using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.ComponentModel.DataAnnotations;
using WIDESEAWCS_S7Simulator.Core.Entities;
using WIDESEAWCS_S7Simulator.Core.Enums;

namespace WIDESEAWCS_S7Simulator.Web.Pages;

/// <summary>
/// 编辑实例页
/// </summary>
public class EditModel : PageModel
{
    private readonly ILogger<EditModel> _logger;
    private readonly IHttpClientFactory _httpClientFactory;

    public EditModel(ILogger<EditModel> logger, IHttpClientFactory httpClientFactory)
    {
        _logger = logger;
        _httpClientFactory = httpClientFactory;
    }

    [BindProperty]
    public EditInstanceInputModel Input { get; set; } = new();

    public InstanceState? CurrentInstance { get; private set; }

    public bool IsRunning { get; private set; }

    public async Task<IActionResult> OnGetAsync(string id)
    {
        if (string.IsNullOrWhiteSpace(id))
        {
            return BadRequest("实例ID不能为空");
        }

        try
        {
            var httpClient = _httpClientFactory.CreateClient();
            httpClient.BaseAddress = new Uri($"{Request.Scheme}://{Request.Host}");

            var response = await httpClient.GetAsync($"/api/SimulatorInstances/{Uri.EscapeDataString(id)}");

            if (response.IsSuccessStatusCode)
            {
                CurrentInstance = await response.Content.ReadFromJsonAsync<InstanceState>();
                IsRunning = CurrentInstance?.Status == InstanceStatus.Running;

                // Load existing config
                var configResponse = await httpClient.GetAsync($"/api/SimulatorInstances");
                if (configResponse.IsSuccessStatusCode)
                {
                    var allInstances = await configResponse.Content.ReadFromJsonAsync<List<InstanceState>>();
                    // For now, we'll initialize with defaults. In production, you'd have a separate endpoint to get instance config
                }

                // Initialize input with current values (default for now)
                Input.Id = id;
                Input.Name = CurrentInstance?.InstanceId ?? id;
                Input.Port = 102; // Default
            }
            else if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
            {
                return NotFound($"实例 \"{id}\" 不存在");
            }
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to load instance {InstanceId}", id);
            ModelState.AddModelError(string.Empty, "加载实例失败，请稍后重试");
        }

        return Page();
    }

    public async Task<IActionResult> OnPostAsync()
    {
        if (!ModelState.IsValid)
        {
            // Reload instance state
            await LoadInstanceStateAsync(Input.Id);
            return Page();
        }

        try
        {
            // 创建HttpClient并设置BaseAddress
            var httpClient = _httpClientFactory.CreateClient();
            httpClient.BaseAddress = new Uri($"{Request.Scheme}://{Request.Host}");

            var config = new InstanceConfig
            {
                Id = Input.Id,
                Name = Input.Name,
                PLCType = Input.PLCType,
                Port = Input.Port,
                ActivationKey = Input.ActivationKey ?? string.Empty,
                AutoStart = Input.AutoStart,
                MemoryConfig = new MemoryRegionConfig
                {
                    MRegionSize = Input.MRegionSize > 0 ? Input.MRegionSize : 1024,
                    DBBlockCount = Input.DBBlockCount > 0 ? Input.DBBlockCount : 100,
                    DBBlockSize = Input.DBBlockSize > 0 ? Input.DBBlockSize : 1024,
                    IRegionSize = Input.IRegionSize > 0 ? Input.IRegionSize : 256,
                    QRegionSize = Input.QRegionSize > 0 ? Input.QRegionSize : 256,
                    TRegionCount = Input.TRegionCount > 0 ? Input.TRegionCount : 64,
                    CRegionCount = Input.CRegionCount > 0 ? Input.CRegionCount : 64
                }
            };

            var response = await httpClient.PutAsJsonAsync($"/api/SimulatorInstances/{Uri.EscapeDataString(Input.Id)}", config);

            if (response.IsSuccessStatusCode)
            {
                _logger.LogInformation("Instance {InstanceId} updated successfully", Input.Id);
                TempData["SuccessMessage"] = $"实例 \"{Input.Id}\" 更新成功!";
                return RedirectToPage("/Index");
            }
            else if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
            {
                ModelState.AddModelError(string.Empty, "实例不存在");
            }
            else
            {
                var error = await response.Content.ReadFromJsonAsync<object>();
                ModelState.AddModelError(string.Empty, error?.ToString() ?? "更新实例失败");
            }
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to update instance");
            ModelState.AddModelError(string.Empty, "网络错误，请稍后重试");
        }

        await LoadInstanceStateAsync(Input.Id);
        return Page();
    }

    private async Task LoadInstanceStateAsync(string id)
    {
        try
        {
            var httpClient = _httpClientFactory.CreateClient();
            httpClient.BaseAddress = new Uri($"{Request.Scheme}://{Request.Host}");

            var response = await httpClient.GetAsync($"/api/SimulatorInstances/{Uri.EscapeDataString(id)}");
            if (response.IsSuccessStatusCode)
            {
                CurrentInstance = await response.Content.ReadFromJsonAsync<InstanceState>();
                IsRunning = CurrentInstance?.Status == InstanceStatus.Running;
            }
        }
        catch
        {
            // Ignore errors when reloading state
        }
    }

    /// <summary>
    /// 编辑实例输入模型
    /// </summary>
    public class EditInstanceInputModel
    {
        public string Id { get; set; } = string.Empty;

        [Required(ErrorMessage = "实例名称不能为空")]
        [StringLength(100, ErrorMessage = "实例名称不能超过100个字符")]
        public string Name { get; set; } = string.Empty;

        [Required(ErrorMessage = "PLC型号不能为空")]
        public SiemensPLCType PLCType { get; set; } = SiemensPLCType.S71200;

        [Required(ErrorMessage = "端口不能为空")]
        [Range(1, 65535, ErrorMessage = "端口必须在1-65535之间")]
        public int Port { get; set; } = 102;

        [StringLength(200, ErrorMessage = "激活码不能超过200个字符")]
        public string? ActivationKey { get; set; }

        public bool AutoStart { get; set; } = false;

        // 内存配置
        public int MRegionSize { get; set; }
        public int DBBlockCount { get; set; }
        public int DBBlockSize { get; set; }
        public int IRegionSize { get; set; }
        public int QRegionSize { get; set; }
        public int TRegionCount { get; set; }
        public int CRegionCount { get; set; }
    }
}