package assetloader_test

import (
	"os"
	"path/filepath"
	"testing"

	"git.warky.dev/wdevs/relspecgo/pkg/assetloader"
)

func TestLoadManifest_ValidList(t *testing.T) {
	dir := t.TempDir()
	writeFile(t, dir, "assets.yaml", `
- file: hello.txt
  call: INSERT INTO files (name, data) VALUES (:filename, :bytes)
- file: logo.png
  call: UPDATE branding SET logo = :bytes WHERE id = 1
`)
	writeFile(t, dir, "hello.txt", "hello world")
	writeFile(t, dir, "logo.png", "\x89PNG\r\n\x1a\n")

	m, err := assetloader.LoadManifest(dir)
	if err != nil {
		t.Fatalf("LoadManifest failed: %v", err)
	}
	if len(m) != 2 {
		t.Fatalf("expected 2 entries, got %d", len(m))
	}
	if m[0].File != "hello.txt" {
		t.Errorf("entry 0 file: got %q, want %q", m[0].File, "hello.txt")
	}
	if m[1].File != "logo.png" {
		t.Errorf("entry 1 file: got %q, want %q", m[1].File, "logo.png")
	}
}

func TestLoadManifest_WithStaticParams(t *testing.T) {
	dir := t.TempDir()
	writeFile(t, dir, "assets.yaml", `
- file: template.md
  call: INSERT INTO templates (owner_id, name, data) VALUES (:owner_id, :filename, :bytes)
  params:
    owner_id: "42"
`)
	writeFile(t, dir, "template.md", "# Template")

	m, err := assetloader.LoadManifest(dir)
	if err != nil {
		t.Fatalf("LoadManifest failed: %v", err)
	}
	if len(m) != 1 {
		t.Fatalf("expected 1 entry, got %d", len(m))
	}
	if m[0].Params["owner_id"] != "42" {
		t.Errorf("static param owner_id: got %q, want %q", m[0].Params["owner_id"], "42")
	}
}

func TestLoadManifest_MissingFile(t *testing.T) {
	dir := t.TempDir()
	// No assets.yaml present
	_, err := assetloader.LoadManifest(dir)
	if err == nil {
		t.Fatal("expected error for missing assets.yaml, got nil")
	}
}

func TestLoadManifest_InvalidYAML(t *testing.T) {
	dir := t.TempDir()
	writeFile(t, dir, "assets.yaml", `{not: [valid yaml`)
	_, err := assetloader.LoadManifest(dir)
	if err == nil {
		t.Fatal("expected error for invalid YAML, got nil")
	}
}

func TestScanDir_FindsManifests(t *testing.T) {
	root := t.TempDir()

	// Directory named with priority-sequence pattern
	dir1 := filepath.Join(root, "1_010_seed_templates")
	if err := os.MkdirAll(dir1, 0o755); err != nil {
		t.Fatal(err)
	}
	writeFile(t, dir1, "assets.yaml", `
- file: a.txt
  call: INSERT INTO t (data) VALUES (:bytes)
`)
	writeFile(t, dir1, "a.txt", "aaa")

	dir2 := filepath.Join(root, "2_001_branding")
	if err := os.MkdirAll(dir2, 0o755); err != nil {
		t.Fatal(err)
	}
	writeFile(t, dir2, "assets.yaml", `
- file: logo.png
  call: UPDATE branding SET logo = :bytes
`)
	writeFile(t, dir2, "logo.png", "PNG")

	items, err := assetloader.ScanDir(root)
	if err != nil {
		t.Fatalf("ScanDir failed: %v", err)
	}
	if len(items) != 2 {
		t.Fatalf("expected 2 items, got %d", len(items))
	}
	// Should be ordered by priority then sequence
	if items[0].Priority != 1 || items[0].Sequence != 10 {
		t.Errorf("item[0]: got priority=%d seq=%d, want 1,10", items[0].Priority, items[0].Sequence)
	}
	if items[1].Priority != 2 || items[1].Sequence != 1 {
		t.Errorf("item[1]: got priority=%d seq=%d, want 2,1", items[1].Priority, items[1].Sequence)
	}
}

