package api

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/alicebob/miniredis/v2"
	"github.com/ez-api/ez-api/internal/model"
	"github.com/ez-api/ez-api/internal/service"
	"github.com/gin-gonic/gin"
	"github.com/redis/go-redis/v9"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

func TestMasterStats_AggregatesByKeyAndModel(t *testing.T) {
	gin.SetMode(gin.TestMode)

	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())
	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	if err := db.AutoMigrate(&model.Master{}, &model.Key{}, &model.LogRecord{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}

	m := &model.Master{Name: "m1", Group: "g", Status: "active", Epoch: 1, MasterKeyDigest: "d1"}
	if err := db.Create(m).Error; err != nil {
		t.Fatalf("create master: %v", err)
	}
	k1 := &model.Key{MasterID: m.ID, TokenHash: "h1", Group: "g", Status: "active", IssuedAtEpoch: 1}
	k2 := &model.Key{MasterID: m.ID, TokenHash: "h2", Group: "g", Status: "active", IssuedAtEpoch: 1}
	if err := db.Create(k1).Error; err != nil {
		t.Fatalf("create k1: %v", err)
	}
	if err := db.Create(k2).Error; err != nil {
		t.Fatalf("create k2: %v", err)
	}

	if err := db.Create(&model.LogRecord{
		Group:        "rg",
		KeyID:        k1.ID,
		ModelName:    "ns.m1",
		ProviderID:   10,
		ProviderType: "openai",
		ProviderName: "p1",
		StatusCode:   200,
		TokensIn:     5,
		TokensOut:    7,
	}).Error; err != nil {
		t.Fatalf("create log1: %v", err)
	}
	if err := db.Create(&model.LogRecord{
		Group:        "rg",
		KeyID:        k2.ID,
		ModelName:    "ns.m2",
		ProviderID:   11,
		ProviderType: "anthropic",
		ProviderName: "p2",
		StatusCode:   200,
		TokensIn:     2,
		TokensOut:    3,
	}).Error; err != nil {
		t.Fatalf("create log2: %v", err)
	}

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	masterSvc := service.NewMasterService(db)
	syncSvc := service.NewSyncService(rdb)
	h := NewMasterHandler(db, masterSvc, syncSvc)

	withMaster := func(next gin.HandlerFunc) gin.HandlerFunc {
		return func(c *gin.Context) {
			c.Set("master", m)
			next(c)
		}
	}

	r := gin.New()
	r.GET("/v1/stats", withMaster(h.GetSelfStats))

	req := httptest.NewRequest(http.MethodGet, "/v1/stats?period=all", nil)
	rr := httptest.NewRecorder()
	r.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body=%s", rr.Code, rr.Body.String())
	}
	var resp MasterUsageStatsResponse
	if err := json.Unmarshal(rr.Body.Bytes(), &resp); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	if resp.TotalRequests != 2 || resp.TotalTokens != 17 {
		t.Fatalf("unexpected totals: %+v", resp)
	}
	if len(resp.ByKey) != 2 || len(resp.ByModel) != 2 {
		t.Fatalf("unexpected breakdown: %+v", resp)
	}
}

func TestAdminStats_AggregatesByProvider(t *testing.T) {
	gin.SetMode(gin.TestMode)

	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())
	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	if err := db.AutoMigrate(&model.Master{}, &model.Key{}, &model.LogRecord{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}

	m1 := &model.Master{Name: "m1", Group: "g", Status: "active", Epoch: 1, MasterKeyDigest: "d1"}
	m2 := &model.Master{Name: "m2", Group: "g", Status: "suspended", Epoch: 1, MasterKeyDigest: "d2"}
	if err := db.Create(m1).Error; err != nil {
		t.Fatalf("create m1: %v", err)
	}
	if err := db.Create(m2).Error; err != nil {
		t.Fatalf("create m2: %v", err)
	}
	k1 := &model.Key{MasterID: m1.ID, TokenHash: "h1", Group: "g", Status: "active", IssuedAtEpoch: 1}
	k2 := &model.Key{MasterID: m2.ID, TokenHash: "h2", Group: "g", Status: "active", IssuedAtEpoch: 1}
	if err := db.Create(k1).Error; err != nil {
		t.Fatalf("create k1: %v", err)
	}
	if err := db.Create(k2).Error; err != nil {
		t.Fatalf("create k2: %v", err)
	}

	if err := db.Create(&model.LogRecord{
		Group:        "rg",
		KeyID:        k1.ID,
		ModelName:    "ns.m1",
		ProviderID:   10,
		ProviderType: "openai",
		ProviderName: "p1",
		StatusCode:   200,
		TokensIn:     4,
		TokensOut:    6,
	}).Error; err != nil {
		t.Fatalf("create log1: %v", err)
	}
	if err := db.Create(&model.LogRecord{
		Group:        "rg",
		KeyID:        k2.ID,
		ModelName:    "ns.m2",
		ProviderID:   11,
		ProviderType: "anthropic",
		ProviderName: "p2",
		StatusCode:   200,
		TokensIn:     1,
		TokensOut:    2,
	}).Error; err != nil {
		t.Fatalf("create log2: %v", err)
	}

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	masterSvc := service.NewMasterService(db)
	syncSvc := service.NewSyncService(rdb)
	adminHandler := NewAdminHandler(db, masterSvc, syncSvc)

	r := gin.New()
	r.GET("/admin/stats", adminHandler.GetAdminStats)

	req := httptest.NewRequest(http.MethodGet, "/admin/stats?period=all", nil)
	rr := httptest.NewRecorder()
	r.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body=%s", rr.Code, rr.Body.String())
	}
	var resp AdminUsageStatsResponse
	if err := json.Unmarshal(rr.Body.Bytes(), &resp); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	if resp.TotalMasters != 2 || resp.ActiveMasters != 1 {
		t.Fatalf("unexpected master counts: %+v", resp)
	}
	if resp.TotalRequests != 2 || resp.TotalTokens != 13 {
		t.Fatalf("unexpected totals: %+v", resp)
	}
	if len(resp.ByProvider) != 2 {
		t.Fatalf("expected provider breakdown, got %+v", resp.ByProvider)
	}
}