/*
 * v1 Controller
 * -------------------------------------------------------------
 * Put some description here!
 */
const Project = _flitter.model('v1:Project')
const Out = _flitter.model('v1:Out')
const Invite = _flitter.model('v1:Invite')
const Snippet = _flitter.model('v1:Snippet')
const share_api = {
    project: Project,
    snippet: Snippet,
}
const share_views = {
    project: async function(item){
        return '/dash/v1/project/view/'+item.id
    },
    snippet: async function(item){
        const project = await Project.findById(item.project_id);
        return '/dash/v1/project/snippet/'+project.id+'/view/'+item.uuid
    },
}
class v1 {

    /*
     * Serve the main page.
     */
    async main(req, res){

        const projects = await Project.find({ archived: false, user_id: req.session.auth.uuid })
        
        let view_find = {
            shared_user_ids: {
                $elemMatch: {
                    $eq: req.session.auth.uuid
                }
            }
        }

        let edit_find = {
            edit_user_ids: {
                $elemMatch: {
                    $eq: req.session.auth.uuid
                }
            }
        }
        
        const shared_projects = {
            view: await Project.find(view_find),
            edit: await Project.find(edit_find),
        }

        const shared_snippets = {
            view: await Snippet.find(view_find),
            edit: await Snippet.find(edit_find),
        }

        /*
         * Return the main view.
         * It must be passed the response.
         * View parameters can be passed as an optional third
         * argument to the view() method.
         */
        return _flitter.view(res, 'dash_v1:main', { projects, shared_projects, shared_snippets, user: req.session.auth.user })
    }

    new_project_show(req, res, next){
        return _flitter.view(res, 'dash_v1:project', { show_back: true, title: 'Create New Project' })
    }

    async project_edit_show(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ){
            return _flitter.error(res, 404, {reason: 'Project not found with the specified ID.'})
        }
        
        // check access perms
        if ( !await devbug.permission.project.edit(project, req.session.auth.user) ){
            return _flitter.error(res, 401, {reason: 'You do not have permissions to edit this project.'})
        }

        return _flitter.view(res, 'dash_v1:project', { show_back: true, title: 'Update Project', project_name: project.name, user: req.session.auth.user })
    }

    async project_edit_do(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ){
            return _flitter.error(res, 404, {reason: 'Project not found with the specified ID.'})
        }

        if ( !req.body || !req.body.name ){
            return _flitter.view(res, 'dash_v1:project', {user: req.session.auth.user, show_back: true, title: 'Update Project', project_name: project.name, errors: ['Project name is required.']})
        }
        
        // check access perms
        if ( !await devbug.permission.project.edit(project, req.session.auth.user) ){
            return _flitter.error(res, 401, {reason: 'You do not have permissions to edit this project.'})
        }

        project.name = req.body.name
        await project.save()

        return res.redirect('/dash/v1')
    }

    async new_project_do(req, res, next){
        if ( !req.body.name ){
            return _flitter.view(res, 'dash_v1:project', {user: req.session.auth.user, show_back: true, title: 'Create Project', errors: ['Project name is required.']})
        }

        const project = new Project({
            name: req.body.name,
            user_id: req.session.auth.uuid,
            data: JSON.stringify({
                created: Date.now(),
                modified: Date.now()
            }),
            shared_user_ids: [],
        })

        await project.save()

        return res.redirect('/dash/v1')
    }

    async project_view(req, res, next){
        const project = await Project.findById(req.params.id)

        if ( !project ){
            return _flitter.error(res, 404, {reason: 'Project not found with the specified ID.'})
        }

        const outs = await Out.find({ project_id: project.id }).sort('-created')

        const snippets = await Snippet.find({project_id: project.id})
    
        if ( !await devbug.permission.project.view(project, req.session.auth.user) ){
            return _flitter.error(res, 401, {reason: 'You do not have permission to view this project.'})
        }
        
        return _flitter.view(res, 'dash_v1:view', {user: req.session.auth.user, snippets, project, outs, show_back: true, title: 'View: '+project.name })
    }

    async out_view(req, res, next){
        const out = await Out.findById(req.params.id)
        
        if ( !out ){
            return _flitter.error(res, 404, {reason: 'Output not found with the specified ID.'})
        }
    
        let pretty
        try {
            pretty = JSON.stringify(JSON.parse(out.data), null, 4)
            console.log('Pretty out: ', pretty)
        }
        catch (e){
            return _flitter.error(res, 500, {reason: 'Unable to parse output data. Data contains invalid JSON.'})
        }
        
        const project = await Project.findById(out.project_id)

        if ( !project || (!await devbug.permission.project.view(project, req.session.auth.user)) ){
            return _flitter.error(res, 401, {reason: 'You do not have permission to view this project.'})
        }
        
