import { computedFn } from 'mobx-utils';
import { createSimpleSchema, custom, map, object, primitive, PropSchema, serializable, SKIP } from 'serializr';
import { DocServer } from '../client/DocServer';
import { CompiledScript, CompileScript, ScriptOptions } from '../client/util/Scripting';
import { scriptingGlobal, ScriptingGlobals } from '../client/util/ScriptingGlobals';
import { autoObject, Deserializable } from '../client/util/SerializationHelper';
import { numberRange } from '../Utils';
import { Doc, Field, Opt } from './Doc';
import { Copy, Id, ToScriptString, ToString } from './FieldSymbols';
import { List } from './List';
import { ObjectField } from './ObjectField';
import { Cast, StrCast } from './Types';
import { Plugins } from './util';

function optional(propSchema: PropSchema) {
    return custom(
        value => {
            if (value !== undefined) {
                return propSchema.serializer(value);
            }
            return SKIP;
        },
        (jsonValue: any, context: any, oldValue: any, callback: (err: any, result: any) => void) => {
            if (jsonValue !== undefined) {
                return propSchema.deserializer(jsonValue, callback, context, oldValue);
            }
            return SKIP;
        }
    );
}

const optionsSchema = createSimpleSchema({
    requiredType: true,
    addReturn: true,
    typecheck: true,
    editable: true,
    readonly: true,
    params: optional(map(primitive())),
});

const scriptSchema = createSimpleSchema({
    options: object(optionsSchema),
    originalScript: true,
});

function finalizeScript(script: ScriptField) {
    const comp = CompileScript(script.script.originalScript, script.script.options);
    if (!comp.compiled) {
        throw new Error("Couldn't compile loaded script");
    }
    if (script.setterscript) {
        const compset = CompileScript(script.setterscript?.originalScript, script.setterscript.options);
        if (!compset.compiled) {
            throw new Error("Couldn't compile setter script");
        }
        (script as any).setterscript = compset;
    }
    return comp;
}
async function deserializeScript(script: ScriptField) {
    if (script.captures) {
        const captured: any = {};
        (script.script.options as ScriptOptions).capturedVariables = captured;
        Promise.all(
            script.captures.map(async capture => {
                const key = capture.split(':')[0];
                const val = capture.split(':')[1];
                if (val === 'true') captured[key] = true;
                else if (val === 'false') captured[key] = false;
                else if (val.startsWith('ID->')) captured[key] = await DocServer.GetRefField(val.replace('ID->', ''));
                else if (!isNaN(Number(val))) captured[key] = Number(val);
                else captured[key] = val;
            })
        ).then(() => ((script as any).script = finalizeScript(script)));
    } else {
        (script as any).script = ScriptField.GetScriptFieldCache(script.script.originalScript) ?? finalizeScript(script);
    }
}

@scriptingGlobal
@Deserializable('script', deserializeScript)
export class ScriptField extends ObjectField {
    @serializable
    readonly rawscript: string | undefined;
    @serializable(object(scriptSchema))
    readonly script: CompiledScript;
    @serializable(object(scriptSchema))
    readonly setterscript: CompiledScript | undefined;

    @serializable(autoObject())
    captures?: List<string>;

    public static _scriptFieldCache: Map<string, Opt<CompiledScript>> = new Map();
    public static GetScriptFieldCache(field: string) {
        return this._scriptFieldCache.get(field);
    }

    constructor(script: CompiledScript | undefined, setterscript?: CompiledScript, rawscript?: string) {
        super();

        const captured = script?.options.capturedVariables;
        if (captured) {
            this.captures = new List<string>(Object.keys(captured).map(key => key + ':' + (captured[key] instanceof Doc ? 'ID->' + (captured[key] as Doc)[Id] : captured[key].toString())));
        }
        this.rawscript = rawscript;
        this.setterscript = setterscript;
        this.script = script ?? (CompileScript('false') as CompiledScript);
    }

