import { useMemo, useState } from "react";

import type {
  ScheduledProjectTask,
  ScheduledTaskSchedule,
  ScheduledTaskWeekday,
} from "@/domain";
import type { ScheduledTaskDefinitionInput } from "@/ports";
import { Button, Field, Input } from "@/shared";
import { useI18n } from "@/i18n";

type Preset = "hourly" | "daily" | "weekly" | "custom";

const DAYS: Array<[ScheduledTaskWeekday, string, string]> = [
  ["monday", "Lun", "Mon"], ["tuesday", "Mar", "Tue"], ["wednesday", "Mer", "Wed"],
  ["thursday", "Jeu", "Thu"], ["friday", "Ven", "Fri"], ["saturday", "Sam", "Sat"], ["sunday", "Dim", "Sun"],
];

const control =
  "h-9 rounded-md border border-border bg-raised px-3 text-sm text-content outline-none focus:border-primary";

function initialPreset(schedule?: ScheduledTaskSchedule): Preset {
  if (!schedule) return "daily";
  if (schedule.kind === "interval" && schedule.everyMinutes === 60) return "hourly";
  if (schedule.kind === "interval") return "custom";
  return schedule.kind;
}

function shellWord(value: string): string {
  return /^[A-Za-z0-9_./:@%+=,-]+$/.test(value)
    ? value
    : `'${value.split("'").join(`'\\''`)}'`;
}

export function exactCommand(input: ScheduledTaskDefinitionInput): string {
  return [input.command.command, ...input.command.args].map(shellWord).join(" ");
}

type Tr = (french: string, english: string) => string;
const fr: Tr = (french) => french;

export function scheduleLabel(schedule: ScheduledTaskSchedule, tr: Tr = fr): string {
  if (schedule.kind === "interval") {
    return schedule.everyMinutes === 60
      ? tr("Toutes les heures", "Hourly")
      : tr(`Toutes les ${schedule.everyMinutes} minutes`, `Every ${schedule.everyMinutes} minutes`);
  }
  if (schedule.kind === "daily") return tr(`Chaque jour à ${schedule.time}`, `Every day at ${schedule.time}`);
  const frLabels = schedule.days.map((day) => DAYS.find(([key]) => key === day)?.[1] ?? day);
  const enLabels = schedule.days.map((day) => DAYS.find(([key]) => key === day)?.[2] ?? day);
  return tr(`Chaque semaine (${frLabels.join(", ")}) à ${schedule.time}`, `Every week (${enLabels.join(", ")}) at ${schedule.time}`);
}

export function ScheduledTaskForm({
  task,
  saving,
  onCancel,
  onSubmit,
}: {
  task?: ScheduledProjectTask;
  saving: boolean;
  onCancel: () => void;
  onSubmit: (input: ScheduledTaskDefinitionInput) => void;
}) {
  const { tr } = useI18n();
  const [name, setName] = useState(task?.name ?? "");
  const [description, setDescription] = useState(task?.description ?? "");
  const [command, setCommand] = useState(task?.command.command ?? "");
  const [args, setArgs] = useState(task?.command.args.join("\n") ?? "");
  const [cwd, setCwd] = useState(task?.command.cwd ?? ".");
  const [preset, setPreset] = useState<Preset>(initialPreset(task?.schedule));
  const [minutes, setMinutes] = useState(
    task?.schedule.kind === "interval" ? String(task.schedule.everyMinutes) : "15",
  );
  const [time, setTime] = useState(
    task?.schedule.kind === "daily" || task?.schedule.kind === "weekly"
      ? task.schedule.time
      : "09:00",
  );
  const [days, setDays] = useState<ScheduledTaskWeekday[]>(
    task?.schedule.kind === "weekly" ? task.schedule.days : ["monday"],
  );
  const [timezone, setTimezone] = useState(
    task?.timezone ?? Intl.DateTimeFormat().resolvedOptions().timeZone ?? "UTC",
  );
  const [timeoutMinutes, setTimeoutMinutes] = useState(
    task?.timeoutMs ? String(Math.round(task.timeoutMs / 60_000)) : "",
  );
  const [enabled, setEnabled] = useState(task?.approval === "pending" ? true : task?.enabled ?? true);
  const [review, setReview] = useState(false);