func TestScanDir_OrdersByPriorityThenSequence(t *testing.T) {
	root := t.TempDir()

	for _, d := range []string{"2_002_b", "1_001_a", "2_001_c", "1_002_d"} {
		dir := filepath.Join(root, d)
		if err := os.MkdirAll(dir, 0o755); err != nil {
			t.Fatal(err)
		}
		writeFile(t, dir, "assets.yaml", `
- file: x.txt
  call: SELECT :bytes
`)
		writeFile(t, dir, "x.txt", "x")
	}

	items, err := assetloader.ScanDir(root)
	if err != nil {
		t.Fatalf("ScanDir failed: %v", err)
	}
	if len(items) != 4 {
		t.Fatalf("expected 4 items, got %d", len(items))
	}

	type ps struct{ p int; s uint }
	want := []ps{{1, 1}, {1, 2}, {2, 1}, {2, 2}}
	for i, w := range want {
		got := ps{items[i].Priority, items[i].Sequence}
		if got != w {
			t.Errorf("items[%d]: got {%d,%d}, want {%d,%d}", i, got.p, got.s, w.p, w.s)
		}
	}
}

func TestScanDir_SkipsSymlinks(t *testing.T) {
	root := t.TempDir()

	dir1 := filepath.Join(root, "1_001_real")
	if err := os.MkdirAll(dir1, 0o755); err != nil {
		t.Fatal(err)
	}
	writeFile(t, dir1, "assets.yaml", `
- file: a.txt
  call: SELECT :bytes
`)
	writeFile(t, dir1, "a.txt", "real")

	// Symlink to an asset file - should be skipped during file read
	realFile := filepath.Join(root, "real.txt")
	writeFile(t, root, "real.txt", "symlink target")
	symlink := filepath.Join(dir1, "link.txt")
	if err := os.Symlink(realFile, symlink); err != nil {
		t.Skip("symlinks not supported:", err)
	}

	// Add a manifest entry that references the symlink
	writeFile(t, dir1, "assets.yaml", `
- file: a.txt
  call: SELECT :bytes
- file: link.txt
  call: SELECT :bytes
`)

	items, err := assetloader.ScanDir(root)
	if err != nil {
		t.Fatalf("ScanDir failed: %v", err)
	}
	// The symlink entry should be skipped; only a.txt should remain
	if len(items) != 1 {
		t.Fatalf("expected 1 item after symlink skip, got %d", len(items))
	}
	if filepath.Base(items[0].Entry.File) != "a.txt" {
		t.Errorf("expected non-symlink entry, got %q", items[0].Entry.File)
	}
}

func TestScanDir_RejectsPathTraversal(t *testing.T) {
	root := t.TempDir()

	dir1 := filepath.Join(root, "1_001_evil")
	if err := os.MkdirAll(dir1, 0o755); err != nil {
		t.Fatal(err)
	}
	writeFile(t, dir1, "assets.yaml", `
- file: ../../etc/passwd
  call: SELECT :bytes
`)

	items, err := assetloader.ScanDir(root)
	if err != nil {
		t.Fatalf("ScanDir failed: %v", err)
	}
	// Path traversal entry should be skipped
	if len(items) != 0 {
		t.Fatalf("expected 0 items after path traversal rejection, got %d", len(items))
	}
}

func TestBuildQuery_BasicPlaceholders(t *testing.T) {
	sql, args, err := assetloader.BuildQuery(
		"INSERT INTO t (name, data) VALUES (:filename, :bytes)",
		[]byte("hello"),
		"hello.txt",
		nil,
	)
	if err != nil {
		t.Fatalf("BuildQuery failed: %v", err)
	}
	if sql != "INSERT INTO t (name, data) VALUES ($1, $2)" {
		t.Errorf("unexpected SQL: %s", sql)
	}
	if len(args) != 2 {
		t.Fatalf("expected 2 args, got %d", len(args))
	}
	if string(args[0].(string)) != "hello.txt" {
		t.Errorf("args[0]: got %q, want %q", args[0], "hello.txt")
	}
	if string(args[1].([]byte)) != "hello" {
		t.Errorf("args[1]: got %v, want %v", args[1], []byte("hello"))
	}
}

