package database

import (
	"context"
	"testing"
	"time"
)

// runStoreTests runs the test suite against a Store implementation.
func runStoreTests(t *testing.T, newStore func(t *testing.T) Store) {
	tests := []struct {
		name string
		test func(t *testing.T, store Store)
	}{
		{"Initialize", testInitialize},
		{"Revisions", testRevisions},
		{"Options", testOptions},
		{"OptionsSearch", testOptionsSearch},
		{"OptionChildren", testOptionChildren},
		{"Declarations", testDeclarations},
		{"Files", testFiles},
		{"SchemaVersion", testSchemaVersion},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			store := newStore(t)
			defer store.Close()
			tt.test(t, store)
		})
	}
}

func testInitialize(t *testing.T, store Store) {
	ctx := context.Background()

	// Initialize should work
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	// Initialize again should be idempotent
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Second Initialize failed: %v", err)
	}
}

func testRevisions(t *testing.T, store Store) {
	ctx := context.Background()
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	// Create a revision
	rev := &Revision{
		GitHash:     "abc123def456",
		ChannelName: "nixos-unstable",
		CommitDate:  time.Now().UTC().Truncate(time.Second),
		OptionCount: 0,
	}

	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	if rev.ID == 0 {
		t.Error("Expected revision ID to be set")
	}

	// Get by git hash
	got, err := store.GetRevision(ctx, "abc123def456")
	if err != nil {
		t.Fatalf("GetRevision failed: %v", err)
	}
	if got == nil {
		t.Fatal("Expected revision, got nil")
	}
	if got.GitHash != rev.GitHash {
		t.Errorf("GitHash = %q, want %q", got.GitHash, rev.GitHash)
	}
	if got.ChannelName != rev.ChannelName {
		t.Errorf("ChannelName = %q, want %q", got.ChannelName, rev.ChannelName)
	}

	// Get by channel name
	got, err = store.GetRevisionByChannel(ctx, "nixos-unstable")
	if err != nil {
		t.Fatalf("GetRevisionByChannel failed: %v", err)
	}
	if got == nil {
		t.Fatal("Expected revision, got nil")
	}
	if got.ID != rev.ID {
		t.Errorf("ID = %d, want %d", got.ID, rev.ID)
	}

	// Get non-existent
	got, err = store.GetRevision(ctx, "nonexistent")
	if err != nil {
		t.Fatalf("GetRevision for nonexistent failed: %v", err)
	}
	if got != nil {
		t.Error("Expected nil for nonexistent revision")
	}

	// List revisions
	revs, err := store.ListRevisions(ctx)
	if err != nil {
		t.Fatalf("ListRevisions failed: %v", err)
	}
	if len(revs) != 1 {
		t.Errorf("Expected 1 revision, got %d", len(revs))
	}

	// Update option count
	if err := store.UpdateRevisionOptionCount(ctx, rev.ID, 100); err != nil {
		t.Fatalf("UpdateRevisionOptionCount failed: %v", err)
	}
	got, _ = store.GetRevision(ctx, "abc123def456")
	if got.OptionCount != 100 {
		t.Errorf("OptionCount = %d, want 100", got.OptionCount)
	}

	// Delete revision
	if err := store.DeleteRevision(ctx, rev.ID); err != nil {
		t.Fatalf("DeleteRevision failed: %v", err)
	}

	revs, _ = store.ListRevisions(ctx)
	if len(revs) != 0 {
		t.Errorf("Expected 0 revisions after delete, got %d", len(revs))
	}
}

func testOptions(t *testing.T, store Store) {
	ctx := context.Background()
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	// Create a revision first
	rev := &Revision{GitHash: "test123", ChannelName: "test"}
	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	// Create an option
	opt := &Option{
		RevisionID:   rev.ID,
		Name:         "services.nginx.enable",
		ParentPath:   "services.nginx",
		Type:         "boolean",
		DefaultValue: "false",
		Description:  "Whether to enable nginx.",
		ReadOnly:     false,
	}

