package revisions_test

import (
	"context"
	"database/sql"
	"encoding/json"
	"testing"

	_ "modernc.org/sqlite"

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

// 一版快照里的成绩，字段名与 httpapi.resultDTO 的 JSON 对齐（只列判定用得到的）。
type snapResult struct {
	EntryID     int64    `json:"entryId"`
	Rank        *int     `json:"rank"`
	ResultText  string   `json:"resultText"`
	ResultValue *float64 `json:"resultValue"`
	Unit        string   `json:"unit"`
	IsTie       bool     `json:"isTie"`
	Status      string   `json:"status"`
	State       string   `json:"state"`
	Note        *string  `json:"note"`
}

type revision struct {
	eventID int64
	message string
	actorID any
	created string
	results []snapResult
}

func newDB(t *testing.T, rows []revision) *sql.DB {
	t.Helper()
	db, err := sql.Open("sqlite", "file::memory:?cache=shared")
	if err != nil {
		t.Fatalf("打开内存库: %v", err)
	}
	t.Cleanup(func() { _ = db.Close() })
	if _, err := db.Exec(`CREATE TABLE result_revisions (
		id INTEGER PRIMARY KEY AUTOINCREMENT, event_id INTEGER NOT NULL, action TEXT NOT NULL,
		snapshot_json TEXT NOT NULL, actor_id INTEGER, message TEXT, created_at TEXT NOT NULL)`); err != nil {
		t.Fatalf("建表: %v", err)
	}
	for _, row := range rows {
		raw, err := json.Marshal(row.results)
		if err != nil {
			t.Fatalf("序列化快照: %v", err)
		}
		if _, err := db.Exec(`INSERT INTO result_revisions (event_id, action, snapshot_json, actor_id, message, created_at)
			VALUES (?, 'publish', ?, ?, ?, ?)`, row.eventID, string(raw), row.actorID, row.message, row.created); err != nil {
			t.Fatalf("插入修订: %v", err)
		}
	}
	return db
}

func f64(v float64) *float64 { return &v }
func str(v string) *string   { return &v }

// result 造一条成绩快照；名次与 state 每次都不同，用来证明它们不参与判定。
func result(entryID int64, rank int, text string, value float64, state string) snapResult {
	return snapResult{
		EntryID: entryID, Rank: &rank, ResultText: text, ResultValue: f64(value),
		Unit: "s", Status: "ok", State: state,
	}
}

func load(t *testing.T, db *sql.DB, keys ...revisions.Key) map[revisions.Key]revisions.Trail {
	t.Helper()
	trails, err := revisions.Load(context.Background(), db, keys)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	return trails
}

// 发布 → 改成绩 → 重新发布：能读出「改过 1 次」、最后一次的时间与原因。
func TestLoadCountsRepublishAfterEdit(t *testing.T) {
	db := newDB(t, []revision{
		{eventID: 1, created: "2026-09-13 02:40:00", results: []snapResult{
			result(11, 1, "11.58", 11.58, "published"),
			result(12, 2, "11.92", 11.92, "published"),
		}},
		{eventID: 1, created: "2026-09-13 02:50:00", results: []snapResult{
			// 退回草稿：只有 state 变，成绩一个字没动。
			result(11, 1, "11.58", 11.58, "draft"),
			result(12, 2, "11.92", 11.92, "published"),
		}},
		{eventID: 1, message: "", actorID: 7, created: "2026-09-13 02:58:00", results: []snapResult{
			result(11, 1, "11.42", 11.42, "published"),
			result(12, 3, "11.92", 11.92, "published"),
		}},
	})

	trails := load(t, db, revisions.Key{EventID: 1, EntryID: 11}, revisions.Key{EventID: 1, EntryID: 12})
	got := trails[revisions.Key{EventID: 1, EntryID: 11}]
	if got.Count != 1 {
		t.Fatalf("11 号成绩改过 1 次，得到 %d", got.Count)
	}
	if got.At != "2026-09-13 02:58:00" {
		t.Fatalf("最后一次修订时间 = %q", got.At)
	}
	// 12 号成绩一个字没改，只有名次被引擎重算（2 → 3）：不能算修订。
	if other, ok := trails[revisions.Key{EventID: 1, EntryID: 12}]; !ok || other.Count != 0 {
		t.Fatalf("没改过的成绩不该报修订，得到 %+v（存在=%v）", other, ok)
	}
}

// 原因优先取这条成绩自己的备注（「退回草稿」写下的理由），修订行的 message 只作兜底。
func TestLoadPrefersResultNoteAsReason(t *testing.T) {
	db := newDB(t, []revision{
		{eventID: 1, created: "2026-09-13 02:40:00", results: []snapResult{
			result(11, 1, "11.58", 11.58, "published"),
		}},
		{eventID: 1, message: "跳过 3 条只填了成绩文本的草稿", actorID: 7, created: "2026-09-13 02:58:00",
			results: []snapResult{func() snapResult {
				r := result(11, 1, "11.42", 11.42, "published")
				r.Note = str("成绩录入笔误")
				return r
			}()}},
	})
	got := load(t, db, revisions.Key{EventID: 1, EntryID: 11})[revisions.Key{EventID: 1, EntryID: 11}]
	if got.Reason != "成绩录入笔误" {
		t.Fatalf("原因应取成绩备注，得到 %q", got.Reason)
	}
	if got.ActorID == nil || *got.ActorID != 7 {
		t.Fatalf("操作人 = %v，期望 7", got.ActorID)
	}
}

