package services

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

	"fwh-toolbox-server/domain"
	"fwh-toolbox-server/dto"
	"fwh-toolbox-server/repositories"

	"go.mongodb.org/mongo-driver/bson/primitive"
)

func TestDiscoverFaultDevicesUsesCurrentScope(t *testing.T) {
	original := repositories.QuerySiteBaseInfoList
	t.Cleanup(func() { repositories.QuerySiteBaseInfoList = original })
	repositories.QuerySiteBaseInfoList = func(_ dto.SiteBaseInfoPara) (*domain.FwhResponse[[]dto.SiteBaseInfo], error) {
		devices := []dto.SiteBaseInfo{{Id: "GATE-1", FhpSn: "POWER-1,POWER-2"}}
		return &domain.FwhResponse[[]dto.SiteBaseInfo]{Code: 200, Result: &devices}, nil
	}
	devices, err := discoverDataDownloadFaultDevices("GATE-1")
	if err != nil {
		t.Fatal(err)
	}
	if len(devices) != 3 || devices[0].Type != 0 || devices[1].Type != 0 || devices[2].Type != 1 {
		t.Fatalf("unexpected fault devices: %+v", devices)
	}
}

func TestDataDownloadLocationFixedOffset(t *testing.T) {
	loc := dataDownloadLocation("UTC-07.50")
	_, offset := time.Date(2026, 1, 1, 0, 0, 0, 0, loc).Zone()
	if offset != -7*3600-30*60 {
		t.Fatalf("offset = %d", offset)
	}
}

func TestDataDownloadEventAlarmTable(t *testing.T) {
	headers, rows := dataDownloadTable(domain.DataDownloadEventAlarm, []json.RawMessage{json.RawMessage(`{"id":null,"logTime":"2026-09-19 10:00:00","logType":"1","alarmCode":"A1","logName":"Alarm","startTime":"2026-09-19 09:59:00","endTime":null,"logData":"{}"}`)})
	if len(headers) != 8 || headers[7] != "Data" {
		t.Fatalf("unexpected headers: %#v", headers)
	}
	if rows[0][0] != "1" || rows[0][6] != "null" {
		t.Fatalf("unexpected event row: %#v", rows[0])
	}
}

func TestSupportedRenderFormats(t *testing.T) {
	if !supportedRenderFormat(domain.DataDownloadPowerFlow, "html") {
		t.Fatal("power flow HTML should be supported")
	}
	if supportedRenderFormat(domain.DataDownloadPowerFlow, "xlsx") {
		t.Fatal("power flow XLSX should not be supported")
	}
	if !supportedRenderFormat(domain.DataDownloadMqttLog, "csv") {
		t.Fatal("MQTT CSV should be supported")
	}
	if supportedRenderFormat(domain.DataDownloadUpdateLog, "csv") {
		t.Fatal("update CSV should not be supported")
	}
}

func TestCleanZipPath(t *testing.T) {
	if got := cleanZipPath("../../outside"); got != "outside" {
		t.Fatalf("unsafe path normalized to %q", got)
	}
}

