// Package accountTicketHandlers
// Path: /internal/handlers/account/tickets/
// File: add.go
//
// Purpose
//   Renders & processes the Add Ticket form for authenticated users.
//
// Responsibilities
//   1) Validate user input (game type, draw date, balls and optional bonuses)
//   2) Convert string form values into typed model fields
//   3) Save through storage layer (InsertTicket)
//   4) Prevent DB access from unauthenticated contexts
//   5) Use PRG pattern (POST/Redirect/GET)
//
// Notes
//   - No direct SQL here — storage package enforces constraints
//   - CSRF provided via nosurf
//   - TODO: Replace inline session key with central sessionkeys.UserID

package accountTicketHandlers

import (
	"net/http"
	"strconv"
	"time"

	templateHandlers "synlotto-website/internal/handlers/template"
	templateHelpers "synlotto-website/internal/helpers/template"
	ticketStorage "synlotto-website/internal/storage/tickets"

	"synlotto-website/internal/models"
	"synlotto-website/internal/platform/bootstrap"

	"github.com/gin-gonic/gin"
	"github.com/justinas/nosurf"
)

// TODO: Replace with centralized key from sessionkeys package
const sessionKeyUserID = "UserID"

func AddGet(c *gin.Context) {
	app := c.MustGet("app").(*bootstrap.App)
	data := templateHandlers.BuildTemplateData(app, c.Writer, c.Request)
	ctx := templateHelpers.TemplateContext(c.Writer, c.Request, data)
	tmpl := templateHelpers.LoadTemplateFiles("layout.html", "web/templates/account/tickets/add_ticket.html")

	c.Header("Content-Type", "text/html; charset=utf-8")
	if err := tmpl.ExecuteTemplate(c.Writer, "account/tickets/add_ticket.html", ctx); err != nil {
		c.String(http.StatusInternalServerError, "render error: %v", err)
		return
	}
	c.Status(http.StatusOK)
}

func AddPost(c *gin.Context) {
	app := c.MustGet("app").(*bootstrap.App)

	var f addForm
	_ = c.ShouldBind(&f)
	f.Errors = map[string]string{}

	// Validate required fields
	if f.GameType == "" {
		f.Errors["game"] = "Game type is required."
	}
	if f.DrawDate == "" {
		f.Errors["draw_date"] = "Draw date is required."
	}

	balls, ballErrs := parseBalls(f.Ball1, f.Ball2, f.Ball3, f.Ball4, f.Ball5)
	for k, v := range ballErrs {
		f.Errors[k] = v
	}

	var drawDate time.Time
	if f.DrawDate != "" {
		if d, err := time.Parse("2006-01-02", f.DrawDate); err == nil {
			drawDate = d
		} else {
			f.Errors["draw_date"] = "Invalid date (use YYYY-MM-DD)."
		}
	}

	var bonus1Ptr, bonus2Ptr *int
	if f.Bonus1 != "" {
		if n, err := strconv.Atoi(f.Bonus1); err == nil {
			bonus1Ptr = &n
		} else {
			f.Errors["bonus1"] = "Bonus 1 must be a number."
		}
	}
	if f.Bonus2 != "" {
		if n, err := strconv.Atoi(f.Bonus2); err == nil {
			bonus2Ptr = &n
		} else {
			f.Errors["bonus2"] = "Bonus 2 must be a number."
		}
	}

	if len(f.Errors) > 0 {
		f.CSRFToken = nosurf.Token(c.Request)
		c.HTML(http.StatusUnprocessableEntity, "account/tickets/add_ticket.html", gin.H{
			"title": "Add Ticket",
			"form":  f,
		})
		return
	}

	// Build the ticket model expected by ticketStorage.InsertTicket
	ticket := models.Ticket{
		GameType: f.GameType,
		DrawDate: drawDate,
		Ball1:    balls[0],
		Ball2:    balls[1],
		Ball3:    balls[2],
		Ball4:    balls[3],
		Ball5:    balls[4],
		Bonus1:   bonus1Ptr,
		Bonus2:   bonus2Ptr,
		// TODO: populate UserID from session when per-user tickets enabled
	}

	if err := ticketStorage.InsertTicket(app.DB, ticket); err != nil {
		// optional: set flash and re-render
		f.Errors["form"] = "Could not save ticket. Please try again."
		f.CSRFToken = nosurf.Token(c.Request)
		c.HTML(http.StatusInternalServerError, "account/tickets/add_ticket.html", gin.H{
			"title": "Add Ticket",
			"form":  f,
		})
		return
	}

	c.Redirect(http.StatusSeeOther, "/account/tickets")
}

// helpers
func parseBalls(b1, b2, b3, b4, b5 string) ([5]int, map[string]string) {
	errs := map[string]string{}
	toInt := func(name, v string) (int, bool) {
		n, err := strconv.Atoi(v)
		if err != nil {
			errs[name] = "Must be a number."
			return 0, false
		}
		return n, true
	}
	var out [5]int
	ok := true
	if out[0], ok = toInt("ball1", b1); !ok {
	}
	if out[1], ok = toInt("ball2", b2); !ok {
	}
	if out[2], ok = toInt("ball3", b3); !ok {
	}
	if out[3], ok = toInt("ball4", b4); !ok {
	}
	if out[4], ok = toInt("ball5", b5); !ok {
	}
	return out, errs
}