package resolvers

import (
	"context"
	"time"

	"github.com/MichaelMure/git-bug/bug"
	"github.com/MichaelMure/git-bug/graphql/connections"
	"github.com/MichaelMure/git-bug/graphql/graph"
	"github.com/MichaelMure/git-bug/graphql/models"
	"github.com/MichaelMure/git-bug/identity"
)

var _ graph.BugResolver = &bugResolver{}

type bugResolver struct{}

func (bugResolver) ID(ctx context.Context, obj *bug.Snapshot) (string, error) {
	return obj.Id().String(), nil
}

func (bugResolver) HumanID(ctx context.Context, obj *bug.Snapshot) (string, error) {
	return obj.Id().Human(), nil
}

func (bugResolver) Status(ctx context.Context, obj *bug.Snapshot) (models.Status, error) {
	return convertStatus(obj.Status)
}

func (bugResolver) Comments(ctx context.Context, obj *bug.Snapshot, after *string, before *string, first *int, last *int) (*models.CommentConnection, error) {
	input := models.ConnectionInput{
		Before: before,
		After:  after,
		First:  first,
		Last:   last,
	}

	edger := func(comment bug.Comment, offset int) connections.Edge {
		return models.CommentEdge{
			Node:   &comment,
			Cursor: connections.OffsetToCursor(offset),
		}
	}

	conMaker := func(edges []*models.CommentEdge, nodes []bug.Comment, info *models.PageInfo, totalCount int) (*models.CommentConnection, error) {
		var commentNodes []*bug.Comment
		for _, c := range nodes {
			commentNodes = append(commentNodes, &c)
		}
		return &models.CommentConnection{
			Edges:      edges,
			Nodes:      commentNodes,
			PageInfo:   info,
			TotalCount: totalCount,
		}, nil
	}

	return connections.CommentCon(obj.Comments, edger, conMaker, input)
}

func (bugResolver) Operations(ctx context.Context, obj *bug.Snapshot, after *string, before *string, first *int, last *int) (*models.OperationConnection, error) {
	input := models.ConnectionInput{
		Before: before,
		After:  after,
		First:  first,
		Last:   last,
	}

	edger := func(op bug.Operation, offset int) connections.Edge {
		return models.OperationEdge{
			Node:   op,
			Cursor: connections.OffsetToCursor(offset),
		}
	}

	conMaker := func(edges []*models.OperationEdge, nodes []bug.Operation, info *models.PageInfo, totalCount int) (*models.OperationConnection, error) {
		return &models.OperationConnection{
			Edges:      edges,
			Nodes:      nodes,
			PageInfo:   info,
			TotalCount: totalCount,
		}, nil
	}

	return connections.OperationCon(obj.Operations, edger, conMaker, input)
}

func (bugResolver) Timeline(ctx context.Context, obj *bug.Snapshot, after *string, before *string, first *int, last *int) (*models.TimelineItemConnection, error) {
	input := models.ConnectionInput{
		Before: before,
		After:  after,
		First:  first,
		Last:   last,
	}

	edger := func(op bug.TimelineItem, offset int) connections.Edge {
		return models.TimelineItemEdge{
			Node:   op,
			Cursor: connections.OffsetToCursor(offset),
		}
	}

	conMaker := func(edges []*models.TimelineItemEdge, nodes []bug.TimelineItem, info *models.PageInfo, totalCount int) (*models.TimelineItemConnection, error) {
		return &models.TimelineItemConnection{
			Edges:      edges,
			Nodes:      nodes,
			PageInfo:   info,
			TotalCount: totalCount,
		}, nil
	}

	return connections.TimelineItemCon(obj.Timeline, edger, conMaker, input)
}

func (bugResolver) LastEdit(ctx context.Context, obj *bug.Snapshot) (*time.Time, error) {
	t := obj.LastEditTime()
	return &t, nil
}

func (bugResolver) Actors(ctx context.Context, obj *bug.Snapshot, after *string, before *string, first *int, last *int) (*models.IdentityConnection, error) {
	input := models.ConnectionInput{
		Before: before,
		After:  after,
		First:  first,
		Last:   last,
	}

	edger := func(actor identity.Interface, offset int) connections.Edge {
		return models.IdentityEdge{
			Node:   actor,
			Cursor: connections.OffsetToCursor(offset),
		}
	}

	conMaker := func(edges []*models.IdentityEdge, nodes []identity.Interface, info *models.PageInfo, totalCount int) (*models.IdentityConnection, error) {
		return &models.IdentityConnection{
			Edges:      edges,
			Nodes:      nodes,
			PageInfo:   info,
			TotalCount: totalCount,
		}, nil
	}

	return connections.IdentityCon(obj.Actors, edger, conMaker, input)
}

func (bugResolver) Participants(ctx context.Context, obj *bug.Snapshot, after *string, before *string, first *int, last *int) (*models.IdentityConnection, error) {
	input := models.ConnectionInput{
		Before: before,
		After:  after,
		First:  first,
		Last:   last,
	}

	edger := func(participant identity.Interface, offset int) connections.Edge {
		return models.IdentityEdge{
			Node:   participant,
			Cursor: connections.OffsetToCursor(offset),
		}
	}

	conMaker := func(edges []*models.IdentityEdge, nodes []identity.Interface, info *models.PageInfo, totalCount int) (*models.IdentityConnection, error) {
		return &models.IdentityConnection{
			Edges:      edges,
			Nodes:      nodes,
			PageInfo:   info,
			TotalCount: totalCount,
		}, nil
	}

	return connections.IdentityCon(obj.Participants, edger, conMaker, input)
}