package main

import (
	"context"
	"encoding/json"
	"errors"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/DATA-DOG/go-sqlmock"
)

func TestCreateLoggerWithLevel(t *testing.T) {
	logger := createLoggerWithLevel(slog.LevelWarn)
	if logger == nil {
		t.Fatal("expected logger instance")
	}

	handler := logger.Handler()
	if handler.Enabled(context.Background(), slog.LevelInfo) {
		t.Fatalf("expected info level to be disabled for warn handler")
	}
	if !handler.Enabled(context.Background(), slog.LevelError) {
		t.Fatalf("expected error level to be enabled for warn handler")
	}
}

func TestInsertLiveDataInsertsAllTables(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	config = Config{TZ: "UTC"}

	inverter := Inverter{
		Serial:        "INV01",
		Name:          "Dummy Inverter",
		Producing:     true,
		LimitRelative: 90.5,
		LimitAbsolute: 1500,
		AC: map[string]InverterAC{
			"0": {
				Power:       VUD{V: 123.4},
				Voltage:     VUD{V: 230.0},
				Current:     VUD{V: 0.53},
				Frequency:   VUD{V: 50.0},
				PowerFactor: VUD{V: 0.99},
				ReactivePower: VUD{
					V: 1.1,
				},
			},
		},
		DC: map[string]InverterDC{
			"0": {
				Name: struct {
					U string `json:"u"`
				}{U: "Dummy String"},
				Power:      VUD{V: 111.1},
				Voltage:    VUD{V: 36.5},
				Current:    VUD{V: 3.05},
				YieldDay:   VUD{V: 12.0},
				YieldTotal: VUD{V: 456.7},
				Irradiation: struct {
					V   float64 `json:"v"`
					U   string  `json:"u"`
					D   int     `json:"d"`
					Max int     `json:"max"`
				}{V: 75.0, Max: 440},
			},
		},
		INV: map[string]InverterINV{
			"0": {
				Temperature: VUD{V: 40.0},
				Efficiency:  VUD{V: 97.5},
				PowerDC:     VUD{V: 222.2},
				YieldDay:    VUD{V: 15.0},
				YieldTotal:  VUD{V: 789.0},
			},
		},
	}

	total := Total{
		Power:    VUD{V: 321.0},
		YieldDay: VUD{V: 25.0},
		YieldTotal: VUD{
			V: 12345.6,
		},
	}

	hints := Hints{
		TimeSync:        true,
		RadioProblem:    true,
		DefaultPassword: false,
		PinMappingIssue: true,
	}

	mock.ExpectExec("INSERT INTO opendtu_log").
		WithArgs(sqlmock.AnyArg(), total.Power.V, total.YieldDay.V, total.YieldTotal.V).
		WillReturnResult(sqlmock.NewResult(0, 1))

	mock.ExpectExec("INSERT INTO opendtu_inverters").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, inverter.Name, inverter.Producing, inverter.LimitRelative, inverter.LimitAbsolute).
		WillReturnResult(sqlmock.NewResult(0, 1))

	mock.ExpectExec("INSERT INTO opendtu_inverters_ac").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, "0", inverter.AC["0"].Power.V, inverter.AC["0"].Voltage.V, inverter.AC["0"].Current.V, inverter.AC["0"].Frequency.V, inverter.AC["0"].PowerFactor.V, inverter.AC["0"].ReactivePower.V).
		WillReturnResult(sqlmock.NewResult(0, 1))

	mock.ExpectExec("INSERT INTO opendtu_inverters_dc").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, "0", inverter.DC["0"].Name.U, inverter.DC["0"].Power.V, inverter.DC["0"].Voltage.V, inverter.DC["0"].Current.V, inverter.DC["0"].YieldDay.V, inverter.DC["0"].YieldTotal.V, inverter.DC["0"].Irradiation.V).
		WillReturnResult(sqlmock.NewResult(0, 1))

	mock.ExpectExec("INSERT INTO opendtu_inverters_inv").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, inverter.INV["0"].Temperature.V, inverter.INV["0"].Efficiency.V, inverter.INV["0"].PowerDC.V, inverter.INV["0"].YieldDay.V, inverter.INV["0"].YieldTotal.V).
		WillReturnResult(sqlmock.NewResult(0, 1))

	mock.ExpectExec("INSERT INTO opendtu_hints").
		WithArgs(sqlmock.AnyArg(), hints.TimeSync, hints.RadioProblem, hints.DefaultPassword, hints.PinMappingIssue).
		WillReturnResult(sqlmock.NewResult(0, 1))

	insertLiveData(db, inverter, total, hints)

