import { openDB } from "idb";
import React, { useEffect, useRef, useState } from "react";
import Button from "../common/Button";
import Footer from "../common/Footer";
import Header from "../common/Header";
import "../index.css";
import { generateFile } from "./csv";
import { defaultData, defaultPlant, defaultProduct } from "./defaults";
import { exportData, importData } from "./export";
import ParametersBlock from "./ParametersBlock";
import PipelineBlock, { randomPosition } from "./PipelineBlock";
import PlantBlock from "./PlantBlock";
import ProductBlock from "./ProductBlock";
import { validate } from "./validate";
import { useHistory } from "react-router-dom";
import { SERVER_URL } from "..";

const setDefaults = (actualDict, defaultDict) => {
  for (const [key, defaultValue] of Object.entries(defaultDict)) {
    if (!(key in actualDict)) {
      if (typeof defaultValue === "object") {
        actualDict[key] = { ...defaultValue };
      } else {
        actualDict[key] = defaultValue;
      }
    }
  }
};

const cleanDict = (dict, defaultDict) => {
  for (const key of Object.keys(dict)) {
    if (!(key in defaultDict)) {
      delete dict[key];
    }
  }
};

const fixLists = (dict, blacklist, stringify) => {
  for (const [key, val] of Object.entries(dict)) {
    if (blacklist.includes(key)) continue;
    if (Array.isArray(val)) {
      // Replace constant lists by a single number
      let isConstant = true;
      for (let i = 1; i < val.length; i++) {
        if (val[i - 1] !== val[i]) {
          isConstant = false;
          break;
        }
      }
      if (isConstant) dict[key] = val[0];

      // Convert lists to JSON strings
      if (stringify) dict[key] = JSON.stringify(dict[key]);
    }
    if (typeof val === "object") {
      fixLists(val, blacklist, stringify);
    }
  }
};

const openRelogDB = async () => {
  const dbPromise = await openDB("RELOG", 1, {
    upgrade(db) {
      db.createObjectStore("casebuilder");
    },
  });
  return dbPromise;
};

const InputPage = () => {
  const fileElem = useRef();
  let [data, setData] = useState(defaultData);
  let [messages, setMessages] = useState([]);
  let [processing, setProcessing] = useState(false);

  const save = async (data) => {
    const db = await openRelogDB();
    await db.put("casebuilder", data, "data");
  };

  useEffect(async () => {
    const db = await openRelogDB();
    const data = await db.get("casebuilder", "data");
    if (data) setData(data);
  }, []);

  const history = useHistory();

  const promptName = (prevData) => {
    const name = prompt("Name");
    if (!name || name.length === 0) return;
    if (name in prevData.products || name in prevData.plants) return;
    return name;
  };

  const onAddPlant = () => {
    setData((prevData) => {
      const name = promptName(prevData);
      if (name === undefined) return prevData;
      const newData = { ...prevData };
      const [x, y] = randomPosition();
      newData.plants[name] = {
        ...defaultPlant,
        x: x,
        y: y,
      };
      save(newData);
      return newData;
    });
  };

  const onAddProduct = () => {
    setData((prevData) => {
      const name = promptName(prevData);
      if (name === undefined) return prevData;
      const newData = { ...prevData };
      const [x, y] = randomPosition();
      console.log(x, y);
      newData.products[name] = {
        ...defaultProduct,
        x: x,
        y: y,
      };
      save(newData);
      return newData;
    });
  };

  const onRenamePlant = (prevName, newName) => {
    setData((prevData) => {
      const newData = { ...prevData };
      newData.plants[newName] = newData.plants[prevName];
      delete newData.plants[prevName];
      save(newData);
      return newData;
    });
  };

  const onRenameProduct = (prevName, newName) => {
    setData((prevData) => {
      const newData = { ...prevData };
      newData.products[newName] = newData.products[prevName];
      delete newData.products[prevName];
      for (const [, plant] of Object.entries(newData.plants)) {
        if (plant.input === prevName) {
          plant.input = newName;
        }
        let outputFound = false;
        for (const [outputName] of Object.entries(
          plant["outputs (tonne/tonne)"]
        )) {
          if (outputName === prevName) outputFound = true;
        }
        if (outputFound) {
          plant["outputs (tonne/tonne)"][newName] =
            plant["outputs (tonne/tonne)"][prevName];
          delete plant["outputs (tonne/tonne)"][prevName];
        }
      }
      save(newData);
      return newData;
    });
  };

  const onMovePlant = (plantName, x, y) => {
    setData((prevData) => {
      const newData = { ...prevData };
      newData.plants[plantName].x = x;
      newData.plants[plantName].y = y;
      save(newData);
      return newData;
    });
  };

  const onMoveProduct = (productName, x, y) => {
    setData((prevData) => {
      const newData = { ...prevData };
      newData.products[productName].x = x;
      newData.products[productName].y = y;
      save(newData);
      return newData;
    });
  };

  const onRemovePlant = (plantName) => {
    setData((prevData) => {
      const newData = { ...prevData };
      delete newData.plants[plantName];
      save(newData);
      return newData;
    });
  };

