import { proxy } from 'valtio';
import { deepEqual } from '../utils/object';
import transactionsData from "../content/transactions.json";
import state from '.';
import { showAlert } from "../state/actions/showAlert";
import { parseJSON } from '../utils/json';

export type SelectOption = {
    value: string;
    label: string;
};

export interface TransactionState {
    selectedTransaction: SelectOption | null;
    selectedAccount: SelectOption | null;
    selectedDestAccount: SelectOption | null;
    txIsLoading: boolean;
    txIsDisabled: boolean;
    txFields: TxFields;
    viewType: 'json' | 'ui',
    editorValue?: string,
    estimatedFee?: string
}


export type TxFields = Omit<
    Partial<typeof transactionsData[0]>,
    "Account" | "Sequence" | "TransactionType"
>;

export const defaultTransaction: TransactionState = {
    selectedTransaction: null,
    selectedAccount: null,
    selectedDestAccount: null,
    txIsLoading: false,
    txIsDisabled: false,
    txFields: {},
    viewType: 'ui'
};

export const transactionsState = proxy({
    transactions: [
        {
            header: "test1.json",
            state: { ...defaultTransaction },
        },
    ],
    activeHeader: "test1.json"
});

export const renameTxState = (oldName: string, nwName: string) => {
    const tx = transactionsState.transactions.find(tx => tx.header === oldName);

    if (!tx) throw Error(`No transaction state exists with given header name ${oldName}`);

    tx.header = nwName
}

/**
 * Simple transaction state changer
 * @param header Unique key and tab name for the transaction tab
 * @param partialTx partial transaction state, `undefined` deletes the transaction
 * 
 */
export const modifyTxState = (
    header: string,
    partialTx?: Partial<TransactionState>,
    opts: { replaceState?: boolean } = {}
) => {
    const tx = transactionsState.transactions.find(tx => tx.header === header);

    if (partialTx === undefined) {
        transactionsState.transactions = transactionsState.transactions.filter(
            tx => tx.header !== header
        );
        return;
    }

    if (!tx) {
        const state = {
            ...defaultTransaction,
            ...partialTx,
        }
        transactionsState.transactions.push({
            header,
            state,
        });
        return state;
    }

    if (opts.replaceState) {
        const repTx: TransactionState = {
            ...defaultTransaction,
            ...partialTx,
        }
        tx.state = repTx
        return repTx
    }

    Object.keys(partialTx).forEach(k => {
        // Typescript mess here, but is definitely safe!
        const s = tx.state as any;
        const p = partialTx as any; // ? Make copy
        if (!deepEqual(s[k], p[k])) s[k] = p[k];
    });

    return tx.state
};

// state to tx options
export const prepareTransaction = (data: any) => {
    let options = { ...data };

    (Object.keys(options)).forEach(field => {
        let _value = options[field];
        // convert xrp
        if (_value && typeof _value === "object" && _value.$type === "xrp") {
            if (+_value.$value) {
                options[field] = (+_value.$value * 1000000 + "") as any;
            } else {
                options[field] = undefined; // 👇 💀
            }
        }
        // handle type: `json`
        if (_value && typeof _value === "object" && _value.$type === "json") {
            if (typeof _value.$value === "object") {
                options[field] = _value.$value;
            } else {
                try {
                    options[field] = JSON.parse(_value.$value);
                } catch (error) {
                    const message = `Input error for json field '${field}': ${error instanceof Error ? error.message : ""
                        }`;
                    console.error(message)
                    options[field] = _value.$value
                }
            }
        }

        // delete unnecessary fields
        if (!options[field]) {
            delete options[field];
        }
    });

    return options
}

// editor value to state
export const prepareState = (value: string, transactionType?: string) => {
    const options = parseJSON(value);
    if (!options) {
        showAlert("Error!", {
            body: "Cannot save editor with malformed transaction."
        })
        return
    };

    const { Account, TransactionType, Destination, ...rest } = options;
    let tx: Partial<TransactionState> = {};
    const schema = getTxFields(transactionType)

    if (Account) {
        const acc = state.accounts.find(acc => acc.address === Account);
        if (acc) {
            tx.selectedAccount = {
                label: acc.name,
                value: acc.address,
            };
        } else {
            tx.selectedAccount = {
                label: Account,
                value: Account,
            };
        }
    } else {
        tx.selectedAccount = null;
    }

    if (TransactionType) {
        tx.selectedTransaction = {
            label: TransactionType,
            value: TransactionType,
        };
    } else {
        tx.selectedTransaction = null;
    }

    if (schema.Destination !== undefined) {
        const dest = state.accounts.find(acc => acc.address === Destination);
        if (dest) {
            tx.selectedDestAccount = {
                label: dest.name,
                value: dest.address,
            };
        }
        else if (Destination) {
            tx.selectedDestAccount = {
                label: Destination,
                value: Destination,
            };
        }
        else {
            tx.selectedDestAccount = null
        }
    }
    else if (Destination) {
        rest.Destination = Destination
    }

    Object.keys(rest).forEach(field => {
        const value = rest[field];
        const schemaVal = schema[field as keyof TxFields]
        const isXrp = typeof value !== 'object' && schemaVal && typeof schemaVal === 'object' && schemaVal.$type === 'xrp'
        if (isXrp) {
            rest[field] = {
                $type: "xrp",
                $value: +value / 1000000, // ! maybe use bigint?
            };
        } else if (typeof value === "object") {
            rest[field] = {
                $type: "json",
                $value: value,
            };
        }
    });

    tx.txFields = rest;

    return tx
}

export const getTxFields = (tt?: string) => {
    const txFields: TxFields | undefined = transactionsData.find(
        tx => tx.TransactionType === tt
    );

    if (!txFields) return {}

    let _txFields = Object.keys(txFields)
        .filter(
            key => !["TransactionType", "Account", "Sequence"].includes(key)
        )
        .reduce<TxFields>(
            (tf, key) => (
                (tf[key as keyof TxFields] = (txFields as any)[key]), tf
            ),
            {}
        );
    return _txFields
}

export { transactionsData }

export const transactionsOptions = transactionsData.map(tx => ({
    value: tx.TransactionType,
    label: tx.TransactionType,
}));

export const defaultTransactionType = transactionsOptions.find(tt => tt.value === 'Payment')