package rules

import (
	"errors"
	"reflect"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Scoreboard/server/internal/domain"
)

// 测试一律用内联 YAML，不读 rules/ 目录（该目录含敏感信息且不进版本库）。
const validPackYAML = `format: scoreboard-rules
formatVersion: 1
meta:
  code: demo-rules
  name: 示例规则包
  version: 1.0.0
  updatedAt: "2026-01-01"
  author: tester
standings:
  individualToTeamWeight: 1
  tieBreak: [points, gold, silver, bronze, teamCode]
  medalCountsTeamEvents: true
  showIndividualBoard: true
  showIndividualMedals: true
profiles:
  - code: individual_top6
    name: 个人项目前六名
    awardRanks: 6
    lastPlaceZero: false
    tieMode: skip
    rules:
      - { rank: 1, points: 10 }
      - { rank: 2, points: 8 }
      - { rank: 3, points: 6 }
      - { rank: 4, points: 3 }
      - { rank: 5, points: 2 }
      - { rank: 6, points: 1 }
  - code: team_top6
    name: 团体项目前六名
    awardRanks: 2
    tieMode: average
    rules:
      - { rank: 1, points: 15 }
      - { rank: 2, points: 10 }
recordBonus:
  enabled: false
  mode: max
  levels:
    - { code: meet, name: 赛会纪录, points: 2 }
manualAdjustment:
  enabled: false
  reasonRequired: true
channelTemplates:
  - match: { eventType: individual }
    channels:
      - { scope: athlete, basis: result, profile: individual_top6 }
  - match: { eventType: team }
    channels:
      - { scope: team, basis: manual, profile: team_top6 }
eventOverrides:
  - eventCode: EVT_DEMO
    name: 示例项目
    channels:
      - { scope: athlete, basis: result, profile: individual_top6 }
      - { scope: team, basis: manual, profile: team_top6 }
  - eventCode: EVT_NOSCORE
    name: 只排名不计分
    scored: false
`

const minimalPackYAML = `format: scoreboard-rules
formatVersion: 1
meta: { code: demo, name: 示例 }
profiles:
  - { code: p1, name: 模板一, awardRanks: 1, tieMode: skip, rules: [ { rank: 1, points: 1 } ] }
`

func TestParseValidPack(t *testing.T) {
	pack, err := Parse([]byte(validPackYAML))
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}

	if pack.Format != FormatName || pack.FormatVersion != FormatVersion {
		t.Fatalf("格式字段解析错误: %+v", pack)
	}
	if pack.Meta.Code != "demo-rules" || pack.Meta.Name != "示例规则包" {
		t.Errorf("meta 解析错误: %+v", pack.Meta)
	}
	if len(pack.Profiles) != 2 {
		t.Fatalf("模板数量 = %d，期望 2", len(pack.Profiles))
	}
	if got := pack.Profiles[0].Rules[0]; got != (Rule{Rank: 1, Points: 10}) {
		t.Errorf("名次 1 分值 = %+v，期望 10", got)
	}
	if pack.Profiles[0].TieMode != domain.TieSkip || pack.Profiles[1].TieMode != domain.TieAverage {
		t.Errorf("并列口径解析错误: %q / %q", pack.Profiles[0].TieMode, pack.Profiles[1].TieMode)
	}
	// 未配置 recordBonusMode 时按 max 补齐（与 domain 默认一致）。
	if pack.Profiles[0].RecordBonusMode != domain.RecordBonusMax {
		t.Errorf("recordBonusMode 缺省值 = %q，期望 max", pack.Profiles[0].RecordBonusMode)
	}
	if len(pack.ChannelTemplates) != 2 || len(pack.EventOverrides) != 2 {
		t.Errorf("通道模板/项目例外数量错误: %d / %d", len(pack.ChannelTemplates), len(pack.EventOverrides))
	}
	if pack.EventOverrides[1].Scored == nil || *pack.EventOverrides[1].Scored {
		t.Errorf("EVT_NOSCORE 的 scored 应为 false: %+v", pack.EventOverrides[1].Scored)
	}
	if !pack.Standings.MedalCountsTeamEventsEnabled() || !pack.Standings.ShowIndividualBoardEnabled() {
		t.Error("榜单开关缺省值应为 true")
	}
}

func TestParseFillsDefaults(t *testing.T) {
	pack, err := Parse([]byte(minimalPackYAML))
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if pack.Standings.IndividualToTeamWeight != 1 {
		t.Errorf("未配置权重时应补 1，实际 %v", pack.Standings.IndividualToTeamWeight)
	}
	if !reflect.DeepEqual(pack.Standings.TieBreak, DefaultTieBreak) {
		t.Errorf("未配置 tieBreak 时应补默认值，实际 %v", pack.Standings.TieBreak)
	}
	if pack.RecordBonus.Mode != domain.RecordBonusMax {
		t.Errorf("未配置 recordBonus.mode 时应补 max，实际 %q", pack.RecordBonus.Mode)
	}
}