	if err := store.CreateOption(ctx, opt); err != nil {
		t.Fatalf("CreateOption failed: %v", err)
	}

	if opt.ID == 0 {
		t.Error("Expected option ID to be set")
	}

	// Get option
	got, err := store.GetOption(ctx, rev.ID, "services.nginx.enable")
	if err != nil {
		t.Fatalf("GetOption failed: %v", err)
	}
	if got == nil {
		t.Fatal("Expected option, got nil")
	}
	if got.Name != opt.Name {
		t.Errorf("Name = %q, want %q", got.Name, opt.Name)
	}
	if got.Type != opt.Type {
		t.Errorf("Type = %q, want %q", got.Type, opt.Type)
	}
	if got.Description != opt.Description {
		t.Errorf("Description = %q, want %q", got.Description, opt.Description)
	}

	// Get non-existent option
	got, err = store.GetOption(ctx, rev.ID, "nonexistent")
	if err != nil {
		t.Fatalf("GetOption for nonexistent failed: %v", err)
	}
	if got != nil {
		t.Error("Expected nil for nonexistent option")
	}

	// Batch create options
	opts := []*Option{
		{RevisionID: rev.ID, Name: "services.caddy.enable", ParentPath: "services.caddy", Type: "boolean"},
		{RevisionID: rev.ID, Name: "services.caddy.config", ParentPath: "services.caddy", Type: "string"},
	}
	if err := store.CreateOptionsBatch(ctx, opts); err != nil {
		t.Fatalf("CreateOptionsBatch failed: %v", err)
	}

	for _, o := range opts {
		if o.ID == 0 {
			t.Errorf("Expected option %q ID to be set", o.Name)
		}
	}
}

func testOptionsSearch(t *testing.T, store Store) {
	ctx := context.Background()
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	rev := &Revision{GitHash: "search123", ChannelName: "test"}
	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	opts := []*Option{
		{RevisionID: rev.ID, Name: "services.nginx.enable", ParentPath: "services.nginx", Type: "boolean", Description: "Enable the nginx web server"},
		{RevisionID: rev.ID, Name: "services.nginx.package", ParentPath: "services.nginx", Type: "package", Description: "Nginx package to use"},
		{RevisionID: rev.ID, Name: "services.caddy.enable", ParentPath: "services.caddy", Type: "boolean", Description: "Enable the caddy web server"},
		{RevisionID: rev.ID, Name: "programs.git.enable", ParentPath: "programs.git", Type: "boolean", Description: "Enable git version control"},
	}
	if err := store.CreateOptionsBatch(ctx, opts); err != nil {
		t.Fatalf("CreateOptionsBatch failed: %v", err)
	}

	// Search for "nginx"
	results, err := store.SearchOptions(ctx, rev.ID, "nginx", SearchFilters{})
	if err != nil {
		t.Fatalf("SearchOptions failed: %v", err)
	}
	if len(results) < 1 {
		t.Errorf("Expected at least 1 result for 'nginx', got %d", len(results))
	}

	// Search with namespace filter
	results, err = store.SearchOptions(ctx, rev.ID, "enable", SearchFilters{Namespace: "services"})
	if err != nil {
		t.Fatalf("SearchOptions with namespace failed: %v", err)
	}
	for _, r := range results {
		if r.Name[:8] != "services" {
			t.Errorf("Result %q doesn't match namespace filter", r.Name)
		}
	}

	// Search with type filter
	results, err = store.SearchOptions(ctx, rev.ID, "nginx", SearchFilters{Type: "boolean"})
	if err != nil {
		t.Fatalf("SearchOptions with type failed: %v", err)
	}
	for _, r := range results {
		if r.Type != "boolean" {
			t.Errorf("Result %q has type %q, expected boolean", r.Name, r.Type)
		}
	}