        return _flitter.view(res, 'dash_v1:out', {project, user: req.session.auth.user, out, prettyd:pretty, show_back: true, title: out.brief, title_small: true });
    }
    
    async out_delete(req, res, next){
        const out = await Out.findById(req.params.id)

        const project = await Project.findById(req.params.project)
        if ( !project || ( !await devbug.permission.project.edit(project, req.session.auth.user) ) ){
            return _flitter.error(res, 401, {reason: 'You do not have permission to edit this project.'})
        }
        
        if ( out ){
            await out.delete()
        }
        
        return res.redirect('/dash/v1/project/view/'+req.params.project)
    }

    async project_delete_show(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ){
            return _flitter.error(res, 404, {reason: 'Project not found with the specified ID.'})
        }
        
        if ( !await devbug.permission.project.owns(project, req.session.auth.user) ){
            return _flitter.error(res, 401, {reason: 'You do not have permission to edit this project.'})
        }
        
        return _flitter.view(res, 'dash_v1:confirm', {user: req.session.auth.user, project, show_back: true, title: 'Are you sure?', text: 'Deleting this project will remove all stored breakpoint data. This action cannot be undone.', destination: '/dash/v1/project/delete/'+req.params.id})
    }

    async project_delete_do(req, res, next){
        const project = await Project.findById(req.params.id)
        
        if ( project && ( !await devbug.permission.project.owns(project, req.session.auth.user) ) ){
            return _flitter.error(res, 401, {reason: 'You do not have permission to edit this project.'})
        }
        
        if ( project ){
            const outs = await Out.find({project_id: project.id})

            for ( const key in outs ){
                await outs[key].delete()
            }

            await project.delete()
        }

        return res.redirect('/dash/v1')
    }

    view_code(req, res, next){
        return _flitter.view(res, 'dash_v1:code', { user: req.session.auth.user, title: 'Using DevBug Inline' })
    }

    async project_share_show(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        
        if ( !project ) return _flitter.error(res, 404, {reason: req.params.api+' not found with the specified ID.'})
        
        if ( !await devbug.permission[req.params.api].owns(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to edit this '+req.params.api+'.'})
        
        // Find read-only users
        const read_find = {
            uuid: { $in: [] }
        }
        read_find.uuid.$in = read_find.uuid.$in.concat(project.shared_user_ids)

        const read = await _flitter.model('User').find(read_find)

        // Find edit users
        const edit_find = {
            uuid: { $in : [] }
        }
        edit_find.uuid.$in = edit_find.uuid.$in.concat(project.edit_user_ids)

        const edit = await _flitter.model('User').find(edit_find)

        // Find other users
        const other_find = {
            uuid: { $nin: [ project.user_id ] }
        }
        other_find.uuid.$nin = other_find.uuid.$nin.concat(project.edit_user_ids).concat(project.shared_user_ids)

        const other = await _flitter.model('User').find(other_find)

        // Get the owner user
        const owner = await _flitter.model('User').findOne({ uuid: project.user_id })

        const sharing = {
            read,
            edit, 
            other, 
            owner,
            current_owns: (project.user_id === req.session.auth.uuid)
        }
        
        return _flitter.view(res, 'dash_v1:share', { user: req.session.auth.user, sharing, item: project, api: req.params.api, title: 'Share '+req.params.api+': '+project.name, show_back: true })
    }
    
    async project_share_do(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: req.params.api+' not found with the specified ID.'})
        
        const target_user = await _flitter.model('User').findOne({uuid: req.params.user})
        if ( !target_user ) return _flitter.error(res, 404, {reason: 'User not found with the specified ID.'})
        
        if ( !await devbug.permission[req.params.api].owns(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: "You do not have permission to edit this "+req.params.api+"."})
        
        if ( !(project.user_id === target_user.uuid) && !(project.shared_user_ids.includes(target_user.uuid)) ){
            project.shared_user_ids.push(target_user.uuid)
            await project.save()
        }
        
        return res.redirect('/dash/v1/'+req.params.api+'/share/'+project.id)
    }

    async project_share_edit_do(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'Project not found with the specified ID.'})

        const target_user = await _flitter.model('User').findOne({uuid: req.params.user})
        if ( !target_user ) return _flitter.error(res, 404, {reason: 'User not found with the specified ID.'})

        if ( !await devbug.permission[req.params.api].owns(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: "You do not have permission to edit this "+req.params.api+"."})

        if ( !(project.user_id === target_user.uuid) && !(project.edit_user_ids.includes(target_user.uuid)) ){
            // check if read access. If so, revoke.
            if ( project.shared_user_ids.includes(target_user.uuid) ){
                project.shared_user_ids.splice(project.shared_user_ids.indexOf(target_user.uuid), 1)
            }

