{% load i18n static %}

<style>
    [v-cloak] {
      display: none;
    }
</style>

<div class="better-json" id="better-json-{{ field_name }}" v-cloak>
    <div v-show="currentSchema.length">
        <h2>[[ label ]]</h2>

        <div v-if="help && help != ''" class="form-row">
            <p class="help">[[ help ]]</p>
        </div>

        <div class="better-json-rows">
            <div v-if="errors" class="form-row field-data">
                <div>
                    <ul class="errorlist" v-html="errors"></ul>
                </div>
            </div>

            <div class="form-row field-data" v-for="item in currentSchema" v-if="!isRawEditOn">
                <div v-if="item.enum.length">
                    <label :class="{required: item.required}"
                           :for="`id_custom_json_${item.name}`"
                    >
                        [[ item.title ]]:
                    </label>
                    <select :name="item.name"
                            :id="`id_custom_json_${item.name}`"
                            v-model="bindValues[item.name]"
                    >
                        <option :value="opt" v-for="opt in item.enum">[[ opt ]]</option>
                    </select>
                </div>

                <div v-else-if="item.type === 'string'">
                    <label :class="{required: item.required}"
                           :for="`id_custom_json_${item.name}`"
                    >
                        [[ item.title ]]:
                    </label>
                    <input type="text"
                           :name="item.name"
                           class="vTextField"
                           :required="item.required ? true : null"
                           :id="`id_custom_json_${item.name}`"
                           v-model="bindValues[item.name]"
                    >
                </div>

                <div v-else-if="item.type === 'integer' || item.type === 'number'">
                    <label :for="`id_custom_json_${item.name}`"
                           :class="{required: item.required}"
                    >[[ item.title ]]:</label>
                    <input type="number"
                           :name="item.name"
                           :required="item.required ? true : null"
                           v-model="bindValues[item.name]"
                           :id="`id_custom_json_${item.name}`"
                    >
                </div>

                <div v-else-if="item.type === 'boolean'">
                    <input type="checkbox"
                           :name="item.name"
                           :id="`id_custom_json_${item.name}`"
                           v-model="bindValues[item.name]"
                    >
                    <label class="vCheckboxLabel"
                           :for="`id_custom_json_${item.name}`"
                    >
                        [[ item.title ]]
                    </label>
                </div>

                <div class="help" v-if="item.description">[[ item.description ]]</div>
            </div>
        </div>
        <div class="form-row field-data better-json-textarea" v-show="isRawEditOn">
            <div>
                <label :for="id" class="required">{% trans "Raw JSON Editing" %}:</label>
                <textarea class="vLargeTextField"
                          cols="40"
                          :id="id"
                          :name="name"
                          rows="10"
                          v-model="rawValue"
                ></textarea>
            </div>
                <a href="#"
                   class="better-json-restore-original"
                   title="{% trans 'restore original' %}"
                   @click.stop.prevent="rawValue = originalValue"
                >
                    <img src="{% static 'admin/img/icon-yes.svg' %}" alt="">
                    {% trans "Restore original value" %}
                </a>
        </div>

        <div class="form-row">
            <a href="#"
               class="better-json-toggle-textarea"
               title="{% trans 'toggle textarea' %}"
               style="float:right"
               @click.stop.prevent="toggleRawEditing"
            >
                <img src="{% static 'admin/img/icon-changelink.svg' %}" alt="">
                {% trans "Toggle Raw JSON Editing" %}
            </a>
        </div>
    </div>
</div>

<script type="module">
    const { createApp } = Vue;

    const $ = django.jQuery;

    let fieldName = "{{ field_name }}";
    let fieldId = `id_${fieldName}`;
    let originalTextarea = $("#" + fieldId);
    let originalValue = originalTextarea.val();
    let originalContainer = originalTextarea.parents(".form-row").eq(0);
    let errorHtml = originalContainer.find(".errorlist").html();

    originalContainer.after($("#better-json-{{ field_name }}").detach());

    originalTextarea.remove();
    originalContainer.hide();

