module main

import vweb
import db.sqlite
import time
import net.http
import arrays
import maps
import math.stats

const http_port = 8080

enum Status {
	besteld   = 0
	bakken    = 1
	klaar     = 2
	afgegeven = 3
}

pub fn (s Status) str() string {
	return match s {
		.besteld { 'Pannenkoek besteld' }
		.bakken { 'Pannenkoek aan het bakken' }
		.klaar { 'Pannenkoek klaar' }
		.afgegeven { 'Pannenkoek afgegeven' }
	}
}

struct Person {
	id            int       @[primary; sql: serial]
	status        int
	name          string
	remark        string
	order_time    time.Time
	delivery_time time.Time
}

pub fn (p Person) str() string {
	return 'Person[id:${p.id}, name: ${p.name}, status:${p.status}, time:${p.order_time}, end:${p.delivery_time}]'
}

pub fn (p Person) order_time_humanized() string {
	return p.order_time.relative()
}

pub fn (p Person) remark() string {
	return if p.remark.len > 0 {
		'(${p.remark})'
	} else {
		''
	}
}

pub fn (p Person) status_str() string {
	unsafe {
		s := Status(p.status)
		return s.str()
	}
}

// === Database ===

pub fn create_db_connection() !sqlite.DB {
	return sqlite.connect('pancakes.db')!
}

fn (mut app App) get_people() ![]Person {
	status_filter := int(Status.afgegeven)
	people := sql app.db {
		select from Person where status < status_filter
	}!
	return people
}

fn (mut app App) get_finished_count() !int {
	people := sql app.db {
		select from Person where status == 3
	}!
	return people.len
}

struct PerHour {
	t          time.Time
	label      string
	amount     int
	percentage int
	color      string
}

fn (mut app App) get_all() ![]Person {
	return sql app.db {
		select from Person order by id desc
	}!
}

fn (mut app App) get_last_delivered() ![]Person {
	return sql app.db {
		select from Person order by delivery_time desc limit 1
	}!
}

fn (mut app App) get_ordered_per_hour() ![]PerHour {
	people := sql app.db {
		select from Person
	}!

	grouped := arrays.group_by(people, fn (p Person) string {
		return '${p.order_time.hour}:${int(p.order_time.minute / 30) * 30} ${p.order_time.day}/${p.order_time.month}'
	})

	max_per_hour := arrays.max(grouped.values().map(it.len)) or { 1 } + 10

	mut grouped_arr := maps.to_array(grouped, fn [max_per_hour] (k string, v []Person) PerHour {
		return PerHour{
			t: v[0].order_time
			label: k
			amount: v.len
			percentage: int(v.len * 100 / max_per_hour)
			color: (if v[0].order_time.hour % 2 == 0 { 'green' } else { 'red' })
		}
	})
	grouped_arr.sort(a.t < b.t)
	return grouped_arr
}

fn (mut app App) get_finished_per_hour() ![]PerHour {
	people := sql app.db {
		select from Person where status == 3
	}!

	grouped := arrays.group_by(people, fn (p Person) string {
		return '${p.order_time.hour}:${int(p.order_time.minute / 30) * 30} ${p.order_time.day}/${p.order_time.month}'
	})

	max_per_hour := arrays.max(grouped.values().map(it.len)) or { 1 } + 10

	mut grouped_arr := maps.to_array(grouped, fn [max_per_hour] (k string, v []Person) PerHour {
		return PerHour{
			t: v[0].order_time
			label: k
			amount: v.len
			percentage: int(v.len * 100 / max_per_hour)
			color: (if v[0].order_time.hour % 2 == 0 { 'green' } else { 'red' })
		}
	})
	grouped_arr.sort(a.t < b.t)
	return grouped_arr
}

fn (mut app App) get_ppu() !f64 {
	mut people := sql app.db {
		select from Person where status == 3
	}!
	if people.len == 0 {
		return 0
	}
	people.sort(a.order_time < b.order_time)
	time_range := people.last().order_time - people.first().order_time
	return people.len / time_range.hours()
}

