package apperrors

import (
	"runtime"
	"testing"

	"github.com/ivuorinen/gh-action-readme/appconstants"
	"github.com/ivuorinen/gh-action-readme/testutil"
)

// Test helper factories for creating context maps

func ctxPath(path string) map[string]string {
	return map[string]string{"path": path}
}

func ctxError(err string) map[string]string {
	return map[string]string{"error": err}
}

func ctxStatusCode(code string) map[string]string {
	return map[string]string{"status_code": code}
}

func ctxEmpty() map[string]string {
	return map[string]string{}
}

func TestGetSuggestions(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		code     appconstants.ErrorCode
		context  map[string]string
		contains []string
	}{
		{
			name:    "file not found with path",
			code:    appconstants.ErrCodeFileNotFound,
			context: ctxPath("/path/to/action.yml"),
			contains: []string{
				"Check if the file exists: /path/to/action.yml",
				"Verify the file path is correct",
				"--recursive flag",
			},
		},
		{
			name:    "file not found action file",
			code:    appconstants.ErrCodeFileNotFound,
			context: ctxPath("/project/action.yml"),
			contains: []string{
				"Common action file names: action.yml, action.yaml",
				"Check if the file is in a subdirectory",
			},
		},
		{
			name:    "permission denied",
			code:    appconstants.ErrCodePermission,
			context: ctxPath("/restricted/file.txt"),
			contains: []string{
				"Check file permissions: ls -la /restricted/file.txt",
				"chmod 644 /restricted/file.txt",
			},
		},
		{
			name: "invalid YAML with line number",
			code: appconstants.ErrCodeInvalidYAML,
			context: map[string]string{
				"line": "25",
			},
			contains: []string{
				"Error near line 25",
				"Check YAML indentation",
				"use spaces, not tabs",
				"YAML validator",
			},
		},
		{
			name:    "invalid YAML with tab error",
			code:    appconstants.ErrCodeInvalidYAML,
			context: ctxError("found character that cannot start any token (tab)"),
			contains: []string{
				"YAML files must use spaces for indentation, not tabs",
				"Replace all tabs with spaces",
			},
		},
		{
			name: "invalid action with missing fields",
			code: appconstants.ErrCodeInvalidAction,
			context: map[string]string{
				"missing_fields": "name, description",
			},
			contains: []string{
				"Missing required fields: name, description",
				"required fields: name, description",
				"gh-action-readme schema",
			},
		},
		{
			name: "no action files",
			code: appconstants.ErrCodeNoActionFiles,
			context: map[string]string{
				"directory": "/project",
			},
			contains: []string{
				"Current directory: /project",
				"find /project -name 'action.y*ml'",
				"--recursive flag",
				"action.yml or action.yaml",
			},
		},
		{
			name:    "GitHub API 401 error",
			code:    appconstants.ErrCodeGitHubAPI,
			context: ctxStatusCode("401"),
			contains: []string{
				"Authentication failed",
				"check your GitHub token",
				"Token may be expired",
			},
		},
		{
			name:    "GitHub API 403 error",
			code:    appconstants.ErrCodeGitHubAPI,
			context: ctxStatusCode("403"),
			contains: []string{
				"Access forbidden",
				"check token permissions",
				"rate limit",
			},
		},
		{
			name:    "GitHub API 404 error",
			code:    appconstants.ErrCodeGitHubAPI,
			context: ctxStatusCode("404"),
			contains: []string{
				"Repository or resource not found",
				"repository is private",
			},
		},
		{
			name:    "GitHub rate limit",
			code:    appconstants.ErrCodeGitHubRateLimit,
			context: ctxEmpty(),
			contains: []string{
				"rate limit exceeded",
				"GITHUB_TOKEN",
				"gh auth login",
				"Rate limits reset every hour",
			},
		},
		{
			name:    "GitHub auth",
			code:    appconstants.ErrCodeGitHubAuth,
			context: ctxEmpty(),
			contains: []string{
				"export GITHUB_TOKEN",
				"gh auth login",
				"https://github.com/settings/tokens",
				"'repo' scope",
			},
		},
		{
			name: "configuration error with path",
			code: appconstants.ErrCodeConfiguration,
			context: map[string]string{
				"config_path": "~/.config/gh-action-readme/config.yaml",
			},
			contains: []string{
				"Config path: ~/.config/gh-action-readme/config.yaml",
				"ls -la ~/.config/gh-action-readme/config.yaml",
				"gh-action-readme config init",
			},
		},
		{
			name: "validation error with invalid fields",
			code: appconstants.ErrCodeValidation,
			context: map[string]string{
				"invalid_fields": "runs.using, inputs.test",
			},
			contains: []string{
				"Invalid fields: runs.using, inputs.test",
				"Check spelling and nesting",
				"gh-action-readme schema",
			},
		},
		{
			name: "template error with theme",
			code: appconstants.ErrCodeTemplateRender,
			context: map[string]string{
				"theme": "custom",
			},
			contains: []string{
				"Current theme: custom",
				"Try using a different theme",
				"Available themes:",
			},
		},
		{
			name: "file write error with output path",
			code: appconstants.ErrCodeFileWrite,
			context: map[string]string{
				"output_path": "/output/README.md",
			},
			contains: []string{
				"Output directory: /output",
				"Check permissions: ls -la /output",
				"mkdir -p /output",
			},
		},
		{
			name: "dependency analysis error",
			code: appconstants.ErrCodeDependencyAnalysis,
			context: map[string]string{
				"action": "my-action",
			},
			contains: []string{
				"Analyzing action: my-action",
				"GitHub token is set",
				"composite actions",
			},
		},
		{
			name: "cache access error",
			code: appconstants.ErrCodeCacheAccess,
			context: map[string]string{
				"cache_path": "~/.cache/gh-action-readme",
			},
			contains: []string{
				"Cache path: ~/.cache/gh-action-readme",
				"gh-action-readme cache clear",
				"permissions: ls -la ~/.cache/gh-action-readme",
			},
		},
		{
			name:    "unknown error code",
			code:    "UNKNOWN_TEST_CODE",
			context: ctxEmpty(),
			contains: []string{
				"Check the error message",
				"--verbose flag",
				"project documentation",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			suggestions := GetSuggestions(tt.code, tt.context)
			testutil.AssertSliceContainsAll(t, suggestions, tt.contains)
		})
	}
}

