package api

import (
	"git.aiterp.net/stufflog3/stufflog3-api/internal/auth"
	"git.aiterp.net/stufflog3/stufflog3-api/internal/database"
	"git.aiterp.net/stufflog3/stufflog3-api/internal/models"
	"git.aiterp.net/stufflog3/stufflog3-api/internal/slerrors"
	"github.com/gin-gonic/gin"
	"time"
)

func Items(g *gin.RouterGroup, db database.Database) {
	g.Use(scopeIDMiddleware(db))

	g.GET("/", handler("items", func(c *gin.Context) (res interface{}, err error) {
		mode := c.Query("mode")

		var fromTime, toTime time.Time
		var fromDate, toDate models.Date
		if mode != "scheduled" {
			if c.Query("to") == "" {
				toTime = time.Now()
			} else {
				toTime, err = time.Parse(time.RFC3339Nano, c.Query("to"))
				if err != nil {
					return nil, slerrors.BadRequest("Invalid value for to")
				}
			}
			if c.Query("from") == "" {
				fromTime = time.Now().Add(-time.Hour * 24 * 30)
			} else {
				fromTime, err = time.Parse(time.RFC3339Nano, c.Query("from"))
				if err != nil {
					return nil, slerrors.BadRequest("Invalid value for from")
				}
			}
			if toTime.After(toTime) {
				return nil, slerrors.BadRequest("the flow of time itself is convoluted, but not so for the database")
			}
		} else {
			if c.Query("to") == "" {
				toDate, _ = models.ParseDate(time.Now().Add(time.Hour * 24 * 7).Format("2006-01-02"))
			} else {
				toDate, err = models.ParseDate(c.Query("to"))
				if err != nil {
					return nil, slerrors.BadRequest("Invalid value for to")
				}
			}
			if c.Query("from") == "" {
				fromDate, _ = models.ParseDate(time.Now().Format("2006-01-02"))
			} else {
				fromDate, err = models.ParseDate(c.Query("from"))
				if err != nil {
					return nil, slerrors.BadRequest("Invalid value for from")
				}
			}
		}

		switch mode {
		case "", "created":
			return db.Items(getScope(c).ID).ListCreated(c.Request.Context(), fromTime, toTime)
		case "acquired":
			return db.Items(getScope(c).ID).ListAcquired(c.Request.Context(), fromTime, toTime)
		case "loose":
			return db.Items(getScope(c).ID).ListLoose(c.Request.Context(), fromTime, toTime)
		case "scheduled":
			return db.Items(getScope(c).ID).ListScheduled(c.Request.Context(), fromDate, toDate)
		default:
			return nil, slerrors.BadRequest("unknown mode")
		}
	}))

	g.GET("/:id", handler("item", func(c *gin.Context) (interface{}, error) {
		id, err := reqInt(c, "id")
		if err != nil {
			return nil, err
		}

		return db.Items(getScope(c).ID).Find(c.Request.Context(), 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 input: " + err.Error())
		}

		item.CreatedTime = time.Now()

		if item.Name == "" {
			return nil, slerrors.BadRequest("Blank item name not allowed")
		}
		if item.OwnerID == "" {
			item.OwnerID = auth.UserID(c)
		} else if getScope(c).HasMember(item.OwnerID) {
			return nil, slerrors.Forbidden("Owner is not part of scope.")
		}
		for _, stat := range item.Stats {
			if getScope(c).Stat(stat.ID) == nil {
				return nil, slerrors.Forbidden("One or more stats are not part of scope.")
			}
			if stat.Acquired == 0 && stat.Required == 0 {
				return nil, slerrors.BadRequest("0/0 stats are not allowed when creating items.")
			}
		}

		return db.Items(getScope(c).ID).Create(c.Request.Context(), *item)
	}))

	g.PUT("/:id", handler("item", func(c *gin.Context) (interface{}, error) {
		id, err := reqInt(c, "id")
		if err != nil {
			return nil, err
		}

		update := &models.ItemUpdate{}
		err = c.BindJSON(update)
		if err != nil {
			return nil, slerrors.BadRequest("Invalid JSON input: " + err.Error())
		}

		item, err := db.Items(getScope(c).ID).Find(c.Request.Context(), id)
		if err != nil {
			return nil, err
		}

		if update.Name != nil && *update.Name == "" {
			return nil, slerrors.BadRequest("Blank item name not allowed")
		}
		if update.OwnerID != nil || !getScope(c).HasMember(item.OwnerID) {
			return nil, slerrors.Forbidden("New item is not part of scope.")
		}
		for _, stat := range update.Stats {
			statRef := getScope(c).Stat(stat.ID)
			if stat.Required != 0 && stat.Acquired != 0 && statRef == nil {
				return nil, slerrors.Forbidden("One or more stats are not part of the scope.")
			}
			if !statRef.AllowsAmount(stat.Required) {
				return nil, slerrors.Forbidden("One or more stats have a disallowed required amount.")
			}
		}

		return db.Items(getScope(c).ID).Update(c.Request.Context(), *item, *update)
	}))

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

		item, err := db.Items(getScope(c).ID).Find(c.Request.Context(), id)
		if err != nil {
			return nil, err
		}

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

		return item, nil
	}))
}