/**
 * Store Synchronization Composable
 *
 * Ensures that the legacy stores (streams, members, policies) always stay
 * synchronized with the new CoopBuilderStore. This makes the setup interface
 * the single source of truth while maintaining backward compatibility.
 */

export const useStoreSync = () => {
  const coopStore = useCoopBuilderStore();
  const streamsStore = useStreamsStore();
  const membersStore = useMembersStore();
  const policiesStore = usePoliciesStore();

  // Flags to prevent recursive syncing and duplicate watchers
  let isSyncing = false;
  let watchersSetup = false;

  // Sync CoopBuilder -> Legacy Stores
  const syncToLegacyStores = () => {
    if (isSyncing) return;
    isSyncing = true;
    // Sync streams
    streamsStore.resetStreams();
    coopStore.streams.forEach((stream: any) => {
      streamsStore.upsertStream({
        id: stream.id,
        name: stream.label,
        category: stream.category || "services",
        targetMonthlyAmount: stream.monthly,
        certainty: stream.certainty || "Probable",
        payoutDelayDays: 30,
        terms: "Net 30",
        targetPct: 0,
        revenueSharePct: 0,
        platformFeePct: 0,
        restrictions: "General",
        seasonalityWeights: new Array(12).fill(1),
        effortHoursPerMonth: 0,
      });
    });

    // Sync members
    membersStore.resetMembers();
    coopStore.members.forEach((member: any) => {
      membersStore.upsertMember({
        id: member.id,
        displayName: member.name,
        role: member.role || "",
        hoursPerWeek: Number(((member.hoursPerMonth || 0) / 4.33).toFixed(2)),
        minMonthlyNeeds: member.minMonthlyNeeds || 0,
        monthlyPayPlanned: member.monthlyPayPlanned || 0,
        targetMonthlyPay: member.targetMonthlyPay || 0,
        externalMonthlyIncome: member.externalMonthlyIncome || 0,
      });
    });

    // Sync policies - using individual update calls based on store structure
    policiesStore.updatePolicy("equalHourlyWage", coopStore.equalHourlyWage);
    policiesStore.updatePolicy("payrollOncostPct", coopStore.payrollOncostPct);
    policiesStore.updatePolicy(
      "savingsTargetMonths",
      coopStore.savingsTargetMonths
    );
    policiesStore.updatePolicy(
      "minCashCushionAmount",
      coopStore.minCashCushion
    );
    // Ensure pay policy relationship is kept in sync across stores
    if (coopStore.policy?.relationship) {
      if (typeof (policiesStore as any).setPayPolicy === "function") {
        (policiesStore as any).setPayPolicy(coopStore.policy.relationship);
      } else if (policiesStore.payPolicy) {
        policiesStore.payPolicy.relationship = coopStore.policy.relationship;
      }
      if (membersStore.payPolicy) {
        membersStore.payPolicy.relationship = coopStore.policy
          .relationship as any;
      }
    }

    // Reset flag after sync completes
    nextTick(() => {
      isSyncing = false;
    });
  };

  // Sync Legacy Stores -> CoopBuilder
  const syncFromLegacyStores = () => {
    if (isSyncing) return;
    isSyncing = true;
    // Sync streams from legacy store
    streamsStore.streams.forEach((stream: any) => {
      coopStore.upsertStream({
        id: stream.id,
        label: stream.name,
        monthly: stream.targetMonthlyAmount,
        category: stream.category,
        certainty: stream.certainty,
      });
    });

    // Sync members from legacy store
    membersStore.members.forEach((member: any) => {
      coopStore.upsertMember({
        id: member.id,
        name: member.displayName,
        role: member.role,
        hoursPerMonth: Number(((member.hoursPerWeek || 0) * 4.33).toFixed(2)),
        minMonthlyNeeds: member.minMonthlyNeeds,
        monthlyPayPlanned: member.monthlyPayPlanned,
        targetMonthlyPay: member.targetMonthlyPay,
        externalMonthlyIncome: member.externalMonthlyIncome,
      });
    });

    // Sync policies from legacy store
    if (policiesStore.isValid) {
      coopStore.setEqualWage(policiesStore.equalHourlyWage);
      coopStore.setOncostPct(policiesStore.payrollOncostPct);
      coopStore.savingsTargetMonths = policiesStore.savingsTargetMonths;
      coopStore.minCashCushion = policiesStore.minCashCushionAmount;
      if (policiesStore.payPolicy?.relationship) {
        coopStore.setPolicy(policiesStore.payPolicy.relationship as any);
        // Keep members store aligned with legacy policy
        if (membersStore.payPolicy) {
          membersStore.payPolicy.relationship = policiesStore.payPolicy
            .relationship as any;
        }
      }
    }
    // Also consider members store policy as a source of truth if set
    if (membersStore.payPolicy?.relationship) {
      coopStore.setPolicy(membersStore.payPolicy.relationship as any);
      if (typeof (policiesStore as any).setPayPolicy === "function") {
        (policiesStore as any).setPayPolicy(
          membersStore.payPolicy.relationship as any
        );
      } else if (policiesStore.payPolicy) {
        policiesStore.payPolicy.relationship = membersStore.payPolicy
          .relationship as any;
      }
    }