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("not all expectations were met: %v", err)
	}
}

func TestGetPreviousEventsCount(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	rows := sqlmock.NewRows([]string{"count"}).AddRow(3)
	mock.ExpectQuery("SELECT COUNT\\(\\*\\)").
		WithArgs("INV01").
		WillReturnRows(rows)

	count := getPreviousEventsCount(db, "INV01")
	if count != 3 {
		t.Fatalf("expected count 3, got %d", count)
	}

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("not all expectations were met: %v", err)
	}
}

func TestInsertEventsPersistsRows(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	config = Config{TZ: "UTC"}

	events := &EventsResponse{
		Events: []Event{
			{
				MessageID: 10,
				Message:   "Test event",
				StartTime: 111,
				EndTime:   222,
			},
		},
	}

	mock.ExpectExec("INSERT INTO opendtu_events").
		WithArgs(sqlmock.AnyArg(), "INV01", events.Events[0].MessageID, events.Events[0].Message, events.Events[0].StartTime, events.Events[0].EndTime).
		WillReturnResult(sqlmock.NewResult(0, 1))

	insertEvents(db, "INV01", events)

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("not all expectations were met: %v", err)
	}
}

func TestUpdateEventsUpdatesRows(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	events := &EventsResponse{
		Events: []Event{
			{
				StartTime: 100,
				EndTime:   200,
			},
			{
				StartTime: 300,
				EndTime:   400,
			},
		},
	}

	mock.ExpectExec("UPDATE opendtu_events SET end_time").
		WithArgs(events.Events[0].EndTime, "INV01", events.Events[0].StartTime).
		WillReturnResult(sqlmock.NewResult(0, 1))

	mock.ExpectExec("UPDATE opendtu_events SET end_time").
		WithArgs(events.Events[1].EndTime, "INV01", events.Events[1].StartTime).
		WillReturnResult(sqlmock.NewResult(0, 1))

	updateEvents(db, "INV01", events)

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("not all expectations were met: %v", err)
	}
}

func TestHandleMessageRecordsDataAndEvents(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	eventsResponse := EventsResponse{
		Count:  1,
		Events: []Event{{MessageID: 1, Message: "Test event", StartTime: 50, EndTime: 60}},
	}

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/eventlog/status" {
			t.Fatalf("unexpected path: %s", r.URL.Path)
		}
		if got := r.URL.Query().Get("inv"); got != "INV01" {
			t.Fatalf("unexpected inverter query: %s", got)
		}
		if err := json.NewEncoder(w).Encode(eventsResponse); err != nil {
			t.Fatalf("failed to write response: %v", err)
		}
	}))
	defer server.Close()

	previousConfig := config
	defer func() { config = previousConfig }()

	address := strings.TrimPrefix(server.URL, "http://")
	address = strings.TrimPrefix(address, "https://")
	config = Config{
		TZ:             "UTC",
		OpenDTUAddress: address,
	}

	rows := sqlmock.NewRows([]string{"count"}).AddRow(1)
	mock.ExpectQuery("SELECT COUNT\\(\\*\\)").
		WithArgs("INV01").
		WillReturnRows(rows)

	mock.ExpectExec("INSERT INTO opendtu_events").
		WithArgs(sqlmock.AnyArg(), "INV01", eventsResponse.Events[0].MessageID, eventsResponse.Events[0].Message, eventsResponse.Events[0].StartTime, eventsResponse.Events[0].EndTime).
		WillReturnResult(sqlmock.NewResult(0, 1))

	inverter := Inverter{
		Serial:        "INV01",
		Name:          "Dummy Inverter",
		Producing:     true,
		Reachable:     true,
		DataAge:       0,
		Events:        2,
		LimitRelative: 90.5,
		LimitAbsolute: 1500,
		AC: map[string]InverterAC{
			"0": {
				Power:         VUD{V: 123.4},
				Voltage:       VUD{V: 230.0},
				Current:       VUD{V: 0.53},
				Frequency:     VUD{V: 50.0},
				PowerFactor:   VUD{V: 0.99},
				ReactivePower: VUD{V: 1.1},
			},
		},
		DC: map[string]InverterDC{
			"0": {
				Name: struct {
					U string `json:"u"`
				}{U: "Dummy String"},
				Power:      VUD{V: 111.1},
				Voltage:    VUD{V: 36.5},
				Current:    VUD{V: 3.05},
				YieldDay:   VUD{V: 12.0},
				YieldTotal: VUD{V: 456.7},
				Irradiation: struct {
					V   float64 `json:"v"`
					U   string  `json:"u"`
					D   int     `json:"d"`
					Max int     `json:"max"`
				}{V: 75.0, Max: 440},
			},
		},
		INV: map[string]InverterINV{
			"0": {
				Temperature: VUD{V: 40.0},
				Efficiency:  VUD{V: 97.5},
				PowerDC:     VUD{V: 222.2},
				YieldDay:    VUD{V: 15.0},
				YieldTotal:  VUD{V: 789.0},
			},
		},
	}

