package volume

import (
	"path/filepath"
	"strings"
	"testing"

	"github.com/alexei/tinyforge/internal/store"
)

func TestResolveWorkloadPath(t *testing.T) {
	// Use real-OS absolute paths so the suite is portable Linux/Windows.
	allowedDir := t.TempDir()
	allowedJSON := `["` + filepath.ToSlash(allowedDir) + `"]`
	bindSource := filepath.Join(allowedDir, "db")
	outsideSource := filepath.Join(t.TempDir(), "passwd")

	const base = "/var/forge/volumes"

	type tc struct {
		name    string
		vol     store.WorkloadVolume
		params  ResolveWorkloadParams
		want    string
		wantErr string // substring match; empty = no error
	}

	cases := []tc{
		{
			name: "absolute allowed",
			vol:  store.WorkloadVolume{Source: bindSource, Scope: "absolute"},
			params: ResolveWorkloadParams{
				BasePath:           base,
				WorkloadID:         "01abcdef1234",
				WorkloadName:       "api",
				AllowedVolumePaths: allowedJSON,
			},
			want: filepath.Clean(bindSource),
		},
		{
			name: "absolute outside allow-list",
			vol:  store.WorkloadVolume{Source: outsideSource, Scope: "absolute"},
			params: ResolveWorkloadParams{
				BasePath:           base,
				WorkloadID:         "01abcdef1234",
				AllowedVolumePaths: allowedJSON,
			},
			wantErr: "not under any allowed",
		},
		{
			name: "absolute requires non-empty source",
			vol:  store.WorkloadVolume{Source: "", Scope: "absolute"},
			params: ResolveWorkloadParams{
				BasePath:           base,
				AllowedVolumePaths: allowedJSON,
			},
			wantErr: "absolute scope requires a source path",
		},
		{
			name: "ephemeral has no host path",
			vol:  store.WorkloadVolume{Scope: "ephemeral"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef", WorkloadName: "api",
			},
			wantErr: "ephemeral",
		},
		{
			name: "instance uses tag suffix",
			vol:  store.WorkloadVolume{Source: "data", Scope: "instance"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api", ImageTag: "v1.2.3",
			},
			want: filepath.Join(base, "api-01abcdef", "instance-v1.2.3", "data"),
		},
		{
			name: "instance scope requires tag",
			vol:  store.WorkloadVolume{Source: "data", Scope: "instance"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef", WorkloadName: "api",
			},
			wantErr: "instance scope requires image tag",
		},
		{
			name: "stage and project collapse to workload dir",
			vol:  store.WorkloadVolume{Source: "shared", Scope: "stage"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			want: filepath.Join(base, "api-01abcdef", "shared"),
		},
		{
			name: "project scope",
			vol:  store.WorkloadVolume{Source: "shared", Scope: "project"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			want: filepath.Join(base, "api-01abcdef", "shared"),
		},
		{
			name: "project_named requires name",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project_named"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			wantErr: "project_named scope requires name",
		},
		{
			name: "project_named",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project_named", Name: "cache"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			want: filepath.Join(base, "api-01abcdef", "_named", "cache", "data"),
		},
		{
			name: "named",
			vol:  store.WorkloadVolume{Source: "data", Scope: "named", Name: "global-cache"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			want: filepath.Join(base, "_named", "global-cache", "data"),
		},
		{
			name: "named requires name",
			vol:  store.WorkloadVolume{Source: "data", Scope: "named"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			wantErr: "named scope requires name",
		},
		{
			name: "empty scope rejected",
			vol:  store.WorkloadVolume{Source: "data", Scope: ""},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			wantErr: "scope is required",
		},
		{
			name: "unknown scope rejected",
			vol:  store.WorkloadVolume{Source: "data", Scope: "weird"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api",
			},
			wantErr: "unknown volume scope",
		},
		{
			name: "id-only workload still resolves",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234",
			},
			want: filepath.Join(base, "01abcdef", "data"),
		},
		{
			name: "name-only workload still resolves",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadName: "api",
			},
			want: filepath.Join(base, "api", "data"),
		},
		{
			name: "name with unsafe chars sanitized",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project"},
			params: ResolveWorkloadParams{
				BasePath: base, WorkloadID: "01abcdef1234", WorkloadName: "api/../etc",
			},
			want: filepath.Join(base, "api-..-etc-01abcdef", "data"),
		},
		{
			name: "no workload identity rejected",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project"},
			params: ResolveWorkloadParams{
				BasePath: base,
			},
			wantErr: "workload id or name required",
		},
		{
			name: "non-absolute scope requires base path",
			vol:  store.WorkloadVolume{Source: "data", Scope: "project"},
			params: ResolveWorkloadParams{
				WorkloadID: "01abcdef", WorkloadName: "api",
			},
			wantErr: "base path is required",
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got, err := ResolveWorkloadPath(c.vol, c.params)
			if c.wantErr != "" {
				if err == nil {
					t.Fatalf("want error containing %q, got nil (path=%q)", c.wantErr, got)
				}
				if !strings.Contains(err.Error(), c.wantErr) {
					t.Fatalf("want error containing %q, got %q", c.wantErr, err.Error())
				}
				return
			}
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			if got != c.want {
				t.Fatalf("path mismatch:\n  got  %q\n  want %q", got, c.want)
			}
		})
	}
}

func TestSanitizePathSegment(t *testing.T) {
	cases := []struct {
		in, out string
	}{
		{"api", "api"},
		{"  api  ", "api"},
		{"api/../etc", "api-..-etc"},
		{"my app v1", "my-app-v1"},
		{"---", ""},
		{"", ""},
		{"v1.2.3", "v1.2.3"},
	}
	for _, c := range cases {
		got := sanitizePathSegment(c.in)
		if got != c.out {
			t.Errorf("sanitize(%q) = %q, want %q", c.in, got, c.out)
		}
	}
}