  const input = useMemo<ScheduledTaskDefinitionInput>(() => {
    const schedule: ScheduledTaskSchedule = preset === "hourly"
      ? { kind: "interval", everyMinutes: 60 }
      : preset === "custom"
        ? { kind: "interval", everyMinutes: Number(minutes) }
        : preset === "weekly"
          ? { kind: "weekly", days, time }
          : { kind: "daily", time };
    return {
      name: name.trim(),
      ...(description.trim() ? { description: description.trim() } : {}),
      command: {
        command: command.trim(),
        args: args.split("\n").map((arg) => arg.trim()).filter(Boolean),
        ...(cwd.trim() && cwd.trim() !== "." ? { cwd: cwd.trim() } : {}),
      },
      schedule,
      timezone: timezone.trim(),
      enabled,
      ...(timeoutMinutes ? { timeoutMs: Number(timeoutMinutes) * 60_000 } : {}),
    };
  }, [args, command, cwd, days, description, enabled, minutes, name, preset, time, timeoutMinutes, timezone]);

  const valid = input.name.length > 0 && input.command.command.length > 0 &&
    input.timezone.length > 0 &&
    (input.schedule.kind !== "interval" || input.schedule.everyMinutes >= 5) &&
    (input.schedule.kind !== "weekly" || input.schedule.days.length > 0) &&
    (!timeoutMinutes || Number(timeoutMinutes) > 0);

  if (review) {
    return (
      <div className="space-y-4">
        <div className="rounded-md border border-warning/50 bg-warning/10 p-3 text-sm text-content">
          {tr("Cette tâche pourra modifier ou supprimer des fichiers automatiquement.", "This task will be able to edit or delete files automatically.")}
        </div>
        <dl className="grid gap-2 text-sm sm:grid-cols-[9rem_1fr]">
          <dt className="text-muted">{tr("Commande exacte", "Exact command")}</dt><dd><code className="break-all">{exactCommand(input)}</code></dd>
          <dt className="text-muted">{tr("Dossier", "Directory")}</dt><dd><code>{input.command.cwd ?? "."}</code> ({tr("relatif au projet", "relative to project")})</dd>
          <dt className="text-muted">{tr("Fréquence", "Frequency")}</dt><dd>{scheduleLabel(input.schedule, tr)}</dd>
          <dt className="text-muted">{tr("Prochaine exécution", "Next run")}</dt><dd>{tr("Calculée par IdeA lors de l’activation", "Calculated by IdeA when enabled")}</dd>
          <dt className="text-muted">{tr("Fuseau horaire", "Time zone")}</dt><dd>{input.timezone}</dd>
          <dt className="text-muted">{tr("Permissions", "Permissions")}</dt><dd>{tr("Lecture, modification et suppression dans le projet", "Read, edit, and delete within the project")}</dd>
          <dt className="text-muted">{tr("Bac à sable", "Sandbox")}</dt><dd>{tr("Projet — lecture/écriture ; aucun accès en écriture hors projet", "Project — read/write; no write access outside the project")}</dd>
        </dl>
        <p className="text-xs text-muted">{tr("IdeA doit fonctionner et le projet doit être ouvert pour déclencher cette tâche.", "IdeA must be running and the project must be open to trigger this task.")}</p>
        <div className="flex justify-end gap-2">
          <Button onClick={() => setReview(false)}>{tr("Retour", "Back")}</Button>
          <Button variant="primary" loading={saving} onClick={() => onSubmit(input)}>
            {task?.approval === "pending" ? tr("Approuver et activer", "Approve and enable") : task ? tr("Enregistrer", "Save") : tr("Créer la tâche", "Create task")}
          </Button>
        </div>
      </div>
    );
  }

