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"
	"time"
)

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

	g.GET("/", handler("goals", func(c *gin.Context) (interface{}, error) {
		filter := models.GoalFilter{}
		if value := c.Query("minTime"); value != "" {
			minTime, err := time.Parse(time.RFC3339Nano, value)
			if err != nil {
				return nil, slerrors.BadRequest("Invalid minTime")
			}
			minTime = minTime.UTC()

			filter.MinTime = &minTime
		} else {
			lastMonth := time.Now().Add(-30 * 24 * time.Hour).UTC()
			filter.MinTime = &lastMonth
		}
		if value := c.Query("maxTime"); value != "" {
			maxTime, err := time.Parse(time.RFC3339Nano, value)
			if err != nil {
				return nil, slerrors.BadRequest("Invalid maxTime")
			}
			maxTime = maxTime.UTC()

			filter.MaxTime = &maxTime
		}
		if value := c.Query("includesTime"); value != "" {
			includesTime, err := time.Parse(time.RFC3339Nano, value)
			if err != nil {
				return nil, slerrors.BadRequest("Invalid includesTime")
			}
			includesTime = includesTime.UTC()

			filter.IncludesTime = &includesTime
		}

		return l.ListGoals(c.Request.Context(), filter)
	}))

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

	g.POST("/", handler("goal", func(c *gin.Context) (interface{}, error) {
		goal := models.Goal{}
		err := c.BindJSON(&goal)
		if err != nil {
			return nil, slerrors.BadRequest("Invalid JSON")
		}
		goal.ID = generate.GoalID()
		goal.UserID = auth.UserID(c)

		if goal.Amount <= 0 {
			return nil, slerrors.BadRequest("Goal amount must be more than 0.")
		}
		if goal.StartTime.IsZero() {
			return nil, slerrors.BadRequest("Start time must be set.")
		}
		if goal.EndTime.IsZero() {
			return nil, slerrors.BadRequest("End time must be set.")
		}
		if !goal.EndTime.After(goal.StartTime) {
			return nil, slerrors.BadRequest("Start time must be before end time.")
		}

		goal.StartTime = goal.StartTime.UTC()
		goal.EndTime = goal.EndTime.UTC()

		group, err := db.Groups().Find(c.Request.Context(), goal.GroupID)
		if err != nil {
			return nil, err
		}
		goal.GroupID = group.ID

		if goal.ItemID != nil {
			item, err := l.FindItem(c.Request.Context(), *goal.ItemID)
			if err != nil {
				return nil, slerrors.BadRequest("Item could not be found.")
			}
			if item.GroupID != goal.GroupID {
				return nil, slerrors.BadRequest("Item is not in group.")
			}
		}

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

		return l.FindGoal(c.Request.Context(), goal.ID)
	}))

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

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

		goal.StartTime = goal.StartTime.UTC()
		goal.EndTime = goal.EndTime.UTC()

		goal.Update(update)

		if goal.Amount <= 0 {
			return nil, slerrors.BadRequest("Goal amount must be more than 0.")
		}
		if !goal.EndTime.After(goal.StartTime) {
			return nil, slerrors.BadRequest("Start time must be before end time.")
		}

		if goal.ItemID != nil && update.ItemID != nil {
			item, err := l.FindItem(c.Request.Context(), *goal.ItemID)
			if err != nil {
				return nil, slerrors.BadRequest("Item could not be found.")
			}
			if item.GroupID != goal.GroupID {
				return nil, slerrors.BadRequest("Item is not in group.")
			}
		}

		err = db.Goals().Update(c.Request.Context(), goal.Goal)
		if err != nil {
			return nil, err
		}

		return goal, nil
	}))

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

		err = db.Goals().Delete(c.Request.Context(), goal.Goal)
		if err != nil {
			return nil, err
		}

		return goal, nil
	}))
}