package core

import (
	"fmt"
	"slices"
	"testing"
	"time"

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

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

	if err := AddSource(db, "one"); 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 AssertItemIs(t *testing.T, item Item, expected string) {
	actual := fmt.Sprintf(
		"%s/%s/%t/%s/%s/%s/%s/%d",
		item.Source,
		item.Id,
		item.Active,
		item.Title,
		item.Author,
		item.Body,
		item.Link,
		item.Time,
	)
	if actual != expected {
		t.Fatalf("expected %s, got %s", expected, actual)
	}
}

func TestAddItem(t *testing.T) {
	db := EphemeralDb(t)
	if err := AddSource(db, "test"); err != nil {
		t.Fatalf("failed to add source: %v", err)
	}

	if err := AddItems(db, []Item{
		{"test", "one", 0, true, "", "", "", "", 0},
		{"test", "two", 0, true, "title", "author", "body", "link", 123456},
	}); err != nil {
		t.Fatalf("failed to add items: %v", err)
	}
	items, err := GetActiveItemsForSource(db, "test")
	if err != nil {
		t.Fatalf("failed to get active items: %v", err)
	}
	if len(items) != 2 {
		t.Fatal("should get two items")
	}
	AssertItemIs(t, items[0], "test/one/true/////0")
	AssertItemIs(t, items[1], "test/two/true/title/author/body/link/123456")

	if _, err = DeactivateItem(db, "test", "one"); err != nil {
		t.Fatal(err)
	}
	items, err = GetActiveItemsForSource(db, "test")
	if err != nil {
		t.Fatal(err)
	}
	if len(items) != 1 {
		t.Fatal("should get one item")
	}

	items, err = GetAllItemsForSource(db, "test")
	if err != nil {
		t.Fatal(err)
	}
	if len(items) != 2 {
		t.Fatal("should get two items")
	}

	deleted, err := DeleteItem(db, "test", "one")
	if err != nil {
		t.Fatal(err)
	}
	if deleted != 1 {
		t.Fatal("expected one deletion")
	}

	deleted, err = DeleteItem(db, "test", "one")
	if err != nil {
		t.Fatal(err)
	}
	if deleted != 0 {
		t.Fatal("expected no deletion")
	}

	items, err = GetAllItemsForSource(db, "test")
	if err != nil {
		t.Fatal(err)
	}
	if len(items) != 1 {
		t.Fatal("should get one item")
	}
}

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

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

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

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

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

	getItem := func(id string) Item {
		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 := UpdateWithFetchedItems(db, "test", items)
	if add != 1 || err != nil {
		t.Fatal("failed update with noop oncreate")
	}
	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 = UpdateWithFetchedItems(db, "test", items)
	if add != 1 || err != nil {
		t.Fatal("failed update with alter oncreate")
	}
	if getItem("two").Title != "Goodbye, World" {
		t.Fatal("title not updated")
	}

	// 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 = UpdateWithFetchedItems(db, "test", 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 = UpdateWithFetchedItems(db, "test", 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 = UpdateWithFetchedItems(db, "test", 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 = UpdateWithFetchedItems(db, "test", 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 = UpdateWithFetchedItems(db, "test", 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")
	}
}