package config

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

	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
)

func TestChunkCacheDefaults(t *testing.T) {
	cfg := Default()
	if cfg.Workspace.ChunkCache.Mode != pipeline.ChunkCacheAuto || cfg.Workspace.ChunkCache.Directory != "" {
		t.Fatalf("chunk cache defaults = %#v", cfg.Workspace.ChunkCache)
	}
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
}

func TestChunkCacheFileConfiguration(t *testing.T) {
	cfg := parseAndApplyConfig(t, `
version: 2
workspace:
  chunk_cache:
    mode: refresh
    directory: " ./state/../plans "
`)
	if cfg.Workspace.ChunkCache.Mode != pipeline.ChunkCacheRefresh {
		t.Fatalf("mode = %q", cfg.Workspace.ChunkCache.Mode)
	}
	if got, want := cfg.Workspace.ChunkCache.Directory, filepath.Clean("./state/../plans"); got != want {
		t.Fatalf("directory = %q, want %q", got, want)
	}
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
}

func TestChunkCacheEnvironmentOverridesFile(t *testing.T) {
	fileCfg, err := ParseFileConfigYAML([]byte(`
version: 2
workspace:
  chunk_cache:
    mode: bypass
    directory: /file/plans
`))
	if err != nil {
		t.Fatal(err)
	}
	cfg := Default()
	if err := cfg.ApplyFileConfigWithLookup(fileCfg, emptyLookup); err != nil {
		t.Fatal(err)
	}
	if err := cfg.ApplyEnvOverridesWithLookup(mapLookup(map[string]string{
		"NOTARIUS_WORKSPACE_CHUNK_CACHE_MODE": "refresh",
		"NOTARIUS_WORKSPACE_CHUNK_CACHE_DIR":  " /environment/../cache/plans ",
	})); err != nil {
		t.Fatal(err)
	}
	if cfg.Workspace.ChunkCache.Mode != pipeline.ChunkCacheRefresh || cfg.Workspace.ChunkCache.Directory != filepath.Clean("/environment/../cache/plans") {
		t.Fatalf("effective chunk cache = %#v", cfg.Workspace.ChunkCache)
	}
}

func TestChunkCacheEmptyDirectoryEnvironmentSelectsDefault(t *testing.T) {
	cfg := Default()
	cfg.Workspace.ChunkCache.Directory = "/file/plans"
	if err := cfg.ApplyEnvOverridesWithLookup(mapLookup(map[string]string{"NOTARIUS_WORKSPACE_CHUNK_CACHE_DIR": " \t "})); err != nil {
		t.Fatal(err)
	}
	if cfg.Workspace.ChunkCache.Directory != "" {
		t.Fatalf("directory = %q, want unset", cfg.Workspace.ChunkCache.Directory)
	}
}

func TestChunkCacheRejectsInvalidSuppliedModes(t *testing.T) {
	fileCfg, err := ParseFileConfigYAML([]byte("version: 2\nworkspace:\n  chunk_cache:\n    mode: sometimes\n"))
	if err != nil {
		t.Fatal(err)
	}
	cfg := Default()
	if err := cfg.ApplyFileConfigWithLookup(fileCfg, emptyLookup); err == nil || !strings.Contains(err.Error(), "workspace.chunk_cache.mode") {
		t.Fatalf("file mode error = %v", err)
	}

	cfg = Default()
	if err := cfg.ApplyEnvOverridesWithLookup(mapLookup(map[string]string{"NOTARIUS_WORKSPACE_CHUNK_CACHE_MODE": "sometimes"})); err == nil || !strings.Contains(err.Error(), "NOTARIUS_WORKSPACE_CHUNK_CACHE_MODE") {
		t.Fatalf("environment mode error = %v", err)
	}

	cfg = Default()
	cfg.Workspace.ChunkCache.Mode = "sometimes"
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "chunk cache") {
		t.Fatalf("Validate() error = %v", err)
	}
}

func TestChunkCacheConfigurationClonesAndRedacts(t *testing.T) {
	cfg := Default()
	cfg.Workspace.ChunkCache = WorkspaceChunkCacheConfig{Mode: pipeline.ChunkCacheRefresh, Directory: "/var/cache/notarius/chunk-plans"}
	cloned := cloneConfig(cfg)
	redacted := cfg.Redacted()
	if cloned.Workspace.ChunkCache != cfg.Workspace.ChunkCache || redacted.Workspace.ChunkCache != cfg.Workspace.ChunkCache {
		t.Fatalf("cloned=%#v redacted=%#v", cloned.Workspace.ChunkCache, redacted.Workspace.ChunkCache)
	}
	redacted.Workspace.ChunkCache.Directory = "/changed"
	if cfg.Workspace.ChunkCache.Directory != "/var/cache/notarius/chunk-plans" {
		t.Fatal("redacted mutation changed original")
	}
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
}

func TestChunkCacheDirectoryValidation(t *testing.T) {
	cfg := Default()
	cfg.Workspace.ChunkCache.Directory = "/var/cache/notarius/chunk-plans"
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate(system root) error = %v", err)
	}
	cfg.Workspace.ChunkCache.Directory = "bad\x00path"
	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "NUL") {
		t.Fatalf("Validate(NUL directory) error = %v", err)
	}
}