func TestBuildQuery_StaticParams(t *testing.T) {
	sql, args, err := assetloader.BuildQuery(
		"INSERT INTO t (owner, name, data) VALUES (:owner_id, :filename, :bytes)",
		[]byte("data"),
		"file.bin",
		map[string]string{"owner_id": "99"},
	)
	if err != nil {
		t.Fatalf("BuildQuery failed: %v", err)
	}
	if sql != "INSERT INTO t (owner, name, data) VALUES ($1, $2, $3)" {
		t.Errorf("unexpected SQL: %s", sql)
	}
	if len(args) != 3 {
		t.Fatalf("expected 3 args, got %d: %v", len(args), args)
	}
	if args[0].(string) != "99" {
		t.Errorf("args[0]: got %q, want %q", args[0], "99")
	}
}

func TestBuildQuery_RepeatedPlaceholder(t *testing.T) {
	sql, args, err := assetloader.BuildQuery(
		"SELECT length(:bytes), encode(:bytes, 'base64')",
		[]byte("abc"),
		"f.bin",
		nil,
	)
	if err != nil {
		t.Fatalf("BuildQuery failed: %v", err)
	}
	// :bytes appears twice but maps to same $1
	if sql != "SELECT length($1), encode($1, 'base64')" {
		t.Errorf("unexpected SQL: %s", sql)
	}
	if len(args) != 1 {
		t.Fatalf("expected 1 arg, got %d", len(args))
	}
}

func TestBuildQuery_PostgresCastNotMatched(t *testing.T) {
	// ::text should NOT be treated as a placeholder
	sql, args, err := assetloader.BuildQuery(
		"SELECT :bytes::text, :filename",
		[]byte("data"),
		"f.txt",
		nil,
	)
	if err != nil {
		t.Fatalf("BuildQuery failed: %v", err)
	}
	if sql != "SELECT $1::text, $2" {
		t.Errorf("unexpected SQL: %s", sql)
	}
	if len(args) != 2 {
		t.Fatalf("expected 2 args, got %d", len(args))
	}
}

func TestBuildQuery_UnknownPlaceholder(t *testing.T) {
	_, _, err := assetloader.BuildQuery(
		"SELECT :unknown_param",
		[]byte("data"),
		"f.txt",
		nil,
	)
	if err == nil {
		t.Fatal("expected error for unknown placeholder, got nil")
	}
}

func TestBuildQuery_BinaryFileByteExact(t *testing.T) {
	// Binary data with null bytes, high bytes - must pass through unchanged
	binary := []byte{0x00, 0xFF, 0x80, 0x01, 0xFE}
	_, args, err := assetloader.BuildQuery(
		"INSERT INTO blobs (data) VALUES (:bytes)",
		binary,
		"blob.bin",
		nil,
	)
	if err != nil {
		t.Fatalf("BuildQuery failed: %v", err)
	}
	if len(args) != 1 {
		t.Fatalf("expected 1 arg")
	}
	got := args[0].([]byte)
	if len(got) != len(binary) {
		t.Fatalf("byte count: got %d, want %d", len(got), len(binary))
	}
	for i, b := range binary {
		if got[i] != b {
			t.Errorf("byte[%d]: got 0x%02x, want 0x%02x", i, got[i], b)
		}
	}
}

// writeFile is a test helper that writes content to a file.
func writeFile(t *testing.T, dir, name, content string) {
	t.Helper()
	if err := os.WriteFile(filepath.Join(dir, name), []byte(content), 0o644); err != nil {
		t.Fatalf("writeFile %s: %v", name, err)
	}
}