  const onRemoveProduct = (productName) => {
    setData((prevData) => {
      const newData = { ...prevData };
      delete newData.products[productName];
      for (const [, plant] of Object.entries(newData.plants)) {
        if (plant.input === productName) {
          delete plant.input;
        }
        let outputFound = false;
        for (const [outputName] of Object.entries(
          plant["outputs (tonne/tonne)"]
        )) {
          if (outputName === productName) outputFound = true;
        }
        if (outputFound) {
          delete plant["outputs (tonne/tonne)"][productName];
        }
      }
      save(newData);
      return newData;
    });
  };

  const onSetPlantInput = (plantName, productName) => {
    setData((prevData) => {
      const newData = { ...prevData };
      newData.plants[plantName].input = productName;
      save(newData);
      return newData;
    });
  };

  const onAddPlantOutput = (plantName, productName) => {
    setData((prevData) => {
      if (productName in prevData.plants[plantName]["outputs (tonne/tonne)"]) {
        return prevData;
      }
      const newData = { ...prevData };
      [
        "outputs (tonne/tonne)",
        "disposal cost ($/tonne)",
        "disposal limit (tonne)",
      ].forEach((key) => {
        newData.plants[plantName][key] = { ...newData.plants[plantName][key] };
        newData.plants[plantName][key][productName] = 0;
      });
      save(newData);
      return newData;
    });
  };

  const onSave = () => {
    const exported = exportData(data);
    const valid = validate(exported);
    console.log(exported);
    console.log(validate.errors);
    if (valid) {
      generateFile("case.json", JSON.stringify(exported, null, 2));
    } else {
      setMessages([
        ...messages,
        "Data has validation errors and could not be saved.",
      ]);
    }
  };

  const onClear = () => {
    const newData = JSON.parse(JSON.stringify(defaultData));
    setData(newData);
    save(newData);
  };

  const onLoad = (contents) => {
    const parsed = JSON.parse(contents);
    const valid = validate(parsed);
    if (valid) {
      const newData = importData(parsed);
      setData(newData);
      save(newData);
    } else {
      console.log(validate.errors);
      setMessages([...messages, "File is corrupted and could not be loaded."]);
    }
  };

  const onDismissMessage = (idx) => {
    setMessages([...messages.slice(0, idx), ...messages.slice(idx + 1)]);
  };

  const onChange = (val, field1, field2) => {
    setData((prevData) => {
      const newData = { ...prevData };
      if (field2 !== undefined) {
        newData[field1][field2] = val;
      } else {
        newData[field1] = val;
      }
      save(newData);
      return newData;
    });
  };
  let productComps = [];
  for (const [prodName, prod] of Object.entries(data.products)) {
    productComps.push(
      <ProductBlock
        key={prodName}
        name={prodName}
        value={prod}
        onChange={(v) => onChange(v, "products", prodName, v)}
      />
    );
  }

  const onSubmit = async () => {
    const exported = exportData(data);
    const valid = validate(exported);
    if (valid) {
      setProcessing(true);
      try {
        const response = await fetch(`${SERVER_URL}/submit`, {
          method: "POST",
          body: JSON.stringify(exported),
        });
        if (response.ok) {
          const data = await response.json();
          history.push(`solver/${data.job_id}`);
        } else {
          throw "Error";
        }
      } catch {
        setMessages([
          ...messages,
          "Failed to submit job. Please try again later.",
        ]);
      } finally {
        setProcessing(false);
      }
    }
  };

  let plantComps = [];
  for (const [plantName, plant] of Object.entries(data.plants)) {
    plantComps.push(
      <PlantBlock
        key={plantName}
        name={plantName}
        value={plant}
        onChange={(v) => onChange(v, "plants", plantName)}
      />
    );
  }

  let messageComps = [];
  for (let i = 0; i < messages.length; i++) {
    messageComps.push(
      <div className="message error" key={i}>
        <p>{messages[i]}</p>
        <Button label="Dismiss" onClick={() => onDismissMessage(i)} />
      </div>
    );
  }

  const onFileSelected = () => {
    const file = fileElem.current.files[0];
    if (file) {
      const reader = new FileReader();
      reader.addEventListener("load", () => {
        onLoad(reader.result);
      });
      reader.readAsText(file);
    }
    fileElem.current.value = "";
  };

  return (
    <>
      <Header title="Case Builder">
        <Button label="Clear" disabled={processing} onClick={onClear} />
        <Button
          label="Load"
          disabled={processing}
          onClick={(e) => fileElem.current.click()}
        />
        <Button label="Save" disabled={processing} onClick={onSave} />
        <Button label="Submit" disabled={processing} onClick={onSubmit} />
        <input
          type="file"
          ref={fileElem}
          accept=".json"
          style={{ display: "none" }}
          onChange={onFileSelected}
        />
      </Header>
      <div id="contentBackground">
        <div id="content">
          <PipelineBlock
            onAddPlant={onAddPlant}
            onAddPlantOutput={onAddPlantOutput}
            onAddProduct={onAddProduct}
            onMovePlant={onMovePlant}
            onMoveProduct={onMoveProduct}
            onRenamePlant={onRenamePlant}
            onRenameProduct={onRenameProduct}
            onSetPlantInput={onSetPlantInput}
            onRemovePlant={onRemovePlant}
            onRemoveProduct={onRemoveProduct}
            plants={data.plants}
            products={data.products}
          />
          <ParametersBlock
            value={data.parameters}
            onChange={(v) => onChange(v, "parameters")}
          />
          {productComps}
          {plantComps}
        </div>
      </div>
      <div id="messageTray">{messageComps}</div>
      <Footer />
    </>
  );
};

export default InputPage;