<?php

namespace App\Http\Controllers;

use App\Models\StatTreeLineClauseArg;
use App\Models\StatTreeLineReportColumn;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;
use App\Models\Clause;
use App\Models\StatTree;
use App\Models\StatTreeLine;
use App\Models\StatTreeLineClause;
use Carbon\Carbon;
use Illuminate\Support\Facades\DB;
use Ramsey\Uuid\Uuid;

class StatTreeController extends Controller
{
    public function list()
    {
        $statTrees = StatTree::all();
        return view('app.stat-tree.stat-trees.list', compact('statTrees'));
    }

    public function createPage()
    {
        return view('app.stat-tree.stat-trees.create');
    }
    public function dashboard(StatTree $statTree)
    {
        return view('app.stat-tree.stat-trees.sub.dashboard', compact('statTree'));
    }
    public function dashboard2(StatTree $statTree)
    {
        return view('app.stat-tree.stat-trees.sub.dashboard2', compact('statTree'));
    }

    public function create(Request $request)
    {
        $validatedData = Validator::make($request->all(), [
			'name' => 'required|string|unique:stat_tree',
            'model' => 'required|string',
            'slug' => 'required|string|unique:stat_tree'
		]);

		if ($validatedData->fails()) return $this->fail($validatedData->errors()->first());
        [
            'name' => $name,
            'model' => $model,
            'slug' => $slug
        ] = $request->all();

        $nextId = DB::select("select nextval('stat_tree_id_seq')");
        $statTree = new StatTree; 
        $statTree->id = $nextId[0]->nextval;
        $statTree->uid = Uuid::uuid4();
        $statTree->name = $name;
        $statTree->model = $model;
        $statTree->slug = $slug;
        $statTree->save();

        return $this->pass($statTree->uid);
    }

    public function updateBasic(Request $request) {
        $statTree = StatTree::where('uid', $request->input('uid'))->first();
        if(!$statTree) return $this->fail('Stat tree not found!');
        $statTree->name = $request->input('name');
        $statTree->model = $request->input('model');
        $statTree->slug = $request->input('slug');
        $statTree->save();
        return $this->pass();
    }

    public function edit(Request $request, StatTree $statTree) {
        return view('app.stat-tree.stat-trees.sub.edit', compact('statTree'));
    }

    public function delete(Request $request){
        $request->validate([
            'id' => 'required'
        ]);
        $id = $request->get('id');
        $statTree = StatTree::where('id', $id)->first();

    }

    public function replaceAllLines(Request $request){

        $parents = [];

        $columns = '';

        $statTreeID = (int) $request->get('statTreeID');
        $data = $request->get('data');
        $rows = json_decode($data, true);

        $statTree = StatTree::where('id', $statTreeID)->first();
        $model = $statTree->model;
        DB::beginTransaction();

        // cleanup junk
        DB::statement("DELETE FROM stat_tree_line WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_clause WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_clause_arg WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_clause_arg_value WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_report_column WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);

        for($x = 0; $x < count($rows); $x++){
            $row = $rows[$x];
            $nextStatLineId = DB::select("select nextval('stat_tree_line_id_seq')");
            $statTreeLine = new StatTreeLine;
            $statTreeLine->id = $nextStatLineId[0]->nextval;
            $statTreeLine->uid = Uuid::uuid4();
            $statTreeLine->stat_tree_id = $statTree->id;
            $statTreeLine->tree_order_position_index = $x;
            $statTreeLine->last_refresh_count = null;
            $statTreeLine->tsv_text_for_report_columns = null;
            $statTreeLine->save();

            $allClauses = [];
            for($i = 0; $i < count($row); $i++){
                $cell = $row[$i];
                if(!$cell || empty($cell)) continue;

                $parts = explode('==>', $cell);
                $cell = $parts[0];
                $columns = count($parts) > 1 ? $parts[1] : '';

                $clause = Clause::where('label', $cell)->where('model', 'ilike', $model)->first();
                if(!$clause){
                    DB::rollBack();
                    return $this->fail('No clause record found for ' . $cell);
                }
                $nextStatLineClauseId = DB::select("select nextval('stat_tree_line_clause_id_seq')");
                $statTreeLineClause = new StatTreeLineClause;
                $statTreeLineClause->id = $nextStatLineClauseId[0]->nextval;
                $statTreeLineClause->uid = Uuid::uuid4();
                $statTreeLineClause->stat_tree_line_id = $statTreeLine->id;
                $statTreeLineClause->clause_id = $clause->id;
                $statTreeLineClause->clause_label = $cell;
                $statTreeLineClause->position_index = $i;
                $statTreeLineClause->detail_json = json_encode(['model' => $model]);
                $statTreeLineClause->stat_tree_id = $statTree->id;
                $statTreeLineClause->save();

