package file

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"git.yeij.top/AskaEth/Cyrene-Plugins/sdk"
)

type FilePlugin struct {
	sdk.BasePlugin
	dataDir string
}

func NewFilePlugin(dataDir string) *FilePlugin {
	if dataDir == "" {
		dataDir = "/tmp/cyrene_data"
	}
	return &FilePlugin{dataDir: dataDir}
}

func (p *FilePlugin) Metadata() sdk.PluginMetadata {
	return sdk.PluginMetadata{
		Name: "file", DisplayName: "File Operations", Version: "1.0.0",
		Description: "Sandboxed file operations: read, write, list, delete within DATA_DIR",
		Category: "system", Author: sdk.PluginAuthor{Name: "Cyrene Team"},
	}
}

func (p *FilePlugin) Tools() []sdk.Tool { return []sdk.Tool{&FileTool{dataDir: p.dataDir}} }

type FileTool struct {
	sdk.BaseTool
	dataDir string
}

func (t *FileTool) Definition() sdk.ToolDefinition {
	return sdk.ToolDefinition{
		ID: "file_ops", Name: "file_ops", DisplayName: "File Operations",
		Description: "File operations within a sandboxed data directory. Read, write, list, check existence, delete.",
		Category: "system", Complexity: sdk.ComplexitySimple,
		DangerLevel: "medium",
		Parameters: map[string]interface{}{
			"type": "object",
			"properties": map[string]interface{}{
				"action":  map[string]interface{}{"type": "string", "enum": []string{"read", "write", "list", "exists", "delete"}},
				"path":    map[string]interface{}{"type": "string"},
				"content": map[string]interface{}{"type": "string"},
			},
			"required": []string{"action", "path"},
		},
	}
}

func (t *FileTool) Validate(args map[string]interface{}) error {
	for _, k := range []string{"action", "path"} {
		if _, ok := args[k]; !ok {
			return fmt.Errorf("missing required parameter: %s", k)
		}
	}
	return nil
}

func (t *FileTool) safePath(p string) (string, error) {
	clean := filepath.Clean(p)
	abs, err := filepath.Abs(filepath.Join(t.dataDir, clean))
	if err != nil {
		return "", fmt.Errorf("path resolution failed: %w", err)
	}
	if !strings.HasPrefix(abs, filepath.Clean(t.dataDir)+string(os.PathSeparator)) && abs != filepath.Clean(t.dataDir) {
		return "", fmt.Errorf("path traversal denied: %s", p)
	}
	return abs, nil
}

func (t *FileTool) Execute(_ context.Context, args map[string]interface{}) (*sdk.ToolResult, error) {
	action, _ := args["action"].(string)
	pathStr, _ := args["path"].(string)

	safePath, err := t.safePath(pathStr)
	if err != nil {
		return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
	}

	switch action {
	case "read":
		info, err := os.Stat(safePath)
		if err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		if info.IsDir() {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: "cannot read a directory"}, nil
		}
		if info.Size() > 100*1024 {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: "file too large (>100KB)"}, nil
		}
		data, err := os.ReadFile(safePath)
		if err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		return &sdk.ToolResult{ToolName: "file_ops", Success: true, Output: string(data)}, nil

	case "write":
		content, _ := args["content"].(string)
		dir := filepath.Dir(safePath)
		if err := os.MkdirAll(dir, 0755); err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		if err := os.WriteFile(safePath, []byte(content), 0644); err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		return &sdk.ToolResult{ToolName: "file_ops", Success: true, Output: fmt.Sprintf("Written %d bytes to %s", len(content), pathStr)}, nil

	case "list":
		entries, err := os.ReadDir(safePath)
		if err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		var out strings.Builder
		for _, e := range entries {
			info, _ := e.Info()
			if e.IsDir() {
				out.WriteString(fmt.Sprintf("[DIR]  %s/\n", e.Name()))
			} else {
				out.WriteString(fmt.Sprintf("[FILE] %s (%d bytes)\n", e.Name(), info.Size()))
			}
		}
		return &sdk.ToolResult{ToolName: "file_ops", Success: true, Output: out.String()}, nil

	case "exists":
		info, err := os.Stat(safePath)
		if err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: true, Output: fmt.Sprintf("Path does not exist: %s", pathStr)}, nil
		}
		kind := "file"
		if info.IsDir() {
			kind = "directory"
		}
		return &sdk.ToolResult{ToolName: "file_ops", Success: true, Output: fmt.Sprintf("Path exists (%s): %s", kind, pathStr)}, nil

	case "delete":
		info, err := os.Stat(safePath)
		if err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		if info.IsDir() {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: "cannot delete a directory"}, nil
		}
		if err := os.Remove(safePath); err != nil {
			return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: err.Error()}, nil
		}
		return &sdk.ToolResult{ToolName: "file_ops", Success: true, Output: fmt.Sprintf("Deleted: %s", pathStr)}, nil
	}
	return &sdk.ToolResult{ToolName: "file_ops", Success: false, Error: "unknown action: " + action}, nil
}