using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using MealPlanner.Services;

namespace MealPlanner.Controllers;

[ApiController]
[Route("api/mealplan")]
[Authorize]
public class MealPlanController(MealPlanService mealPlanService) : ControllerBase
{
    private string UserId => User.FindFirst("sub")?.Value ?? throw new UnauthorizedAccessException();

    public record GenerateRequest(string? WeekStart);
    public record SwapRequest(Guid RecipeId);

    [HttpPost("generate")]
    public async Task<IActionResult> Generate([FromBody] GenerateRequest? body)
    {
        DateOnly weekStart;

        if (body?.WeekStart is not null && DateOnly.TryParse(body.WeekStart, out var parsed))
        {
            weekStart = MealPlanService.GetWeekStart(parsed);
        }
        else
        {
            weekStart = MealPlanService.GetWeekStart(DateOnly.FromDateTime(DateTime.UtcNow));
        }

        var plan = await mealPlanService.GenerateWeekPlanAsync(UserId, weekStart);
        return Ok(plan);
    }

    [HttpGet("current")]
    public async Task<IActionResult> GetCurrent()
    {
        var plan = await mealPlanService.GetCurrentPlanAsync(UserId);
        if (plan is null) return NotFound();
        return Ok(plan);
    }

    [HttpGet("{weekStart}")]
    public async Task<IActionResult> GetByWeek(string weekStart)
    {
        if (!DateOnly.TryParse(weekStart, out var date)) return BadRequest("Invalid date format.");
        var plan = await mealPlanService.GetPlanAsync(UserId, date);
        if (plan is null) return NotFound();
        return Ok(plan);
    }

    [HttpPut("{id:guid}/entry/{date}")]
    public async Task<IActionResult> SwapEntry(Guid id, string date, [FromBody] SwapRequest body)
    {
        if (!DateOnly.TryParse(date, out var parsedDate)) return BadRequest("Invalid date format.");

        // Find entry by plan id + date
        var plan = await mealPlanService.GetPlanAsync(UserId, MealPlanService.GetWeekStart(parsedDate));
        if (plan is null || plan.Id != id) return NotFound();

        var entry = plan.Entries.FirstOrDefault(e => e.Date == parsedDate);
        if (entry is null) return NotFound();

        try
        {
            var updated = await mealPlanService.SwapEntryAsync(entry.Id, body.RecipeId, UserId);
            if (updated is null) return NotFound();
            return Ok(updated);
        }
        catch (UnauthorizedAccessException)
        {
            return Forbid();
        }
    }

    [HttpPost("{id:guid}/entry/{date}/reroll")]
    public async Task<IActionResult> RerollEntry(Guid id, string date)
    {
        if (!DateOnly.TryParse(date, out var parsedDate)) return BadRequest("Invalid date format.");

        var plan = await mealPlanService.GetPlanAsync(UserId, MealPlanService.GetWeekStart(parsedDate));
        if (plan is null || plan.Id != id) return NotFound();

        var entry = plan.Entries.FirstOrDefault(e => e.Date == parsedDate);
        if (entry is null) return NotFound();

        try
        {
            var updated = await mealPlanService.RerollEntryAsync(entry.Id, UserId);
            if (updated is null) return StatusCode(503, "Could not fetch a new recipe. Try again.");
            return Ok(updated);
        }
        catch (UnauthorizedAccessException)
        {
            return Forbid();
        }
    }
}