	// Search with limit
	results, err = store.SearchOptions(ctx, rev.ID, "enable", SearchFilters{Limit: 2})
	if err != nil {
		t.Fatalf("SearchOptions with limit failed: %v", err)
	}
	if len(results) > 2 {
		t.Errorf("Expected at most 2 results, got %d", len(results))
	}
}

func testOptionChildren(t *testing.T, store Store) {
	ctx := context.Background()
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	rev := &Revision{GitHash: "children123", ChannelName: "test"}
	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	// Create a hierarchy of options
	opts := []*Option{
		{RevisionID: rev.ID, Name: "services", ParentPath: "", Type: "attrsOf"},
		{RevisionID: rev.ID, Name: "services.nginx", ParentPath: "services", Type: "submodule"},
		{RevisionID: rev.ID, Name: "services.nginx.enable", ParentPath: "services.nginx", Type: "boolean"},
		{RevisionID: rev.ID, Name: "services.nginx.package", ParentPath: "services.nginx", Type: "package"},
		{RevisionID: rev.ID, Name: "services.caddy", ParentPath: "services", Type: "submodule"},
	}
	if err := store.CreateOptionsBatch(ctx, opts); err != nil {
		t.Fatalf("CreateOptionsBatch failed: %v", err)
	}

	// Get children of root
	children, err := store.GetChildren(ctx, rev.ID, "")
	if err != nil {
		t.Fatalf("GetChildren root failed: %v", err)
	}
	if len(children) != 1 {
		t.Errorf("Expected 1 root child, got %d", len(children))
	}
	if len(children) > 0 && children[0].Name != "services" {
		t.Errorf("Expected root child to be 'services', got %q", children[0].Name)
	}

	// Get children of services
	children, err = store.GetChildren(ctx, rev.ID, "services")
	if err != nil {
		t.Fatalf("GetChildren services failed: %v", err)
	}
	if len(children) != 2 {
		t.Errorf("Expected 2 children of services, got %d", len(children))
	}

	// Get children of services.nginx
	children, err = store.GetChildren(ctx, rev.ID, "services.nginx")
	if err != nil {
		t.Fatalf("GetChildren services.nginx failed: %v", err)
	}
	if len(children) != 2 {
		t.Errorf("Expected 2 children of services.nginx, got %d", len(children))
	}
}

func testDeclarations(t *testing.T, store Store) {
	ctx := context.Background()
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	rev := &Revision{GitHash: "decl123", ChannelName: "test"}
	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	opt := &Option{
		RevisionID: rev.ID,
		Name:       "services.nginx.enable",
		ParentPath: "services.nginx",
		Type:       "boolean",
	}
	if err := store.CreateOption(ctx, opt); err != nil {
		t.Fatalf("CreateOption failed: %v", err)
	}

	// Create declarations
	decl := &Declaration{
		OptionID: opt.ID,
		FilePath: "nixos/modules/services/web-servers/nginx/default.nix",
		Line:     42,
	}
	if err := store.CreateDeclaration(ctx, decl); err != nil {
		t.Fatalf("CreateDeclaration failed: %v", err)
	}

	if decl.ID == 0 {
		t.Error("Expected declaration ID to be set")
	}

	// Get declarations
	decls, err := store.GetDeclarations(ctx, opt.ID)
	if err != nil {
		t.Fatalf("GetDeclarations failed: %v", err)
	}
	if len(decls) != 1 {
		t.Fatalf("Expected 1 declaration, got %d", len(decls))
	}
	if decls[0].FilePath != decl.FilePath {
		t.Errorf("FilePath = %q, want %q", decls[0].FilePath, decl.FilePath)
	}
	if decls[0].Line != 42 {
		t.Errorf("Line = %d, want 42", decls[0].Line)
	}

