package core

import (
	"errors"
	"slices"
	"strings"
	"testing"
	"time"

	_ "github.com/mattn/go-sqlite3"
)

func TestCreateSource(t *testing.T) {
	db := EphemeralDb(t)

	if exists, err := SourceExists(db, "one"); exists || err != nil {
		t.Fatal(err)
	}
	if err := AddSource(db, "one"); err != nil {
		t.Fatal(err)
	}
	if exists, err := SourceExists(db, "one"); !exists || err != nil {
		t.Fatal(err)
	}

	if err := AddSource(db, "two"); err != nil {
		t.Fatal(err)
	}
	if err := AddSource(db, "three"); err != nil {
		t.Fatal(err)
	}
	if err := DeleteSource(db, "two"); err != nil {
		t.Fatal(err)
	}

	names, err := GetSources(db)
	if err != nil {
		t.Fatal(err)
	}
	expected := []string{"one", "three"}
	for i := 0; i < len(expected); i += 1 {
		if !slices.Contains(names, expected[i]) {
			t.Fatalf("missing %s, have: %v", expected[i], names)
		}
	}
}

func TestUpdateSourceAddAndDelete(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "test"); err != nil {
		t.Fatal(err)
	}
	update := func(items []Item) (int, int, error) {
		t.Helper()
		return UpdateWithFetchedItems(db, "test", nil, items, time.Now())
	}

	a := Item{Source: "test", Id: "a"}
	add, del, err := update([]Item{a})
	if add != 1 || del != 0 || err != nil {
		t.Fatalf("update failed: add %d, del %d, err %v", add, del, err)
	}

	add, del, err = update([]Item{a})
	if add != 0 || del != 0 || err != nil {
		t.Fatalf("update failed: add %d, del %d, err %v", add, del, err)
	}

	b := Item{Source: "test", Id: "b"}
	add, del, err = update([]Item{a, b})
	if add != 1 || del != 0 || err != nil {
		t.Fatalf("update failed: add %d, del %d, err %v", add, del, err)
	}

	if _, err = DeactivateItem(db, "test", "a"); err != nil {
		t.Fatal(err)
	}
	add, del, err = update([]Item{a, b})
	if add != 0 || del != 0 || err != nil {
		t.Fatalf("update failed: add %d, del %d, err %v", add, del, err)
	}

	add, del, err = update([]Item{b})
	if add != 0 || del != 1 || err != nil {
		t.Fatalf("update failed: add %d, del %d, err %v", add, del, err)
	}

	add, del, err = update([]Item{b})
	if add != 0 || del != 0 || err != nil {
		t.Fatalf("update failed: add %d, del %d, err %v", add, del, err)
	}
}

func TestUpdateSourceTransaction(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "s"); err != nil {
		t.Fatal(err)
	}

	a := Item{Source: "s", Id: "a"}
	b := Item{Source: "s", Id: "b"}

	// Add and deactivate a so it will be deleted on next fetch without it
	if add, _, err := UpdateWithFetchedItems(db, "s", nil, []Item{a}, time.Now()); add != 1 || err != nil {
		t.Fatalf("expected 1 add, got %d and err %v", add, err)
	}
	if _, err := DeactivateItem(db, "s", "a"); err != nil {
		t.Fatal(err)
	}

	// Add b and cause a to be deleted, but the delete throws an error
	fdb := &FailureDb{
		db: db,
		execError: func(q string, a ...any) error {
			if strings.Contains(q, "delete from") {
				return errors.New("no deletes!")
			}
			return nil
		},
	}
	add, del, err := UpdateWithFetchedItems(fdb, "s", nil, []Item{b}, time.Now())
	if add != 0 || del != 0 || err == nil {
		t.Fatalf("expected failure, got %d %d %v", add, del, err)
	}

	// Failure should not add b
	items, err := GetAllItemsForSource(db, "s", 0, -1)
	if err != nil {
		t.Fatal(err)
	}
	if len(items) != 1 {
		t.Fatalf("should only have one item, got %d", len((items)))
	}
	if items[0].Id != "a" {
		t.Fatalf("expected only item to still be a, got %s", items[0].Id)
	}
}

func TestOnCreateAction(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "test"); err != nil {
		t.Fatal(err)
	}
	if err := SetAction(db, "test", "on_create", []string{"true"}); err != nil {
		t.Fatal(err)
	}

	execute := func(argv []string) []Item {
		t.Helper()
		items, _, _, err := Execute("test", argv, nil, nil, "", time.Minute, nil)
		if err != nil {
			t.Fatalf("unexpected error executing test fetch: %v", err)
		}
		if len(items) != 1 {
			t.Fatalf("expected only one item, got %d", len(items))
		}
		return items
	}

	update := func(items []Item) (int, int, error) {
		t.Helper()
		return UpdateWithFetchedItems(db, "test", nil, items, time.Now())
	}

	onCreate := func(argv []string) {
		t.Helper()
		if err := SetAction(db, "test", "on_create", argv); err != nil {
			t.Fatal(err)
		}
	}

	getItem := func(id string) Item {
		t.Helper()
		item, err := GetItem(db, "test", id)
		if err != nil {
			t.Fatal(err)
		}
		return item
	}

	// Noop on_create works
	onCreate([]string{"tee"})
	items := execute([]string{"jq", "-cn", `{id: "one"}`})
	add, _, err := update(items)
	if add != 1 || err != nil {
		t.Fatalf("failed update with noop oncreate: %v", err)
	}
	updated := getItem("one")
	updated.Created = 0 // zero out for comparison with pre-insert item
	if !ItemsAreEqual(updated, items[0]) {
		t.Fatalf("expected no change: %#v != %#v", updated, items[0])
	}

