package api

import (
	"github.com/gin-gonic/gin"
	"github.com/gissleh/stufflog/database"
	"github.com/gissleh/stufflog/internal/auth"
	"github.com/gissleh/stufflog/internal/generate"
	"github.com/gissleh/stufflog/internal/slerrors"
	"github.com/gissleh/stufflog/models"
	"github.com/gissleh/stufflog/services"
)

func Item(g *gin.RouterGroup, db database.Database) {
	l := services.Loader{DB: db}

	g.GET("/", handler("items", func(c *gin.Context) (interface{}, error) {
		return l.ListItems(c, models.ItemFilter{})
	}))

	g.GET("/:id", handler("item", func(c *gin.Context) (interface{}, error) {
		return l.FindItem(c, c.Param("id"))
	}))

	g.POST("/", handler("item", func(c *gin.Context) (interface{}, error) {
		item := models.Item{}
		err := c.BindJSON(&item)
		if err != nil {
			return nil, slerrors.BadRequest("Invalid JSON")
		}

		group, err := db.Groups().Find(c.Request.Context(), item.GroupID)
		if err != nil {
			return nil, err
		} else if auth.UserID(c) != group.UserID {
			return nil, slerrors.NotFound("Group")
		}

		item.ID = generate.ItemID()
		item.UserID = auth.UserID(c)
		item.GroupID = group.ID

		err = db.Items().Insert(c.Request.Context(), item)
		if err != nil {
			return nil, err
		}

		return &models.ItemResult{
			Item:  item,
			Group: group,
		}, nil
	}))

	g.PUT("/:id", handler("item", func(c *gin.Context) (interface{}, error) {
		update := models.ItemUpdate{}
		err := c.BindJSON(&update)
		if err != nil {
			return nil, slerrors.BadRequest("Invalid JSON")
		}

		item, err := l.FindItem(c.Request.Context(), c.Param("id"))
		if err != nil {
			return nil, err
		}

		item.Update(update)
		err = db.Items().Update(c.Request.Context(), item.Item)
		if err != nil {
			return nil, err
		}

		return item, nil
	}))

	g.DELETE("/:id", handler("item", func(c *gin.Context) (interface{}, error) {
		item, err := l.FindItem(c.Request.Context(), c.Param("id"))
		if err != nil {
			return nil, err
		}

		tasks, err := db.Tasks().List(c.Request.Context(), models.TaskFilter{
			UserID:  auth.UserID(c),
			ItemIDs: []string{item.ID},
		})
		if err != nil {
			return nil, err
		}
		if len(tasks) > 0 {
			return nil, slerrors.Forbidden("cannot delete item referenced in tasks.")
		}

		err = db.Items().Delete(c.Request.Context(), item.Item)
		if err != nil {
			return nil, err
		}

		return item, nil
	}))
}