                // check if the clause has any clauseArgs, if yes, create stat-tree-line-clause-arg and value records for them
                if(count($clause->clauseArgs)) {
                    foreach ($clause->clauseArgs as $clauseArg) {
                        $statTreeLineClauseArg = new StatTreeLineClauseArg();
                        $nextId = DB::select("select nextval('stat_tree_line_clause_arg_id_seq')");
                        $statTreeLineClauseArg->id = $nextId[0]->nextval;
                        $statTreeLineClauseArg->stat_tree_line_clause_id = $statTreeLineClause->id;
                        $statTreeLineClauseArg->clause_arg_id = $clauseArg->id;
                        $statTreeLineClauseArg->access_level = 'ADMIN';
                        $statTreeLineClauseArg->stat_tree_id = $statTree->id;
                        $statTreeLineClauseArg->default_value = null;

                        // TODO: need to copy clause arg values from parent node for all except last clause

                        $statTreeLineClauseArg->save();
                    }
                }

                $allClauses[] = $cell;

                // fill report columns (if last clause)
                if($i === count($row) - 1 && !!$columns) {
                    $columns = explode(",", $columns);
                    for ($j = 0; $j < count($columns); $j++) {
                        $parts = explode("|", $columns[$j]);
                        $column = new StatTreeLineReportColumn();
                        $nextId = DB::select("select nextval('stat_tree_line_report_column_id_seq')");
                        $column->id = $nextId[0]->nextval;
                        $column->uid = Uuid::uuid4();
                        $column->stat_tree_line_id = $statTreeLine->id;
                        $column->label = $parts[1];
                        $column->display_key = $parts[0];
                        $positionIndex = DB::select("select max(position_index) from stat_tree_line_report_column where stat_tree_line_id = {$column->stat_tree_line_id}");
                        $column->position_index = is_numeric($positionIndex[0]->max) ? $positionIndex[0]->max + 1 : 1;
                        $column->stat_tree_id = $statTree->id;
                        $column->save();
                    }
                }

            }
            $parents[implode("|", $allClauses)] = $statTreeLine;

            // if child, find and set parent
            $nonEmpty = [];
            for($i = 0; $i < count($row); $i++){
                if($row[$i] && !empty($row[$i])) $nonEmpty[] = $row[$i];
            }
            if(count($nonEmpty) > 1) {
                $parentClauses = [];
                for($i = 0; $i < count($nonEmpty) - 1; $i++){
                    $cell = $nonEmpty[$i];
                    $parts = explode('==>', $cell);
                    $cell = $parts[0];
                    $columns = count($parts) > 1 ? $parts[1] : '';
                    $clause = Clause::where('label', $cell)->where('model', 'ilike', $model)->first();
                    if(!$clause){
                        DB::rollBack();
                        return $this->fail('No clause record found for ' . $cell);
                    }
                    $parentClauses[] = $clause->label;
                }
                $parentClauses = implode("|", $parentClauses);
                if(@$parents[$parentClauses]) {
                    $statTreeLine->parent_stat_tree_line_id = $parents[$parentClauses]->id;
                    $statTreeLine->save();
                }
            }

        }
        DB::commit();
        return $this->pass();
    }

    public function clausesJSON(Request $request, StatTree $statTree) {
        $clauses = Clause::where('model', $statTree->model)->orderBy('position_index')->get();
        $nodes = [];
        foreach ($clauses as $clause) {

            $children = [];

            // clause text child
            $children[] = [
                "text" => $clause->clause_text,
                "icon" => "fa fa-laptop-code text-primary text-sm",
                "state" => [
                    "opened" => false,
                    "disabled" => false,
                    "selected" => false,
                ],
                "li_attr" => [
                    "type" => "clause_text"
                ],
                "data" => [
                    "type" => "clause_text"
                ]
            ];

            // clause arg children
            $argsSystem = [];
            foreach ($clause->clauseArgs as $clauseArg) {
                $children[] = [
                    "text" => $clauseArg->arg_text . '<span class="text-secondary text-sm ml-2">' . $clauseArg->field_type . '</span>',
                    "icon" => "fa fa-cubes text-info",
                    "state" => [
                        "opened" => false,
                        "disabled" => false,
                        "selected" => false,
                    ],
                    "data" => [
                        "type" => "clause_arg",
                        "id" => $clauseArg->id,
                        "uid" => $clauseArg->uid,
                        "argText" => $clauseArg->arg_text,
                        "fieldType" => $clauseArg->field_type,
                        "clauseId" => $clause->id
                    ]
                ];
                $argsSystem[] = [
                    "arg_text" => $clauseArg->arg_text,
                    "field_type" => $clauseArg->field_type,
                    "default_value" => null,
                    "access_level" => null
                ];
            }

