package upstreamapi

import (
	"context"
	"path/filepath"
	"testing"

	"git.5iot.com/iotlcm-public/iotlcm-upstream-chan/internal/logic/channelconfig"
	"git.5iot.com/iotlcm-public/iotlcm-upstream-chan/internal/model"
	"git.5iot.com/iotlcm-public/iotlcm-upstream-chan/internal/service"

	_ "github.com/gogf/gf/contrib/drivers/sqlite/v2"
	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/frame/g"
)

type normalGateTestChannel struct {
	model.SimCardChannelI
}

type normalGateTestTemplate struct {
	calls      int
	lastConfig *model.SimChannelConfigItemCache
}

func (f *normalGateTestTemplate) NewTemp(_ context.Context, cfg *model.SimChannelConfigItemCache) model.SimCardChannelI {
	f.calls++
	f.lastConfig = cfg
	return &normalGateTestChannel{}
}

// Exercise real ORM decoding and config versioning as well as both creation paths.
// All SQL runs against a temporary SQLite file, never a configured environment DB.
func TestChannelNormalCreationGate(t *testing.T) {
	ctx := context.Background()
	if err := gdb.SetConfigGroup("default", gdb.ConfigGroup{{
		Type: "sqlite", Name: filepath.Join(t.TempDir(), "channels.db"),
	}}); err != nil {
		t.Fatal(err)
	}
	db := g.DB()
	t.Cleanup(func() { _ = db.Close(ctx) })
	execSQL := func(query string, args ...any) {
		t.Helper()
		if _, err := db.Exec(ctx, query, args...); err != nil {
			t.Fatal(err)
		}
	}
	execSQL("CREATE TABLE t_sim_channels (id INTEGER PRIMARY KEY, chan_key TEXT, temp_key TEXT, chan_name TEXT, is_normal INTEGER NULL)")
	execSQL("CREATE TABLE t_sim_channel_template (id INTEGER PRIMARY KEY, temp_key TEXT, temp_model TEXT)")
	execSQL("INSERT INTO t_sim_channel_template (id, temp_key, temp_model) VALUES (1, 'gate_test', 'direct')")

	oldConfig := service.ChannelConfig()
	t.Cleanup(func() { service.RegisterChannelConfig(oldConfig) })

	for _, path := range []string{"loop", "refresh"} {
		t.Run(path, func(t *testing.T) {
			for _, tc := range []struct {
				name     string
				value    any
				eligible bool
			}{
				{"yes_is_zero", 0, true},
				{"no_is_one", 1, false},
				{"null", nil, false},
				{"unexpected", 2, false},
			} {
				t.Run(tc.name, func(t *testing.T) {
					execSQL("DELETE FROM t_sim_channels")
					execSQL("INSERT INTO t_sim_channels (id, chan_key, temp_key, is_normal) VALUES (1, 'gate_channel', 'gate_test', ?)", tc.value)
					config := channelconfig.NewChannelConfig()
					service.RegisterChannelConfig(config)
					api := NewUpstreamAPI()
					factory := &normalGateTestTemplate{}
					api.RegisterTemp("gate_test", factory)
					reload := func() {
						t.Helper()
						var err error
						if path == "loop" {
							err = config.LoadAllChannelConfig(ctx)
							if err == nil {
								err = api.loop(ctx)
							}
						} else {
							err = api.RefreshChannel(ctx, "gate_channel")
						}
						if err != nil {
							t.Fatalf("refresh must succeed: %v", err)
						}
					}
					reload()
					cfg, ok := config.GetChannel("gate_channel")
					if !ok || cfg.CanCreateInstance() != tc.eligible {
						t.Fatalf("wrong eligibility after ORM scan: %+v", cfg)
					}
					if tc.value == nil && cfg.IsNormal != nil {
						t.Fatalf("SQL NULL decoded as non-nil: %v", *cfg.IsNormal)
					}
					if cfg.Channel.ChanKey != "gate_channel" {
						t.Fatal("embedded channel fields were not scanned")
					}
					_, exists := api.GetChan("gate_channel")
					if exists != tc.eligible || (factory.calls == 1) != tc.eligible {
						t.Fatalf("instance exists=%v factory calls=%d eligible=%v", exists, factory.calls, tc.eligible)
					}
					initialVersion := cfg.Version

					// Only is_normal changes: the configuration cache must notice it.
					execSQL("UPDATE t_sim_channels SET is_normal=0")
					reload()
					current, ok := api.GetChan("gate_channel")
					if !ok || current.Instance == nil {
						t.Fatal("eligible channel was not instantiated")
					}
					cfg, _ = config.GetChannel("gate_channel")
					if !tc.eligible && cfg.Version == initialVersion {
						t.Fatal("changing only is_normal did not change config version")
					}
					oldCalls := factory.calls

					// Becoming ineligible must remove the old runtime instance.
					execSQL("UPDATE t_sim_channels SET is_normal=1, chan_name='changed while disabled', temp_key='missing_template'")
					reload()
					if _, exists := api.GetChan("gate_channel"); exists || factory.calls != oldCalls {
						t.Fatal("ineligible channel retained or rebuilt its runtime instance")
					}
					cfg, _ = config.GetChannel("gate_channel")
					if cfg.CanCreateInstance() {
						t.Fatal("ineligible config must remain ineligible")
					}
					// Repeat the disabled refresh, as a retry would.
					reload()
					if factory.calls != oldCalls {
						t.Fatal("retry created an ineligible instance")
					}

					// A process restart cannot recreate the retained disabled instance.
					restarted := NewUpstreamAPI()
					restarted.RegisterTemp("gate_test", factory)
					if err := restarted.loop(ctx); err != nil {
						t.Fatal(err)
					}
					if _, ok := restarted.GetChan("gate_channel"); ok {
						t.Fatal("restart recreated disabled instance")
					}

					execSQL("UPDATE t_sim_channels SET is_normal=0, temp_key='gate_test'")
					reload()
					restored, _ := api.GetChan("gate_channel")
					if restored == current || factory.calls != oldCalls+1 ||
						factory.lastConfig.Channel.ChanName != "changed while disabled" {
						t.Fatal("restored channel did not rebuild using the latest configuration")
					}
				})
			}
		})
	}
}