package main

import (
	"database/sql"
	"os"
	"testing"

	_ "github.com/lib/pq"
)

// newTestStore opens a connection to the test DB, skipping if not available.
// Pattern from go-htmx-web-dev skill: TDD mandatory, no code without tests.
func newTestStore(t *testing.T) *Store {
	t.Helper()
	dsn := os.Getenv("POSTS_TEST_DSN")
	if dsn == "" {
		dsn = "postgres://posts:posts@127.0.0.1:5432/posts_test?sslmode=disable"
	}
	db, err := sql.Open("postgres", dsn)
	if err != nil {
		t.Skipf("no test db: %v", err)
	}
	if err := db.Ping(); err != nil {
		t.Skipf("no test db: %v", err)
	}
	return NewStore(db)
}

func TestCreatePostBumpsAt(t *testing.T) {
	s := newTestStore(t)
	p, err := s.CreatePost("scott", "Hello", "world", []string{"scobleclaw"})
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	if p.ID == "" {
		t.Fatal("expected id")
	}
	if p.BumpedAt.IsZero() {
		t.Fatal("expected bumped_at set")
	}
}

func TestAddCommentBumpsPost(t *testing.T) {
	s := newTestStore(t)
	p, err := s.CreatePost("scott", "Hello", "world", nil)
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	before := p.BumpedAt

	// sleep a beat so timestamps are strictly different
	// (we're testing logical correctness; in CI you'd inject a clock)
	c, err := s.AddComment(p.ID, "", "hermes", "first!")
	if err != nil {
		t.Fatalf("add comment: %v", err)
	}
	if c.Path != c.ID {
		t.Fatalf("top-level path should equal id, got %q", c.Path)
	}

	got, err := s.GetPost(p.ID)
	if err != nil {
		t.Fatalf("get: %v", err)
	}
	if !got.BumpedAt.After(before) && !got.BumpedAt.Equal(before) {
		t.Fatalf("post should have been bumped, before=%v after=%v", before, got.BumpedAt)
	}
}

func TestNestedCommentPath(t *testing.T) {
	s := newTestStore(t)
	p, err := s.CreatePost("scott", "Tree test", "body", nil)
	if err != nil {
		t.Fatal(err)
	}
	c1, err := s.AddComment(p.ID, "", "hermes", "top")
	if err != nil {
		t.Fatal(err)
	}
	c2, err := s.AddComment(p.ID, c1.ID, "hermes", "nested")
	if err != nil {
		t.Fatal(err)
	}
	if c2.Depth != 1 {
		t.Fatalf("expected depth 1, got %d", c2.Depth)
	}
	wantPrefix := c1.ID + "."
	if !startsWith(c2.Path, wantPrefix) {
		t.Fatalf("path %q should start with %q", c2.Path, wantPrefix)
	}
}

func startsWith(s, prefix string) bool {
	return len(s) >= len(prefix) && s[:len(prefix)] == prefix
}