    //     init(callback: (res: Field) => any) {
    //         const options = this.options!;
    //         const keys = Object.keys(options.options.capturedIds);
    //         Server.GetFields(keys).then(fields => {
    //             let captured: { [name: string]: Field } = {};
    //             keys.forEach(key => captured[options.options.capturedIds[key]] = fields[key]);
    //             const opts: ScriptOptions = {
    //                 addReturn: options.options.addReturn,
    //                 params: options.options.params,
    //                 requiredType: options.options.requiredType,
    //                 capturedVariables: captured
    //             };
    //             const script = CompileScript(options.script, opts);
    //             if (!script.compiled) {
    //                 throw new Error("Can't compile script");
    //             }
    //             this._script = script;
    //             callback(this);
    //         });
    //     }

    [Copy](): ObjectField {
        return new ScriptField(this.script, this.setterscript, this.rawscript);
    }
    toString() {
        return `${this.script.originalScript} + ${this.setterscript?.originalScript}`;
    }

    [ToScriptString]() {
        return 'script field';
    }
    [ToString]() {
        return this.script.originalScript;
    }
    public static CompileScript(script: string, params: object = {}, addReturn = false, capturedVariables?: { [name: string]: Doc | string | number | boolean }) {
        return CompileScript(script, {
            params: {
                this: Doc?.name || 'Doc', // this is the doc that executes the script
                self: Doc?.name || 'Doc', // self is the root doc of the doc that executes the script
                _last_: 'any', // _last_ is the previous value of a computed field when it is being triggered to re-run.
                _readOnly_: 'boolean', // _readOnly_ is set when a computed field is executed to indicate that it should not have mobx side-effects.  used for checking the value of a set function (see FontIconBox)
                ...params,
            },
            typecheck: false,
            editable: true,
            addReturn: addReturn,
            capturedVariables,
        });
    }
    public static MakeFunction(script: string, params: object = {}, capturedVariables?: { [name: string]: Doc | string | number | boolean }) {
        const compiled = ScriptField.CompileScript(script, params, true, capturedVariables);
        return compiled.compiled ? new ScriptField(compiled) : undefined;
    }

    public static MakeScript(script: string, params: object = {}, capturedVariables?: { [name: string]: Doc | string | number | boolean }) {
        const compiled = ScriptField.CompileScript(script, params, false, capturedVariables);
        return compiled.compiled ? new ScriptField(compiled) : undefined;
    }
}

@scriptingGlobal
@Deserializable('computed', deserializeScript)
export class ComputedField extends ScriptField {
    _lastComputedResult: any;
    //TODO maybe add an observable cache based on what is passed in for doc, considering there shouldn't really be that many possible values for doc
    value = computedFn((doc: Doc) => this._valueOutsideReaction(doc));
    _valueOutsideReaction = (doc: Doc) => (this._lastComputedResult = this.script.run({ this: doc, self: Cast(doc.rootDocument, Doc, null) || doc, _last_: this._lastComputedResult, _readOnly_: true }, console.log).result);

    [Copy](): ObjectField {
        return new ComputedField(this.script, this.setterscript, this.rawscript);
    }

