#!/usr/bin/env python

import sys
import re
import readline
import traceback
import argparse
from rich.console import Console
from rich.live import Live
from rich.text import Text
from rich.markdown import Markdown

from tqdm import tqdm

from pathlib import Path

import os
import openai

from dump import dump

import prompts

history_file = ".coder.history"
try:
    readline.read_history_file(history_file)
except FileNotFoundError:
    pass

openai.api_key = os.getenv("OPENAI_API_KEY")


def find_index(list1, list2):
    for i in range(len(list1)):
        if list1[i : i + len(list2)] == list2:
            return i
    return -1


class Coder:
    fnames = dict()
    last_modified = 0

    def __init__(self, use_gpt_4, files, colorize):
        if use_gpt_4:
            self.main_model = "gpt-4"
        else:
            self.main_model = "gpt-3.5-turbo"

        for fname in files:
            self.fnames[fname] = Path(fname).stat().st_mtime

        self.check_for_local_edits(True)

        self.console = Console(record=True)
        self.colorize = colorize

    def files_modified(self):
        for fname, mtime in self.fnames.items():
            if Path(fname).stat().st_mtime != mtime:
                return True

    def request(self, prompt):
        self.request_prompt = prompt

    def quoted_file(self, fname):
        prompt = "\n"
        prompt += fname
        prompt += "\n```\n"
        prompt += Path(fname).read_text()
        prompt += "\n```\n"
        return prompt

    def get_files_content(self):
        prompt = ""
        for fname in self.fnames:
            prompt += self.quoted_file(fname)
        return prompt

    def get_input(self):
        self.console.rule()
        inp = ""
        num_control_c = 0
        while not inp.strip():
            try:
                inp = input("> ")
            except EOFError:
                return
            except KeyboardInterrupt:
                num_control_c += 1
                self.console.print()
                if num_control_c >= 2:
                    return
                self.console.print("[bold red]^C again to quit")

        ###
        self.console.print(f"[green]> {inp.strip()}")
        self.console.print()

        readline.write_history_file(history_file)
        return inp

    def check_for_local_edits(self, init=False):
        last_modified = max(Path(fname).stat().st_mtime for fname in self.fnames)
        since = last_modified - self.last_modified
        self.last_modified = last_modified
        if init:
            return
        if since > 0:
            return True
        return False

    def get_files_messages(self):
        files_content = prompts.files_content_prefix
        files_content += self.get_files_content()

        files_messages = [
            dict(role="user", content=files_content),
            dict(role="assistant", content="Ok."),
            dict(
                role="system",
                content=prompts.files_content_suffix + prompts.system_reminder,
            ),
        ]

        return files_messages

    def run(self):
        self.done_messages = []
        self.cur_messages = []

        while True:
            html = self.console.export_html()
            Path("tmp.html").write_text(html)

            inp = self.get_input()
            if inp is None:
                return

            if self.check_for_local_edits():
                # files changed, move cur messages back behind the files messages
                self.done_messages += self.cur_messages
                self.done_messages += [
                    dict(role="user", content=prompts.files_content_local_edits),
                    dict(role="assistant", content="Ok."),
                ]
                self.cur_messages = []

            self.cur_messages += [
                dict(role="user", content=inp),
            ]

            # self.show_messages(self.done_messages, "done")
            # self.show_messages(self.files_messages, "files")
            # self.show_messages(self.cur_messages, "cur")

            messages = [
                dict(
                    role="system", content=prompts.main_system + prompts.system_reminder
                ),
            ]
            messages += self.done_messages
            messages += self.get_files_messages()
            messages += self.cur_messages

            # self.show_messages(messages, "all")

            content = self.send(messages)

            self.cur_messages += [
                dict(role="assistant", content=content),
            ]

            self.console.print()

            try:
                edited = self.update_files(content, inp)
            except Exception as err:
                print(err)
                print()
                traceback.print_exc()
                edited = None

            if not edited:
                continue

            self.check_for_local_edits(True)
            self.done_messages += self.cur_messages
            self.done_messages += [
                dict(role="user", content=prompts.files_content_gpt_edits),
                dict(role="assistant", content="Ok."),
            ]
            self.cur_messages = []

    def show_messages(self, messages, title):
        print(title.upper(), "*" * 50)

        for msg in messages:
            print()
            print("-" * 50)
            role = msg["role"].upper()
            content = msg["content"].splitlines()
            for line in content:
                print(role, line)

    def send(self, messages, model=None, show_progress=0):
        # self.show_messages(messages, "all")

        if not model:
            model = self.main_model

        completion = openai.ChatCompletion.create(
            model=model,
            messages=messages,
            temperature=0,
            stream=True,
        )