  return (
    <form className="space-y-4" onSubmit={(event) => { event.preventDefault(); enabled ? setReview(true) : onSubmit(input); }}>
      <div className="grid gap-3 sm:grid-cols-2">
        <Field label={tr("Nom", "Name")}>{({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} value={name} onChange={(e) => setName(e.target.value)} />}</Field>
        <Field label={tr("Dossier de travail", "Working directory")} hint={tr("Chemin relatif au projet ; « . » utilise sa racine.", "Path relative to the project; “.” uses its root.")}>
          {({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} value={cwd} onChange={(e) => setCwd(e.target.value)} />}
        </Field>
      </div>
      <Field label={task?.approval === "pending" ? tr("Motif de la demande", "Request reason") : tr("Description (facultative)", "Description (optional)")}>
        {({ id, describedBy }) => <textarea id={id} aria-describedby={describedBy} rows={2} className={`${control} h-auto py-2`} value={description} onChange={(e) => setDescription(e.target.value)} />}
      </Field>
      <Field label={tr("Commande", "Command")} hint={tr("Exécutable exact, sans interpolation shell.", "Exact executable, without shell interpolation.")}>
        {({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} value={command} onChange={(e) => setCommand(e.target.value)} placeholder="npm" />}
      </Field>
      <Field label={tr("Arguments", "Arguments")} hint={tr("Un argument littéral par ligne.", "One literal argument per line.")}>
        {({ id, describedBy }) => <textarea id={id} aria-describedby={describedBy} rows={3} className={`${control} h-auto py-2 font-mono`} value={args} onChange={(e) => setArgs(e.target.value)} placeholder={'run\nbuild'} />}
      </Field>
      <div className="grid gap-3 sm:grid-cols-2">
        <Field label={tr("Planification", "Schedule")}>
          {({ id }) => <select id={id} className={control} value={preset} onChange={(e) => setPreset(e.target.value as Preset)}>
            <option value="hourly">{tr("Toutes les heures", "Hourly")}</option><option value="daily">{tr("Chaque jour", "Daily")}</option>
            <option value="weekly">{tr("Chaque semaine", "Weekly")}</option><option value="custom">{tr("Personnalisée", "Custom")}</option>
          </select>}
        </Field>
        {preset === "custom" ? (
          <Field label={tr("Intervalle (minutes)", "Interval (minutes)")} error={Number(minutes) < 5 ? tr("Minimum : 5 minutes.", "Minimum: 5 minutes.") : undefined}>
            {({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} type="number" min={5} value={minutes} onChange={(e) => setMinutes(e.target.value)} />}
          </Field>
        ) : preset === "daily" || preset === "weekly" ? (
          <Field label={tr("Heure locale", "Local time")}>{({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} type="time" value={time} onChange={(e) => setTime(e.target.value)} />}</Field>
        ) : <div />}
      </div>
      {preset === "weekly" && <fieldset><legend className="mb-1 text-xs font-medium text-muted">{tr("Jours", "Days")}</legend><div className="flex flex-wrap gap-2">
        {DAYS.map(([key, frLabel, enLabel]) => <label key={key} className="flex items-center gap-1 rounded border border-border px-2 py-1 text-xs"><input type="checkbox" checked={days.includes(key)} onChange={() => setDays((current) => current.includes(key) ? current.filter((day) => day !== key) : [...current, key])} />{tr(frLabel, enLabel)}</label>)}
      </div></fieldset>}
      <div className="grid gap-3 sm:grid-cols-2">
        <Field label={tr("Fuseau horaire", "Time zone")} hint={tr("Identifiant IANA, par exemple Europe/Paris.", "IANA identifier, for example Europe/Paris.")}>{({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} value={timezone} onChange={(e) => setTimezone(e.target.value)} />}</Field>
        <Field label={tr("Limite de durée (minutes)", "Time limit (minutes)")} hint={tr("Vide : aucune limite.", "Empty: no limit.")}>{({ id, describedBy }) => <Input id={id} aria-describedby={describedBy} type="number" min={1} value={timeoutMinutes} onChange={(e) => setTimeoutMinutes(e.target.value)} />}</Field>
      </div>
      <div className="rounded-md border border-border bg-raised p-3 text-sm"><div className="font-medium">{tr("Permissions et bac à sable", "Permissions and sandbox")}</div><p className="mt-1 text-muted">{tr("Projet — lecture/écriture. La commande peut modifier ou supprimer des fichiers dans le projet ; l’écriture hors projet est refusée. Le réseau n’est pas isolé par ce profil V1.", "Project — read/write. The command can edit or delete files in the project; writes outside the project are denied. Network is not isolated by this V1 profile.")}</p></div>
      <label className="flex items-center gap-2 text-sm"><input type="checkbox" checked={enabled} onChange={(e) => setEnabled(e.target.checked)} />{tr("Activée", "Enabled")}</label>
      <div className="flex justify-end gap-2"><Button onClick={onCancel}>{tr("Annuler", "Cancel")}</Button><Button type="submit" variant="primary" disabled={!valid} loading={saving}>{enabled ? tr("Vérifier avant activation", "Review before enabling") : tr("Enregistrer", "Save")}</Button></div>
    </form>
  );
}