import { dom, el } from './dom.js';
import { jsonQuery, jsonPatch } from './json.js';

/**
 * This form encapsulates a form with a model and a layout.
 * 
 */
class JsonForm {

    #dom = null;
    #model = null;
    #layout = null;
    #editable = false;

    set model(model) {
        this.#model = model;
        this.#layout.modelUpdated(model);
    }
    get model() {
        return this.#model;
    }

    set editable(state) {
        this.#editable = !!state;
        this.#layout.setEditable(this.#editable);
        if (this.#editable === false) {
            this.refreshModel();
        }
    }
    get editable() {
        return this.#editable;
    }

    get layout() {
        return this.#layout;
    }

    constructor() {
        this.#layout = new FormLayout();
    }

    dom() {
        if (!this.#dom) {
            this.#dom = el.div({ class: 'jsl-form' });
        }
        this.#layout.buildDom(this.#dom);
        return this.#dom;
    }

    refreshModel() {
        // TODO go over the fields and update the model with any modified data
        this.#model = this.#layout.updateModel(this.#model);
    }

}

class FormLayout {

    #rows = [];

    addRow() {
        const row = new FormRow();
        this.#rows.push(row);
        return row;
    }

    buildDom(element) {
        element.innerHTML = '';
        this.#rows.forEach(row => {
            const rowEl = row.dom();

            element.appendChild(rowEl);
        })
    }

    modelUpdated(model) {
        this.#rows.forEach(row => row.modelUpdated(model));
    }

    updateModel(model) {
        this.#rows.forEach(row => model = row.updateModel(model));
        return model;
    }

    setEditable(state) {
        this.#rows.forEach(row => row.setEditable(state));
    }

}

class FormRow {
    el = null;
    #fields = [];

    append(field) {
        this.#fields.push(field);
        return this;
    }

    dom() {
        if (!this.el) {
            this.el = el.div({ class: '-row' });        
        }
        this.el.innerHTML = '';
        this.#fields.forEach(field => {
            this.el.appendChild(field.dom());
        })
        return this.el;
    }

    modelUpdated(model) {
        this.#fields.forEach(field => {
            if (!field.options.path) return;
            field.value = jsonQuery(model, field.options.path);
        });
    }

    updateModel(model) {
        this.#fields.forEach(field => {
            if (!field.options.path) return;
            field.value = field.getValue();
            model = jsonPatch(model, field.options.path, field.value);
        });
        return model;
    }

    setEditable(state) {
        this.#fields.forEach(field => {
            if (field.options.locked === true) return;
            field.setEditable(state)
        });
    }

}

class FormField {
    #el = null;
    #label = null;
    #options = {};
    #value = null;

    get value() {
        return this.#value;
    }
    set value(val) {
        this.#value = val;
        this.valueUpdated();
    }

    get el() {
        return this.#el;
    }

    get options() {
        return this.#options;
    }

    constructor(options = {}) {
        this.#options = options || {};
    }

    dom() {
        if (!this.#el) {
            let style = null;
            if (this.#options.width) {
                style = 'width: ' + this.#options.width + '%;';
            } else {
                style = 'flex-grow: 1;';
            }
            this.#el = el.div({ class: '-form-field', style: style ?? null });

            this.#label = el.label({ class: '-label' });
            this.#label.innerHTML = this.options.label ?? "Unlabeled";
            this.#el.appendChild(this.#label);
        }
        this.buildField();
        return this.#el;
    }

    /**
     * Update the value without triggering any effects
     * 
     * @param {*} value The new value
     */
    updateValue(value) {
        this.#value = value;
    }

    buildField() {
    }

    valueUpdated() {
    }

    setEditable(state) {
    }
}

class TextField extends FormField {
    #input = null;
    buildField() {
        if (!this.#input) {
            this.#input = el.div({ class: '-field -text-field' })
            this.el.appendChild(this.#input);
        }
        this.#input.innerText = this.value;
    }
    valueUpdated() {
        if (!this.#input) return;
        this.#input.innerText = this.value;        
    }
    getValue() {
        if (this.#input.innerText === '') {
            if (this.options.nullable !== false)
                return null;
        }
        return this.#input.innerText;
    }
    setEditable(state) {
        if (state) {
            dom.apply(this.#input, { 'contenteditable':'plaintext-only' });
        } else {
            this.updateValue(this.#input.innerText);
            dom.apply(this.#input, { 'contenteditable':null });
        }
    }
}

class NumericField extends FormField {
    #input = null;
    buildField() {
        if (!this.#input) {
            this.#input = el.div({ class: '-field -number-field' })
            this.el.appendChild(this.#input);
        }
        this.#input.innerText = this.value;
    }
    valueUpdated() {
        if (!this.#input) return;
        this.#input.innerText = this.value;
    }
    getValue() {
        if (this.#input.innerText === '') {
            if (this.options.nullable !== false)
                return null;
        }
        if (this.options.fixed && typeof this.options.fixed == 'number') {
            return parseFloat(this.#input.innerText).toFixed(this.options.fixed);
        }
        if (this.options.float) {
            return parseFloat(this.#input.innerText);
        }
        return parseInt(this.#input.innerText);
    }
    setEditable(state) {
        if (state) {
            dom.apply(this.#input, { 'contenteditable':'plaintext-only' });
        } else {
            this.updateValue(this.#input.innerText);
            dom.apply(this.#input, { 'contenteditable':null });
        }
    }
}

class DateField extends FormField {
    #input = null;
    buildField() {
        if (!this.#input) {
            this.#input = el.div({ class: '-field -date-field' })
            this.el.appendChild(this.#input);
        }
        this.#input.innerHTML = "I'm a date!";
    }
}

class SelectField extends FormField {

}

class CheckField extends FormField {

}

export {
    JsonForm,
    FormLayout,
    FormRow,
    FormField,
    TextField,
    NumericField,
    DateField,
    SelectField,
    CheckField,
}