// ============================================================================
// Demo API - Mock responses for demo mode
// ============================================================================

import type {
  PaginatedResponse,
  Workspace,
  Project,
  Channel,
  Creative,
  Placement,
  PurchasePlanChannel,
  WorkspaceMember,
  SpendingAnalytics,
  CreativeAnalyticsItem,
  ChannelAnalyticsItem,
} from "@/lib/types/api";
import {
  demoWorkspace,
  demoMember,
  demoProjects,
  demoChannels,
  demoCreatives,
  demoPlacements,
  demoPurchasePlanChannels,
  demoSpendingAnalytics,
  demoCreativeAnalytics,
  demoChannelAnalytics,
} from "./mock-data";
import { DEMO_USER } from "./constants";

// ============================================================================
// Helper to create paginated response
// ============================================================================

const paginate = <T>(items: T[], page = 1, size = 50): PaginatedResponse<T> => ({
  items: items.slice((page - 1) * size, page * size),
  total: items.length,
  page,
  size,
  pages: Math.ceil(items.length / size),
});

// ============================================================================
// Demo API Methods
// ============================================================================

export const demoApi = {
  // Auth
  auth: {
    me: () => Promise.resolve(DEMO_USER),
  },

  // Workspaces
  workspaces: {
    list: () => Promise.resolve(paginate([demoWorkspace])),
    get: () => Promise.resolve(demoWorkspace),
  },

  // Members
  members: {
    list: () => Promise.resolve(paginate([demoMember])),
  },

  // Projects
  projects: {
    list: (params?: { project_id?: string }) => {
      let items = demoProjects;
      if (params?.project_id) {
        items = items.filter((p) => p.id === params.project_id);
      }
      return Promise.resolve(paginate(items));
    },
  },

  // Channels
  channels: {
    list: () => Promise.resolve(paginate(demoChannels)),
  },

  // Creatives
  creatives: {
    list: (params?: { project_id?: string; include_archived?: boolean }) => {
      let items = demoCreatives;
      if (params?.project_id) {
        items = items.filter((c) => c.project_id === params.project_id);
      }
      if (!params?.include_archived) {
        items = items.filter((c) => c.status === "active");
      }
      return Promise.resolve(paginate(items));
    },
    get: (id: string) => {
      const creative = demoCreatives.find((c) => c.id === id);
      if (!creative) throw new Error("Creative not found");
      return Promise.resolve(creative);
    },
  },

  // Placements
  placements: {
    list: (params?: {
      project_id?: string;
      placement_channel_id?: string;
      creative_id?: string;
      include_archived?: boolean;
    }) => {
      let items = demoPlacements;
      if (params?.project_id) {
        items = items.filter((p) => p.project_id === params.project_id);
      }
      if (params?.placement_channel_id) {
        items = items.filter(
          (p) => p.placement_channel_id === params.placement_channel_id
        );
      }
      if (params?.creative_id) {
        items = items.filter((p) => p.creative_id === params.creative_id);
      }
      if (!params?.include_archived) {
        items = items.filter((p) => p.status === "active");
      }
      return Promise.resolve(paginate(items));
    },
    get: (id: string) => {
      const placement = demoPlacements.find((p) => p.id === id);
      if (!placement) throw new Error("Placement not found");
      return Promise.resolve(placement);
    },
  },

  // Purchase Plan
  purchasePlan: {
    list: (projectId: string) => {
      const items = demoPurchasePlanChannels[projectId] || [];
      return Promise.resolve(paginate(items));
    },
  },

  // Analytics
  analytics: {
    spending: (params?: { project_id?: string; grouping?: string }) => {
      // Filter by project if specified
      if (params?.project_id) {
        const projectPlacements = demoPlacements.filter(
          (p) => p.project_id === params.project_id && p.status === "active"
        );
        const totalCost = projectPlacements.reduce(
          (sum, p) => sum + (p.cost || 0),
          0
        );
        const totalSubs = projectPlacements.reduce(
          (sum, p) => sum + (p.subscriptions_count || 0),
          0
        );
        const totalViews = projectPlacements.reduce(
          (sum, p) => sum + (p.views_count || 0),
          0
        );

        return Promise.resolve({
          total_cost: totalCost,
          total_subscriptions: totalSubs,
          total_views: totalViews,
          avg_cpf: totalSubs > 0 ? totalCost / totalSubs : null,
          avg_cpm: totalViews > 0 ? (totalCost / totalViews) * 1000 : null,
          chart_data: demoSpendingAnalytics.chart_data.slice(0, 3),
        } as SpendingAnalytics);
      }
      return Promise.resolve(demoSpendingAnalytics);
    },
    creatives: (params?: { project_id?: string }) => {
      let items = demoCreativeAnalytics;
      if (params?.project_id) {
        const projectCreativeIds = demoCreatives
          .filter((c) => c.project_id === params.project_id)
          .map((c) => c.id);
        items = items.filter((a) => projectCreativeIds.includes(a.id));
      }
      return Promise.resolve(paginate(items));
    },
    channels: (params?: { project_id?: string }) => {
      let items = demoChannelAnalytics;
      if (params?.project_id) {
        const projectPlacementChannelIds = new Set(
          demoPlacements
            .filter((p) => p.project_id === params.project_id)
            .map((p) => p.placement_channel_id)
        );
        items = items.filter((a) => projectPlacementChannelIds.has(a.channel_id));
      }
      return Promise.resolve(paginate(items));
    },
  },
};