            project.edit_user_ids.push(target_user.uuid)
            await project.save()
        }

        return res.redirect('/dash/v1/'+req.params.api+'/share/'+project.id)
    }
    
    async project_share_revoke(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: req.params.api+' not found with the specified ID.'})
        
        const target_user = await _flitter.model('User').findOne({uuid: req.params.user})
        if ( !target_user ) return _flitter.error(res, 404, {reason: 'User not found with the specified ID.'})
        
        if ( !await devbug.permission[req.params.api].view(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: "You do not have permission to edit this "+req.params.api+"."})
        
        const to_dash = project.shared_user_ids.includes(req.session.auth.uuid)
        
        if ( !(target_user.uuid === project.user_id) && (project.shared_user_ids.includes(target_user.uuid)) ){
            project.shared_user_ids.splice(project.shared_user_ids.indexOf(target_user.uuid), 1)
            await project.save()
        }
        
        if ( to_dash ) return res.redirect('/dash/v1')
        
        return res.redirect('/dash/v1/'+req.params.api+'/share/'+project.id)
    }

    async project_share_revoke_edit(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: req.params.api+' not found with the specified ID.'})
        
        const target_user = await _flitter.model('User').findOne({uuid: req.params.user})
        if ( !target_user ) return _flitter.error(res, 404, {reason: 'User not found with the specified ID.'})
        
        if ( !await devbug.permission[req.params.api].view(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: "You do not have permission to edit this "+req.params.api+"."})
        
        const to_dash = project.edit_user_ids.includes(req.session.auth.uuid)
        
        if ( !(target_user.uuid === project.user_id) && (project.edit_user_ids.includes(target_user.uuid)) ){
            project.edit_user_ids.splice(project.edit_user_ids.indexOf(target_user.uuid), 1)
            await project.save()
        }
        
        if ( to_dash ) return res.redirect('/dash/v1')
        
        return res.redirect('/dash/v1/'+req.params.api+'/share/'+project.id)
    }
    
    async project_share_transfer(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: req.params.api+' not found with the specified ID.'})
        
        const target_user = await _flitter.model('User').findOne({uuid: req.params.user})
        if ( !target_user ) return _flitter.error(res, 404, {reason: 'User not found with the specified ID.'})
        
        if ( !await devbug.permission[req.params.api].owns(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to edit this '+req.params.api+'.'})
        
        project.user_id = target_user.uuid
        project.shared_user_ids.push(req.session.auth.uuid)

        if ( project.shared_user_ids.includes(target_user.uuid) ){
            project.shared_user_ids.splice(project.shared_user_ids.indexOf(target_user.uuid), 1)
        }

        if ( project.edit_user_ids.includes(target_user.uuid) ){
            project.edit_user_ids.splice(project.edit_user_ids.indexOf(target_user.uuid), 1)
        }
        
        await project.save()
        
        return res.redirect('/dash/v1')
    }

    async project_share_invite(req, res, next){
        const share_model = share_api[req.params.api]
        if ( !share_model ) return _flitter.error(res, 400, {reason: 'Invalid Share API endpoint.'})
        const project = await share_model.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: req.params.api+' not found with the specified ID.'})

        if ( !await devbug.permission[req.params.api].owns(project, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to edit this '+req.params.api+'.'})

        let share_data = {
            project_id: project.id,
            api_type: req.params.api,
            by_user_id: req.session.auth.uuid,
            created_on: Date.now()
        }

        const share = new Invite(share_data)
        await share.save()

        return _flitter.view(res, 'dash_v1:invite', {share, project, title: 'Sharing link for '+req.params.api, show_back: true})
    }

    async accept_invite(req, res, next){
        if ( !req.session.invite ) return res.redirect('/dash/v1')

        const invite = await Invite.findById(req.session.invite_data.invite)
        if ( !invite ) return _flitter.error(res, 404, {reason: 'This invitation is no longer valid. Sorry.'})

        const share_model = share_api[invite.api_type];
        const project = await share_model.findById(req.session.invite_data.project)
        if ( !project ) return _flitter.error(res, 404, {reason: 'This '+invite.api_type+' no longer exists.'})

        const user = await _flitter.model('User').findById(req.session.invite_data.user)
        if ( !user ) return _flitter.error(res, 404, {reason: 'This user no longer exists. Sorry.'})

        if ( !project.shared_user_ids.includes(req.session.auth.uuid) && !(project.user_id === req.session.auth.uuid) ){
            project.shared_user_ids.push(req.session.auth.uuid)
            await project.save()
        }

        invite.used = true
        await invite.save()

        req.session.invite = false
        req.session.invite_data = false
        return res.redirect(await share_views[invite.api_type](project))
    }

    async project_snippet_new(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'The specified project does not exist.'})

        return _flitter.view(res, 'dash_v1:snippet', {project, user: req.session.auth.user, title: 'Create Snippet', show_back: true});
    }

    async project_snippet_new_do(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'The specified project does not exist.'})

        if ( !req.body.title || !req.body.data ){
            return _flitter.view(res, 'dash_v1:snippet', {project, user: req.session.auth.user, title: 'Create Snippet', show_back: true})
        }
        