    $(function () {
        let followField = "{{ follow_field }}";
        let needFollow = followField !== "";
        let followInput = needFollow ? document.getElementById(`id_${followField}`) : null;
        createApp({
            data() {
                return {
                    needFollow: needFollow,
                    followInput: followInput,
                    schemaMapping: {{ schema_mapping | safe }},
                    followInputValue: needFollow ? followInput.value : "",
                    originalValue: originalValue,
                    rawValue: originalValue,
                    isRawEditOn: Boolean(errorHtml),

                    id: fieldId,
                    name: fieldName,
                    label: originalContainer.find("label").text(),

                    help: originalContainer.find(".help").text(),
                    errors: errorHtml,
                    values: null,
                }
            },
            methods: {
                onChange(event) {
                    let value = "";
                    if (event.target.type === "checkbox") {
                        value = event.target.checked;
                    } else {
                        value = event.target.value;
                    }
                    this.followInputValue = String(value);
                },
                parseSchemas() {
                    // TODO add not existed fields from data
                    let results = {};
                    const fillerValues = {
                        "string": "",
                        "number": 0,
                        "integer": 0,
                        "boolean": false,
                    }
                    let JSONData = {};
                    if (this.checkRawValueIsValidAndAlert(true)) {
                        JSONData = JSON.parse(this.rawValue);
                    }

                    if (!this.schemaMapping) {
                        return results;
                    }

                    for (const [schemaName, schema] of Object.entries(this.schemaMapping)) {
                        results[schemaName] = [];

                        if (!schema.properties) {
                            continue;
                        }

                        for (const [fieldName, field] of Object.entries(schema.properties)) {
                            let defaultValue = field.default ?? fillerValues[field.type];
                            if (fieldName in JSONData) {
                                defaultValue = JSONData[fieldName];
                            }
                            results[schemaName].push({
                                name: fieldName,
                                title: field.title ?? fieldName,
                                type: field.type,
                                description: field.description ?? "",
                                default: defaultValue,
                                required: schema.required.includes(fieldName),
                                enum: field.enum ?? [],
                            });
                        }
                    }
                    return results;
                },
                fromRawToWidget() {
                    this.values = {};
                    let schemas = this.parseSchemas();
                    if (schemas === null) {
                        return null;
                    }
                    for (const [schemaName, schema] of Object.entries(schemas)) {
                        this.values[schemaName] = {};
                        for (const field of schema) {
                            this.values[schemaName][field.name] = field.default;
                        }
                    }
                },
                toggleRawEditing() {
                    if (!this.checkRawValueIsValidAndAlert()) {
                        return;
                    }
                    this.fromRawToWidget();
                    this.isRawEditOn = !this.isRawEditOn;
                },
                checkRawValueIsValidAndAlert(quiet) {
                    if (this.rawValue !== "" && this.rawValue !== "{}") {
                        try {
                            JSON.parse(this.rawValue);
                        } catch (e) {
                            if (!quiet) {
                                alert("invalid JSON:\n" + e);
                            }
                            return false;
                        }
                    }
                    return true;
                }
            },
              watch: {
                bindValues: {
                    handler(value, oldValue) {
                        if (this.currentSchema.length) {
                            this.rawValue = JSON.stringify(value, null, 4);
                        } else {
                            this.rawValue = "{}";
                        }
                    },
                    deep: true,
                }
            },
            computed: {
                currentSchema() {
                    let schemas = this.parseSchemas();

                    if (!(this.followInputValue in schemas)) {
                        return [];
                    }
                    return schemas[this.followInputValue];
                },
                bindValues() {
                    if (this.values == null) {
                        this.fromRawToWidget();
                    }
                    return this.values[this.followInputValue];
                }
            },
            mounted() {
                this.fromRawToWidget();
                if (this.needFollow) {
                    this.followInput.addEventListener("input", this.onChange);
                }
            },
            destroyed() {
                this.followInput.removeEventListener("input", this.onChange);
            },
            compilerOptions: {
                delimiters: ["[[", "]]"]
            }
        }).mount("#better-json-{{ field_name }}");
    });

</script>