package httpapi

import (
	"context"
	"database/sql"
	"errors"
	"io"
	"log/slog"
	"net/http"
	"path/filepath"
	"strings"
	"testing"

	_ "modernc.org/sqlite"

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

// createEntry / updateEntry 目前没有挂路由，只能在包内直接调用验证。
func newEntryTestServer(t *testing.T) (*server, *sql.DB) {
	t.Helper()
	db, err := sql.Open("sqlite",
		"file:"+filepath.Join(t.TempDir(), "event.db")+"?_pragma=foreign_keys(1)&_pragma=busy_timeout(5000)")
	if err != nil {
		t.Fatalf("打开赛事库: %v", err)
	}
	db.SetMaxOpenConns(1)
	t.Cleanup(func() { _ = db.Close() })
	if err := store.MigrateEvent(db); err != nil {
		t.Fatalf("迁移赛事库: %v", err)
	}
	return &server{ev: db, logger: slog.New(slog.NewTextHandler(io.Discard, nil))}, db
}

type entryFixture struct {
	eventA, eventB int64
	catA, catB     int64
	team           int64
}

func seedEntryFixture(t *testing.T, db *sql.DB) entryFixture {
	t.Helper()
	exec := func(query string, args ...any) int64 {
		res, err := db.Exec(query, args...)
		if err != nil {
			t.Fatalf("执行 SQL 失败: %v\n%s", err, query)
		}
		id, err := res.LastInsertId()
		if err != nil {
			t.Fatalf("取 id 失败: %v", err)
		}
		return id
	}
	sport := exec(`INSERT INTO sports (code, name, sort_order, active) VALUES ('TRACK', '田径', 0, 1)`)
	var f entryFixture
	f.eventA = exec(`INSERT INTO events (sport_id, code, name, status) VALUES (?, 'A100', '甲组100米', 'pending')`, sport)
	f.eventB = exec(`INSERT INTO events (sport_id, code, name, status) VALUES (?, 'B100', '乙组100米', 'pending')`, sport)
	f.catA = exec(`INSERT INTO event_categories (event_id, name, multiplier) VALUES (?, '男子A', 1)`, f.eventA)
	f.catB = exec(`INSERT INTO event_categories (event_id, name, multiplier) VALUES (?, '男子B', 1)`, f.eventB)
	f.team = exec(`INSERT INTO teams (code, name) VALUES ('T1', '第一队')`)
	return f
}

func requireAPIStatus(t *testing.T, err error, status int) *apiError {
	t.Helper()
	if err == nil {
		t.Fatalf("期望错误，得到 nil")
	}
	var api *apiError
	if !errors.As(err, &api) {
		t.Fatalf("期望 *apiError，得到 %T: %v", err, err)
	}
	if api.status != status {
		t.Fatalf("期望状态 %d，得到 %d (%s)", status, api.status, api.message)
	}
	return api
}

func TestNormalizeEntryStatus(t *testing.T) {
	for _, tc := range []struct{ raw, want string }{
		{"", "registered"},
		{"dns", "dns"},
		{"  scratched  ", "scratched"},
	} {
		got, err := normalizeEntryStatus(tc.raw)
		if err != nil || got != tc.want {
			t.Fatalf("normalizeEntryStatus(%q) = %q, %v；期望 %q", tc.raw, got, err, tc.want)
		}
	}

	got, err := normalizeEntryStatus("bogus")
	if got != "" || err == nil {
		t.Fatalf("非法 status 应报错，得到 %q, %v", got, err)
	}
	api := requireAPIStatus(t, err, http.StatusBadRequest)
	if api.code != "VALIDATION_FAILED" {
		t.Fatalf("非法 status 的 code 应是 VALIDATION_FAILED，得到 %q", api.code)
	}
	if !strings.Contains(api.message, "status") {
		t.Fatalf("错误文案应带字段名，得到 %q", api.message)
	}
	if api.detail != "bogus" {
		t.Fatalf("detail 应是原始值，得到 %v", api.detail)
	}
}

func TestCreateEntryRejectsForeignCategory(t *testing.T) {
	s, db := newEntryTestServer(t)
	f := seedEntryFixture(t, db)
	ctx := context.Background()

