using Flawless.Communication.Request;
using Flawless.Communication.Response;
using Flawless.Server.Models;
using Flawless.Server.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace Flawless.Server.Controllers;

[ApiController, Authorize, Route("api/admin")]
public class AdminController(
    UserManager<AppUser> userManager,
    AccessControlService accessControlService,
    ILogger<AdminController> logger,
    AppDbContext dbContext) : ControllerBase
{

    private async ValueTask<ActionResult?> TestIfValid()
    {
        var user = (await userManager.GetUserAsync(HttpContext.User))!;
        if (user.Admin == false) return BadRequest(new FailedResponse("Only admin can do this!"));
        return null;
    }
    
    [HttpPost("add_user")]
    public async Task<IActionResult> AddUserAsync(RegisterRequest request)
    {
        var user = new AppUser
        {
            UserName = request.Username, 
            Email = request.Email,
            EmailConfirmed = true,
            CreatedOn = DateTime.UtcNow
        };
        
        user.RenewSecurityStamp();
        var result = await userManager.CreateAsync(user, request.Password);
        if (result.Succeeded) 
        {
            await userManager.SetLockoutEnabledAsync(user, false);
            logger.LogInformation("User '{0}' created (SUPERUSER REGISTER)", user.UserName);
            return Ok();
        }
        
        logger.LogInformation("User '{0}' NOT created (SUPERUSER REGISTER) : {1}", user.UserName, result.Errors);
        return BadRequest(new FailedResponse(result.Errors));
    }
    
    [HttpPost("superuser/{username}")]
    public async Task<IActionResult> SetSuperuserAsync(string username, bool toSuper)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        var user = await userManager.FindByNameAsync(username);
        var optUser = (await userManager.GetUserAsync(HttpContext.User))!;
        
        if (user == null) return BadRequest(new FailedResponse("User does not exist!"));
        if (optUser == user) return BadRequest(new FailedResponse("You cannot set/unset yourself to superuser!"));
        
        user.Admin = toSuper;
        await userManager.UpdateAsync(user);
        return Ok();
    }
    
    
    [HttpGet("superuser/{username}")]
    public async Task<ActionResult<bool>> GetSuperuserAsync(string username)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        var user = await userManager.FindByNameAsync(username);
        if (user == null) return BadRequest(new FailedResponse("User does not exist!"));

        return user.Admin;
    }

    [HttpGet("user/list")]
    public async Task<ActionResult<IEnumerable<UserInfoResponse>>> GetUsersAsync()
    {
        var t = await TestIfValid();
        if (t != null) return t;

        var r = await userManager.Users.Select(x => new UserInfoResponse
        {
            Authorized = true,
            Username = x.UserName,
            CreatedAt = x.CreatedOn,
            Bio = x.Bio,
            Gender = x.Gender,
            NickName = x.NickName,
            PublicEmail = x.PublicEmail,
            Email = x.Email,
            Phone = x.PhoneNumber,
            IsAdmin = x.Admin,
            IsActive = !x.LockoutEnabled
        }).ToArrayAsync();

        return r;
    }
    
    [HttpPost("user/delete/{username}")]
    public async Task<IActionResult> DeleteUserAsync(string username)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        var user = await userManager.FindByNameAsync(username);
        
        if (user == null) return BadRequest(new FailedResponse("User does not exist!"));
        var result = await userManager.DeleteAsync(user);

        if (!result.Succeeded) return BadRequest(new FailedResponse(result.Errors));
        return Ok();
    }
    
    [HttpPost("user/enable/{username}")]
    public async Task<IActionResult> EnableUserAsync(string username)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        var user = await userManager.FindByNameAsync(username);
        
        if (user == null) return BadRequest(new FailedResponse("User does not exist!"));
        var result = await userManager.SetLockoutEnabledAsync(user, false);

        if (!result.Succeeded) return BadRequest(new FailedResponse(result.Errors));
        return Ok();
    }
    
    [HttpPost("user/disable/{username}")]
    public async Task<IActionResult> DisableUserAsync(string username)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        var user = await userManager.FindByNameAsync(username);
        
        if (user == null) return BadRequest(new FailedResponse("User does not exist!"));
        var result = await userManager.SetLockoutEnabledAsync(user, true);

        if (!result.Succeeded) return BadRequest(new FailedResponse(result.Errors));
        return Ok();
    }

    [HttpPost("user/reset_password")]
    public async Task<IActionResult> ResetPasswordAsync(ResetPasswordRequest r)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        if (r.Identity == null) return BadRequest(new FailedResponse("Identity (User Id) is not set!"));
        var user = await userManager.FindByNameAsync(r.Identity);
        
        if (user == null) return BadRequest(new FailedResponse("Identity (User Id) does not exist!"));
        var result = await userManager.ResetPasswordAsync(user, "", r.NewPassword);
        
        if (!result.Succeeded) return BadRequest(new FailedResponse(result.Errors));
        return Ok();
    }

    [HttpPost("access_control/ip_whitelist")]
    public async Task<IActionResult> SetIpWhitelistAsync([FromBody] string[] ips)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        await accessControlService.UpdatePolicyAsync(IpPolicyType.Whitelist, ips);
        return Ok();
    }
    
    [HttpGet("access_control/ip_whitelist")]
    public async Task<ActionResult<IEnumerable<string>>> GetIpWhitelistAsync()
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        return Ok(await accessControlService.GetIpListAsync(IpPolicyType.Whitelist));
    }
    
    [HttpPost("access_control/ip_blacklist")]
    public async Task<IActionResult> SetIpBlacklistAsync([FromBody] string[] ips)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        await accessControlService.UpdatePolicyAsync(IpPolicyType.Blacklist, ips);
        return Ok();
    }
    
    [HttpGet("access_control/ip_blacklist")]
    public async Task<ActionResult<IEnumerable<string>>> GetIpBlacklistAsync()
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        return Ok(await accessControlService.GetIpListAsync(IpPolicyType.Blacklist));
    }

    [HttpGet("logs")]
    public async Task<ActionResult<IEnumerable<LogEntryResponse>>> GetSystemLogsAsync(
        [FromQuery] DateTime startTime,
        [FromQuery] DateTime endTime,
        [FromQuery] int level,
        [FromQuery] int page,
        [FromQuery] int pageSize)
    {
        var t = await TestIfValid();
        if (t != null) return t;
        
        var query = dbContext.SystemLogs.Where(x =>
            x.Timestamp >= startTime && x.Timestamp <= endTime && (int) x.LogLevel >= level
        ).AsQueryable();

        // 分页处理
        // var totalCount = await query.CountAsync();
        var results = await query
            .OrderByDescending(l => l.Timestamp)
            .Skip((page - 1) * pageSize)
            .Take(pageSize)
            .Select(l => new LogEntryResponse(
                l.Timestamp,
                l.LogLevel.ToString(),
                l.Message,
                l.Exception))
            .ToListAsync();

        return Ok(results);
    }
}