	total := Total{
		Power:    VUD{V: 321.0},
		YieldDay: VUD{V: 25.0},
		YieldTotal: VUD{
			V: 12345.6,
		},
	}

	hints := Hints{
		TimeSync:        true,
		RadioProblem:    true,
		DefaultPassword: false,
		PinMappingIssue: true,
	}

	mock.ExpectExec("INSERT INTO opendtu_log").
		WithArgs(sqlmock.AnyArg(), total.Power.V, total.YieldDay.V, total.YieldTotal.V).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec("INSERT INTO opendtu_inverters").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, inverter.Name, inverter.Producing, inverter.LimitRelative, inverter.LimitAbsolute).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec("INSERT INTO opendtu_inverters_ac").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, "0", inverter.AC["0"].Power.V, inverter.AC["0"].Voltage.V, inverter.AC["0"].Current.V, inverter.AC["0"].Frequency.V, inverter.AC["0"].PowerFactor.V, inverter.AC["0"].ReactivePower.V).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec("INSERT INTO opendtu_inverters_dc").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, "0", inverter.DC["0"].Name.U, inverter.DC["0"].Power.V, inverter.DC["0"].Voltage.V, inverter.DC["0"].Current.V, inverter.DC["0"].YieldDay.V, inverter.DC["0"].YieldTotal.V, inverter.DC["0"].Irradiation.V).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec("INSERT INTO opendtu_inverters_inv").
		WithArgs(sqlmock.AnyArg(), inverter.Serial, inverter.INV["0"].Temperature.V, inverter.INV["0"].Efficiency.V, inverter.INV["0"].PowerDC.V, inverter.INV["0"].YieldDay.V, inverter.INV["0"].YieldTotal.V).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec("INSERT INTO opendtu_hints").
		WithArgs(sqlmock.AnyArg(), hints.TimeSync, hints.RadioProblem, hints.DefaultPassword, hints.PinMappingIssue).
		WillReturnResult(sqlmock.NewResult(0, 1))

	liveData := LiveData{
		Inverters: []Inverter{inverter},
		Total:     total,
		Hints:     hints,
	}

	payload, err := json.Marshal(liveData)
	if err != nil {
		t.Fatalf("failed to marshal live data: %v", err)
	}

	handleMessage(payload, db)

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("not all expectations were met: %v", err)
	}
}

func TestHandleMessageSkipsWhenDataStale(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	liveData := LiveData{
		Inverters: []Inverter{
			{
				Serial:    "INV01",
				Reachable: false,
				DataAge:   10,
				Events:    2,
			},
		},
	}

	payload, err := json.Marshal(liveData)
	if err != nil {
		t.Fatalf("failed to marshal live data: %v", err)
	}

	handleMessage(payload, db)

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("unexpected database calls: %v", err)
	}
}

func TestEnableTimescaleHypertablesExecutesStatements(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	mock.ExpectExec("(?s).*create_hypertable\\('opendtu_log'").
		WillReturnResult(sqlmock.NewResult(0, 1))

	if err := enableTimescaleHypertables(db); err != nil {
		t.Fatalf("expected no error, got %v", err)
	}

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("not all expectations were met: %v", err)
	}
}

func TestEnableTimescaleHypertablesPropagatesError(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("failed to create sqlmock: %v", err)
	}
	defer db.Close()

	mock.ExpectExec("(?s).*create_hypertable\\('opendtu_log'").
		WillReturnError(errors.New("boom"))

	err = enableTimescaleHypertables(db)
	if err == nil {
		t.Fatalf("expected error, got nil")
	}

	if !strings.Contains(err.Error(), "boom") {
		t.Fatalf("expected wrapped boom error, got %v", err)
	}

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("expectations mismatch: %v", err)
	}
}