func TestMarshalRoundTripStable(t *testing.T) {
	pack, err := Parse([]byte(validPackYAML))
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}

	first, err := Marshal(pack)
	if err != nil {
		t.Fatalf("Marshal: %v", err)
	}
	if !strings.HasPrefix(string(first), "# 积分规则包") {
		t.Errorf("导出缺少注释头:\n%s", first)
	}

	again, err := Parse(first)
	if err != nil {
		t.Fatalf("重新 Parse 导出结果: %v", err)
	}
	second, err := Marshal(again)
	if err != nil {
		t.Fatalf("再次 Marshal: %v", err)
	}
	if string(first) != string(second) {
		t.Errorf("往返序列化不稳定:\n--- 第一次 ---\n%s\n--- 第二次 ---\n%s", first, second)
	}
	if !reflect.DeepEqual(pack, again) {
		t.Errorf("往返后规则包内容不一致:\n%+v\n%+v", pack, again)
	}
}

func TestParseRejectsBadInput(t *testing.T) {
	cases := []struct {
		name     string
		yaml     string
		sentinel error
	}{
		{"空文件", "   \n", ErrNotRulePack},
		{"格式标识不符", strings.Replace(validPackYAML, "format: scoreboard-rules", "format: something-else", 1), ErrNotRulePack},
		{"版本不兼容", strings.Replace(validPackYAML, "formatVersion: 1", "formatVersion: 2", 1), ErrIncompatibleVersion},
		{"未知字段", validPackYAML + "\nbogusField: 1\n", nil},
		{"缺 meta.code", strings.Replace(validPackYAML, "  code: demo-rules\n", "", 1), ErrValidation},
		{"缺 meta.name", strings.Replace(validPackYAML, "  name: 示例规则包\n", "", 1), ErrValidation},
		{"模板编码重复", strings.Replace(validPackYAML, "  - code: team_top6", "  - code: individual_top6", 1), ErrValidation},
		{"录取名次为负", strings.Replace(validPackYAML, "awardRanks: 6", "awardRanks: -1", 1), ErrValidation},
		{"并列口径非法", strings.Replace(validPackYAML, "tieMode: skip", "tieMode: random", 1), ErrValidation},
		{"分值非负", strings.Replace(validPackYAML, "      - { rank: 1, points: 10 }", "      - { rank: 1, points: -10 }", 1), ErrValidation},
		{"名次重复", strings.Replace(validPackYAML, "      - { rank: 2, points: 8 }", "      - { rank: 1, points: 8 }", 1), ErrValidation},
		{"通道 scope 非法", strings.Replace(validPackYAML, "{ scope: athlete, basis: result, profile: individual_top6 }", "{ scope: unit, basis: result, profile: individual_top6 }", 1), ErrValidation},
		{"通道 basis 非法", strings.Replace(validPackYAML, "{ scope: team, basis: manual, profile: team_top6 }", "{ scope: team, basis: guess, profile: team_top6 }", 1), ErrValidation},
		{"通道引用不存在的模板", strings.Replace(validPackYAML, "profile: individual_top6 }", "profile: ghost_top6 }", 1), ErrValidation},
		{"排序键未知", strings.Replace(validPackYAML, "tieBreak: [points, gold, silver, bronze, teamCode]", "tieBreak: [points, platinum]", 1), ErrValidation},
		{"启用破纪录却没有档位", strings.Replace(validPackYAML, "recordBonus:\n  enabled: false\n  mode: max\n  levels:\n    - { code: meet, name: 赛会纪录, points: 2 }", "recordBonus:\n  enabled: true\n  mode: max\n  levels: []", 1), ErrValidation},
		// aggregate 的汇总口径（avg/max/min/count）没有落库列，已从类型里移除；写了必须报错而不是静默丢弃。
		{"通道 aggregate 口径已移除", strings.Replace(validPackYAML, "{ scope: team, basis: manual, profile: team_top6 }", "{ scope: team, basis: aggregate, profile: team_top6, aggregate: avg }", 1), nil},
		// 联队归属未实现，规则包里不允许出现相关配置。
		{"联队归属未实现", strings.Replace(validPackYAML, "standings:\n", "standings:\n  unionAttribution: split\n", 1), nil},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			_, err := Parse([]byte(tc.yaml))
			if err == nil {
				t.Fatal("期望报错，实际解析成功")
			}
			if tc.sentinel != nil && !errors.Is(err, tc.sentinel) {
				t.Fatalf("期望 %v，实际 %v", tc.sentinel, err)
			}
			if tc.sentinel == nil && errors.Is(err, ErrIncompatibleVersion) {
				t.Fatalf("未知字段不应报版本错误: %v", err)
			}
		})
	}
}

