package apis

import (
	"errors"
	"fmt"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	. "planner/core"
)

func createPlan(c *gin.Context) {
	u := extractUser(db, c)
	if u == nil {
		return
	}

	var plan_req struct {
		Name string `json:"name" form:"name"`
	}
	c.Bind(&plan_req)

	_, err := CreatePlan(db, u, plan_req.Name)

	if err != nil {
		c.JSON(http.StatusInternalServerError, err)
	} else {
		c.JSON(http.StatusOK, plan_req)
	}
}

func listPlans(c *gin.Context) {
	u := extractUser(db, c)
	if u == nil {
		return
	}
	plans, err := u.ListPlans(db)
	if err == nil {
		c.JSON(http.StatusOK, plans)
	} else {
		c.String(http.StatusInternalServerError, err.Error())
	}
}

func getPlan(c *gin.Context) {
	user := extractUser(db, c)
	if user == nil {
		return
	}

	var params struct {
		Id uint `uri:"id"`
	}
	bind_result := c.BindUri(&params)
	if bind_result != nil {
		return
	}

	plan, err := user.GetPlan(db, params.Id)

	if err == nil {
		c.JSON(http.StatusOK, plan)
	} else if errors.Is(err, ErrNotMember) {
		c.Status(http.StatusForbidden)
	} else if errors.Is(err, ErrNotFound) {
		c.Status(http.StatusNotFound)
	} else {
		c.String(http.StatusInternalServerError, err.Error())
	}
}

func listPlanMembers(c *gin.Context) {
	user := extractUser(db, c)
	if user == nil {
		return
	}

	plan_id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.Status(http.StatusBadRequest)
		return
	}

	plan, err := user.GetPlan(db, uint(plan_id))
	members, err := plan.GetAllUsers(db)

	if err == nil {
		c.JSON(http.StatusOK, members)
	} else if errors.Is(err, ErrNotMember) {
		c.Status(http.StatusForbidden)
	} else if errors.Is(err, ErrNotFound) {
		c.Status(http.StatusNotFound)
	} else {
		c.String(http.StatusInternalServerError, err.Error())
	}
}

func addPlanMember(c *gin.Context) {
	user := extractUser(db, c)
	if user == nil {
		return
	}

	plan_id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.Status(http.StatusBadRequest)
		return
	}

	plan, err := user.GetPlan(db, uint(plan_id))

	var new_member struct {
		Name string `json:"name" form:"name"`
	}
	if err := c.ShouldBind(&new_member); err != nil {
		c.String(http.StatusInternalServerError, err.Error())
		return
	}

	err = plan.AddMember(db, &Member{Name: new_member.Name})

	if err == nil {
		c.JSON(http.StatusOK, new_member)
	} else if errors.Is(err, ErrNotMember) {
		c.Status(http.StatusForbidden)
	} else if errors.Is(err, ErrNotFound) {
		c.Status(http.StatusNotFound)
	} else {
		c.String(http.StatusInternalServerError, err.Error())
	}
}

func joinPlan(c *gin.Context) {
	user := extractUser(db, c)
	if user == nil {
		c.Status(http.StatusUnauthorized)
		return
	}

	plan_id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.Status(http.StatusBadRequest)
		return
	}
	plan, err := GetPlan(db, uint(plan_id))
	if err != nil || plan == nil {
		c.Status(http.StatusInternalServerError)
		return
	}

	var query struct {
		JoinCode string `form:"code"`
	}
	if c.ShouldBindQuery(&query) != nil || query.JoinCode == "" {
		c.Status(http.StatusBadRequest)
		return
	}
	if query.JoinCode != plan.JoinCode {
		c.String(http.StatusConflict, "Invalid join code")
		return
	}

	is_member, err := plan.IsMember(db, user)
	if err != nil {
		c.Status(http.StatusInternalServerError)
		return
	}
	if is_member {
		c.String(http.StatusConflict, "User already a member")
		return
	}
	plan.AddMember(db, &Member{UserID: user.Username})
	c.Status(http.StatusOK)
}

func createPlanPoll(c *gin.Context) {
	user := extractUser(db, c)
	if user == nil {
		return
	}

	var params struct {
		Id uint `uri:"id"`
	}
	bind_result := c.BindUri(&params)
	if bind_result != nil {
		return
	}

	plan, err := user.GetPlan(db, params.Id)

	if errors.Is(err, ErrNotFound) {
		c.Status(http.StatusNotFound)
		return
	} else if errors.Is(err, ErrNotMember) {
		c.Status(http.StatusForbidden)
		return
	} else if err != nil {
		c.String(http.StatusInternalServerError, err.Error())
		return
	}

	var poll_opts struct {
		Options string `json:"options"`
	}
	bind_result = c.Bind(&poll_opts)
	if bind_result != nil {
		fmt.Println(bind_result)
		return
	}

	poll := Poll{
		PlanID:  plan.ID,
		Options: poll_opts.Options,
	}
	db.Create(&poll)

	c.JSON(http.StatusCreated, poll)
}

func listPlanPolls(c *gin.Context) {
	user := extractUser(db, c)
	if user == nil {
		return
	}

	var params struct {
		Id uint `uri:"id"`
	}

	bind_result := c.BindUri(&params)
	if bind_result != nil {
		c.Status(http.StatusBadRequest)
		return
	}

	var polls []Poll
	db.Where("plan_id = ?", params.Id).Find(&polls)
	c.JSON(http.StatusOK, polls)
}

func bindPlanAPIs(r *gin.Engine) {
	r.POST("/plans", createPlan)
	r.GET("/plans", listPlans)
	r.GET("/plans/:id", getPlan)
	r.GET("/plans/:id/members", listPlanMembers)
	r.POST("/plans/:id/members", addPlanMember)
	r.GET("/plans/:id/join", joinPlan)
	r.POST("/plans/:id/polls", createPlanPoll)
	r.GET("/plans/:id/polls", listPlanPolls)
}