import { DataTypes, Model, Optional } from 'sequelize';
import { sequelize } from '@config/database';
import { WorkflowRequest } from './WorkflowRequest';
import { ApprovalLevel } from './ApprovalLevel';
import { User } from './User';

export enum SnapshotType {
  PROPOSAL = 'PROPOSAL',
  COMPLETION = 'COMPLETION',
  INTERNAL_ORDER = 'INTERNAL_ORDER',
  WORKFLOW = 'WORKFLOW',
  APPROVE = 'APPROVE'
}

// Type definitions for snapshot data structures
export interface ProposalSnapshotData {
  documentUrl?: string;
  totalBudget?: number;
  comments?: string;
  expectedCompletionDate?: string;
  costItems?: Array<{
    description: string;
    amount: number;
    order: number;
  }>;
}

export interface CompletionSnapshotData {
  documentUrl?: string;
  totalExpenses?: number;
  comments?: string;
  expenses?: Array<{
    description: string;
    amount: number;
  }>;
}

export interface IOSnapshotData {
  ioNumber?: string;
  blockedAmount?: number;
  availableBalance?: number;
  remainingBalance?: number;
  sapDocumentNumber?: string;
}

export interface WorkflowSnapshotData {
  status?: string;
  currentLevel?: number;
}

export interface ApprovalSnapshotData {
  action: 'APPROVE' | 'REJECT';
  comments?: string;
  rejectionReason?: string;
  approverName?: string;
  approverEmail?: string;
  levelName?: string;
}

interface DealerClaimHistoryAttributes {
    historyId: string;
    requestId: string;
    approvalLevelId?: string;
    levelNumber?: number;
    levelName?: string;
    version: number;
    snapshotType: SnapshotType;
    snapshotData: ProposalSnapshotData | CompletionSnapshotData | IOSnapshotData | WorkflowSnapshotData | ApprovalSnapshotData | any;
    changeReason?: string;
    changedBy: string;
    createdAt: Date;
}

interface DealerClaimHistoryCreationAttributes extends Optional<DealerClaimHistoryAttributes, 'historyId' | 'approvalLevelId' | 'levelNumber' | 'levelName' | 'changeReason' | 'createdAt'> { }

class DealerClaimHistory extends Model<DealerClaimHistoryAttributes, DealerClaimHistoryCreationAttributes> implements DealerClaimHistoryAttributes {
    public historyId!: string;
    public requestId!: string;
    public approvalLevelId?: string;
    public levelNumber?: number;
    public version!: number;
    public snapshotType!: SnapshotType;
    public snapshotData!: ProposalSnapshotData | CompletionSnapshotData | IOSnapshotData | WorkflowSnapshotData | any;
    public changeReason?: string;
    public changedBy!: string;
    public createdAt!: Date;
}

DealerClaimHistory.init(
    {
        historyId: {
            type: DataTypes.UUID,
            defaultValue: DataTypes.UUIDV4,
            primaryKey: true,
            field: 'history_id'
        },
        requestId: {
            type: DataTypes.UUID,
            allowNull: false,
            field: 'request_id',
            references: {
                model: 'workflow_requests',
                key: 'request_id'
            }
        },
        approvalLevelId: {
            type: DataTypes.UUID,
            allowNull: true,
            field: 'approval_level_id',
            references: {
                model: 'approval_levels',
                key: 'level_id'
            }
        },
        levelNumber: {
            type: DataTypes.INTEGER,
            allowNull: true,
            field: 'level_number'
        },
        levelName: {
            type: DataTypes.STRING(255),
            allowNull: true,
            field: 'level_name'
        },
        version: {
            type: DataTypes.INTEGER,
            allowNull: false
        },
        snapshotType: {
            type: DataTypes.ENUM('PROPOSAL', 'COMPLETION', 'INTERNAL_ORDER', 'WORKFLOW', 'APPROVE'),
            allowNull: false,
            field: 'snapshot_type'
        },
        snapshotData: {
            type: DataTypes.JSONB,
            allowNull: false,
            field: 'snapshot_data'
        },
        changeReason: {
            type: DataTypes.TEXT,
            allowNull: true,
            field: 'change_reason'
        },
        changedBy: {
            type: DataTypes.UUID,
            allowNull: false,
            field: 'changed_by',
            references: {
                model: 'users',
                key: 'user_id'
            }
        },
        createdAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
            field: 'created_at'
        }
    },
    {
        sequelize,
        modelName: 'DealerClaimHistory',
        tableName: 'dealer_claim_history',
        timestamps: false,
        indexes: [
            {
                fields: ['request_id', 'level_number', 'version'],
                name: 'idx_history_request_level_version'
            },
            {
                fields: ['approval_level_id', 'version'],
                name: 'idx_history_level_version'
            },
            {
                fields: ['request_id', 'snapshot_type'],
                name: 'idx_history_request_type'
            },
            {
                fields: ['snapshot_type', 'level_number'],
                name: 'idx_history_type_level'
            }
        ]
    }
);

DealerClaimHistory.belongsTo(WorkflowRequest, { foreignKey: 'requestId' });
DealerClaimHistory.belongsTo(ApprovalLevel, { foreignKey: 'approvalLevelId' });
DealerClaimHistory.belongsTo(User, { as: 'changer', foreignKey: 'changedBy' });

export { DealerClaimHistory };