using MealPlan.Api.DTOs.Generators;
using MealPlan.Api.Extensions;
using MealPlan.Api.Services.Generators;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace MealPlan.Api.Controllers;

[ApiController]
[Route("api/diet-generator")]
[Authorize]
public class DietGeneratorController : ControllerBase
{
    private readonly IDietGeneratorService _service;

    public DietGeneratorController(IDietGeneratorService service) => _service = service;

    [HttpGet("profile")]
    [ProducesResponseType(typeof(DietUserProfileDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> GetProfile(CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        var profile = await _service.GetProfileAsync(userId, ct);
        return Ok(profile ?? new DietUserProfileDto());
    }

    [HttpPut("profile")]
    [ProducesResponseType(typeof(DietUserProfileDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> UpsertProfile([FromBody] DietUserProfileDto dto, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        return Ok(await _service.UpsertProfileAsync(userId, dto, ct));
    }

    [HttpPost("sessions")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status201Created)]
    public async Task<IActionResult> CreateSession([FromBody] CreateDietGeneratorSessionDto dto, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        try
        {
            var session = await _service.CreateSessionAsync(userId, dto, ct);
            return CreatedAtAction(nameof(GetSession), new { id = session.Id }, session);
        }
        catch (InvalidOperationException ex)
        {
            return BadRequest(new { error = ex.Message });
        }
    }

    [HttpGet("sessions/{id:int}")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public async Task<IActionResult> GetSession(int id, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        var session = await _service.GetSessionAsync(userId, id, ct);
        return session is null ? NotFound() : Ok(session);
    }

    [HttpPost("sessions/{id:int}/propose-macros")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> ProposeMacros(int id, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        var session = await _service.ProposeMacrosAsync(userId, id, ct);
        return session is null ? NotFound() : Ok(session);
    }

    [HttpPost("sessions/{id:int}/accept-macros")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> AcceptMacros(int id, [FromBody] AcceptMacrosDto dto, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        var session = await _service.AcceptMacrosAsync(userId, id, dto, ct);
        return session is null ? NotFound() : Ok(session);
    }

    [HttpPost("sessions/{id:int}/generate-plan")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> GeneratePlan(int id, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        try
        {
            var session = await _service.GeneratePlanAsync(userId, id, ct);
            return session is null ? NotFound() : Ok(session);
        }
        catch (InvalidOperationException ex)
        {
            return BadRequest(new { error = ex.Message });
        }
    }

    [HttpPost("sessions/{id:int}/regenerate-meal")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> RegenerateMeal(int id, [FromBody] RegenerateDietMealDto dto, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        try
        {
            var session = await _service.RegenerateMealAsync(userId, id, dto, ct);
            return session is null ? NotFound() : Ok(session);
        }
        catch (InvalidOperationException ex)
        {
            return BadRequest(new { error = ex.Message });
        }
    }

    [HttpPatch("sessions/{id:int}/meals/{mealId:int}")]
    [ProducesResponseType(typeof(DietGeneratorSessionDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> UpdateMeal(int id, int mealId, [FromBody] UpdateDraftMealDto dto, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        var session = await _service.UpdateDraftMealAsync(userId, id, mealId, dto, ct);
        return session is null ? NotFound() : Ok(session);
    }

    [HttpPost("sessions/{id:int}/commit")]
    [ProducesResponseType(typeof(CommitDietPlanResultDto), StatusCodes.Status200OK)]
    public async Task<IActionResult> Commit(int id, CancellationToken ct)
    {
        if (User.RequireUserId(out var userId) is { } unauthorized) return unauthorized;
        var result = await _service.CommitAsync(userId, id, ct);
        return result is null ? NotFound() : Ok(result);
    }
}