import { useState } from "react";
import { useDebounce } from "@/hooks/use-debounce";
import { useTeamMembersList } from "@/domain/team-members/use-cases/use-team-members-list";
import type { TeamMemberListItem } from "@/domain/team-members/types/team-member";
import {
  Alert,
  Avatar,
  Box,
  Button,
  Chip,
  Drawer,
  IconButton,
  Stack,
  Tab,
  Tabs,
  TextField,
  Typography,
} from "@mui/material";
import CloseIcon from "@mui/icons-material/Close";
import { TeamMembersTable } from "./_components/team-members-table";
import { AddTeamMemberDialog } from "./_components/add-team-member-dialog";

type StatusTab = "active" | "inactive";

const STATUS_LABELS: Record<StatusTab, "Active" | "Inactive"> = {
  active: "Active",
  inactive: "Inactive",
};

function MemberStatus({ status }: { status: TeamMemberListItem["status"] }) {
  return <Chip size="small" label={status} color={status === "Active" ? "success" : "default"} />;
}

function TeamMemberDrawer({
  member,
  onClose,
}: {
  member: TeamMemberListItem | null;
  onClose: () => void;
}) {
  return (
    <Drawer anchor="right" open={Boolean(member)} onClose={onClose}>
      <Box sx={{ width: { xs: "100vw", sm: 380 }, p: 3 }}>
        <Stack
          direction="row"
          sx={{ alignItems: "center", justifyContent: "space-between", mb: 3 }}
        >
          <Typography variant="h6">Team Member</Typography>
          <IconButton aria-label="Close team member details" onClick={onClose}>
            <CloseIcon />
          </IconButton>
        </Stack>
        {member !== null && (
          <Stack spacing={2}>
            <Stack direction="row" spacing={2} sx={{ alignItems: "center" }}>
              <Avatar sx={{ bgcolor: member.color || "primary.main" }}>
                {member.name.slice(0, 1).toUpperCase() || "?"}
              </Avatar>
              <Box>
                <Typography variant="h6">{member.name || "—"}</Typography>
                <Typography color="text.secondary">{member.role || "—"}</Typography>
              </Box>
            </Stack>
            <MemberStatus status={member.status} />
            <Typography>
              <strong>Service Area:</strong> {member.serviceArea || "—"}
            </Typography>
            <Typography>
              <strong>Phone:</strong> {member.phone || "—"}
            </Typography>
            <Typography>
              <strong>Email:</strong> {member.email || "—"}
            </Typography>
          </Stack>
        )}
      </Box>
    </Drawer>
  );
}

export default function TeamMembersListPage() {
  const [search, setSearch] = useState("");
  const [tab, setTab] = useState<StatusTab>("active");
  const [selectedMember, setSelectedMember] = useState<TeamMemberListItem | null>(null);
  const [addMemberOpen, setAddMemberOpen] = useState(false);
  const debouncedSearch = useDebounce(search, 300).trim().toLowerCase();
  const { data, isLoading, error } = useTeamMembersList();
  const allMembers = data?.items ?? [];

  const activeCount = allMembers.filter((member) => member.status === "Active").length;
  const inactiveCount = allMembers.length - activeCount;
  const rows = allMembers
    .filter((member) => member.status === STATUS_LABELS[tab])
    .filter((member) => !debouncedSearch || member.name.toLowerCase().includes(debouncedSearch));

  return (
    <Box
      className="flex h-full flex-col overflow-hidden"
      sx={{ backgroundColor: "var(--color-bg-page)" }}
    >
      <Stack
        direction={{ xs: "column", sm: "row" }}
        spacing={2}
        sx={{
          alignItems: { xs: "stretch", sm: "center" },
          justifyContent: "space-between",
          p: 2.5,
          backgroundColor: "var(--color-bg-surface)",
          borderBottom: "1px solid var(--color-border)",
        }}
      >
        <Box>
          <Typography variant="h4" component="h1">
            Team Members
          </Typography>
          <Typography variant="body2" color="text.secondary" sx={{ mt: 0.75 }}>
            {allMembers.length} team member{allMembers.length === 1 ? "" : "s"} · {activeCount}{" "}
            active
          </Typography>
        </Box>
        <Stack direction="row" spacing={1} sx={{ alignItems: "center" }}>
          <TextField
            size="small"
            value={search}
            onChange={(event) => setSearch(event.target.value)}
            placeholder="Search team member…"
            aria-label="Search team member"
            sx={{ width: 224 }}
          />
          <Button variant="contained" size="small" onClick={() => setAddMemberOpen(true)}>
            Add Member
          </Button>
        </Stack>
      </Stack>

      <Tabs
        value={tab}
        onChange={(_event, value: StatusTab) => setTab(value)}
        aria-label="Team member status"
      >
        <Tab value="active" label={`Active ${activeCount}`} />
        <Tab value="inactive" label={`Inactive ${inactiveCount}`} />
      </Tabs>

      {Boolean(error) && (
        <Alert severity="error">
          {error instanceof Error ? error.message : "Failed to load team members"}
        </Alert>
      )}

      <Box sx={{ flex: 1, overflow: "auto", p: 2 }}>
        <TeamMembersTable
          rows={rows}
          isLoading={isLoading}
          hasError={Boolean(error)}
          tab={tab}
          onOpen={setSelectedMember}
        />
      </Box>

      <Stack
        direction="row"
        sx={{
          justifyContent: "space-between",
          px: 2,
          py: 1,
          borderTop: "1px solid var(--color-border)",
          backgroundColor: "var(--color-bg-surface)",
        }}
      >
        <Typography variant="caption" color="text.secondary">
          {rows.length} {tab} team member{rows.length === 1 ? "" : "s"}
          {debouncedSearch ? " · filtered" : ""}
        </Typography>
        <Typography variant="caption" color="text.secondary">
          {activeCount} active · {inactiveCount} inactive
        </Typography>
      </Stack>

      <TeamMemberDrawer member={selectedMember} onClose={() => setSelectedMember(null)} />
      <AddTeamMemberDialog open={addMemberOpen} onClose={() => setAddMemberOpen(false)} />
    </Box>
  );
}