// L'import de React reste nécessaire si un outil compile le JSX en mode « classique » (React.createElement)
import React, { useEffect, useRef, useState, useSyncExternalStore } from "react";
import cliSpinners from "cli-spinners";
import { Badge } from "@inkjs/ui";
import { Box, Static, Text, useInput } from "ink";
import { Banner } from "./banner";
import { ERROR_TEXT, LIGHT_BLUE } from "./colors";
import { ContextBar } from "./context-bar";
import { Markdown } from "./markdown";
import type {
  ConfirmPromptState,
  InputPromptState,
  LogItem,
  PermissionFile,
  PromptState,
  SelectPromptState,
  UIState,
  UIStore,
} from "./store";

// ───────────── Journal ─────────────

const PERMISSION_KINDS = [
  { key: "allow", label: "ALLOW", color: "green" },
  { key: "ask", label: "ASK", color: "yellow" },
  { key: "deny", label: "DENY", color: "red" },
] as const;

/** Règles par fichier : chemin, puis un badge ALLOW / ASK / DENY suivi des règles du type (une par ligne). */
function PermissionsView({ files }: { files: PermissionFile[] }) {
  if (files.length === 0) {
    return <Text dimColor>Aucune règle de permission définie : chaque utilisation d'un outil demande une confirmation.</Text>;
  }
  return (
    <Box flexDirection="column">
      {files.map((file, i) => (
        <Box key={file.path} flexDirection="column" marginTop={i === 0 ? 0 : 1}>
          <Text bold>{`${file.path} :`}</Text>
          {PERMISSION_KINDS.filter((k) => file[k.key].length > 0).map((k) => (
            <Box key={k.key} flexDirection="column">
              <Badge color={k.color}>{k.label}</Badge>
              {file[k.key].map((rule) => (
                <Text key={rule}>{rule}</Text>
              ))}
            </Box>
          ))}
        </Box>
      ))}
    </Box>
  );
}

function LogLine({ item }: { item: LogItem }) {
  switch (item.kind) {
    case "intro":
      return <Banner title={item.text} />;
    case "outro":
      return <Text dimColor>{item.text}</Text>;
    case "info":
      return (
        <Box>
          <Box marginRight={1} flexShrink={0}>
            <Badge color="blue">INFO</Badge>
          </Box>
          <Text color={LIGHT_BLUE}>{item.text}</Text>
        </Box>
      );
    case "success":
      return (
        <Text>
          <Text color="green">✔ </Text>
          {item.text}
        </Text>
      );
    case "warn":
      return (
        <Box>
          <Box marginRight={1} flexShrink={0}>
            <Badge color="yellow">WARN</Badge>
          </Box>
          <Text>{item.text}</Text>
        </Box>
      );
    case "error":
      return (
        <Box>
          <Box marginRight={1} flexShrink={0}>
            <Badge color="red">FAIL</Badge>
          </Box>
          <Text color={ERROR_TEXT}>{item.text}</Text>
        </Box>
      );
    case "step":
      return (
        <Text>
          <Text color="blue">● </Text>
          {item.text}
        </Text>
      );
    case "result":
      return <Text dimColor>{item.text}</Text>;
    case "choice":
      return <Text dimColor>◆ {item.text}</Text>;
    case "user":
      return (
        <Box>
          <Text color="green" bold>
            {"› "}
          </Text>
          <Text>{item.text}</Text>
        </Box>
      );
    case "assistant":
      // Réponse finale rendue en markdown (voir markdown.tsx) ; le texte en cours de streaming reste brut.
      return <Markdown text={item.text} />;
    case "permissions":
      return <PermissionsView files={item.permissions ?? []} />;
    case "shell":
      return (
        <Box flexDirection="column">
          <Text>
            <Text color={item.failed ? "red" : "magenta"} bold>
              {"$ "}
            </Text>
            <Text bold>{item.text}</Text>
          </Text>
          {item.detail ? <Text dimColor>{item.detail}</Text> : null}
        </Box>
      );
  }
}

// ───────────── Spinners (cli-spinners) ─────────────

interface SpinnerDef {
  frames: string[];
  interval: number;
}

/** Marqueur animé à gauche de la zone de saisie. */
const INPUT_SPINNER = cliSpinners.arrow3;
const INPUT_COLOR = "greenBright";

/** Attente de la réponse (« En réflexion »), chargements, exécution d'une commande. */
const WAIT_SPINNER = cliSpinners.dots10;
const WAIT_COLOR = "yellowBright";