// 没有备注时退回修订行的 message；两者都没有就是空串（调用方只显示时间，不编原因）。
func TestLoadReasonFallsBackToMessageThenEmpty(t *testing.T) {
	db := newDB(t, []revision{
		{eventID: 1, created: "2026-09-13 02:40:00", results: []snapResult{result(11, 1, "11.58", 11.58, "published")}},
		{eventID: 1, message: "现场复核后更正", created: "2026-09-13 02:58:00",
			results: []snapResult{result(11, 1, "11.42", 11.42, "published")}},
		{eventID: 1, created: "2026-09-13 03:10:00", results: []snapResult{result(11, 1, "11.30", 11.30, "published")}},
	})
	got := load(t, db, revisions.Key{EventID: 1, EntryID: 11})[revisions.Key{EventID: 1, EntryID: 11}]
	if got.Count != 2 {
		t.Fatalf("改了两次应报 2，得到 %d", got.Count)
	}
	if got.Reason != "" {
		t.Fatalf("最后一次没写原因就应留空，得到 %q", got.Reason)
	}
	if got.At != "2026-09-13 03:10:00" {
		t.Fatalf("最后一次修订时间 = %q", got.At)
	}
}

// 一次都没在版本链里出现过（没有基线）时不返回该 Key —— 调用方据此显示为空，而不是 0。
func TestLoadOmitsKeysWithoutBaseline(t *testing.T) {
	db := newDB(t, []revision{
		{eventID: 1, created: "2026-09-13 02:40:00", results: []snapResult{result(11, 1, "11.58", 11.58, "published")}},
	})
	trails := load(t, db, revisions.Key{EventID: 1, EntryID: 11}, revisions.Key{EventID: 1, EntryID: 99},
		revisions.Key{EventID: 2, EntryID: 11})
	if _, ok := trails[revisions.Key{EventID: 1, EntryID: 99}]; ok {
		t.Fatalf("没出现在任何快照里的成绩不该有痕迹")
	}
	if _, ok := trails[revisions.Key{EventID: 2, EntryID: 11}]; ok {
		t.Fatalf("别的项目下的同号报名项不该被认成同一条成绩")
	}
	if got := trails[revisions.Key{EventID: 1, EntryID: 11}]; got.Count != 0 {
		t.Fatalf("只发布过一次的成绩应追溯得到、且没改过，得到 %+v", got)
	}
}

// 「作废 / 改判」改的是状态不是成绩文本：也算改过（否则现场看不出这格被改判过）。
func TestLoadCountsStatusChange(t *testing.T) {
	db := newDB(t, []revision{
		{eventID: 1, created: "2026-09-13 02:40:00", results: []snapResult{result(11, 1, "11.58", 11.58, "published")}},
		{eventID: 1, created: "2026-09-13 03:00:00", results: []snapResult{func() snapResult {
			r := result(11, 1, "11.58", 11.58, "published")
			r.Status = "dq"
			return r
		}()}},
	})
	if got := load(t, db, revisions.Key{EventID: 1, EntryID: 11})[revisions.Key{EventID: 1, EntryID: 11}]; got.Count != 1 {
		t.Fatalf("改判（状态变化）应算改过 1 次，得到 %+v", got)
	}
}

// 同一条成绩的小项下别的成绩反复改，不能把它的修订次数带上去。
func TestLoadKeepsEventsApart(t *testing.T) {
	db := newDB(t, []revision{
		{eventID: 1, created: "2026-09-13 02:40:00", results: []snapResult{
			result(11, 1, "11.58", 11.58, "published"), result(21, 1, "22.10", 22.10, "published"),
		}},
		{eventID: 1, created: "2026-09-13 03:00:00", results: []snapResult{
			result(11, 1, "11.58", 11.58, "published"), result(21, 1, "21.80", 21.80, "published"),
		}},
		{eventID: 2, created: "2026-09-13 03:10:00", results: []snapResult{result(11, 1, "11.42", 11.42, "published")}},
	})
	trails := load(t, db, revisions.Key{EventID: 1, EntryID: 11}, revisions.Key{EventID: 1, EntryID: 21},
		revisions.Key{EventID: 2, EntryID: 11})
	if got := trails[revisions.Key{EventID: 1, EntryID: 11}].Count; got != 0 {
		t.Fatalf("同一小项里别人改了，自己不算改过，得到 %d", got)
	}
	if got := trails[revisions.Key{EventID: 1, EntryID: 21}].Count; got != 1 {
		t.Fatalf("真正改了的那条应报 1，得到 %d", got)
	}
	if got := trails[revisions.Key{EventID: 2, EntryID: 11}].Count; got != 0 {
		t.Fatalf("另一个小项里的同号报名项不该受牵连，得到 %d", got)
	}
}

// 破纪录加分 / 人工调整 / 聚合流水没有「一条成绩」可追：KeyFor 不给它们身份，
// 免得把成绩的修订说成「那笔加分被改过」。
func TestKeyForOnlyAcceptsScoreLedger(t *testing.T) {
	if got := revisions.KeyFor("record_bonus", 1, 11); got != (revisions.Key{}) {
		t.Fatalf("破纪录加分不该挂成绩的修订痕迹，得到 %+v", got)
	}
	if got := revisions.KeyFor("adjustment", 1, 11); got != (revisions.Key{}) {
		t.Fatalf("人工调整不该挂成绩的修订痕迹，得到 %+v", got)
	}
	if got := revisions.KeyFor("result", 0, 11); got != (revisions.Key{}) {
		t.Fatalf("没有小项的流水追不了，得到 %+v", got)
	}
	if got := revisions.KeyFor("result", 1, 0); got != (revisions.Key{}) {
		t.Fatalf("聚合流水没有报名项，追不了，得到 %+v", got)
	}
	if got := revisions.KeyFor("result", 1, 11); got != (revisions.Key{EventID: 1, EntryID: 11}) {
		t.Fatalf("成绩流水应给出身份，得到 %+v", got)
	}
}