    public static MakeScript(script: string, params: object = {}) {
        const compiled = ScriptField.CompileScript(script, params, false);
        return compiled.compiled ? new ComputedField(compiled) : undefined;
    }
    public static MakeFunction(script: string, params: object = {}, capturedVariables?: { [name: string]: Doc | string | number | boolean }) {
        const compiled = ScriptField.CompileScript(script, params, true, capturedVariables);
        return compiled.compiled ? new ComputedField(compiled) : undefined;
    }
    public static MakeInterpolatedNumber(fieldKey: string, interpolatorKey: string, doc: Doc, curTimecode: number, defaultVal: Opt<number>) {
        if (!doc[`${fieldKey}-indexed`]) {
            const flist = new List<number>(numberRange(curTimecode + 1).map(i => undefined) as any as number[]);
            flist[curTimecode] = Cast(doc[fieldKey], 'number', null);
            doc[`${fieldKey}-indexed`] = flist;
        }
        const getField = ScriptField.CompileScript(`getIndexVal(self['${fieldKey}-indexed'], self.${interpolatorKey}, ${defaultVal})`, {}, true, {});
        const setField = ScriptField.CompileScript(`setIndexVal(self['${fieldKey}-indexed'], self.${interpolatorKey}, value)`, { value: 'any' }, true, {});
        return getField.compiled ? new ComputedField(getField, setField?.compiled ? setField : undefined) : undefined;
    }
    public static MakeInterpolatedString(fieldKey: string, interpolatorKey: string, doc: Doc, curTimecode: number) {
        if (!doc[`${fieldKey}-indexed`]) {
            const flist = new List<string>(numberRange(curTimecode + 1).map(i => undefined) as any as string[]);
            flist[curTimecode] = StrCast(doc[fieldKey]);
            doc[`${fieldKey}-indexed`] = flist;
        }
        const getField = ScriptField.CompileScript(`getIndexVal(self['${fieldKey}-indexed'], self.${interpolatorKey})`, {}, true, {});
        const setField = ScriptField.CompileScript(`setIndexVal(self['${fieldKey}-indexed'], self.${interpolatorKey}, value)`, { value: 'any' }, true, {});
        return getField.compiled ? new ComputedField(getField, setField?.compiled ? setField : undefined) : undefined;
    }
    public static MakeInterpolatedDataField(fieldKey: string, interpolatorKey: string, doc: Doc, curTimecode: number) {
        if (!doc[`${fieldKey}-indexed`]) {
            const flist = new List<Field>(numberRange(curTimecode + 1).map(i => undefined) as any as Field[]);
            flist[curTimecode] = Field.Copy(doc[fieldKey]);
            doc[`${fieldKey}-indexed`] = flist;
        }
        const getField = ScriptField.CompileScript(`getIndexVal(self['${fieldKey}-indexed'], self.${interpolatorKey})`, {}, true, {});
        const setField = ScriptField.CompileScript(`setIndexVal(self['${fieldKey}-indexed'], self.${interpolatorKey}, value)`, { value: 'any' }, true, {});
        return getField.compiled ? new ComputedField(getField, setField?.compiled ? setField : undefined) : undefined;
    }
}
export namespace ComputedField {
    let useComputed = true;
    export function DisableComputedFields() {
        useComputed = false;
    }

    export function EnableComputedFields() {
        useComputed = true;
    }

    export const undefined = '__undefined';

    export function WithoutComputed<T>(fn: () => T) {
        DisableComputedFields();
        try {
            return fn();
        } finally {
            EnableComputedFields();
        }
    }

    export function initPlugin() {
        Plugins.addGetterPlugin((doc, _, value) => {
            if (useComputed && value instanceof ComputedField) {
                return { value: value._valueOutsideReaction(doc), shouldReturn: true };
            }
        });
    }
}

ScriptingGlobals.add(
    function setIndexVal(list: any[], index: number, value: any) {
        while (list.length <= index) list.push(undefined);
        list[index] = value;
    },
    'sets the value at a given index of a list',
    '(list: any[], index: number, value: any)'
);

ScriptingGlobals.add(
    function getIndexVal(list: any[], index: number, defaultVal: Opt<number> = undefined) {
        return list?.reduce((p, x, i) => ((i <= index && x !== undefined) || p === undefined ? x : p), defaultVal);
    },
    'returns the value at a given index of a list',
    '(list: any[], index: number)'
);

ScriptingGlobals.add(
    function makeScript(script: string) {
        return ScriptField.MakeScript(script);
    },
    'returns the value at a given index of a list',
    '(list: any[], index: number)'
);