/** Image courante de l'animation (change toutes les `interval` ms). */
function useSpinnerFrame(spinner: SpinnerDef): string {
  const [index, setIndex] = useState(0);
  useEffect(() => {
    const timer = setInterval(() => setIndex((i) => (i + 1) % spinner.frames.length), spinner.interval);
    return () => clearInterval(timer);
  }, [spinner]);
  return spinner.frames[index] ?? "";
}

/** Spinner à gauche du libellé, libellé et spinner dans la même couleur. */
function Spinner({ label }: { label: string }) {
  const frame = useSpinnerFrame(WAIT_SPINNER);
  return <Text color={WAIT_COLOR}>{`${frame} ${label}`}</Text>;
}

// ───────────── Saisie de texte ─────────────

interface EditState {
  value: string;
  cursor: number;
  /** Position dans l'historique pendant la navigation ↑/↓, sinon null. */
  hist: number | null;
  /** Texte en cours de frappe avant d'entrer dans l'historique. */
  draft: string;
}

/** Bordure en pointillés (seuls les traits haut et bas sont affichés : voir borderLeft/borderRight). */
const DOTTED_BORDER = {
  topLeft: "┈",
  top: "┈",
  topRight: "┈",
  left: "┊",
  bottomLeft: "┈",
  bottom: "┈",
  bottomRight: "┈",
  right: "┊",
} as const;

const PLACEHOLDER = "Votre demande — /help : aide · § : skills · Ctrl+C : quitter";

function InputPrompt({ prompt }: { prompt: InputPromptState }) {
  const initial: EditState = { value: "", cursor: 0, hist: null, draft: "" };
  const [view, setView] = useState<EditState>(initial);
  // Source de vérité synchrone : plusieurs touches peuvent arriver avant le prochain rendu (collage, frappe rapide).
  const ref = useRef<EditState>(initial);
  const apply = (next: EditState) => {
    ref.current = next;
    setView(next);
  };

  useInput((input, key) => {
    const s = ref.current;

    if (key.ctrl && input === "c") return prompt.resolve(null);
    if (key.ctrl && input === "d" && s.value === "") return prompt.resolve(null);
    if (key.return) return prompt.resolve(s.value.trim());

    if (key.leftArrow) return apply({ ...s, cursor: Math.max(0, s.cursor - 1) });
    if (key.rightArrow) return apply({ ...s, cursor: Math.min(s.value.length, s.cursor + 1) });
    if (key.ctrl && input === "a") return apply({ ...s, cursor: 0 });
    if (key.ctrl && input === "e") return apply({ ...s, cursor: s.value.length });
    if (key.ctrl && input === "u") return apply({ ...s, value: s.value.slice(s.cursor), cursor: 0, hist: null });
    if (key.ctrl && input === "w") {
      const before = s.value.slice(0, s.cursor).replace(/\S+\s*$/, "");
      return apply({ ...s, value: before + s.value.slice(s.cursor), cursor: before.length, hist: null });
    }

    if (key.upArrow) {
      if (prompt.history.length === 0) return;
      const hist = s.hist === null ? prompt.history.length - 1 : Math.max(0, s.hist - 1);
      const value = prompt.history[hist] ?? "";
      return apply({ value, cursor: value.length, hist, draft: s.hist === null ? s.value : s.draft });
    }
    if (key.downArrow) {
      if (s.hist === null) return;
      if (s.hist >= prompt.history.length - 1) {
        return apply({ value: s.draft, cursor: s.draft.length, hist: null, draft: "" });
      }
      const hist = s.hist + 1;
      const value = prompt.history[hist] ?? "";
      return apply({ ...s, value, cursor: value.length, hist });
    }

    if (key.backspace || key.delete) {
      if (s.cursor === 0) return;
      return apply({
        ...s,
        value: s.value.slice(0, s.cursor - 1) + s.value.slice(s.cursor),
        cursor: s.cursor - 1,
        hist: null,
      });
    }

    if (key.ctrl || key.meta || key.tab || key.escape || !input) return;
    // Collage : une seule chaîne, éventuellement multi-lignes
    const text = input.replace(/\r\n?/g, "\n");
    apply({
      value: s.value.slice(0, s.cursor) + text + s.value.slice(s.cursor),
      cursor: s.cursor + text.length,
      hist: null,
      draft: s.draft,
    });
  });

  const frame = useSpinnerFrame(INPUT_SPINNER);
  const { value, cursor } = view;
  const at = value[cursor] ?? " ";
  return (
    <Box
      marginTop={1}
      borderStyle={DOTTED_BORDER}
      borderColor="greenBright"
      borderLeft={false}
      borderRight={false}
      paddingX={1}
    >
      <Text color={INPUT_COLOR} bold>
        {`${frame} `}
      </Text>
      {value === "" ? (
        <Text>
          <Text inverse> </Text>
          <Text dimColor>{PLACEHOLDER}</Text>
        </Text>
      ) : (
        <Text>
          {value.slice(0, cursor)}
          <Text inverse>{at === "\n" ? " " : at}</Text>
          {at === "\n" ? "\n" : ""}
          {value.slice(cursor + 1)}
        </Text>
      )}
    </Box>
  );
}

