// components/Calendar.js
import { $, h } from "sigpro";

export const Calendar = (props) => {
  const internalDate = $(new Date());
  const hoverDate = $(null);
  const startHour = $(0);
  const endHour = $(0);
  
  const isRangeMode = () => {
    const r = typeof props.range === "function" ? props.range() : props.range;
    return r === true;
  };
  
  const now = new Date();
  const todayStr = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, "0")}-${String(now.getDate()).padStart(2, "0")}`;
  
  const formatDate = (d) => {
    const year = d.getFullYear();
    const month = String(d.getMonth() + 1).padStart(2, "0");
    const day = String(d.getDate()).padStart(2, "0");
    return `${year}-${month}-${day}`;
  };
  
  const getCurrentValue = () => {
    return typeof props.value === "function" ? props.value() : props.value;
  };
  
  const selectDate = (date) => {
    const dateStr = formatDate(date);
    const current = getCurrentValue();
    
    if (isRangeMode()) {
      if (!current?.start || (current.start && current.end)) {
        const newValue = {
          start: dateStr,
          end: null,
          ...(props.hour && { startHour: startHour() }),
        };
        props.onChange?.(newValue);
      } else {
        const start = current.start;
        let newValue;
        if (dateStr < start) {
          newValue = { start: dateStr, end: start };
        } else {
          newValue = { start, end: dateStr };
        }
        if (props.hour) {
          newValue.startHour = current.startHour !== undefined ? current.startHour : startHour();
          newValue.endHour = endHour();
        }
        props.onChange?.(newValue);
      }
    } else {
      const newValue = props.hour ? `${dateStr}T${String(startHour()).padStart(2, "0")}:00:00` : dateStr;
      props.onChange?.(newValue);
    }
  };
  
  const move = (m) => {
    const d = internalDate();
    internalDate(new Date(d.getFullYear(), d.getMonth() + m, 1));
  };
  
  const moveYear = (y) => {
    const d = internalDate();
    internalDate(new Date(d.getFullYear() + y, d.getMonth(), 1));
  };
  
  const HourSlider = ({ value: hVal, onChange: onHourChange }) => {
    return h("div", { class: "flex-1" }, [
      h("div", { class: "flex gap-2 items-center" }, [
        h("input", {
          type: "range",
          min: 0,
          max: 23,
          value: hVal,
          class: "range range-xs flex-1",
          oninput: (e) => onHourChange(parseInt(e.target.value))
        }),
        h("span", { class: "text-sm font-mono min-w-[48px] text-center" }, 
          () => String(typeof hVal === "function" ? hVal() : hVal).padStart(2, "0") + ":00"
        )
      ])
    ]);
  };
  
  return h("div", { class: `p-4 bg-base-100 border border-base-300 shadow-2xl rounded-box w-80 select-none ${props.class ?? ''}`.trim() }, [
    h("div", { class: "flex justify-between items-center mb-4 gap-1" }, [
      h("div", { class: "flex gap-0.5" }, [
        h("button", { type: "button", class: "btn btn-ghost btn-xs px-1", onclick: () => moveYear(-1) }, 
          h("span", { class: "icon-[lucide--chevrons-left]" })
        ),
        h("button", { type: "button", class: "btn btn-ghost btn-xs px-1", onclick: () => move(-1) }, 
          h("span", { class: "icon-[lucide--chevron-left]" })
        )
      ]),
      h("span", { class: "font-bold uppercase flex-1 text-center" }, [
        () => internalDate().toLocaleString("es-ES", { month: "short", year: "numeric" })
      ]),
      h("div", { class: "flex gap-0.5" }, [
        h("button", { type: "button", class: "btn btn-ghost btn-xs px-1", onclick: () => move(1) }, 
          h("span", { class: "icon-[lucide--chevron-right]" })
        ),
        h("button", { type: "button", class: "btn btn-ghost btn-xs px-1", onclick: () => moveYear(1) }, 
          h("span", { class: "icon-[lucide--chevrons-right]" })
        )
      ])
    ]),
    
    h("div", { class: "grid grid-cols-7 gap-1", onmouseleave: () => hoverDate(null) }, [
      ...["L", "M", "X", "J", "V", "S", "D"].map((d) => h("div", { class: "text-[10px] opacity-40 font-bold text-center" }, d)),
      () => {
        const d = internalDate();
        const year = d.getFullYear();
        const month = d.getMonth();
        const firstDay = new Date(year, month, 1).getDay();
        const offset = firstDay === 0 ? 6 : firstDay - 1;
        const daysInMonth = new Date(year, month + 1, 0).getDate();
        
        const cells = [];
        for (let i = 0; i < offset; i++) cells.push(h("div"));
        
        for (let i = 1; i <= daysInMonth; i++) {
          const date = new Date(year, month, i);
          const dStr = formatDate(date);
          
          cells.push(
            h("button", {
              type: "button",
              class: () => {
                const v = getCurrentValue();
                const h = hoverDate();
                const isStart = typeof v === "string" ? v.split("T")[0] === dStr : v?.start === dStr;
                const isEnd = v?.end === dStr;
                let inRange = false;
                
                if (isRangeMode() && v?.start) {
                  const start = v.start;
                  if (!v.end && h) {
                    inRange = (dStr > start && dStr <= h) || (dStr < start && dStr >= h);
                  } else if (v.end) {
                    inRange = dStr > start && dStr < v.end;
                  }
                }
                
                const base = "btn btn-xs p-0 aspect-square min-h-0 h-auto font-normal relative";
                const state = isStart || isEnd ? "btn-primary z-10" : inRange ? "bg-primary/20 border-none rounded-none" : "btn-ghost";
                const today = dStr === todayStr ? "ring-1 ring-primary ring-inset font-black text-primary" : "";
                
                return `${base} ${state} ${today}`.trim();
              },
              onmouseenter: () => { if (isRangeMode()) hoverDate(dStr); },
              onclick: () => selectDate(date)
            }, i.toString())
          );
        }
        return cells;
      }
    ]),
    
    props.hour ? h("div", { class: "mt-3 pt-2 border-t border-base-300" }, [
      isRangeMode()
        ? h("div", { class: "flex gap-4" }, [
            HourSlider({ value: startHour, onChange: (h) => startHour(h) }),
            HourSlider({ value: endHour, onChange: (h) => endHour(h) })
          ])
        : HourSlider({ value: startHour, onChange: (h) => startHour(h) })
    ]) : null
  ]);
};