package service

import (
	"context"
	"math"
	"testing"
	"time"

	"gorm.io/gorm"

	"oci-portal/internal/model"
	"oci-portal/internal/oci"
)

func costItem(day string, amount float32, currency string) oci.CostItem {
	t, _ := time.Parse("2006-01-02", day)
	return oci.CostItem{TimeStart: &t, ComputedAmount: amount, Currency: currency}
}

func TestRunCostTaskSkipsFreeAndUpserts(t *testing.T) {
	// 日期取相对当前的近两天:任务查近 7 天,窗口外的行会被 Costs 过滤
	day1 := time.Now().UTC().AddDate(0, 0, -2).Format("2006-01-02")
	day2 := time.Now().UTC().AddDate(0, 0, -1).Format("2006-01-02")
	client := &fakeClient{
		tenancy: oci.TenancyInfo{Name: "acme", HomeRegionKey: "FRA"},
		costItems: []oci.CostItem{
			costItem(day1, 5.2, "USD"),
			costItem(day1, 1.4, "USD"),
			costItem(day2, 6.3, "USD"),
		},
	}
	tasks, configs, db := newTaskEnv(t, client)
	ctx := context.Background()
	if _, err := configs.Import(ctx, trialImportInput()); err != nil {
		t.Fatalf("import: %v", err)
	}
	free := trialImportInput()
	free.Alias = "免费号"
	if _, err := configs.Import(ctx, free); err != nil {
		t.Fatalf("import free: %v", err)
	}
	if err := db.Model(&model.OciConfig{}).Where("id = ?", 2).
		Update("account_type", model.AccountTypeFree).Error; err != nil {
		t.Fatalf("mark free: %v", err)
	}

	task, err := tasks.CreateTask(ctx, CreateTaskInput{
		Name: "成本", Type: model.TaskTypeCost, CronExpr: "30 3 * * *",
	})
	if err != nil {
		t.Fatalf("CreateTask: %v", err)
	}
	entry, err := tasks.RunTaskNow(ctx, task.ID)
	if err != nil {
		t.Fatalf("RunTaskNow: %v", err)
	}
	if !entry.Success || entry.Message != "synced usage for 1 tenants, skipped 1 free" {
		t.Errorf("log = %+v, want synced 1 skipped 1", entry)
	}

	assertCostSnapshots(t, db, map[string]float64{day1: 6.6, day2: 6.3})

	// 再次执行为覆盖更新，不产生重复行
	if _, err := tasks.RunTaskNow(ctx, task.ID); err != nil {
		t.Fatalf("RunTaskNow again: %v", err)
	}
	assertCostSnapshots(t, db, map[string]float64{day1: 6.6, day2: 6.3})
}

// assertCostSnapshots 断言快照表恰好为 want 中的日期与金额（配置 #1）。
func assertCostSnapshots(t *testing.T, db *gorm.DB, want map[string]float64) {
	t.Helper()
	var snaps []model.CostSnapshot
	if err := db.Where("oci_config_id = ?", 1).Find(&snaps).Error; err != nil {
		t.Fatalf("load cost snapshots: %v", err)
	}
	if len(snaps) != len(want) {
		t.Fatalf("snapshots = %d rows, want %d", len(snaps), len(want))
	}
	for _, snap := range snaps {
		amount, ok := want[snap.Day]
		// 金额自 float32 累加而来，按容差比较
		if !ok || math.Abs(snap.Amount-amount) > 1e-4 {
			t.Errorf("day %s amount = %v, want %v", snap.Day, snap.Amount, want[snap.Day])
		}
	}
}

func TestRunHealthCheckWritesSnapshot(t *testing.T) {
	client := &fakeClient{
		tenancy:   oci.TenancyInfo{Name: "acme", HomeRegionKey: "FRA"},
		instances: []oci.Instance{{ID: "i1"}, {ID: "i2"}},
	}
	tasks, configs, db := newTaskEnv(t, client)
	ctx := context.Background()
	if _, err := configs.Import(ctx, trialImportInput()); err != nil {
		t.Fatalf("import: %v", err)
	}
	task, err := tasks.CreateTask(ctx, CreateTaskInput{
		Name: "测活", Type: model.TaskTypeHealthCheck, CronExpr: "*/5 * * * *",
	})
	if err != nil {
		t.Fatalf("CreateTask: %v", err)
	}
	if _, err := tasks.RunTaskNow(ctx, task.ID); err != nil {
		t.Fatalf("RunTaskNow: %v", err)
	}
	var snap model.CheckSnapshot
	if err := db.Where("oci_config_id = ?", 1).First(&snap).Error; err != nil {
		t.Fatalf("load snapshot: %v", err)
	}
	if snap.AliveStatus != model.AliveStatusAlive || snap.InstanceCount != 2 {
		t.Errorf("snapshot = %+v, want alive with 2 instances", snap)
	}
}