	// on_create can change a field
	onCreate([]string{"jq", "-c", `.title = "Goodbye, World"`})
	items = execute([]string{"jq", "-cn", `{id: "two", title: "Hello, World"}`})
	if items[0].Title != "Hello, World" {
		t.Fatal("unexpected title")
	}
	add, _, err = update(items)
	if add != 1 || err != nil {
		t.Fatal("failed update with alter oncreate")
	}
	two := getItem("two")
	if two.Title != "Goodbye, World" {
		t.Fatalf("title not updated, is: %s", two.Title)
	}

	// on_create can add a field
	onCreate([]string{"jq", "-c", `.link = "gopher://go.dev"`})
	items = execute([]string{"jq", "-cn", `{id: "three"}`})
	if items[0].Link != "" {
		t.Fatal("unexpected link")
	}
	add, _, err = update(items)
	if add != 1 || err != nil {
		t.Fatal("failed update with augment oncreate")
	}
	if getItem("three").Link != "gopher://go.dev" {
		t.Fatal("link not added")
	}

	// on_create can't delete a field using a zero value
	// due to zero values preserving prior field values
	onCreate([]string{"jq", "-c", `del(.link)`})
	items = execute([]string{"jq", "-cn", `{id: "four", link: "gopher://go.dev"}`})
	if items[0].Link != "gopher://go.dev" {
		t.Fatal("missing link")
	}
	add, _, err = update(items)
	if add != 1 || err != nil {
		t.Fatal("failed update with attempted deletion oncreate")
	}
	if getItem("four").Link != "gopher://go.dev" {
		t.Fatal("link unexpectedly removed")
	}

	// item is created if on_create fails
	onCreate([]string{"false"})
	items = execute([]string{"jq", "-cn", `{id: "five"}`})
	add, _, err = update(items)
	if add != 1 || err != nil {
		t.Fatal("failed update with failing oncreate")
	}
	if getItem("five").Id != "five" {
		t.Fatal("item not created")
	}

	// item isn't updated if on_create has valid output but a bad exit code
	onCreate([]string{"sh", "-c", `jq -cn '{id: "six", title: "after"}'; exit 1`})
	items = execute([]string{"jq", "-cn", `{id: "six", title: "before"}`})
	if items[0].Title != "before" {
		t.Fatal("unexpected title")
	}
	add, _, err = update(items)
	if add != 1 || err != nil {
		t.Fatal("failed update with bad exit code oncreate")
	}
	if getItem("six").Title != "before" {
		t.Fatal("update applied after oncreate failed")
	}

	// on_create can't change id, active, or created
	onCreate([]string{"jq", "-c", `.id = "seven"; .active = false; .created = 123456`})
	items = execute([]string{"jq", "-cn", `{id: "seven"}`})
	add, _, err = update(items)
	if add != 1 || err != nil {
		t.Fatal("failed update with invalid field changes oncreate")
	}
	updated = getItem("seven")
	if updated.Id != "seven" || !updated.Active || updated.Created == 123456 {
		t.Fatal("unexpected changes to id, active, or created fields")
	}
}

func TestSourceState(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "s"); err != nil {
		t.Fatal(err)
	}

	state, err := GetState(db, "s")
	if err != nil {
		t.Fatal(err)
	}
	if len(state) != 0 {
		t.Fatal("expected no state on a fresh source")
	}

	if err = SetState(db, "s", []byte("hello, world")); err != nil {
		t.Fatal(err)
	}

	state, err = GetState(db, "s")
	if err != nil {
		t.Fatal(err)
	}
	if string(state) != "hello, world" {
		t.Fatalf("expected hello, world, got %s", state)
	}
}

func TestSourceTtx(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "s"); err != nil {
		t.Fatal(err)
	}
	if err := SetEnvs(db, "s", []string{
		"INTAKE_TTL=30",
		"INTAKE_TTD=60",
		"INTAKE_TTS=90",
	}); err != nil {
		t.Fatal(err)
	}
	postProcess, err := GetSourcePostProcessor(db, "s")
	if err != nil {
		t.Fatal(err)
	}
	before := Item{Source: "s", Id: "i"}
	after := postProcess(before)
	if after.Ttl != 30 || after.Ttd != 60 || after.Tts != 90 {
		t.Fatalf("Missing value after postProcess: ttl = %d, ttd = %d, tts = %d", after.Ttl, after.Ttd, after.Tts)
	}
}

func TestSourceLastUpdated(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "s"); err != nil {
		t.Fatal(err)
	}
	updated, err := GetLastUpdated(db, "s")
	if err != nil {
		t.Fatalf("failed to get lastUpdated: %v", err)
	}
	if updated != time.Unix(0, 0).UTC() {
		t.Fatalf("expected epoch time, got %v", updated)
	}

	now := time.Now().UTC().Round(time.Second)
	_, _, err = UpdateWithFetchedItems(db, "s", nil, nil, now)
	if err != nil {
		t.Fatal(err)
	}

	updated, err = GetLastUpdated(db, "s")
	if err != nil {
		t.Fatalf("failed to get lastUpdated: %v", err)
	}
	if updated != now {
		t.Fatalf("incorrect last updated time\nnow: %v\ngot: %v", now, updated)
	}
}