package service

import (
	"encoding/json"
	"strconv"
	"testing"

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

type bindingSnapshot struct {
	Namespace   string            `json:"namespace"`
	PublicModel string            `json:"public_model"`
	RouteGroup  string            `json:"route_group"`
	Upstreams   map[string]string `json:"upstreams"`
}

func TestSyncBindings_SelectorExact(t *testing.T) {
	t.Parallel()

	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=shared"), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	if err := db.AutoMigrate(&model.Provider{}, &model.Binding{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}

	p := model.Provider{Name: "p1", Type: "openai", Group: "rg", Models: "m"}
	if err := db.Create(&p).Error; err != nil {
		t.Fatalf("create provider: %v", err)
	}
	b := model.Binding{Namespace: "ns", PublicModel: "m", RouteGroup: "rg", SelectorType: "exact", Status: "active"}
	if err := db.Create(&b).Error; err != nil {
		t.Fatalf("create binding: %v", err)
	}

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	svc := NewSyncService(rdb)
	if err := svc.SyncBindings(db); err != nil {
		t.Fatalf("SyncBindings: %v", err)
	}

	raw := mr.HGet("config:bindings", "ns.m")
	if raw == "" {
		t.Fatalf("expected config:bindings entry")
	}
	var snap bindingSnapshot
	if err := json.Unmarshal([]byte(raw), &snap); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	if snap.Upstreams == nil || snap.Upstreams[jsonID(p.ID)] != "m" {
		t.Fatalf("unexpected upstreams: %+v", snap.Upstreams)
	}
}

func TestSyncBindings_SelectorRegexAndNormalize(t *testing.T) {
	t.Parallel()

	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=shared"), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	if err := db.AutoMigrate(&model.Provider{}, &model.Binding{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}

	p1 := model.Provider{Name: "p1", Type: "openai", Group: "rg", Models: "moonshot/kimi2,kimi2"}
	p2 := model.Provider{Name: "p2", Type: "openai", Group: "rg", Models: "moonshot/kimi2"}
	if err := db.Create(&p1).Error; err != nil {
		t.Fatalf("create provider1: %v", err)
	}
	if err := db.Create(&p2).Error; err != nil {
		t.Fatalf("create provider2: %v", err)
	}

	// Regex should match uniquely (moonshot/kimi2 only).
	bRegex := model.Binding{Namespace: "ns", PublicModel: "kimi2", RouteGroup: "rg", SelectorType: "regex", SelectorValue: "^moonshot/kimi2$", Status: "active"}
	if err := db.Create(&bRegex).Error; err != nil {
		t.Fatalf("create binding regex: %v", err)
	}

	// Normalize_exact should match p2 (moonshot/kimi2) for "kimi2".
	bNorm := model.Binding{Namespace: "ns", PublicModel: "kimi2-n", RouteGroup: "rg", SelectorType: "normalize_exact", SelectorValue: "kimi2", Status: "active"}
	if err := db.Create(&bNorm).Error; err != nil {
		t.Fatalf("create binding normalize: %v", err)
	}

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	svc := NewSyncService(rdb)
	if err := svc.SyncBindings(db); err != nil {
		t.Fatalf("SyncBindings: %v", err)
	}

	// Regex binding should include both providers mapped to moonshot/kimi2 (p1 also has it).
	raw := mr.HGet("config:bindings", "ns.kimi2")
	var snapRegex bindingSnapshot
	if err := json.Unmarshal([]byte(raw), &snapRegex); err != nil {
		t.Fatalf("unmarshal regex: %v", err)
	}
	if snapRegex.Upstreams[jsonID(p1.ID)] != "moonshot/kimi2" || snapRegex.Upstreams[jsonID(p2.ID)] != "moonshot/kimi2" {
		t.Fatalf("unexpected regex upstreams: %+v", snapRegex.Upstreams)
	}

	// Normalize_exact binding should include p2 but exclude p1 due to multi-match (moonshot/kimi2 + kimi2).
	raw = mr.HGet("config:bindings", "ns.kimi2-n")
	var snapNorm bindingSnapshot
	if err := json.Unmarshal([]byte(raw), &snapNorm); err != nil {
		t.Fatalf("unmarshal normalize: %v", err)
	}
	if snapNorm.Upstreams[jsonID(p2.ID)] != "moonshot/kimi2" {
		t.Fatalf("expected p2 upstream, got %+v", snapNorm.Upstreams)
	}
	if _, ok := snapNorm.Upstreams[jsonID(p1.ID)]; ok {
		t.Fatalf("did not expect p1 upstream due to normalize multi-match, got %+v", snapNorm.Upstreams)
	}
}

func jsonID(id uint) string {
	return strconv.FormatUint(uint64(id), 10)
}