func TestParseRejectsStructuralProblems(t *testing.T) {
	cases := map[string]string{
		"没有模板": `format: scoreboard-rules
formatVersion: 1
meta: { code: demo, name: 示例 }
profiles: []
`,
		"模板没有通道": `format: scoreboard-rules
formatVersion: 1
meta: { code: demo, name: 示例 }
profiles:
  - { code: p1, name: 模板一, awardRanks: 1, tieMode: skip, rules: [ { rank: 1, points: 1 } ] }
channelTemplates:
  - match: { eventType: team }
    channels: []
`,
		"模板匹配条件为空": `format: scoreboard-rules
formatVersion: 1
meta: { code: demo, name: 示例 }
profiles:
  - { code: p1, name: 模板一, awardRanks: 1, tieMode: skip, rules: [ { rank: 1, points: 1 } ] }
channelTemplates:
  - match: {}
    channels:
      - { scope: team, basis: manual, profile: p1 }
`,
		"同一项目通道重复": `format: scoreboard-rules
formatVersion: 1
meta: { code: demo, name: 示例 }
profiles:
  - { code: p1, name: 模板一, awardRanks: 1, tieMode: skip, rules: [ { rank: 1, points: 1 } ] }
eventOverrides:
  - eventCode: EVT_X
    channels:
      - { scope: team, basis: manual, profile: p1 }
      - { scope: team, basis: manual, profile: p1 }
`,
	}
	for name, yaml := range cases {
		t.Run(name, func(t *testing.T) {
			if _, err := Parse([]byte(yaml)); !errors.Is(err, ErrValidation) {
				t.Fatalf("期望 ErrValidation，实际 %v", err)
			}
		})
	}
}

func TestParseRejectsMultipleDocuments(t *testing.T) {
	if _, err := Parse([]byte(validPackYAML + "---\nformat: scoreboard-rules\n")); !errors.Is(err, ErrNotRulePack) {
		t.Fatalf("多文档应报 ErrNotRulePack，实际 %v", err)
	}
}

func TestProfileDomainConversion(t *testing.T) {
	pack, err := Parse([]byte(validPackYAML))
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}

	dp := pack.Profiles[0].ToDomain(7)
	if dp.ID != 7 || dp.Code != "individual_top6" || dp.TieMode != domain.TieSkip {
		t.Errorf("ToDomain 结果错误: %+v", dp)
	}
	if len(dp.Rules) != 6 || dp.Rules[0] != (domain.ScoringRule{Rank: 1, Points: 10}) {
		t.Errorf("ToDomain 明细错误: %+v", dp.Rules)
	}

	ch := pack.ChannelTemplates[0].Channels[0].ToDomain(3, 7, 0)
	if ch.EventID != 3 || ch.ProfileID != 7 || ch.Scope != domain.ScopeAthlete || ch.Basis != domain.BasisResult {
		t.Errorf("通道 ToDomain 结果错误: %+v", ch)
	}

	rb := pack.RecordBonus.ToDomain()
	if rb.Enabled || rb.Mode != domain.RecordBonusMax || len(rb.Levels) != 1 {
		t.Errorf("破纪录配置转换错误: %+v", rb)
	}
}

// TestRecordBonusFromSettings 验证上层能从 settings 键值对读到破纪录档位：
// 只读 enabled/mode 而不读 levels，会让破纪录加分永远算 0。
func TestRecordBonusFromSettings(t *testing.T) {
	settings := map[string]string{
		settingRecordBonusEnabled: "true",
		settingRecordBonusMode:    "sum",
		settingRecordBonusLevels:  `[{"code":"meet","name":"赛会纪录","points":2},{"code":"city","name":"市级纪录","points":5}]`,
	}
	cfg := RecordBonusFromSettings(settings)
	if !cfg.Enabled || cfg.Mode != domain.RecordBonusSum {
		t.Fatalf("开关/口径错误: %+v", cfg)
	}
	if len(cfg.Levels) != 2 {
		t.Fatalf("档位数 = %d，期望 2（levels 必须被解析）", len(cfg.Levels))
	}
	if cfg.Levels[1].Code != "city" || cfg.Levels[1].Points != 5 {
		t.Fatalf("档位内容错误: %+v", cfg.Levels[1])
	}

	t.Run("缺省值", func(t *testing.T) {
		cfg := RecordBonusFromSettings(map[string]string{})
		if cfg.Enabled || cfg.Mode != domain.RecordBonusMax || len(cfg.Levels) != 0 {
			t.Fatalf("缺省配置错误: %+v", cfg)
		}
	})
}

// TestRecordBonusSettingsRoundTrip 验证规则包写入 settings 后还能原样读回档位。
func TestRecordBonusSettingsRoundTrip(t *testing.T) {
	pack, err := Parse([]byte(validPackYAML))
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}
	got := RecordBonusFromSettings(settingsFromPack(pack))
	want := pack.RecordBonus.ToDomain()
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("settings 往返后破纪录配置不一致:\n%+v\n%+v", got, want)
	}
}