import { types, flow, Instance, getParent } from "mobx-state-tree";
import messageUtil from "@/util/MessageUtil";
import { ChatContext } from "@/views/stores/InputStore";
import yaml from "js-yaml";
import { RootInstance } from "./RootStore";
import { useTranslation } from "react-i18next";
import i18next from "i18next";

interface Context {
  content: string;
  role: string;
}

interface Entry {
  hash: string;
  type: string;
  user: string;
  date: string;
  request: string;
  response: string;
  context: Context[];
}

interface LoadHistoryMessage {
  command: string;
  entries: Entry[];
}

export const fetchHistoryMessages = async (params) => {
  const { pageIndex } = params;
  return new Promise<{ pageIndex: number; entries: Entry[] }>(
    (resolve, reject) => {
      try {
        messageUtil.sendMessage({
          command: "historyMessages",
          page: pageIndex,
        });
        messageUtil.registerHandler(
          "loadHistoryMessages",
          (message: LoadHistoryMessage) => {
            resolve({
              pageIndex: pageIndex,
              entries: message.entries,
            });
          }
        );
      } catch (e) {
        reject(e);
      }
    }
  );
};

interface DevChatInstalledMessage {
  command: string;
  result: boolean;
}

export const deleteMessage = async (messageHash: string) => {
  return new Promise<{ hash: string }>((resolve, reject) => {
    try {
      messageUtil.sendMessage({
        command: "deleteChatMessage",
        hash: messageHash,
      });
      messageUtil.registerHandler("deletedChatMessage", (message) => {
        resolve({
          hash: message.hash,
        });
      });
    } catch (e) {
      reject(e);
    }
  });
};

export const Message = types.model({
  index: types.maybe(types.number),
  hash: types.maybe(types.string),
  type: types.enumeration(["user", "bot", "system"]),
  message: types.string,
  contexts: types.maybe(types.array(ChatContext)),
});

export const ChatStore = types
  .model("Chat", {
    generating: false,
    responsed: false,
    currentMessage: "",
    hasDone: false,
    errorMessage: "",
    messages: types.array(Message),
    pageIndex: 0,
    isLastPage: false,
    isBottom: true,
    isTop: false,
    scrollBottom: 0,
    chatPanelWidth: 300,
    disabled: false,
    rechargeSite: "https://web.devchat.ai/pricing/",
    features: types.optional(types.frozen(), {}),
    key: types.optional(types.string, ""),
  })
  .actions((self) => {
    const goScrollBottom = () => {
      self.scrollBottom++;
    };

    const helpWorkflowCommands = () => {
      const rootStore = getParent<RootInstance>(self);

      const recommendCommands = rootStore.input.commandMenus
        .filter((item) => item.recommend > -1)
        .sort((a, b) => a.recommend - b.recommend);

      if (recommendCommands.length > 0) {
        return recommendCommands
          .map((item) => {
            if (item.name === "help") {
              return "";
            }
            return `<a class="workflow_command" href="${
              item.pattern
            }">${i18next.t(
              `/${item.name}`
            )}:<span style="color:var(--vscode-editor-foreground)">${i18next.t(
              `${item.description}`
            )}</span></a>`;
          })
          .join("\n\n");
      }

      return rootStore.input.commandMenus
        .map((item) => {
          if (item.name === "help") {
            return "";
          }
          return `<a class="workflow_command" href="${item.pattern}">/${item.name}: <span style="color:var(--vscode-editor-foreground)"> ${item.description} </span></a>`;
        })
        .join("\n\n");
    };

    const lastNonEmptyHash = () => {
      let lastNonEmptyHash;
      for (let i = self.messages.length - 1; i >= 0; i--) {
        if (self.messages[i].hash) {
          lastNonEmptyHash = self.messages[i].hash;
          break;
        }
      }
      return lastNonEmptyHash === "message" ? null : lastNonEmptyHash;
    };

