package model

import (
	"fmt"
	"sync"

	"github.com/davecgh/go-spew/spew"
	"github.com/strongdm/comply/internal/config"
)

var tsPluginsMu sync.Mutex
var tsPlugins = make(map[TicketSystem]TicketPlugin)
var tsConfigureOnce sync.Once

// TicketSystem is the type of ticket database.
type TicketSystem string

const (
	// JIRA from Atlassian.
	JIRA = TicketSystem("jira")
	// Github from Github.
	Github = TicketSystem("github")
)

// TicketPlugin models support for ticketing systems.
type TicketPlugin interface {
	Get(ID string) (*Ticket, error)
	FindOpen() ([]*Ticket, error)
	FindByTag(name, value string) ([]*Ticket, error)
	FindByTagName(name string) ([]*Ticket, error)
	Create(ticket *Ticket, labels []string) error
	Configure(map[string]interface{}) error
	Prompts() map[string]string
}

// GetPlugin loads the ticketing database.
func GetPlugin(ts TicketSystem) TicketPlugin {
	tsPluginsMu.Lock()
	defer tsPluginsMu.Unlock()

	tp, ok := tsPlugins[ts]
	if !ok {
		panic("Unknown ticket system: " + ts)
	}

	if config.Exists() {
		tsConfigureOnce.Do(func() {
			ticketsMap := config.Config().Tickets

			cfg, ok := ticketsMap[string(ts)]
			if !ok {
				spew.Dump(cfg)
				panic(fmt.Sprintf("Missing configuration for plugin system; add `%s` block to project YAML", string(ts)))
			}

			cfgTyped, ok := cfg.(map[interface{}]interface{})
			if !ok {
				spew.Dump(cfg)
				panic(fmt.Sprintf("malformatted ticket configuration block `%s` in project YAML", string(ts)))
			}

			cfgStringed := make(map[string]interface{})
			for k, v := range cfgTyped {
				kS, ok := k.(string)
				if !ok {
					spew.Dump(cfgStringed)
					panic(fmt.Sprintf("malformatted key in configuration block `%s` in project YAML", string(ts)))
				}
				cfgStringed[kS] = v
			}

			tp.Configure(cfgStringed)
		})
	}

	return tp
}

// Register ticketing system plugin.
func Register(ts TicketSystem, plugin TicketPlugin) {
	tsPluginsMu.Lock()
	defer tsPluginsMu.Unlock()
	_, ok := tsPlugins[ts]
	if ok {
		panic("Duplicate ticketing system registration: " + ts)
	}

	tsPlugins[ts] = plugin
}