        // check required fields: title, data, mode
        let fail = false
        
        if ( !req.body.title ) fail = 'Snippet title is required.'
        else if ( !req.body.data ) fail = 'Snippet data is required.'
        else if ( !req.body.mode ) fail = 'Snippet mode is required.'
        
        if ( fail ){
            return _flitter.view(res, 'dash_v1:snippet', {project, user: req.session.auth.user, title: 'Create Snippet', show_back: true, errors:[fail]})
        }

        const snippet_data = {
            name: req.body.title,
            data: req.body.data,
            mode: req.body.mode,
            user_id: req.session.auth.uuid,
            project_id: project.id,
        }
        
        console.log({snippet_data})

        const snippet = new Snippet(snippet_data)
        await snippet.save()

        return res.redirect('/dash/v1/project/snippet/'+req.params.id+'/view/'+snippet.uuid)
    }

    // TODO access checks
    async project_snippet_view(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'The specified project does not exist.'})

        const snippet = await Snippet.findOne({uuid: req.params.snippet})
        if ( !snippet ) return _flitter.error(res, 404, {reason: 'The specified snippet does not exist.'})

        if ( !await devbug.permission.snippet.view(snippet, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to view this snippet.'})

        const is_owner = await devbug.permission.snippet.owns(snippet, req.session.auth.user)

        return _flitter.view(res, 'dash_v1:snippet', {snippet, project, is_owner, user: req.session.auth.user, title: 'Snippet: '+snippet.name, show_back: true, readonly: true})
    }

    async project_snippet_delete(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'The specified project does not exist.'})

        const snippet = await Snippet.findOne({uuid: req.params.snippet})
        if ( !snippet ) return _flitter.error(res, 404, {reason: 'The specified snippet does not exist.'})

        if ( !await devbug.permission.snippet.owns(snippet, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to edit this snippet.'})
        
        await snippet.delete()
        return res.redirect('/dash/v1/project/view/'+project.id)
    }

    async project_snippet_edit(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'The specified project does not exist.'})

        const snippet = await Snippet.findOne({uuid: req.params.snippet})
        if ( !snippet ) return _flitter.error(res, 404, {reason: 'The specified snippet does not exist.'})

        if ( !await devbug.permission.snippet.edit(snippet, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to edit this snippet.'})
        
        return _flitter.view(res, 'dash_v1:snippet', {project, snippet, user: req.session.auth.user, title: 'Snippet: '+snippet.name, readonly: false, show_back: true})
    }

    async project_snippet_edit_do(req, res, next){
        const project = await Project.findById(req.params.id)
        if ( !project ) return _flitter.error(res, 404, {reason: 'The specified project does not exist.'})

        const snippet = await Snippet.findOne({uuid: req.params.snippet})
        if ( !snippet ) return _flitter.error(res, 404, {reason: 'The specified snippet does not exist.'})

        if ( !await devbug.permission.snippet.edit(snippet, req.session.auth.user) ) return _flitter.error(res, 401, {reason: 'You do not have permission to edit this snippet.'})

        // check required fields: title, data, mode
        let fail = false
        
        if ( !req.body.title ) fail = 'Snippet title is required.'
        else if ( !req.body.data ) fail = 'Snippet data is required.'
        else if ( !req.body.mode ) fail = 'Snippet mode is required.'
        
        if ( fail ){
            return _flitter.view(res, 'dash_v1:snippet', {snippet, project, user: req.session.auth.user, title: 'Update Snippet', show_back: true, errors:[fail]})
        }

        snippet.name = req.body.title
        snippet.data = req.body.data
        snippet.mode = req.body.mode

        await snippet.save()

        return res.redirect('/dash/v1/project/snippet/'+project.id+'/view/'+snippet.uuid)
    }

    async show_usage_page(req, res, next){
        const valid_pages = ['main', 'node', 'php', 'ecma', 'api'];

        if ( !valid_pages.includes(req.params.page) ) return _flitter.error(res, 404, {reason: 'The page could not be found.'})

        const title = req.params.page.charAt(0).toUpperCase() + req.params.page.slice(1);

        return _flitter.view(res, 'dash_v1:use:'+req.params.page.replace(/\W/g, ''), {
            show_back: true,
            title: 'Using DevBug - '+title,
            user: req.session.auth.user,
        })
    }
}

module.exports = exports = v1