            $nodes[] = [
                "text" => $clause->label,
                "state" => [
                    "opened" => false,
                    "disabled" => false,
                    "selected" => false,
                ],
                "children" => $children,
                "data" => [
                    "type" => "clause",
                    "id" => $clause->id,
                    "uid" => $clause->uid,
                    "model" => $clause->model,
                    "question" => $clause->question,
                    "answer" => $clause->answer,
                    "label" => $clause->label,
                    "clauseText" => $clause->clause_text,
                    "clauseId" => $clause->id,
                    "args" => $argsSystem
                ]
            ];
        }

        return json_encode($nodes);
    }

    public function linesJSON(Request $request, StatTree $statTree) {
        $nodes = [];
        foreach ($statTree->rootLines as $rootLine) {
            $nodes[] = $this->lineObject($rootLine);
        }
        return json_encode($nodes);
    }

    private function lineObject(StatTreeLine  $line) {

        // columns
        $columns = [];
        foreach ($line->reportColumns as $column) {
            $columns[] = [
                "label" => $column->label,
                "display_key" => $column->display_key
            ];
        }

        // clause
        $lineClause = $line->displayLineClause();
        $args = [];
        foreach($lineClause->statTreeLineClauseArgs as $stlcArg) {
            if($stlcArg->clauseArg) {
                $args[] = [
                    "arg_text" => $stlcArg->clauseArg->arg_text,
                    "field_type" => $stlcArg->clauseArg->field_type,
                    "default_value" => $stlcArg->default_value,
                    "access_level" => $stlcArg->access_level
                ];
            }
        }
        $clause = [
            "clause_id" => $lineClause->clause_id,
            "clause_label" => $lineClause->clause_label,
            "position_index" => $lineClause->position_index,
            "args" => $args
        ];

        $children = [];
        foreach ($line->children as $child) {
            $children[] = $this->lineObject($child);
        }
        return [
            "text" => $line->displayLabel() . '<span class="ml-2 text-secondary">(' . (is_null($line->last_refresh_count) ? '…' : $line->last_refresh_count) . ')</span>',
            "state" => [
                "opened" => true,
                "disabled" => false,
                "selected" => false,
            ],
            "children" => $children,
            "data" => [
                "type" => "stat_tree_line",
                "id" => $line->id,
                "uid" => $line->uid,
                "displayLabel" => $line->displayLabel(),
                "lastRefreshCount" => $line->last_refresh_count,
                "treeOrderPositionIndex" => $line->tree_order_position_index,
                "columns" => $columns,
                "clause" => $clause
            ]
        ];
    }

    public function replaceAllLinesJSON(Request $request) {

        $statTree = StatTree::where('uid', $request->get('uid'))->first();
        if(!$statTree) return $this->fail("Stat tree does not exist!");

        $lines = json_decode($request->get('data'));

        DB::beginTransaction();

        // cleanup junk
        DB::statement("DELETE FROM stat_tree_line WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_clause WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_clause_arg WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_clause_arg_value WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);
        DB::statement("DELETE FROM stat_tree_line_report_column WHERE stat_tree_id = :stat_tree_id", ['stat_tree_id' => $statTree->id]);

        // process
        for ($i=0; $i<count($lines); $i++) {
            $result = $this->saveStatTreeLine($lines[$i], $i, null, $statTree);
            if($result !== TRUE) {
                DB::rollBack();
                return $result;
            }
        }

        DB::commit();
        return $this->pass();
    }

    private function saveStatTreeLine($line, $position, $parentLine, $statTree) {

        // saved tree line
        $nextId = DB::select("select nextval('stat_tree_line_id_seq')");
        $statTreeLine = new StatTreeLine;
        $statTreeLine->id = $nextId[0]->nextval;
        $statTreeLine->uid = Uuid::uuid4();
        $statTreeLine->stat_tree_id = $statTree->id;
        $statTreeLine->tree_order_position_index = $position;
        $statTreeLine->last_refresh_count = null;
        $statTreeLine->tsv_text_for_report_columns = null;
        $statTreeLine->parent_stat_tree_line_id = $parentLine ? $parentLine->id : null;
        $statTreeLine->save();