func TestOverviewAggregates(t *testing.T) {
	client := &fakeClient{
		tenancy:   oci.TenancyInfo{Name: "acme", HomeRegionKey: "FRA"},
		instances: []oci.Instance{{ID: "i1"}},
		costItems: []oci.CostItem{costItem(time.Now().UTC().Format("2006-01-02"), 3.5, "USD")},
	}
	tasks, configs, _ := newTaskEnv(t, client)
	ctx := context.Background()
	if _, err := configs.Import(ctx, trialImportInput()); err != nil {
		t.Fatalf("import: %v", err)
	}
	for _, in := range []CreateTaskInput{
		{Name: "测活", Type: model.TaskTypeHealthCheck, CronExpr: "*/5 * * * *"},
		{Name: "成本", Type: model.TaskTypeCost, CronExpr: "30 3 * * *"},
	} {
		task, err := tasks.CreateTask(ctx, in)
		if err != nil {
			t.Fatalf("CreateTask %s: %v", in.Name, err)
		}
		if _, err := tasks.RunTaskNow(ctx, task.ID); err != nil {
			t.Fatalf("RunTaskNow %s: %v", in.Name, err)
		}
	}

	out, err := configs.Overview(ctx)
	if err != nil {
		t.Fatalf("Overview: %v", err)
	}
	tests := []struct {
		name string
		got  interface{}
		want interface{}
	}{
		{"租户总数", out.Tenants.Total, 1},
		{"存活数", out.Tenants.Alive, 1},
		{"测活任务存在", out.Check.HasActiveTask, true},
		{"测活覆盖", out.Check.CoveredConfigs, 1},
		{"实例数", out.Check.InstanceCount, 1},
		{"成本任务存在", out.Cost.HasActiveTask, true},
		{"成本覆盖", out.Cost.CoveredConfigs, 1},
		{"成本合计", out.Cost.Total, 3.5},
		{"币种", out.Cost.Currency, "USD"},
		{"任务总数", out.Tasks.Total, 2},
		{"active 任务", out.Tasks.Active, 2},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.got != tt.want {
				t.Errorf("got %v, want %v", tt.got, tt.want)
			}
		})
	}
	if len(out.Cost.Days) != 1 {
		t.Errorf("cost days = %d, want 1", len(out.Cost.Days))
	}
}

// TestAggregateCostDaysSplitsCurrencies 锁定多币种聚合:不同币种不相加,
// 顶层字段恒为合计最大的主币种,其余币种进 Series。
func TestAggregateCostDaysSplitsCurrencies(t *testing.T) {
	snaps := []model.CostSnapshot{
		{OciConfigID: 1, Day: "2026-07-20", Amount: 1.5, Currency: "USD"},
		{OciConfigID: 2, Day: "2026-07-20", Amount: 9.0, Currency: "EUR"},
		{OciConfigID: 1, Day: "2026-07-21", Amount: 2.5, Currency: "USD"},
		{OciConfigID: 3, Day: "2026-07-21", Amount: 3.0, Currency: "USD"},
	}
	var cost OverviewCost
	aggregateCostDays(&cost, snaps)
	if cost.CoveredConfigs != 3 || len(cost.Series) != 2 {
		t.Fatalf("covered=%d series=%d, want 3, 2", cost.CoveredConfigs, len(cost.Series))
	}
	if cost.Currency != "EUR" || cost.Total != 9.0 {
		t.Errorf("主币种 = %s %.1f, want EUR 9.0(合计最大)", cost.Currency, cost.Total)
	}
	usd := cost.Series[1]
	if usd.Currency != "USD" || usd.Total != 7.0 || len(usd.Days) != 2 || usd.Days[1].Amount != 5.5 {
		t.Errorf("USD 序列 = %+v, want 两日合计 7.0 且 21 日 5.5", usd)
	}
}