	_, err := s.createEntry(ctx, entryDTO{EventID: f.eventA, CategoryID: f.catB, TeamID: f.team, Status: "registered"})
	api := requireAPIStatus(t, err, http.StatusBadRequest)
	if api.message != "categoryId 不属于该小项" {
		t.Fatalf("错误文案应是「categoryId 不属于该小项」，得到 %q", api.message)
	}
	if api.detail != f.catB {
		t.Fatalf("detail 应是 categoryId %d，得到 %v", f.catB, api.detail)
	}

	var n int
	if err := db.QueryRow(`SELECT COUNT(*) FROM entries`).Scan(&n); err != nil {
		t.Fatalf("统计报名项: %v", err)
	}
	if n != 0 {
		t.Fatalf("组别不属于小项时不该落库，entries 有 %d 行", n)
	}

	created, err := s.createEntry(ctx, entryDTO{EventID: f.eventA, CategoryID: f.catA, TeamID: f.team, Status: "dq"})
	if err != nil {
		t.Fatalf("同小项组别应创建成功: %v", err)
	}
	if created.CategoryID != f.catA || created.EventID != f.eventA || created.Status != "dq" {
		t.Fatalf("报名项字段不对: %+v", created)
	}
}

func TestCreateEntryRejectsUnknownStatus(t *testing.T) {
	s, db := newEntryTestServer(t)
	f := seedEntryFixture(t, db)

	_, err := s.createEntry(context.Background(),
		entryDTO{EventID: f.eventA, CategoryID: f.catA, TeamID: f.team, Status: "bogus"})
	api := requireAPIStatus(t, err, http.StatusBadRequest)
	if api.code != "VALIDATION_FAILED" || !strings.Contains(api.message, "status") {
		t.Fatalf("非法 status 应 400 VALIDATION_FAILED 且带字段名，得到 %+v", api)
	}
}

func TestUpdateEntryCategoryCheckKeepsNotFound(t *testing.T) {
	s, db := newEntryTestServer(t)
	f := seedEntryFixture(t, db)
	ctx := context.Background()

	created, err := s.createEntry(ctx, entryDTO{EventID: f.eventA, CategoryID: f.catA, TeamID: f.team, Status: "registered"})
	if err != nil {
		t.Fatalf("准备报名项失败: %v", err)
	}

	// 组别必须属于该报名项所在小项（updateEntry 不改 event_id）。
	_, err = s.updateEntry(ctx, created.ID, entryDTO{CategoryID: f.catB, TeamID: f.team, Status: "registered"})
	api := requireAPIStatus(t, err, http.StatusBadRequest)
	if api.message != "categoryId 不属于该小项" || api.detail != f.catB {
		t.Fatalf("非法组别应被拦下，得到 %+v", api)
	}

	updated, err := s.updateEntry(ctx, created.ID, entryDTO{CategoryID: f.catA, TeamID: f.team, Status: "scratched"})
	if err != nil {
		t.Fatalf("同小项组别应更新成功: %v", err)
	}
	if updated.CategoryID != f.catA || updated.Status != "scratched" {
		t.Fatalf("更新结果不对: %+v", updated)
	}

	// 报名项不存在仍是 404，不能被组别校验降级成 400。
	_, err = s.updateEntry(ctx, created.ID+9999, entryDTO{CategoryID: f.catA, TeamID: f.team, Status: "registered"})
	api = requireAPIStatus(t, err, http.StatusNotFound)
	if api.message != "报名项不存在" {
		t.Fatalf("不存在的报名项应 404「报名项不存在」，得到 %+v", api)
	}
}