	// Batch create
	batch := []*Declaration{
		{OptionID: opt.ID, FilePath: "file1.nix", Line: 10},
		{OptionID: opt.ID, FilePath: "file2.nix", Line: 20},
	}
	if err := store.CreateDeclarationsBatch(ctx, batch); err != nil {
		t.Fatalf("CreateDeclarationsBatch failed: %v", err)
	}

	decls, _ = store.GetDeclarations(ctx, opt.ID)
	if len(decls) != 3 {
		t.Errorf("Expected 3 declarations after batch, got %d", len(decls))
	}
}

func testFiles(t *testing.T, store Store) {
	ctx := context.Background()
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Initialize failed: %v", err)
	}

	rev := &Revision{GitHash: "files123", ChannelName: "test"}
	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	// Create a file
	file := &File{
		RevisionID: rev.ID,
		FilePath:   "nixos/modules/services/web-servers/nginx/default.nix",
		Extension:  ".nix",
		Content:    "{ config, lib, pkgs, ... }:\n\n# nginx module\n",
	}
	if err := store.CreateFile(ctx, file); err != nil {
		t.Fatalf("CreateFile failed: %v", err)
	}

	if file.ID == 0 {
		t.Error("Expected file ID to be set")
	}

	// Get file
	got, err := store.GetFile(ctx, rev.ID, "nixos/modules/services/web-servers/nginx/default.nix")
	if err != nil {
		t.Fatalf("GetFile failed: %v", err)
	}
	if got == nil {
		t.Fatal("Expected file, got nil")
	}
	if got.Content != file.Content {
		t.Errorf("Content mismatch")
	}
	if got.Extension != ".nix" {
		t.Errorf("Extension = %q, want .nix", got.Extension)
	}

	// Get non-existent file
	got, err = store.GetFile(ctx, rev.ID, "nonexistent.nix")
	if err != nil {
		t.Fatalf("GetFile for nonexistent failed: %v", err)
	}
	if got != nil {
		t.Error("Expected nil for nonexistent file")
	}

	// Batch create
	files := []*File{
		{RevisionID: rev.ID, FilePath: "file1.nix", Extension: ".nix", Content: "content1"},
		{RevisionID: rev.ID, FilePath: "file2.nix", Extension: ".nix", Content: "content2"},
	}
	if err := store.CreateFilesBatch(ctx, files); err != nil {
		t.Fatalf("CreateFilesBatch failed: %v", err)
	}

	for _, f := range files {
		if f.ID == 0 {
			t.Errorf("Expected file %q ID to be set", f.FilePath)
		}
	}
}

func testSchemaVersion(t *testing.T, store Store) {
	ctx := context.Background()

	// First initialization
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("First Initialize failed: %v", err)
	}

	// Create some data
	rev := &Revision{GitHash: "version123", ChannelName: "test"}
	if err := store.CreateRevision(ctx, rev); err != nil {
		t.Fatalf("CreateRevision failed: %v", err)
	}

	// Second initialization should preserve data (same version)
	if err := store.Initialize(ctx); err != nil {
		t.Fatalf("Second Initialize failed: %v", err)
	}

	got, err := store.GetRevision(ctx, "version123")
	if err != nil {
		t.Fatalf("GetRevision after second init failed: %v", err)
	}
	if got == nil {
		t.Error("Data should be preserved after second initialization")
	}
}

// TestParentPath tests the ParentPath helper function.
func TestParentPath(t *testing.T) {
	tests := []struct {
		name   string
		input  string
		expect string
	}{
		{"top level", "services", ""},
		{"one level", "services.nginx", "services"},
		{"two levels", "services.nginx.enable", "services.nginx"},
		{"three levels", "services.nginx.virtualHosts.default", "services.nginx.virtualHosts"},
		{"empty", "", ""},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := ParentPath(tt.input)
			if got != tt.expect {
				t.Errorf("ParentPath(%q) = %q, want %q", tt.input, got, tt.expect)
			}
		})
	}
}