// ───────────── Liste de choix ─────────────

const SELECT_WINDOW = 10;

function SelectPrompt({ prompt }: { prompt: SelectPromptState }) {
  const n = prompt.choices.length;
  const [index, setIndex] = useState(prompt.initialIndex);
  const indexRef = useRef(prompt.initialIndex);
  const move = (next: number) => {
    indexRef.current = next;
    setIndex(next);
  };

  useInput((input, key) => {
    if (key.upArrow || input === "k") move((indexRef.current - 1 + n) % n);
    else if (key.downArrow || input === "j") move((indexRef.current + 1) % n);
    else if (key.return) prompt.resolve(prompt.choices[indexRef.current]?.value ?? null);
    else if (key.escape || (key.ctrl && input === "c")) prompt.resolve(null);
  });

  const start = Math.min(Math.max(0, index - Math.floor(SELECT_WINDOW / 2)), Math.max(0, n - SELECT_WINDOW));
  const visible = prompt.choices.slice(start, start + SELECT_WINDOW);

  return (
    <Box flexDirection="column" marginTop={1}>
      <Box>
        <Box marginRight={1} flexShrink={0}>
          <Badge color="green">ASK</Badge>
        </Box>
        <Text bold>{prompt.message}</Text>
      </Box>
      {visible.map((choice, i) => {
        const selected = start + i === index;
        return (
          <Text key={start + i} color={selected ? "cyan" : undefined}>
            {selected ? "❯ " : "  "}
            {choice.label}
            {choice.hint ? <Text dimColor> {choice.hint}</Text> : null}
          </Text>
        );
      })}
      <Text dimColor>
        ↑/↓ choisir · Entrée valider · Échap annuler{n > SELECT_WINDOW ? ` · ${index + 1}/${n}` : ""}
      </Text>
    </Box>
  );
}

// ───────────── Confirmation ─────────────

function ConfirmPrompt({ prompt }: { prompt: ConfirmPromptState }) {
  useInput((input, key) => {
    if (input === "o" || input === "O" || input === "y" || input === "Y") prompt.resolve(true);
    else if (input === "n" || input === "N" || key.escape || (key.ctrl && input === "c")) prompt.resolve(false);
    // Entrée seule est ignorée : une action sensible exige une réponse explicite.
  });
  return (
    <Box marginTop={1}>
      <Box marginRight={1} flexShrink={0}>
        <Badge color="green">ASK</Badge>
      </Box>
      <Text>
        {prompt.message} <Text dimColor>(o/n)</Text>
      </Text>
    </Box>
  );
}

function PromptView({ prompt, state }: { prompt: PromptState; state: UIState }) {
  switch (prompt.kind) {
    case "input":
      return (
        <Box flexDirection="column">
          <InputPrompt prompt={prompt} />
          {state.contextMax !== null ? <ContextBar used={state.contextUsed} max={state.contextMax} /> : null}
        </Box>
      );
    case "select":
      return <SelectPrompt prompt={prompt} />;
    case "confirm":
      return <ConfirmPrompt prompt={prompt} />;
  }
}

// ───────────── Application ─────────────

export function App({ store }: { store: UIStore }) {
  const state = useSyncExternalStore(store.subscribe, store.getSnapshot);

  // Hors saisie, Ctrl+C interrompt le tour en cours (ou quitte s'il n'y en a pas)
  useInput(
    (input, key) => {
      if (key.ctrl && input === "c" && !store.interrupt()) process.exit(130);
    },
    { isActive: state.prompt === null },
  );

  return (
    <>
      {/* Une ligne vide avant chaque message (plutôt qu'après : la marge finale d'un élément Static peut être perdue) */}
      <Static items={state.items}>
        {(item) => (
          <Box key={item.id} marginTop={1}>
            <LogLine item={item} />
          </Box>
        )}
      </Static>
      {state.streaming ? (
        <Box marginTop={1}>
          <Text>{state.streaming}</Text>
        </Box>
      ) : null}
      {state.busy ? (
        <Box marginTop={1}>
          <Spinner label={state.busy} />
        </Box>
      ) : null}
      {state.prompt ? <PromptView prompt={state.prompt} state={state} /> : null}
    </>
  );
}