package tools

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"

	"github.com/patriceckhart/zot/internal/core"
	"github.com/patriceckhart/zot/internal/provider"
)

// WriteTool writes content to a file, creating parent directories.
type WriteTool struct {
	CWD     string
	Sandbox *Sandbox
}

type writeArgs struct {
	Path    string `json:"path"`
	Content string `json:"content"`
}

const writeSchema = `{
  "type":"object",
  "properties":{
    "path":{"type":"string","description":"Path to the file to write (relative or absolute)"},
    "content":{"type":"string","description":"File contents. Overwrites any existing file."}
  },
  "required":["path","content"],
  "additionalProperties":false
}`

func (t *WriteTool) Name() string { return "write" }
func (t *WriteTool) Description() string {
	return "Write content to a file. Creates parent directories. Overwrites existing files."
}
func (t *WriteTool) Schema() json.RawMessage { return json.RawMessage(writeSchema) }

func (t *WriteTool) Execute(ctx context.Context, raw json.RawMessage, progress func(string)) (core.ToolResult, error) {
	var a writeArgs
	if err := json.Unmarshal(raw, &a); err != nil {
		return core.ToolResult{}, fmt.Errorf("invalid args: %w", err)
	}
	if a.Path == "" {
		return core.ToolResult{}, fmt.Errorf("path is required")
	}
	path := resolvePath(t.CWD, a.Path)
	if err := t.Sandbox.CheckPath(path); err != nil {
		return core.ToolResult{}, err
	}

	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		return core.ToolResult{}, err
	}
	if err := os.WriteFile(path, []byte(a.Content), 0o644); err != nil {
		return core.ToolResult{}, err
	}

	msg := fmt.Sprintf("wrote %d bytes to %s", len(a.Content), a.Path)
	return core.ToolResult{
		Content: []provider.Content{provider.TextBlock{Text: msg}},
		Details: map[string]any{"path": path, "bytes": len(a.Content)},
	}, nil
}