fn (mut app App) get_mean_time_between_pannenkoeken() !time.Duration {
	time_zero := time.Time{
		unix: 0
	}
	mut people := sql app.db {
		select from Person where (status == 3 && delivery_time > time_zero) order by delivery_time desc limit 10
	}!
	return stats.mean(arrays.window(people, size: 2).map(it[0].delivery_time - it[1].delivery_time))
}

fn (mut app App) get_last_done_person() ![]Person {
	people := sql app.db {
		select from Person where status == 3 order by delivery_time desc limit 1
	}!
	return people
}

fn (mut app App) get_next_person() ![]Person {
	people := sql app.db {
		select from Person where status < 3 order by id limit 1
	}!
	return people
}

fn (mut app App) do_status_update(user_id int) !Person {
	people := sql app.db {
		select from Person where id == user_id
	}!
	person := people.first()
	sql app.db {
		update Person set status = person.status + 1 where id == person.id
	}!
	if person.status == 2 {
		sql app.db {
			update Person set delivery_time = time.now() where id == person.id
		}!
	}
	return person
}

fn (mut app App) do_add_person(name string, remark string) ! {
	people := sql app.db {
		select from Person where name == name && status < 3
	}!

	if people.len == 0 {
		p := Person{
			status: 0
			order_time: time.now()
			name: name
			remark: remark
		}
		sql app.db {
			insert p into Person
		}!
	}
}

// === WEB ===

struct App {
	vweb.Context
mut:
	db sqlite.DB
}

pub fn (mut app App) before_request() {
	println('[Vweb] ${app.Context.req.method} ${app.Context.req.url}')
}

fn main() {
	println('Start 🥞 webserver')
	mut db := create_db_connection() or { panic(err) }

	sql db {
		create table Person
	} or { panic('error on create table: ${err}') }

	// db.close() or { panic(err) }

	vweb.run(&App{
		db: db
	}, http_port)
}

@['/'; get]
pub fn (mut app App) home() vweb.Result {
	people := app.get_people() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	person_finished_count := app.get_finished_count() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	finished_per_hour := app.get_finished_per_hour() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	ordered_per_hour := app.get_ordered_per_hour() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	// pannenkoek per uur
	ppu := app.get_ppu() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	all_people := app.get_all() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	mean_time := app.get_mean_time_between_pannenkoeken() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	mut last_delivered := app.get_last_delivered() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	if last_delivered.len == 0 {
		last_delivered << Person{
			delivery_time: time.now()
		}
	}
	// Time to pannenkoek
	time_since_last := (time.now() - last_delivered.first().delivery_time)
	ttp := time.unix(i64(mean_time.seconds() - time_since_last.seconds())) - time.unix(0)

	return $vweb.html()
}

@['/banner'; get]
pub fn (mut app App) banner() vweb.Result {
	last_done := app.get_last_done_person() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	next_person := app.get_next_person() or {
		app.set_status(400, '')
		return app.text('${err}')
	}
	now := time.now()

	return $vweb.html()
}

@['/status_update'; post]
pub fn (mut app App) status_update() vweb.Result {
	if person := app.do_status_update(app.form['id'].int()) {
		if person.status == 1 {
			spawn fn () {
				http.post('http://10.1.0.224:8080/blink', '') or {}
			}()
			spawn fn (name string) {
				http.post('http://10.1.2.3', 'ScrollingText >>> ${name} <<< Enjoy! ') or {}
				http.post('http://10.1.2.3', 'Option text_trailingWhitespace 1') or {}
			}(person.name)
		}
	}

	return app.redirect('/')
}

@['/add_person'; post]
pub fn (mut app App) add_person() vweb.Result {
	name := app.form['name']
	if name.len == 0 {
		return app.redirect('/')
	}

	app.do_add_person(app.form['name'], app.form['remark']) or {
		app.set_status(400, '')
		return app.text('${err}')
	}

	return app.redirect('/')
}