func TestBuildDataDownloadRequestKeyByKind(t *testing.T) {
	tests := []struct {
		name string
		item domain.DataDownloadItem
		want string
	}{
		{
			name: "power flow includes timezone",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadPowerFlow, SiteSN: "SN001", Date: "2026-09-10", Timezone: "America/Los_Angeles"},
			want: "dd-request-v1|kind=power_flow|content_version=v1|site_sn=SN001|date=2026-09-10|timezone=America%2FLos_Angeles",
		},
		{
			name: "mqtt includes subtype and timezone",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadMqttLog, SiteSN: "SN001", Date: "2026-09-10", Subtype: "201", Timezone: "America/Los_Angeles"},
			want: "dd-request-v1|kind=mqtt_log|content_version=v1|site_sn=SN001|date=2026-09-10|subtype=201|timezone=America%2FLos_Angeles",
		},
		{
			name: "event alarm includes timezone",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadEventAlarm, SiteSN: "SN001", Date: "2026-09-10", Timezone: "America/Los_Angeles"},
			want: "dd-request-v1|kind=event_alarm|content_version=v1|site_sn=SN001|date=2026-09-10|timezone=America%2FLos_Angeles",
		},
		{
			name: "alarm snapshot includes timezone",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadAlarmSnapshot, SiteSN: "SN001", Date: "2026-09-10", Timezone: "America/Los_Angeles"},
			want: "dd-request-v1|kind=alarm_snapshot|content_version=v1|site_sn=SN001|date=2026-09-10|timezone=America%2FLos_Angeles",
		},
		{
			name: "EMS ignores timezone",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadEmsLog, SiteSN: "SN001", Date: "2026-09-10", Subtype: "2", Timezone: "America/Los_Angeles"},
			want: "dd-request-v1|kind=ems_log|content_version=v1|site_sn=SN001|date=2026-09-10|subtype=2",
		},
		{
			name: "device scoped fault record",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadFaultRecord, SiteSN: "SN001", DeviceSN: "DEV001", DeviceType: "aPower", Date: "2026-09-10", Timezone: "UTC-07.00"},
			want: "dd-request-v1|kind=fault_record|content_version=v2|device_sn=DEV001|device_type=aPower|date=2026-09-10|timezone=UTC-07.00",
		},
		{
			name: "update log ignores date subtype and timezone",
			item: domain.DataDownloadItem{Kind: domain.DataDownloadUpdateLog, SiteSN: "SN001", Date: "2026-09-10", Subtype: "unused", Timezone: "America/Los_Angeles"},
			want: "dd-request-v1|kind=update_log|content_version=v1|site_sn=SN001",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := buildDataDownloadRequestKey(&tt.item)
			if err != nil {
				t.Fatal(err)
			}
			if got != tt.want {
				t.Fatalf("request key = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestBuildDataDownloadRequestKeyIdentityStability(t *testing.T) {
	base := domain.DataDownloadItem{
		TaskID:   primitive.NewObjectID(),
		ItemKey:  "task-item-a",
		Kind:     domain.DataDownloadMqttLog,
		SiteSN:   "SN|001",
		Date:     "2026-09-10",
		Subtype:  "cmd=201",
		Timezone: "America/Los_Angeles",
	}
	want, err := buildDataDownloadRequestKey(&base)
	if err != nil {
		t.Fatal(err)
	}

	changedTaskFields := base
	changedTaskFields.TaskID = primitive.NewObjectID()
	changedTaskFields.ItemKey = "task-item-b"
	got, err := buildDataDownloadRequestKey(&changedTaskFields)
	if err != nil {
		t.Fatal(err)
	}
	if got != want {
		t.Fatalf("task-only fields changed request identity: %q != %q", got, want)
	}

	changedContent := base
	changedContent.Timezone = "Asia/Shanghai"
	got, err = buildDataDownloadRequestKey(&changedContent)
	if err != nil {
		t.Fatal(err)
	}
	if got == want {
		t.Fatal("content-affecting timezone did not change request identity")
	}
	if !strings.Contains(want, "site_sn=SN%7C001") || !strings.Contains(want, "subtype=cmd%3D201") {
		t.Fatalf("request key fields were not safely escaped: %q", want)
	}
}

func TestBuildDataDownloadRequestKeyRejectsInvalidIdentity(t *testing.T) {
	tests := []domain.DataDownloadItem{
		{Kind: "unknown", SiteSN: "SN001"},
		{Kind: domain.DataDownloadMqttLog, SiteSN: "SN001", Date: "2026-09-10", Timezone: "UTC"},
		{Kind: domain.DataDownloadPowerFlow, SiteSN: "SN001", Date: "not-a-date", Timezone: "UTC"},
		{Kind: domain.DataDownloadFaultRecord, SiteSN: "SN001", DeviceSN: "DEV001", Date: "2026-09-10", Timezone: "UTC"},
	}
	for i := range tests {
		if _, err := buildDataDownloadRequestKey(&tests[i]); err == nil {
			t.Fatalf("case %d: expected invalid identity error", i)
		}
	}
}

func TestDataDownloadFaultRecordDeviceSN(t *testing.T) {
	aPower, mppt, aHub := "AP-1", "MPPT-1", "HUB-1"
	tests := []struct {
		record domain.FaultRecordInfo
		want   string
	}{
		{record: domain.FaultRecordInfo{DeviceType: 0, ApowerId: &aPower}, want: aPower},
		{record: domain.FaultRecordInfo{DeviceType: 1, GatewayId: "GATE-1"}, want: "GATE-1"},
		{record: domain.FaultRecordInfo{DeviceType: 2, ApowerId: &mppt}, want: mppt},
		{record: domain.FaultRecordInfo{DeviceType: 3, PowerlinkId: &aHub}, want: aHub},
	}
	for _, tt := range tests {
		got, err := dataDownloadFaultRecordDeviceSN(tt.record)
		if err != nil {
			t.Fatal(err)
		}
		if got != tt.want {
			t.Fatalf("device SN = %q, want %q", got, tt.want)
		}
	}
	if _, err := dataDownloadFaultRecordDeviceSN(domain.FaultRecordInfo{DeviceType: 4}); err == nil {
		t.Fatal("future device types must require an explicit identity rule")
	}
}

