using System;
using System.IO;
using System.Text;
using System.Text.Json;
using Notify.Interop;
using Notify.Ipc;
using Notify.Models;
using Notify.Serialization;
using Notify.Services;

namespace Notify.Cli;

/// <summary>
/// 钩子子命令实现：纯互操作 / IPC，绝不加载 Avalonia，做完即退出
/// </summary>
public static class CliRunner
{
    // UserPromptSubmit：记录前台窗口与 prompt
    public static int Save()
    {
        var input = ReadStdin();
        if (string.IsNullOrEmpty(input?.SessionId))
        {
            return 0;
        }

        var hwnd = Win32.GetForegroundWindow();

        // 前台是 Windows Terminal 时，记录当前标签的 RuntimeId
        var wtRuntimeId = WinTerminalTabs.IsWindowsTerminal(hwnd)
            ? WinTerminalTabs.GetSelectedTabRuntimeId(hwnd)
            : "";

        StateStore.Save(input.SessionId, new StateData
        {
            Hwnd = hwnd.ToInt64(),
            Prompt = input.Prompt ?? "",
            WtRuntimeId = wtRuntimeId,
            CallerExePath = ProcessTree.FindCallerExePath(),
        });
        return 0;
    }

    // Stop：任务完成通知，正文取本次 prompt
    public static int Notify()
    {
        var input = ReadStdin();
        if (string.IsNullOrEmpty(input?.SessionId))
        {
            return 0;
        }

        var state = StateStore.Load(input.SessionId);
        var message = !string.IsNullOrWhiteSpace(state?.Prompt) ? state!.Prompt : "Task completed";

        NotificationSpool.Deliver(new NotifyMessage
        {
            SessionId = input.SessionId,
            Title = "Claude Code",
            Message = Sanitize(message),
            InputMode = false,
            Sticky = false,
            TargetHwnd = state?.Hwnd ?? 0,
            WtRuntimeId = state?.WtRuntimeId,
            IconPath = state?.CallerExePath,
        });
        return 0;
    }

    // Notification / PreToolUse：需要输入，常驻显示
    public static int Input()
    {
        var input = ReadStdin();
        if (string.IsNullOrEmpty(input?.SessionId))
        {
            return 0;
        }

        // 过滤无需打扰的类型
        if (input.NotificationType is "auth_success" or "elicitation_complete" or "elicitation_response")
        {
            return 0;
        }

        var (title, message) = Resolve(input);
        var state = StateStore.Load(input.SessionId);

        NotificationSpool.Deliver(new NotifyMessage
        {
            SessionId = input.SessionId,
            Title = title,
            Message = Sanitize(message),
            InputMode = true,
            Sticky = true,
            TargetHwnd = state?.Hwnd ?? 0,
            WtRuntimeId = state?.WtRuntimeId,
            IconPath = state?.CallerExePath,
        });
        return 0;
    }

    // SessionEnd：清理会话状态
    public static int Cleanup()
    {
        var input = ReadStdin();
        if (!string.IsNullOrEmpty(input?.SessionId))
        {
            StateStore.Delete(input.SessionId);
        }

        return 0;
    }

    // 按 tool_name / notification_type 决定标题与正文，对齐原版语义
    private static (string Title, string Message) Resolve(HookInput input)
    {
        if (input.ToolName == "AskUserQuestion")
        {
            var msg = string.IsNullOrEmpty(input.Message) ? "Claude 在向你提问" : input.Message!;
            return ("Claude is Asking", msg);
        }

        if (input.ToolName == "ExitPlanMode")
        {
            return ("Plan Ready for Approval", "Claude 提交了一份计划，待批准");
        }

        var title = input.NotificationType switch
        {
            "permission_prompt" => "Permission Required",
            "idle_prompt" => "Claude is Waiting",
            "elicitation_dialog" => "MCP Asks",
            _ => "Input Required",
        };
        var message = string.IsNullOrEmpty(input.Message) ? "Claude needs your input" : input.Message!;
        return (title, message);
    }

    // 折叠换行/制表/多余空白为单行，避免撑乱 toast 布局（截断交给 toast 的省略号）
    private static string Sanitize(string s)
    {
        if (string.IsNullOrEmpty(s))
        {
            return s;
        }

        s = s.Replace('\r', ' ').Replace('\n', ' ').Replace('\t', ' ');
        while (s.Contains("  "))
        {
            s = s.Replace("  ", " ");
        }

        return s.Trim();
    }

    // 直接读原始字节并按 UTF-8 解码：WinExe 下 Console.In 不可靠，且其代码页
    // 会把中文解成乱码（GBK），这里绕开
    private static HookInput? ReadStdin()
    {
        try
        {
            using var stdin = Console.OpenStandardInput();
            using var ms = new MemoryStream();
            stdin.CopyTo(ms);

            var bytes = ms.ToArray();
            if (bytes.Length == 0)
            {
                return null;
            }

            var text = Encoding.UTF8.GetString(bytes).TrimStart('');
            if (string.IsNullOrWhiteSpace(text))
            {
                return null;
            }

            return JsonSerializer.Deserialize(text, AppJsonContext.Default.HookInput);
        }
        catch
        {
            return null;
        }
    }
}