        if show_progress:
            return self.show_send_progress(completion, show_progress)
        elif self.colorize:
            return self.show_send_output_color(completion)
        else:
            return self.show_send_output_plain(completion)

    def show_send_progress(self, completion, show_progress):
        resp = []
        pbar = tqdm(total=show_progress)
        for chunk in completion:
            try:
                text = chunk.choices[0].delta.content
                resp.append(text)
            except AttributeError:
                continue

            pbar.update(len(text))

        pbar.update(show_progress)
        pbar.close()

        resp = "".join(resp)
        return resp

    def show_send_output_plain(self, completion):
        resp = ""

        for chunk in completion:
            if chunk.choices[0].finish_reason not in (None, "stop"):
                dump(chunk.choices[0].finish_reason)
            try:
                text = chunk.choices[0].delta.content
                resp += text
            except AttributeError:
                continue

            sys.stdout.write(text)
            sys.stdout.flush()

        return resp

    def show_send_output_color(self, completion):
        resp = ""

        with Live(vertical_overflow="scroll") as live:
            for chunk in completion:
                if chunk.choices[0].finish_reason not in (None, "stop"):
                    dump(chunk.choices[0].finish_reason)
                try:
                    text = chunk.choices[0].delta.content
                    resp += text
                except AttributeError:
                    continue

                md = Markdown(resp, style="blue", code_theme="default")
                live.update(md)

            live.update(Text(""))
            live.stop()

        md = Markdown(resp, style="blue", code_theme="default")
        self.console.print(md)

        return resp

    pattern = re.compile(
        r"(\S+)\s+(```\s*)?<<<<<<< ORIGINAL\n(.*?\n?)=======\n(.*?\n?)>>>>>>> UPDATED",
        re.MULTILINE | re.DOTALL,
    )

    def update_files(self, content, inp):
        edited = set()
        for match in self.pattern.finditer(content):
            path, _, original, updated = match.groups()

            edited.add(path)
            if self.do_replace(path, original, updated):
                continue
            edit = match.group()
            self.do_gpt_powered_replace(path, edit, inp)

        return edited

    def do_replace(self, fname, before_text, after_text):
        before_text = self.strip_quoted_wrapping(before_text, fname)
        after_text = self.strip_quoted_wrapping(after_text, fname)

        fname = Path(fname)

        # does it want to make a new file?
        if not fname.exists() and not before_text:
            print("Creating empty file:", fname)
            fname.touch()

        content = fname.read_text().splitlines()

        if not before_text and not content:
            # first populating an empty file
            new_content = after_text
        else:
            before_lines = [line.strip() for line in before_text.splitlines()]
            stripped_content = [line.strip() for line in content]
            where = find_index(stripped_content, before_lines)

            if where < 0:
                return

            new_content = content[:where]
            new_content += after_text.splitlines()
            new_content += content[where + len(before_lines) :]
            new_content = "\n".join(new_content) + "\n"

        fname.write_text(new_content)
        self.console.print(f"Applied edit to {fname}")
        return True

    def do_gpt_powered_replace(self, fname, edit, request):
        model = "gpt-3.5-turbo"
        print(f"Asking {model} to apply ambiguous edit to {fname}...")

        fname = Path(fname)
        content = fname.read_text()
        prompt = prompts.editor_user.format(
            request=request,
            edit=edit,
            fname=fname,
            content=content,
        )

        messages = [
            dict(role="system", content=prompts.editor_system),
            dict(role="user", content=prompt),
        ]
        res = self.send(
            messages, show_progress=len(content) + len(edit) / 2, model=model
        )
        res = self.strip_quoted_wrapping(res, fname)
        fname.write_text(res)

    def strip_quoted_wrapping(self, res, fname=None):
        if not res:
            return res

        res = res.splitlines()

        if fname and res[0].strip().endswith(Path(fname).name):
            res = res[1:]

        if res[0].startswith("```") and res[-1].startswith("```"):
            res = res[1:-1]

        res = "\n".join(res)
        if res and res[-1] != "\n":
            res += "\n"

        return res


def main():
    parser = argparse.ArgumentParser(description="Chat with GPT about code")
    parser.add_argument(
        "files", metavar="FILE", nargs="+", help="a list of source code files"
    )
    parser.add_argument(
        "-3",
        "--gpt-3-5-turbo",
        action="store_true",
        help="Only use gpt-3.5-turbo, not gpt-4",
    )
    parser.add_argument(
        "--no-color",
        action="store_false",
        dest="colorize",
        default=True,
        help="Disable colorized output of GPT responses",
    )

    args = parser.parse_args()

    use_gpt_4 = not args.gpt_3_5_turbo
    fnames = args.files
    colorize = args.colorize

    coder = Coder(use_gpt_4, fnames, colorize)
    coder.run()


if __name__ == "__main__":
    status = main()
    sys.exit(status)