package resolvers

import (
	"context"
	"errors"
	"strings"
	"time"

	"git.aiterp.net/rpdata/api/graph2/graphcore"
	"git.aiterp.net/rpdata/api/internal/auth"
	"git.aiterp.net/rpdata/api/internal/loader"
	"git.aiterp.net/rpdata/api/models"
	"git.aiterp.net/rpdata/api/models/changekeys"
	"git.aiterp.net/rpdata/api/models/changes"
	"git.aiterp.net/rpdata/api/models/channels"
	"git.aiterp.net/rpdata/api/models/logs"
	"github.com/99designs/gqlgen/graphql"
)

// Queries

func (r *queryResolver) Log(ctx context.Context, id string) (*models.Log, error) {
	log, err := logs.FindID(id)
	if err != nil {
		return nil, err
	}

	return &log, nil
}

func (r *queryResolver) Logs(ctx context.Context, filter *logs.Filter) ([]*models.Log, error) {
	logs, err := logs.List(filter)
	if err != nil {
		return nil, err
	}

	reqCtx := graphql.GetRequestContext(ctx)
	maybeCharacters := strings.Contains(reqCtx.RawQuery, "characters")
	maybeChannels := strings.Contains(reqCtx.RawQuery, "channels")

	if len(logs) >= 100 && (maybeCharacters || maybeChannels) {
		loader := loader.FromContext(ctx)
		if loader == nil {
			return nil, errors.New("no loader")
		}

		for _, log := range logs {
			if maybeChannels {
				loader.PrimeChannels("name", log.ChannelName)
			}

			if maybeCharacters {
				loader.PrimeCharacters("id", log.CharacterIDs...)
			}
		}
	}

	logs2 := make([]*models.Log, len(logs))
	for i := range logs {
		logs2[i] = &logs[i]
	}

	return logs2, nil
}

// Mutations

func (r *mutationResolver) AddLog(ctx context.Context, input graphcore.LogAddInput) (*models.Log, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("log.add") {
		return nil, errors.New("You are not permitted to add logs")
	}

	open := input.Open != nil && *input.Open == true
	title := ""
	if input.Title != nil {
		title = *input.Title
	}
	event := ""
	if input.Event != nil {
		event = *input.Event
	}
	description := ""
	if input.Description != nil {
		description = *input.Description
	}

	existingChannel, _ := channels.FindName(input.Channel)

	log, err := logs.Add(input.Date, input.Channel, title, event, description, open)
	if !token.Authenticated() || !token.Permitted("log.add") {
		return nil, errors.New("Failed to create log: " + err.Error())
	}

	go func() {
		if existingChannel.Name == "" {
			channel, err := channels.FindName(input.Channel)
			if err == nil {
				changes.Submit("Channel", "add", token.UserID, true, changekeys.Listed(channel), channel)
			}
		}

		changes.Submit("Log", "add", token.UserID, true, changekeys.Listed(log), log)
	}()

	return &log, nil
}

func (r *mutationResolver) ImportLog(ctx context.Context, input graphcore.LogImportInput) ([]*models.Log, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("log.add") {
		return nil, errors.New("You are not permitted to add logs")
	}

	date := time.Time{}
	if input.Date != nil {
		date = *input.Date
	}

	tz := time.UTC
	if input.Timezone != nil {
		parsedTZ, err := time.LoadLocation(*input.Timezone)
		if err != nil {
			return nil, errors.New("Unknown timezone: " + *input.Timezone)
		}

		tz = parsedTZ
	}

	results, err := logs.Import(input.Importer, date, tz, input.ChannelName, input.Data)
	if err != nil {
		return nil, err
	}

	newLogs := make([]*models.Log, 0, len(results))
	for _, result := range results {
		go func(result logs.ImportedLog) {
			changes.Submit("Log", "add", token.UserID, true, changekeys.Many(result.Log), result.Log)
			changes.Submit("Post", "add", token.UserID, true, changekeys.Many(result.Log, result.Posts), result.Posts)
		}(result)

		log, err := logs.UpdateCharacters(result.Log, nil)
		if err != nil {
			log = result.Log
		}

		newLogs = append(newLogs, &log)
	}

	return newLogs, nil
}

func (r *mutationResolver) EditLog(ctx context.Context, input graphcore.LogEditInput) (*models.Log, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("log.edit") {
		return nil, errors.New("You are not permitted to edit logs")
	}

	log, err := logs.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Log not found")
	}

	log, err = logs.Edit(log, input.Title, input.Event, input.Description, input.Open)
	if err != nil {
		return nil, errors.New("Failed to edit log: " + err.Error())
	}

	go changes.Submit("Log", "edit", token.UserID, true, changekeys.Listed(log), log)

	return &log, nil
}

func (r *mutationResolver) RemoveLog(ctx context.Context, input graphcore.LogRemoveInput) (*models.Log, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("log.remove") {
		return nil, errors.New("You are not permitted to remove logs")
	}

	log, err := logs.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Log not found")
	}

	log, err = logs.Remove(log)
	if err != nil {
		return nil, errors.New("Failed to remove log: " + err.Error())
	}

	go changes.Submit("Log", "remove", token.UserID, true, changekeys.Listed(log), log)

	return &log, nil
}