func TestGetPermissionSuggestionsOSSpecific(t *testing.T) {
	t.Parallel()

	context := map[string]string{"path": "/test/file"}
	suggestions := getPermissionSuggestions(context)

	switch runtime.GOOS {
	case "windows":
		testutil.AssertSliceContainsAll(t, suggestions, []string{"Administrator", "Windows file permissions"})
	default:
		testutil.AssertSliceContainsAll(t, suggestions, []string{"sudo", "ls -la"})
	}
}

func TestGetSuggestionsEmptyContext(t *testing.T) {
	t.Parallel()

	// Test that all error codes work with empty context
	errorCodes := []appconstants.ErrorCode{
		appconstants.ErrCodeFileNotFound,
		appconstants.ErrCodePermission,
		appconstants.ErrCodeInvalidYAML,
		appconstants.ErrCodeInvalidAction,
		appconstants.ErrCodeNoActionFiles,
		appconstants.ErrCodeGitHubAPI,
		appconstants.ErrCodeGitHubRateLimit,
		appconstants.ErrCodeGitHubAuth,
		appconstants.ErrCodeConfiguration,
		appconstants.ErrCodeValidation,
		appconstants.ErrCodeTemplateRender,
		appconstants.ErrCodeFileWrite,
		appconstants.ErrCodeDependencyAnalysis,
		appconstants.ErrCodeCacheAccess,
	}

	for _, code := range errorCodes {
		t.Run(string(code), func(t *testing.T) {
			t.Parallel()

			suggestions := GetSuggestions(code, map[string]string{})
			if len(suggestions) == 0 {
				t.Errorf("GetSuggestions(%s, {}) returned empty slice", code)
			}
		})
	}
}

func TestGetFileNotFoundSuggestionsActionFile(t *testing.T) {
	t.Parallel()

	context := map[string]string{
		"path": "/project/action.yml",
	}

	suggestions := getFileNotFoundSuggestions(context)
	testutil.AssertSliceContainsAll(t, suggestions, []string{"action.yml, action.yaml", "subdirectory"})
}

func TestGetInvalidYAMLSuggestionsTabError(t *testing.T) {
	t.Parallel()

	context := map[string]string{
		"error": "found character that cannot start any token, tab character",
	}

	suggestions := getInvalidYAMLSuggestions(context)
	testutil.AssertSliceContainsAll(t, suggestions, []string{"tabs with spaces"})
}

func TestGetGitHubAPISuggestionsStatusCodes(t *testing.T) {
	t.Parallel()

	statusCodes := map[string]string{
		"401": "Authentication failed",
		"403": "Access forbidden",
		"404": "not found",
	}

	for code, expectedText := range statusCodes {
		t.Run("status_"+code, func(t *testing.T) {
			t.Parallel()

			context := map[string]string{"status_code": code}
			suggestions := getGitHubAPISuggestions(context)
			testutil.AssertSliceContainsAll(t, suggestions, []string{expectedText})
		})
	}
}