using Microsoft.AspNetCore.Mvc;

namespace HyperBooru;

[ApiController]
[Route("/api/tag")]
public class TagController : Controller {
    private HyperBooruDbContext db;

    public TagController(HyperBooruDbContext db) =>
        this.db = db;

    [HttpPost("{objectId}/{tagId}")]
    public IActionResult AddTag([FromRoute] Guid objectId, [FromRoute] Guid tagId) {
        var obj = db.Objects.First(o => o.Guid == objectId);
        var def = db.TagDefinitions.First(d => d.Guid == tagId);

        if(obj is null || def is null)
            return NotFound();

        bool alreadyTagged = obj.Tags
            .Select(t => t.TagDefinition.Guid)
            .Contains(def.Guid);

        if(alreadyTagged)
            return BadRequest();

        obj.Tags.Add(new() {
            TagDefinition = def,
            Target        = obj
        });

        db.SaveChanges();

        return Ok();
    }

    [HttpDelete("{objectId}/{tagId}")]
    public IActionResult RemoveTag([FromRoute] Guid objectId, [FromRoute] Guid tagId) {
        var obj = db.Objects.First(o => o.Guid == objectId);

        if(obj is null)
            return NotFound();

        var tag = obj.Tags
            .First(t => t.Guid == tagId || t.TagDefinition.Guid == tagId);

        if(tag is null)
            return NotFound();

        obj.Tags.Remove(tag);
        db.SaveChanges();

        return Ok();
    }

    [HttpPost("def")]
    public void CreateTagDefinition(
        [FromForm] string name,
        [FromForm] string? @namespace) {

        DbTagDefinition tagdef = new() {
            Source    = TagSource.UserTag,
            Namespace = @namespace,
            Name      = name
        };
        if(!db.TagDefinitions.Contains(tagdef))
            db.TagDefinitions.Add(tagdef);
        db.SaveChanges();
    }

    [HttpDelete("def/{tagId}")]
    public IActionResult DeleteTagDefinition([FromRoute] Guid tagId) {
        var tagdef = db.TagDefinitions.First(td => td.Guid == tagId);
        if(tagdef is null)
            return NotFound();

        using var transaction = db.Database.BeginTransaction();

        db.Tags.RemoveRange(
            db.Tags.Where(t => t.TagDefinition == tagdef));
        db.TagDefinitions.Remove(tagdef);
        db.SaveChanges();

        transaction.Commit();

        return Ok();
    }
}