    // Process and send the message to the extension
    const contextInfo = (chatContexts) =>
      chatContexts.map((item, index: number) => {
        const { file, path, content, command } = item;
        return {
          file,
          context: {
            path: path,
            command: command,
            content: content,
          },
        };
      });

    const startGenerating = (text: string, chatContexts) => {
      self.generating = true;
      self.responsed = false;
      self.hasDone = false;
      self.errorMessage = "";
      self.currentMessage = "";
      const chatModel = getParent<RootInstance>(self).config.getDefaultModel();
      messageUtil.sendMessage({
        command: "sendMessage",
        text: text,
        contextInfo: contextInfo(chatContexts),
        parent_hash: lastNonEmptyHash(),
        model: chatModel,
      });
    };

    const helpMessage = (originalMessage = false) => {
      let helps = `
Do you want to write some code or have a question about the project? Simply right-click on your chosen files or code snippets and add them to DevChat. Feel free to ask me anything or let me help you with coding.
    
To see a list of workflows you can run in the context, just type "/". Happy prompting!

To get started, here are some of the things that I can do for you:

${helpWorkflowCommands()}`;

      const setKeyMessage = `
Your DevChat Access Key is not detected in the current settings. Please set your Access Key below, and we'll have everything set up for you in no time.

<button value="get_devchat_key" ${
        process.env.platform === "vscode"
          ? 'href="https://web.devchat.ai" component="a"'
          : ""
      }>Get DevChat key</button>
<button value="setting_devchat_key">Set DevChat key</button>
`;

      const setKeyUser = `Is DevChat Access Key ready?`;

      const accessKey = getParent<RootInstance>(self).config.getUserKey();

      if (accessKey === "") {
        self.messages.push(
          Message.create({
            type: "user",
            message: setKeyUser,
          })
        );
        self.messages.push(
          Message.create({
            type: "bot",
            message: setKeyMessage,
          })
        );
      } else {
        self.messages.push(
          Message.create({
            type: "user",
            message: originalMessage ? "How do I use DevChat?" : "/help",
          })
        );
        self.messages.push(
          Message.create({
            type: "bot",
            message: helps,
          })
        );
      }

      // const rootStore = getParent<RootInstance>(self);

      // setTimeout(() => {
      //   rootStore.chat.startResponsing("form settimeout");
      //   setTimeout(() => {
      //     rootStore.chat.stopGenerating(true, "123123", "form settimeout stop");
      //     rootStore.chat.happendError("form settimeout error");
      //   }, 1000);
      // }, 1000);

      // goto bottom
      goScrollBottom();
    };

    const sendLastUserMessage = () => {
      const lastUserMessage = self.messages[self.messages.length - 2];
      const lastBotMessage = self.messages[self.messages.length - 1];
      if (lastUserMessage && lastUserMessage.type === "user") {
        startGenerating(lastUserMessage.message, lastUserMessage.contexts);
      }
      self.disabled = false;
    };

    const cancelDevchatAsk = () => {
      const lastBotMessage = self.messages[self.messages.length - 1];
      if (lastBotMessage && lastBotMessage.type === "bot") {
        lastBotMessage.message =
          "You've cancelled the question. Please let me know if you have any other questions or if there's anything else I can assist with.";
      }
      self.disabled = false;
    };

    const commonMessage = (text: string, chatContexts) => {
      self.messages.push({
        type: "user",
        message: text,
        contexts: chatContexts,
      });
      self.messages.push({
        type: "bot",
        message: "",
      });
      // start generating
      startGenerating(text, chatContexts);
      // goto bottom
      goScrollBottom();
    };

    const userInput = (values: any) => {
      const inputStr = `
\`\`\`yaml type=chatmark-values
${yaml.dump(values)}
\`\`\`
`;
      self.currentMessage = `
${self.currentMessage}
${inputStr}
\`\`\`Step
Thinking...
\`\`\`
      `;
      messageUtil.sendMessage({
        command: "userInput",
        text: inputStr,
      });
      // goto bottom
      goScrollBottom();
    };

    const startResponsing = (message: string) => {
      self.responsed = true;
      self.currentMessage = message;
    };

    return {
      helpMessage,
      sendLastUserMessage,
      cancelDevchatAsk,
      goScrollBottom,
      startGenerating,
      commonMessage,
      userInput,
      helpWorkflowCommands,
      startResponsing,
      devchatAsk: flow(function* (userMessage, chatContexts) {
        self.messages.push({
          type: "user",
          contexts: chatContexts,
          message: userMessage,
        });

        self.messages.push({
          type: "bot",
          message: "",
        });
        startGenerating(userMessage, chatContexts);

