using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using PlotLine.Services;
using PlotLine.ViewModels;

namespace PlotLine.Controllers;

[Authorize]
public sealed class LocationsController(ILocationService locations) : Controller
{
    public async Task<IActionResult> Index(int projectId)
    {
        var model = await locations.GetLocationsAsync(projectId);
        return model is null ? NotFound() : View(model);
    }

    public async Task<IActionResult> Create(int projectId)
    {
        var model = await locations.GetCreateAsync(projectId);
        return model is null ? NotFound() : View("Edit", model);
    }

    public async Task<IActionResult> Edit(int id)
    {
        var model = await locations.GetEditAsync(id);
        return model is null ? NotFound() : View(model);
    }

    public async Task<IActionResult> Details(int id)
    {
        var model = await locations.GetDetailAsync(id);
        return model is null ? NotFound() : View(model);
    }

    public async Task<IActionResult> Merge(int id)
    {
        var model = await locations.GetMergeAsync(id);
        return model is null ? NotFound() : View(model);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Merge([Bind(Prefix = "Form")] EntityMergeForm form)
    {
        if (ModelState.IsValid)
        {
            try
            {
                var result = await locations.MergeAsync(form);
                if (result is null) return NotFound();
                TempData["LocationMessage"] = $"{result.SourceName} merged into {result.TargetName}.";
                return RedirectToAction(nameof(Details), new { id = result.TargetID });
            }
            catch (InvalidOperationException ex)
            {
                ModelState.AddModelError(string.Empty, ex.Message);
            }
        }
        var model = await locations.GetMergeAsync(form.SourceID);
        if (model is null) return NotFound();
        model.Form = form;
        return View(model);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Reparent(int projectId, int locationId, int parentLocationId, int? expectedParentLocationId)
    {
        if (!ModelState.IsValid)
        {
            if (IsAjaxRequest()) return BadRequest(new { error = "Invalid location selection. Please try again." });
            TempData["LocationError"] = "Invalid location selection. Please try again.";
            return RedirectToAction(nameof(Index), new { projectId });
        }
        try
        {
            await locations.ReparentAsync(projectId, locationId, parentLocationId, expectedParentLocationId);
            if (IsAjaxRequest())
            {
                var model = await locations.GetLocationsAsync(projectId);
                return model is null ? NotFound() : PartialView("_LocationTree", model);
            }
            TempData["LocationMessage"] = "Location moved to its new parent.";
        }
        catch (InvalidOperationException ex)
        {
            if (IsAjaxRequest()) return BadRequest(new { error = ex.Message });
            TempData["LocationError"] = ex.Message;
        }
        return RedirectToAction(nameof(Index), new { projectId });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Save(LocationEditViewModel model)
    {
        if (!ModelState.IsValid)
        {
            var editModel = model.LocationID == 0
                ? await locations.GetCreateAsync(model.ProjectID)
                : await locations.GetEditAsync(model.LocationID);
            if (editModel is null)
            {
                return NotFound();
            }

            editModel.ParentLocationID = model.ParentLocationID;
            editModel.LocationName = model.LocationName;
            editModel.Aliases = model.Aliases;
            editModel.LocationTypeID = model.LocationTypeID;
            editModel.Description = model.Description;
            editModel.ShowInQuickAddBar = model.ShowInQuickAddBar;
            editModel.ExcludeFromCompanionDetection = model.ExcludeFromCompanionDetection;
            editModel.DetectionPriority = model.DetectionPriority;
            return View("Edit", editModel);
        }

        var locationId = await locations.SaveAsync(model);
        return RedirectToAction(nameof(Details), new { id = locationId });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> SetPreferredName(int id, string preferredName)
    {
        try
        {
            await locations.SetPreferredNameAsync(id, preferredName);
            TempData["LocationMessage"] = $"Preferred name set to {preferredName}.";
        }
        catch (InvalidOperationException ex)
        {
            TempData["LocationMessage"] = ex.Message;
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Archive(int id, int projectId)
    {
        await locations.ArchiveAsync(id);
        TempData["ArchiveMessage"] = "Location archived. You can restore it from Archived Items.";
        return RedirectToAction(nameof(Index), new { projectId });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> AddRelationship(LocationRelationshipEditViewModel model)
    {
        await locations.SaveRelationshipAsync(model);
        return RedirectToAction(nameof(Details), new { id = model.FromLocationID });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> DropRelationship(LocationRelationshipEditViewModel model)
    {
        if (!ModelState.IsValid || model.FromLocationID == model.ToLocationID)
        {
            if (IsAjaxRequest()) return BadRequest(new { error = "Choose two different locations and a relationship type." });
            return RedirectToAction(nameof(Index), new { projectId = model.ProjectID });
        }
        try
        {
            await locations.SaveRelationshipAsync(model);
            if (IsAjaxRequest()) return Json(new { message = "Location relationship saved." });
        }
        catch (InvalidOperationException ex)
        {
            if (IsAjaxRequest()) return BadRequest(new { error = ex.Message });
            TempData["LocationError"] = ex.Message;
        }
        return RedirectToAction(nameof(Index), new { projectId = model.ProjectID });
    }

    private bool IsAjaxRequest() => Request.Headers["X-Requested-With"] == "XMLHttpRequest";

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> ArchiveRelationship(int id, int returnLocationId)
    {
        await locations.ArchiveRelationshipAsync(id);
        TempData["ArchiveMessage"] = "Location relationship archived.";
        return RedirectToAction(nameof(Details), new { id = returnLocationId });
    }
}