func TestFaultRecordDocumentStateDPlusTwo(t *testing.T) {
	loc := time.FixedZone("UTC-7", -7*60*60)
	day := time.Date(2026, 9, 10, 0, 0, 0, 0, loc)
	before := time.Date(2026, 9, 11, 23, 59, 59, 0, loc)
	atBoundary := time.Date(2026, 9, 12, 0, 0, 0, 0, loc)
	if state, frozenAt := faultRecordDocumentState(before, loc, day, 0); state != domain.DataDownloadMutable || frozenAt != nil {
		t.Fatalf("before D+2 = %s, %v", state, frozenAt)
	}
	if state, frozenAt := faultRecordDocumentState(atBoundary, loc, day, 0); state != domain.DataDownloadFrozen || frozenAt == nil {
		t.Fatalf("at D+2 = %s, %v", state, frozenAt)
	}
	if state, frozenAt := faultRecordDocumentState(atBoundary, loc, day, 1); state != domain.DataDownloadMutable || frozenAt != nil {
		t.Fatalf("failed D+2 request = %s, %v", state, frozenAt)
	}
}

// TestStripTimeLocation 锁定 OOM 根因修复：把带时区的时间剥离为同字面值的 UTC。
func TestStripTimeLocation(t *testing.T) {
	chicago, err := time.LoadLocation("America/Chicago")
	if err != nil {
		t.Skipf("时区数据不可用: %v", err)
	}

	// 复现 DataDownload 的入参：本地时区解析出的当日起止。
	start := time.Date(2026, 9, 19, 0, 0, 0, 0, chicago)
	end := start.AddDate(0, 0, 1).Add(-time.Nanosecond)

	startQuery := stripTimeLocation(start)
	endQuery := stripTimeLocation(end)

	// 剥离后必须为 UTC，且字面 年/月/日/时/分/秒 与原值一致。
	if startQuery.Location() != time.UTC || endQuery.Location() != time.UTC {
		t.Fatalf("剥离后应为 UTC: start=%v end=%v", startQuery.Location(), endQuery.Location())
	}
	if startQuery.Year() != 2026 || startQuery.Month() != 9 || startQuery.Day() != 19 ||
		startQuery.Hour() != 0 || startQuery.Minute() != 0 || startQuery.Second() != 0 {
		t.Fatalf("start 字面值被改变: %v", startQuery)
	}

	// 关键回归点：用剥离后的 UTC 起点走上游同款两步游标推进（Truncate 按 UTC 对齐 + time.Date 归零），
	// 下一天游标必须严格前进到 09-20，而不是回退到当天导致死循环。
	dayEnd := time.Date(startQuery.Year(), startQuery.Month(), startQuery.Day(), 23, 59, 59, 0, startQuery.Location())
	truncated := dayEnd.Add(time.Second).Truncate(24 * time.Hour)
	next := time.Date(truncated.Year(), truncated.Month(), truncated.Day(), 0, 0, 0, 0, truncated.Location())
	if !next.After(startQuery) {
		t.Fatalf("游标未前进(会死循环): start=%v next=%v", startQuery, next)
	}
	if next.Year() != 2026 || next.Month() != 9 || next.Day() != 20 {
		t.Fatalf("游标应前进到 09-20，实际=%v", next)
	}

	// 反证：若不剥离时区(直接用 Chicago 时间)，上游完整两步推进会把游标拉回当天 00:00 → 死循环。
	// 第一步 Truncate(24h) 按 UTC 对齐后落在当天 19:00(-0500)，第二步 time.Date(..,0,0,0,loc)
	// 归零到当天 00:00，游标回退、未越过当天，currTime.Before(endTime) 恒成立。
	badDayEnd := time.Date(start.Year(), start.Month(), start.Day(), 23, 59, 59, 0, start.Location())
	badTruncated := badDayEnd.Add(time.Second).Truncate(24 * time.Hour)
	badNext := time.Date(badTruncated.Year(), badTruncated.Month(), badTruncated.Day(), 0, 0, 0, 0, badTruncated.Location())
	if badNext.After(start) {
		t.Fatalf("预期未剥离时区会回退到当天起点，但游标前进了: start=%v badNext=%v", start, badNext)
	}

	// 零值需原样返回。
	if got := stripTimeLocation(time.Time{}); !got.IsZero() {
		t.Fatalf("零值应原样返回: %v", got)
	}
}