refactor(utils): enhance cost handling and error management

- Introduce new types for RepoName and Cost.
- Add GetCosts function to read and parse cost data.
- Implement CostFileNotFoundError for better error handling.
- Refactor getRepoName to GetRepoName for consistency.

[Generated by Kommit]

Author: cowboy-bebug

internal/utils/cost.go

@@ -20,9 +20,31 @@ func costFilepath() string {
 	return filepath.Join(dir, "kommit", "cost.json")
 }
 
-type Cost struct {
-	RepoName string
-	Cost     float64
+type RepoName string
+type Cost float64
+type Costs map[RepoName]Cost
+
+func GetCosts() (Costs, error) {
+	costFilePath := costFilepath()
+	if costFilePath == "" {
+		return nil, fmt.Errorf("could not determine cost file path")
+	}
+
+	if _, err := os.Stat(costFilePath); os.IsNotExist(err) {
+		return nil, CostFileNotFoundError{}
+	}
+
+	costData, err := os.ReadFile(costFilePath)
+	if err != nil {
+		return nil, CostFileNotFoundError{}
+	}
+
+	var costs Costs
+	if err := json.Unmarshal(costData, &costs); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal cost data: %w", err)
+	}
+
+	return costs, nil
 }
 
 func UpdateCost(cost float64) error {
@@ -36,7 +58,7 @@ func UpdateCost(cost float64) error {
 		return fmt.Errorf("failed to create directory: %w", err)
 	}
 
-	repoName, err := getRepoName()
+	repoName, err := GetRepoName()
 	if err != nil {
 		return fmt.Errorf("failed to get repository name: %w", err)
 	}
@@ -62,7 +84,7 @@ func UpdateCost(cost float64) error {
 	return nil
 }
 
-func getRepoName() (string, error) {
+func GetRepoName() (string, error) {
 	fullPath, err := ExecGit("rev-parse", "--show-toplevel")
 	if err != nil {
 		return "", err

internal/utils/errors.go

@@ -16,3 +16,9 @@ func (e UnsupportedModelError) Is(target error) bool {
 	_, ok := target.(UnsupportedModelError)
 	return ok
 }
+
+type CostFileNotFoundError struct{}
+
+func (e CostFileNotFoundError) Error() string {
+	return "Cost file not found"
+}