%s remark=%s\n",
				s.ID, s.Type, s.Money, s.CreateTime, s.RemarkMask)
		}
	}
	if len(r.Warnings) > 0 {
		fmt.Fprintf(w, "映射告警（%d）：\n", len(r.Warnings))
		for _, x := range r.Warnings {
			fmt.Fprintf(w, "  - %s\n", x)
		}
	} else {
		fmt.Fprintf(w, "映射告警：无\n")
	}
}

// PrintVerifyReport 打印逐列核对表 + 断言 + 两组证据。
func PrintVerifyReport(w io.Writer, r *VerifyReport) {
	fmt.Fprintf(w, "== 逐列核对 ==\n")
	for _, table := range r.SortedTableNames() {
		fmt.Fprintf(w, "\n-- %s --\n", table)
		fmt.Fprintf(w, "  %s %-26s %-26s %-26s %-26s %s\n", "st", "rowKey", "column", "legacy", "target", "note")
		for _, c := range r.Checks {
			if c.Table != table {
				continue
			}
			st := markOK
			if !c.Equal {
				st = markFail
			}
			fmt.Fprintf(w, "  %s %-26s %-26s %-26s %-26s %s\n",
				st, c.RowKey, c.Column, truncate(c.Legacy, 26), truncate(c.Target, 26), c.Note)
		}
	}

	fmt.Fprintf(w, "\n== 语义断言 ==\n")
	for _, a := range r.Assertions {
		st := markOK
		if !a.Pass {
			st = markFail
		}
		fmt.Fprintf(w, "  %s %s\n     %s\n", st, a.Name, a.Detail)
	}

	fmt.Fprintf(w, "\n== float 陷阱证据（legacy 逐条 3 位小数）==\n")
	f := r.FloatTrap
	for i := range f.LegacyValues {
		fmt.Fprintf(w, "  [%d] legacy=%-12s ROUND(x,2)=%-10s\n", i, f.LegacyValues[i], f.PerRowRounded[i])
	}
	fmt.Fprintf(w, "  Σ ROUND(x,2)  = %s（迁移口径，逐行取整后相加）\n", f.SumRoundedStr)
	fmt.Fprintf(w, "  ROUND(Σ x, 2) = %s（旧口径，先加后取整）\n", f.RoundOfSumStr)
	fmt.Fprintf(w, "  两者分差      = %d 分\n", f.DeltaVsPerRow)
	fmt.Fprintf(w, "  float64 直接累加 = %s（精确和 = %s）\n",
		FormatFloat(f.FloatSumRaw), CentsToDecimal(f.ExactSumThousandths/10))
	fmt.Fprintf(w, "  float64 累加误差 = %s\n", FormatFloat(f.FloatAccumErr))

	fmt.Fprintf(w, "\n== AUTO_INCREMENT 不倒退 ==\n")
	a := r.AutoIncTest
	st := markOK
	if !a.Pass {
		st = markFail
	}
	fmt.Fprintf(w, "  %s 真实表 t_user_expense_log：max(id)=%d, AUTO_INCREMENT=%d（= max+1? %v）\n",
		st, a.MaxIDBefore, a.AutoIncrementVal, a.EqualsMaxPlusOne)
	fmt.Fprintf(w, "     不带 id 插入 → id=%d（= 计数器 %d）⇒ 计数器没有被显式插 id 重置\n",
		a.ProbeID, a.ExpectedProbeID)
	stm := markOK
	if !a.MirrorPass {
		stm = markFail
	}
	fmt.Fprintf(w, "  %s 临时表镜像（CREATE TEMPORARY TABLE ... LIKE）：显式插 id=%d → 不带 id 插入得到 id=%d（期望 %d）\n",
		stm, a.MirrorExplicitID, a.MirrorProbeID, a.MirrorExpected)

	fmt.Fprintf(w, "\n核对结论：%s（不等列数 + 失败断言数 = %d）\n", verdict(r.OK()), r.FailCount())
}

// PrintCleanReport 打印清理结果。
func PrintCleanReport(w io.Writer, r *CleanReport) {
	fmt.Fprintf(w, "== 清理 ==\n")
	fmt.Fprintf(w, "删除的 canonical_user_id（%d 个）：%s\n", len(r.CanonicalIDs), strings.Join(r.CanonicalIDs, ", "))
	for _, t := range []string{"t_user_expense", "t_user_expense_school", "t_user_expense_log", "t_legacy_mapping", "t_user"} {
		fmt.Fprintf(w, "  %-24s 删除 %-4d 行，剩余全表 %d 行\n", t, r.Deleted[t], r.Remaining[t])
	}
	zero := true
	for _, t := range []string{"t_user_expense", "t_user_expense_school", "t_user_expense_log"} {
		if r.Remaining[t] != 0 {
			zero = false
		}
	}
	fmt.Fprintf(w, "4 张表回 0 行：%s\n", verdict(zero))
}

func verdict(ok bool) string {
	if ok {
		return "PASS"
	}
	return "FAIL"
}

// truncate 按字符截断展示宽度（中文按 2 列宽估算，够用即可）。
func truncate(s string, max int) string {
	r := []rune(s)
	if len(r) <= max {
		return s
	}
	return string(r[:max-1]) + "…"
}