        // goto bottom
        goScrollBottom();
      }),
      updateChatPanelWidth: (width: number) => {
        self.chatPanelWidth = width;
      },
      changeChatModel: (chatModel: string) => {
        const rootStore = getParent<RootInstance>(self);
        rootStore.config.setConfigValue("default_model", chatModel);
      },
      updateFeatures: (features: any) => {
        self.features = features;
      },
      startSystemMessage: () => {
        self.generating = true;
        self.responsed = false;
        self.hasDone = false;
        self.errorMessage = "";
        self.currentMessage = "";
      },
      reGenerating: () => {
        self.generating = true;
        self.responsed = false;
        self.hasDone = false;
        self.errorMessage = "";
        self.currentMessage = "";
        messageUtil.sendMessage({
          command: "regeneration",
        });
      },
      stopGenerating: (
        hasDone: boolean,
        hash: string = "",
        message: string = ""
      ) => {
        self.generating = false;
        self.responsed = false;
        self.hasDone = hasDone;
        self.currentMessage = message;
        const messagesLength = self.messages.length;
        if (hasDone) {
          if (messagesLength > 1) {
            self.messages[messagesLength - 2].hash = hash;
            self.messages[messagesLength - 1].hash = hash;
          } else if (messagesLength > 0) {
            self.messages[messagesLength - 1].hash = hash;
          }
        } else {
          self.messages[messagesLength - 1].message = message;
        }
      },

      newMessage: (message: IMessage) => {
        self.messages.push(message);
      },
      addMessages: (messages: IMessage[]) => {
        self.messages.push(...messages);
      },
      updateLastMessage: (message: string) => {
        console.log("message: ", message);
        if (self.messages.length > 0) {
          self.messages[self.messages.length - 1].message = message;
          // if (message === "") {
          //   self.messages[self.messages.length - 1].message = message;
          // } else if (
          //   self.messages[self.messages.length - 1].message !== message
          // ) {
          //   self.messages[self.messages.length - 1].message += message;
          // }
        }
      },
      shiftMessage: () => {
        self.messages.splice(0, 1);
      },
      popMessage: () => {
        self.messages.pop();
      },
      clearMessages: () => {
        self.messages.length = 0;
      },
      happendError: (errorMessage: string) => {
        self.errorMessage = errorMessage;
      },
      onMessagesTop: () => {
        self.isTop = true;
        self.isBottom = false;
      },
      onMessagesBottom: () => {
        self.isTop = false;
        self.isBottom = true;
      },
      onMessagesMiddle: () => {
        self.isTop = false;
        self.isBottom = false;
      },
      reloadMessage: ({ entries, pageIndex, reset }) => {
        if (entries.length > 0) {
          self.pageIndex = pageIndex;
          const messages = entries
            .map((entry, index) => {
              const { hash, user, date, request, response, context } = entry;
              const chatContexts = context?.map(({ content }) => {
                return JSON.parse(content);
              });
              return [
                {
                  type: "user",
                  message: request,
                  contexts: chatContexts,
                  date: date,
                  hash: hash,
                },
                { type: "bot", message: response, date: date, hash: hash },
              ];
            })
            .flat();
          if (self.pageIndex === 0) {
            self.messages = messages;
          } else if (self.pageIndex > 0) {
            self.messages.concat(...messages);
          }
        } else {
          self.isLastPage = true;
          if (reset) {
            self.messages = [] as any;
            self.errorMessage = "";
          }
          if (self.messages.length === 0) {
            helpMessage(true);
          }
        }
      },
      fetchHistoryMessages: () => {
        self.isLastPage = true;
        if (self.messages.length === 0) {
          helpMessage(true);
        }
      },
      deleteMessage: flow(function* (messageHash: string) {
        const { hash } = yield deleteMessage(messageHash);
        const index = self.messages.findIndex(
          (item: any) => item.hash === hash
        );
        if (index > -1) {
          self.messages.splice(index);
        }
      }),
    };
  });

export type IMessage = Instance<typeof Message>;