package repository

import (
	"context"
	"strings"

	"haixun-backend/internal/library/clock"
	app "haixun-backend/internal/library/errors"
	"haixun-backend/internal/library/errors/code"
	"haixun-backend/internal/model/member/domain/entity"
	domrepo "haixun-backend/internal/model/member/domain/repository"

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

type mongoRepository struct {
	collection *mongo.Collection
}

func NewMongoRepository(db *mongo.Database) domrepo.Repository {
	if db == nil {
		return &mongoRepository{}
	}
	return &mongoRepository{collection: db.Collection(entity.CollectionName)}
}

func (r *mongoRepository) EnsureIndexes(ctx context.Context) error {
	if r.collection == nil {
		return nil
	}
	_, err := r.collection.Indexes().CreateMany(ctx, []mongo.IndexModel{
		{Keys: bson.D{{Key: "tenant_id", Value: 1}, {Key: "uid", Value: 1}}, Options: options.Index().SetUnique(true)},
		{Keys: bson.D{{Key: "tenant_id", Value: 1}, {Key: "email", Value: 1}}, Options: options.Index().SetUnique(true)},
	})
	return err
}

func (r *mongoRepository) Create(ctx context.Context, member *entity.Member) (*entity.Member, error) {
	if r.collection == nil {
		return nil, app.For(code.Member).DBUnavailable("Mongo is not configured")
	}
	now := clock.NowUnixNano()
	member.Email = normalizeEmail(member.Email)
	member.CreateAt = now
	member.UpdateAt = now
	if member.ID.IsZero() {
		member.ID = primitive.NewObjectID()
	}
	if member.Status == "" {
		member.Status = entity.StatusOpen
	}
	if member.Origin == "" {
		member.Origin = entity.OriginNative
	}
	_, err := r.collection.InsertOne(ctx, member)
	if mongo.IsDuplicateKeyError(err) {
		return nil, app.For(code.Member).ResConflict("member already exists")
	}
	if err != nil {
		return nil, err
	}
	return member, nil
}

func (r *mongoRepository) FindByUID(ctx context.Context, tenantID, uid string) (*entity.Member, error) {
	return r.findOne(ctx, bson.M{"tenant_id": tenantID, "uid": uid})
}

func (r *mongoRepository) FindByEmail(ctx context.Context, tenantID, email string) (*entity.Member, error) {
	return r.findOne(ctx, bson.M{"tenant_id": tenantID, "email": normalizeEmail(email)})
}

func (r *mongoRepository) SetRoles(ctx context.Context, tenantID, uid string, roles []string) error {
	if r.collection == nil {
		return app.For(code.Member).DBUnavailable("Mongo is not configured")
	}
	if tenantID == "" || uid == "" {
		return app.For(code.Member).InputMissingRequired("tenant_id and uid are required")
	}
	res, err := r.collection.UpdateOne(
		ctx,
		bson.M{"tenant_id": tenantID, "uid": uid},
		bson.M{"$set": bson.M{"roles": roles, "update_at": clock.NowUnixNano()}},
	)
	if err != nil {
		return err
	}
	if res.MatchedCount == 0 {
		return app.For(code.Member).ResNotFound("member not found")
	}
	return nil
}

func (r *mongoRepository) UpdateProfile(ctx context.Context, tenantID, uid string, update domrepo.ProfileUpdate) (*entity.Member, error) {
	if r.collection == nil {
		return nil, app.For(code.Member).DBUnavailable("Mongo is not configured")
	}
	set := bson.M{"update_at": clock.NowUnixNano()}
	if update.DisplayName != nil {
		set["display_name"] = *update.DisplayName
	}
	if update.Avatar != nil {
		set["avatar"] = *update.Avatar
	}
	if update.Language != nil {
		set["language"] = *update.Language
	}
	if update.Currency != nil {
		set["currency"] = *update.Currency
	}
	if update.Phone != nil {
		set["phone"] = *update.Phone
	}
	var out entity.Member
	err := r.collection.FindOneAndUpdate(
		ctx,
		bson.M{"tenant_id": tenantID, "uid": uid},
		bson.M{"$set": set},
		options.FindOneAndUpdate().SetReturnDocument(options.After),
	).Decode(&out)
	if err == mongo.ErrNoDocuments {
		return nil, app.For(code.Member).ResNotFound("member not found")
	}
	return &out, err
}

func (r *mongoRepository) findOne(ctx context.Context, filter bson.M) (*entity.Member, error) {
	if r.collection == nil {
		return nil, app.For(code.Member).DBUnavailable("Mongo is not configured")
	}
	var out entity.Member
	err := r.collection.FindOne(ctx, filter).Decode(&out)
	if err == mongo.ErrNoDocuments {
		return nil, app.For(code.Member).ResNotFound("member not found")
	}
	if err != nil {
		return nil, err
	}
	return &out, nil
}

func normalizeEmail(email string) string {
	return strings.ToLower(strings.TrimSpace(email))
}