package handler

import (
	"context"
	"strings"
	"testing"

	logmodel "github.com/perfect-panel/server/internal/model/log"
	"github.com/perfect-panel/server/internal/model/lottery"
	"gorm.io/gorm"
)

func TestCommission_RequiresIdempotencyKey(t *testing.T) {
	db, _, cleanup := newHandlerTestDB(t)
	defer cleanup()

	h := NewCommissionHandler(CommissionDeps{
		Ledger: &fakeLedger{},
		UpdateCommission: func(context.Context, int64, int64, ...*gorm.DB) error {
			t.Fatal("must NOT call UpdateCommission without idempotency key")
			return nil
		},
		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error { return nil },
	})
	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{})
	if err == nil || !strings.Contains(err.Error(), "IdempotencyKey") {
		t.Fatalf("expected IdempotencyKey error, got %v", err)
	}
}

func TestCommission_RequiresTx(t *testing.T) {
	h := NewCommissionHandler(CommissionDeps{Ledger: &fakeLedger{}})
	_, err := h.Dispatch(context.Background(), nil, lottery.DispatchRequest{IdempotencyKey: "k"})
	if err == nil || !strings.Contains(err.Error(), "transaction") {
		t.Fatalf("expected tx error, got %v", err)
	}
}

func TestCommission_IdempotentHitDoesNotWrite(t *testing.T) {
	db, _, cleanup := newHandlerTestDB(t)
	defer cleanup()

	ledger := &fakeLedger{
		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
			return &lottery.GrantLedger{
				Payload: `{"message":"佣金已到账 300"}`,
			}, true, nil
		},
	}
	h := NewCommissionHandler(CommissionDeps{
		Ledger: ledger,
		UpdateCommission: func(context.Context, int64, int64, ...*gorm.DB) error {
			t.Fatal("must NOT UpdateCommission on idempotent hit")
			return nil
		},
		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error {
			t.Fatal("must NOT WriteCommissionLog on idempotent hit")
			return nil
		},
	})

	res, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
		UserId:         42,
		Prize:          lottery.Prize{Config: `{"amount_cents":300}`},
		IdempotencyKey: "lottery:100:200",
	})
	if err != nil {
		t.Fatalf("Dispatch: %v", err)
	}
	if res.Message != "佣金已到账 300" {
		t.Fatalf("expected replay message, got %q", res.Message)
	}
}

func TestCommission_FirstTimeWritesCommissionAndLog(t *testing.T) {
	db, mock, cleanup := newHandlerTestDB(t)
	defer cleanup()

	ledger := &fakeLedger{
		reserveFn: func(_ context.Context, _ *gorm.DB, _ lottery.GrantLedger) (*lottery.GrantLedger, bool, error) {
			return &lottery.GrantLedger{Id: 11}, false, nil
		},
	}

	var (
		updateCommissionCalled = false
		writeLogCalled         = false
		writeLogType           uint16
		writeLogAmount         int64
		writeLogOrderNo        string
	)
	h := NewCommissionHandler(CommissionDeps{
		Ledger: ledger,
		UpdateCommission: func(_ context.Context, uid, amount int64, _ ...*gorm.DB) error {
			updateCommissionCalled = true
			if uid != 42 || amount != 300 {
				t.Fatalf("UpdateCommission got (uid=%d, amount=%d)", uid, amount)
			}
			return nil
		},
		WriteCommissionLog: func(_ *gorm.DB, objectID int64, logType uint16, amount int64, orderNo string) error {
			writeLogCalled = true
			writeLogType = logType
			writeLogAmount = amount
			writeLogOrderNo = orderNo
			if objectID != 42 {
				t.Fatalf("WriteCommissionLog objectID=%d, want 42", objectID)
			}
			return nil
		},
	})

	mock.ExpectExec("UPDATE `lottery_grant_ledger`").
		WillReturnResult(sqlmockAnyResult())

	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
		UserId:         42,
		ActivityId:     100,
		DrawId:         200,
		Prize:          lottery.Prize{Config: `{"amount_cents":300}`},
		IdempotencyKey: "lottery:100:200",
	})
	if err != nil {
		t.Fatalf("Dispatch: %v", err)
	}
	if !updateCommissionCalled || !writeLogCalled {
		t.Fatalf("expected both UpdateCommission and WriteCommissionLog to be called (uc=%v wl=%v)", updateCommissionCalled, writeLogCalled)
	}
	if writeLogType != logmodel.CommissionTypeLottery {
		t.Fatalf("expected CommissionTypeLottery(%d), got %d", logmodel.CommissionTypeLottery, writeLogType)
	}
	if writeLogAmount != 300 {
		t.Fatalf("expected amount 300, got %d", writeLogAmount)
	}
	if writeLogOrderNo != "lottery:100:200" {
		t.Fatalf("expected orderNo to reuse ExternalRef, got %q", writeLogOrderNo)
	}
}

func TestCommission_BadConfigRejected(t *testing.T) {
	db, _, cleanup := newHandlerTestDB(t)
	defer cleanup()

	h := NewCommissionHandler(CommissionDeps{
		Ledger:             &fakeLedger{},
		UpdateCommission:   func(context.Context, int64, int64, ...*gorm.DB) error { return nil },
		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error { return nil },
	})
	tests := []struct {
		name   string
		config string
	}{
		{name: "invalid json", config: `{bad`},
		{name: "zero amount", config: `{"amount_cents":0}`},
		{name: "negative amount", config: `{"amount_cents":-1}`},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
				Prize:          lottery.Prize{Config: tt.config},
				IdempotencyKey: "k",
			})
			if err == nil {
				t.Fatalf("expected error on %s", tt.name)
			}
		})
	}
}

func TestCommission_MissingDepsFailsFast(t *testing.T) {
	db, _, cleanup := newHandlerTestDB(t)
	defer cleanup()

	h := NewCommissionHandler(CommissionDeps{
		Ledger:             &fakeLedger{},
		WriteCommissionLog: func(*gorm.DB, int64, uint16, int64, string) error { return nil },
	})
	_, err := h.Dispatch(context.Background(), db, lottery.DispatchRequest{
		IdempotencyKey: "k",
		Prize:          lottery.Prize{Config: `{"amount_cents":1}`},
	})
	if err == nil {
		t.Fatalf("expected error when deps missing")
	}
}