        // -- clauses -- START

        // copy parent line clauses
        $maxParentClausePositionIndex = 0;
        if($parentLine && count($parentLine->lineClauses)) {
            foreach ($parentLine->lineClauses as $parentLineClause) {
                $nextId = DB::select("select nextval('stat_tree_line_clause_id_seq')");
                $statTreeLineClause = new StatTreeLineClause();
                $statTreeLineClause->id = $nextId[0]->nextval;
                $statTreeLineClause->uid = Uuid::uuid4();
                $statTreeLineClause->stat_tree_line_id = $statTreeLine->id; // this stat tree line
                $statTreeLineClause->clause_id = $parentLineClause->clause_id;
                $statTreeLineClause->clause_label = $parentLineClause->clause_label;
                $statTreeLineClause->position_index = $parentLineClause->position_index;
                if($statTreeLineClause->position_index > $maxParentClausePositionIndex) {
                    $maxParentClausePositionIndex = $statTreeLineClause->position_index;
                }
                $statTreeLineClause->stat_tree_id = $statTree->id;
                $statTreeLineClause->save();

                // copy clause args for parent line clauses
                foreach ($parentLineClause->statTreeLineClauseArgs as $parentLineClauseArg) {
                    $statTreeLineClauseArg = new StatTreeLineClauseArg();
                    $nextId = DB::select("select nextval('stat_tree_line_clause_arg_id_seq')");
                    $statTreeLineClauseArg->id = $nextId[0]->nextval;
                    $statTreeLineClauseArg->stat_tree_line_clause_id = $statTreeLineClause->id; // this line cause
                    $statTreeLineClauseArg->clause_arg_id = $parentLineClauseArg->clause_arg_id;
                    $statTreeLineClauseArg->default_value = $parentLineClauseArg->default_value;
                    $statTreeLineClauseArg->access_level = $parentLineClauseArg->access_level;
                    $statTreeLineClauseArg->stat_tree_id = $statTree->id;
                    $statTreeLineClauseArg->save();
                }
            }
        }

        // create own line clause (from clause.clause_label)
        $clause = Clause::where('label', $line->clause->clause_label)->where('model', 'ilike', $statTree->model)->first();
        if(!$clause) {
            return $this->fail('No clause record found for ' . $line->clause->clause_label);
        }
        $nextId = DB::select("select nextval('stat_tree_line_clause_id_seq')");
        $statTreeLineClause = new StatTreeLineClause();
        $statTreeLineClause->id = $nextId[0]->nextval;
        $statTreeLineClause->uid = Uuid::uuid4();
        $statTreeLineClause->stat_tree_line_id = $statTreeLine->id; // this stat tree line
        $statTreeLineClause->clause_id = $clause->id;
        $statTreeLineClause->clause_label = $line->clause->clause_label;
        $statTreeLineClause->position_index = $maxParentClausePositionIndex + 1;
        $statTreeLineClause->stat_tree_id = $statTree->id;
        $statTreeLineClause->save();

        // create args for own line clause
        foreach ($clause->clauseArgs as $clauseArg) {
            $statTreeLineClauseArg = new StatTreeLineClauseArg();
            $nextId = DB::select("select nextval('stat_tree_line_clause_arg_id_seq')");
            $statTreeLineClauseArg->id = $nextId[0]->nextval;
            $statTreeLineClauseArg->stat_tree_line_clause_id = $statTreeLineClause->id;
            $statTreeLineClauseArg->clause_arg_id = $clauseArg->id;
            $statTreeLineClauseArg->default_value = null;
            $statTreeLineClauseArg->access_level = 'ADMIN';
            for ($j=0; $j<count($line->clause->args); $j++) { // find the arg matching text and type from line->args and use that
                if($line->clause->args[$j]->arg_text === $clauseArg->arg_text &&
                    $line->clause->args[$j]->field_type === $clauseArg->field_type) {
                    $statTreeLineClauseArg->default_value = $line->clause->args[$j]->default_value;
                    $statTreeLineClauseArg->access_level = $line->clause->args[$j]->access_level;
                    break;
                }
            }
            $statTreeLineClauseArg->stat_tree_id = $statTree->id;
            $statTreeLineClauseArg->save();
        }

        // -- clauses -- END


        // columns
        for ($i=0; $i<count($line->columns); $i++) {
            $column = new StatTreeLineReportColumn();
            $nextId = DB::select("select nextval('stat_tree_line_report_column_id_seq')");
            $column->id = $nextId[0]->nextval;
            $column->uid = Uuid::uuid4();
            $column->stat_tree_line_id = $statTreeLine->id;
            $column->label = $line->columns[$i]->label;
            $column->display_key = $line->columns[$i]->display_key;
            $column->position_index = $i;
            $column->stat_tree_id = $statTree->id;
            $column->save();
        }

        // child lines
        for ($i=0; $i<count($line->children); $i++) {
            $result = $this->saveStatTreeLine($line->children[$i], $i, $statTreeLine, $statTree);
            if($result !== TRUE) {
                DB::rollBack();
                return $result;
            }
        }

        return TRUE;
    }
}