    // Reset flag after sync completes
    nextTick(() => {
      isSyncing = false;
    });
  };

  // Watch for changes in CoopBuilder and sync to legacy stores
  const setupCoopBuilderWatchers = () => {
    // Watch streams changes
    watch(
      () => coopStore.streams,
      () => {
        if (!isSyncing) {
          syncToLegacyStores();
        }
      },
      { deep: true }
    );

    // Watch members changes
    watch(
      () => coopStore.members,
      () => {
        if (!isSyncing) {
          syncToLegacyStores();
        }
      },
      { deep: true }
    );

    // Watch policy changes
    watch(
      () => [
        coopStore.equalHourlyWage,
        coopStore.payrollOncostPct,
        coopStore.savingsTargetMonths,
        coopStore.minCashCushion,
        coopStore.currency,
        coopStore.policy.relationship,
      ],
      () => {
        if (!isSyncing) {
          syncToLegacyStores();
        }
      }
    );
  };

  // Watch for changes in legacy stores and sync to CoopBuilder
  const setupLegacyStoreWatchers = () => {
    // Watch streams store changes
    watch(
      () => streamsStore.streams,
      () => {
        if (!isSyncing) {
          syncFromLegacyStores();
        }
      },
      { deep: true }
    );

    // Watch members store changes
    watch(
      () => membersStore.members,
      () => {
        if (!isSyncing) {
          syncFromLegacyStores();
        }
      },
      { deep: true }
    );

    // Watch policies store changes
    watch(
      () => [
        policiesStore.equalHourlyWage,
        policiesStore.payrollOncostPct,
        policiesStore.savingsTargetMonths,
        policiesStore.minCashCushionAmount,
        policiesStore.payPolicy?.relationship,
        membersStore.payPolicy?.relationship,
      ],
      () => {
        if (!isSyncing) {
          syncFromLegacyStores();
        }
      }
    );
  };

  // Initialize synchronization
  const initSync = async () => {
    // Wait for next tick to ensure stores are mounted
    await nextTick();

    // Force store hydration by accessing $state
    if (coopStore.$state) {
      console.log("🔄 CoopBuilder store hydrated");
    }

    // Small delay to ensure localStorage is loaded
    await new Promise((resolve) => setTimeout(resolve, 10));

    // Determine which store has data and sync accordingly
    const coopHasData =
      coopStore.members.length > 0 || coopStore.streams.length > 0;
    const legacyHasData =
      streamsStore.streams.length > 0 || membersStore.members.length > 0;

    console.log(
      "🔄 InitSync: CoopBuilder data:",
      coopHasData,
      "Legacy data:",
      legacyHasData
    );
    console.log(
      "🔄 CoopBuilder members:",
      coopStore.members.length,
      "streams:",
      coopStore.streams.length
    );
    console.log(
      "🔄 Legacy members:",
      membersStore.members.length,
      "streams:",
      streamsStore.streams.length
    );

    if (coopHasData && !legacyHasData) {
      console.log("🔄 Syncing CoopBuilder → Legacy");
      syncToLegacyStores();
    } else if (legacyHasData && !coopHasData) {
      console.log("🔄 Syncing Legacy → CoopBuilder");
      syncFromLegacyStores();
    } else if (coopHasData && legacyHasData) {
      console.log("🔄 Both have data, keeping in sync");
      // Both have data, ensure consistency by syncing from CoopBuilder (primary source)
      syncToLegacyStores();
    } else {
      console.log("🔄 No data in either store");
    }

    // Set up watchers for ongoing sync (only once)
    if (!watchersSetup) {
      setupCoopBuilderWatchers();
      setupLegacyStoreWatchers();
      watchersSetup = true;
    }

    // Return promise to allow awaiting
    return Promise.resolve();
  };

  // Get unified streams data (prioritize CoopBuilder) - make reactive
  const unifiedStreams = computed(() => {
    if (coopStore.streams.length > 0) {
      return coopStore.streams.map((stream) => ({
        ...stream,
        name: stream.label,
        targetMonthlyAmount: stream.monthly,
      }));
    }
    return streamsStore.streams;
  });

  // Get unified members data (prioritize CoopBuilder) - make reactive
  const unifiedMembers = computed(() => {
    if (coopStore.members.length > 0) {
      return coopStore.members.map((member) => ({
        ...member,
        displayName: member.name,
        hoursPerWeek: Number(((member.hoursPerMonth || 0) / 4.33).toFixed(2)),
      }));
    }
    return membersStore.members;
  });

  // Getter functions for backward compatibility
  const getStreams = () => unifiedStreams.value;
  const getMembers = () => unifiedMembers.value;

  return {
    syncToLegacyStores,
    syncFromLegacyStores,
    initSync,
    getStreams,
    getMembers,
    unifiedStreams,
    unifiedMembers,
  };
};