u4: add core infrastructure scaffolding

1 files changed, 148 insertions, 0 deletions

diff --git a/internal/config/config_test.go b/internal/config/config_test.go
new file mode 100644
index 0000000..d0a4efe
--- /dev/null
+++ b/internal/config/config_test.go
@@ -0,0 +1,148 @@
+package config
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"codeberg.org/snonux/comicforge/internal/provider"
+)
+
+func TestLoadReturnsDefaultsWhenConfigMissing(t *testing.T) {
+	t.Parallel()
+
+	cfg, err := Load("")
+	if err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+
+	if got, want := cfg.Provider.Text, provider.Gemini; got != want {
+		t.Fatalf("Provider.Text = %q, want %q", got, want)
+	}
+	if got, want := cfg.PromptsDir, DefaultPromptsDir; got != want {
+		t.Fatalf("PromptsDir = %q, want %q", got, want)
+	}
+}
+
+func TestLoadReadsFileAndEnvOverrides(t *testing.T) {
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "config.yaml")
+	if err := os.WriteFile(configPath, []byte(strings.TrimSpace(`
+provider:
+  text: openai
+  image: openai
+  tts: openai
+prompts_dir: ./custom-prompts
+comic:
+  story_pages: 7
+`)), 0o644); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	t.Setenv("COMICFORGE_PROVIDER_TEXT", "gemini")
+
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+
+	if got, want := cfg.Provider.Text, provider.Gemini; got != want {
+		t.Fatalf("Provider.Text = %q, want %q", got, want)
+	}
+	if got, want := cfg.Provider.Image, provider.OpenAI; got != want {
+		t.Fatalf("Provider.Image = %q, want %q", got, want)
+	}
+	if got, want := cfg.Comic.StoryPages, 7; got != want {
+		t.Fatalf("Comic.StoryPages = %d, want %d", got, want)
+	}
+	if got, want := cfg.PromptsDir, "./custom-prompts"; got != want {
+		t.Fatalf("PromptsDir = %q, want %q", got, want)
+	}
+}
+
+func TestRenderPrompt(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	cfg := DefaultConfig()
+	cfg.PromptsDir = tmpDir
+
+	if err := os.WriteFile(filepath.Join(tmpDir, "story.md"), []byte("{{.Word}} -> {{.Translation}}"), 0o644); err != nil {
+		t.Fatalf("write prompt: %v", err)
+	}
+
+	got, err := cfg.RenderPrompt("story.md", map[string]string{
+		"Word":        "ябълка",
+		"Translation": "apple",
+	})
+	if err != nil {
+		t.Fatalf("RenderPrompt() error = %v", err)
+	}
+	if got != "ябълка -> apple" {
+		t.Fatalf("RenderPrompt() = %q, want %q", got, "ябълка -> apple")
+	}
+}
+
+func TestRenderPromptMissingKeyReturnsError(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	cfg := DefaultConfig()
+	cfg.PromptsDir = tmpDir
+
+	if err := os.WriteFile(filepath.Join(tmpDir, "story.md"), []byte("{{.Word}} -> {{.Translation}}"), 0o644); err != nil {
+		t.Fatalf("write prompt: %v", err)
+	}
+
+	_, err := cfg.RenderPrompt("story.md", map[string]string{"Word": "ябълка"})
+	if err == nil {
+		t.Fatal("RenderPrompt() error = nil, want error")
+	}
+	if !strings.Contains(err.Error(), "render prompt") {
+		t.Fatalf("RenderPrompt() error = %v, want wrapped render error", err)
+	}
+}
+
+func TestLoadRejectsUnknownProvider(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "config.yaml")
+	if err := os.WriteFile(configPath, []byte(strings.TrimSpace(`
+provider:
+  text: mystery
+`)), 0o644); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	_, err := Load(configPath)
+	if err == nil {
+		t.Fatal("Load() error = nil, want error")
+	}
+	if !strings.Contains(err.Error(), "unknown text provider") {
+		t.Fatalf("Load() error = %v, want unknown provider error", err)
+	}
+}
+
+func TestHomeDirReturnsFallbackWhenResolutionFails(t *testing.T) {
+	t.Parallel()
+
+	oldUserHomeDir := userHomeDir
+	t.Cleanup(func() {
+		userHomeDir = oldUserHomeDir
+	})
+
+	userHomeDir = func() (string, error) {
+		return "", errors.New("boom")
+	}
+
+	homeDir, err := HomeDir()
+	if err == nil {
+		t.Fatal("HomeDir() error = nil, want error")
+	}
+	if homeDir != "." {
+		t.Fatalf("HomeDir() homeDir = %q, want %q", homeDir, ".")
+	}
+}